公开(公告)号：US4673554A

公开(公告)日：1987-06-16

申请号：US808767

申请日：1985-12-13

申请人： Kenji Niwa ,  Ichiro Ichikawa

发明人： Kenji Niwa ,  Ichiro Ichikawa

IPC分类号： C01G35/00 ,  C22B3/28 ,  C22B34/24

CPC分类号： C22B34/24 ,  C01G35/003 ,  C22B3/0016 ,  Y02P10/234

摘要： A method for obtaining high-purity tantalum pentoxide is disclosed, which comprises the following steps:dissolving a crude tantalum-containing compound in an acid containing hydrofluoric acid;mixing and bringing the resulting acidic aqueous solution of the crude tantalum-containing compound into contact with an organic solution composed of a water-insoluble quaternary ammonium compound and a water-insoluble organic solvent, to extract the tantalum from said acidic aqueous solution into said organic solution;mixing said organic solution with an aqueous solution containing at least one compound selected from the group consisting of an inorganic acid and an ammonium salt, to remove any of the impurities that have partly been extracted into said organic solution together with tantalum from said organic solution;converting the tantalum in said organic solution to tantalum hydroxide by treatment with an alkali containing ammonium hydroxide; andprecipitating said tantalum hydroxide and separating it, followed by calcining it to obtain high-purity tantalum pentoxide. The tantalum pentoxide has an extremely high purity as five to six nines (99.999% to 99.9999%).

摘要翻译： 公开了一种获得高纯度五氧化二钽的方法，其包括以下步骤：将含粗钽的化合物溶解在含有氢氟酸的酸中; 将得到的含粗钽化合物的酸性水溶液混合并与由水不溶性季铵化合物和水不溶性有机溶剂组成的有机溶液接触，将钽从所述酸性水溶液中提取到所述有机溶剂中 解; 将所述有机溶液与含有至少一种选自无机酸和铵盐的化合物的水溶液混合，以除去部分从所述有机溶液中与钽一起萃取到所述有机溶液中的杂质; 通过用含氢氧化铵处理将所述有机溶液中的钽转化为氢氧化钽; 并沉淀所述氢氧化钽并分离，然后煅烧，得到高纯度的五氧化二钽。 五氧化二钽具有非常高的纯度，为五至六（99.999％至99.9999％）。