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The leaching and adsorption behaviour of gold ores

The leaching and adsorption behaviour of gold ores

4.3 CYANIDE LEACHING OF THE COPPER CONCENTRATE 92 4.3.1 The effect of copper 101 4.3.2 The role of iron 106 4.3.3 The role or nickel 107 4.3 .4 The role of silver 109 4.3.5 Theroleofzinc 109 4.4 THE EFFECT OF COPPER CYANIDE ON GOLD LEACHING FROM OXIDE AND SULPHIDE ORES 110 4.5 SUMMARY 114 CHAPTERS PREGROBBING PHENOMENA IN THE

Effect of Particle Size and Grinding Time on Gold

Effect of Particle Size and Grinding Time on Gold

minerals Article Effect of Particle Size and Grinding Time on Gold Dissolution in Cyanide Solution Jessica Egan 1, Claude Bazin 2,* and Daniel Hodouin 2 1 Produits Chimiques Magnus, Boucherville, QC J4B 5Z5, Canada; [email protected] 2 Department of Mining, Metallurgical and Materials Engineering, Laval University, Quebec, QC G1V 0A6, Canada; [email protected]

Gold leaching in cyanidestarved copper solutions in the

Gold leaching in cyanidestarved copper solutions in the

the glycine concentration up to 1 g/L and any further glycine addition has a negative effect on the dissolution of gold. Increasing leaching pH up to 12 enhances gold dissolution in the coppercyanideglycine solutions. However, increasing leaching pH to 13 has an adverse effect on the dissolution of gold.

INFLUENCE OF LEAD NITRATE ON CYANIDE LEACHING OF

INFLUENCE OF LEAD NITRATE ON CYANIDE LEACHING OF

cyanide leaching by addition of 300 g/Mg lead nitrate to the leach slurry. Furthermore, numerous studies have shown that lead nitrate addition reduces the detrimental effect of metallic sulfides, increases gold leaching recovery and/or inhibits the dissolution of metallic sulfides, thus reduces cyanide consumption (Deschenes et al., 2003).

Experimental study in the rapid dissolution of gold in

Experimental study in the rapid dissolution of gold in

Effect of Pulp Dilution on Dissolution Rate of Gold Lamb 3 indicated that the rapid rate of dissolv­ ing gold inva fastspeed flotation cell was partially due to the more dilute pulp (4 tons of solution to 1 ton of solids) used by him. In current cyanide practice pulp dilutions

INFLUENCE OF LEAD NITRATE ON CYANIDE LEACHING OF

INFLUENCE OF LEAD NITRATE ON CYANIDE LEACHING OF

cyanide leaching by addition of 300 g/Mg lead nitrate to the leach slurry. Furthermore, numerous studies have shown that lead nitrate addition reduces the detrimental effect of metallic sulfides, increases gold leaching recovery and/or inhibits the dissolution of metallic sulfides, thus reduces cyanide consumption (Deschenes et al., 2003).

MODELING OF GOLD CYANIDATION

MODELING OF GOLD CYANIDATION

The chemistry of gold dissolution in alkaline cyanide solution has continually received attention and new rate equations expressing the gold leaching are still developed. The effect of leaching parameters on gold cyanidation is studied in this work in order to optimize the leaching process. A gold leaching model, based on

The Effect of Temperature on the Rate of Dissolution of

The Effect of Temperature on the Rate of Dissolution of

The Effect of Temperature on the Rate of Dissolution of Gold in Cyanide Solutions Which Have A Constant Oxygen Content. Introducti,.on Since the development of cyanid.ationinto a highly efficient proces for t~eating gold ores, many papers have been written on its various aspects. Although, there has been much work done on it, the

The effect of sulfide minerals on the leaching of gold in

The effect of sulfide minerals on the leaching of gold in

Aug 01, 2006· 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

Experimental study in the rapid dissolution of gold in

Experimental study in the rapid dissolution of gold in

due to the higher cyanide concentrations used when a given amount of cyanide was dissolved in less water. Effect of Varying Quantity of Air. Four methods were used to determine qualitatively the general effect of varying quantities of air on the rate of dissolving gold. The smallest quantity of air used was

Effect of Silver in Thiosulfate Leaching of GoldSilver

Effect of Silver in Thiosulfate Leaching of GoldSilver

In this paper, the dissolution rate of pure gold, pure silver, and goldsilver alloys of silver compositions, 4, 8, 20, and 50 wt% are reported. The effects of various parameters on the rate of gold and silver dissolution have been determined. The results show that the pure silver dissolution rate is around 6.89 times greater than pure gold.

