JP2002322514A - Granulating agent for iron making and granulating method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a granulating agent for iron making and a granulating method using the same, which are preferably used for granulating and pseudo-granulating or pelletizing by adjusting the water content of a raw material for iron making. provide. SOLUTION: As a granulating agent for iron making, for example, an aqueous solution containing a carboxyl group and / or a salt thereof and a polymer compound having a polyethylene glycol chain is used as a raw material for iron making containing fine iron ore (sintering raw material or pellet raw material). ) Is subjected to a granulation treatment (pseudo-granulation or pelletization).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a method for producing sintered ore or a method for producing pellets as a raw material for iron making,
When granulating a raw material for ironmaking, a granulating agent for ironmaking which is preferably used for granulating and quasi-granulating or pelletizing, particularly by adjusting the moisture of the raw material for ironmaking, and a granulating treatment using the same It is about the method.

[0002]

2. Description of the Related Art In the production of sinter ore, first, iron ore, auxiliary material, fuel, etc., which are sintering raw materials, are mixed and adjusted with a granulator such as a drum mixer, a pelletizer, an Erich mixer and the like. Granulate to produce pseudo particles. The pseudo particle is generally a particle in which fine particles of 0.5 mm or less adhere to core particles of 1 to 3 mm. At this time, the action required for the granulation is to improve the pseudo-granulation property in which the fine powder particles adhere around the core particles, and that the pseudo particles hardly collapse in a wet zone, a dry zone, etc. in the sintering process. is there. By making the sintering raw material into pseudo particles in this way, the permeability in the sintering material packed layer (sintering bed) on the sintering machine can be improved, and the productivity of the sintering machine can be improved. .

A sintering machine for sintering a sintering raw material employs a downward suction type, in which air necessary for sintering is circulated by sucking from the lower side of the sintering raw material and the upper side of the sintering raw material. By burning the fuel from below to below, the sintering raw material is sintered. For this reason, if the sintering raw material contains a large amount of fine powder, the air permeability decreases due to clogging and the like, and the burning rate of coke as fuel decreases, so that the production efficiency of the sintering machine decreases. Therefore, in order to improve the air permeability, it is necessary to perform a preliminary treatment such as granulation (pseudo-granulation) of the sintering raw material. As the pretreatment, for example, a granulation operation such as adding a small amount of water to the sintering raw material and stirring the mixture is performed. However, in the granulation operation using only water, the effect of improving the pseudo-granulation property is poor, so that the amount of the fine powder contained in the sintering raw material cannot be reduced much.

[0004] For this purpose, a method of adding various granulating additives as a binder to a sintering raw material has conventionally been proposed as a measure for improving pseudo-granulation properties. Many are known as granulation additives. For example, bentonite, lignin sulfite (pulp waste liquor), starch,
The use of sugar, molasses, water glass, cement, gelatin, corn starch and the like as a binder or a thickener has been studied. These are not industrially used in the production of sintered ore because of their relatively large amounts of addition and high cost, and the difficulty in securing the amount to be used.

[0005] As a granulating additive that is currently in practical use, for example, quicklime disclosed widely in Ironmaking Research No. 288 (1976), page 9 is widely used. According to this, the effect of quicklime is shown as follows. First, pseudo-granulation in the mixer can be promoted. Secondly, the sintering raw material consisting of pseudo particles is filled to a specific height, the sintering process after igniting the surface layer after forming a sintering bed, the pseudo particles collapse during drying and heating It is described that the uniform flow of air in the sintered layer can be maintained.

On the other hand, in the production of pellets, iron ore, dust, carbonaceous material, etc., which are raw materials, are mixed and then granulated with a granulator such as a pelletizer while adjusting the moisture content. 5. Pellets generally mean that particles of 1.0 mm or less are solidified.
Refers to spherical particles of 0 to 50 mm. At this time, the action required for the granulation is that the strength of the raw pellets before drying is high, and that the pellets are not broken down during the drying step or the transporting step and powdered. Conventionally, in order to improve the strength of pellets, 1% by weight or more of bentonite is added as a granulation additive to a fine powdery raw material and kneaded, and a granulating operation is performed while spraying an appropriate amount of water to produce pellets. A way to do that has been proposed. The pellets described herein are blast furnace raw materials, sintering raw materials, converter raw materials, and the like, and the production method and the like are not particularly limited.

[0007]

However, in the production of sintered ore, the use of a binder such as quicklime or molasses generally increases the production cost because it is expensive.
Further, although a granulation method using quick lime has been put to practical use, quick lime easily absorbs moisture and generates heat at this time. In addition, since the quick lime currently used cannot obtain a sufficient effect unless the amount of use is relatively large, the cost increases. Therefore, it is the current state of operation to reduce the amount of use as much as possible. And even if 2% by weight or more of quicklime is added, the effect of improving the pseudo-granularity tends to reach a peak. Furthermore, recently, as the lump ore is depleted, the ore fines are inferiorly deteriorated, and there is a problem that the granulation property of the sintering raw material is worse than before. For this reason, even if granulation is performed by adding quicklime, the effect is smaller than before. Furthermore, binders other than quicklime are insufficient in the effect of reducing the amount of fine powder contained in the sintering raw material,
The effect of improving the air permeability of the sintering bed to shorten the sintering time is small, and the sinter strength of the obtained sinter is weak. Sinter ore having a low sinter strength has a tendency to generate fine powder, for example, during crushing after sintering, so that the amount of returned ore increases, the product yield decreases, and the production efficiency decreases. For this reason, a granulation method using a binder other than quicklime has not been put to practical use.

Further, even when quick lime is used, the effect of reducing the amount of fine powder contained in the sintering raw material is not yet sufficient. On the other hand, there is a concept of using a binder other than quick lime and quick lime in combination, but known binders other than quick lime have an effect of reducing the amount of fine powder contained in the sintering raw material even when used in combination with quick lime. The tall ones are not known.

Therefore, it is excellent in the effect of improving the pseudo-granulation property, and can be used in combination with an inexpensive binder capable of improving the production efficiency of the sintering machine or with quick lime to further improve the pseudo-granulation property of quick lime. Binder, that is, a binder that can be suitably used for granulating the sintering raw material,
And a granulation method using the same is required.

On the other hand, when bentonite is used in the production of pellets, a large amount of water must be added during granulation due to its high swellability. For this reason, the raw pellets tend to be deformed because they are soft, so that the gas permeability during the drying step is deteriorated, and there is a problem that it takes a long time to perform sufficient drying and the strength is reduced. Furthermore, bentonite contains a large amount of impurity components such as silicon, which causes problems such as an increase in slag in hot metal and molten steel.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide an inexpensive granulating agent for steelmaking which is suitably used for granulating ironmaking raw materials, and a method for using the same. To provide a granulation method.

