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Hydrochloric Acid Leaching Process of Rare Earth Polishing Powder Waste
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Xitao WU1, 2, Jie ZHANG1, Haiguo WU1, 2, Shengzhong XIE1, 2, Qingshan YANG1, 2, Mingxi JIANG1, 2
Mining and Metallurgical Engineering | 2023, 43(2) : 109 - 113
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Mining and Metallurgical Engineering | 2023, 43(2): 109-113
• METALLURGY •
Hydrochloric Acid Leaching Process of Rare Earth Polishing Powder Waste
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Xitao WU1, 2, Jie ZHANG1, Haiguo WU1, 2, Shengzhong XIE1, 2, Qingshan YANG1, 2, Mingxi JIANG1, 2
Affiliations
  • 1.Hunan Nonferrous Metals Vocational and Technical College, Zhuzhou 412006, Hunan, China
  • 2.Hunan Province Engineering Technology Research Center for Comprehensive Environmental Management of Mining Area, Changsha 410126, Hunan, China
Published: 2023-04-01 doi: 10.3969/j.issn.0253-6099.2023.02.025
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A hydrochloric acid leaching process was adopted to recover rare earth from rare earth polishing powder waste. The effects of hydrochloric acid concentration, leaching temperature, leaching time and liquid-solid ratio on the leaching rates of rare earth and main impurity Al2O3 were investigated, and the leaching mechanism was also discussed. It is found that the optimal conditions for single-stage leaching with HCl system are as follows: HCl concentration of 8 mol/L, leaching temperature of 80 ℃, leaching time of 3 h, and liquid-solid ratio of 4∶1. Under such conditions, the leaching rates of rare earth and Al2O3 are 90.81% and 43.68%, respectively．Based on the comparison of results from single-stage leaching, two-stage leaching and three-stage countercurrent leaching, it is shown that the leaching rate of rare earth by three-stage countercurrent leaching can be up to 98.38%. An increased amount of rare earth in the leaching solution is beneficial to the extraction and recovery of rare earth elements in the next step, thus greatly cutting recovery cost.

rare earth polishing powder waste  /  pretreatment  /  three-stage countercurrent leaching  /  mechanism analysis  /  rare earth  /  hydrochloric acid leaching
Xitao WU, Jie ZHANG, Haiguo WU, Shengzhong XIE, Qingshan YANG, Mingxi JIANG. Hydrochloric Acid Leaching Process of Rare Earth Polishing Powder Waste[J]. Mining and Metallurgical Engineering, 2023 , 43 (2) : 109 -113 . DOI: 10.3969/j.issn.0253-6099.2023.02.025
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doi: 10.3969/j.issn.0253-6099.2023.02.025
  • Receive Date：2022-09-03
  • Online Date：2026-03-05
  • Published：2023-04-01
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  • Received：2022-09-03
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Affiliations
    1.Hunan Nonferrous Metals Vocational and Technical College, Zhuzhou 412006, Hunan, China
    2.Hunan Province Engineering Technology Research Center for Comprehensive Environmental Management of Mining Area, Changsha 410126, Hunan, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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