高硅Fe-Si-Ni熔体还原脱磷反应动力学  

Kinetics of reductive dephosphorization reaction for high-silicon Fe-Si-Ni melt

作　　者：储少军[1] 陈佩仙 韩培伟 路明莹 CHU Shao-jun;CHEN Pei-xian;HAN Pei-wei;LU Ming-ying(State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China;Journal Publishing Center,University of Science and Technology Beijing,Beijing 100083,China;State Key Laboratory of Multiphase Complex Systems,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China;Party School of the CPC Bayannaoer City Committee,Bayannaoer 015000,Nei Mongol,China)

机构地区：[1]北京科技大学钢铁冶金国家重点实验室,北京100083 [2]北京科技大学期刊中心,北京100083 [3]中国科学院过程工程研究所多相复杂系统国家重点实验室,北京100190 [4]中共巴彦淖尔市委员会党校,内蒙古巴彦淖尔015000

出　　处：《中国冶金》2021年第5期26-31,46,共7页China Metallurgy

摘　　要：基于电硅热法生产300系列不锈钢镍、铬铁合金基料工艺开发,着重研究高硅Fe-Si-Ni熔体的还原脱磷问题。试验证明,Fe-Si-Ni熔体的脱磷率主要取决于熔体中的硅含量,固态脱磷渣的物相结构检测表明,磷元素在渣中的存在形式不仅有Ca_(3)P_(2)简单组分,还存在Ca_(4)SiP_(4)和Ca_(10+x)Si_(12-2x)P_(16)等复杂组分。提出了Fe-Si-Ni熔体还原脱磷过程发生"回磷"现象的反应机理,根据试验数据给出了10 kg感应炉的脱磷宏观反应动力学公式通式为dw([P])/dt=-Aw([P])+Bt(A、B为经验常数)。对于沉淀脱磷(SiCa合金作为脱磷剂,CaO-CaF_(2)为吸附渣),其宏观反应动力学公式为[%P]=0.101e^(-0.101t)+1.06×10^(-4)t^(2)-0.0301([%P]表示合金中磷的质量分数w([P])乘以100,t表示脱磷时间)。对于界面脱磷(CaO_((饱和))-CaF_(2)为脱磷渣),其宏观反应动力学公式为[%P]=0.113e^(-0.113t)+7.76×10^(-5)t^(2)+0.001 43。The behavior and kinetics of reductive dephosphorization(de-P) reaction for high-silicon Fe-Si-Ni melt was studied, which was one important part for developing a thermal-silicon reduction method to produce the nickel and chromium-iron based alloy for 300 series stainless steel production. The results showed that the de-P rate of Fe-Si-Ni melt mainly depends on the silicon content of the alloy melt, and the X-ray diffraction(XRD) analysis indicates that not only Ca_(3)P_(2) but also Ca_(10+x)Si_(12-2x)P_(16) and Ca_(4)SiP_(4) existed in the de-P slag. Besides, the mechanism of "rephosphorization" phenomenon in the de-P experiment for high-silicon Fe-Si-Ni melt was proposed. According to the experimental data, the kinetic formula of dephosphorization reaction in 10 kg induction furnace is given as dw([P])/dt =-Aw([P]) + Bt,(A and B were the empirical constants). For precipitation dephosphorization(SiCa alloy as dephosphorization agent, CaO-CaF_(2) as adsorption slag), the macro reaction kinetics formula was [%P] = 0.101 e^(-0.101t)+1.06×10^(-4)t^(2)-0.030 1([%P] was the mass fraction of phosphorus in the alloy w([P]) multiplied by 100, t was dephosphorization time). For interfacial dephosphorization(CaO(saturated)-CaF_(2) was dephosphorization slag), the macro reaction kinetic formula was [%P] = 0.113 e^(-0.113t)+ 7.76×10^(-5)t^(2)+0.001 43.

关 键 词：还原脱磷 不锈钢 高硅Fe-Si-Ni 反应动力学 Ca_(4)SiP_(4)和Ca_(10+x)Si_(12-2x)P_(16) 

分 类 号：TF645[冶金工程—钢铁冶金]