The Effect of Increasing Capacity on Gold （增加容量对黄金的影响）.pdf

Australian Journal of Basic and Applied Sciences, 7(2): 702-708, 2013 ISSN 1991-8178 The Effect of Increasing Capacity on Gold Recovery and Optimization of Cyanidation Parameters in Aghdarreh Gold Ore Plant Rahim Esmkhani, Bahman Ghobadi, Akbar Amirkhani and Sepide Rezadust Department of chemistry, Islamic Azad University, Khoy Branch , Khoy, Iran Abstract: Background: Cyanidation process is used for gold recovery in Aghdarreh gold plant. Some of the most effective parameters on cyanidation process are concentration of cyanide, solid weight percent, pH, particle size, dissolved oxygen, retention time and agitation speed. The present research work is based on finding the suboptimum conditions for the effect of these parameters on gold recovery in Aghdarreh ore is investigated using the Tagouchi method. The Taguchi method was used to design and minimize of experiments. Results: According to these results, reduction of retention time from 25 to 15 hours does not have any effect on gold recovery so increasing of Aghdarreh gold plant capacity to 160 t/h doesnt change the gold recovery. By using Taguchi orthogonal (L18) array, five parameters (cyanide concentration, solid weight percent, pH , particle size, retention time) five parameters were selected for experiments. Thereupon The suboptimal condition for gold recovery equal to 700g/t sodium cyanide concentration, pH = 10, solid percent in pulp = 46 and particle size = 45 micron. At this condition, gold recovery was 90.71±1.12 %. Conclusions: The suboptimal of cyanidation process indicated that concentration of cyanide, solid weight percent, particle size, retention time are the effective parameters an