| Abstrakt: |
Pyrite cinders enriched in iron, gold-silver, copper, and other valuable metals which have an important comprehensive recycling value. Recovering copper from pyrite cinders by sulfuric acid leaching will cause the loss of iron and increase the consumption of alkaline in subsequent cyanide process of gold and silver, leading to high production cost. In order to solve these problems, copper from pyrite cinders was recovered by ammonia leach, the effects of leaching time, slurry pH and other process parameters on copper leaching rate were studied. The results show that the effects of leaching time, slurry pH, liquid-to-solid ratio, agitation speed and leaching temperature on copper leaching were significant. Under the optimal leaching conditions of pH 10. 81, liquid-to-solid ratio 7 : 1, leaching time 1 h, agitation speed 600 r/min, temperature 20±2 °C, the extraction rate of copper was 82.66%, and the iron content in ammonia leaching residues was high, which was beneficial to pyrite cinders pellet for iron making. [ABSTRACT FROM AUTHOR] |
