CN103215408B - A kind ofly add the method that slag block carries out converter steelmaking - Google Patents
A kind ofly add the method that slag block carries out converter steelmaking Download PDFInfo
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Abstract
Invention belongs to metallurgical technology field, relates to and a kind ofly adds the method that slag block carries out converter steelmaking, is specifically related to a kind ofly add the method that the low slag iron and steel of iron-holder carries out converter steelmaking.The present invention adds the method that slag block carries out converter steelmaking, comprise charging, deoxidation alloying step in oxygen supply smelting and ladle, in the raw material that every stove adds, the weight of molten iron and slag block is as follows: molten iron 55-58 part, slag block 2-4 part, unslaked lime 1.5-2.0 part, light dolomite 0.65-0.8 part; Controlling basicity of slag during smelting is between 2.6 ~ 3.3.Adopt this slag steel to produce steel as cooling material, both can reduce steel-making cost, the steel that P and S content is qualified can also be obtained, and decrease the treatment capacity of slag simultaneously, decrease environmental pollution, and reduce environmental protection cost.Also take full advantage of iron resources, avoid the wasting of resources.
Description
Technical field
Invention belongs to metallurgical technology field, relates to and a kind ofly adds the method that slag block carries out converter steelmaking, is specifically related to a kind ofly add the method that the low slag iron and steel of iron-holder carries out converter steelmaking.
Background technology
The comprehensive utilization technique of metallurgical slag is widely used.At present, the method of comprehensive utilization of metallurgical slag is a lot, the most frequently used method is: metallurgical slag is carried out magnetic separation, obtain the higher iron-bearing material of Fe content (i.e. slag iron and steel), obtain the raw material (or making pelletizing) of some strength and granularity through sintering, adopt cupola furnace or blast furnace to smelt, obtain molten iron, smelt through converter → refining furnace (i.e. ladle refining furnace) → vacuum refining furnace again, finally obtain steel.The advantage of the method is: the rate of recovery of iron is high, and steel can reach technical requirements; But it is long that the method exists Production Flow Chart, energy consumption is high, P and S content is high and unstable, the shortcomings such as inclusion content is many.
Patent CN101713013A discloses a kind of method adopting steel slag to produce steel, adds unslaked lime 10 ~ 18kg in slag iron and steel per ton, adds coke 6 ~ 10kg in slag iron and steel per ton.Iron level >=60% in the slag steel adopted in this invention.All≤0.015%, steel low power and metallographic examination all reach national I level level to [S] and [P] content of the steel that this invention adopts the method for steel slag to produce steel to produce.At present in converter steelmaking, the slag steel or the gold-plating iron that add iron level >=60% are widely used in the process of converter steelmaking, but this technology slag making materials consumes more, and cost is higher.
The slag produced in steel-making usually need to transport do it with or dispose, a kind of cost in transportation cost Ye Shi steel mill operation cost, if can gather materials on the spot, turns waste into wealth, also can reduce production and operation cost.
Adopt slag smelting iron and steel high-quality steel difficulty larger.Major cause is that the chemical composition of slag iron and steel is unstable, and particularly phosphorus, sulphur content fluctuate larger.
Summary of the invention
The above-mentioned technical problem of the present invention in order to solve, provides a kind of slag iron and steel adopting iron-holder low to carry out the method for converter steelmaking, adopts this slag steel to produce steel as cooling material, both can reduce steel-making cost, and can also obtain the steel that P and S content is qualified.
The present invention adds the method that slag block carries out converter steelmaking, comprise charging, deoxidation alloying step in oxygen supply smelting and ladle, it is characterized in that, in the raw material that every stove adds, the weight of molten iron and slag block is as follows: molten iron 55-58 part, slag block 2-4 part, unslaked lime 1.5-2.0 part, light dolomite 0.65-0.8 part; Controlling basicity of slag during smelting is between 2.6 ~ 3.3.
Wherein, in order to make full use of resource, the iron level in above-mentioned slag block is 25-35%.Above-mentioned slag block granularity is 15 ~ 35mm.Unslaked lime granularity is 15 ~ 35mm.
Slag block of the present invention is that copper smelter slag obtains through magnetic separation.The slag block of these magnetic separation is inherently elected from slag, returns in converter and participates in smelting, can play adjustment temperature, promote the effect of smeltingization slag, do not affect the quality of steel and the structure of steel.In addition, the metal of nearly about 30% can also be extracted from clinker, thus reach the object reducing steel technology, reduce costs.