[0012]

Means for Solving the Problems The granulating agent for steelmaking of the present invention is a treating agent used for granulating ironmaking raw materials containing fine iron ore to solve the above-mentioned problems. A polymer compound having an acid group and a polyalkylene glycol chain, β-naphthalene sulfonate formalin condensate, melamine sulfonate formalin condensate, aromatic aminosulfonic acid polymer, ligninsulfonic acid modified product, It is characterized by containing at least one selected high molecular compound.

[0013] In order to solve the above-mentioned problems, the present invention provides a granulating treatment agent for ironmaking, which is used for granulating ironmaking raw materials containing fine iron ore, and comprises an acid group and a polyamine. It is characterized by containing a polymer compound having an alkylene glycol chain.

In order to solve the above-mentioned problems, the granulating agent for steelmaking of the present invention is characterized in that the acid group of the polymer compound is a carboxyl group and / or a salt thereof.

In order to solve the above-mentioned problems, the granulating agent for steelmaking according to the present invention is characterized in that the polyalkylene glycol chain of the polymer compound contains a structural unit derived from polyethylene glycol.

[0016] In order to solve the above-mentioned problems, the present invention provides a method for granulating a raw material for iron making, wherein the granulating agent for iron making is added to the raw material for iron making. Features.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION A granulating agent for steelmaking according to the present invention is a treating agent used for granulating ironmaking raw materials (sintering raw materials or pellet raw materials) containing fine iron ore, (A) a polymer compound having an acid group and a polyalkylene glycol chain, (B) a β-naphthalene sulfonate formalin condensate, (C) a melamine sulfonate formalin condensate, (D) an aromatic aminosulfonic acid polymer,
(E) lignin sulfonic acid-modified product comprising at least one polymer compound selected from the group consisting of:
Further, the granulation method according to the present invention, the raw material for iron making,
For example, in a method of granulating by mixing, humidity control, etc., the above-mentioned granulating agent for iron making is added to the raw material for iron making.

The high molecular compounds listed in the above (A) to (E) have a high dispersing ability, and are characterized by being less susceptible to polyvalent metal ions than ordinary dispersants.

In the granulation of iron ore, these (A) to
The role of the polymer compound (E) is to disperse ultra-fine iron ore of the order of submicron in water for granulation, and the resulting iron ore dispersed water becomes a binder such as clay. It works as a microparticle to create pseudo-particles by connecting fine iron ore of micron order and millimeter order of iron ore. As a result, fine powder is reduced.
In addition, the polymer compounds (A) to (E) are not easily affected by polyvalent metal ions even when used in combination with a binder capable of generating calcium ions at a high concentration such as quicklime, so that a granulation effect is obtained. Is also unlikely to occur.

Among the polymer compounds (dispersants) used in the present invention, the polymer compound of the above (A), that is, the acid group of the polymer compound having an acid group and a polyalkylene glycol chain includes, for example, Carboxyl group-containing monomers such as (meth) acrylic acid, maleic acid, maleic anhydride, itaconic acid, crotonic acid; sulfo group-containing monomers such as vinyl sulfonic acid, styrene sulfonic acid, and sulfoethyl (meth) acrylate; 2- (meth) Contains an acid phosphate group such as acryloyloxyethyl acid phosphate, 2- (meth) acryloyloxypropyl acid phosphate, 2- (meth) acryloyloxy-3-chloropropyl acid phosphate, 2- (meth) acryloyloxyethyl phenyl phosphate, etc. monomer; At least one monomer selected from the group consisting of acid group-containing monomers such as phenylphenol and the like; and acid salt-containing monomers such as salts, and salts thereof, by polymerization (copolymerization) as one of the polymerization components (monomer components). , But is not particularly limited.

When a salt of an acid group-containing monomer is used as the above-mentioned monomer, the neutralizing base is not particularly limited, but may be an alkali metal ion such as a potassium ion or a sodium ion; Alkaline earth metal ions; ammonium; nitrogen-containing bases such as primary to quaternary amines; and the like.

The acid groups derived from the monomers exemplified above may contain only one kind, or may contain two or more kinds. Among the acid groups derived from these monomers, a carboxyl group and / or a salt thereof are preferable, and (meth)
It is more preferable to introduce one by polymerizing (copolymerizing) at least one monomer selected from the group consisting of acrylic acid, maleic acid, and salts thereof as one of the polymerization components.

The polyalkylene glycol chain of the polymer compound (A) can be introduced, for example, by polymerizing (copolymerizing) a monomer containing a polyalkylene glycol chain as one of the polymerization components.

Examples of the monomer for introducing a polyalkylene glycol chain into the polymer compound (A), that is, the monomer constituting the polyalkylene glycol chain of the polymer compound (A) include, for example, , The following general formula (1)

[0025]

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(Wherein R ¹ , R ² and R ³ each independently represent a hydrogen atom or an alkyl group having 1 to 3 carbon atoms,
Represents an OH group or a salt thereof, R ⁴ represents an alkylene group having 2 to ⁴ carbon atoms, R ⁵ represents a hydrogen atom, a —CH ₃ group or —
X represents a CH ₂ CH ₃ group, and X represents a —CH ₂ — group, —CH ₂ C
H ₂ —, —CH ₂ (CH ₃ ) CH—,> C ＝ O or —CONHCH ₂ —, wherein n is 5 or more and 300
A monomer represented by the following positive number):

Specific examples of the monomer represented by the general formula (1) include, for example, polyethylene glycol monomethacrylate, methoxypolyethylene glycol monomethacrylate, and methoxypolyethylene glycol monoacrylate. Alkylene glycol (meth) acrylate; polyalkylene glycol monoalkenyl ether monomer obtained by adding ethylene oxide to 3-methyl-3-buten-1-ol; polyethylene glycol monoethenyl obtained by adding ethylene oxide to allyl alcohol But not particularly limited to maleic anhydride, a maleic acid polyethylene glycol half ester obtained by adding polyethylene glycol to maleic anhydride, and the like. One or more of these polyalkylene glycol chain-containing monomers can be used. Among these polyalkylene glycol chain-containing monomers, a monomer having an average number of repeating units represented by n of 10 or more and 100 or less is preferable from the viewpoint of easy availability and improvement of pseudo-granulation property.

In introducing a polyalkylene glycol chain into the polymer compound (A), the polyalkylene glycol chain-containing monomer may not be copolymerized but may be introduced by post-reaction of the polyalkylene glycol. it can. For example, after copolymerizing maleic anhydride,
A half-esterified product obtained by adding a polyalkylene glycol corresponds to this.

