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the effect of cyanide in the gold dissolution

  • CDC Facts About Cyanide

    In manufacturing cyanide is used to make paper textiles and plastics. It is present in the chemicals used to develop photographs. Cyanide salts are used in metallurgy for electroplating metal cleaning and removing gold from its ore. Cyanide gas is used to exterminate pests and vermin in ships and buildings.

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  • Effect of lead(II) compounds on the rate of cyanide

    Effect of lead(II) compounds on the rate of cyanide dissolution of gold Article in Russian Journal of General Chemistry 77(1) 1-9 · January 2007 with 19 Reads How we measure reads

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  • Kinetics and Mechanism of Gold and Silver Dissolution In

    Kinetics and Mechanism of Gold and Silver Dissolution In Cyanide Solution

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  • The Comparation of Cyanide and CNLITE Gold Leaching Reagent

    Jan 17 2020 · It should be pointed out that according to the basic reaction formula of cyanide-dissolving gold the theoretical dissolution of 1 gram of gold requires only 0.49 g of Sodium cyanide but in actual production the actual consumption is more than 200 times the theoretical consumption due to mechanical and chemical losses.

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  • Use in Mining International Cyanide Management Code

    Gold and silver are not soluble in water. A complexant such as cyanide which stabilizes the gold and/or silver species in solution and an oxidant such as oxygen are required to dissolve these metals.The amount of cyanide in solution required for dissolution may be

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  • Gold cyanidationWikipedia

    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.

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  • Effect of Particle Size and Grinding Time on Gold

    The recovery of gold by ore leaching is influenced by the size of the particles and the chemical environment. The effect of particle size on the dissolution of gold is usually studied using mono-size particles as the gold in solution comes from the ore of a unique leached particle size. This paper proposes a method to estimate the gold dissolution as a function of particle size using a bulk

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  • The leaching and adsorption behaviour of gold ores

    THE LEACHING AND ADSORPTION BEHAVIOUR OF GOLD ORES Kevin Lee Rees 2.2.4 Factors affecting gold dissolution 19 2.3 MINERALOGY AND REFRACTORINESS 21 2.3.1 Mineralogy 22 2.4.2 Effect of zinc cyanide species on gold leaching 2.4.3 Other metal-cyanide complexes

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  • Cyanide Chemistry International Cyanide Management Code

    Cyanide Species. The term cyanide refers to a singularly charged anion consisting of one carbon atom and one nitrogen atom joined with a triple bond CN-. The most toxic form of cyanide is free cyanide which includes the cyanide anion itself and hydrogen cyanide HCN

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  • Cyanide Chemistry International Cyanide Management Code

    Cyanide Species. The term cyanide refers to a singularly charged anion consisting of one carbon atom and one nitrogen atom joined with a triple bond CN-. The most toxic form of cyanide is free cyanide which includes the cyanide anion itself and hydrogen cyanide HCN

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  • Copper and Cyanide Recovery in Cyanidation Effluents

    free cyanide ions in solution can only be provided at a pH of 9.0. The pH of the pulp can be increased adding alkalis (e.g. Ca(OH)2 NaOH etc.) known as protective alkalis. It is accepted that gold dissolution in cyanide solutions occurs as a sequence of two reactions as shown in Equations (1) and (2). These reactions apply to silver as well.

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  • Review of the Impact on Water Quality and Treatment

    The main merits of cyanidation are the high selectivity of free cyanide for gold dissolution compared to other metals and an extremely high stability constant (2 10 38) of the gold cyanide complex .. Dilute sodium cyanide solutions within concentration ranges of 0.01–0.05 are used in mines for gold leaching .Gold ore is subjected to physical processes such as milling grinding and

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  • A Kinetic and Thermodynamic Modeling Approach

    Minerals 2018 8 110 3 of 13 The dissolution kinetics and equilibria of copper iron and gold species in cyanide solutions are closely related to the concentration of free cyanide CN and pH.

