难溶铑物料高温高压快速溶解技术研究

摘要

铑粉的溶解是铑精炼提纯中的重要环节.传统方法溶解周期长,转化率低,易引入污染,使用高压釜在高温高压下溶解铑粉具有较强的应用前景.研究了液固比、盐酸浓度、温度等因素对铑粉浸出的影响.得到的最佳浸出工艺条件为:液固比10∶1,盐酸浓度5 mol/L,反应温度200℃,氧气分压0.5 MPa,氯酸钠氧化剂用量为铑粉量的4倍.在400 r/min搅拌转速下反应,经3h铑粉的一次浸出率达到99％以上.%Dissolution of rhodium powders is a very important link in refining and purification of rhodium. The traditional methods have shortages of long dissolution period, low transformation efficiency and easy to introduce pollution, so the technology of fast dissolving rhodium powders in autoclave with high temperature and pressure has a good application prospect. Effects of factors, such as the liquid-solid ratio, HCl concentration, and reaction temperature, on the leaching rate of rhodium were studied, and the optimum process conditions are given as follows: liquid-solid ratio 10:1; HCl concentration 5 mol/L; reaction temperature 200 ℃; oxygen partial pressure 0.5 Mpa; dosage of NaClO3 oxidant weights 4 times of rhodium powder. With the stirring rate of 400 r/min, more than 99% rhodium powders were dissolved in 3 hours.