PROCEDURE FOR PROCESSING GRINDING WASTES FROM MANUFACTURE OF PERMANENT MAGNETS

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FIELD : metallurgy. SUBSTANCE : invention refers to procedure of extraction of rare earth elements (REE) from grinding wastes of manufacture of permanent magnets. The procedure consists in dissolving grinding wastes in sulphuric acid, in extraction of double salts and sodium REE-Na by sedimentation and in washing double salts. Further, double salts are conversed in hydroxide of REE and hydroxides of REE are washed. Upon washing hydroxides of REE are oxalate conversed, dried and burned producing sum of REE oxides. After sedimentation of double salts of rare earth elements and sodium REE-Na mother solutions are processed producing ferriferous and cobalt cakes. EFFECT : production of sum of oxides REE with high content of REE by hydro-metallurgical procedure, production of ferriferous and cobalt concentrates as by-products. 4 cl, 1 dwg