| 简介 |
1. The method of processing of monatsitovykh concentrates, including preparation of charge from mixture of monazite concentrate with calcined soda and phosphorous removal thermal treatment of mixture and water treatment, characterized in that thermal treatment mixture is carried out in flow CO or H, or their mixture at temperature 750-850 °C with transition of iron in chemically inactive magnetite; after aqueous treatment with leaching soluble products defosforizatsii insoluble residue in the form of oxides of rare-earth metals is subjected to chlorination by treatment of ammonium chloride in reactor without oxygen access air at temperature 200-300 °C with branch ammonia and water vapors and obtaining of chlorides of rare-earth metals, which are in solution, from solution rare-earth metals is deposited in form of a oxalates or extracted. 2. Method according to Claim 1, characterized in that soda for defosforizatsii is obtained from by-products of chlorination and defosforizatsii and additional reagent NaCl. 3. Method according to Claim 1, characterized in that soluble products defosforizatsii is neutralized phosphoric acid for formation of trisodium phosphate. 4. Method according to Claim 1, characterized in that rare-earth metals from solution is extracted by tributyl phosphate. 5. Method according to Claim 4, characterized in that trisodium phosphate is obtained as commercial product. |
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