Sulfurization Roasting Process of NdO and Synthetic NdFeO with Ferric Sulfate
Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science, ISSN: 1073-5615, Vol: 52, Issue: 4, Page: 2151-2162
2021
- 4Citations
- 9Captures
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Article Description
The environmental and economic recovery of rare-earth (RE) from NdFeB magnet waste is becoming increasingly important. In this study, the sulfurization possibility of two main RE-bearing phases of NdO and NdFeO in the fully oxidized NdFeB waste by ferric sulfate was evaluated. TG-DTA curves of the NdO and NdFeO sulfurization with 1.5 times of the theoretical Fe(SO)·5HO dosage showed that the temperatures range of Nd(SO) formation were 873 K to 963 K, and the starting temperature of Nd(SO) decomposition was ~ 1070 K. Specific experiments revealed by XRD and SEM-EDS analysis that NdO and NdFeO phases were successfully sulfated by Fe(SO)·5HO. The optimum roasting temperature was determined to be 973 K corresponding to the highest Nd leaching efficiency by the sulfurization of NdO. At above 973 K, the decomposition of Nd(SO) resulted in the decrease of Nd leaching efficiency. Furthermore, the required roasting time and Fe(SO)·5HO dosage to obtain the same Nd leaching efficiency were different for the sulfurization of NdO and NdFeO at 973 K, and the sulfurization of NdFeO was more difficult than that of NdO. Based on the results, an innovative method for recovering RE from NdFeB magnet waste was proposed.
Bibliographic Details
Springer Science and Business Media LLC
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