leaching kinetics of gold copper ores

leaching kinetics of gold copper ores

Gold and copper leaching from gold-copper ores and ...

May 01, 2017  It is well known that cyanide soluble copper dissolves in cyanide solutions to form toxic copper-cyanide complexes such as Cu(CN) 2 −, Cu(CN) 3 2 −, Cu(CN) 4 3 −.A number of studies have been published to treat gold-copper ores by either adding ammonia to the conventional cyanidation process, or recycling cyanide after the leaching stage (La Brooy et al., 1991, Muir et al., 1991, Muir et ...

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Leaching of gold from a free milling gold ore in copper ...

Aug 15, 2020  Based on the results of gold extraction at different temperature (Fig. 5a), the leaching kinetics of gold ore in copper-citrate-thiosulfate solutions is a parabolic leaching process. Considering the fact that the change in agitation speed does not significantly affect the leaching kinetics ( Fig. 4 ), it is reasonable to assume that the product ...

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Leaching of gold and copper minerals in cyanide deficient ...

Aug 01, 2005  Kinetics of gold and copper dissolution from a gold–copper oxide ore using free cyanide and Cu(CN) 3 2−. Fig. 10 shows similar gold and copper leach rates with a second iron oxide rich gold ore containing 1.4 g/t Au and 0.18% Cu as copper oxide from Ernest Henry.

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Leaching of gold from a free milling gold ore in copper ...

The results of kinetic analysis of dissolution rate of gold indicate the leaching process gold from free milling ores may be controlled by the product layer diffusion under the experimental conditions, with an activation energy of 34.48 kJ/mol.

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The leaching and adsorption behaviour of gold ores

4.4 the effect of copper cyanide on gold leaching from oxide and sulphide ores 110 4.5 summary 114 chapters preg-robbing phenomena in the cyanidation of gold ores 116 5.1 objectives of this chapter 116 5.2 background information 116 5.3 preg-robbing behaviour by the ores

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Leaching of Gold with Copper-citrate-thiosulfate Solutions

The results of kinetic analysis of dissolution rate of gold indicate the leaching process gold from free milling ores may be controlled by the product layer diffusion under the experimental ...

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Gold-Copper Ores - ScienceDirect

Jan 01, 2016  Copper-gold ore leaching: kinetic study on the ammoniacal cyanidation of copper, chalcocite and chalcopyrite. Proceedings 1997 AusIMM Annual Conference, The Australasian Institute of Mining and Metallurgy, Melbourne (1997), pp. 291-297. View Record in Scopus Google Scholar.

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The treatment of copper–gold ores by ammonium thiosulfate ...

Oct 01, 2002  Either way, loss of reactants results in slower leaching kinetics. It is evident from Eq. (6) ... The experiments indicate that aeration is a key control parameter during the leaching of a copper–gold ore in an ammonium thiosulfate solution. High initial gold extractions but low final gold concentrations were achieved in a forced aerated system.

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LEACHING OF LOW-GRADE COPPER ORES: A CASE STUDY

minerals). The leaching experiments were performed using sulphuric acid solutions, whereby the kinetics of copper leaching was investigated with respect to acid concentration and solid to liquid ratio. The copper concentration in the leach solution ranged from 0.80 to 1.75 g dm-3. The total Cu recovery rate ranged from 30 to 56 %, whereas the

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Leaching of Gold with Copper-citrate-thiosulfate Solutions

The results of kinetic analysis of dissolution rate of gold indicate the leaching process gold from free milling ores may be controlled by the product layer diffusion under the experimental ...

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Thiosulfate Leaching of Gold from Copper Bearing Ores

May 26, 2018  The recovery of gold and silver from a copper-bearing gold ore sample obtained from southern New Mexico was investigated using agitation leaching, bottle-roll and column leach techniques. These experiments were carried out with a low grade ore analyzing 2.1 g/t Au (0.061 ± 0.008 oz/ton) , 56.7 g/t Ag (1.65 ± 0.12 oz/ton), and 0.86% acid ...

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Alkaline Sulfide Gold Leaching Kinetics - ResearchGate

Alkaline Sulfide Gold Leaching Kinetics C.G. Anderson1 ... is copper bearing ores. III. Components of the ore may absorb or precipitate the dissolved gold cyanide complex

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Predicting Cyanide Consumption in Gold Leaching: A Kinetic ...

