氯铂酸铵酸洗除杂精炼铂

提出通过酸洗氯铂酸铵除杂精炼铂的方法。研究了酸种类、酸浓度、固液比、温度对酸洗除杂效率的影响，优选条件下90%以上的Na、Al、Fe、Si被去除，铂溶解率低于0.3%,酸洗氯铂酸铵制备的海绵铂除Sn外其余杂质含量达到SM-Pt 99.95标准。对酸洗过程Sn的行为研究结果表明，酸洗或煅烧氯铂酸铵都可以去除以(NH₄)₂SnCl₆形式存在的Sn,实现相同的除Sn效果，但不能去除以SnO₂形式存在的Sn。

Platinum Refining by Acid Pickling Ammonium Chloroplatinate

The method of refining platinum by acid pickling ammonium chloroplatinate to remove impurities was proposed for the first time. The effects of acid pickling reagents, acid concentration, solid-liquid ratio of system, and temperature on impurities removal efficiency by acid pickling were studied. More than 90% of Na, Al, Fe, and Si are removed under the optimum conditions, while the loss rate of Pt is less than 0.3%. The content of impurities except Sn in the sponge platinum prepared by pickling ammonium chloroplatinate reaches the SM-Pt 99.95 standard. The behavior of Sn in the acid pickling process was studied. The results show that either acid pickling or calcination of ammonium chloroplatinate could remove Sn in the form of (NH4)2SnCl6 to achieve the same effect of Sn removal, but could not remove Sn in the form of SnO2.