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

Abstract

<p><span><strong>Abstract</strong>. <span>Gold is a very important metal in human life. Most gold is processed using</span><br /><span>the sodium cyanide (NaCN) leaching method. Maximizing the leaching recovery </span><span>can be done by optimizing the leaching process parameters, one of which </span><span>varies the concentration of dissolved oxygen (DO). Oxygen is added to </span><span>oxidize gold atoms (Au) into cations (Au+) which will then react with </span><span>cyanide ions (CN-) to form the aurocyanid complex anion Au(CN)2- dissolved </span><span>in cyanide solution. This study aims to investigate the best method between </span><span>the use of O2 , H2O2, and Aachen reactor in generating dissolved oxygen </span><span>concentration to oxidize valuable metals. From the experimental results, </span><span>which method can produce higher leaching recovery will be seen. Based on </span><span>this study, the dissolved oxygen variation derived from oxygen injection </span><span>(O2) obtained a percent recovery of 92.5% Au and 80.5% Ag, hydrogen peroxide </span><span>(H2O2) achieved a percent recovery of 92.5% Au and 79.9% Ag, and Aachen </span><span>sheared (Aachen reactor) with a percent recovery of 95% Au and 81.9% Ag.</span></span><br /><br /><span><strong>Keywords</strong>:</span></p><p>Gold, Leaching, Dissolved Oxygen, Percent Recovery, Aachen Reactor</p>