公开(公告)号：US4942024A

公开(公告)日：1990-07-17

申请号：US364081

申请日：1989-06-02

申请人： Hiromi Sasaki ,  Tadasi Tanaka ,  Yasusi Muneno

发明人： Hiromi Sasaki ,  Tadasi Tanaka ,  Yasusi Muneno

IPC分类号： C01G33/00 ,  C01G35/00 ,  C22B3/10 ,  C22B3/16 ,  C22B3/34

CPC分类号： C22B3/165 ,  C01G33/00 ,  C01G35/00 ,  C22B3/0031 ,  C22B3/10 ,  C01P2006/80 ,  Y02P10/234

摘要： Refining of either niobium hydroxide or tantalum hydroxide containing transition metals as impurities is accomplished easily and economically by dissolving the metal hydroxide in an aqueous solution of either hydrofluoric acid or oxalic acid, adjusting the pH of the solution to 1 to 4 and adding ammonium pyrrolidinedithiocarbamate (APDC) to the solution while maintaining the temperature of the solution below 60.degree. C. The addition of APDC causes the transition metals to simultaneously precipitate as coordination compounds. The minimum amount of APDC is 0.05 wt % of Nb.sub.2 O.sub.5 or Ta.sub.2 O.sub.5 that can be formed from Nb or Ta contained in the solution. After the treatment with APDC the pH of the solution is raised to 6 or above to precipitate the refined metal hydroxide.

摘要翻译： 通过将金属氢氧化物溶解在氢氟酸或草酸的水溶液中，将溶液的pH调节至1至4并加入吡咯烷二硫代氨基甲酸铵（其中， APDC），同时将溶液的温度保持在60℃以下。加入APDC使过渡金属同时作为配位化合物沉淀。 APDC的最小量为可以由溶液中含有的Nb或Ta形成的Nb 2 O 5或Ta 2 O 5的0.05重量％。 用APDC处理后，将溶液的pH升至6以上，沉淀精制金属氢氧化物。