Preparation of FeCl3·6H2O from NdFeB secondary waste slag by acid leaching-extraction method
For the recovery of large amounts of iron in NdFeB secondary waste slag,an acid leaching-extraction process was employed to prepare FeCl3·6H2O.Single factor experiments,thermodynamic and kinetic research were used to optimize the acid leaching conditions,achieving a leaching rate of Fe3+exceeding 91%.A systematic study was conducted on the selective extraction performance of the LIU extractant towards Fe3+in the hydrochloric acid wet leaching processing.After the three-stage cross-current extraction,the extraction rate of Fe3+reached 98.78%,while other impurity ions were basically not extracted and retained in the raffinate.Distilled water was used for stripping.The stripping rate of Fe3+reached 99.88%after the two-stage cross-current stripping.The products were characterized by ICP-OES,XRD,and SEM.The results showed that the product purity was over 99.8%,and the net profit exceeded 1 200 CNY/ton.Compared with other recycling processes,this technology forms a closed cycle with low costs and short duration,thereby providing an effective scheme for the treatment of secondary waste.
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