Cyanidation of gold ores containing copper, silver, lead, arsenic and .
The second sample had a low gold content (2.5 ppm) but a high silver content . Acid pretreatment reduced cyanide consumption by 340 and 210 mg/L .. to the processing plant were the decant water (55.10%) and thickener overflow (34.55%). . efficient for leaching coinage metals from ores and mineral concentrates.
electrowinning cell efficiency, and gold losses by cementation onto copper minerals. . cyanides) discharged to the TSF is limited to 50 mg / L or lower. .. The high consumption of cyanide during the cyanidation of copper gold ores is due to one or more . thickeners and counter current decantation (CCD). .. redox couple.
The leaching and adsorption behaviour of gold ores Minerva Access
Cyanide consumption and gold leaching of the copper concentrate .. The adsorption reaction is favoured by low pH, low cyanide concentrations and low .. despite these difficulties, a number of effective CIP/CIL models have been .. thickeners, three air agitated pre leach tanks and seven carbon in leach tanks.
Figure 10 Effect of pH on cyanide consumption (Ling et al., 1996). and consequently reduce the efficiency of gold leaching. . common copper minerals showing low solubility in cyanide solution. . solution (Au(CN)2Ø ) was found to occur at the redox potential range of 0.4 and .. added after thickening (Stange, 1999).
Use in Mining . International Cyanide Management Code (ICMI) For .
Gold and silver typically occur at very low concentrations in ores less than 10 g/t or . than the metals, and cyanide is consumed by the formation of thiocyanate. . but is a slow process and the extraction efficiency is a relatively low 50 75%. . be separated from the solids components utilizing filtration or thickening units.
Gold cyanidation is a hydrometallurgical technique for extracting gold from low grade ore by . In this redox process, oxygen removes, via a two step reaction, one electron from . Oxygen is one of the reagents consumed during cyanidation, and a . to cyanide, therefore making the gold cyanidation process more efficient.
Gold Precious Metals Conference ALTA Metallurgical Services
CRITICAL ISSUES THICKENING & FILTERING OF DIFFICULT GOLD ORES. 116 .. from an economic standpoint and that the over all efficiency is low when .. kinetics for all leachable gold, high silver extraction and high redox in the . The historical usage of lead containing compounds used as gold leaching enhancers is.