论文部分内容阅读
含有过渡金属(Ⅱ)的氢氧化铌或氢氧化钽的提纯按下述步骤进行:(a)在氢氟酸或草酸溶液中溶解上述原料得到溶液(Ⅰ);(b)调整溶液(Ⅰ)至pH1～4;(c)在少骤(b)以后保持溶液(Ⅰ)的温度最低60℃(试验中为60℃,申请的专利中为最高40℃),并加入按M_2O_5重量0.05％计算的吡咯环二硫代碳酸铵(Ⅲ)到溶液中,使溶液(Ⅰ)中的金属M(M为铌或钽)能生成含过渡金属(Ⅱ)的沉淀;(d)从溶液(Ⅰ)中除去沉淀;(e)提高溶液(Ⅰ)的pH>6以得到提纯的
The purification of niobium hydroxide or tantalum hydroxide containing a transition metal (II) is carried out by: (a) dissolving the above raw materials in a hydrofluoric acid or oxalic acid solution to obtain a solution (I); (b) adjusting the solution To a pH of from 1 to 4; (c) maintaining the temperature of the solution (I) at a minimum of 60 ° C (60 ° C in the test and up to 40 ° C in the patent application) after step (b) (III) of pyrrole ring dithiocarbonate to the solution so that the metal M (M is niobium or tantalum) in the solution (I) can form a precipitate containing the transition metal (II); (d) (E) raising the pH of solution (I)> 6 to obtain a purified product