the cyanide leaching of gold in solutions containing sulfide

  • The cyanide leaching of gold in solutions containing sulfide

    A large proportion of the gold processed in the 21 st 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 Au/S x.

  • Cyanide leaching of gold in solutions containing sulfide

    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

  • Precipitating Gold From Cyanide Solution

    Gold Leaching In Cyanide-Starved Copper Solutions In The. 2017-10-4of glycine where the solution is cyanide starved. The effect of glycine addition on gold leaching kinetics in cop-percyanide solutions under different leaching conditions was studied. Read More; Dissolve Gold Into Cyanide Solution Gold

  • (PDF) A Fundamental Study of the Alkaline Sulfide Leaching

    To date, cyanide-assisted gold leaching has been considered to be the predominant method for gold extraction owing to its Cyanide leaching of gold in solutions containing sulfide. Article. Sep

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

    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

  • Leaching of gold and copper minerals in cyanide deficient

    2005-08-01· 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 free cyanide.

  • Dissolution of gold in chalcopyrite-containing cyanide solutions

    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

  • Alkaline Sulfide Gold Leaching Kinetics Request PDF

    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

  • A fundamental study of the alkaline sulfide leaching of gold

    2015-12-27· 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.

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

    2006-08-01· 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.

  • Alkaline Sulfide Gold Leaching Kinetics Request PDF

    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

  • Influence of copper minerals on cyanide leaching of gold

    However, when leaching chalcocite in Cu(CN)32− solutions, little sulfide was dissolved and gold leaching was found to be more rapid than for the free cyanide solution.

  • (PDF) RECOVERY OF SILVER FROM CYANIDE LEACH

    This solution was produced by cyanide leaching of a pyritic gold concentrate (62 g/t) containing high levels of silver (110 g/t) (3 g/L NaCN, pH 10.5-11, %35 w/w, 20°C, 24 h and 10 L).

  • the process of extracting gold from sulphide

    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

  • Copper Sulfide Containing

    Cyanide leaching of gold in solutions containing . Cyanide leaching of gold in solutions containing sulfide. Severe interference by the copper containing sulphides with cyanide leaching of gold is observed at ρ(NaCN)≤5 g/L. This is consistent with speciation calculations. Ammonia pretreatment is shown to readily eliminate the copper

  • Kinetic Investigation and Dissolution Behavior of Cyanide

    Thiosulfate is the most promising non-cyanide leaching reagent and the only reagent which found industrial application on gold recovery from a highly carbonaceous preg-robbing gold ore at Barrick Gold. Besides this, the nontoxic reagent is highly discussed and there is a multitude of publications and conference papers presenting auspicious results, also for different gold containing

  • Calcium Sulfide Precipitation of Mercury During Cyanide Leaching of Gold

    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 stone 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

  • A review of gold extraction using noncyanide lixiviants:

    The average leaching rate of gold in an alkaline solution containing 1 mol·L −1 thiosulfate and 0.1 mol·L −1 sodium hydroxide was less than 10 −11 mol·cm −2 ·s −1 in the potential range of 0.20 to 0.35 V, which was relatively lower than that in aerated cyanide solutions (5 × 10 −9 mol·cm −2 ·s −1) [88, 98].

  • Gold cyanidation Wikipedia

    2020-08-02· 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 reagents for mineral processing to recover gold, copper,

  • Sulphide Gold Ore Treatment by Leaching and Flotation

    2020-07-29· Problem with gold recovery from sulphide ore: How may a mill get the maximum recovery of gold from a sulphide ore, at the least capital cost and at the same time obtain the highest net return. This latter point is most important. In many cases a gold mill using an all-cyanide flowsheet with fine grinding of all the ore will report very low gold

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