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| Study on Decomposition Behavior of FeCr2O4 in Stainless Steel Dust during Reduction Process |
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Received:October 31, 2020
Revised:November 05, 2020
Accepted:November 10, 2020
Published Online:March 24, 2021
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| DOI：doi：10.3969/j.issn.1007-7545.2021.04.003 |
| KeyWord:stainless steel dust; FeCr2O4; reduction reaction; decomposition behavior, solid carbon |
| Author | Institution |
| QI Su-ci |
河北工业职业技术学院 |
| Li Jian-chao |
河北工业职业技术学院 |
| XU Ji-fang |
苏州大学 |
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| Download times: 1922 |
| 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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