Since the sulfide minerals are to some extent soluble in cyanide solutions, there will always be some sulfur species present in the leach solution. It has been shown that soluble sulfide hinders the rate of gold leaching, forming a protective layer of the type Au/S x.
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1-9-2000· Such a finding suggests that in this instance lead hinders the Cyanide leaching of gold in solutions containing sulfide 1105 leaching reaction. It is believed that in the presence of hydrosulfide ions, the lead present on the gold surface is oxidised to form PbS (Eof this reaction is …
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Request PDF | Cyanide leaching of gold in solutions containing sulfide | A large proportion of the gold processed in the 21st century will be recovered from sulfide ores. Since the sulfide ...
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The cyanide leaching of gold in solutions containing sulfide. / Jeffrey, Matthew I; Breuer, Paul L. In: Minerals Engineering, 2000, p. 1097 - 1106. Research output: …
Get PriceThe cyanide leaching of gold in solutions containing sulfide by M.I. JEFFREY and P.L. BREUER.pdf
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1-8-2006· The oxidation of gold and some sulfide minerals in solutions containing 5 mmol L − 1 cyanide and 50 mmol L − 1 sodium perchlorate as background electrolyte was studied using linear sweep voltammetry, and the polarization curves are shown in Fig. 1.It can be seen that gold oxidation commences at − 620 mV and approaches a diffusion limited current of 15 A m − 2 at 0 mV.
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Sulfide sulfur solution 2M sulfur + 2M sodium sulfide Bisulfide sulfur solution 2M sulfur + 2M sodium bisulfide Prior to each experiment, gold was electroplated onto the platinum coated quartz electrode at 25A/m2 from a solution containing 0.02M potassium dicyanoaurate, 0.23M potassium cyanide, 0.086M potassium carbonate.
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The effect of galvanic interactions and sulfide mineral dissolution on the gold leaching kinetics in aerated cyanide solutions is investigated. Gold leaching kinetics were measured using a ...
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Gold cyanidation (also known as the cyanide process or the MacArthur-Forrest process) is a hydrometallurgical technique for extracting gold from low-grade ore by converting the gold to a water-soluble coordination complex. It is the most commonly used leaching process for gold extraction. Production of reagentsfor mineral processing to recover gold, copper, zinc and silver represents approximately 13% of cyanide consumption globally, with the remaining 87% of cyanide used in other i…
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1-3-2019· 1. Introduction. Gold cyanidation is a well-known gold leaching process in the gold mining industry. Based on the Elsner's equation (Elsner, 1846), gold is leached in a cyanide solution by the formation of cyanide complex [Au(CN) 2 −] under an oxidizing condition (Eq.). (1) 4 Au + 8 C N − + O 2 aq + 2 H 2 O = 4 Au CN 2 − + 4 O H − Gold cyanidation is an electrochemical reaction, in ...
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Cyanidation of gold ores containing copper, silver, 1. Introduction 1.1. General. Early studies on the dissolution of gold in cyanide solution in the presence of sulfide minerals have shown that heavy metal components, such as Cu, Fe and Zn, significantly increase the consumption of both cyanide and oxygen (Habashi, 1967, Dai and Jeffrey, 2006).In addition, the sulfide component has been shown ...
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The effect of sulfur addition to a solution containing 2M sulfide on the leach rate and mixed ... cyanide-assisted gold leaching has been considered to be the predominant method for gold ...
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A large proportion of the gold processed in the 21"' century will be recovered from sulfide ores. Since the sulfide minerals are to some extent soluble in cyanide solutions, there will always be some sulfur species present in the leach solution. It has been shown that soluble sulfide hinders the rate of gold leaching, forming a protective layer of the type AulSx. Electrochemical studies of the ...
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The gold dissolution in anoxic cyanide solution in the presence of chalcopyrite was studied with a rotating disc electrode. It was found that the presence of chalcopyrite reduced and enhanced the dissolution activity of pure gold in the low and high potential regions, respectively. The dissolution of gold was diffusion-controlled at low potentials (≤177 mV) and low cyanide concentrations ...
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Cyanide Leaching Chemistry & Gold Cyanidation. When sulphide minerals such as covellite, pyrrhotite, sphalerite, etc. are decomposed by, or dissolved in cyanide solutions, some of the products of the reactions, in addition to cyanide complexes, are alkaline sulphides, thiosulphates, thiocyanates.Some of these affect adversely’ the dissolution and precipitation of gold.