That is, the polymer compound (A) according to the present invention is represented by the acid group-containing monomer and / or a salt thereof described above and a polyalkylene glycol chain-containing monomer, for example, the above-mentioned general formula (1). Or a salt thereof and a polyalkylene glycol chain-containing monomer by polymerizing (copolymerizing) a polymerization component (monomer component) containing It can be obtained by polymerizing (copolymerizing) a polymerization component (monomer component) containing the exemplified acid group-containing monomer and / or a salt thereof, and then subjecting the polyalkylene glycol chain-containing monomer to an addition reaction.

As for these polyalkylene glycol chains, those having higher hydrophilicity tend to have higher pseudo-granulation properties, such as polypropylene glycol polyethylene glycol block copolymers represented by the following general formula (2):

[0031]

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(Wherein, R ⁶ represents an alkyl group having 1 to 3 carbon atoms, and n represents a positive number of 5 or more and 300 or less), preferably containing a structural unit derived from polyethylene glycol. Among them, those containing a constitutional unit derived from polyethylene glycol having an average number of repeating units represented by n of 10 or more and 100 or less are easy to obtain and improve the pseudo-granulation property. More preferred.

When the polyalkylene glycol chain contains a constituent unit derived from polyethylene glycol, the proportion of the constituent unit derived from polyethylene glycol in the polyalkylene glycol chain is preferably at least 30 mol%, more preferably at least 50 mol%. Is more preferable,
It is more preferably at least 80 mol%, most preferably 100 mol%, that is, the polyalkylene glycol chain is a polyethylene glycol chain.

As described above, the average number of repeating units of the polyalkylene glycol is preferably 5 or more and 300 or less, more preferably 10 or more and 100 or less.
It is as follows. When the number of the repeating units is less than 5, the effect of the polyalkylene glycol cannot be sufficiently exerted, and the pseudo-granulation property is remarkably reduced when quicklime is used in combination. On the other hand, when the number of repeating units is larger than 300, the properties of the polyalkylene glycol become too strong, and the pseudo-granulation property does not differ from that of the polyalkylene glycol. For this reason, when quicklime is used together, there is a possibility that the effect of improving the pseudo-granulation property cannot be obtained.

When obtaining the polymer compound (A), another monomer which can be further copolymerized with the above monomer may be copolymerized, if necessary. That is, the polymer compound according to the present invention may contain, if necessary, other monomers copolymerizable with the above-mentioned monomers (hereinafter referred to as copolymerization) in addition to the above-mentioned monomers constituting the acid group and the polyalkylene glycol chain. (Hereinafter referred to as a "active monomer").

Specific examples of the copolymerizable monomer include (meth) acrylic acid such as methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, and the like. (Meth) acrylic acid alkyl ester, which is an esterified product with a monohydric alcohol of -18 to (meth) such as cyclohexyl (meth) acrylate
Hydroxy group-containing (meth) acrylic esters such as 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, and monoesters of (meth) acrylic acid and polypropylene glycol; Styrene such as styrene, vinyltoluene, α-methylstyrene, ethylvinylbenzene, chloromethylstyrene and derivatives thereof; (meth) acrylamide, N-methyl (meth)
Acrylamide, N-ethyl (meth) acrylamide,
(Meth) acrylamide such as N, N-dimethyl (meth) acrylamide and derivatives thereof; vinyl acetate;
(Meth) acrylonitrile; N-vinyl-2-pyrrolidone; base-containing monomers such as dimethylaminoethyl (meth) acrylate, dimethylaminoethyl (meth) acrylamide, dimethylaminopropyl (meth) acrylamide, vinylpyridine, vinylimidazole; Crosslinkable (meth) such as methylol (meth) acrylamide and N-butoxymethyl (meth) acrylamide
Acrylamide monomers: vinyltrimethoxysilane, vinyltriethoxysilane, γ- (meth) acryloylpropyltrimethoxysilane, vinyltris (2-
A silane monomer having a hydrolyzable group directly bonded to a silicon atom, such as methoxyethoxy) silane and allyltriethoxysilane; an epoxy group-containing monomer such as glycidyl (meth) acrylate and glycidyl ether (meth) acrylate; -Oxazoline group-containing monomers such as isopropenyl-2-oxazoline and 2-vinyl-2-oxazoline; aziridine group-containing monomers such as 2-aziridinylethyl (meth) acrylate and (meth) acryloylaziridine; vinyl fluoride, fluorine Halogen-containing monomers such as vinylidene chloride, vinyl chloride and vinylidene chloride; (meth) acrylic acid, ethylene glycol,
Diethylene glycol, propylene glycol, 1,3
-Butylene glycol, neopentyl glycol, 1,
Polyfunctional (meth) acrylic esters having a plurality of unsaturated groups in the molecule, such as esterified products with polyhydric alcohols such as 6-hexanediol, trimethylolpropane, pentaerythritol, and dipentaerythritol; methylenebis (meth) acrylamide Polyfunctional (meth) acrylamide having a plurality of unsaturated groups in the molecule; polyfunctional allyl compound having a plurality of unsaturated groups in the molecule, such as diallyl phthalate, diallyl maleate, diallyl fumarate; allyl (meth) Acrylate; divinylbenzene;
And the like, but are not particularly limited. One of these monomers may be used, if necessary,
Further, two or more types may be used.

Further, in addition to these monomers, a chain transfer agent can be used for the purpose of controlling the molecular weight.
Specific examples of the chain transfer agent include compounds having a high chain transfer coefficient such as mercapto group-containing compounds such as mercaptoethanol, mercaptopropionic acid, and t-dodecylmercaptan; carbon tetrachloride; isopropyl alcohol; toluene; No. One of these chain transfer agents may be used, if necessary, or two or more thereof may be used. The use amount of these chain transfer agents is not particularly limited, but is preferably in the range of 0.005 to 0.15 mol per 1 mol of the monomer, that is, the acid group-containing monomer and the monomer copolymerizable with the acid group-containing monomer. It is.

The proportion of the acid group in the polymer compound (A) is not particularly limited, but the lower limit is preferably 10 mol%, more preferably 20 mol%.
And the upper limit is preferably 90 mol%, more preferably 80 mol%.

On the other hand, the proportion of the polyalkylene glycol chain in the polymer compound (A) is not particularly limited, but the lower limit is preferably 10 mol%, more preferably 20 mol%. And the upper limit is preferably 90 mol%, more preferably 80 mol%.
It is.

In the case where the polymer compound (A) contains a structural unit derived from the copolymerizable monomer, when the polymer unit derived from the copolymerizable monomer occupies the polymer compound (A). The ratio is not particularly limited, but is preferably 50 mol% or less, more preferably 30 mol% or less.

As described above, the polymer compound (A) is a monomer that forms an acid group and a polyalkylene glycol chain, for example, each monomer (an acid group and a polyalkylene glycol chain) that forms an acid group and a polyalkylene glycol chain as described above. And the polyalkylene glycol chain can be easily obtained by polymerizing (copolymerizing) a monomer component (monomer composition) containing at least different monomers.

