BRPI0814206B1 - AGGLUTINATING MATERIAL FOR INCREASING HEAT RESISTANCE OF OIL POWDER AND METHOD OF OBTAINING PELLETS FROM AGGLUTINATING MATERIAL - Google Patents

Description

BACKGROUND OF THE INVENTION "BINDING MATERIAL FOR INCREASING OIL POWDER HEAT RESISTANCE AND PELLET METHOD OF THE BINDING MATERIAL" Technical Field The present invention relates to a binder material for increasing the heat resistance of powders. Ore, which is used to pellet ore powders from iron mills, steel mills, non-ferrous smelting houses etc., a pellet using the same, and pellet production. Prior Art So far, pelletizing of ore powders has been realized for the effective use of ore powders such as ore powders in iron mills, steel mills, non-ferrous smelters etc., and against depletion of ore powders. good quality mineral sources.

Among the known processes for pelletizing ore powders is a baking pelletizing process where ore powders are thrown into a drum or pan granulator and then baked, and a cold pelletizing process where the baking step is dispensed for the purpose of saving energy.

The ore powder binder materials used in these ore powder pelletizing processes include a binder material comprising normal Portland cement, a binder material comprising quicklime and granulated blast furnace slag, a binder material comprising a calcium aluminate compound and a fine powder inorganic material, and a binder material comprising normal Portland cement and calcium aluminate (see Non-Patent Publication 1, Non-Patent Publication 2, Patent Publication 1 and Patent Publication 2).

The problems with these binder materials, however, are that the heat resistance is so much lower than that of sintered ores that their air permeability deteriorates due to dust formation after being introduced into a blast furnace: there is a certain limitation in feed .

In this report "heat resistance" refers to the compressive strength of, for example, a pellet composed of ore powders and a binder material with increasing heat resistance that was introduced into a blast furnace and then baked at a temperature. from 600 to 1000 ° C. A conventional binder material comprising normal Portland cement should have a heat resistance of about 3 to 5 N / mm2.

On the other hand, "cold resistance" refers to the compressive strength of a pellet after curing in the open air and immediately before being introduced into a blast furnace, and this pellet should generally have a cold resistance of about 3 to 10 N / mm2.

Non-Patent Publication 1: Shigeru Amano, Yukihiro Abe, Kazushige Yamaguchi, Hironao Matsuoka, Shoichi Takano, Jitsuo Aida & Kazuyuki Morita, Development of Cementless Cold Pellets, Iron and Copper, Vol. 77, No. 6, p. 45-52 (1991) Non-Patent Publication 2: Masanori Nakano, Massaki Naito, Kenichi Higuchi & Koji Morimoto, Non-spherical Carbon Composite Agglomerates: Lab-scale Manufacturing and Quality Assessment, ISIJ International, Vol. 44, No. 12, pages 2079-2085 (2004) Patent Publication 1: JP (A) 05-171303 Patent Publication 2: JP (A) 05-073707 Description of the Invention Objective to Be Achieved by the Invention The present invention aims to provide a binder material for increasing the heat resistance of ore powders having a cold resistance greater than or equal to that of a conventional ore binder material, a pellet obtained using such material, and a method for pellet production.

Means of Achieving the Purpose According to the invention, we offer a binder material to increase the heat resistance of ore powders, which comprises one or two of cement and quicklime, slag and a silica substance, and has a chemical composition. containing 3 to 56% CaO, 3 to 40% Al 2 O 3 and 31 to 86% Si02 to total CaO, Al 2 O 3 and Si 2 O. The binder material of the invention comprises 1 to 76 parts of one or two of cement and quicklime, 2 to 76 parts of slag, and 2 to 95 parts of a silica substance. The binder material of the invention contains the silica substance Si02 component in an amount of at least 45%. The binder material of the invention further contains plaster, anhydrous plaster (anhydrite), and semihydrate plaster. The binder material of the invention contains plaster, anhydrite, and semihydrate plaster in an amount of less than 5 parts per 100 parts of the binder material. The binder material of the invention further contains a water reducing mixture. The binder material of the invention contains the water reducing mixture in an amount of 0.5 to 8 parts per 100 parts of the binder material.

According to the invention, the water reducing mixture comprises a maleic anhydride copolymer of an alkenyl ether represented by R10 (A10) mR2 where A10 is one, or a mixture of two or more, of 2 or 3 oxyalkylene groups. as long as two or more oxyalkylene groups may be added as a block or at random, R 1 is an alkenyl group having 2 to 5 carbon atoms, R 2 is an alkyl group having 1 to 4 carbon atoms, in ranges from 20 to 150 indicating the average number of moles of addition, and a polyalkenyl ether represented by Z [O (A20) nR3] where Z is a residue of a compound with 2 to 8 hydroxyl groups, A20 is one, or a mixture of two or further, of 2 or 3 carbon atoms oxyalkylene groups as long as two or more oxyalkylene groups may be added as a block or at random, R 3 is an alkenyl group having 2 to 5 carbon atoms, n is 0 or 1 or more indicating the average number of moles of addition, and the range of 2 to 8.