Cyanide control in the metallurgical process of gold

Cyanide control in the metallurgical process of gold

Cyanide control in the metallurgical process of gold extraction in AngloGold (S.A.) Influence of oxygen Whilst cyanide is one of the major drivers if not the major driver of gold dissolution, it cannot be viewed in isolation particularly in respect to the relationship between cyanide and

Kinetics and Mechanism of Gold and Silver Dissolution InEstimated Reading Time 12 mins

Kinetics and Mechanism of Gold and Silver Dissolution In

Decrease in rate of gold dissolution at high speeds of agitation and at two different cyanide concentrations.................. 13 6. Effect of cyanide concentration on the rate of

Estimated Reading Time 12 mins
Gold Silver Dissolution and Cyanide Concentration

Gold Silver Dissolution and Cyanide Concentration

Feb 07, 2015· In comparing the dissolving effects of the cyanides of ammonium, sodium, potassium, magnesium, calcium, strontium and barium on gold and silver it was found that the alkaline radical did not affect the dissolving effect of the particular cyanide. The cyanogen content was the only significant factor affecting dissolution.

Cyanide Gold Dissolution Mineral Processing Metallurgy

Cyanide Gold Dissolution Mineral Processing Metallurgy

Jul 27, 2016· The first of the series of experiments had to do with the effect of cyanide concentration on the rate of dissolution of gold and silver. In plant practice, the solution strength for gold approximates 0.05 per cent NaCN, or 1 lb. cyanide per ton solution.

Effect of Metal Impurities on Adsorption of Gold by

Effect of Metal Impurities on Adsorption of Gold by

ed to give an initial free cyanide concentration of 0.5 gIL. The effect of the cyanide complex impurities on carbon adsorption of gold was determined by adding sodium gold cyanide to the synthetic feed solution, producing a gold concentration of 150 ppm. This concentration is signif. icantly higher than metal concentrations normally encoun­

Effects of Potassium Nitrate (Sa ltpetre) On Gold Cyanidation*

Effects of Potassium Nitrate (Sa ltpetre) On Gold Cyanidation*

gold cyanidation process to effect gold dissolution. The role of oxygen in cyanide leaching is extensively explained in literature; (Arslan et al., 2003; Marsden and House, 2006). Oxygen is known to increase the gold dissolution rate in gold cyanidation process (Guzman et al., 1999; Kondos et al., 1995; Kondos et al., 1996). The current

gold cyanide gold posoda.eu

gold cyanide gold posoda.eu

Effect of Particle Size and Grinding Time on Gold Dissolution MDPI. Jul 7 2016 The effect of particle size on the dissolution of gold is usually studied Keywords gold ore leaching cyanide particle size laboratory testing

Optimizing and evaluating the operational factors

Optimizing and evaluating the operational factors

Dec 08, 2015· Two of the main advantages of cyanidation are the selectivity of free cyanide for gold dissolution and the extremely high stability of the cyanide complex . The most important disadvantages of this process are the toxicity and disposal problems of leaching wastes into the environment unless the necessary precautions are taken.

Cyanide Gold Dissolution Mineral Processing MetallurgyEstimated Reading Time 10 mins

Cyanide Gold Dissolution Mineral Processing Metallurgy

This insoluble residue has no effect whatever on the dissolution of gold and silver and will not precipitate precious metals already in solution. It is, therefore, not necessary to remove it. The recommended procedure for introducing cyanide into a cyanidemill circuit is to provide a tank of sufficient size so that enough cyanide can be dissolved at one time to furnish the mill requirements for at least one shift.