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  • diameter particle of gold cyanide

    The gold particle size has a tremendous effect on the time required for dissolution in a cyanide solution. Generally the finer the gold the quicker it will dissolve. A 45 micron particle of gold would dissolve in 10 13 hours while a 150 micron particle might take from 20 to

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  • The effect of flotation collectors on the electrochemical

    This result suggests that pyrite has a positive effect on gold leaching due to galvanic interactions even in the presence of collector. The legitimate question as to which extent the effect of collector on gold dissolution differs when added in cyanide solution or during the conditioning step is worth addressing.

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  • Electrochemical preparation of potassium gold cyanide

    The essential requirements for the industrial preparation of potassium gold cyanide (PGC) are (a) high rate of dissolution and (b) smooth and uniform dissolution. Employing galvanostatic and potentiostatic polarisation data and observations on the surface

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  • Gold Silver Dissolution and Cyanide Concentration

    Effect of Cyanide Concentration on Rate of Gold and Silver Dissolution. The rate of dissolution of gold in cyanide solutions attains a maximum in passing from concentrated to dilute solutions. His work shows that this maximum is reached at a solution concentration of 0.25 NaCN.

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  • INFLUENCE OF PRE-AERATION ON CYANIDE LEACHING OF A

    The effect of hydrogen peroxide on gold leaching is a controversy subject. According to Zurilla et al. (1978) and Kirk et al. (1978) the dissolution rate of gold in oxygen–free solutions containing hydrogen peroxide is very slow and the oxide layer formation on gold surface prevents gold leaching to take place. Other studies showed

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  • Kinetic Investigation and Dissolution Behavior of Cyanide

    May 10 2019 · Since these two reagents are the most promising cyanide alternatives for gold ores a gold-silver alloy was used to see the effect of alloying elements onto the dissolution reaction.

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  • Kinetics of natural degradation of cyanide from gold mill

    After zinc addition gold is precipitated from a gold-cyanide complex. Waste streams from the process generally contain a sufficiently high concentration of cyanide and heavy metals that treatment is essential. The oldest treatment method practiced by Canadian gold mines for cyanide destruction is "natural degradation".

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  • The effect of activated carbon on the rate of dissolving

    the effect of the presence of activated carbon on the rate of charcoal on the rate of dissolution of gold in very dilute cyanide solutions (3) to devise a method for detecting the presence of any undissolved gold in the concentrate obtained from the flotation of carbon from a gold ore pulp.

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  • INFLUENCE OF SILVER ALLOYING AND IMPURlTIESON THE

    Effect of other impurities in cyanide solutions containing lead 56 4.3.6. Combination of cathodic reduction of oxygen and anodic dissolution of gold and gold-l 0 silver alloy in the presence of lead 58 4.4. Conclusions 62 CHAPTER 5. INFLUENCE OF SULPHIDE IONS ON THE DISSOLUTION OF GOLD AND GOLD -10 SILVER ALLOY IN CYANIDE SOLUTIONS 64 5.1.

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  • Sodium cyanide NaCNPubChem

    Sodium cyanide NaCN or CNNa CID 8929structure chemical names physical and chemical properties classification patents literature biological activities

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  • Effect of lead nitrate on cyanidation of gold ores

    Oct 01 2000 · In a cyanide solution lead nitrate lead sulphide and lead sulphite react with gold to form AuPb 2 AuPb 3 and metallic lead which clearly accelerate the gold dissolution. The nature of the sulphide minerals affects the formation of lead or lead alloys on the gold surface.

