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以ITO(Indium Tin Oxide)废靶材为原料进行盐酸溶解、铝置换和电解 ,以回收金属铟。讨论了酸溶解、铟锡分离和电解的影响因素。得出用盐酸溶解 ,用量为理论用量的 1.5～ 3倍 ,溶解温度在 85℃时 ,靶材溶解迅速彻底。溶液温度为 5 0℃时 ,用金属铟置换溶液中锡离子 ,再用薄铝片将铟离子置换出来 ,粗铟的回收率可达到 97%。粗铟电解的最佳条件是 [In] =5 0～ 10 0 g·L- 1 ,温度 2 5℃ ,pH值 2 .5 ,电流密度 60～ 80A·m- 2 ,槽电压 3 3 0～ 3 5 0mV ,电解得到纯度 99.995 %的金属铟 ,金属铟总的回收率大于 93 %。
The ITO (Indium Tin Oxide) waste target material was used for hydrochloric acid dissolution, aluminum substitution and electrolysis to recover metal indium. The influencing factors of acid dissolution, indium tin separation and electrolysis are discussed. Obtained with hydrochloric acid dissolved in an amount of 1.5 to 3 times the theoretical amount, the dissolution temperature at 85 ℃, the target dissolved quickly and thoroughly. When the temperature of the solution is 50 ° C, the metal ions are used to replace the tin ions in the solution, and then the indium ions are replaced by thin aluminum sheets to obtain a crude indium recovery rate of 97%. The optimum conditions of crude indium electrolysis are: [In] = 50 ~ 100 g · L -1, temperature 25 ℃, pH value 2.5, current density 60 ~ 80A · m -2, cell voltage 330 ~ 350mV, electrolysis to obtain a purity of 99.995% metal indium, metal indium total recovery greater than 93%.