In accordance with the invention, we offer a pellet containing ore powders, said binder material, and water.

According to the invention, said pellet contains said binder material in an amount of 3 to 20 parts per 100 parts of ore powders.

According to the invention, said pellet has a water / (ore powders + said binder material) ratio of 0.03 to 0.3.

According to the invention, we offer a method for producing said pellet.

Advantages of the Invention According to the invention, it is possible to offer a binder material to increase the heat resistance of ore powders which has a cold resistance greater than or equal to that of conventional binder materials and which is capable of having heat resistance, pellet obtained using this material, and a method for pellet production.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is illustrative of the influences of the water reducing mixture on ambient temperature resistance and slow temper (heat resistance) resistance. Fig. 2 is illustrative of the influences of anhydrite (combined with the water reducing mixture) on ambient temperature resistance and on slow temper resistance (heat resistance).

Best Mode for Carrying Out the Invention The present invention will now be explained in detail.

Note that unless otherwise indicated, parts and% will be given in terms of mass. The present invention relates to a binder material for increasing the heat resistance of ore powders, which has a specific chemical composition comprising cement, slag, and a silica substance.

"Ore powders" in this case include, for example, filings from gold ore, silver ore, copper ore, lead ore, bismuth ore, tin ore, zinc ore, iron ore, iron sulfide, chromium iron ore, manganese ore, tungsten ore, molybdenum ore, nickel ore, cobalt ore etc., and the filings can be used alone or in a mixture of two or more. There are no specific limitations on the cements used in this invention, and thus common cements may be used. Specifically, various Portland cements such as normal Portland cement, high premature strength Portland cement, ultra high premature strength Portland cement, moderate heat Portland cement and low heat Portland cement can be used. with fine lime powders etc. mixed with these Portland cements, chip recycling cements or so-called ecocements etc. which can be used alone or in a mixture of two or more. The term "lime" used in this report refers to quicklime represented by the chemical formula: CaO, and hydrated lime represented by the chemical formula Ca (OH) 2.

Although there are no specific limitations on quicklime, it is usually preferable to use industrial products containing more than 90% calcium oxide (CaO), and although there are no specific limitations on hydrated lime, it is usually preferable to use industrial products containing more than 65% calcium oxide (CaO). % calcium oxide (CaO). These products can be used in combination of two or more. Lime should preferably have a particle size of at least 2,000 cm2 / g, and more preferably at least 3,000 cm2 / g in terms of Blaine specific surface area (hereinafter referred to as Blaine value). Outside this range, the ability of the binder to exhibit cold resistance or heat resistance tends to worsen. The term "slag" used in this report includes tempered blast furnace slag and slowly tempered blast furnace slag that appear as by-products during the production of pig iron in blast furnaces, slag resulting from steel production such as converter slag that appears in the steps. steel slag and electric furnace slag, which may be used alone or in a mixture of two or more. However, tempered blast furnace slag is preferred for economic considerations and availability. The slag should preferably have a particle size of at least 2,000 cm 2 / g, and more preferably at least 3,000 cm 2 / g in terms of the Blaine value. Outside this range, the ability of the binder to exhibit cold resistance or heat resistance tends to worsen. The term "silicous substance" used in this report refers to a substance containing 45% or more of the S1O2 component as a chemical component and, for example, includes fumed silica, fine ash, coarse ash, volcanic ash, diatomaceous earth, silica white matter, fused silica, shirasu balloon, silica sand and rice husk ash, which may be used alone or in a mixture of two or more. Among others, fine ash is also preferred for economic considerations and availability. The silicous substance preferably should have a spherical shape in view of the ability of the particles to be filled, and the ease with which projections develop during sintering reactions.

It is also preferable to use a silica substance whose components harmful to blast furnace operations such as sodium, potassium and phosphorus components are reduced as much as possible. The silicous substance should preferably have a particle size of at least 2,000 cm2 / g, and more preferably at least 3,000 cm2 / g in terms of the Blaine value. Outside this range, the ability of the binder material to exhibit cold resistance or heat resistance tends to decrease. There are no specific limitations on the mixing ratio of one or two between cement and lime, slag and silica substance; however, it is preferable to use 1 to 76 parts of one or two of cement and lime, 2 to 95 parts of slag, and 2 to 95 parts of the silica substance. When cement is used, it is more preferable to use 1 to 76 parts of cement, 2 to 76 parts of slag, and 2 to 95 parts of silica substance, and even more preferable to use 3 to 75 parts of cement, 4 to 74 parts of slag. , and 4 to 85 parts of the silica substance. When lime is used, it is more preferable to use 1 to 50 parts lime, 2 to 95 parts slag, and 3 to 95 parts silica substance, and even more preferable to use 2 to 48 parts lime, 4 to 93 parts slag. , and 5 to 93 parts of the silica substance.

