Publication: Ammoniacal cyanide leaching of complex gold ore
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Date
2022-08-17
Authors
Merdan, Fathin Atiqa
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Abstract
The gold ore samples obtained in this study were exposed to ammonia cyanidation leaching at different levels of ammonia (NH3) and sodium cyanide (NaCN) reagents in gold
and copper extractors. Mineral characterization of gold ore samples was carried out to identify mineral correlation, mineral composition, and mineral phase through XRD and XRF
analysis. The 'bottle roll' test method is used to obtain basic information about the solubility of certain Au-bearing ores. The primary effects and interactions of NH3 and NaCN are shown in the ammonia cyanide system using a 'Full Factorial' experimental design. NH3 and NaCN concentrations have been statistically proven to be the main determinants affecting goldextractability. The amount of gold obtained from the fire test technique is 2.762 mg/L. The largest yield using the ammonia leaching technique to determine free gold in gold ore
samples was 2.625 mg/L using 3000 ppm cyanide, and 1000 ppm ammonia. Therefore, it can be concluded that ammonia leaching solvent can increase the release of high gold particles with high consumption of cyanide and ammonia.