The method for producing the polymer compound, that is, the method for polymerizing the above monomer component is not particularly limited, and various conventionally known polymerization methods such as an oil-in-water emulsion polymerization method and a water-in-oil emulsion polymerization method can be used. Polymerization method, suspension polymerization method, dispersion polymerization method,
A precipitation polymerization method, a solution polymerization method, an aqueous solution polymerization method, a bulk polymerization method and the like can be employed. Among the polymerization methods exemplified above, an aqueous solution polymerization method is preferable from the viewpoint of reduction of polymerization cost (production cost) and safety.

The polymerization initiator used in the above polymerization method is as follows:
Any compound that is decomposed by heat or an oxidation-reduction reaction to generate a radical molecule may be used. When the aqueous solution polymerization method is employed, a polymerization initiator having water solubility is preferred. Specific examples of the polymerization initiator include persulfates such as sodium persulfate, potassium persulfate, and ammonium persulfate; 2,2′-azobis- (2-amidinopropane) dihydrochloride; '-Azobis- (4
Water-soluble azo compounds such as -cyanopentanoic acid); pyrolytic initiators such as hydrogen peroxide; hydrogen peroxide and ascorbic acid, t-butyl hydroperoxide and Rongalite, potassium and metal salts, ammonium persulfate and sulfurous acid A redox-based polymerization initiator comprising a combination of sodium hydrogen; and the like, but are not particularly limited. One of these polymerization initiators may be used alone, or two or more thereof may be used in combination. The amount of the polymerization initiator to be used may be appropriately set according to the composition of the monomer component, polymerization conditions, and the like.

The polymerization conditions such as the reaction temperature and the reaction time may be appropriately set according to the monomer components, that is, the composition of the monomer composition, the type of the polymerization initiator, and the like.
It is more preferable that the temperature is in the range of
More preferably, it is in the range of 95 ° C. The reaction time is preferably about 3 to 15 hours. As a method of supplying the monomer component to the reaction system when the aqueous solution polymerization method is employed, for example, a batch addition method, a split addition method, a component dropping method, a power feed method, a multi-stage dropping method, and the like can be performed. It is not limited.

In the production of the polymer compound (A),
The concentration of the non-volatile components including the polymer compound (A) in the polymer aqueous solution obtained when the aqueous solution polymerization method is employed is not particularly limited, but may be 60% by weight or less. preferable. A polymer aqueous solution having a non-volatile content of more than 60% by weight has too high a viscosity and may not be able to maintain dispersion stability to cause aggregation.

The weight average molecular weight of the polymer compound (A) is preferably 1,000 or more and 500,000 or less. The lower limit (weight average molecular weight) is 20
More preferably, the upper limit (weight average molecular weight) is 100,000. When the weight average molecular weight is less than 1000, the pseudo-granulation property tends to decrease. When the weight average molecular weight exceeds 500,000, the viscosity becomes too high, and the polymer compound of (A) does not sufficiently reach iron ore. However, there is a possibility that the pseudo-granulation property is reduced.

The polymer compound (A) is dissolved or swelled in water by neutralizing at least a part thereof with a basic neutralizing agent or as it is (without neutralization). I do. Thereby, the granulation treating agent for steelmaking according to the present invention using the polymer compound of the above (A) can exhibit sufficient performance (effect) with a small amount of use. Specific examples of the neutralizing agent include alkali metal hydroxides such as sodium hydroxide and potassium hydroxide; basic carbonates such as sodium carbonate, sodium hydrogen carbonate, ammonium carbonate and ammonium hydrogen carbonate; And a nitrogen-containing base such as ammonia water and monoethanolamine; and the like, but are not particularly limited thereto.

As described above, the polymer compound (A) used in the granulating agent for steelmaking according to the present invention is obtained. Even when the amount of the polymer compound (A) is considerably small, it is excellent in the effect of improving pseudo-granulation property when granulating a raw material for iron making, and can improve the production efficiency of a sintering machine. . In other words, the granulation agent for iron making containing the polymer compound (A) acts as a binder for granulating (pseudo-granulating or pelletizing) the raw material for iron making. Thereby, it is possible to provide an inexpensive granulating agent for ironmaking, which is suitably used for granulating a raw material for ironmaking to obtain a sintered ore.

Among the dispersants used in the present invention, the polymer compound (B), ie, the β-naphthalenesulfonate formalin condensate, is obtained by reacting concentrated sulfuric acid with naphthalene oil of coal tar fraction. And a sulfonated product is subjected to a condensation reaction with formaldehyde. For example, the following general formula (3)

[0050]

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(Where R⁷, R⁸Are each independently water
Elemental atom, -CH_ThreeGroup or -CH _TwoCH_ThreeRepresents a group, M
Is an alkali metal ion, an alkaline earth metal ion or
Represents a nitrogen-containing base, and p represents a positive number of 1 to 10,000
).

The component of the naphthalene oil used here is generally a mixture of naphthalene, thionaphthene, methylnaphthalene and the like in many cases. As the β-naphthalene sulfonate formalin condensate, a conventionally known β-naphthalene sulfonate formalin condensate, for example, a commercially available β-naphthalene sulfonate formalin condensate can be used. However, there is no particular limitation.

The melamine sulfonate formalin condensate, which is a polymer compound of the above (C), is a water-soluble polymer compound obtained by subjecting melamine to a condensation reaction with an aqueous formaldehyde solution and sulfonating it with sodium sulfite. General formula (4)

[0054]

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(Wherein, M represents an alkali metal ion, an alkaline earth metal ion or a nitrogen-containing base;
(Representing a positive number of 10,000). As the melamine sulfonate formalin condensate, a conventionally known melamine sulfonate formalin condensate, for example, a commercially available melamine sulfonate formalin condensate can be used, and the production conditions and the like are particularly limited. is not.

The aromatic aminosulfonic acid polymer which is the polymer compound (D) is a water-soluble polymer compound obtained by condensing aniline sulfonated aminobenzenesulfonic acid and phenol with formaldehyde.
For example, the following general formula (5)

[0057]

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(Wherein M represents an alkali metal ion, an alkaline earth metal ion or a nitrogen-containing base, and r and s each independently represent a positive number from 1 to 10000). are doing. As the aromatic aminosulfonic acid polymer, a conventionally known aromatic aminosulfonic acid polymer, for example, a commercially available aromatic aminosulfonic acid polymer can be used, and the production conditions and the like are not particularly limited.