Outside this range, neither sufficient cold resistance nor sufficient heat resistance can be guaranteed.

In the binder material for increasing the heat resistance of ore powders according to the invention, one or two of cement and lime, slag, and the silica substance are mixed to increase the cold resistance, with a chemical composition of 3 to 56 ° C. % CaO, 3 to 40% Al2O3, and 30 to 86% S1O2 in total CaO, AI2O3, and S1O2. The binder material of the invention may further contain plaster, anhydrous plaster, and semihydrate plaster. The term "plaster" used in this report includes dihydrate plaster, semihydrate plaster, anhydrous type II plaster, and anhydrous type III plaster, among which anhydrous plaster type II and anhydrous plaster type III are preferred. The plaster content should preferably be less than 5 parts, and more preferably less than 3 parts. With a plaster content beyond this range, heat resistance tends to decrease. The plaster should have a particle size preferably of at least 2,000 cm 2 / g, and more preferably at least 3,000 cm 2 / g in terms of the Blaine value. Outside this range, the ability of the binder to exhibit cold resistance or heat resistance tends to worsen.

Preferably in the invention, the water reducing mixture should be used to further increase heat resistance. The type of water reducing mixture should be based on products of the formalin condensation with alkyl allylsulfonates, naphthalene sulfonates, and melamine sulfonates, high molecular weight polycarboxylate compounds that can be used alone or in combination of two or more of these. in liquid or powder form. It is particularly preferable to use a water reducing mixture comprising a maleic anhydride copolymer of an alkenyl ether represented by R10 (AlO) mR2 where A10 is one or a mixture of two or more oxyalkylene groups having 2 or 3 carbon atoms provided that two or more oxyalkylene groups may be added as a block or at random, R1 is an alkenyl group having 2 to 5 carbon atoms, R2 is an alkyl group having 1 to 4 carbon atoms, ranging from 20 to 150 indicating the average number of moles of addition, and a polyalkenyl ether represented by Z [0 (A20) nR3] where Z is a residue of a compound with 2 to 8 hydroxyl groups, A20 is one, or a mixture of two or more, oxyalkylene groups of 2 or 3 carbon atoms as long as two or more oxyalkylene groups may be added as a block or at random, R3 is an alkenyl group of 2 to 5 carbon atoms, n is 0 or 1 or more indicating the average number of moles of addition No, and ranges from 2 to 8. The amount of water reducing mixture used should preferably be from 0.5 to 8 parts, and more preferably 1 to 6 parts per 100 parts of the binder material. With less than 0.5 part no effect is obtained and with more than 8 parts no increase in heat resistance is observed and material wastage occurs.

In the invention, blast furnace Portland cement can be used as cement and slag, or mixed siliceous cement and fine ash cement can be used as cement and silica substance. The binder material of the invention should have a chemical composition preferably comprising 3 to 56% CaO, 3 to 40% Al 2 O 3 and 30 to 86% S 1 O 2, and more preferably 7 to 45% CaO, 5 to 35% Al 2 O 3. and 32 to 76% SiO 2 in total CaO, Al 2 O 3, and SiO 2. Outside this range, binder material should not develop heat resistance. There are no specific limitations on how to mix these starting materials: they may be premixed prior to pelletizing, or they may be mixed during pelletizing. The binder material of the invention should preferably have a particle size of at least 2,000 m2 / g, and more preferably at least 3,000 m2 / g in terms of the Blaine value. Outside this range, the cold resistance of the binder material tends to decrease. The amount of binder material of the invention used should preferably be from 3 to 20 parts, and more preferably 5 to 15 parts per 100 parts of ore powders. With less than 3 parts, the ability of the binder material to exhibit cold resistance and heat resistance tends to worsen, and with more than 20 parts material waste may occur.

Although there are no specific limitations on the ratio of water / (ore powders + the binder material of the invention), this ratio should preferably range from 0.03 to 0.3, and more preferably from 0.05 to 0.2. At less than 0.03, cold resistance tends to worsen, and reduction reactions tend to be less satisfactory after binder material is introduced into the blast furnace. At over 0.3, the chipboard tends to decrease in heat resistance due to post-baking cracking due to thermal contractions.

In the production of a pellet using the binder material of the invention, coke powders may be added to improve the pellet reduction capacity after being introduced into a blast furnace.

It is also possible to add one or two or more of water reducing mixtures, high efficiency water reducing mixtures, AE water reducing mixtures, fluidizers, viscosity enhancers, contraction reducers, ambient conditions controls etc. without prejudice to the object of the invention. There are no specific limitations on how to cure pellets using the binder material of the invention: for example, granulation can be mentioned using a drum or pan type granulator, as well as pressing, wet pressing, extrusion pressing and the like. There are no specific limitations on how to cure the produced pellets: for example, we can mention curing at normal temperature and pressure, as well as autoclaving curing, steam curing, wet air curing, heat curing and so on.

