转炉钢渣铝热还原回收有价元素热力学分析  

Thermodynamic analysis of recovering valuable elements from steel slag by thermite reduction in converter

作　　者：曹磊 石家豪 高宇宁 Cao Lei;Shi Jiahao;Gao Yuning(Department of Materials Engineering,Hebei Polytechnic University,Shijiazhuang 050091,Hebei,China;School of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063210,Hebei,China)

机构地区：[1]河北工业职业技术大学材料工程系,河北石家庄050091 [2]华北理工大学冶金与能源学院,河北唐山063210

出　　处：《钢铁钒钛》2023年第6期93-97,109,共6页Iron Steel Vanadium Titanium

基　　金：河北省高等学校科学技术研究项目(QN2022090);河北省高等学校科学技术研究项目资助(CXY2023004);河北省自然科学基金项目(E2021417001)。

摘　　要：针对转炉钢渣中铁、磷、锰及硅等有价元素的回收及钢渣资源化利用的问题,通过Factsage8.2软件热力学计算系统分析了转炉钢渣铝热还原回收有价元素的热力学条件和影响规律。结果表明,转炉钢渣的碱度对铝热还原回收FeO、P_(2)O_(5)、MnO的影响不大,提高转炉钢渣碱度有利于SiO_(2)的还原回收;温度变化对FeO、P_(2)O_(5)、MnO回收的影响也不大,但是温度升高不利于转炉钢渣中SiO_(2)的还原。当转炉钢渣碱度为3.18,温度为1873 K、w(Al/Slag)=20%时,铝热还原转炉钢渣回收有价元素的效果相对最佳,转炉钢渣中的FeO、P_(2)O_(5)、MnO、SiO_(2)的还原率高达100%、100%、99.97%、98.12%。这为转炉钢渣铝热还原回收有价元素及钢渣资源化利用提供重要的研究基础。Aiming at recovery of valuable elements such as Fe,P,Mn and Si from Bessemer steel slag and utilization of steel slag,the thermodynamic conditions and influencing rules of thermite reduction and recovery of valuable elements from Bessemer steel slag were analyzed by a Factsage8.2 software thermodynamic calculation system.The results show that basicity of the slag has little effect on the recovery of FeO,P_(2)O_(5) and MnO in thermite reduction,and the improvement of slag basicity is beneficial to SiO_(2) recovery.The change of temperature has little effect on the recovery of FeO,P_(2)O_(5) and MnO,but increasing temperature is not conducive to the reduction of SiO_(2) in the steel slag.When the slag basicity is 3.18 and the temperature is 1873K,w(Al/Slag)=20%,the recovery of valuable elements can be achieved the relatively best effect,and the reduction rates of FeO,P_(2)O_(5),MnO and SiO_(2) in the slag are as high as 100%,100%,99.97%and 98.12%,respectively.These studied results can be used for the efficient recovery of valuable elements and resource utilization of steel slag by thermite reduction.

关 键 词：转炉钢渣 铝热还原 有价元素 资源化利用 还原率 热力学 

分 类 号：X757[环境科学与工程—环境工程] TF633[冶金工程—钢铁冶金]