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  • Anodic Dissolution of Gold in Cyanide Solutions Effect of

    At more positive potentials the temperature dependence of the gold dissolution rate reflects the temperature effect on competitive adsorption of cyanide and hydroxide ions the surface development during electrolysis and the accumulation of the cyanide

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  • Effects of sulphide minerals and dissolved DeepDyve

    Read "Effects of sulphide minerals and dissolved oxygen on the gold and silver dissolution in cyanide solution Minerals Engineering" on DeepDyve the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

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  • Gold leaching in cyanide-starved copper solutions in the

    of glycine where the solution is cyanide starved. The effect of glycine addition on gold leaching kinetics in cop-per–cyanide solutions under different leaching conditions was studied. The results show that in the presence of glycine gold dissolution rate increases significantly in solutions containing copper–cyanide species at a very

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  • Electrochemical preparation of potassium gold cyanide

    The essential requirements for the industrial preparation of potassium gold cyanide (PGC) are (a) high rate of dissolution and (b) smooth and uniform dissolution. Employing galvanostatic and potentiostatic polarisation data and observations on the surface

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  • A Study of the Effect of Djurliete Bornite and

    A Study of the Effect of Djurliete Bornite and Chalcopyrite during the Dissolution of Gold with a Solution of Ammonia-Cyanide Guy Deschênes 1 Hai Guo 2 Chen Xia 1 Allen Pratt 1 Mike Fulton 1 Yeonuk Choi 3 and Judith Price 1 1 CanmetMining 555 Booth Street Ottawa Ontario K1A 0G1 Canada E-Mails cxia nrcan.gc.ca

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  • The effect of pyrite particle size on the electrochemical

    Cyanide leaching tests have revealed that pyrite has a positive galvanic effect on gold dissolution. Highest gold dissolution 98 was achieved at a pyrite particle size of 75–106 μm. Coarser size fractions of pyrite 106 μm resulted in a significant decrease in gold dissolution

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  • The leaching and adsorption behaviour of gold ores

    THE LEACHING AND ADSORPTION BEHAVIOUR OF GOLD ORES Kevin Lee Rees 2.2.4 Factors affecting gold dissolution 19 2.3 MINERALOGY AND REFRACTORINESS 21 2.3.1 Mineralogy 22 2.4.2 Effect of zinc cyanide species on gold leaching 2.4.3 Other metal-cyanide complexes

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  • Kinetics of natural degradation of cyanide from gold mill

    After zinc addition gold is precipitated from a gold-cyanide complex. Waste streams from the process generally contain a sufficiently high concentration of cyanide and heavy metals that treatment is essential. The oldest treatment method practiced by Canadian gold mines for cyanide destruction is "natural degradation".

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  • Leaching Adsorption Resource Book

    CIL technology is based on the fact that the gold dissolves readily in cyanide solutions in the presence of oxygen and the resultant gold cyanide complex ion (molecule) is readily adsorbed onto activated carbon. The dissolution of gold takes place via the following reaction REACTANTS PRODUCTS

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  • Minerals Free Full-Text A Study of the Effect of

    Sulphide and copper compounds (cyanide and sulphide) were reaction products responsible for inhibiting the dissolution of gold. Lead nitrate added in the Hunt leaching of bornite produced 99 gold extraction. Surface reaction products were similar to djurleite. The cyanide consumption ( 4.4 kg/t NaCN) was not reduced by the addition of ammonia.

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  • Gold leaching in cyanide-starved copper solutions in the

    This paper presents a process to enhance the dissolution of gold using copper-cyanide solutions in the presence of glycine where the solution is cyanide starved. The effect of glycine addition on gold leaching kinetics in copper-cyanide solutions under different leaching conditions was studied.

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  • INFLUENCE OF SILVER ALLOYING AND IMPURlTIESON THE

    Effect of other impurities in cyanide solutions containing lead 56 4.3.6. Combination of cathodic reduction of oxygen and anodic dissolution of gold and gold-l 0 silver alloy in the presence of lead 58 4.4. Conclusions 62 CHAPTER 5. INFLUENCE OF SULPHIDE IONS ON THE DISSOLUTION OF GOLD AND GOLD -10 SILVER ALLOY IN CYANIDE SOLUTIONS 64 5.1.

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