EXTRACTION OF RARE-EARTH ELEMENTS FROM HARD MATERIALS CONTAINING RARE-EARTH METALS

文件类型：PDF文档
文件大小：302K
FIELD : metallurgy. SUBSTANCE : proposed method comprises acid leaching of solid materials ground to at least 100 mcm by the mix of sulphuric and nitric acids at their ratio of 6 : 1 to 1 : 1 parts by weight and concentration of the mix of acids lower than 15 wt % and F : S ratio varying from 2 : 1 to 6 : 1 parts by weight. At acid leaching vacuum-pulse effects are applied during the entire process of rare-earth elements conversion into solution and precipitation of remained solid material. Obtained precipitate of solid fossil and man-made materials is separated from leaching solution. Separation of rare-earth elements from leaching solution is performed with the help of ion-exchange or membrane filter. EFFECT : simplified process, higher yield. 3 cl, 2 tbl, 2 ex