不锈钢粉尘中FeCr_(2)O_(4)还原过程分解行为研究  

Study on Decomposition Behavior of FeCr_(2)O_(4) in Stainless Steel Dust during Reduction Process

作　　者：齐素慈[1] 李建朝[1] 许继芳[2,3] QI Su-ci;LI Jian-chao;XU Ji-fang(Department of Materials Engineering,Hebei College of Industry and Technology,Shijiazhuang 050091,China;State Key Laboratory of Advanced Special Steel,Shanghai University,Shanghai 200072,China;School of Iron and Steel,Soochow University,Suzhou 215137,Jiangsu,China)

机构地区：[1]河北工业职业技术学院材料工程系,石家庄050091 [2]上海大学省部共建高品质特殊钢冶金与制备国家重点实验室,上海200072 [3]苏州大学沙钢钢铁学院,江苏苏州215137

出　　处：《有色金属（冶炼部分）》2021年第4期14-21,共8页Nonferrous Metals（Extractive Metallurgy)

基　　金：国家自然科学基金资助项目(51704201);河北省高等学校科学研究计划青年基金项目(QN2020161);上海市科学技术委员会资助项目(19DZ2270200);河北工业职业技术学院自然科学项目(ZRY2017001);省部共建高品质特殊钢冶金与制备国家重点实验室、上海市钢铁冶金新技术开发应用重点实验室开放课题(SKLASS019-10)。

摘　　要：不锈钢粉尘还原过程中FeCr_(2)O_(4)分解对Cr的分离回收影响显著。对气体和固体碳还原FeCr_(2)O_(4)的热力学过程和分解特征进行研究,探讨Cr在还原过程中存在形式和还原分离条件。结果表明,CO气体和H_(2)在标准状态下不能还原FeCr_(2)O_(4),固体碳能将FeCr_(2)O_(4)还原为铬氧化物和铁氧化物,甚至还原成金属Cr和Fe。提高温度和降低体系总压可促进反应进行。温度1 000~1 200℃,配碳量为β=0.25~0.5时,还原产物主要为Cr_(2)O_(3)+Fe;温度>1 250℃,配碳量β>1.0时,还原产物主要为Cr+Fe;900℃时体系总压在0.01~0.001MPa还原产物主要为Cr_(2)O_(3)+Fe,低于0.5kPa时还原产物主要为Cr+Fe。Decomposition behavior of FeCr_(2)O_(4) during reduction of stainless steel dust has a significant impact on separation and recovery efficiency of Cr resources.Thermodynamic process and decomposition characteristics of reduction decomposition of FeCr_(2)O_(4) with gas and solid carbon were studied.Existence form of Cr element and reductive separation conditions during reduction were discussed.The results show that CO gas and H_(2) gas cannot reduce FeCr_(2)O_(4) at standard conditions.Solid carbon can reduce FeCr_(2)O_(4) to chromium oxide and iron oxide,and even reduce it to metallic Cr and metallic Fe,and both of rising of temperature and dropping of total pressure can promote reduction.With temperature of 1 000—1 200℃and carbon content of β=0.25—0.5,reduction products exist in form of Cr_(2)O_(3)+Fe;when reduction temperature is>1 250℃and carbon content isβ>1.0,reduction products exist in form of Cr+Fe;When system total pressure Pis in the range of 0.01—0.001MPa at 900℃,the products exist in form of Cr_(2)O_(3)+Fe,and exist in form of Cr+Fe when it is lower than 0.5kPa.

关 键 词：不锈钢粉尘 FeCr_(2)O_(4) 还原反应 分解行为 固体碳 

分 类 号：TF111.13[冶金工程—冶金物理化学]