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酒钢LF炉精炼工艺的优化
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摘要
酒钢LF炉当初是为处理事故钢水而设置的。自1997年投产以来,主要用来调整转炉钢水的温度和成分,并没有发挥其脱氧、脱硫的基本功能。本文旨在探索酒钢LF炉精炼效果的工艺途径,为今后酒钢开发超低硫品种钢提供依据。
     结合国内外转炉匹配LF炉的生产实践,针对酒钢LF炉的传统工艺缺陷,提出了合理的温度制度、吹Ar制度和造渣制度,并在酒钢LF炉上进行了优化工艺的试验。得到了平均脱氧率58.9%、脱硫率56.5%,平均∑[O]去除率64.3%的好效果。
     酒钢LF炉良好的造渣制度是选用良好的精炼渣系且加入量在900kg/炉左右,精炼后炉渣碱度平均在3.0左右:吹Ar制度是进站测温取样前氩气流量为5~8 m~3/h,加精炼渣料时吹氩量为20m~3/h;加热提温时吹氩量增为25~30m~3/h,合金微调时吹氩量降为18~20m~3/h,精炼结束氩气流量降至5~8m~3/h;升温时间应在16~32min,精炼周期在35min左右,功率尽可能大。
     优化试验得出:酒钢LF炉已具备发挥其精炼功能的条件,切实改进工艺制度,加强操作,酒钢LF炉同时脱氧、脱硫功能可以充分实现。
LF was initially built for dedling with unormal liquid steel. It was maily used in adjusting temperature and composition of steel from LD in Jiuquan Iron & Steel Cor.But deoxidation and desulphurization has been always much poor.For developing the new breed steel,the paper explored the technological way of refining effect in LF.
    On the basis of combing the production practice of home and abroad ,and traditional defect of Jiuquan Steel LF, The reasonable temperature, Ar-blowing and slag making system were provided in this paper. Industrial optimization tests indicated that the average deoxidation efficiency, desulphurization rate and average Equally ?[O] climating rate is 58.9%, 56.5% and 64.3%.respectively.
    Industrial tests indicated that the quantity of refining slag required is 900kg/per ladle, basicity after refining is about 3.0. Rational Ar-blowing process obtained in the study is that Ar flux should be about 5~8 m3/h before mearing temperature and sampling, 20m3/h in adding refining slag , and 25~30m3/h in heating, 18~20 m3/h in adding alloy, Small Ar flux should be controlled when refining was finished, which is 5~~8 m3/h. Heating time is 16~-32min, Average refining period is about 35min,Power is as high as possible.
    The conclusion can be drawn from the optimization experiment that LF of Jiuquan Iron & Steel Cor. Has had the capacity of refining. The functing of simultaneous deoxidation and desulphurization will be fally realized when the process was modified and operation was strengthened.
引文
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