Further, the ligninsulfonic acid-modified polymer (E), which is a polymer compound, is obtained by modifying ligninsulfonic acid obtained by treating concentrated pulp with concentrated sulfuric acid and complexing it with β-naphthalenesulfonic acid or the like. A polymer represented by the following general formula (6)

[0060]

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(Wherein, R ⁹ represents a group derived from β-naphthalene sulfonate formalin condensate or a —COOH group, M represents a metal ion, an alkaline earth metal ion or a nitrogen-containing base, and t represents 1 (Representing a positive number of 10000 to 10000). As the ligninsulfonic acid-modified product, a conventionally known ligninsulfonic acid-modified product, for example, a commercially available ligninsulfonic acid-modified product can be used, and the production conditions and the like are not particularly limited. The modified lignin sulfonic acid has better dispersibility than simple lignin sulfonic acid.

In the above general formulas (3) to (6), among the substituents represented by M, the alkali metal ions include
Specific examples include ions of alkali metals such as potassium and sodium. Further, specific examples of the alkaline earth metal ion include an ion of an alkaline earth metal such as calcium. Examples of the nitrogen-containing base include ammonium, primary to quaternary amine, and the like.

The weight average molecular weight of the polymer compounds (B) to (E) is preferably 1,000 or more and 500,000 or less. The lower limit (weight average molecular weight) is 2
More preferably, the upper limit value (weight average molecular weight) is 100,000. When the weight average molecular weight is less than 1000, the pseudo-granulation property tends to decrease, and when it exceeds 500,000, the viscosity becomes too high, and the polymer compound of (B) to (E) is added to iron ore. It may not be sufficiently rotated, and the pseudo-granulation property may be reduced.

The polymer compounds (B) to (E) are
Each of them is characterized by having a sulfonic acid group, and the function of the sulfonic acid group is a dispersant that is hardly affected by a polyvalent metal. The dispersion stabilizing mechanism of the polymer compound of (B) to (E) is slightly different from the dispersion stabilizing mechanism of the polymer compound of (A), and is stabilized by the electric repulsion of sulfonic acid ions.

On the other hand, the polymer compound (A), which has an acid group and a polyalkylene glycol chain, is stabilized by the steric effect of polyethylene glycol. According to the study by the present applicant, the polymer compound of the above (A) has higher pseudo-granulation property than the polymer compounds of the above (B) to (E) due to this difference in dispersion stabilization mechanism. Therefore, the polymer compound (A) is more suitable as a binder for iron ore granulation.

The content (ratio) of the polymer compound (A) to (E) contained in the granulating agent for iron making according to the present invention depends on the granulation properties of the ore (iron ore) as the sintering raw material. (type)
It may be appropriately set according to the type of the polymer compound (A) to (E), the granulator to be used, and the like, and is not particularly limited. The total addition ratio of the polymer compounds (A) to (E) in the granulating agent for iron making with respect to the binding raw material (iron ore, auxiliary raw material, fuel, etc.) (however, the above (A) to (E) The polymer compound of
(Only one kind may be used, or two or more kinds may be used in combination.)
Is preferably 0.001% by weight, more preferably 0.005% by weight, and the upper limit is preferably 2% by weight, more preferably 1% by weight. preferable. If the total addition ratio of the above-mentioned polymer compounds (A) to (E) to the sintering raw material exceeds 2% by weight, the addition amount of the granulating agent for iron making to the sintering raw material becomes too large, There is a possibility that a large agglomeration of the raw material is formed, and a problem such as that the inside of the agglomeration of the sintering raw material is not sintered.

On the other hand, the above (A) to
When the total addition ratio of the polymer compound (E) is less than 0.001% by weight, the performance of the polymer compound of the above (A) to (E), particularly, the fine powder of iron ore There is a possibility that the effect of improving quasi-granulation properties when used for granulation of a raw material for iron making containing iron may not be sufficiently exhibited.

In the production of pellets, the granules (A) to (A) contained in the granulating agent for steelmaking according to the present invention are used.
Although the ratio of the polymer compound of (E) is not particularly limited, the above-mentioned (A) to (E) in the above-mentioned granulation treatment agent for ironmaking with respect to pellet raw materials (iron ore, dust, carbonaceous material, etc.). The total addition ratio of the high molecular compounds (provided that the above (A) to
(E) The polymer compound may be used alone or in combination of two or more.)
It is preferably set to be 0.05% by weight, more preferably 0.01% by weight, and the upper limit is preferably 5% by weight, more preferably 1% by weight.
If the total addition ratio of the above-mentioned polymer compounds (A) to (E) to the pellet raw material exceeds 5% by weight, the amount of the granulation treatment agent for steelmaking added to the pellet raw material becomes too large, resulting in excessive granulation. As a result, a large mass of the pellet raw material is formed, which may cause an adverse effect such as an increase in the variation in the particle diameter of the pellet raw material.

The amount of the above-mentioned granulating agent for iron making to the sintering raw material (iron ore, auxiliary raw material, fuel, etc.) is not particularly limited, but the lower limit is preferably 0.005.
It is preferably set to 1% by weight, more preferably 0.005% by weight, and the upper limit is preferably 10.0% by weight, more preferably 8.0% by weight. When the addition ratio of the granulation treatment agent for iron making to the sintering raw material is within 10.0% by weight, the sintering raw material is hardly agglomerated, and the inside of the sintering raw material is not sintered. Is less likely to occur. In addition, the lower limit of the addition amount (addition ratio) of the granulating agent for iron making depends on the granulation properties of the ore as a sintering raw material, the amount of water added, the granulator used, and the like. It is desirable to design so that

Raw material for pellets (iron ore, dust, charcoal, etc.)
The addition amount of the above-mentioned granulating agent for iron making is not particularly limited, but the lower limit is preferably 0.01% by weight, more preferably 0.05% by weight, and the upper limit is preferably Is 50% by weight, more preferably 30% by weight. If the above-mentioned granulating agent for iron-making is added in excess of 50% by weight, the granulation becomes excessive and a large agglomeration of the pellet raw material is formed, which has an adverse effect such as a large variation in the particle diameter of the pellet raw material. I will. Also,
The lower limit of the amount of the granulating agent for iron making is determined by the granulation property of the pellet raw material, the amount of water added, the granulator to be used, etc., but it is desirable to design as small as possible. .

In other words, the above-mentioned granulating agent for iron making suppresses the viscosity of the granulating agent for iron making and maintains the dispersion stability depending on the viscosity of the polymer compound used, that is, the kind of the polymer compound used. For the purpose, if necessary, it may further contain a diluent such as water, and is obtained by the above aqueous solution polymerization method by separately adding water and the like to the above-mentioned sintering raw material or ironmaking raw material such as pellet raw material. Or a polymer aqueous solution containing the polymer compound of (A) or (A) to (E).
May be used as the granulating agent for iron making according to the present invention.