EXAMPLES

Although the invention is now explained in greater detail with reference to the experimental examples, it should be understood that the invention is by no means limited to them. (Experimental Example 1) The cements, slag, and silica substances shown in Table 1 were mixed to prepare binder materials with the chemical compositions of CaO, Al 2 O 3, and SiO 2 shown in Table 1.

Thirteen (13) parts of the prepared binder material were mixed with 100 parts of ore powders, and 15 parts of were mixed with a total of 100 parts of ore powders and of the binder material prepared to prepare a kneaded product.

Fifty (50) grams of the prepared kneaded product was introduced into a f40 mm die press machine, a 7.8 MPa press pressure load was applied thereto using an SSP-10A type press machine for FT- IR, produced by Shimadzu Corporation, and the die press machine was held for 30 seconds, and thereafter the kneaded product was released from the die press machine to prepare a f40mm ~ 16mm pellet. The prepared pellet was cured at normal temperature and pressure to measure its cold resistance and heat resistance. The results are shown in Table 1. (Materials used) Cement A: produced by DENKA and available under the trade name "Portland Normal Cement" having a Blaine value of 3,150 cm2 / g and a specific gravity of 3.13 with a composition. of 72% CaO, 6% A1203 and 22% Si02.

Slag: Blast furnace slag produced by Nippon Steel Blast-Furnace Slag Cement Co., Ltd., and available under the tradename "EsmentSuper 60P" having a Blaine value of 6,000 cm2 / g and a specific gravity of 2.91 with a composition of 49% CaO, 16% Al 2 O 3 and 35% Si 2 O.

Silica substance A: fine ash occurring in coal-fired power plants: a JIS II product having a Blaine value of 3,700 cm2 / g and a specific gravity of 2.35 with a composition of 6% CaO, 27% A1203 and 67% Si02.

Silica substance B: fine ash occurring in coal-fired power plants: a JIS II product having a Blaine value of 3,700 cm2 / g and a specific gravity of 2.35 with a composition of 0% CaO, 32% Al 2 O 3 and 68% Si 2 O.

Silica substance C: fine ash occurring in coal-fired power plants: a JIS II product having a Blaine value of 3,700 cm2 / g and a specific gravity of 2.37 with a composition of 0% CaO, 46% A1203 and 54% Si02.

Silica substance D: fused silica produced by DENKA and available under the trade name "DENKA fused silica" having a BET specific surface area of 11.3 m2 / g and a specific gravity of 2.26 with a composition of 0% CaO, 0% Al 2 O 3 and 100% Si 2 O.

Silica substance E: Sandy Soil Powder produced by Izumi Industrial Company, having a Blaine value of 10,400 cm2 / g and a specific gravity of 3.63 with a composition of 3% CaO, 34% A1203 and 63% Si02.

Silica substance F: y-2Ca0.Si02 which was synthesized by mixing reagent grade calcium carbonate and reagent grade silica at a molar Ca0 / Si02 ratio of 2.0 and baking the mixture in an electric oven at a temperature of 1,500 ° C. The baked product was then cooled to a Blaine value of 6,000 cm2 / g. Specific gravity was 3.01 with a composition of 63% CaO, 2% Al 2 O 3 and 35% Si 2 O. Ore powders: Iron or hematite ore powders having a specific gravity of 4.95 and an inframed of 3 mm Water: Freshwater (Curing Methods) Curing at normal temperature and pressure: The prepared pellet was placed in a vinyl bag , and then the opening was closed with a rubber band to seal it, and then the pellet was cured for 14 days in an atmosphere at atmospheric pressure at 20 ° C. (Measurement Methods) Cold Resistance: The prepared pellet was cured at normal temperature and pressure in a room temperature environment of 20 ° C to measure its compressive strength at a material age of 14 days.

Heat resistance: The prepared pellet was cured at normal temperature and pressure in a room temperature environment of 20 ° C, and then it was cooked at a material age of 14 days in a nitrogen atmosphere at a heating rate of 10 ° C / min with a maximum temperature of 860 ° C, and then it was removed from the oven after reaching the maximum temperature to measure its compressive strength.

Table 1 (Cement, slag and substance Si are given in parts, 1-1 *, 1-7 *. 1-8 *, 1-14 *, 1-21 *: comparative From the results in Table 1, we find that the materials Agents of the invention for increasing the heat resistance of ore powders are superior in terms of improvements in heat resistance.

That is, by appropriate formulation of cement, slag, and silica substance, the binder materials of the invention exhibit cold resistance greater than or equal to that of the comparative examples and are better able to exhibit heat resistance than the comparative examples.

