Study on Rare Earth Selective Leaching from Cerium-rich NdFeB Waste by Oxidation Roasting with Hydrochloric Acid at High Temperature
According to the characteristics of high cerium content in cerium-rich NdFeB waste,the rare earth in NdFeB waste was recovered by oxidation roasting-hydrochloric acid solution method,and the phase change of the waste high-tempera-ture roasting and the hydrochloric acid leaching conditions were studied.The XRD analysis results of the oxidized calcined ma-terial shows that the phase composition of the oxidized calcined material is mainly Fe2O3,GdFeO3,NdBO3 and CeO2 at the calcination temperature of 800 ℃;The results of hydrochloric acid high temperature leaching show that when the leaching tem-perature is 110 ℃,the time is 30 min,the amount of hydrochloric acid(excluding CeO2)is 1.30 times the theoretical amount,and the concentration of hydrochloric acid is 10wt％,the maximum leaching rate of rare earth is 74.65％,and the main phase composition of the filter residue is Fe2O3 and CeO2,there is a small amount of cerium in the leaching solution of rare earth chloride;The results of hydrochloric acid high-temperature reduction leaching show that by adding FeCl2 reducing a-gent,under the same leaching conditions,the tetravalent cerium in the oxide material is reduced to trivalent and enters the leaching solution,and the leaching rate of rare earth can reach 95.88％.
cerium-rich neodymium iron boronoxidation roastingrare earth recoveryhydrochloric acid leachingFeCl2
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