Pulp mineralogy and chemistry, leaching and rheological behaviour relationships of refractory gold ore dispersions

Asamoah, Richmond K.; Skinner, William; Addai‐Mensah, Jonas

doi:10.1016/j.cherd.2019.04.001

Cited by 16 publications

(4 citation statements)

References 22 publications

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“…In our previous papers, the ore mineralogical and physico-chemical characteristics, gold mineralisation and deportment in host gangue minerals, effect of selected process variables on the kinetics and mechanism of alkaline cyanide leaching and temporal rheological behaviour, and refractory attenuation capability of mechano-chemical activation technique have been investigated, attempting to address critical questions and aspects of poor process performance [17][18][19][20][21][22][23]. This paper, therefore, aims at 1.…”

Section: Figurementioning

confidence: 99%

Specific Refractory Gold Flotation and Bio-Oxidation Products: Research Overview

Asamoah

2021

Minerals

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This paper presents a research overview, reconciling key and useful case study findings, towards uncovering major causes of gold refractoriness and maximising extraction performance of specific gold flotation and bio-oxidation products. Through systematic investigation of the ore mineralogical and gold deportment properties, leaching mechanisms, and kinetic behaviour and pulp rheology, it was observed that the predominant cause of the poor extraction efficacy of one bio-oxidised product is the presence of recalcitrant sulphate minerals (e.g., jarosite and gypsum) produced during the oxidation process. This was followed by carbonaceous matter and other gangue minerals such as muscovite, quartz, and rutile. The underpining leaching mechanism and kinetics coupled with the pulp rheology were influenced by the feed mineralogy/chemistry, time, agitation/shear rate, interfacial chemistry, pH modifier type, and mechano-chemical activation. For instance, surface exposure of otherwise unavailable gold particles by mechano-chemical activation enhanced the gold leaching rate and yield. This work reflect the remarkable impact of subtle deposit feature changes on extraction performance.

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Section: Figurementioning

confidence: 99%

Specific Refractory Gold Flotation and Bio-Oxidation Products: Research Overview

Asamoah

2021

Minerals

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“…A study conducted by Calvo et al [3] revealed that the average copper grade is constantly reducing overtime (25% reduction in just 10 years) with increasing energy consumption (46% energy increase) and total material production (30% production increase). The continuous increase in production (2%-3% per year forecasted production increase between 2010 and 2050) due to rising demand [4] requires more efficient methods across the mineral-processing value chain (e.g., comminution, flotation, and hydrometallurgy) while eliminating process waste [5][6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…Froth flotation has seen remarkable widespread applications in the mineral industry for different highly valuable commodities (e.g., copper, gold, zinc, and rare earth elements) [14][15][16][17][18][19][20][21]. The interdependence of the process variables extends performance challenges to the flotation process where a change in feed mineralogy requires a corresponding change in the other flotation variables for an optimal outcome [22][23][24][25][26][27][28][29][30][31]. Failure to properly adjust the flotation conditions may result in a concentrate dilution and recovery of waste minerals which could contribute negatively to downstream unit efficacy and financial loss [28,32,33].…”

Section: Introductionmentioning

confidence: 99%

Prediction and Optimisation of Copper Recovery in the Rougher Flotation Circuit

Amankwaa-Kyeremeh,

McCamley,

Zanin

et al. 2023

Minerals

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In this work, the prediction and optimisation of copper flotation has been conducted in the rougher flotation circuit. The copper-recovery prediction involved the application of support vector machine (SVM), Gaussian process regression (GPR), multi-layer perceptron artificial neural network (ANN), linear regression (LR), and random forest (RF) algorithms on 15 rougher flotation variables at the BHP Olympic Dam. The predictive models’ performance was assessed using linear correlation (r), root mean square error (RMSE), mean absolute percentage error (MAPE), and variance accounted for (VAF). A simulated annealing (SA) optimisation algorithm, particle swarm optimisation (PSO) algorithm, surrogate optimisation (SO) algorithm, and genetic algorithm (GA) were investigated, using the GPR predictive function, to determine the optimal operating condition for maximising copper recovery. The predictive function of the best-performing model was extracted and used in optimising the flotation circuit. The results showed that the GPR model developed with the matern 3/2 kernel function makes the most precise copper-recovery prediction as compared to the other investigated predictive models, obtaining r values > 0.96, RMSE values < 0.42, MAPE values < 0.25%, and VAF values > 94%. A hypothetical optimisation solution assessment showed that SA provides the best set of solutions for the maximisation of rougher copper recovery, obtaining a throughput of 638.02 t/h and a total net gain percentage of 14%–15.5% over the other optimisation algorithms with a maximum copper recovery of 94.76%. The operational benefits of implementing these algorithms have been highlighted.

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“…Анализируя работы разных авторов [10,13,14,16,19], можно утверждать, что увеличивающийся объем окисленных и смешанных руд, поступающих на переработку, усложняет технологию и ухудшает технико-экономические показатели обогащения сырья.…”

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Studies of enrichment of sulfide and oxidized ores of gold deposits of the Aldan shield

Федотов

Сенченко²,

Федотов

et al. 2020

PMI

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The paper presents the analysis of studies of the enrichment of sulfide and oxidized ores in Yakutia deposits. The ore of the deposit is a mixture of primary, mixed and oxidized ores. The main useful component of the studied ore samples is gold with a content of 1.5 to 2.8 g/t, the silver content is low – 5-17 g/t. Ore minerals are represented by sulfides, among which pyrite predominates. The total sulfide content does not exceed 3-5 %. The presence in the ore of free and associated gold with a grain size from fractions of a micron to 1.5 mm. Gold is represented by nuggets in intergrowth with sulfides and also forms independent inclusions. Ores are classified as easily cyanidable. It was found that the content of amalgamable gold is 10-49, the share of cyanidable gold ranges from 66.67-91, the share of refractory gold is 9.0-33.33 %, which in absolute amount equals to 0.24-0.8 g/t. The extraction of gold in gravitation concentrate varies depending on the gold content in the ore and the yield of concentrate and for ores with a gold content of 1.5-2.8 g/t from 40 to 60 %. The direct cyanidation of all studied ore samples established the possibility of extracting gold into solution up to 86.7-92.9 %, the gold content in cyanidation cakes is 0.2-0.3 g/t. Investigations of the gravitation concentrate by the method of intensive cyanidation showed that with an initial gold content of ~ 500 g/t, up to 98.9 % is extracted into the solution. The gold content in intensive cyanide cakes will be 6-15 g/t. A set of studies carried out by the authors of the article at various institutes showed that it is advisable to process ore from the deposit using cyanidation technology with preliminary gravitational extraction of gold.

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Pulp mineralogy and chemistry, leaching and rheological behaviour relationships of refractory gold ore dispersions

Cited by 16 publications

References 22 publications

Specific Refractory Gold Flotation and Bio-Oxidation Products: Research Overview

Specific Refractory Gold Flotation and Bio-Oxidation Products: Research Overview

Prediction and Optimisation of Copper Recovery in the Rougher Flotation Circuit

Studies of enrichment of sulfide and oxidized ores of gold deposits of the Aldan shield

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