The Cyanide Leaching Of Gold In Solutions Containing Sulfide-GOLD MINING

MINING

The cyanide leaching of gold in solutions containing sulfide .

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 0.93 V Antelman and Harris, 1992 .

The cyanide leaching of gold in solutions containing sulfide .

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. Electrochemical studies of the constituent half reactions: gold oxidation .

Cyanide leaching of gold in solutions containing sulfide .

The leach rate of gold in cyanide solutions containing sulfide ions has been studied previously Jeffrey and Breuer, 2000 . This work showed that gold dissolution is very slow in the presence of .

The effect of sulfide minerals on the leaching of gold in .

The gold leaching rate in solutions containing chalcocite can be improved by the addition of 20 mg/L lead during the cyanide process. The role of lead is to promote the precipitation of PbS and enhance the anodic oxidation of gold via a goldlead alloy film. The addition of galena to the cyanide solution containing chalcocite was shown to .

The effect of sulfide minerals on the leaching of gold in .

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 rotating electrochemical quartz crystal microbalance REQCM , which measures the leaching rates insitu. When the mineral is electrically in contact with gold, the gold dissolution rate increases as a result .

Remediation of reduced sulfur species effects on gold and .

The results showed that it is possible to increase available cyanide levels in leach solutions, and gold and silver recoveries by sulfite addition during leaching of sulfide containing ores after controlling the tetrathionate levels in slurries.

Simultaneous sulfide oxidation and gold dissolution by .

The chloride chloridebromide solution presents an alternative cyanidefree media, which is able not only to leach goldbearing sulfide minerals, but also gold, in a single unit process. Therefore, the current study presents an investigation of simultaneous sulfide oxidation and gold leaching from refractory sulfidic and double refractory .

A fundamental study of the alkaline sulfide leaching of gold

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.

Remediation of reduced sulfur species effects on gold and .

The results showed that it is possible to increase available cyanide levels in leach solutions, and gold and silver recoveries by sulfite addition during leaching of sulfide containing ores after controlling the tetrathionate levels in slurries.

A review of gold extraction using noncyanide lixiviants .

Alkaline sulfurcontaining lixiviants, including thiosulfate, polysulfides, and alkaline sulfide solutions, stand out as a promising class of alternatives to cyanide because of their low toxicity, high efficiency, and strong adaptability. In this paper, we summarized the research progress and remaining challenges in gold extraction using these noncyanide reagents. After a brief introduction to .

Dissolution of gold in chalcopyritecontaining cyanide .

The effect of sulfide and cyanide concentrations on the leaching reaction were investigated, and it was shown that the sulfur formed is chemically attacked by cyanide, resulting in higher leach .

Dissolution of gold in chalcopyritecontaining cyanide solutions

JEFFREY M I, BREUER P L. The cyanide leaching of gold in solutions containing sulfide J . Minerals Engineering, 2000, 13 10 : 10971106. Doi: 10.1016/S08926875 00 000935. Article Google Scholar 21 LORENZEN L, DEVENTER J S J V. Electrochemical interactions between gold and its associated minerals during cyanidation J .

Calcium Sulfide Precipitation of Mercury During Cyanide .

ground ore was leached with 870 mL leach 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.

Precipitation of Mercury in Cyanide Gold Leaching

Five hundred grams of dryground ore was leached with 870 mL leach solution containing 0.34 lb NaCN per ton of solution and 2.5 lb lime per ton of ore. The slurry was rolled in a plastic bottle for 24 h at 20 to 25 C. Following cyanide leaching, varying amounts of sulfide were added to the slurry and mixed by rolling for 1 h.

Technical Report: Treatment of Cyanide Heap Leaches and .

2. CYANIDE LEACHING Cyanidation uses solutions of sodium or potassium cyanide as lixiviants leaching agents to extract precious metals from ore. Cyanidation techniques used in the gold industry today include heap or valley fill leaching, agitation leaching followed by carboninpulp CIP , and agitated carboninleach CIL . Cyanidation is best

Gold Cyanidation Heap Leaching cnlitereagent.com

5. The ore doesnt contain carbonaceous material capable of adsorbing gold cyanide complex 6. Does not contain a large number of compounds that can react with cyanide solution, such as partially oxidized antimony sulfide, zinc sulfide, iron sulfide, copper sulfide and arseniccontaining minerals. Features of Heap Leaching

10.1016/S08926875 00 000935 DeepDyve

A large proportion of the gold processed in the 21quot 39 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 .

A review of gold extraction using noncyanide lixiviants .