Anderson, C.G. Alkaline sulfide gold leaching kinetics. Miner. Eng. 2016, 92, 248–256. [Google Scholar] Muir, D. A review of the selective leaching of gold from oxidised copper-old ores with ammonia-cyanide and new insights for plant control and operation. Miner. Eng. 2011, 24, 576–582. [Google Scholar]

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leaching of copper gold ore by ammoniacal cyanide leaching ...

The ore body is a complex copper-gold porphyry deposit, comprising intermixed oxidized, transition and sulphidic gold and copper-bearing ores. Gold in the sulphide ores is generally not refractory and is recoverable by cyanide leaching, but the secondary copper minerals, which are also cyanide soluble, lead to high cyanide consumptions.

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LEACHING OF LOW-GRADE COPPER ORES: A CASE STUDY

minerals). The leaching experiments were performed using sulphuric acid solutions, whereby the kinetics of copper leaching was investigated with respect to acid concentration and solid to liquid ratio. The copper concentration in the leach solution ranged from 0.80 to 1.75 g dm-3. The total Cu recovery rate ranged from 30 to 56 %, whereas the

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Kinetic and equilibrium effects in gold ore cyanidation ...

Aug 01, 2008  Cyanide leaching of two West African gold ores was studied in multiple laboratories to provide process-engineering data for plant design purposes. Unusually slow leach extraction kinetics were observed using routine cyanide leach test procedures with pregnant solution monitoring. Carbon-in-leach testing, however, showed normal rapid kinetic behavior, with the same ultimate gold

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A Kinetic and Thermodynamic Modeling Approach

Keywords: leaching; gold ores; cyanide; modelling; consumption; kinetics; speciation 1. Introduction 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

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Comparative Study of Gold Extraction from Refractory ...

May 07, 2020  Sonora, Mexico has several deposits considered rich in precious metals such as gold, silver, and copper. Several mining projects in the state have found unique refractory ores that are not technically or economically treatable under conventional extraction processes [1,2,3].Researchers have sought economical and efficient solutions to these problems.

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Adsorption of Gold and Copper from Alkaline Glycine-based ...

Owing to its ability to form stable complexes with gold and copper, glycine has been proposed as a promising potential alternative lixiviant. Progress into the understanding of glycine leaching behaviour of copper minerals and gold-copper ores has been made. However, a comprehensive study on the subsequent treatment

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Leaching kinetics of near infrared sensor-based pre ...

Keywords: leaching, copper ore, sensor-based, pre-concentration, kinetics Introduction Most of the world high-grade copper resources are dwindling due to growing exploitation to meet global demand owing to technological advancement (Haque et al., 2014). With most copper ore body increasingly becoming complex due to high

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(PDF) Cyanidation of gold ores containing copper, silver ...

Cyanidation of gold ores containing copper, silver, lead, arsenic and antimony. Download. ... Improved gold and silver extraction from a refractory antimony ore by pretreatment with alkaline sulphide leach. By Haci Deveci and ibrahim alp. Implementation of sodium hydroxide pretreatment for refractory antimonial gold and silver ores.

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A comprehensive study of the leaching behavior and ...

The leaching behavior of an Iranian copper oxide ore in sulphuric acid was investigated in detail to evaluate the influence of various factors, to optimize the dissolution conditions and to determine the kinetics of the leaching. The results indicated that the increase in the leaching time and temperature enhanced the leaching rate of copper.

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A model for the bacterial leaching of copper sulfide ores ...

A model for the bacterial leaching of copper sulfide ores in pilot-scale columns. Jorge Castillo. Related Papers. A comprehensive model for copper sulphide heap leaching. By Mark Cross. Computational modeling of reactive multi-phase flows in porous media: Applications to metals extraction and environmental recovery processes.

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Leaching Kinetics of Gold Involved in the System S2O32 ...

Abstract: Thiosulphate gold leaching is an alternative technology to the cyanidation of gold ores. Ethylenediaminetetraacetic acid is referred to as EDTA.A study on the leaching kinetics of gold involved in the system S 2 O 3 2--EDTA-Cu 2+ for the gold in this paper. The effect of temperature and of the addition of copper has been also analyzed, temperature has a remarkable effect over the ...

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Leaching of Gold with Copper-citrate-thiosulfate Solutions

The results of kinetic analysis of dissolution rate of gold indicate the leaching process gold from free milling ores may be controlled by the product layer diffusion under the experimental ...