Further, in order to make the better quality of produced steel and make full use of resource, raw material when filling with substance of the present invention also adds iron block or gold-plating iron, and the weight of the iron block added or gold-plating iron and molten iron is 0-5:55-58.
Iron level >=60% in above-mentioned gold-plating iron.
In routine techniques, when regulating smelting process temperature, entirely regulate smelting process temperature by increase lime, light dolomite amount, basicity of slag is up to 3.6-4.6, and the present invention adds slag block as cooling material, and basicity of slag can be reduced between 2.6-3.3.Basicity of slag reduces, and can reduce the consumption of Wingdale, reduce the amount of slag simultaneously, reduces metal wastage, cost-saving.
Hot metal in steelmaking, when silicon content of hot metal is 0.4% time, do not add slag block as slag making materials, every stove steel needs to add slag making materials lime 2.5-3t, light dolomite 1.5-2t.After adding slag block, every stove steel needs to add slag making materials lime 1.5-2t, light dolomite 0.65-0.8t.Every stove steel is than few lime about the 1t not adding slag block, light dolomite 0.85-1.2t.The market price of current lime is at about 1400 yuan/about t, and the market price of light dolomite, at about 270 yuan/t, deducts the cost of other steel slag magnetically dressing, the cost-saved 1000-1200 unit of every stove steel.
The present invention add steel [S] that method that slag block carries out converter steelmaking produces and [P] content equal≤0.010-0.015%.Steel low power and metallographic examination all reach national I level level.
Slag block of the present invention is gathered materials on the spot exactly, adopts copper smelter slag to obtain through magnetic separation, does not increase any installations and facilities and energy consumption, decrease treatment capacity and the processing costs of slag simultaneously, decrease environmental pollution, reduce environmental protection cost.Realizing, to the utilization of waste material of slag steel, taking full advantage of iron resources, avoiding the wasting of resources simultaneously, for provides the art a kind of selection newly, having broad application prospects.
Embodiment
Below in conjunction with specific embodiment, the present invention is further described, so that those skilled in the art more understands the present invention, but does not therefore limit the present invention.
Embodiment 1-4
Be raw material with copper smelter slag, through magnetic separation, obtain slag block, adopt following method to smelt this slag block and other raw material such as molten iron, lime, the weight proportion of each raw material is in table 1.
Note: the slag block granularity in table 1 is 15 ~ 35mm, and lime granularity is 15 ~ 35mm, and in slag block, iron level is 25-35%.
(1) feed: turndown, adds iron block or gold-plating iron, slag block, hot metal charging, shake positive body of heater to vertical position;
(2) oxygen supply is smelted: fall rifle and open and blow, add 1/2 or 2/3 of lime and light dolomite total amount, oxygen supply intensity is 2.5-4.5m simultaneously
3/ t
.min; Add remaining lime and light dolomite continuation blowing after 3 ~ 5min, carry out with blowing, in steel, carbon reduces gradually, and after about 12min, flame is faint, reaches temperature and the composition of steel grade requirement, carries rifle blow off; Then fall stove: measure liquid steel temperature, sampling real-time analysis [C], [S], [P] content, when temperature and composition meet the requirements, tapping;
(3) deoxidation alloying in ladle: when molten steel go out to total amount four/for the moment, carry out deoxidation, reach steel grade to the demand in steel,
(4) one heat steel is smelted complete thus
After testing, in the steel produced [P] and [S] content all≤0.010%, the low power of steel and metallographic are mingled with inspection and reach the requirement of national I grade standard.
Comparative example
Note: the lime granularity in table 2 is 15 ~ 35mm.
(1) feed: turndown, adds iron block or gold-plating iron, hot metal charging, shakes positive body of heater to vertical position;
(2) oxygen supply is smelted: fall rifle and open and blow, add 2/3 of lime and light dolomite total amount, oxygen supply intensity is 2.5-4.5m simultaneously
3/ t
.min; Add remaining lime and light dolomite continuation blowing after 3 ~ 5min, carry out with blowing, in steel, carbon reduces gradually, and after about 12min, flame is faint, reaches temperature and the composition of steel grade requirement, carries rifle blow off; Then fall stove: measure liquid steel temperature, sampling real-time analysis [C], [S], [P] content, when temperature and composition meet the requirements, tapping;
(3) deoxidation alloying in ladle: when molten steel go out to total amount four/for the moment, carry out deoxidation, reach steel grade to the demand in steel;
(4) one heat steel is smelted complete thus.
