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有色金属(冶炼部分):2021,(4):14-21
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不锈钢粉尘中FeCr2O4还原过程分解行为研究
齐素慈1, 李建朝1, 许继芳2
(1.河北工业职业技术学院;2.苏州大学)
Study on Decomposition Behavior of FeCr2O4 in Stainless Steel Dust during Reduction Process
QI Su-ci1, Li Jian-chao2, XU Ji-fang
(1.Hebei College of Industry and Technology;2.河北工业职业技术学院)
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投稿时间:2020-10-31    修订日期:2020-11-05
中文摘要: 不锈钢粉尘还原过程中FeCr2O4分解对Cr的分离回收影响显著。对气体和固体碳还原FeCr2O4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H2气在标准状态下不能还原FeCr2O4,固体碳能将FeCr2O4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。温度为1 000~1 200 ℃,配碳量为β=0.25~0.5时,还原产物主要为Cr2O3+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0.01~0.001 MPa还原产物主要为Cr2O3+Fe,低于0.5 kPa时还原产物主要为Cr+Fe。
Abstract:Decomposition behavior of FeCr2O4 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 FeCr2O4 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 H2 gas cannot reduce FeCr2O4 at standard conditions. Solid carbon can reduce FeCr2O4 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 Cr2O3+Fe; when reduction temperature is >1 250 ℃ and carbon content is β>1.0, reduction products exist in form of Cr+Fe; When system total pressure P is in the range of 0.01—0.001 MPa at 900 ℃, the products exist in form of Cr2O3+Fe, and exist in form of Cr+Fe when it is lower than 0.5 kPa.
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基金项目: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)
引用文本:
齐素慈,李建朝,许继芳.不锈钢粉尘中FeCr2O4还原过程分解行为研究[J].有色金属(冶炼部分),2021(4):14-21.
QI Su-ci,Li Jian-chao,XU Ji-fang.Study on Decomposition Behavior of FeCr2O4 in Stainless Steel Dust during Reduction Process[J].Nonferrous Metals (Extractive Metallurgy),2021(4):14-21.

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