cyanide leaching gold in solutions containing sulfide

  • Home
  • >
  • cyanide leaching gold in solutions containing sulfide

The cyanide leaching of gold in solutions containing

2000-9-1  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

More

The cyanide leaching of gold in solutions containing

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 ...

More

10.1016/S0892-6875(00)00093-5 DeepDyve

2020-6-11  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 ...

More

The effect of sulfide minerals on the leaching of gold

2006-8-1  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.

More

Dissolution of gold in chalcopyrite-containing cyanide solutions

2020-6-10  JEFFREY M I, BREUER P L. The cyanide leaching of gold in solutions containing sulfide [J]. Minerals Engineering, 2000, 13(10): 1097–1106. Doi: 10.1016/S0892-6875(00)00093-5. Article Google Scholar [21] LORENZEN L, DEVENTER J S J V

More

A fundamental study of the alkaline sulfide leaching of gold

2015-12-27  this provides a simple way of producing a concentrated gold sample prior to leaching. It has also shown that gold can be selectively recovered from complex alkaline sulfide solutions containing a mixture of metals such as arsenic, tin, mercury and antimony. These studies showed that almost 100% of the gold

More

Precipitation of Mercury in Cyanide Gold Leaching

2018-9-5  Gold ore having 17 ppm mercury was leached with solutions containing 0.34 and 8 lb NaCN per ton of solution and lime, and then contacted with Na2S. The results of these tests are shown in figure 7. Increasing Na2S lowered mercury extraction when

More

A review of gold extraction using noncyanide lixiviants ...

2020-4-14  Alkaline sulfur-containing 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.

More

Leaching of gold and copper minerals in cyanide

2005-8-1  However, when leaching chalcocite in Cu(CN) 3 2− solutions, little sulfide was dissolved and gold leaching was found to be more rapid than for the free cyanide solution. Preliminary test work with gold ore samples containing CuO indicated that the initial kinetics of gold dissolution in air saturated Cu(CN) 3 2− solutions were comparable to ...

More

Cyanide Leaching Chemistry Gold Cyanidation

2015-2-6  Cyanide Leaching Chemistry Gold Cyanidation. The reactions that take place during the dissolution of gold in cyanide solutions under normal conditions have been fairly definitely established. Most agree that the overall cyanide equation for leaching and cyanidation of gold

More

10.1016/S0892-6875(00)00093-5 DeepDyve

2020-6-11  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 ...

More

elsners equation for cyanide leaching of gold

Cyanide leaching of gold in solutions containing sulfide The effect of sulfide minerals on the leaching of gold in aerated cyanide solutions this reaction occurs is known as the Elsner 1846 equation Jeffrey 2000 : . Effect of hydrogen peroxide and lead II nitrate on gold 21 Aug 2020 Cyanide lixiviant has been used as a leaching medium in the ...

More

Precipitation of Mercury in Cyanide Gold Leaching

2018-9-5  Gold ore having 17 ppm mercury was leached with solutions containing 0.34 and 8 lb NaCN per ton of solution and lime, and then contacted with Na2S. The results of these tests are shown in figure 7. Increasing Na2S lowered mercury extraction when low concentrations of cyanide (0.34 lb NaCN per ton of solution) were used.

More

Dissolution Of Sulphides Ore With Cyanide

Cyanide leaching of the concentrate was performed at 20%-w/w of solid 500 gram ofrefractory sulfide gold ore concentrate in a 2.5-liter glass reactor with aeration andstirred at 250 rpm. Leach solutions were prepared using deionized-distilled water at the

More

Dissolution of gold in chalcopyrite-containing cyanide

2020-6-4  decrease the leaching rate of gold [12, 13]. This is because most copper minerals are greatly soluble in cyanide solutions [14], and their dissolution consumes large amounts of cyanide and oxygen [15−17], thus reducing the concentration of the free

More

THE ALKALINE SULFIDE HYDROMETALLURGICAL

2009-8-19  sulfide solutions be recovered. As shown in Figure 3, gold is soluble in the alkaline sulfide system. Gold lixiviation is the result of leaching by polysulfides and sulfides as shown in equation 8. 2Au + S2 2-+ 2S2- 2AuS-+2S2-(8) Figure 3. Equilibrium Species Eh-pH Diagram for Sulfur and Alkaline Sulfide Gold

More

Predicting Cyanide Consumption in Gold Leaching: A

Gold is mainly extracted from its ores or concentrates by leaching with oxygenated cyanide solutions [1,2].Cyanide consumption during leaching, and the discharge of excess cyanide in wastewater, respectively constitute major economic [3,4] and environmental [] costs in the gold industry.Cyanide losses in the leaching stage mainly occur via the action of “cyanicides”: minerals, such as the ...

