摘要
首钢迁钢公司和首秦公司大规模采用了"留渣+双渣"转炉炼钢新工艺,大幅度减少了炼钢渣量和石灰、白云石消耗。文章介绍了其中所开发的3项重要技术:①脱磷阶段采用低碱度(w(CaO)/w(SiO2)∶1.3～1.5)和低MgO质量分数(≤7.5%)渣系,形成流动性良好和适度泡沫化炉渣,解决了脱磷阶段结束难以快速足量倒渣和渣中金属铁质量分数高这两大问题;②针对脱磷阶段底吹搅拌弱问题,采用了低枪位和高供氧强度吹炼方法,利用顶吹氧气流加强金属熔池搅拌,获得了良好脱磷效果;③通过加快生产速度,特别是对"炼钢-精炼-连铸"生产合理组织调配,在转炉冶炼时间增加大约4min情况下,钢产量并没有减少。
The ＂Slag-Remaining＋ Double-Slag＂ BOF steelmaking technology has been developed and applied on a large scale in Qianan Steelworks and Shouqin Steelworks of Shougang Corporation Ltd. As the result, the lime con- sumption and the slag generated in BOF steelmaking have been remarkably decreased. In this paper, three important measures taken in application of the new steelmaking technology are introduced： ① To solve the two most serious problems, i.e. difficult to make fast and especially enough amount of deslagging and decrease the amount of the metallic Fe droplets in the slag, low basicity （w（CaO）/w（Si02） ： 1.3-1.5） and low MgO （≤7.5%） slag is used in the dephosphorization stage. ②Hard blow pattern （low oxygen lance position and high O2 flow rate） is adopted to take use of the top blown 02 jet to strengthen the agitation of the bath in the dephosphorization stage, through which good dephosphorization has been obtained. ③By speeding up the operations and particularly by optimize the control and matching of the steelmaking, secondary refining and continuous casting, the output of the steel has not been reduced though the BOF tap to tap time has been increased by about 4min after using the new technology.
出处
《中国冶金》
CAS
2013年第4期40-46,共7页
China Metallurgy
关键词
转炉炼钢
少渣
石灰消耗
脱磷
炉渣
BOF steelmaking
less slag
lime consumption
dephosphorization
slag
