Al_2O_3和Na_2O对高磷铁水脱磷的影响  

Effect of Al_2O_3 and Na_2O on Dephosphorization of High Phosphorus Hot Metal

作　　者：刁江[1,2] 

机构地区：[1]中冶赛迪工程技术股份有限公司炼钢事业部,重庆401122 [2]国家钢铁冶炼装备系统集成工程技术研究中心,重庆401122

出　　处：《钢铁研究学报》2013年第2期9-13,共5页Journal of Iron and Steel Research

基　　金：重庆市科技攻关重点项目(CSTC;2008AB4018);重庆市科技攻关项目(CSTC;2011AC7048)

摘　　要：在1 350℃,采用无氟CaO-FetO-SiO2渣系,以少量Na2O和Al2O3作助熔剂,对磷含量0.42%(质量分数,下同)的铁水进行了脱磷热力学试验。结果表明:Na2O和Al2O3含量分别为0.7%～3.1%和2.5%～7.9%时,脱磷率为81.4%～90.7%,lgLP为1.50～1.92,lgγP2O5在-15.6～-16.6之间,lgCP为19.9～20.5。脱磷率、lgLP和lgCP随Na2O含量的增加而增加。lgγP2O5随Na2O含量的增加而降低。Al2O3对脱磷效果的影响与Na2O正好相反。采用半球点法对CaO-Fe2O3-Na2O-Al2O3无氟脱磷剂进行了熔点测试。发现以Na2O和Al2O3作助熔剂均可使脱磷剂熔点降至1 200℃以下,满足高磷铁水转炉脱磷温度要求。Dephosphorization thermodynamics of high phosphorus hot metal（0.42%） at 1 350 ℃ was investigated by using CaO-FetO-SiO2 slags,which contained small amounts of Na2O and Al2O3.When the content of Na2O and Al2O3 is 0.7%-3.1% and 2.5%-7.9%,respectively.η,lgLP,lgγP2O5 and lgCP are in the range of 81.4%-90.7%,1.50-1.92,-15.6——16.6 and 19.9-20.5,respectively.η,lgLP and lgCP increases with the increasing of Na2O content.lgγP2O5 decreases with the increasing of Na2O content.However,Al2O3 content shows an opposite effect on dephosphorization.Melting temperatures of CaF2-free CaO-Fe2O3-Na2O-Al2O3 dephosphorization slag were measured by using hemisphere method.The results show that both Na2O and Al2O3 could decrease melting temperature to ≤1 200 ℃ to meet the requirement of high phosphorus hot metal dephosphorization in converter.

关 键 词：脱磷 高磷铁水 CaO-Fe2O3-Na2O-Al2O3 熔点 

分 类 号：TF704.4[冶金工程—钢铁冶金]