Study on the Recovery of Rare Earth from Dealuminated Slag of Waste Rare Earth Phosphor by Two-stage Acid Leaching AITranslate
Abstract AITranslate
With waste rare earth phosphor as the raw material after aluminum removal by acid leaching,caustic soda sintering and water washing,two-stage acid leaching and orthogonal experiment were used to optimize acid leaching conditions.The results show that the influence order of each factor on rare earth leaching in the first stage is as follows:liquid-solid ratio>HCl concentration>leaching time>leaching temperature>H2O2 dosage.Under the optimal conditions of solid-liquid Ratio of 6∶1,HCl concentration of 6 mol/L,leaching time of 60 min,leaching temperature of 60℃,and H2O2 dosage of 8%(volume fraction),the total rare earth leaching rate reaches 95.48%and the residual acid concentration is 2.18 mol/L,the concentration of Al impurity is up to 134 mmol/L,and Fe and Si are 1.78 mmol/L and 3.89 mmol/L,respectively.In the second stage,when the leaching temperature and time are 60℃and 60 min,and the pH value of the leaching solution is adjusted to 4 by adding fresh dealuminated slag,the concentration of Al,Fe and Si impurities in leaching solution is reduced to 24.1 mmol/L,<0.09 mmol/L and 3.89 mmol/L,meeting the requirements of subsequent extraction.
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DOI：
Chinese Library Classification Number:TF845[冶金工程—有色金属冶金]
Citation Information:
With waste rare earth phosphor as the raw material after aluminum removal by acid leaching,caustic soda sintering and water washing,two-stage acid leaching and orthogonal experiment were used to optimize acid leaching conditions.The results show that the influence order of each factor on rare earth leaching in the first stage is as follows:liquid-solid ratio>HCl concentration>leaching time>leaching temperature>H2O2 dosage.Under the optimal conditions of solid-liquid Ratio of 6∶1,HCl concentration of 6 mol/L,leaching time of 60 min,leaching temperature of 60℃,and H2O2 dosage of 8%(volume fraction),the total rare earth leaching rate reaches 95.48%and the residual acid concentration is 2.18 mol/L,the concentration of Al impurity is up to 134 mmol/L,and Fe and Si are 1.78 mmol/L and 3.89 mmol/L,respectively.In the second stage,when the leaching temperature and time are 60℃and 60 min,and the pH value of the leaching solution is adjusted to 4 by adding fresh dealuminated slag,the concentration of Al,Fe and Si impurities in leaching solution is reduced to 24.1 mmol/L,<0.09 mmol/L and 3.89 mmol/L,meeting the requirements of subsequent extraction.
quote
| GB/T 7714-2015 | [1] ZHU Shang-ping, ZHONG Li-qin, ZENG Yan-liang, et al. Study on the Recovery of Rare Earth from Dealuminated Slag of Waste Rare Earth Phosphor by Two-stage Acid Leaching[J]. Rare Metals and Cemented Carbides, 2019(6): 10-14. |
| MLA | [1] ZHU Shang-ping, et al., "Study on the Recovery of Rare Earth from Dealuminated Slag of Waste Rare Earth Phosphor by Two-stage Acid Leaching." Rare Metals and Cemented Carbides, no. 6, 2019, pp. 10-14. |
| APA | [1] ZHU Shang-ping, ZHONG Li-qin, ZENG Yan-liang, LI Zhen-yuan, & LIAO Chun-fa. (2019). Study on the Recovery of Rare Earth from Dealuminated Slag of Waste Rare Earth Phosphor by Two-stage Acid Leaching. Rare Metals and Cemented Carbides(6), 10-14. |
| IEEE | [1] ZHU Shang-ping, ZHONG Li-qin, ZENG Yan-liang, LI Zhen-yuan, and LIAO Chun-fa, "Study on the Recovery of Rare Earth from Dealuminated Slag of Waste Rare Earth Phosphor by Two-stage Acid Leaching," Rare Metals and Cemented Carbides, no. 6, pp. 10-14, 2019. keywords: {waste rare earth phosphor;dealuminated slag;orthogonal experiment;rare earth leaching;two-stage acid leaching} |