RH精炼工艺脱氮的影响因素
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摘要
通过对马钢120tRH精炼炉进行脱氮工艺试验,分析了钢水脱氮率与初始氮含量、真空度、循环次数以及渣层厚度之间的关系。试验结果表明,RH真空下的脱氮率受诸多工艺因素的相互共同制约,初始氮含量对脱氮率的影响呈现阶梯性的特点,低真空度是获得较高脱氮率的必要条件,循环次数保持在10~12次范围内,脱氮效果最佳。渣层厚度对脱氮有双重影响,应合理控制渣量,使RH渣层厚度避开130~150mm区间。
Based on the denitrification technology testing of 120 tRH at Masteel the relationships between denitrification rate and initial nitrogen content,cycle times,slag depth were analyzed.Results showed that denitrification rate and many process factors were mutual constraint in RH vacuum.Effect of the initial nitrogen content on the denitrification rate had the ladder-type characteristics.Low vacuum degree was the necessary condition to obtain higher denitrification rate,and denitrification effect achieved best when steel cycles remained within 10-12 times.RH slag depth had a dual effect on denitrification rate,so slag volume should be reasonable control avoiding from 130-150 mm intervals.
Based on the denitrification technology testing of 120 tRH at Masteel the relationships between denitrification rate and initial nitrogen content,cycle times,slag depth were analyzed.Results showed that denitrification rate and many process factors were mutual constraint in RH vacuum.Effect of the initial nitrogen content on the denitrification rate had the ladder-type characteristics.Low vacuum degree was the necessary condition to obtain higher denitrification rate,and denitrification effect achieved best when steel cycles remained within 10-12 times.RH slag depth had a dual effect on denitrification rate,so slag volume should be reasonable control avoiding from 130-150 mm intervals.
引文
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[3]傅杰.薄板坯连铸连轧钢中氮的控制[C]//薄板坯连铸连轧技术交流与开发协会第三次技术交流会论文集.唐山:薄板坯连铸连轧技术交流与开发协会,2005:94.
[4]蒋国昌.纯净钢及二次冶炼[M].上海:上海科学技术出版社,1996.
[5]刘浏.RH真空精炼工艺与装备技术的发展[J].钢铁,2006,41(8):8.
[6]唱鹤鸣.熔渣下钢液真空吹气脱氮的研究[D].北京:北京科技大学,1996.
[7]S Ban-Y F,Ishli.Rate of Nitrogen disorption from liguid ironchromium alloys with argon[J].Met Trans:B,1988,233:233.
[8]Rao Y K,Lee H G.Rate of nitrogen absorption in molten iron:Part I experimental[J].Iron and Steelmaking,1985,12(5):209.
[9]Rao Y K,Lee H G.Rate of nitrogen absorption in molten iron:Part II experimental[J].Iron and steelmaking,1985,12(5):221.
[10]项长祥,Gammal T El.钙基中性渣及氧化性渣覆盖时氮在钢液和气相间的传质[J].钢铁研究,1997(5):11.