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| Study on Decomposition Behavior of Fe2NiO4 during Gas Reduction of Stainless Steel Dust |
| Received:November 14, 2020 Revised:November 20, 2020 |
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| DOI：doi：10.3969/j.issn.1007-7545.2021.05.004 |
| KeyWord:Fe2NiO4; stainless steel dust; reduction reaction; gas reduction; decomposition behavior |
| Author | Institution |
| LI Jian-chao |
河北工业职业技术学院 智能制造学院 |
| QI Su-ci |
河北工业职业技术学院 |
| XU Ji-fang |
苏州大学沙钢钢铁学院 |
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| Abstract: |
| Thermodynamic process and decomposition characteristics of reduction of Fe2NiO4 by CO and H2 gases were studied. Effects of gas composition and temperature on decomposition behavior and reduction products of Fe2NiO4 were discussed. The results show that CO and H2 gas can reduce Fe2NiO4 to nickel oxide and iron oxide, then reduction of iron oxide obeys a stepwise mechanism, and even directly reduce to metallic Ni and metallic Fe. Weight loss rate during reducing of Fe2NiO4 by CO-H2 mixed gas changes significantly with H2 content and temperature in mixed gas. When temperature is lower than 820 ℃, reducing ability of CO is stronger than that of H2, and weight loss rate drops gradually with increase of H2 content in mixed gas. When temperature is higher than 820 ℃, reducing ability of H2 is stronger than that of CO, and weight loss rate rises gradually with increase of H2 content. Amount of mixed gas required to completely reduce Fe2NiO4 to metal Ni and Fe is at least 4 times of theoretical value. |
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