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

Egan, Jessica; Bazin, C.; Hodouin, D.

doi:10.3390/min6030068

Cited by 15 publications

(7 citation statements)

References 5 publications

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“…For example, in the flotation process, it has been found that extremely fine particles (e.g., <20 µm) have lower collision efficiency with bubbles and this results in losses of valuable minerals [42]. In addition, regarding the leaching process, although finely ground raw material with large surface area is usually required for efficient extraction of valuable metals, recent research studies indicate that for certain ores there is a specific size fraction for which a maximum leaching rate is observed [43,44]. In this context, the AR method may be used to determine the optimal parameters of the grinding process, i.e., residence time, media/feed size, and media filling ratio, which maximize the desired size range of grinding products [23,[44][45][46][47][48].…”

Section: Introductionmentioning

confidence: 99%

Effect of Grinding Media Size on Ferronickel Slag Ball Milling Efficiency and Energy Requirements Using Kinetics and Attainable Region Approaches

Petrakis

Komnitsas

2022

Minerals

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The aim of this study is to evaluate the effect that the size of grinding media exerts on ferronickel slag milling efficiency and energy savings. A series of tests were performed in a laboratory ball mill using (i) three loads of single size media, i.e., 40, 25.4, and 12.7 mm and (ii) a mixed load of balls with varying sizes. In order to simulate the industrial ball milling operation, the feed to the mill consisted of slag with natural size distribution less than 850 μm. Grinding kinetic modeling and the attainable region (AR) approach were used as tools to evaluate the data obtained during the ball milling of slag. Particular importance was given to the determination of the specific surface area of the grinding products, the identification of the grinding limit, and the maximum specific surface area which could be achieved when different grinding media sizes were used. The results showed that, in general, the breakage rates of particles obey non-first-order kinetics and coarse particles are ground more efficiently than fines. The AR approach proved that there is an optimal grinding time (or specific energy input) dependent on the ball size used for which the volume fraction of the desired size class is maximized. The use of either 25.4 mm balls or a mixed load of balls with varying sizes results in 31 and 24% decrease in energy requirements, compared to the use of balls with small size (12.7 mm).

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Section: Introductionmentioning

confidence: 99%

Effect of Grinding Media Size on Ferronickel Slag Ball Milling Efficiency and Energy Requirements Using Kinetics and Attainable Region Approaches

Petrakis

Komnitsas

2022

Minerals

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“…In previous decades, the extraction of gold was performed from gold ores by using cyanide leaching [42,43]. Due to the environmental issues of cyanide, of halides, aqua regia, thiosulfate and thiourea are now used as alternative materials [44].…”

Section: Introductionmentioning

confidence: 99%

Low-cost synthesis of AuNPs through ultrasonic spray pyrolysis

Tiyyagura

Majerič

Anžel

et al. 2020

Mater. Res. Express

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The present research informs about the synthesis of gold nanoparticles (AuNPs) through Ultrasonic Spray Pyrolysis (USP), which were collected in ethanol with 0.1% Polyvinylpyrrolidone (PVP). Initially, the research focused on two precursors, where the first represented a homemade H-HAuCl 4 , completed in our own laboratory through the chlorine gas method by using HCl and KMnO 4 , and the second was the commercial C-HAuCl 4 , prepared by using Gold (III) chloride tetrahydrate powder and deionised water. The goal was to find any potential precursor differences and their influences on the later use for AuNPs synthesis through USP using almost the same parameters. In the first step of research it was determined that the H-HAuCl 4 precursor was similar to C-HAuCl 4 in chemical composition, surface tension and pH value. This finding represented the starting point for being able to use H-HAuCl 4 in the USP for AuNPs' synthesis. In the second step, AuNPs were synthesised from both types of precursors. Afterwards, characterisation of some functional properties by FTIR and UVvis techniques was done directly for H-and C-AuNPs in the collecting media. For SEM/EDX and TEM microscopy both types of H-and C-AuNPs were dried, and observation revealed that the morphology, shape and size distribution of dried AuNPs were very similar. Based on the performed laboratory research, it could be concluded that prepared H-AuNPs could represent a new and lowcost effective solution for future USP transfer onto the industrial level, not only in in the process itself, but also in the field of Low-cost Precursor Preparation.Abbreviations

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“…Numerous applications to flotation processes (Trahar, 1981;Bazin and Proulx, 2000) and hydrocyclones (Laplante and Finch, 1984) operation are found in the literature. Some results are also found for gold leaching (Egan et al, 2013) and hydraulic classification (Bazin et al, 2012). However few papers were found to describe the operation of spirals in terms of partition curves (Atasoy and Spottiswood, 1995;Holland-Batt and Holtham, 1991;Richards et al, 2000).…”

Section: Introductionmentioning

confidence: 89%

Size recovery curves of minerals in industrial spirals for processing iron oxide ores

Bazin

Sadeghi

Bourassa³

et al. 2014

Minerals Engineering

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

Cited by 15 publications

References 5 publications

Effect of Grinding Media Size on Ferronickel Slag Ball Milling Efficiency and Energy Requirements Using Kinetics and Attainable Region Approaches

Effect of Grinding Media Size on Ferronickel Slag Ball Milling Efficiency and Energy Requirements Using Kinetics and Attainable Region Approaches

Low-cost synthesis of AuNPs through ultrasonic spray pyrolysis

Size recovery curves of minerals in industrial spirals for processing iron oxide ores

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