Experimental Study on Hydrochloric Acid Leaching of Rare Earth from Melting Separation Slag of NdFeB Waste AITranslate
Abstract AITranslate
Multicomponent melting separation slag,obtained from NdFeB waste by H2 selective reduction and melting separation,was used as raw material for hydrochloric acid leaching.The influence of reaction factors on the leaching rate of rare earth under the conditions of low temperature and atmospheric pressure and high temperature and high pressure was investigated.And the kinetics of the leaching process was also analyzed.The experimental results show that the optimal leaching conditions at low temperature and atmospheric pressure are hydrochloric acid concentration of 2.84 mol/L,liquid-solid ratio of 10∶1,time of 60 minutes and temperature of 85℃,and the leaching rate of rare earth reaches 96.04%.The leaching process is controlled by a mixture of diffusion and chemical reactions,with an apparent activation energy of 29.25 kJ/mol,a preexponential factor of 2.0209 s-1,and reaction orders related to the hydrochloric acid concentration and particle size of 1.49 and-0.55,respectively.The optimal leaching conditions at high temperature and high pressure are hydrochloric acid concentration of 2.03 mol/L,liquid-solid ratio of 10∶1,time of 30 min and temperature of 110℃,and the leaching rate of rare earth reaches 98.13%.The reco-vered rare earth oxides mainly contain Pr4O7 and Nd2O3 with a purity of 99.56%.The leaching process is controlled by internal diffusion,with an apparent activation energy of 9.63 kJ/mol and a preexponential factor of 3.57×10-3s-1.
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Basic Information:
DOI：
Chinese Library Classification Number:TF845.6[冶金工程—有色金属冶金]
Citation Information:
Multicomponent melting separation slag,obtained from NdFeB waste by H2 selective reduction and melting separation,was used as raw material for hydrochloric acid leaching.The influence of reaction factors on the leaching rate of rare earth under the conditions of low temperature and atmospheric pressure and high temperature and high pressure was investigated.And the kinetics of the leaching process was also analyzed.The experimental results show that the optimal leaching conditions at low temperature and atmospheric pressure are hydrochloric acid concentration of 2.84 mol/L,liquid-solid ratio of 10∶1,time of 60 minutes and temperature of 85℃,and the leaching rate of rare earth reaches 96.04%.The leaching process is controlled by a mixture of diffusion and chemical reactions,with an apparent activation energy of 29.25 kJ/mol,a preexponential factor of 2.0209 s-1,and reaction orders related to the hydrochloric acid concentration and particle size of 1.49 and-0.55,respectively.The optimal leaching conditions at high temperature and high pressure are hydrochloric acid concentration of 2.03 mol/L,liquid-solid ratio of 10∶1,time of 30 min and temperature of 110℃,and the leaching rate of rare earth reaches 98.13%.The reco-vered rare earth oxides mainly contain Pr4O7 and Nd2O3 with a purity of 99.56%.The leaching process is controlled by internal diffusion,with an apparent activation energy of 9.63 kJ/mol and a preexponential factor of 3.57×10-3s-1.
quote
| GB/T 7714-2015 | [1] ZHOU Chang, DENG Yong-chun, WANG Liang, et al. Experimental Study on Hydrochloric Acid Leaching of Rare Earth from Melting Separation Slag of NdFeB Waste[J]. Rare Metals and Cemented Carbides, 2023(3): 5-12. |
| MLA | [1] ZHOU Chang, et al., "Experimental Study on Hydrochloric Acid Leaching of Rare Earth from Melting Separation Slag of NdFeB Waste." Rare Metals and Cemented Carbides, no. 3, 2023, pp. 5-12. |
| APA | [1] ZHOU Chang, DENG Yong-chun, WANG Liang, XIN Wen-bin, JIANG Yin-ju, & YUAN Lu. (2023). Experimental Study on Hydrochloric Acid Leaching of Rare Earth from Melting Separation Slag of NdFeB Waste. Rare Metals and Cemented Carbides(3), 5-12. |
| IEEE | [1] ZHOU Chang, DENG Yong-chun, WANG Liang, XIN Wen-bin, JIANG Yin-ju, and YUAN Lu, "Experimental Study on Hydrochloric Acid Leaching of Rare Earth from Melting Separation Slag of NdFeB Waste," Rare Metals and Cemented Carbides, no. 3, pp. 5-12, 2023. keywords: {NdFeB waste;melting separation slag;hydrochloric acid;leaching;rare earth recovery;kinetics} |