More

A Review on Alternative Gold Recovery Re-agents to

2016-8-18  By cyanide leaching besides gold also other heavy metals like arsenic, nickel, cadmium, cobalt, copper and mercury can be extracted from gold resources and these dissolved metals have crucial impacts on environment as well [18] . In areas near gold leaching industry cyanide can pass soil and even contaminate the underground water.

More

CHLORIDE HYPOCHLORITE OXIDATION AND LEACHING

2012-10-4  Chloride–hypochlorite oxidation and leaching of refractory sulfide gold concentrate 63 Fig. 1. The Pourbaix diagram of Fe–S at [Fe] –= 10 4 M, [S] = 10– M and 25 C (the chlorine species regions are also marked) (Marsden and House, 2005) Fig. 2.

More

AQUEOUS SOLUTIONS CONTAINING METAL

The cyanide content of 50 ppm by weight is then established with cyanide-containing wastewater. Column Experiments: Column experiments in which representative samples of the gold-containing rock are packed in columns and leached with alkaline cyanide solutions serve as a model of the heap leaching carried out industrially.

More

10.1016/S0892-6875(00)00093-5 DeepDyve

2020-6-11  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 ...

More

elsners equation for cyanide leaching of gold

Cyanide leaching of gold in solutions containing sulfide The effect of sulfide minerals on the leaching of gold in aerated cyanide solutions this reaction occurs is known as the Elsner 1846 equation Jeffrey 2000 : . Effect of hydrogen peroxide and lead II nitrate on gold 21 Aug 2020 Cyanide lixiviant has been used as a leaching medium in the ...

More

Dissolution Of Sulphides Ore With Cyanide

Cyanide leaching of the concentrate was performed at 20%-w/w of solid 500 gram ofrefractory sulfide gold ore concentrate in a 2.5-liter glass reactor with aeration andstirred at 250 rpm. Leach solutions were prepared using deionized-distilled water at the

More

Method to extract gold from telluride ores and

SUBSTANCE: method includes grinding of initial material, cyanide leaching with production of a product solution of gold with mercury admixtures, introduction of a sulfide-containing reagent for mercury deposition, sorption of gold onto activated coal with return of the reuse cyanide solution for leaching, desorption of gold and electrolysis of ...

More

Dissolution of gold in chalcopyrite-containing cyanide

2020-6-4  decrease the leaching rate of gold [12, 13]. This is because most copper minerals are greatly soluble in cyanide solutions [14], and their dissolution consumes large amounts of cyanide and oxygen [15−17], thus reducing the concentration of the free

More

THE ALKALINE SULFIDE HYDROMETALLURGICAL

2009-8-19  sulfide solutions be recovered. As shown in Figure 3, gold is soluble in the alkaline sulfide system. Gold lixiviation is the result of leaching by polysulfides and sulfides as shown in equation 8. 2Au + S2 2-+ 2S2- 2AuS-+2S2-(8) Figure 3. Equilibrium Species Eh-pH Diagram for Sulfur and Alkaline Sulfide Gold

More

A Review on Alternative Gold Recovery Re-agents to

2016-8-18  By cyanide leaching besides gold also other heavy metals like arsenic, nickel, cadmium, cobalt, copper and mercury can be extracted from gold resources and these dissolved metals have crucial impacts on environment as well [18] . In areas near gold leaching industry cyanide can pass soil and even contaminate the underground water.

