Effect of roasting and injection of H2O2 on recovery of gold cyanidation.

Gold ores in Tasikmalaya region, West Java, are commonly found in the form of sulfide ores. Sulfide minerals generally include chalcopyrite, pyrite, galena, sphalerite, and chalcocite. These sulfide minerals would obstruct the extraction of gold through cyanidation process. According to XRF test, it is obtained that Tasikmalaya ores contain 83.68% of silica. Cyanidation of gold was carried out in three conditions. The first condition was done by roasting the gold ores before cyanidation. The second one was conducted by adding H2O2 and the last one by doing cyanidation process without roasting and H2O2 addition. The cyanidation process was carried out along 48 hours with cyanide concentrations varied of 300, 500, and 700 ppm. The highest gold recovery of 95.86% was achieved through H2O2 addition with 700 ppm of cyanide concentration. [ABSTRACT FROM AUTHOR]