粗金粉中金的氯浸-控制电位还原精炼

某冶炼厂氰化金泥还原得到的粗金产品纯度较低，采用氯浸-还原工艺对粗金进行了精炼提纯。在生产工艺中采用盐酸+氯酸钠对粗金进行氯浸溶解，用焦亚硫酸钠控制电位选择性还原浸出液中的金。采用补水-冷却使银和铅从氯浸液充分沉淀析出，通过调整pH值、改变焦亚硫酸钠添加方式、精确控制还原电位等方法，产品金锭达到IC-Au99.99标准。两年的生产实践创造了明显的经济效益。

Chlorination leaching - controlled potential reduction refining of gold in crude gold powder

The purity of the crude gold powder obtained by reducing cyanide gold slime in a domestic smelter is low, so the crude gold is further refined and purified by the chlorine leaching-reduction process. In the production process, the crude gold is first dissolved by clorination leaching with hydrochloric acid + sodium chlorate, and the gold in the leaching solution is selectively reduced by controlling the potential with sodium metabisulfite. The silver and lead are fully precipitated from the chlorine leaching solution by replenishing water and cooling. By adjusting the pH value, changing the sodium metabisulfite addition method, and accurately controlling the reduction potential, the product gold ingot reaches the IC-Au99.99% standard. Two years of production practice have created obvious economic benefits.