| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for recovering a valued composition from rare earth element-containing substances which can obtain the powdered valued composition recyclable as a sintered body raw material by the incorporation of a proper conditioning alloy without separation/purification into each constituent element simple substance. SOLUTION: In this recovery method, rare earth element-containing substances are crushed, acid-pickled, and dried to obtain a valued composition. Or, the crushed substances are reduced with calcium, the produced calcium oxide and the residual calcium are removed by washing with water, and the product is dried to obtain the valued composition. Or, the crushed substances, after being acid-pickled, are reduced with calcium, the produced calcium oxide and the residual calcium are removed by washing with water, and the product is dried to obtain the valued composition. Or, the acid-pickled crushed substances are reduced with calcium, the produced calcium oxide and the residual calcium are removed by washing with water, and the product is dried to obtain the valued composition. Or, the acid-pickled crushed substances are reduced with calcium, the produced calcium oxide and the residual calcium are removed by washing with water, the product is acid pickled again and dried to obtain the valued composition. |
