摘要
从优化转炉留渣-双渣工艺脱磷效果的角度，通过热力学经验公式计算了炉渣碱度、FeO、MgO、MnO含量对1gLp（Lp磷在渣-钢中平衡分配比）的影响，确定脱磷阶段理论渣系控制范围是：R=1．5～2．5，w（FeO）=15％～25％，w（MgO）〈8％，w（MnO）〈10％。使用Factsage热力学软件计算得到了CaO-SiO2—FeO-MnO-MgO五元渣系液相线图，综合经验公式及液相线图计算结果，设计了一条留渣双渣工艺脱磷阶段理论计算成渣路线。该成渣路线的特点是：FeO含量高，碱度变化趋势为先由高到低，然后缓慢增加。生产实践表明，采用该成渣路线，转炉渣料消耗下降了22．7％，同时转炉冶炼终点脱磷率为92．2％，达到了降低渣料消耗与高效脱磷的双重目的。
In order to improve the dephosphorization effect during slag-remaning and double slag process, the influence of slag basicity and FeO,MgO and MnO content on lg Lp（Lp is the equilibrium distribution ratio of phosphorus in slag-steel）was calculated by thermodynamic empirical formula. The results indicated that the theoretical composition range of slag during dephosphorization process was that slag basicity 1.5 - 2.5, w （FeO） = 15 % - 25 %, w （MgO） 〈8 %, w （MnO） 〈 10 %. Liquidus diagram of CaO-SiO2-FeO-MnO-MgO slag systems was calculated by thermodynamic software Factsage. Theoretical calculate slag forming route was designed for dephosphorization stage during slag-remaining and double slag process with the comprehensive consideration of empirical formula and liquidus diagram calculate results. The characteristics of the slag forming route was that FeO content was high and the slag basicity changed from high to low and then increased slowly. The production practice results indicated that the consumption of slag material decreased by 22.7 % and dephosphorization rate reached 92.2 % at the end of converter steelmaking with this slag forming route. The experiment achieved the dual goals of decreasing slag material consumption and efficient dephosphorization.
出处
《炼钢》
CAS
北大核心
2016年第1期6-11,共6页
Steelmaking
关键词
留渣双渣
脱磷
成渣路线
slag-remaining and double slag process
dephosphorization
slag forming route
