(Session 2)Alternative methods of leaching to conventional cyanidation method in gold mining industry.

摘要

Cyanidation process, nowadays, is widely used in gold mining industry despitesome crucial disadvantages. Cyanide reagent is toxic with exposure average limit of5mg/m3. Moreover, there is a limitation of a minimum concentration of Au in ore of 0.9g/tduring the leaching process, which means that below this concentration the cyanidationmay not be feasible. From this point of view, an alternative, cheap, non-toxic and efficientmethod for leaching should be found. Ammonium thiosulfate is the cheapest and harmlessleaching reagent, compared to other alternative reagents such as, thiourea, bromide, iodineand thiocyanate.