Therefore, the content (ratio) of the polymer compound (A) to (E) contained in the granulating agent for iron making according to the present invention depends on the production of ore (iron ore) as a sintering raw material. It may be appropriately set according to the granularity (kind), the type of the polymer compound (A) to (E), the granulator to be used, and the like, and is not particularly limited. When water or the like is separately added, the content is preferably 50% by weight or more.
% By weight or more, more preferably 100% by weight,
That is, the above-mentioned granulation treatment agent for iron-making includes the above-mentioned (A) to
It is particularly preferred that it be at least one selected from the group consisting of the polymer compounds of (E).

When the granulating agent for iron making contains water, the above (A) to (E) in the granulating agent for iron making may be used.
The content (ratio) of the high molecular compound may be set so as to satisfy the above-mentioned conditions, and is not particularly limited, but is preferably 0.1% by weight or more and 80% by weight or less, It is more preferably from 0.5% by weight to 70% by weight, and particularly preferably from 1% by weight to 60% by weight.

When two or more polymer compounds selected from the group consisting of the polymer compounds (A) to (E) are used in combination, the blending ratio of each polymer compound is not particularly limited. .

Further, the above-mentioned granulating agent for iron-making is used for the performance of the above-mentioned polymer compounds (A) to (E), especially for granulating iron-making raw materials containing fine iron ore. Within the range that does not inhibit the effect of improving the pseudo-granulation property when used, or in order to further improve the pseudo-granulation property, if necessary, other components, for example, other conventionally known granulations such as quicklime, etc. Additives and the like may be used in combination.

The polymer compounds (A) to (E) are hardly affected by polyvalent metal ions, so that the granulation effect is hardly reduced. Although the amount of fine powder to be produced can be sufficiently reduced, quick lime is expensive and requires careful handling. Therefore, the raw material for iron making is manufactured using the granulating agent for iron making according to the present invention. When performing the granulation treatment, it is preferable to perform the granulation treatment in the absence of quick lime, and no quick lime is added at all, or even if it is added, it is added so as to be 0.1% by weight or less based on the iron ore. Is preferred. Conventionally,
In the granulation of iron ore, it is common to use quick lime, and even when using a binder other than quick lime, there is a concept of using it together with quick lime.However, the granulating agent for iron making includes quick lime. It is more effective not to use it in combination with quick lime in improving the pseudo-granulation property in the granulation of the raw material for iron making. Therefore, when the iron-making granulation treatment agent contains quicklime, the proportion of quicklime in the ironmaking granulation treatment agent is determined by adding the quicklime to the iron ore when the ironmaking granulation treatment agent is added to iron ore. The ratio is 0.
Preferably, it is set to be 1% by weight or less. It should be noted that no known binder other than quicklime has a high effect of reducing the amount of fine powder contained in the sintering raw material even when used in combination with quicklime.

The polymer compounds (A) to (E) according to the present invention are excellent in the effect of improving the pseudo-granulation property when granulating a raw material for iron making, even if the amount of use is considerably small. In addition, the production efficiency of the sintering machine can be improved. That is, the above-mentioned granulating agent for iron making acts as a binder for granulating (pseudo-granulating or pelletizing) the raw material for iron making. Thereby, it is possible to provide an inexpensive granulating agent for ironmaking, which is suitably used for granulating a raw material for ironmaking to obtain a sintered ore.

In particular, even when the amount of the granulating agent for iron making is 0.1% by weight or less based on the iron ore, the GI index of the iron ore after granulating is 55%. That is all.

The method of adding the granulating agent for iron making to the raw material for iron making is not particularly limited, but the granulating agent for iron making is made into an aqueous solution and mixed with the added water of the granulator. Particularly preferred is a method or a method of spraying agitated raw materials for steelmaking. By adopting these methods, the above-mentioned granulating agent for iron-making can be simply and uniformly added, and pseudo-granulation can be achieved without unevenness, so that fine powder can be further reduced.

Further, according to the particle size distribution, granulation properties, composition, etc. of each brand of the iron making raw material including the auxiliary raw material, fuel, etc., a part of the iron making raw material is mixed, kneaded, granulated, and then mixed. Regarding the treatment method of mixing and granulating the remaining raw materials for ironmaking, pseudo-granulation can be performed by adding the granulating agent for ironmaking according to the present invention to the raw materials for ironmaking. For example, in the case where a part of the raw material for ironmaking shows difficult granulation, pseudo-granulation can be performed by adding a granulating agent for ironmaking to the raw material for ironmaking which is difficult to granulate. Therefore, the raw material for ironmaking can be efficiently granulated with a small amount of the granulating agent for ironmaking.

As described above, the granulating agent for steelmaking according to the present invention can freely select a combination of a raw material for a steelmaking, a granulating machine, a timing and a place to be added, and the combination is particularly suitable. It is not limited. In other words, having a plurality of processing steps, also for the granulation treatment method for combining the granulation treatment agent for ironmaking and each treatment method, by adding the granulation treatment agent for ironmaking according to the present invention to the raw material for ironmaking, It can be pseudo-granulated. Of course, the granulating agent for steelmaking according to the present invention can be used for a known pseudo-granulation method (means).

As described above, the granulation method of the present invention
The granulating agent for ironmaking according to the present invention, that is, the granulating agent for ironmaking is added to the raw material for ironmaking, whereby the raw material for ironmaking containing fine iron ore to obtain sintered ore ( It is possible to provide a granulation method suitable for granulating (pseudo-granulation or pelletization) the sintering raw material or the pellet raw material.

Further, the method for granulating iron raw material of the present invention is preferably such that the above-mentioned granulating agent for iron manufacturing is added in the form of an aqueous solution, as described above.
When granulating (pseudo-granulating or pelletizing) raw materials for iron making (fine sintering or pelletizing raw materials) containing fine iron ore, the effect of reducing the amount of fines is excellent, and the production efficiency of the sintering machine is improved. It is possible to provide a granulation method that can be further improved.

Further, in the method for granulating iron raw material according to the present invention, as described above, the above-mentioned granulating agent for iron manufacturing is added in the range of 0.001% by weight to 50% by weight based on the iron raw material. It is preferable that the amount of fine powder is reduced when a raw material for iron making (sintering raw material or pellet raw material) containing fine iron ore is subjected to granulation treatment (pseudo-granulation or pelletization). It is possible to provide a granulation method which is more excellent in the effect of the sintering and can further improve the production efficiency of the sintering machine.

Further, as described above, the method for granulating iron raw material of the present invention may include a plurality of processing steps, and may be configured to combine the above-mentioned granulating agent for iron manufacturing with each processing method. Preferably, when the ironmaking raw material (sintering raw material or pellet raw material) containing fine iron ore is subjected to granulation treatment (pseudo-granulation or pelletization), the effect of reducing the amount of fine powder is further improved. It is possible to provide a granulation method capable of further improving the production efficiency of knots.

