Study of the Effect of Dissolved Oxygen Concentration on Gold Recovery Leaching at PT Indo Muro Kencana

Abstract

Gold is a very important metal in human life. Most gold is processed using the cyanidation method. The most commonly used cyanidation method is the agitation leaching method. The cyanidation method will produce aurocyanide complexes that will be further processed, with activated carbon adsorption stages using the carbon in leach method to increase gold recovery. To maximize leach recovery, optimization of leaching and carbon adsorption process parameters is carried out, one of which is dissolved oxygen (DO) levels. Oxygen is added to oxidize gold atoms (Au) into cations (Au+) which will then react with cyanide ions (CN-) to form the aurocyanide complex anion Au(CN)2- dissolved in cyanide solution. To optimize leaching, various testworks were carried out by varying the operating parameters in the leaching process. This study used dissolved oxygen variations derived from oxygen injection with a recovery of 92.5% Au and 80.5% Ag, hydrogen peroxide achieved a recovery of 92.5% Au and 79.9% Ag, and Aachen sheared with a recovery of 95% Au and 81.9% Ag.keyword: Gold, Cyanidation, Dissolved Oxygen, Percent Recovery