CN102251075A - Refined, rapid and deep desulfurizing agent and preparation method of same - Google Patents
Refined, rapid and deep desulfurizing agent and preparation method of same Download PDFInfo
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- CN102251075A CN102251075A CN2011102407714A CN201110240771A CN102251075A CN 102251075 A CN102251075 A CN 102251075A CN 2011102407714 A CN2011102407714 A CN 2011102407714A CN 201110240771 A CN201110240771 A CN 201110240771A CN 102251075 A CN102251075 A CN 102251075A
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- passivation
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention provides a refined, rapid and deep desulfurizing agent which comprises the following components: 50%-59% of passivated lime, 20%-30% of passivated Al, 1%-5% of SiO2, 3%-8% of MgO, 1%-3% of Na2O, 3%-6% of BaO and the balance of inevitable impurities, wherein the content, particle size and activity of CaO in the passivated lime are not smaller than 93%, not greater than 1.5mm and not smaller than 310ml respectively; purity and particle size of aluminum in the passivated Al are not smaller than 98% and 50-100 meshes respectively; and the purity and particle size of the Na2O and BaO are not smaller than 98.5% and 50-100 meshes respectively. In the invention, the application of CaF2 is prevented, so that pollution on the environment is reduced. In addition, the desulfurizing agent provided by the invention has the advantages of simplicity in preparation process, low cost and good effect.
Description
Technical field
The present invention relates to the steelmaking technical field of ferrous metallurgy technology, relate in particular to external refining and carry out dark sulfur removal technology and sweetening agent thereof.
Background technology
Sulphur is harmful element in most of steel grades, except indivedual free-cutting steels, the sulfide inclusion that forms can reduce the ductility and the toughness of steel, and simultaneously, the steel resistance to corrosion that sulphur content is high reduces greatly, welding property to steel is also unfavorable, the harm of pipe line steel maximum when hydrogen is induced crackle, and produce the gap between sulfide inclusion and the steel, make it to become the responsive source that hydrogen is induced crackle, therefore, reduce sulphur content in the steel to the performance that improves just this with to reduce defective most important.Therefore a lot of steel grades need be reduced to sulphur content the level even lower that requires, and therefore, cooperate the deep desulfurizer of development of new when developing a kind of refining desulfuration technology.In recent years, the user requires more and more higher to the purity of steel, the demand of ultralow-sulfur steel constantly increases, particularly Ultra-low carbon, the high grade electric steel of super low sulfur, the anti-hydrogen of super low sulfur lure the smelting technology of new steel grades such as crackle high-grade pipe line steel, high-strength steel suddenly to wait to develop, the dark desulfurization technology of molten steel plays a part to become more and more important in whole steelmaking process, and the development of deep desulfurizer that is applied to ultra low-carbon steel is particularly important.The dark sulfur removal technology of molten steel a large amount of intensive researchs have been carried out both at home and abroad.Can find by retrieval, the deep desulfurizer material that adopts has a variety of at present, as Chinese patent CN02139690.6 sweetening agent and manufacturing process, a kind of novel sweetening agent and manufacturing process thereof that can be used for molten iron or molten steel desulfurizing disclosed, mainly form by sulphophile agent, reductor, heat-generating agent, soda acid and fusing point conditioning agent, reaction promotor, reaction product stablizer and binding agent, prescription is complicated especially, and wherein binding agent can cause carburetting significantly when refining Ultra-low carbon molten steel; CNOZ120744.5 and CN98101510.7 are pre-melted desulfurizing agents and preparation method thereof, must handle through fritting, make complicated, power consumption, and the sweetening power that can reduce sweetening agent is handled in fritting; CN01110080.X discloses a kind of iron and steel composite desulfurizing agent, and carbide of calcium can cause carburetting significantly when refining Ultra-low carbon molten steel; CN03117518.X is a kind of heating efficient desulfurizing agent, and contain carbide of calcium and yellow soda ash also easily cause cause carburetting significantly when refining Ultra-low carbon molten steel main the composition.200610047101.X be a kind of deep desulfurizer and manufacture method that is used for refining ultra-low-carbon steel, say so and use sweetening effectiveness better, but carry out EQUILIBRIUM CALCULATION FOR PROCESS by oxide compound to iron in aluminium content in its material and the Ultra-low carbon slag, the oxide compound of the basic not enough reduced iron of its aluminium amount, therefore, under high oxidisability condition, can not finish dark desulfurization; In addition, add ingredient requirement too strict according to it; Contain 1%～3% fluorite in sweetening agent, country has prohibited at steelmaking process and has used fluorite; Also contain 0.5%～1.2% Fe2O3, must reduce the utilization ratio of aluminium; Material variety is various, and it is numerous and diverse to prepare burden; This sweetening agent use range is too narrow, only is only applicable to the ultra low-carbon steel desulfurization.
