sodium sulfite and gold leaching

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Enhancement of gold extraction from biooxidation residues ...

Feb 01, 2001  Figure 1 demonstrates that lixiviant containing sodium sulphite can significantly accelerate the gold leaching process. To reach a 93% gold extraction, the leaching time was shortened by almost 5 hours when sodium sulphite was present. Furthermore, the presence of sodium sulphite could also greatly reduce the consumption of thiourea (Figure 2).

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Study on mechanism of gold leaching by thiourea in the ...

高达10%返现  In the presence of sodium sulphite, the effective concentration of thiourea is increased and the dissolution rate of gold in thiourea solution is greatly increased. The activation energy required for gold dissolution in thiourea solution with sodium sulphite is 20.9 kJmol−1 in the absence of sodium sulphite.

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Leaching Kinetics of Antimony from Refractory Gold Ore in ...

Dec 01, 2020  The leaching kinetics of antimony from refractory gold ore in alkaline sodium sulfide was investigated under ultrasound. The influence of factors such as stirring speed, temperature, the concentration of sodium hydroxide and sodium sulfide and particle size, was studied. The leaching kinetics has also been studied under convention and ultrasound.

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Method for extraction of gold and silver from technogenic ...

Aug 01, 2019  The most promising results were obtained utilizing solution with sodium sulfite and sodium sulfate concentration of 25 g/L and leaching time – 1 hour. Under these conditions, the extraction of gold was 67%. The use of sodium sulphate and sodium sulfite allows to extract gold and partially silver from refractory sulfide ores.

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sodium sulfite and gold leaching

The method of extracting gold from telluride ores and concentrates, including cyanide leaching, characterized in that prior to cyanide leaching is carried out restoration processing of the feedstock solution containing sodium sulfite as a reducing agent, followed by separation of the solution from the cake, to the which is subjected to cyanide

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Enhancement of gold extraction from biooxidation residues ...

Feb 01, 2001  Figure 1 demonstrates that lixiviant containing sodium sulphite can significantly accelerate the gold leaching process. To reach a 93% gold extraction, the leaching time was shortened by almost 5 hours when sodium sulphite was present. Furthermore, the presence of sodium sulphite could also greatly reduce the consumption of thiourea (Figure 2).

More

Method for extraction of gold and silver from technogenic ...

Aug 01, 2019  The most promising results were obtained utilizing solution with sodium sulfite and sodium sulfate concentration of 25 g/L and leaching time – 1 hour. Under these conditions, the extraction of gold was 67%. The use of sodium sulphate and sodium sulfite allows to extract gold and partially silver from refractory sulfide ores.

More

Enhancement of Gold Extraction from Biooxidation Residues ...

The presence of sodium sulfite can significantly reduce thiourea decomposition, accelerate the gold dissolution process, decrease the leaching time, and decrease the activation energy of gold ...

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Dissolution of Silver and Gold with Sodium Hypochlorite ...

Apr 15, 2020  Two-stage leaching was carried out: first to eliminate manganese from the sample using sodium sulfite (Na 2 SO 3) as a reductive reagent and sulfuric acid (H 2 SO 4) and a second stage to dissolve silver and gold with sodium hypochlorite (NaClO) and hydrochloric acid (HCl); the results show extraction around 96% for Mn and 98.73% and 83% of Ag ...

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role of sodium metabisulfite in gold recovery

Leaching of an oxide gold ore with chloride/hypochlorite solutions. ... to achieve maximum gold recovery of 58% compared to sodium ... of sodium metabisulfite to ... Inquire Now; Cyanide Detoxification: Inco Sulfur Dioxide/Air . Conservation and Recovery Act ... application of sodium sulfite or sodium

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THE ALKALINE SULFIDE HYDROMETALLURGICAL SEPARATION ...

essentially a mixture of sodium sulfide and sodium hydroxide. This is a unique hydrometallurgical system as it is a very selective lixiviant for the distinct leaching of tin, gold, antimony, arsenic and mercury (1,2,3,4,5,6,7). Worldwide, it is employed industrially in the CIS, China and the United States for the production of antimony.