The pellets obtained using the binder materials with a chemical composition in the range of the invention (3 to 56% CaO, 3 to 40% Al203, and 30 to 86% Si02 in total CaO, Al2On, and Si02) are improved to terms of cold resistance and heat resistance (Experiences No. ® 1-2 to 1-6, 1-9 to 1-13, 1-15 to 1-20, 1-22 and 1-23), with less of 31 CaO, heat resistance is high but cold resistance is extremely low (Experiment Ne 1-1); With more than 561 CaO, cold resistance is high but the ability of the binder material to exhibit heat resistance remains insufficient (Experiment Ν '1-7}; with less than 3% AI2O3, heat resistance is high but strength cold decreases (Experiment Na 1-8), with more than 40% Al? 03, both cold resistance and heat resistance decrease (Experiment Ν '1-14) with less than 30-% SiO; ., cold resistance is high but the ability of the binder material to exhibit heat resistance remains insufficient, and with more than 86% SiO2, both cold resistance and heat resistance decrease (Experiment Ν '1-21} Therefore, the chemical composition of the binder material should preferably vary within the range above, (Experimental Example 2) Experimental Example 1 was repeated with the difference that the cement, slag and silica substance in Table 2 were mixed. The results also are also presented in Table 2.

Table 2 (Cement, slag and substance Si are given in parts) 2-1 *, 2-9 *, 2-17 *: comparative From the results of Table 2, we find that the binder materials of the invention are superior in terms of improvements in heat resistance.

That is, by appropriate formulation of cement, slag, and silica substance, the binder materials of the invention exhibit cold resistance greater than or equal to that of the comparative examples and are better able to exhibit heat resistance than the comparative examples. (Experimental Example 3) Experimental Example 1 was repeated with the difference that the cement, slag and silicose substance shown in Table 3 were mixed. The results are also presented in Table 3. (Materials used) Cement b: Moderate heat Portland cement produced by DENKA and available under the trade name "DENKA Moderate Heat Portland Cement" having a Blaine value of 3.050 cmVg and a gravity 3.20 with a composition of 70% CaO, 41 Al203 and 26% Si02.

Cement c; low heat Portland cement produced by faiheiyo Cement Corporation and available under the trade name "Low Heat Portland Cement" having a Blaine value of 3,470 cmC / g and a specific gravity of 3.21 with a 69% CaO composition, 3% Al203 and 28% SiO2.

Blast Furnace Portland Cement: produced by DENKA and available under the trade name "DENKA Blast Furnace Portland Cement" having a Blaine value of 3.970 cm2 / g and a specific gravity of 3.05 with a composition of 63% of CaO, 9% A1203 and 28% SiO-1.

Fine Ash Cement: produced by DENKA and available under the trade name "DENKA Fine Ash Cement (Type B)" having a Blaine value of 3,500 cm2 / g and a specific gravity of 2,96 with a composition of 71% of CaO, 5% Al2O3 and 24% SiO2 ■ Table 3 (Cement, slag and Si substance are given in parts) * 1: Mixture of 75 parts blast furnace Portland cement and 25 parts Si * 2: Mixture of 10 parts fine ash cement and 90 parts slag From the results of Table 3, we find that the binder materials of the invention for increasing heat resistance are superior in terms of improvements in heat resistance regardless of cement type. We also find that by the proper formulation of blast furnace Portland cement and silica substance as well as fine ash and slag cement, the invention has good results. (Experimental Example 4) Experimental Example 1 was repeated with the difference that the cement, slag and silicose substance shown in Table 4 were mixed. Results are also presented in Table 4. (Materials used) Anhydrous plaster: Type 11 natural anhydrous plaster from Thailand and having a Blaine value of 8,100 craVg and a specific gravity of 2,94 with a composition of 95% CaO, 2% Al 2 O 3 and 3% SiO 2 Table 4 (Cement, slag, substance Si and plaster are given in parts) From the results of Table 4, we find that the binder materials of the invention have improved cold resistance by containing the appropriate amount of plaster.

That is, by the appropriate formulation of cement, slag, silica substance and gypsum, the binder materials of the invention for increasing heat resistance are more improved in terms of cold resistance and their ability to exhibit heat resistance than a comparative material. (Experimental Example 5) Experimental Example 1 was repeated with the difference that 32 parts a, 44 parts slag, and 24 parts silica substance A were used to prepare binder materials which were then mixed with 100 parts powders. of iron ore in the quantities shown in Table 5. The results are also presented in Table 5.

Table 5 5-1 *: comparative The amount (parts) of the binder material is given relative to 100 parts of ore powders.

From the results of Table 5, we find that the binder materials of the invention, if added to ore powders in the appropriate amount, exhibit cold resistance greater than or equal to that of a comparative example, and are better able to exhibit heat resistance than the example. comparative. (Experimental Example 6) Experimental Example 1 was repeated with the difference that 32 parts of a, 4 parts of slag, and 24 parts of silyl substance A were used to prepare binder materials, 13 parts of prepared binder material. were mixed with 100 parts of ore powders, and the amounts of water shown in Table 6 were added until a total of 100 parts of ore powders and prepared binder material were reached. Results are also presented in Table 6.

