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| Co-disposal Technology of Red Mud and Aluminum Electrolysis Solid Waste Based on External Thermal Reduction and Smelting Separation |
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Received:December 28, 2020
Revised:March 08, 2021
Accepted:March 08, 2021
Published Online:April 27, 2022
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| DOI： |
| KeyWord:red mud; waste cathode; anode toner; external heated reduction; co-disposal; smelting separation |
| Author | Institution |
| TANG En |
Zhejiang Industry&Trade Vocational College |
| ZHANG Rui |
Zhejiang Industry & Trade Vocational College |
| REN Zhi-jie |
Zhejiang Industry & Trade Vocational College |
| WANG Dan-dan |
Shandong Weiqiao Pioneering Group Co., Ltd. |
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| Abstract: |
| In large aluminum smelting enterprises solid wastes of red mud and waste cathodes is satisfied the basic elements requirements of the solid-solid direct reduction technology. Thus, it is proposed a solution to use the collaborative disposal of waste cathodes and red mud under indirect heating supply to produce pellets in order to utilize in situ. It is studied the reduction mechanism of red mud and waste cathode, the effect of carbon allocation method on pellet reduction and the analysis of the effect of subsequent smelting separation and product quality. Experiment results shows that the iron in red mud can be successfully reduced at high temperature by using waste cathode and anode toner. The metallization rate of iron in red mud can reach more than 95% and the quality of pellets is more favorable with external carbon mixing. The red mud pellets must be operated by briquetting or steel retention in order to carry out effective melting and separation of slag and iron. After separation, steel with iron content of 98.85% and carbon content of 0.13% can be obtained, and the yield of iron elements can reach more than 96%, the harmful components separated into the slag can be effectively solidified. The aluminide content in the slag reaches about 37% which can be added to the alumina purification process as a matching ore use. |
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