Hydrometallurgical processing of Nd–Fe–B magnets for Nd purification

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• 作者：Ching-Hwa Lee ; Hsin-Yi Yen ; Ching-Hua Liao…
• 关键词：Neodymium magnet ; Hydrometallurgy ; pH adjustment ; Recovery ; Scrap
• 刊名：Journal of Material Cycles and Waste Management
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：19
• 期：1
• 页码：102-110
• 全文大小：
• 刊物类别：Earth and Environmental Science
• 刊物主题：Civil Engineering; Waste Management/Waste Technology; Environmental Management;
• 出版者：Springer Japan
• ISSN：1611-8227
• 卷排序：19

文摘

An evaluation of various metal purification processes subsequent to the leaching processing of the neodymium (Nd) product from neodymium–iron–boron (Nd–Fe–B) magnets has been conducted. These post-leaching purification processes included precipitation; replacement and electrolysis were studied in order to check the purity of the recovered neodymium. A hydrometallurgical investigation was adopted to digest the metal content of the scrap Nd–Fe–B magnets for the recovery of valuable Nd metal and other metals such as Fe, B, Co and Ni. The effect of leaching conditions such as solid-to-liquid ratio and temperature were optimized and 100 % Nd, 100 % Fe, 100 % B and 85.87 % Co leaching efficiencies were achieved under these conditions. The coating material of the magnet, Ni, achieved 50 % impregnation after increasing the reaction temperature to 70 °C. The metals present in the optimal leaching solution were recovered 99 % by pH adjustment. However, the replacement had the highest separation efficiency for the recovery of Nd metal. Further, the optimal leaching Nd–Fe–B solution was subjected to the electrolysis processes in order to verify the recovery efficiency for all metals.