CN102010933A - Molten iron dephosphorization agent manufactured by using converter dry-method dust-removal ash as raw material - Google Patents
Molten iron dephosphorization agent manufactured by using converter dry-method dust-removal ash as raw material Download PDFInfo
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- CN102010933A CN102010933A CN2010105370079A CN201010537007A CN102010933A CN 102010933 A CN102010933 A CN 102010933A CN 2010105370079 A CN2010105370079 A CN 2010105370079A CN 201010537007 A CN201010537007 A CN 201010537007A CN 102010933 A CN102010933 A CN 102010933A
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Abstract
The invention discloses a molten iron dephosphorization agent manufactured by using converter dry-method dust-removal ash as a raw material, which belongs to the technical field of steel making and molten iron pretreatment and is applicable to converter molten iron dephosphorization treatment. The dephosphorization agent comprises the following chemical components in percentage by weight: 45 to 65 percent of CaO, 15 to 35 percent of iron oxides (Fe2O3+FeO), 5 to 15 percent of CaF2 and 2 to 6 percent of SiO2, wherein the ratio of CaO to Fe2O3+FeO+CaF2 ranges from 1.0 to 3.0, and the ratio of CaO to SiO2 ranges from 9 to 16; and the hemispherical fusion temperature of the dephosphorization agent is not more than 1,200 DEG C. The raw material of the dephosphorization agent comprises 20 to 60 percent of converter dry-method dust-removal ash, 20 to 60 percent of active lime powder and 5 to 20 percent of fluorite powder. The dephosphorization agent has the advantages that: after the converter molten iron dephosphorization pretreatment is performed by using the dephosphorization agent, the P content can be kept below 0.030 percent; the converter dry-method dust-removal ash is recycled in a steel making process; and the cost of the converter dephosphorization pretreatment is reduced considerably.
Description
Technical field
The invention belongs to steel-making and hot metal pretreatment technical field, particularly relating to a kind of is the molten iron dephosphorization agent of raw material with converter dry method dust ash.
Background technology
Making constant progress of society makes the demand of high-quality Clean Steel constantly increase, because traditional hot metal ladle, torpedo tank car powder dephosphorization technology+converter less-slag refinery practice can't satisfy in enormous quantities, the processing requirement of low cost production Clean Steel, the technical process that the converter dephosphorization pre-treatment+few slag refinery practice is produced Clean Steel obtains promotion and application.Converter dephosphorization pre-treatment+few its characteristics of slag refinery practice production clean steel process flow process are to utilize the efficient characteristics of smelting of converter, realize in enormous quantities, the low cost production of Clean Steel.Though the molten iron stage is carried out the pretreated thermodynamics advantage of dephosphorization obviously, but because treatment temp is relatively low, the lime slagging is but difficult relatively, lime slagging rate is low, and for reaching certain basicity of slag, lime consumption can be higher relatively, for realize that dephosphorization pre-treatment finishing slag basicity is 2.0～2.5, after the dephosphorization pre-treatment molten iron [P] less than 0.03% smelting target, lime consumption generally reaches 25kg/t～35kg/t, and ore consumption is 20kg/t～30kg/t, and fluorite consumption is 3kg/t～5kg/t.
The converter dry dedusting technology produces a large amount of dedusting ash in steelmaking process, the dedusting ash main component is Fe
2O
3, FeO, CaO, MgO and SiO
2, as the waste that steelmaking process produces, how scientific and reasonable being used realizes capable of circulation mobile significant for supplementary material in the STEELMAKING PRODUCTION link.
Summary of the invention
The object of the present invention is to provide a kind of is the molten iron dephosphorization agent of raw material with converter dry method dust ash, is applicable to the processing of converter dephosphorization of molten iron.Utilize converter dry method dust ash as main raw material,, produce low-cost dephosphorizing agent with addition of part lime powder and fluorite powder.After this dephosphorizing agent was used in the pre-treatment of converter dephosphorization of molten iron, stable being controlled at below 0.030% of [P] energy not only realized the recycle of converter dry method dust ash in the steel-making link, and reduced converter dephosphorization pre-treatment cost significantly.