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Selective Pre-leaching of Tellurium From Telluride-Type ...

Mar 25, 2021  This process first concentrates telluride-type gold ore, then follows by oxidative roasting, cyanide leaching, polysulfide leaching, sodium sulfite reduction, and other processes to recover tellurium and gold (Zhou and Chen, 2008). This method has a complicated process and high investment cost, and is difficult to apply to other processing plants.

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Basic theory and optimization of gold containing antimony ...

As sodium sulfide is easily oxidized to polysulfide and thiosulfate which have a gold leaching effect, gold would dissolve in leaching solution when extracting stibium from gold containing antimony concentrate by alkaline sulfide. Through leaching test and kinetics analysis, the decomposition regularity of sodium sulfide and leaching rate were ...

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CN101157986A - Rapid nontoxic gold extracting method ...

The invention relates to a wet gold extraction method, and is a quick and non-toxic gold extraction method. The method uses the solution of sodium bromate, sodium chloride and vitriol as the gold leaching solution, polyurethane foam as the substance to absorb gold, sodium sulfite solution as a desorption agent, oxalic acid as a reducing agent, hydrochloride solution as recycling agent of ...

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Dissolution Behavior of Gold in Alkaline Media Using Thiourea

Therefore, sodium sulfite allows obtaining the Au-TU complex defining an important condition in the use of thiourea for leaching gold in an alkaline medium. Figure 5(b) shows that the dissolution of gold increases as the presence of sodium sulfite also increases. 4. Conclusions

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Method of gold extraction from sulphide gold-bearing ores

Then it is implemented recovery of heavy-basic anionite by solution of mixture of sulfite and sodium sulfide and ammonium. After recovery of heavy-basic anionite it is directed to sorption of thiosulfate-gold. EFFECT: acceleration of leaching, increasing of yield of gold and reduction of consumption of leaching

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Frontiers Selective Pre-leaching of Tellurium From ...

Mar 25, 2021  This process first concentrates telluride-type gold ore, then follows by oxidative roasting, cyanide leaching, polysulfide leaching, sodium sulfite reduction, and other processes to recover tellurium and gold (Zhou and Chen, 2008). This method has a complicated process and high investment cost, and is difficult to apply to other processing plants.

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DISSOLUTION OF SILVER AND GOLD WITH SODIUM

Two-stages leaching was carried out, first to eliminate manganese from the sample using sodium sulfite (Na2SO3) as a reductive reagent and sulfuric acid (H2SO4), a second stage to dissolve silver and gold with sodium hypochlorite (NaClO) and hydrochloric acid (HCl), the results shows extraction around 96% for Mn, 98.73% and 83% of Ag and Au ...

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Dissolution Behavior of Gold in Alkaline Media Using Thiourea

Therefore, sodium sulfite allows obtaining the Au-TU complex defining an important condition in the use of thiourea for leaching gold in an alkaline medium. Figure 5(b) shows that the dissolution of gold increases as the presence of sodium sulfite also increases. 4. Conclusions

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Basic theory and optimization of gold containing antimony ...

As sodium sulfide is easily oxidized to polysulfide and thiosulfate which have a gold leaching effect, gold would dissolve in leaching solution when extracting stibium from gold containing antimony concentrate by alkaline sulfide. Through leaching test and kinetics analysis, the decomposition regularity of sodium sulfide and leaching rate were ...

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Thiosulphate Stability In Gold Leaching Process

Ammonium thiosulphate is an alternative gold leaching Laaviant used to replace cyanide. The current problem of thiosulphate gold leaching is the high reagent consumption, To understand the decomposition chemistry of thiosulphate, solution ... 5.4.1 Effects Of Sodium Sulphite ..... 5-98 5.4.2 EffectsOfSodiumSulphate ..... 5-99 Effect Of Pulp ...