After testing, in the steel produced [P] and [S] content all≤0.015%, the low power of steel and metallographic are mingled with inspection and reach the requirement of national I grade standard.
Claims (3)
1. one kind adds the method that slag block carries out converter steelmaking, comprise charging, deoxidation alloying step in oxygen supply smelting and ladle, it is characterized in that, in the raw material that every stove adds, the weight of molten iron and slag block is as follows: molten iron 55-58 part, slag block 2-4 part, unslaked lime 1.5-2.0 part, light dolomite 0.65-0.8 part; Controlling basicity of slag during smelting is between 2.6 ~ 3.3;
Iron level in described slag block is 25-35%;
Described slag block granularity is 15 ~ 35mm;
Described unslaked lime granularity is 15 ~ 35mm.
2. according to claim 1ly add the method that slag block carries out converter steelmaking, it is characterized in that, raw material when filling with substance also adds iron block or gold-plating iron, and the weight of the iron block added or gold-plating iron and molten iron is 0-5:55-58.
3. according to claim 2ly add the method that slag block carries out converter steelmaking, it is characterized in that, iron level >=60% in described gold-plating iron.
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109371193A (en) * | 2018-12-10 | 2019-02-22 | 攀枝花钢城集团有限公司 | The method that converter slag is used for pneumatic steelmaking |
| CN113699371B (en) * | 2021-07-19 | 2022-10-25 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Preparation and use methods of composite deoxidation modified pellets |
| CN114606404A (en) * | 2022-03-09 | 2022-06-10 | 石横特钢集团有限公司 | Method for producing manganese-silicon alloy by using steel slag to replace light-burned dolomite |
| CN114854930A (en) * | 2022-05-12 | 2022-08-05 | 河北荣信钢铁有限公司 | Cold slag slagging agent for converter steelmaking and use method thereof |
| CN115807145B (en) * | 2022-11-28 | 2024-03-08 | 天津钢铁集团有限公司 | Control method for adjusting temperature by utilizing tailings |
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| CN101173323A (en) * | 2007-11-13 | 2008-05-07 | 攀钢集团成都钢铁有限责任公司 | Multifunctional slagging material findings and method for producing the same |
| CN101463406A (en) * | 2007-12-20 | 2009-06-24 | 鞍山钢铁集团公司 | Converter fluxing medium with LF refinery cinder as raw material and production method thereof |
| CN101713013A (en) * | 2009-12-23 | 2010-05-26 | 攀枝花钢城集团瑞钢工业有限公司 | Method for using steel slag to produce steel |
| CN102181588A (en) * | 2011-03-22 | 2011-09-14 | 重庆中渣冶金再生资源有限公司 | Method for recycling refined casting residues during steelmaking in steel plant |
| CN102676726A (en) * | 2012-05-08 | 2012-09-19 | 首钢总公司 | Smelting process capable of utilizing converter slag fully |
| CN103031401A (en) * | 2012-09-26 | 2013-04-10 | 新疆八一钢铁股份有限公司 | Method for converter steelmaking by LF (Ladle Furnace) refining furnace reducing slag |
| CN103031399A (en) * | 2012-05-31 | 2013-04-10 | 新疆八一钢铁股份有限公司 | Method for converter slagging regulation production |
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- 2013-04-28 CN CN201310154281.1A patent/CN103215408B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101173323A (en) * | 2007-11-13 | 2008-05-07 | 攀钢集团成都钢铁有限责任公司 | Multifunctional slagging material findings and method for producing the same |
| CN101463406A (en) * | 2007-12-20 | 2009-06-24 | 鞍山钢铁集团公司 | Converter fluxing medium with LF refinery cinder as raw material and production method thereof |
| CN101713013A (en) * | 2009-12-23 | 2010-05-26 | 攀枝花钢城集团瑞钢工业有限公司 | Method for using steel slag to produce steel |
| CN102181588A (en) * | 2011-03-22 | 2011-09-14 | 重庆中渣冶金再生资源有限公司 | Method for recycling refined casting residues during steelmaking in steel plant |
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