Alkaline sulfurcontaining lixiviants, including thiosulfate, polysulfides, and alkaline sulfide solutions, stand out as a promising class of alternatives to cyanide because of their low toxicity, high efficiency, and strong adaptability. In this paper, we summarized the research progress and remaining challenges in gold extraction using these noncyanide reagents. After a brief introduction to .

Dissolution of gold in chalcopyritecontaining cyanide .

The effect of sulfide and cyanide concentrations on the leaching reaction were investigated, and it was shown that the sulfur formed is chemically attacked by cyanide, resulting in higher leach .

Cyanide Leaching Of Gold Mine Engineer.Com

Carbonaceous gold ores can have the carbon adsorb the gold onto its surface, and as a result will not be recovered from the pregnant solution. Leaching gold from sulfide ores is difficult, at best. Generally, the recovery for cyanide leaching of sulfide or refractory ores is no better than 30, which is not a worthwhile venture.

Recovery of Silver, Gold, and Lead From a Complex Sulfide Ore .

caustic cyanide, gold and silver extrac tion is usually low with complex sulfide goldsilver ores. A procedure to extract silver from sulfide ores with FeC13 was patented by Hey in 1922 6 . Considera ble work was completed byWong 7 to re cover lead from a galena concentrate with a combined FeC13NaCl leach solution.

A Comparative Study of Sodium Cyanide and Jinchan TM Gold .

Cyanide leaching of gold in solutions containing sulfide. . shown that soluble sulfide hinders the rate of gold leaching, forming a protective layer of the type Au/Sx. . a detailed kinetic .

Predicting Cyanide Consumption in Gold Leaching: A Kinetic .

Anderson, C.G. Alkaline sulfide gold leaching kinetics. Miner. Eng. 2016, 92, 248256. Google Scholar Muir, D. A review of the selective leaching of gold from oxidised copperold ores with ammoniacyanide and new insights for plant control and operation. Miner. Eng. 2011, 24, 576582. Google Scholar

Gold Cyanidation Heap Leaching cnlitereagent.com

5. The ore doesnt contain carbonaceous material capable of adsorbing gold cyanide complex 6. Does not contain a large number of compounds that can react with cyanide solution, such as partially oxidized antimony sulfide, zinc sulfide, iron sulfide, copper sulfide and arseniccontaining minerals. Features of Heap Leaching

10.1016/S08926875 00 000935 DeepDyve

A large proportion of the gold processed in the 21quot 39 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 .

Cyanide Leaching Of Gold Mine Engineer.Com

Carbonaceous gold ores can have the carbon adsorb the gold onto its surface, and as a result will not be recovered from the pregnant solution. Leaching gold from sulfide ores is difficult, at best. Generally, the recovery for cyanide leaching of sulfide or refractory ores is no better than 30, which is not a worthwhile venture.

Influence of copper minerals on cyanide leaching of gold

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 .

A Comparative Study of Sodium Cyanide and Jinchan TM Gold .

Cyanide leaching of gold in solutions containing sulfide. . shown that soluble sulfide hinders the rate of gold leaching, forming a protective layer of the type Au/Sx. . a detailed kinetic .

Effect of Dissolved Oxygen on PreOxidation and . OneMine

However, most of copper sulfide minerals dissolved well both in water and cyanide solutions, and copper from the minerals consumed DO and cyanide to oxidize and leach. Only in the presence of chalcopyrite, gold leaching was effectively occurred with increasing DO. However, chalcocite and covellite severely retarded gold leaching.

Predicting Cyanide Consumption in Gold Leaching: A Kinetic .

Anderson, C.G. Alkaline sulfide gold leaching kinetics. Miner. Eng. 2016, 92, 248256. Google Scholar Muir, D. A review of the selective leaching of gold from oxidised copperold ores with ammoniacyanide and new insights for plant control and operation. Miner. Eng. 2011, 24, 576582. Google Scholar

Pressure cyanide leaching for precious metals recovery .

A novel method demonstrates that the oxidation and dissolution of gold and silver in alkaline cyanide solution can be conducted simultaneously in the same autoclave in less than 90 minutes with a recovery that exceeds 96. Because mild operating conditions of 80 C and 0.6 MPa oxygen pressure are used in this process, low cost materials of construction can be utilized for the autoclave.

Biorecovery of nanogold and nanogold compounds from gold .

The gold remains in the solid residue from which is usually leached by cyanide. Gold leaching is possible also with cyanide generated by microorganisms, as well as by noncyanide agents, such as halide, thiourea, thiosulfate, and thiocyanate. The same treatments can be applied for the recovery of gold from various industrial goldcontaining wastes.

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The Cyanide Leaching Of Gold In Solutions Containing Sulfide