Principal feature of the present invention is embodied in following several respects:
(1) dephosphorizing agent raw material sources and consisting of: based on converter dry method dust ash, with addition of part lime powder and fluorite powder, its composition (wt%) is: converter dry method dust ash content 30～60%, quickened lime powder content 20～60%, fluorite powder content 5～15%.
(2) chemical ingredients of dephosphorizing agent the best (wt%) is: CaO content 45～65%, ferriferous oxide (Fe
2O
3+ FeO) content 15～35%, CaF
2Content 5～15%, MgO content are 1～3%, SiO
2Content 2～6%.
(3) chemical ingredients of dephosphorizing agent the best (wt%) composition need satisfy following requirement:
CaO/(Fe
2O
3+FeO+CaF
2)＝1.0～3.0％，CaO/(SiO
2)＝9～16％。
(4) requirement of the hemispherical temperature of dephosphorizing agent finished product is 1100～1200 ℃.
Be the stability of the composition of guaranteeing mixing powder and the balling-up of the course of processing, require lime powder, fluorite powder need satisfy following requirement:
(1) lime powder composition (wt%) requires CaO 〉=80%; Fluorite meal component (wt%) requires CaF
2〉=80%, moisture (wt%) requires less than 1.5%, and raw material blending is after cold pressing forming process, and finished product is ellipsoid, oblate spheroid or bulk.
(2) lime powder, the requirement of fluorite powder degree are 0.1～3mm, and wherein granularity requires less than 30% greater than the particle (wt%) of 2mm.
Dephosphorizing agent of the present invention has high basicity, high CaO activity, low melting point and characteristics cheaply, and dephosphorizing agent slagging speed is fast in the actual use, and basicity of slag and dephosphorization effect are all comparatively stable, and lime, ore consumption reduce remarkable in economical benefits significantly.
Know-why of the present invention
The key problem of converter dephosphorization pretreatment technology is the thermodynamics and kinetics condition that how to obtain quick dephosphorization; Thermodynamics, the dynamic conditions of reduction decarburization are effectively avoided too much decarburization dephosphorization the time.The thermodynamic condition of dephosphorization of molten iron is suitable basicity of slag, suitable low temperature and slag oxygen gesture; Dynamic conditions is then realized by promoting the molten bath to stir.
Theoretical and production practice show, the basicity of slag of one of thermodynamic condition of dephosphorization of molten iron (CaO/SiO2) is stablized and reached at 2.0～2.3 o'clock, and molten iron after the dephosphorization pre-treatment [P] can be stable less than 0.03%.The hot metal pretreatment temperature is generally 1300～1360 ℃, under this temperature condition, with lime, ore slagging process as slag making materials, basicity of slag only can reach 1.3～1.6, must pass through as auxiliary flux with addition of a certain amount of fluorite, promote the lime slagging, realize the requirement of dephosphorization technology for basicity of slag.But, because the restriction of lime lumpiness, still having part lime can't slagging, the slagging rate of converter dephosphorization pre-treatment lime only can reach 60%～70% in the actual production, therefore, the actual add-on of lime can surpass theoretical add-on 20%～30%, so in a large number not slagging lime not only cause the wasting of resources but also improved the pre-treatment cost, the economic benefit of pretreatment technology is reduced.
In order to improve the slagging effect of dephosphorization of molten iron preprocessing process lime, various dephosphorizing agent products are developed in succession, comprise pre-molten calcium ferrite, cold fixed dephosphorating pellet etc., and for satisfying the pretreated processing requirement of converter dephosphorization, dephosphorizing agent should have following characteristic:
(1) fusing point is low, and slagging speed is fast;
(2) CaO content height is active high;
(3) raw materials cost is cheap, production technique is simple;
(4) reduce the consumption of pre-treatment slag charge, save processing cost.