Goal of the invention
The objective of the invention is shortcoming at above-mentioned sweetening agent existence, sweetening agent of the present invention need not fritting and handles, and adopts the separately activity of Passivation Treatment assurance sweetening agent in manufacturing processed, utilizes the thermopositive reaction of Al powder when refining desulfuration is handled, can realize rapid slag, reach desulfurization rapidly.The present invention stops to use CaF2, has reduced the pollution to environment.In addition, sweetening agent manufacture craft of the present invention is simple, and cost is low, effective.
Summary of the invention
Purpose of the present invention is exactly to have various problems at above-mentioned sweetening agent, discloses a kind of deep desulfurizer and the manufacture method that the dark desulfurization of various molten steel is handled, problem that exists when solving above-mentioned sweetening agent and desulfurization of being used for.
In order to address the above problem, the present invention by the following technical solutions:
1, a kind of refining fast and deep desulfurization agent composition is:
1) by weight percentage: passive lime: 50%-59%, passivation Al:20%～30%, SiO
2: 1%～5%, MgO:3%～8%, Na
2O:1%～3%, BaO:3%-6%, all the other are inevitable impurity.
2) wherein: CaO content 〉=93% in the passive lime, granularity≤1.5mm, activity 〉=310ml; Purity 〉=98% of passivation aluminium aluminium, granularity are 50～100 orders; Na
2O, BaO purity 〉=98.5%, granularity are 50～100 orders.
2, the manufacture method of above-mentioned refining fast and deep desulfurization agent is:
1) required various materials are machined to require granularity;
2) to the lime passivation that atomizes, the thickness of passive film is the 6-8 micron, carries out drying treatment after the passivation;
3) will be worked into the aluminum shot that requires granularity and carry out passivation, the thickness of passive film is the 6-8 micron, carries out drying treatment after the passivation;
4) lime after the passivation and aluminum shot and other material are required mechanical mixing in proportion;
5) double-layer seal moisture sealed packing.
Embodiment
The invention will be further described below in conjunction with embodiment:
Prepare the sweetening agent of the described component of table 1, its composition mass percent is:
Table 1 deep desulfurizer scheme
Such scheme is pressed following prepared
1) various materials are machined to require granularity, CaO content 〉=93% in the passive lime wherein, granularity≤1.5mm, activity 〉=310ml; Passivation aluminium purity 〉=98%, granularity are 50～100 orders; Na
2O, BaO purity 〉=98.5%, granularity are 50～100 orders.。
2) pulverize after, with the lime passivation that atomizes, the thickness of passive film is the 6-8 micron, carries out drying treatment after the passivation;
3) will be worked into the aluminum shot that requires granularity and carry out passivation, the thickness of passive film is the 6-8 micron, carries out drying treatment after the passivation;
4) above-mentioned material is required mechanical mixing in proportion.
5) packing adopts double-layer seal moisture sealed packing.
The present invention carries out dark desulfurization processing at 120tRH stove and 120tLF stove, is the 9kg/t steel in the RH add-on, carries out the test of 6 stoves altogether; In the LF add-on is the 7kg/t steel, carries out the test of 6 stoves altogether; Concrete outcome sees Table 2.
Wherein 1～3 what adopt is the sweetening agent of scheme 1 among the RH embodiment, and 4～6 what adopt is the sweetening agent of scheme 2; What 1～3 among the LF embodiment adopted is the sweetening agent of scheme 3, and 4～6 what adopt is the sweetening agent of scheme 4; Table 2 sweetening effectiveness
As can be seen, sulfur removal technology of the present invention is simple to operate, and sweetening effectiveness is stable, just sulphur can be taken off under the condition that does not influence rhythm of production to below 0.0010% even lower.And the present invention is under the situation of not using fluorite as fusing assistant, by reasonable adjustment slag system ingredient and an amount of Na of interpolation
2O, BaO flux, and need not fritting and handle, and have realized rapid slag, reach the effect of desulfurization rapidly, have reduced the pollution to environment.
