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Refining method for producing low alloy steel by refining and slagging of bauxite in LF (Ladle Furnace)

A low-alloy steel and bauxite technology, which is applied in the field of metallurgical refining outside the furnace, can solve the problems of short fluxing time of fluorite slag, increase the cost of refractory materials in iron and steel enterprises, and failure of fluorite fluxing, and achieve green The effect of polluting low-cost steelmaking production, conducive to rapid formation and reducing steelmaking costs

Active Publication Date: 2014-04-09
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional LF refining process uses a large amount of fluorite as a flux, because the main component of fluorite is CaF 2 , so that it has the characteristics of low melting point and low melting point eutectic substance with CaO and calcium silicate; however, fluorite will react with various oxides in slag to generate fluorine-containing gas, which will seriously pollute the environment, corrode equipment and damage Personnel are healthy, and with the volatilization of fluorine-containing gas, the slag fluxing effect of fluorite will gradually fail, so the slag fluxing effect of fluorite is short, which is not conducive to the stability of slag and affects the smooth operation of smelting
In addition, the slag containing CaF2 will cause certain damage to the refractory material of the ladle, reduce the service life of the ladle, and increase the refractory cost of the iron and steel enterprises

Method used

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  • Refining method for producing low alloy steel by refining and slagging of bauxite in LF (Ladle Furnace)
  • Refining method for producing low alloy steel by refining and slagging of bauxite in LF (Ladle Furnace)

Examples

Experimental program
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Effect test

Embodiment 1

[0037]The steel grade is ∮12mm HRB400, and the process route is: converter—LF refining—billet continuous casting machine. During the tapping process of the converter, bauxite, lime and silicon carbide are used to make refining pre-melted slag, and the lime used is 3.2kg. / ton of steel, bauxite is 2.1kg / ton of steel, silicon carbide is 1kg / ton of steel, the temperature of molten steel after tapping is 1581°C, and the slag in the ladle is completely melted without agglomeration. 1537°C, the slag thickness is 56mm, the amount of slag is relatively small, the additional lime is 1.5kg / ton steel, the bauxite is 0.75kg / ton steel, the silicon carbide is 0.4kg / ton steel, and the silicon calcium powder is 0.2kg / ton / ton Steel, calcium carbide is 0.8kg / ton / steel, use the ladle bottom blower to stir the slag evenly, lower the electrode temperature, raise the electrode when the temperature reaches 1560, measure the temperature and take samples to observe the slag condition, add silicon calc...

Embodiment 2

[0039] The steel grade is ∮12mm HRB400, and the process route is: converter—LF refining—billet continuous casting machine. During the tapping process of the converter, bauxite, lime and silicon carbide are used to make refining pre-melted slag, and the lime used is 3.5kg. / ton of steel, bauxite is 2.3kg / ton of steel, silicon carbide is 1kg / ton of steel, the temperature of molten steel after tapping is 1578°C, and the slag in the ladle is completely melted without agglomeration. 1543°C, the slag thickness is 52mm, the amount of slag is too small, add lime 2kg / ton steel, bauxite 1kg / ton steel, silicon carbide 0.5kg / ton steel, silicon calcium powder 0.2kg / ton / steel, Calcium carbide is 0.8kg / ton / steel, use ladle bottom blowing to stir the slag evenly, lower the electrode temperature, raise the electrode when the temperature reaches 1560, measure the temperature and take samples to observe the state of the slag, add silicon calcium powder again at 0.2kg / ton / steel , calcium carbide...

Embodiment 3

[0041] The steel grade is ∮16mm HRB400, and the process route is: converter—LF refining—billet continuous casting machine. During the tapping process of the converter, bauxite, lime and silicon carbide are used to make refining pre-melted slag, and the lime used is 4.1kg. / ton of steel, bauxite is 3.2kg / ton of steel, silicon carbide is 1.5kg / ton of steel, the temperature of molten steel after tapping is 1571°C, the slag in the ladle is completely melted and there is no agglomeration phenomenon, and the LF refining station measures the temperature The temperature is 1529℃, the slag thickness is 81mm, and the amount of slag meets the requirements. Only use silicon-calcium powder at 0.2kg / ton / steel, and calcium carbide at 0.6kg / ton / steel. Use ladle bottom blowing to stir the slag evenly. When the temperature reaches 1560, lift the electrode, measure the temperature and take samples to observe the slag condition, add silicon-calcium powder again at 0.2kg / ton / steel, and calcium car...

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Abstract

The invention relates to a refining method for producing low alloy steel by refining and slagging of bauxite in an LF (Ladle Furnace), in particular to a method for producing the low alloy steel by refining and slagging of bauxite ore after being crushed and dried in the LF, and belongs to the technical field of metallurgical ladle refining. The refining method adopts the following technical scheme: the refining method comprises the steps as follows: carrying out refining and slagging in the LF by using lime as a slag material, the bauxite as a fluxing agent, and silicon carbonate, calcium carbide and silicon-calcium powder as auxiliary materials; and adjusting the slag content of the LF to reduce the slag melting point by Al2O3 and SiO2 in the bauxite ore during refining and slagging in the LF. The bauxite as the fluxing agent used in the refining method has better use performance than the conventional fluorite fluxing agent, and meanwhile, the refining method achieves the effect of green pollution-free low-cost steel-making production and has remarkable economic and social benefits and promotional value. The ratio of Al2O3, CaO and other slag components can be effectively controlled by the bauxite with rich Al2O3 as a natural mineral, so that the steel-making cost can be remarkably reduced and the market competitiveness of an enterprise can be improved to extend the survival development space.

Description

technical field [0001] The invention relates to a refining method for producing low-alloy steel by using bauxite for LF refining and slag production, especially a production method for LF refining of low-alloy steel by using bauxite ore after crushing and drying in LF refining , belongs to the technical field of refining outside the metallurgical furnace. Background technique [0002] At present, iron and steel enterprises need to reduce pollution to the surrounding environment and reduce costs as much as possible during production. From the perspective of iron and steel enterprises' own development, low cost is also an important goal of their market competitiveness. The traditional LF refining process uses a large amount of fluorite as a flux, because the main component of fluorite is CaF 2 , so that it has the characteristics of low melting point and low melting point eutectic substance with CaO and calcium silicate; however, fluorite will react with various oxides in sla...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/076
CPCY02P10/20
Inventor 温春普房志琦国富兴韩春良张志新康毅
Owner HEBEI IRON AND STEEL