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From the waste liquid containing rare earth element method of recovering rare earth oxide 发明授权

2023-01-04 3090 78K 0

专利信息

申请日期 2025-07-11 申请号 JP2003162302
公开(公告)号 JP4248937B2 公开(公告)日 2009-04-02
公开国别 JP 申请人省市代码 全国
申请人 Showa Denko KK2004
简介 PROBLEM TO BE SOLVED : To provide a method of efficiently recovering a rare earth oxide with high purity from a grinding waste liquid containing a rare earth element by a simple process. SOLUTION : The rare earth oxide is recovered from the waste liquid containing the rare earth element by a process containing following steps (1)-(6). (1) The rare earth element is dissolved in a liquid by mixing the liquid containing the rare earth element with an acid and heating. (2) An undissolved material is removed from the resultant rare earth element solution. (3) A soluble carbonate or hydrogen carbonate or oxalic acid is added to the resultant solution to turn the rare earth element in the solution to rare earth carbonate or rare earth oxalate. (4) The rare earth carbonate or the rare earth oxalate is separated from the resultant slurry and is (5) fired and (6) recovered as the rare earth oxide. COPYRIGHT : (C)2004, JPO


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