从碲渣中回收碲的工艺研究

Study on process of recovering tellurium from the tellurium slag

铅电解精炼产生的阳极泥经分银炉精炼后产出的碲渣中,碲含量较高.目前这部分碲渣作为返料返回还原炉熔炼,不仅影响金银的回收率,而且使碲无法回收.采用球磨浸出—净化—中和沉碲—煅烧—碱液浸出—电解的工艺回收碲,金属碲的回收率可达到80%,并且此流程简单,环境污染小.

The tellurium slag is produced when anode slime of the lead electrolyzed is refined in the silver-making stove. At present, this part of the tellurium slag returns back to reduction furnace for smelting again. This technique not only affected the recovery rate of gold and silver, but also made recycling tellurium difficult. Using the method of ball mill leaching, purification, and neutralization of heavy tellurium, calcination, alkali leaching, electrolytic to recover Te from the tellurium slag, the recovery rate of tellurium metal can be up to 80%. This process has the advantage of simple equipment, and the less environmental pollution.