[0086]

The present invention will be described in more detail with reference to the following Examples and Comparative Examples, but the present invention is not limited thereto. The average particle size and GI index in Examples and Comparative Examples were measured by the following methods.
In the Examples and Comparative Examples, “parts” indicates “parts by weight”, and “%” indicates “% by weight”.

(Average particle size of pseudo particles, GI index) The pseudo particles obtained by performing the granulation operation were dried at 80 ° C for 1 hour.
The particles were classified using a sieve to determine the particle size (pseudo particle size) and the average particle size. G of granulated pseudo particles
The I index is one of the evaluation methods disclosed in Iron and Steel Research No. 288 (1976), page 9, and indicates the ratio of fine powder particles adhering around core particles. The measurement of the GI index was performed according to the method described in Iron and Steel Research No. 288 (1976), page 9. In the measurement of each of the following Examples and Comparative Examples, the GI index of pseudo particles having a particle size of 0.5 mm or less after granulation was determined. Further, the GI index (pseudo-granulation index) of the pseudo particles having a size of 0.5 mm or less was calculated by the following equation. GI index of pseudo particle of 0.5 mm or less = (0.
Ratio of raw material of 5 mm or less-Ratio of raw material of 0.5 mm or less after granulation) / (Ratio of raw material of 0.5 mm or less before granulation)
× 100 The sintering raw materials and pellet raw materials in the following Examples and Comparative Examples were all in a dry state.
The weight average molecular weight of the polymer in the aqueous polymer solution was measured by GPC (gel permeation chromatography) in terms of polyethylene glycol.

Example 1 A glass reactor equipped with a thermometer, a stirrer, a dropping funnel, a nitrogen inlet tube and a reflux condenser was charged with 1698 parts of ion-exchanged water, and the inside of the reactor was replaced with nitrogen under stirring. Then, it was heated to 80 ° C. under a nitrogen atmosphere. On the other hand, methoxypolyethylene glycol monomethacrylate (average number of moles of ethylene oxide = 2) as a polyalkylene glycol chain-containing monomer
5) 1668 parts, 332 parts of methacrylic acid as an acid group-containing monomer and 500 parts of ion-exchanged water are mixed, and 16.7 parts of mercaptopropionic acid as a chain transfer agent is further uniformly mixed with the mixture to obtain a monomer mixture. An aqueous solution was prepared.

Next, this monomer mixture aqueous solution and a 10% ammonium persulfate aqueous solution as a polymerization initiator were charged into a dropping funnel, respectively, and the monomer mixture aqueous solution and 184 parts of a 10% ammonium persulfate aqueous solution were combined with the ionized ion in the reaction vessel. It was added dropwise to the exchange water in 4 hours. After completion of the dropwise addition, 10% of the reaction solution in the reaction vessel is further added.
46 parts of an aqueous ammonium persulfate solution was added dropwise over 1 hour.
Thereafter, the temperature of the reaction solution in the reaction vessel was maintained at 80 ° C. for 1 hour, and the polymerization reaction was completed.

Thereafter, the reaction solution is neutralized with a 30% aqueous sodium hydroxide solution and contains the polymer compound (A).
The weight average molecular weight is 23,800 and the concentration of non-volatile components is 43.
A 2% aqueous polymer solution (a) was obtained. Next, water (5415 parts) was added to 85 parts of the obtained polymer aqueous solution (a), and the mixture was stirred well to obtain 5500 parts of a polymer aqueous solution (1) as a granulating agent for steelmaking. On the other hand, a sintering raw material (raw material for iron making) having the composition shown in Table 1 was prepared.

[0091]

[Table 1]

[0092] 70,000 parts of the above sintering raw material were
Into the sir, rotation speed 24min ^-1For 1 minute
Stirred. Then, while stirring at the same rotation speed,
The polymer aqueous solution (1) 5250 prepared in advance
The part was sprayed over about 1.5 minutes using a spray. Sintering
Ratio of polymer compound to raw material, that is, sintering raw material
The ratio of the polymer compound (A) to the
Was. After spraying, further stir at the same rotation speed for 3 minutes
To perform a granulation operation. Also, separately from this,
In addition to the polymer aqueous solution (1) as a raw material,
Parts (0.5%) were further added, and the same operation was performed.
The granulation operation of the lime combination system was performed.

The moisture contained in each of the obtained pseudo-particles was measured, and the granulated material was dried in an oven at 80 ° C. for 1 hour. After drying the pseudo-particles, the particles were classified using a sieve, thereby obtaining an average value. The particle size and GI index were determined. Table 2 summarizes the results.

Example 2 In a glass reaction vessel equipped with a thermometer, a stirrer, a dropping funnel, a nitrogen inlet tube and a reflux condenser, 1,291 parts of ion-exchanged water and a monomer containing a polyalkylene glycol chain were prepared. 3-methyl-3-
A reaction solution was prepared by charging 1812 parts of a polyalkylene glycol monoalkenyl ether monomer obtained by adding an average of 50 moles of ethylene oxide to buten-1-ol, and 188 parts of maleic anhydride as an acid group-containing monomer. Next, the reaction solution was heated to 60 ° C.

Subsequently, "NC-32W" (trade name; manufactured by Niho Chemical Co., Ltd., 2, 2) was added to the reaction solution as a polymerization initiator.
50 parts of a 15% aqueous solution of 2'-azobis-2-methylpropionamidine hydrochloride (87% concentration) was added, and the mixture was stirred for 7 hours. The temperature was further raised to 80 ° C, and the mixture was stirred for 1 hour to complete the polymerization reaction. I let it.

Thereafter, the reaction solution was neutralized with a 30% aqueous sodium hydroxide solution to contain the polymer compound (A).
The weight average molecular weight is 26200, and the concentration of non-volatile components is 55.
A 1% aqueous polymer solution (b) was obtained. Next, water 543 was added to 66.5 parts of the obtained polymer aqueous solution (b).
3.5 parts were added and stirred well to obtain 5500 parts of an aqueous polymer solution (2) as a granulating agent for iron making.

Thereafter, in Example 1, granulation was carried out by using the polymer aqueous solution (2) in place of the polymer aqueous solution (1) by the same operation as in Example 1, and included in each of the obtained pseudo particles. Measurement of moisture, average particle size and G
The I index was determined. Table 2 summarizes the results.

Example 3 "Mighty 150" which is a formalin condensate of β-naphthalenesulfonic acid as a polymer compound of (B) (trade name; Kao Corporation, nonvolatile content 40.1%) 91.4 To this part, 5408.6 parts of water was added and stirred well to obtain 5500 parts of a polymer aqueous solution (3) as a granulating agent for steelmaking.