More

Calcium Sulfide Precipitation of Mercury From Gold Silver ...

gold cyanide solutions (i-2). Silver sulfide would tie up considerable silver, and iron sulfide forms ferrocyanide, re­ sulting in cYanide loss. Calcium and so­ dium sulfides are effective in precipi­ tating mercury and are not harmful to the gold recovery process. Redissolution of mercury occurs when sodium sulfide is

More

US8038974B2 - Aqueous solutions containing metal

The present invention relates to solutions comprising water and at least one metal cyanide, at least a part of the water being obtained from wastewater which occurs as depleted wastewater in a process for extracting noble metals from noble metal-containing ores by the cyanide process, the process for the preparation of solutions according to the invention and to the use of the solutions ...

More

ANALYSIS OF CYANIDE IN MINING WATERS

2018-12-14  for the analysis of cyanide in solutions containing 50-100 ppm free cyanide. Furthermore, 0.000125 mol/liter silver nitrate is the most suitable concentration of the titrant in solutions containing 1-10 ppm free cyanide. Finally, the data were applied for the determination of free cyanide concentration in a synthetic mine water.

More

Cyanide Leaching Of Gold - Mine Engineer.Com

2013-1-3  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. The use of alkalies such as calcium oxide, will prevent the decomposition of cyanide in solution to form hydrogen cyanide

More

Dissolution Of Sulphides Ore With Cyanide

Cyanide leaching of the concentrate was performed at 20%-w/w of solid 500 gram ofrefractory sulfide gold ore concentrate in a 2.5-liter glass reactor with aeration andstirred at 250 rpm. Leach solutions were prepared using deionized-distilled water at the

More

Gold Agitation Cyanidation Leaching -

2019-10-18  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. The main equipment used in the agitation leaching process is a cyanide leaching tank.

More

Method to extract gold from telluride ores and

SUBSTANCE: method includes grinding of initial material, cyanide leaching with production of a product solution of gold with mercury admixtures, introduction of a sulfide-containing reagent for mercury deposition, sorption of gold onto activated coal with return of the reuse cyanide solution for leaching, desorption of gold and electrolysis of ...

More

Dissolution of gold in chalcopyrite-containing cyanide

2020-6-4  decrease the leaching rate of gold [12, 13]. This is because most copper minerals are greatly soluble in cyanide solutions [14], and their dissolution consumes large amounts of cyanide and oxygen [15−17], thus reducing the concentration of the free

More

THE ALKALINE SULFIDE HYDROMETALLURGICAL

2009-8-19  sulfide solutions be recovered. As shown in Figure 3, gold is soluble in the alkaline sulfide system. Gold lixiviation is the result of leaching by polysulfides and sulfides as shown in equation 8. 2Au + S2 2-+ 2S2- 2AuS-+2S2-(8) Figure 3. Equilibrium Species Eh-pH Diagram for Sulfur and Alkaline Sulfide Gold

More

Calcium Sulfide Precipitation of Mercury From Gold Silver ...

gold cyanide solutions (i-2). Silver sulfide would tie up considerable silver, and iron sulfide forms ferrocyanide, re­ sulting in cYanide loss. Calcium and so­ dium sulfides are effective in precipi­ tating mercury and are not harmful to the gold recovery process. Redissolution of mercury occurs when sodium sulfide is

More

Chemicals For Gold Leaching - fs-holland.nl

Leaching of gold and silver from printed circuit board of mobile phones. The commercial leachate used for comparison purposes was a chemical leacher (Galvastripper®) for gold and its alloys. This product is supplied as a liquid containing potassium cyanide in a concentration of 6 to 8%, slightly yellow, and removes up to 1 mm gold.

More

ANALYSIS OF CYANIDE IN MINING WATERS

2018-12-14  for the analysis of cyanide in solutions containing 50-100 ppm free cyanide. Furthermore, 0.000125 mol/liter silver nitrate is the most suitable concentration of the titrant in solutions containing 1-10 ppm free cyanide. Finally, the data were applied for the determination of free cyanide concentration in a synthetic mine water.

More

Associated Sulfide Minerals in Thiosulfate Leaching of ...

2020-2-24  leaching rate but also increase the consumption of thiosulfate. Comparable gold extractions were observed in the leaching of the composite ores containing various sulfide minerals, such as pyrite, pyrrhotite, chalcocite, galena and chalcopyrite. The leaching of gold in the presence of iron sulfides was also improved by

More