(PDF) Treatment of a CopperRich Gold Ore by Ammonia
Copperbearing gold ores prove difficult to treat due to the adverse effect of copper on cyanide leaching of gold. This study has shown ammonia pretreatment and ammonia assisted cyanide leaching
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Copperbearing gold ores prove difficult to treat due to the adverse effect of copper on cyanide leaching of gold. This study has shown ammonia pretreatment and ammonia assisted cyanide leaching
15/8/2020#0183;#32;Fig. 12 illustrates the effects of thiosulfate concentration on the gold extraction, cupriccitrate complex concentration and thiosulfate consumption during leaching process of gold ore in coppercitratethiosulfate solutions. It is observed that the leaching rate of gold increases with an increase of thiosulfate concentration in the range of mol/L.
1/8/2005#0183;#32;Fundamental studies recently published have shown that the addition of ammonia decreased the gold leach rate in the absence of copper, had little effect on the leaching of gold by Cu(CN) 3 2, but does increase the leaching kinetics when the major cyanide species present is Cu(CN) 2 (Jeffrey et al., 2002). The presence of copper(II) was also shown to increase the gold leach rate
The selective leaching of copper from a goldcopper concentrate in copper in high percentages in a gold ore has negative effects on the efciencyand economic viability of any goldprojectdueto (1)highcyanide consumption in which copper will consume at least kg of so
Metallurgical ContentRecovering Gold from Iron SulphidesHow Thiocyanate Affect Gold LeachingUsing Lead Salts in Gold LeachingHow Ferrocyanides influences Gold LeachingEffect of preaeration on gold leach recoveryHow the method of prelime treatment affects gold leachingDirect Leaching in Grinding CircuitA trick to reduce cyanide consumptionGold Leaching with Copper Minerals presentLeaching
Bas et al. [19] investigated the effect of an ammonia pretreatment before leaching copper suldebearing gold ore to increase gold extraction at low cyanide concentrations. Gold extraction increased from % (leaching without pretreatment) to % with pretreatment.
from the dissociation of the complex is used to leach gold from the ore. The stepwise dissociation of cyanide from coppercyanide complexes can also be used to leach gold from a variety of oxide and sulphide ores. The copper cyanide''s fourth ligand readily dissociates at low cyanide concentrations for use in gold leaching.
Copper minerals present difficulties during the cyanide leaching of gold ores leading to excessively. high consumption of cyanide (and oxygen) coupled with low extraction of gold. Copper cyanide
The hydrometallurgical leaching of native gold from goldbearing ores or the dissolution of gold metal during the recycling of electronic and precious metal scrap is performed every day using hazardous chemicals such as sodium cyanide or aqua regia. These chemicals represent health and safety risks for workers and a serious threat for the
When reviewing Methods of Eliminating Copper from Gold Ores we see that several methods have been suggested to eliminate copper from ores prior to cyanidation. Preliminary extraction of the copper with sulphuric or sulphurous acids may be applicable to ores containing oxidized copper minerals such as malachite, azurite and chrysocolla but these acids have but little effect on sulphide copper
1/8/2005#0183;#32;Gold leaching occurs in air saturated Cu(CN)32solutions at a much slower rate than in free cyanide solutions. A similar gold leach rate is observed when copper is alloyed with the gold. The dissolution of several common copper minerals in Cu(CN)32also occurs at significantly slower rates, and in some cases not at all.
(2017) for consideration of treatment of coppergold ores. The results showed that the addition of glycine improved gold dissolution rate in copper (I)cyanide solutions, which contain almost no free cyanide in the solution. Eksteen et al. (2017) stated that glycine leaching of gold in
1/10/2000#0183;#32;Between 7075% of the cyanide consumed is related to complexation with copper. Gold ore #2 is second for cyanide consumption with kg/t. The second gold ore generated higher cyanide consumption than the first gold ore that has % pyrrhotite, % pyrite and a
Lead Nitrate addition in CIL operations and how the dosage of Pb Lead nitrate affects gold leaching kinetic rates. The main aim for adding lead nitrate is to help in Gold dissolution in CIL plants. Should the gold solid tails be the main aim for dosing lead nitrate in the treatment of slightly compl
existence of insoluble gold compounds . In some ores, gold exists in the form of tellurides (such as tellurium gold ore, tellurium silver gold ore, tellurium antimony gold ore, tellurium copper gold ore), solid solution silver gold ore and other alloys. They play a very important role in cyanide solution. slow.
Arsenic sulfides such as arsenopyrite have a negative effect in gold leaching. 5. Copper sulfides: ores that contain gold associated with copper sulfide minerals belong to this class. Chalcopyrite and chalcosite are the main copper minerals and they have a detrimental effect in gold leaching. 6.
In this work, the feasibility of using alkaline cyanide solutions for leaching copper, gold, and silver from Cu/Au/Ag ores is analysed and compared with acid leaching.
1/5/2017#0183;#32;The effect of glycine/copper and cyanide/copper molar ratios on gold and copper leaching kinetics in synergistic leach process has also been studied. The synergistic leach process treats goldcopper deposits by breaking down the coppercyanide complexes to give a zero, or a very low free cyanide concentration in the presence of glycine.
When the content of soluble copper and zinc in a gold mine is relatively low, increasing the oxide can improve the rate of gold cyanide leaching if the increase of cyanide does not cause economic loss.
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