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铟电解液的纯度是铟电解提纯效果的主要影响因素之一。为了有效提高铟电解精炼的纯度,对铟电解液的净化方法进行研究,提出静态净化与动态净化的概念,并将静态净化和动态净化相联合对铟电解液进行净化处理。静态净化采用硫酸钡共沉淀方法,动态净化采用海绵铟柱置换方法。研究表明:静态净化的条件为:在搅拌状态下,以BaCl2为沉淀剂,逐滴滴入经硫酸酸化过的铟电解液中。BaCl2用量控制在每升硫酸铟溶液中加入15～30 g氯化钡,反应温度控制在30～50℃之间。动态净化中所用的海绵铟纯度需高于配制电解液所用铟的纯度1～2个数量级,每升电解液需用20～200 g海绵铟。该方法突破单纯静态净化的思路,将电解液的净化过程由电解前延伸至电解过程中,不仅保证了最初配制电解液的纯度,也可以使铟电解液在电解过程中随时得到净化。静态与动态联合的净化方法,同时保证了电解前及电解过程中的电解液纯度,一次电解完毕后可直接重复利用该电解液,不用再进行其他净化,可以大大减少铟电解工艺的工作量。
The purity of indium electrolyte is one of the main factors affecting the purification effect of indium electrolysis. In order to effectively improve the purity of indium electrolytic refining, indium electrolyte purification methods were studied, the concept of static purification and dynamic purification was proposed, and static purification and dynamic purification combined indium electrolyte purification. Static purification using barium sulfate coprecipitation method, the dynamic purification of sponge indium column replacement method. The results show that the conditions of static purification are as follows: BaCl2 is added as a precipitating agent to the sulfuric acid acidified indium electrolyte dropwisely while stirring. BaCl2 dosage control Add 15 ~ 30g barium chloride per liter of indium sulfate solution, the reaction temperature is controlled at 30 ~ 50 ℃. The purity of sponge indium used in dynamic purification should be higher than the purity of indium used in the preparation of electrolytes by 1 to 2 orders of magnitude and 20 to 200 g of sponge indium per liter of electrolyte. The method breaks through the idea of simple static purification and extends the purification process of the electrolyte from the electrolysis to the electrolysis before not only ensuring the purity of the electrolyte initially formulated but also purifying the indium electrolyte at any time during electrolysis. Static and dynamic combination of purification methods, while ensuring the purity of the electrolyte before and during the electrolysis process, once the electrolysis can be directly repeated use of the electrolyte, without further purification, can greatly reduce the workload of the indium electrolysis process.