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dissociates at low cyanide concentrations for use in gold leaching. The extent of preg-robbing onto mineral surfaces was also shown to be related to the metal-cyanide complexes in solution, with these complexes serving to inhibit preg robbing. However, free cyanide was found to be much more important in preventing preg-robbing.
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conditions of gold leaching by means of thiourea method from the above-mentioned ores and concentrates with 85-90% gold extraction were established. Investigations were carried out on electrochemical leaching of refractory gold-containing sulfide ores and concentrates. We used the acid chloride electrolyte, which
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solution containing 0.34 1b NaCN per ton of solution and 2.S lb lime per ton of ore. The slurry was rolled in a plastic bottle for 24 h at 200 to 2So C. Follow ing cyanide leaching, varying amounts of sulfide were added to the slurry and mixed by rolling for 1 h. The slurry was
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The agitation leaching method is to concentrate the slurry, obtained after grinding and classifying of the gold-containing ore, to a suitable concentration, place it in a leaching tank, add a cyanide solution, and aerate to carry out leaching.
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Standard bottle tests were run to determine Au and Hg extraction with increasing cyanide concentration in the leach solution. One-hundred grams of test ore were leached in 150 ml of solution containing from 0.042 g NaCN/L (0.084 lb/ton) to 0.5 g NaCN/L (1.0 lb/ton) and 0.06 g CaO (1.2 lb/ton).
Get PriceCyanidation of gold ores containing copper, silver, 1. Introduction 1.1. General. Early studies on the dissolution of gold in cyanide solution in the presence of sulfide minerals have shown that heavy metal components, such as Cu, Fe and Zn, significantly increase the consumption of both cyanide and oxygen (Habashi, 1967, Dai and Jeffrey, 2006).In addition, the sulfide component has been shown ...
Get PriceA large proportion of the gold processed in the 21"' century will be recovered from sulfide ores. Since the sulfide minerals are to some extent soluble in cyanide solutions, there will always be some sulfur species present in the leach solution. It has been shown that soluble sulfide hinders the rate of gold leaching, forming a protective layer of the type AulSx. Electrochemical studies of the ...
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Using cyanide to recover gold from sulfide ores generally results in 30 to 35% recovery, and the best I have heard of is around 50% recovery. The fine coating of a iron compound definitely appears to be a key component of the inability of cyanide to efficiently leach low grade pyritic ores.
Get PriceCyanide Leaching Chemistry & Gold Cyanidation. When sulphide minerals such as covellite, pyrrhotite, sphalerite, etc. are decomposed by, or dissolved in cyanide solutions, some of the products of the reactions, in addition to cyanide complexes, are alkaline sulphides, thiosulphates, thiocyanates.Some of these affect adversely’ the dissolution and precipitation of gold.
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The Effect of Sulfide Minerals on the Leaching of Gold in Aerated Cyanide Solutions - Free download as PDF File (.pdf), Text File (.txt) or read online for free.
Get Pricesolution containing 0.34 1b NaCN per ton of solution and 2.S lb lime per ton of ore. The slurry was rolled in a plastic bottle for 24 h at 200 to 2So C. Follow ing cyanide leaching, varying amounts of sulfide were added to the slurry and mixed by rolling for 1 h. The slurry was
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Leaching gold with a cyanide solution remains the most widely used hydrometallurgical process for the extraction of gold from ores and concentrates. Despite the difficulties and hazards of working with cyanide, no other process has yet been proven to be an economic viable alternative.
Get PriceThe agitation leaching method is to concentrate the slurry, obtained after grinding and classifying of the gold-containing ore, to a suitable concentration, place it in a leaching tank, add a cyanide solution, and aerate to carry out leaching.
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Gold dissolution versus leaching time in solutions containing: (a) 11 mM free cyanide and (b) 5.5 mM Cu, 11 mM CN-, 1 g/L (13.3 mM) glycine at pH 11. 5 Effect of pH on gold leaching with cyanide in the
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The gold is mixed with the sodium cyanide which leads to the following Elsener’s equation and reaction. This is done to make soluble gold; Now the gold is soluble. This method of making soluble gold is known as leaching. In the process of leaching, a dilute form of sodium cyanide is added into the ore containing the gold.
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