Table 6 The amount (mass%) of water is given relative to the total ore powders and the binder material of the invention.

From the results of Table 6, we find that the binder materials of the invention can have improved heat resistance by properly determining the ratio of water / (ore powders + the binder material of the invention).

That is, by formulating cement, slag and silica substance, and by properly determining the ratio of water / (ore powders + the binder material of the invention), the binder materials of the invention for increasing heat resistance exhibit greater cold resistance. or equal to that of a comparative example, and are more capable of heat resistance than the comparative example. (Experimental Example 7) Thirty two (32) parts a, 44 parts slag, and 24 parts silica substance A were used to prepare binder materials, and then 13 parts of the prepared binder material were mixed with 100 parts of iron ore powders, and then 15 parts of water were mixed with a total of 100 parts iron ore and binder material prepared to prepare pellets. Experimental Example 1 was repeated except that the pellets prepared after granulation were cured as shown in Table 7. The results are also presented in Table 7. (Curing Method) Steam Curing: After pelletizing, each pellet was allowed to stand for 2 hours. Then each pellet was steam cured under conditions involving heating at a heating rate of 15 ° C / min and retention for 3 hours at a maximum temperature of 70 ° C. The following day, the pellet was removed from the cure tank, and then cured for 13 days in an environment at 20 ° C.

Autoclave Curing: After pelletizing, each pellet was introduced into a vapor pressure vessel where it was cured for 6 hours in an environment with a vapor pressure of 10 atm and a temperature of 170 ° C, and thereafter curing. continued for 14 days in an environment at room temperature of 20 ° C.

Curing in humid air: After peiotization, each pellet was cured for 14 days in an environment at room temperature of 20ºC with a humidity of 100%.

Heat cure: After peiotization, each pellet was sealed and cured for 1 day in an environment at room temperature of 20 ° C. After curing for 1 day in the room at 20 ° C, it was cured for 13 days in a 40 ° C dryer.

From the results of Table 7, we find that the binder materials of the invention can have improved heat resistance regardless of how they have cured. (Experimental Example 8) Experimental Example 4 was repeated with the difference that 50 parts a / 40 parts slag cement, 10 parts silica substance A and 1 part anhydrous plaster were mixed with addition of the water reducing mixture in amounts. 0, 0,6, 1,2 and 3,0 parts by mass based on solid matter (0, 1,0, 2,0 and 5,0 parts by mass based on aqueous solution). Resistance are shown in Table 8, and the influence of the water reducing mixture on cold resistance and heat resistance is shown in Fig. 1. (Material used) Water reducing mixture: Commercial Product - A 60% aqueous solution of a copolymer of polyalkenyl ether and maleic anhydride Table 8 The amount of the water reducing mixture is given relative to 100 parts of the binder material.

From Table 8 and Fig. 1, we find that by the addition of the water reducing mixture, the binder materials of the invention can have improved cold resistance and heat resistance in proportion to an increasing amount of the water reducing mixture. That is, by appropriate formulation of cement, slag, silicaceous substance, plaster and water reducing mixture, the binder materials of the invention for increasing heat resistance may have better cold resistance than that of the comparative example, and are more capable of heat resistance than the comparative example. (Experimental Example 9) Experimental Example 8 was repeated except that 50 parts a, 40 parts slag, 10 parts silica substance A, and 1 part (based on solid matter) of the water reducing mixture were mixed with plaster in varying quantities of 0, 1, 2 and 3 parts. Resistance measurements are presented in Table 9, and the influence of plaster (in the case of addition of the water reducing mixture) on cold resistance and heat resistance are shown in Fig. 2.

Table 9 The amount (parts) of plaster is given relative to 100 parts of the binder material.

From Table 9 and Fig. 1 we find that with the addition of the water reducing mixture, there is an improvement in the heat resistance found if the amount of anhydrous plaster is up to 2 parts, but with more than 3 parts there is no effect. . (Experimental Example 10) Experimental Example 1 was repeated with the difference that the lime, slag and syrupic substances shown in Table 10 were mixed to prepare binder materials having the chemical compositions of CaO, Al 2 O 3 / and S 1 O 2 in Table 10. Results are also presented in Table 10. (Material used) Cal a; Guaranteed living quicklime in a pulverized form produced by Wako Pure Chemical Industries, Ltd. and having a Blaine value of 6.000 cm 2 / g and a specific gravity of 3.31 with a chemical composition of 100% CaO, 0% Al20 ; and 0% SiO 2.

Table 10 (Lime, slag and substance Si are given in parts) 10-1 *, 10-7 *, 10-8 *, 10-14 *, 10-15 *, 10-21 *: comparative PSOAM *: size of binder material particle From the results of Table 10, we find that the binder materials of the invention are superior in terms of improvements in heat resistance.