Thereafter, in Example 1, granulation was carried out by using the polymer aqueous solution (3) in place of the polymer aqueous solution (1) by the same operation as in Example 1, and the resulting particles were included in the respective pseudo particles. Measurement of moisture, average particle size and G
The I index was determined. Table 2 summarizes the results.

[Example 4] "Merment F10" (trade name; powder product, manufactured by SKW) which is a melamine sulfonate formalin condensate as the polymer compound of (C)
7 parts were dissolved in 5463.3 parts of water to obtain 5500 parts of a polymer aqueous solution (4) as a granulating agent for iron making.

Thereafter, in Example 1, granulation was carried out by using the polymer aqueous solution (4) in place of the polymer aqueous solution (1) by the same operation as in Example 1, and included in each of the obtained pseudo particles. Measurement of moisture, average particle size and G
The I index was determined. Table 2 summarizes the results.

Comparative Example 1 Granulation was carried out in the same manner as in Example 1, except that 5250 parts of water was used instead of the aqueous polymer solution (1). That is, the granulation operation was performed by adding 5250 parts of water to 70000 parts of the same sintering raw material as in Example 1. Then, Example 1
By the same operation as described above, the measurement of the water content, the average particle size, and the GI index of the obtained pseudo particles were obtained. Table 2 summarizes the results.

Comparative Example 2 The same sintering raw material 70 as in Example 1
000 parts into a drum mixer, and quicklime 8
40 parts were added, and the mixture was preliminarily stirred at a rotation speed of 24 min ^-1 for 1 minute. Thereafter, 5600 parts of water was sprayed on the sintering raw material for about 1.5 minutes while spraying at the same rotation speed. After spraying, a granulation operation was performed by further stirring at the same rotation speed for 3 minutes. Next, by the same operation as in Example 1, the measurement of the water content, the average particle diameter, and the GI index of the obtained pseudo particles were obtained. Table 2 summarizes the results.

[Comparative Example 3] 36.7 parts of carboxymethyl cellulose (degree of etherification 0.9, molecular weight 22,000, powder product, trade name "CMC-2260") was added to water 5463.
The polymer was dissolved in 3 parts to obtain 5500 parts of a polymer aqueous solution (5) as a granulating agent for steelmaking.

Then, in Example 1, this polymer aqueous solution (5) was used in place of the polymer aqueous solution (1).
Using this aqueous polymer solution (5) and quicklime as the raw material for sintering, granulation of a quicklime combination system was performed in the same manner as in Example 1, and the measurement of the moisture contained in each of the obtained pseudo-particles, the average particle size And the GI index were determined. Table 2 summarizes the results.

[0106]

[Table 2]

As is clear from the results shown in Table 2, by using a small amount of the granulating agent for iron making according to the present invention,
The average particle diameter and the GI index of the pseudo particles can be greatly increased. In addition, even when quicklime was used in combination, stable pseudo-granulation was exhibited with little influence of quicklime. Therefore, it was found that the granulating agent for steelmaking exhibited an excellent effect of pseudo-granulating the sintering raw material.

Further, from the results, it was found that by using a small amount of the granulating agent for steelmaking according to the present invention, the production rate, product yield and sinter strength of a sintering machine formed by sintering pseudo particles were improved. It is presumed that it can be done. Sinter ore having a low sinter strength has a tendency to generate fine powder, so that the amount of ore returned increases, the product yield decreases, and the production efficiency decreases.

[0109]

As described above, the granulating agent for iron making according to the present invention comprises a polymer compound having an acid group and a polyalkylene glycol chain, a β-naphthalene sulfonate formalin condensate, and a melamine sulfonate formalin. The composition includes at least one polymer compound selected from the group consisting of a condensate, an aromatic aminosulfonic acid polymer, and a ligninsulfonic acid-modified product.

Further, the granulating agent for steelmaking according to the present invention has a structure containing a polymer compound having an acid group and a polyalkylene glycol chain as described above. The acid group contained in the polymer compound, that is, the polymer compound having an acid group and a polyalkylene glycol chain, is preferably a carboxyl group and / or a salt thereof. Further, the polyalkylene glycol chain preferably contains a structural unit derived from polyethylene glycol.

[0111] Each of the above-mentioned polymer compounds according to the present invention is used to granulate (pseudo-granulate or pelletize) a raw material for iron-making (sintering raw material or pellet raw material) containing fine iron ore to form fine powder particles. Excellent effect of attaching around core particles,
The production efficiency of the sintering machine can be improved,
There is an effect that the granulating agent for iron making can be provided at low cost.

The granulation method according to the present invention is, as described above, configured to add the above-mentioned granulating agent for steelmaking according to the present invention to the above-mentioned raw materials for ironmaking.

Thus, a granulation method suitable for granulating (pseudo-granulating or pelletizing) a raw material for iron making (sintering raw material or pellet raw material) containing fine iron ore to obtain a sintered ore. Is provided.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Kazuyuki Shinagawa 1-1, Hibata-cho, Tobata-ku, Kitakyushu-city, Fukuoka Prefecture Inside Nippon Steel Corporation Yawata Works (72) Inventor Haruhisa Suzuki Tokai-cho, Tokai-city, Aichi Prefecture 5-3 Nippon Steel Corporation Nagoya Works (72) Inventor Katsuyuki Kono 5-8 Nishimitabicho, Suita City, Osaka Prefecture Nippon Shokubai Co., Ltd. (72) Inventor Atsushi Motoyama Nishiomiburi, Suita City, Osaka Prefecture No. 5-8, Nippon Shokubai Co., Ltd. (72) Keiichi Nakamoto, Inventor Keiichi Nakamoto No. 5-8, Nishiomibashi-cho, Suita-shi, Osaka F-term (reference) 4K001 AA10 CA18 CA29 CA39

Claims (5)

[Claims] 1. A treating agent used for granulating a raw material for iron making containing fine iron ore, a polymer compound having an acid group and a polyalkylene glycol chain, a β-naphthalene sulfonate formalin condensate A granulating treatment agent for iron-making, comprising at least one polymer compound selected from the group consisting of melamine sulfonate formalin condensate, aromatic aminosulfonic acid polymer, and ligninsulfonic acid modified product. 2. A treating agent used for granulating iron-making raw materials containing fine iron ore, comprising a polymer compound having an acid group and a polyalkylene glycol chain. Granulation agent. 3. The granulating agent according to claim 2, wherein the acid group of the polymer compound is a carboxyl group and / or a salt thereof. 4. The granulating agent for iron making according to claim 2, wherein the polyalkylene glycol chain of the polymer compound contains a structural unit derived from polyethylene glycol. 5. A method for granulating a raw material for ironmaking, wherein the granulating agent for ironmaking according to any one of claims 1 to 4 is added to the raw material for ironmaking. Processing method.