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THE STUDY OF THE KINETICS OF GOLD LEACHING IN THE

2.4.2. Direct leaching 27 2.4.3. Kinetics studies of the thiosulfate leaching of gold from ores and concentrates 30 2.4.4. The kinetics of gold leaching studied by Tozawa et al (1981) 32 2.4.5. Mechanism of silver sulfide dissolution 34 2.4.6. Electrochemical investigation of gold leaching

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Thiosulfate Leaching of Gold from Copper Bearing Ores

May 26, 2018  The recovery of gold and silver from a copper-bearing gold ore sample obtained from southern New Mexico was investigated using agitation leaching, bottle-roll and column leach techniques. These experiments were carried out with a low grade ore analyzing 2.1 g/t Au (0.061 ± 0.008 oz/ton) , 56.7 g/t Ag (1.65 ± 0.12 oz/ton), and 0.86% acid ...

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Modelling and simulation of gold ore leaching

calibrated and validated on batch leaching tests. Gold grain surface accessibility to reagents Depending on their degree of accessibility, gold grains have different leaching kinetics. When gold is directly exposed to the surrounding phase it has a fast leaching kinetic. On the other hand, gold attacked through ore porosity, like in

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STUDIES ON THE CURING AND LEACHING KINETICS OF

accelerate the extraction kinetics of copper ores and is widely used in copper operations. The curing process involves the addition of a highly concentrated sulfuric acid to the copper ore during agglomeration. Then, chemical reactions already begin prior to irrigation of the heap, transforming the initial copper species into new copper species

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Predictive Models of Leaching Processes: A Critical Review

describes the leaching of gold ores. An improved shrinking core model with variable activation energy was developed for kinetic modelling of manganese ore leaching [4]. Reference [5] adopted the shrinking core model to develop a mathematical model for zinc ore leaching. Recent applications

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(PDF) An Overview of Treatment of Copper-gold Ores

Copper minerals present difficulties during the cyanide leaching of gold ores leading to excessively high consumption of cyanide (and oxygen) coupled with low extraction of gold.

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Acid leaching of oxide–sulfide copper ore prior the ...

The kinetics of copper minerals leaching was recently published by several authors, for example Sokić at al. kinetics of copper leaching from chalcopyrite [7], Bingol and Canbazoglu kinetics of copper leaching from mala-chite [10,11], while Quast has published the kinetics of copper leaching from atacamite [12]. Also some res-earchers studied ...

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Effect of Lead Nitrate on Gold Leach Kinetics ...

Lead Nitrate addition in CIL operations and how the dosage of Pb Lead nitrate affects gold leaching kinetic rates. The main aim for adding lead nitrate is to help in Gold dissolution in CIL plants. Should the gold solid tails be the main aim for dosing lead nitrate in the treatment of slightly compl

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[PDF] Gold leaching by copper(II) in ammoniacal ...

Gold leaching in thiosulphate media has attracted renewed interest of many researchers over the last three decades due to fast kinetics in the presence of some oxidants/ligands and its adaptability to gold ores which are unsuitable for direct cyanidation. The acidity (pH) and the concentrations of copper(II), ammonia, thiosulphate and polythionates produced by the reaction between copper(II ...

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[PDF] Leaching of gold ores with high cyanicides: a ...

Processing of gold ores with high sulfide minerals is problematic as they consume cyanide and reduce gold leaching. Optimization of gold leaching and cyanide consumption requires a methodology to estimate the amount of exposed cyanicides, their leaching kinetics, and speciation of cyanide complexes that consume the free cyanide and compete with gold.

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(PDF) Industrial Application of Ammonia Assisted Cyanide ...

Treatment of copper-rich gold ore by cyanide leaching, ammonia pretreatment and ammoniacal cyanide leaching. Trans. Nonferrous Met. Soc. China, 25, 597-607 Costello M.C., Ritchie I.C., Lunt D.J., 1992. Use of ammonia–cyanide leach system for copper–gold ores with reference to the re-treatment of the TORCO tailings.

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Leaching of a pyrite-based ore containing copper using ...

Jun 24, 2020  For example, the presence of copper in gold- and silver-containing ores originates a high consumption of cyanide during gold leaching and decreases the kinetics of the process, which may render the process unviable economically .

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