That is, by appropriate formulation of lime, slag and silica substance, the binder materials of the invention exhibit cold resistance greater than or equal to that of the comparative examples, and are better able to exhibit heat resistance than the comparative examples. The pellets obtained using the binder materials with a chemical composition in the range of the invention (3 to 56% CaO, 3 to 40% Al 2 O 3, and 30 to 86% Si 2 total CaO, Al 2 O 3, and Si 2 O) are improved to terms of cold resistance and heat resistance (Experiments Nos 10-2 to 10-6, 10-9 to 10-13, 10-16 to 10-20, 10-22 and 10-23). With less than 3% CaO, heat resistance is high but cold resistance is extremely low (Experiment # 10-1); With more than 56% CaO, cold resistance is high but the ability of the binder to exhibit heat resistance remains insufficient (Experiment No. 10-7); at less than 3% or more than 40% of A1203, heat resistance is high but cold resistance decreases (Experiments Nos. 10-8 and 10-14); with less than 30% S1O2, cold resistance is high but the ability of the binder to exhibit heat resistance remains insufficient (Experiment No. 10-15); and with over 86% Si02, heat resistance is high but cold resistance is extremely low (Experiment # 10-21). Accordingly, the chemical composition of the binder material should preferably vary within the above range. (Experimental Example 11) Experimental Example 10 was repeated except that the lime, slag and silicose substances shown in Table 11 were mixed. The results are also presented in Table 11. (Material used) Cal b: Reagent hydrated lime guaranteed in a pulverized form produced by Wako Pure Chemical Industries, Ltd. and having an Elaine value of 6,000 cmVg and a specific gravity of 2.08 with a chemical composition of 100% CaO, 0% Al 1 O 3 and 1% Si 2 O.

Table 11 (Lime, slag and substance Si are given in parts) 11 -1 *: comparative PSOAM *: particle size of binder material From the results of Table 11, we find that the binder materials of the invention are superior in terms of strength improvements to the heat.

That is, by the appropriate formulation of lime, slag and silica substance, the binder materials of the invention exhibit cold resistance greater than or equal to that of the comparative example, and are better able to exhibit heat resistance than the comparative example. (Experimental Example 12) Experimental Example 10 was repeated except that the lime, slag and silicose substance shown in Table 12 were mixed. Results are also presented in Table 12.

Table 12 (Cal, slag and substance Si are given in parts) 12-1 *: comparative PSOAM *: particle size of binder material From the results of Table 12, we find that the binder materials of the invention are superior in terms of strength improvements to the heat.

That is, by the appropriate formulation of lime, slag and silica substance, the binder materials of the invention exhibit cold resistance greater than or equal to that of the comparative example, and are better able to exhibit heat resistance than the comparative example. (Experimental Example 13) Experimental Example 10 was repeated except that the lime, slag and silicose substance shown in Table 13 were mixed. Results are also presented in Table 13.

Table 13 (Cal, slag and substance Si are given in parts) 13-1 *: comparative PSOAM *: particle size of binder material From the results of Table 13, we find that the binder materials of the invention are superior in terms of strength improvements. That is, by appropriate formulation of lime, slag and silica substance, the binder materials of the invention exhibit cold resistance greater than or equal to that of the comparative example, and are better able to exhibit heat resistance than the comparative example. . (Experimental Example 14) Experimental Example 10 was repeated except that the lime, slag, silica substance and plaster presented in Table 14 were mixed. Results are also presented in Table 14. (Material used) Anhydrous plaster: Type II natural anhydrous plaster from Thailand and having a Blaine value of 8,100 cm2 / g and a specific gravity of 2,94 with a composition of 95% CaO, 21 Al2Q3 and 3% SiO2 .

Table 14 (Lime, slag, substance Si and plaster are given in parts) PSOAM *: Particle Size of Binder Material From the results of Table 14, we find that by containing the appropriate amounts of plaster in the binder material of the invention, some improvement occurs in cold resistance.

That is, by the appropriate formulation of lime, slag, silica substance and plaster, the binder materials of the invention exhibit cold resistance greater than or equal to that of the comparative example, and are better able to exhibit heat resistance than the comparative example. (Experimental Example 15) Experimental Example 10 was repeated with the difference that 3 parts lime, 27 parts slag, and 70 parts silica substance A were used to prepare binder materials, and binder materials in the amounts shown in Table. 15 were mixed with 100 parts of ore powders. Results are also presented in Table 15.

Table 15 15-1 *: comparative The amount (parts) of the binder material is given relative to 100 parts of ore powders.

