铟电解液净化方法研究

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。

Purifying Process of Indium Electrolyte

The purity of indium electrolyte was one of the main influence factors in indium electrolytic refining.In order to improve the purity of indium electrolytic refining,the purifying process of indium electrolyte was focused.Static purifying process and dynamic purifying process were brought forward.It was suggested to use static purifying process and dynamic purifying process simultaneously to purify indium electrolyte.Barium sulfate coprecipitation was used in static purifying process and sponge indium replacement was used in dynamic purifying process.During static purifying process,the precipitator was BaCl2.The results showed that the best experimental condition of static purifying process was under the mezzo whipping state,the dosage of BaCl2 should be controlled to 15~30 g per litre indium electrolyte and the reaction temperature should be controlled within 30~50 ℃.During dynamic purifying process,the purity of sponge indium must be higher than the one of indium used to confect electrolyte and the mass fraction of sponge indium was between 20 and 200 g per litre In2(SO4)3 solution.This purifying process of indium electrolyte breached the blinkered static purifying process and could be extended to the course of electrolysis.Not only the initial electrolyte purity could be ensured,but also the electrolyte purity could be purified during the whole electrolysis process.Using static and dynamic purifying process simultaneously to purify indium electrolyte could ensure the purity of indium electrolyte not only before but also during electrolysis.And the indium electrolyte after electrolysis could be used once again without any else purifying process.Then the workload of indium electrolysis could be lessened greatly.