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Extraction of Rare Earths from NdFeB Waste by Ultrasonic Enhanced Hydrochloric Acid Leaching Method
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Qi WU1, 2, Wenjun FAN1, 2, 3, Chengye ZHANG1, 2, Chengcheng ZHANG1, 2, Xiaowei ZHANG1, 2, 3, Zhongxing LIU1, 2, 3
Hydrometallurgy of China | 2026, 45(2) : 208 - 214
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Hydrometallurgy of China | 2026, 45(2): 208-214
• Experiment Research •
Extraction of Rare Earths from NdFeB Waste by Ultrasonic Enhanced Hydrochloric Acid Leaching Method
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Qi WU1, 2, Wenjun FAN1, 2, 3, Chengye ZHANG1, 2, Chengcheng ZHANG1, 2, Xiaowei ZHANG1, 2, 3, Zhongxing LIU1, 2, 3
Affiliations
  • 1.Institute of Rare Earth Industry(College of Rare Earth Engineering and Technology), Inner Mongolia University of Science and Technology, Baotou　014010, China
  • 2.Key Laboratory of Full-cycle Green Development & High-Efficiency Utilization of Light Rare-Earth Resources (Inner Mongolia University of Science and Technology), Baotou　014010, China
  • 3.Engineering Research Center of Inner Mongolia Autonomous Region, Baotou　014010, China
Published: 2026-04-20 doi: 10.13355/j.cnki.sfyj.2026.02.010
Outline
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To address the issues of long leaching time and high consumption of hydrochloric acid in the conventional hydrochloric acid leaching method for neodymium-iron-boron (NdFeB) waste, the ultrasonic-enhanced hydrochloric acid solubilization method was studied for the leaching of rare earths from it. The effects of ultrasonic power, hydrochloric acid concentration, temperature, liquid volume to solid mass ratio, leaching time, particle size and other factors on the leaching rate of rare earths were investigated, and the optimal leaching parameters were determined. The results show that ultrasonic assistance significantly enhances the leaching process. Under the optimal conditions of ultrasonic power of 60 W, hydrochloric acid concentration of 2 mol/L, temperature of 85 ℃, liquid volume to solid mass ratio of 10 mL/1 g, leaching time of 105 min, and particle size of -0.074 mm, the rare earth leaching rate reaches 97.94%, which is 8 percentage points higher than that of the conventional hydrochloric acid leaching method under its best conditions. The method is an efficient and feasible green process for rare earth recovery and provides a new approach for the resource utilization of NdFeB waste.

ultrasonic enhancement  /  NdFeB waste  /  hydrochloric acid solubilization method  /  rare earth  /  green and efficient  /  leaching
吴琦, 樊文军, 张成业, 张成成, 张晓伟, 刘中兴. 用超声强化盐酸优溶法浸出钕铁硼废料中的稀土. 湿法冶金, 2026 , 45 (2) : 208 -214 . DOI: 10.13355/j.cnki.sfyj.2026.02.010
Qi WU, Wenjun FAN, Chengye ZHANG, Chengcheng ZHANG, Xiaowei ZHANG, Zhongxing LIU. Extraction of Rare Earths from NdFeB Waste by Ultrasonic Enhanced Hydrochloric Acid Leaching Method[J]. Hydrometallurgy of China, 2026 , 45 (2) : 208 -214 . DOI: 10.13355/j.cnki.sfyj.2026.02.010
Appendix
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Year 2026 volume 45 Issue 2
137
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Article Info
doi: 10.13355/j.cnki.sfyj.2026.02.010
  • Receive Date：2025-10-27
  • Online Date：2026-09-28
  • Published：2026-04-20
Article Data
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History
  • Received：2025-10-27
  • Revised：2025-12-09
Funding
Affiliations
    1.Institute of Rare Earth Industry(College of Rare Earth Engineering and Technology), Inner Mongolia University of Science and Technology, Baotou　014010, China
    2.Key Laboratory of Full-cycle Green Development & High-Efficiency Utilization of Light Rare-Earth Resources (Inner Mongolia University of Science and Technology), Baotou　014010, China
    3.Engineering Research Center of Inner Mongolia Autonomous Region, Baotou　014010, 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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