From the results of Table 15, we find that the binder materials of the invention, if added to ore powders in the appropriate amount, exhibit cold resistance greater than or equal to that of the comparative example, and are better able to exhibit heat resistance than the comparative example. . (Experimental Example 16) Experimental Example 10 was repeated with the difference that 3 parts lime, 27 parts slag, and 70 parts silica substance A were used to prepare binder materials, 13 parts of the prepared binder material were mixed. with 100 parts of ore powders, and water in the amounts shown in Table 16 was added until a total of 100 parts of ore powders and agglutinating material was prepared. Results are also presented in Table 16.

Table 16 The amount (%) of water is given relative to the total ore powders and binder material of the invention.

From the results of Table 16, we find that the binder materials of the invention can have improved heat resistance by properly determining the ratio of water / (ore powders + the binder material of the invention).

That is, by formulating quicklime / slime, slag and silicous material, and by properly determining the ratio of water / (ore powders + the binder material of the invention), the binder materials of the invention exhibit greater or lesser cold resistance. same as that of a comparative example, and are more capable of heat resistance than the comparative example. (Experimental Example 17) Three (3) parts lime, 27 parts slag, and 70 parts silica substance A were used to prepare binder materials, and then 13 parts of the prepared binder material were mixed with 100 parts powder. then 15 parts of water were mixed with a total of 100 parts of ore powders and pellet prepared binder. Experimental Example 10 was repeated with the difference that after granulation, each pellet was cured under varying conditions such as those shown in Table 17 (for the respective conditions for steam curing, autoclave curing, wet air curing, and heat curing, see Example 7). are shown in Table 17.

From the results of Table 17, we find that the binder materials of the invention can have improved high heat resistance regardless of how they are cured.

Industrial Applicability The binder materials of the invention for increasing the heat resistance of ore powders may not only have cold resistance greater than or equal to that of conventional materials but also their ability to exhibit heat resistance is well guaranteed; It can be used to pellet the filings from ore mines, iron mills, steel mills, non-ferrous smelting houses etc., and collected from these facilities.

Claims (14)

1 . Binder material for increasing the heat resistance of ore powders, characterized in that it comprises one or two of cement and quicklime, slag and a silica substance, and with a chemical composition containing 3 to 56% CaO, 3 to 40%. Al 2 O 3 and 30 to 86% SiO 2 in total CaO, Al 2 O 3 and SiO 2. 2 . Binder material according to claim 1, characterized in that it comprises 1 to 76 parts of one or two of cement and quicklime, 2 to 95 parts of slag, and 2 to 95 parts of the silica substance. Binder material according to claim 1, characterized in that it contains the silica substance component SiO 2 in an amount of at least 45%. 4 Binder material according to claim 1, characterized in that it further contains plaster, anhydrite, and semihydrate plaster. Binder material according to claim 4, characterized in that it contains plaster in an amount of less than 5 parts per 100 parts of the binder material. Binder material according to claim 1, characterized in that it further contains a water reducing mixture. Binder material according to claim 6, characterized in that it contains the water reducing mixture in an amount of 0.5 to 8 parts per 100 parts of the binder material. A binder material according to claim 6, wherein the water reducing mixture comprises a maleic anhydride copolymer of an alkenyl ether represented by R10 (AlO) mR2 where A10 is one, or a mixture of two or more, of groups. oxyalkylene having 2 or 3 carbon atoms as long as two or more oxyalkylene groups may be added as a block or at random, R 1 is an alkenyl group having 2 to 5 carbon atoms, R 2 is an alkyl group having 1 to 4 carbon atoms. from 20 to 150 indicating the average number of moles of addition, and a polyalkenyl ether represented by Z [O (A20) nR3] where Z is a residue of a compound with 2 to 8 hydroxyl groups, A20 is a , or a mixture of two or more oxyalkylene groups of 2 or 3 carbon atoms as long as two or more oxyalkylene groups may be added as a block or randomly, R3 is an alkenyl group of 2 to 5 carbon atoms, n is 0 or 1 or more indicating the average number of moles of addition, and a ranges from 2 to 8. Binder Material for Increasing Heat Resistance of Ore Powders, Pellet Utilizing It, and Pellet Production, characterized in that it contains ore powders, the binder material according to any one of claims 1 to 8, and water. Binder Material for Increasing Heat Resistance of Ore Powder, Pellet Utilizing It, and Pellet Production according to claim 9, wherein said binder material is contained in an amount of 3 to 20 parts per 100 parts. of ore powders. Binder Material for Increasing Heat Resistance of Ore Powders, Pellet Utilizing It, and Pellet Production according to claim 9, characterized in that it has a water ratio / (ore powders + said binder material) from 0.03 to 0.3. A method for producing pellets of the binder material, characterized by transforming a mixture of the binder material according to any one of claims 1 to 8 and water into a pellet, and curing the pellet. A method for producing pellets of the binder material according to claim 12, wherein 3 to 20 parts of said binder material are mixed with 100 parts of ore powders. A method for producing pellets of the binder material according to claim 12, wherein the ratio of water / (ore powders + said binder material) ranges from 0.03 to 0.3.