Claims (3)
1. refining fast and deep desulfurization agent is characterized in that components based on weight percentage is: passive lime: 50%-59%, passivation Al:20%～30%, SiO
2: 1%～5%, MgO:3%～8%, Na
2O:1%～3%, BaO:3%～6%, all the other are inevitable impurity.
2. refining fast and deep desulfurization as claimed in claim 1 agent is characterized in that: CaO content 〉=93% in the described passive lime, granularity≤1.5mm, activity 〉=310ml; The purity of passivation aluminium 〉=98%, granularity are 50～100 orders; Na
2O, BaO purity 〉=98.5%, granularity are 50～100 orders.
3. the preparation method of a refining fast and deep desulfurization as claimed in claim 1 agent is characterized in that:
(1). required various materials are machined to require granularity;
(2). to the lime passivation that atomizes after the processing, the thickness of passive film is the 6-8 micron, carries out drying treatment after the passivation;
(3). will be worked into the aluminum shot that requires granularity and carry out passivation, the thickness of passive film is the 6-8 micron, carries out drying treatment after the passivation;
4) lime after the passivation and aluminum shot and other material are required to carry out mechanical mixing in proportion;
5) adopt double-layer seal moisture sealed packing.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102407714A CN102251075A (en) | 2011-08-22 | 2011-08-22 | Refined, rapid and deep desulfurizing agent and preparation method of same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2011102407714A CN102251075A (en) | 2011-08-22 | 2011-08-22 | Refined, rapid and deep desulfurizing agent and preparation method of same |
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| CN102251075A true CN102251075A (en) | 2011-11-23 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050056120A1 (en) * | 2003-09-15 | 2005-03-17 | Flores-Morales Jose Ignacio | Desulphurization of ferrous materials using sodium silicate |
| CN101016577A (en) * | 2007-02-15 | 2007-08-15 | 沈阳东北大学冶金技术研究所有限公司 | Passivation composite desulfurization powder |
| CN101096721A (en) * | 2006-06-27 | 2008-01-02 | 鞍钢股份有限公司 | Deep desulfurizing agent for refining ultra-low carbon steel and manufacturing method thereof |
| CN102041353A (en) * | 2009-10-23 | 2011-05-04 | 攀钢集团钢铁钒钛股份有限公司 | Desulfurizer, preparation method thereof and desulfurization method adopting desulfurizer |
| CN102051443A (en) * | 2010-12-31 | 2011-05-11 | 昆明理工大学 | High basicity fluorine-free RH (Ruhrstah-Heraeus) desulfurizer |
-
2011
- 2011-08-22 CN CN2011102407714A patent/CN102251075A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050056120A1 (en) * | 2003-09-15 | 2005-03-17 | Flores-Morales Jose Ignacio | Desulphurization of ferrous materials using sodium silicate |
| CN101096721A (en) * | 2006-06-27 | 2008-01-02 | 鞍钢股份有限公司 | Deep desulfurizing agent for refining ultra-low carbon steel and manufacturing method thereof |
| CN101016577A (en) * | 2007-02-15 | 2007-08-15 | 沈阳东北大学冶金技术研究所有限公司 | Passivation composite desulfurization powder |
| CN102041353A (en) * | 2009-10-23 | 2011-05-04 | 攀钢集团钢铁钒钛股份有限公司 | Desulfurizer, preparation method thereof and desulfurization method adopting desulfurizer |
| CN102051443A (en) * | 2010-12-31 | 2011-05-11 | 昆明理工大学 | High basicity fluorine-free RH (Ruhrstah-Heraeus) desulfurizer |
Non-Patent Citations (1)
| Title |
|---|
| 时启龙: "RH用少氟或无氟脱硫剂的开发", 《中国优秀博硕士学位论文全文数据库（硕士）（工程科技I辑）》 * |
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Application publication date: 20111123 |