A lumped kinetic model for gold ore cyanidation

Lima, L. R. P. de Andrade; Hodouin, D.

doi:10.1016/j.hydromet.2005.06.001

Cited by 41 publications

(47 citation statements)

References 21 publications

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“…An average particle size of 0.015 mm is given to the <0.020 mm (´635 mesh) size fraction. These results are consistent with results reported by other authors [5] who assessed gold dissolution using mono-size samples. There is no systematic behaviour in Figure 4 that could provide grounds to consider that the production history of a size class of particles influences the gold dissolution within this size interval.…”

Section: Gold Dissolution As a Function Of Particle Sizesupporting

confidence: 93%

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Effect of Particle Size and Grinding Time on Gold Dissolution in Cyanide Solution

2016

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Abstract: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 ore sample, i.e., with the dissolved gold coming from the various sizes of particles carried by the ore. The results are consistent with the fact that gold dissolution increases with the decreasing particle size but results also indicate that gold dissolution of the ore within a size interval is not significantly affected by the grinding time used for the ore size reduction. Results also show a good dissolution of the gold contained in the fine-size fractions without oxidation and lead nitrate pre-treatment for an ore that is known to require such pre-treatment.

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Section: Gold Dissolution As a Function Of Particle Sizesupporting

confidence: 93%

“…The objective of the test work is to assess if gold dissolution as a function of particle size can be assessed from a natural ground ore rather than by using single-size ore particles [2,5]. The second Table 1.…”

Section: Objective Of the Test Workmentioning

confidence: 99%

Effect of Particle Size and Grinding Time on Gold Dissolution in Cyanide Solution

2016

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“…For example, Deschênes et al [7] showed that use of lead nitrate and oxygen (200 and 16 mg·L −1 , respectively) with high pyrite or chalcopyrite ores lowered cyanide consumption threefold and enhanced the gold leaching rate by 20%. There have also been many experimental investigations of the effects of varying solution chemistry and ore mineralogy on cyanide consumption [8]. On the other hand, there have been rather fewer efforts to develop models for estimating cyanide consumption under real leaching conditions.…”

Section: Introductionmentioning

confidence: 99%

“…For example, Adams [9,10] studied the effects of activated carbon on the kinetics of cyanide consumption in gold processing plants and showed it to be first order with respect to cyanide concentration, and that a carbon-catalyzed oxidation reaction was responsible for high cyanide losses. Bellec et al [11] proposed an empirical model that included ore particle size distribution, and cyanide, copper and sulfur concentrations, while De Andrade Lima and Hodouin [8] developed an empirical model that took into account ore particle size, cyanide concentration and the dissolution of sulfur-bearing minerals. However, these models were purely empirical, contained many parameters and were heavily case-dependent.…”

Section: Introductionmentioning

confidence: 99%

Predicting Cyanide Consumption in Gold Leaching: A Kinetic and Thermodynamic Modeling Approach

et al. 2018

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Abstract:The consumption of cyanide during processing operations is a major economic cost in the extraction of gold from its ores, while the discharge of cyanide wastes may result in significant environmental pollution. Many factors influence the levels of consumption and discharge of cyanide, including ore mineralogy and lixiviant solution chemistry. This paper proposes a robust methodology to estimate leaching cyanide consumption due to oxidation and reactions with gold, chalcopyrite and pyrite minerals forming various cyanide complexes, cyanate, thiocyanate and hydroxide precipitates of copper and iron. The method involves concurrent modelling of both the oxidation and leaching kinetics of minerals and the chemical speciation of the lixiviant solutions. The model was calibrated by conducting cyanide leaching experiments on pyrite, chalcopyrite, pyrite + chalcopyrite, pyrite + chalcopyrite + gold and pyrite + chalcopyrite + gold + quartz systems and determining the total Cu, Fe, Au and CN − concentrations in solution. We show that this model can successfully estimate the formation of cyanide complexes and, hence, the consumption of cyanide.

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“…7) Another kinetic study on the cyanidation of gold ore was also carried out. 8) However, the kinetic data and model analysis were not available for the other precious metals. Those works will not be reviewed further in this part because of the difference of the leaching system.…”

Section: Introductionmentioning

confidence: 99%

Kinetic Study on the Leaching of Pt, Pd and Rh from Automotive Catalyst Residue by Using Chloride Solutions

et al. 2006

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Recycling platinum group metals (PGMs) from waste and/or secondary resources is becoming quite important due to the limitation of the natural resource deposits of PGMs. Among the processes of PGMs' recycling from secondary resources, the hydrometallurgical method draws extensive concerns, particularly for the selection of leaching solution. The present work evaluated the ability of chloride leaching solutions, i.e. HCl-H 2 O 2 and NaClO-HCl-H 2 O 2 to extract Pt, Pd and Rh from a kinetic point of view. The effect of temperature in the range of 277-307 K and time were also examined under the conditions of À500 mm of particle size and 100 g L À1 of pulp density.The kinetic model (I):was found to be the most suitable to describe the leaching process of Pt, Pd and Rh in the NaClO contained solution. In this model the interface transfer and diffusion across the leached support layer both affect the rate of leaching reaction.fits the kinetic data very well for the dissolution of Pd in the HCl-H 2 O 2 solution, showing that the diffusion across the leached support layer mainly affect the kinetic behaviors and the diffusion coefficient is inversely proportional to leaching time t. The NaClO contained solution and HCl-H 2 O 2 solution leaching of Pt, Pd and Rh are strongly dependent on the leaching temperature. In the case of the NaClO contained solution, the activation energy based on model (I) for Pd, Pt and Rh was 63.5, 59.1 and 77.9 kJ mol À1 , respectively. It is probably because of that the diffusion of NaClO contained solution across the leached support layer was very slow due to the micro-porous structure of the catalyst; and a high activation energy was needed in effect. Regarding to the leaching in the HCl-H 2 O 2 solution, the activation energy for Pd was 13.4 kJ mol À1 on the basis of model (II).

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A lumped kinetic model for gold ore cyanidation

Cited by 41 publications

References 21 publications

Effect of Particle Size and Grinding Time on Gold Dissolution in Cyanide Solution

Effect of Particle Size and Grinding Time on Gold Dissolution in Cyanide Solution

Predicting Cyanide Consumption in Gold Leaching: A Kinetic and Thermodynamic Modeling Approach

Kinetic Study on the Leaching of Pt, Pd and Rh from Automotive Catalyst Residue by Using Chloride Solutions

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