The converter dry dedusting technology produces a large amount of dedusting ash in steelmaking process, the dedusting ash main component is Fe
2O
3, FeO, CaO, MgO and SiO
2, as the waste that steelmaking process produces, how scientific and reasonable being used realizes that in the STEELMAKING PRODUCTION link circulation is significant for supplementary material.
The dephosphorizing agent hemispherical temperature is to detect the important indicator of its slagability, and hemispherical temperature is low, and fusing point is low, and slagging speed is fast, studies show that when hemispherical temperature is lower than 100～150 ℃ of hot metal pretreatment temperature, can guarantee that dephosphorizing agent has good slagging state.Research dephosphorizing agent component can find that to the influence of its hemispherical temperature CaO is with (Fe in the dephosphorizing agent component (Wt%)
2O
3+ FeO+CaF
2) ratio with hemispherical temperature relation as Fig. 1, as CaO/ (Fe
2O
3+ FeO+CaF
2) value is at 1.0～3.0 o'clock, the dephosphorizing agent hemispherical temperature can be stabilized in below 1200 ℃, shows can satisfy the slagging requirement when dephosphorizing agent component is in this scope.
CaO/ (Fe as shown in Figure 1
2O
3+ FeO+CaF
2) with the relation of dephosphorizing agent hemispherical temperature, the same SiO of CaO in the dephosphorizing agent component (wt%)
2Ratio with hemispherical temperature relation as Fig. 2, work as CaO/SiO
2Value is at 9～16 o'clock, and the dephosphorizing agent hemispherical temperature can be stabilized in below 1200 ℃, shows can satisfy the slagging requirement when dephosphorizing agent component is in this scope.
Description of drawings
Fig. 1 is CaO/ (Fe
2O
3+ FeO+CaF
2) with the graph of a relation of dephosphorizing agent hemispherical temperature.
Fig. 2 is CaO/SiO
2Graph of a relation with the dephosphorizing agent hemispherical temperature.
Embodiment
The composition range of dephosphorizing agent according to the present invention has carried out dephosphorizing agent production and practical application test.The converter dedusting ash accounts for 45% of total mass in the dephosphorizing agent raw material, and active lime powder accounts for 45%, and the fluorite powder accounts for 10%, and dephosphorizing agent finished product composition sees Table 1, and the practical application test is to carry out in the 500kg medium-frequency induction furnace, has carried out conventional slag former simultaneous test simultaneously.
Table 1 dephosphorizing agent composition/%
| CaO | Fe 2O 3 | FeO | CaF 2 | SiO 2 | Al 2O 3 | MgO |
| 50.88 | 21.36 | 14.09 | 8.50 | 4.28 | 1.21 | 3.72 |
With the 200kg pig iron 500kg medium-frequency induction furnace of packing into, induction furnace has the function of simulation top blast, bottom blowing top-bottom blowing.After on-test, the rifle oxygen blast is fallen, the slag charge that adds steel scrap simultaneously and be pre-mixed, and slag charge is block lime, dephosphorizing agent, first slag charge is 30% of total slag charge, adds the residue slag charge subsequently in batches, and the bottom blown gas flow is adjusted to set(ting)value.
Dephosphorizing agent test carrying out altogether 5 stoves use lime, dephosphorizing agent slag making pattern, and consumption is lime: 10～15kg/t, dephosphorizing agent: 15～25kg/t; Carry out conventional slag making dephosphorization experiment 5 stoves simultaneously, used lime, ore, fluorite slag making pattern, lime: 25kg/t～35kg/t, ore consumption is 15kg/t～25kg/t, fluorite consumption is 5kg/t～10kg/t.Comparative test result such as table 2,3.
