Research Status and Prospect of Rare Earth Recovery from Samarium Cobalt Permanent Magnetic Waste
Sm-Co rare earth permanent magnetic materials are widely used in new energy,electronic informa-tion and other special fields due to their excellent magnetic properties in harsh environments.When producing and using Sm-Co permanent magnet materials,a large amount of waste materials will be produced.Efficient re-covery of valuable metals from waste permanent magnets is of great significance for alleviating the shortage of strategic metal resources in China.For a long time,researchers have been committed to the research on the re-covery of Nd-Fe-B permanent magnet waste,and there is little research on the recovery of Sm-Co permanent magnet waste.Therefore,this paper summarizes the current recovery process of Sm-Co permanent magnet waste,and compares the advantages and disadvantages of wet processes such as hydrochloric acid preferential solution method,sulfuric acid double salt method,and acid precipitation method;The feasibility and economic benefits of pyrometallurgical processes such as chlorination and glass slag for recovering permanent magnet waste are analyzed.The limitations of electrodeposition,hydrogenation and remelting methods to recover Sm-Co permanent magnetic waste are introduced separately.The green and efficient recovery process of samarium co-balt permanent magnetic waste recovery technology and its possible development direction are also proposed.
Sm-Co permanent magnetic scraprare earthsecondary resource recoveryrecycling