Estimated Reading Time 10 mins
Anodic Dissolution of Gold in Cyanide Solutions Effect of

Anodic Dissolution of Gold in Cyanide Solutions Effect of

It is shown that a temperature increase has a complex effect on the anodic dissolution of gold. At negative potentials (in the standard hydrogen scale), in the absence of heavy metals, the effective activation energy for the dissolution is close to 48 kJ/mol and weakly depends on the polarization. At more positive potentials, the temperature dependence of the gold dissolution rate reflects the

Effect of Oxygen on Gold LeachingEstimated Reading Time 2 mins

Effect of Oxygen on Gold Leaching

Effect of Oxygen on Gold Leaching. In simplified terms, the Effect of Oxygen on Gold Leaching can be summarized in saying The dissolution rate of gold in alkaline cyanide solutions under atmospheric conditions, and at practical cyanide levels, is directly proportional to the dissolved oxygen concentration. The rate of dissolution of gold in alkaline cyanide solution is dependent on a number of factors, principally the solution

Estimated Reading Time 2 mins
 Copper interaction during the dissolution of gold

Copper interaction during the dissolution of gold

The dissolution of copper minerals generally proceeds more rapidly (due to their higher concentration in the ores) than for gold, thus necessitating the free cyanide level to be maintained high enough in the pulp for gold to be extracted from the ores.The leached copper cyanide also interacts with the extraction of gold in several ways.

Effect of arsenicantimony mineral on cyanide leaching

Effect of arsenicantimony mineral on cyanide leaching

Arsenate and thioarsenate in solution can form a covering film on the surface of gold and silver, which hinders the dissolution of gold and silver. Therefore, arsenicbearing ore is difficult to be leached directly by cyanidation, which is usually treated by oxidation roasting and then cyanide leaching.

A Study of the Effect of Oxygen on the Rate of Dissolution

A Study of the Effect of Oxygen on the Rate of Dissolution

THE EFFEC1' OF OXYGENON TIlE RATE OF DISSOLUTION OF GOLD IN CYANIDE 50LUT10NS pl·' Theacoepted chemical reactions in the dissolution of gold by oyanlde so·lutions requir~ the »resenae of' gold, cyanide, wa.tar., and. o~gen. The importanoe of 'dissolved oxygen in eyanld.e solutions as a faotor is recognl!2ledby aJ,l the oompetent meta

effect of cyanide in dissolution of gold

effect of cyanide in dissolution of gold

Dec 27, 2019· effect of cyanide in dissolution of gold_The Metallurgy of Cyanide Gold LeachingAn Introduction Oct 20, 2014· Nature of Gold The surface of a gold particle will typically be dissolved at a rate of around 0.20.5 µm of s

Gold leaching in cyanidestarved copper solutions in the

Gold leaching in cyanidestarved copper solutions in the

Jul 01, 2015· The effect of glycine addition on gold leaching kinetics in coppercyanide solutions under different leaching conditions was studied. The results show that, in the presence of glycine, gold dissolution rate increases significantly in solutions containing coppercyanide species at a very low, or zero, free cyanide concentration.

4 Reasons and Solutions of Poor Gold Leaching Effect

4 Reasons and Solutions of Poor Gold Leaching Effect

Jun 22, 2020· Some gold ores are accompanied by copper and zinc minerals, such as malachite, azurite, pyrocopper and sphalerite (especially oxidized sphalerite), etc., which have high solubility in cyanide solution. While leaching gold, they will compete with gold for cyanide and oxygen, thus hindering the dissolution of gold and reducing the

The effects of dissolved oxygen and cyanide dosage on gold

The effects of dissolved oxygen and cyanide dosage on gold

The effect of heavy metalscontaining gold ore mineralogy on gold oxidation kinetics in solutions with various free cyanide (CN) and dissolved oxygen (DO) concentrations was studied by

Gold Metallurgy Leaching in CyanicidesEstimated Reading Time 11 mins

Gold Metallurgy Leaching in Cyanicides

It is shown that the reaction between cyanide and the sulphides present in an ore is accelerated by increase in temperature. While the rate of dissolution of gold is also increased, this effect is more than offset by the oxidation of the sulphur compounds and utilization of available oxygen.

Estimated Reading Time 11 mins

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