Dephosphorizing agent (N=5) is used in the pre-treatment of table 2 dephosphorization of molten iron
Conventional slag former (N=5) is used in the pre-treatment of table 3 dephosphorization of molten iron
Claims (4)
1. one kind is the molten iron dephosphorization agent of raw material with converter dry method dust ash, it is characterized in that,
The heavy percentage ratio of the chemical ingredients of dephosphorizing agent is: CaO content 45～65%, ferriferous oxide content 15～35%, CaF
2Content 5～15%, SiO
2Content 2～6%; Ferriferous oxide is Fe
2O
3+ FeO;
Form simultaneously and need satisfy CaO/ (Fe
2O
3+ FeO+CaF
2)=1.0～3.0, CaO/ (SiO
2)=9～16;
The hemispherical temperature of dephosphorizing agent finished product is 1100～1200 ℃.
2. molten iron dephosphorization agent according to claim 1 is characterized in that, dephosphorizing agent raw material sources and consisting of: converter dry method dust ash content 20～60%, quickened lime powder content 20～60%, fluorite powder content 5～20%; The percentage ratio of all attaching most importance to.
3. molten iron dephosphorization agent according to claim 2 is characterized in that, the lime powder composition requires CaO 〉=80%; The fluorite meal component requires CaF
2〉=80%, moisture requirement is less than 1.5%, the percentage ratio of all attaching most importance to; Raw material blending is after cold pressing forming process, and finished product is ellipsoid, oblate spheroid or bulk.
4. molten iron dephosphorization agent according to claim 1 is characterized in that, it is 0.1～3mm that lime powder, fluorite powder degree require, wherein granularity greater than the particle requirement of 2mm less than 30 weight %.
Priority Applications (1)
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|---|---|---|---|
| CN2010105370079A CN102010933A (en) | 2010-11-05 | 2010-11-05 | Molten iron dephosphorization agent manufactured by using converter dry-method dust-removal ash as raw material |
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|---|---|---|---|
| CN2010105370079A CN102010933A (en) | 2010-11-05 | 2010-11-05 | Molten iron dephosphorization agent manufactured by using converter dry-method dust-removal ash as raw material |
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|---|---|
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Family
ID=43841261
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103014237A (en) * | 2012-12-14 | 2013-04-03 | 首钢总公司 | Dephosphorization slag forming constituent and production method thereof |
| CN103160647A (en) * | 2013-02-26 | 2013-06-19 | 首钢总公司 | Oxidization dephosphorization agent outside furnace, and preparation and using methods thereof |
| CN103320575A (en) * | 2013-03-19 | 2013-09-25 | 江苏省镔鑫特钢材料有限公司 | Molten-steel desulphurization dephosphorization treatment agent and preparation method |
| CN104357615A (en) * | 2014-11-25 | 2015-02-18 | 北京首钢国际工程技术有限公司 | Dephosphorization method for molten iron in converter by blowing dust removal ash |
| CN104498671A (en) * | 2014-12-09 | 2015-04-08 | 内蒙古包钢钢联股份有限公司 | Cold bonding dephosphorization fluxes for steelmaking and preparation method of cold bonding dephosphorization fluxes |
| CN105063279A (en) * | 2015-08-17 | 2015-11-18 | 河北钢铁股份有限公司承德分公司 | Method for using rotary furnace reclaimed dust for assisting semisteel dephosphorization pretreatment |
| CN105603147A (en) * | 2016-03-08 | 2016-05-25 | 唐山钢铁集团有限责任公司 | Converter slag forming process for rapid slagging |
| CN106591540A (en) * | 2016-12-20 | 2017-04-26 | 河钢股份有限公司承德分公司 | Semi-steel dephosphorization agent and semi-steel dephosphorization method |
| CN106967864A (en) * | 2016-01-14 | 2017-07-21 | 武汉科技大学 | A kind of production method of novel liquid steel dephosphorization slag former |