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Method of gold extraction from sulphide gold-bearing ores

Then it is implemented recovery of heavy-basic anionite by solution of mixture of sulfite and sodium sulfide and ammonium. After recovery of heavy-basic anionite it is directed to sorption of thiosulfate-gold. EFFECT: acceleration of leaching, increasing of yield of gold and reduction of consumption of leaching

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US6126807A - Process for making sodium gold sulfite ...

A process for producing sodium gold sulfite in solution is described. The sodium gold sulfite solution is useful in gold electroplating baths, and can be used in applications which require pure, soft gold deposits. A process is also described whereby the sodium gold sulfite solution can be solidified by a freeze-drying process.

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THE ALKALINE SULFIDE HYDROMETALLURGICAL SEPARATION ...

essentially a mixture of sodium sulfide and sodium hydroxide. This is a unique hydrometallurgical system as it is a very selective lixiviant for the distinct leaching of tin, gold, antimony, arsenic and mercury (1,2,3,4,5,6,7). Worldwide, it is employed industrially in the CIS, China and the United States for the production of antimony.

More

Selective Pre-leaching of Tellurium From Telluride-Type ...

Mar 25, 2021  This process first concentrates telluride-type gold ore, then follows by oxidative roasting, cyanide leaching, polysulfide leaching, sodium sulfite reduction, and other processes to recover tellurium and gold (Zhou and Chen, 2008). This method has a complicated process and high investment cost, and is difficult to apply to other processing plants.

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A Method for Leaching or Dissolving Gold From Ores or ...

Aug 18, 2005  The hydrometallurgical leaching of native gold from gold-bearing ores or the dissolution of gold metal during the recycling of electronic and precious metal scrap is performed every day using ...

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How is Sodium Cyanide Consumed during Gold Cyanidation ...

Aug 21, 2020  Sodium cyanide is the most commonly used leaching chemical in gold extraction process. According to theoretical calculation, leaching 1 gram of gold only requires 0.5 grams of sodium cyanide. However, in most gold cyanidation plants, the consumption of cyanide is high, which is 50-100 times higher than the theoretical calculation.

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Pre-Reducing Process Kinetics to Recover Metals from ...

Sodium sulfite was used to reduce the potential of solution, converting ferric iron to ferrous iron, while the reducing process was studied before using sodium dithionite and sodium metabisulfite [19, 20, 29]. Three synthetic solutions were prepared to simulate real conditions of nickel laterite leach

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Using Thiosulphate as Gold Leaching Agent in a Brazilian ...

Sodium sulphite (Gold Leach Solution AMX-CT80): 1.5 e 0.75 kg/t ore. Initially ammonia dosage was not fixed, being adjusted according to initial pH, which should be close to 10. Subsequently, to ...

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Frontiers Selective Pre-leaching of Tellurium From ...

Mar 25, 2021  This process first concentrates telluride-type gold ore, then follows by oxidative roasting, cyanide leaching, polysulfide leaching, sodium sulfite reduction, and other processes to recover tellurium and gold (Zhou and Chen, 2008). This method has a complicated process and high investment cost, and is difficult to apply to other processing plants.

More

DISSOLUTION OF SILVER AND GOLD WITH SODIUM

Two-stages leaching was carried out, first to eliminate manganese from the sample using sodium sulfite (Na2SO3) as a reductive reagent and sulfuric acid (H2SO4), a second stage to dissolve silver and gold with sodium hypochlorite (NaClO) and hydrochloric acid (HCl), the results shows extraction around 96% for Mn, 98.73% and 83% of Ag and Au ...

More

The Leaching Gold and Silver from E-Waste by LSSS Method

Abstract-A new hydrometallurgical recovery of leaching gold and silver from E-waste has been presented by Lime Sulfur Synthetic Solution (LSSS) method. The influences of sodium sulfite concentration, divalent copper ions concentration, aqueous ammonia concentration, reaction temperature and leaching time were investigated experimentally. The results indicated that it was favorable ...

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