| CN108220529A (en) * | 2016-12-13 | 2018-06-29 | 鞍钢股份有限公司 | Molten iron desiliconization agent using sintering machine head electric dedusting ash as base body |
| CN111826499A (en) * | 2020-06-30 | 2020-10-27 | 东北大学 | A blast furnace molten iron decarburization treatment method based on converter LT dust removal |
| CN114231684A (en) * | 2021-12-23 | 2022-03-25 | 上海盛宝冶金科技有限公司 | High-efficiency molten iron pretreatment desulfurizer and preparation method thereof |
| CN115572792A (en) * | 2022-10-21 | 2023-01-06 | 河南少林特材有限公司 | Dephosphorization method and application |
| CN115612785A (en) * | 2022-10-31 | 2023-01-17 | 西安建筑科技大学 | A steelmaking dephosphorization agent prepared from electric arc furnace dust removal ash and its preparation method and application |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103014237A (en) * | 2012-12-14 | 2013-04-03 | 首钢总公司 | Dephosphorization slag forming constituent and production method thereof |
| CN103160647A (en) * | 2013-02-26 | 2013-06-19 | 首钢总公司 | Oxidization dephosphorization agent outside furnace, and preparation and using methods thereof |
| CN103320575A (en) * | 2013-03-19 | 2013-09-25 | 江苏省镔鑫特钢材料有限公司 | Molten-steel desulphurization dephosphorization treatment agent and preparation method |
| CN104357615A (en) * | 2014-11-25 | 2015-02-18 | 北京首钢国际工程技术有限公司 | Dephosphorization method for molten iron in converter by blowing dust removal ash |
| CN104357615B (en) * | 2014-11-25 | 2016-01-20 | 北京首钢国际工程技术有限公司 | A kind of converter winding-up dedusting ash dephosphorization method for molten iron |
| CN104498671A (en) * | 2014-12-09 | 2015-04-08 | 内蒙古包钢钢联股份有限公司 | Cold bonding dephosphorization fluxes for steelmaking and preparation method of cold bonding dephosphorization fluxes |
| CN105063279A (en) * | 2015-08-17 | 2015-11-18 | 河北钢铁股份有限公司承德分公司 | Method for using rotary furnace reclaimed dust for assisting semisteel dephosphorization pretreatment |
| CN106967864A (en) * | 2016-01-14 | 2017-07-21 | 武汉科技大学 | A kind of production method of novel liquid steel dephosphorization slag former |
| CN105603147A (en) * | 2016-03-08 | 2016-05-25 | 唐山钢铁集团有限责任公司 | Converter slag forming process for rapid slagging |
| CN108220529A (en) * | 2016-12-13 | 2018-06-29 | 鞍钢股份有限公司 | Molten iron desiliconization agent using sintering machine head electric dedusting ash as base body |
| CN106591540A (en) * | 2016-12-20 | 2017-04-26 | 河钢股份有限公司承德分公司 | Semi-steel dephosphorization agent and semi-steel dephosphorization method |
| CN111826499A (en) * | 2020-06-30 | 2020-10-27 | 东北大学 | A blast furnace molten iron decarburization treatment method based on converter LT dust removal |
| CN111826499B (en) * | 2020-06-30 | 2021-12-03 | 东北大学 | Blast furnace molten iron decarburization treatment method based on converter LT fly ash |
| CN114231684A (en) * | 2021-12-23 | 2022-03-25 | 上海盛宝冶金科技有限公司 | High-efficiency molten iron pretreatment desulfurizer and preparation method thereof |
| CN115572792A (en) * | 2022-10-21 | 2023-01-06 | 河南少林特材有限公司 | Dephosphorization method and application |
| CN115572792B (en) * | 2022-10-21 | 2023-12-19 | 河南少林特材有限公司 | Dephosphorization method and application |
| CN115612785A (en) * | 2022-10-31 | 2023-01-17 | 西安建筑科技大学 | A steelmaking dephosphorization agent prepared from electric arc furnace dust removal ash and its preparation method and application |
| CN115612785B (en) * | 2022-10-31 | 2024-01-26 | 西安建筑科技大学 | Steelmaking dephosphorization agent prepared from electric arc furnace dust removal ash, and preparation method and application thereof |
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Application publication date: 20110413 |