Extraction of Gold from Refractory Gold-Bearing Ores by Means of Reducing Pyrometallurgical Selection

Seisembayev, R. S.; Kozhakhmetov, S. M.; Kvyatkovsky, SA; Semenova, A. S.

doi:10.1007/s11015-020-01055-z

Metallurgist

2020

DOI: 10.1007/s11015-020-01055-z

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Extraction of Gold from Refractory Gold-Bearing Ores by Means of Reducing Pyrometallurgical Selection

R. S. Seisembayev

S. M. Kozhakhmetov

SA Kvyatkovsky

et al.

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Prospects for refractory gold-sulfide ore processing

Grigoreva,

Boduen

2024

Izv.VUZ. Tsvet. Met.

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Cyanide-refractory ores constitute 30 % of the world’s gold mineral resource base. With the global decrease in the availability of high-grade and free-milling ores, low-quality ores, including those rich in sulfur and arsenic, are increasingly being processed. The authors have conducted an assessment of the primary factors complicating the leaching process of refractory gold. These factors include the influence of gold distribution within the ore, the presence of preg-robbing effects, and the impact of cyanicidal minerals, notably pyrrhotite, on the leaching process. Sulfide minerals significantly affect the kinetics of gold leaching and associated reagent costs. The behavior of Fe5S6 is elucidated through the concept of “chemical depression”. Under cyanide leaching conditions, pyrrhotite actively and directly reacts with NaCN/KCN, undergoing surface oxidation by dissolved oxygen in the pulp. This leads to the formation of ferrocyanide complexes and rhodanides, which are unable to leach gold. Presently, there are two approaches to enhance the process parameters of refractory ore processing technology. The first approach involves the inclusion of preparation operations for cyanidation, aimed at liberating gold from the sulfide matrix (including hydrometallurgical and pyrometallurgical oxidation technologies and mechanical activation). An alternative approach is to use alternative reagents as leaching agents (notably thiourea, sodium and ammonium thiosulfates, and halides). The article explores means of modifying the technological process for gold extraction when ores contain substantial amounts of pyrrhotite or concentrates.

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Prospects for refractory gold-sulfide ore processing

Grigoreva,

Boduen

2024

Izv.VUZ. Tsvet. Met.

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An Environmentally Benign Approach for Gold Recovery From Gold-Bearing Ore: Modeling and Optimization

Muanda¹,

Omalanga²,

ANNYFA³

et al. 2023

EJMSE

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The current work focuses on the extraction of gold using alpha-cyclodextrin (α-CD) from the Kimpese quarry in the Democratic Republic of the Congo, through an environmentally friendly gold process as an alternative to the amalgamation process. The ore was sampled and characterized using atomic absorption spectroscopy (AAS) prior to the experiments, and the analysis revealed 0.08% of gold. The ore was then leached with modified aqua regia (MAR). Time, HBr concentration, pH, and stirring speed were all varied during leaching to highlight the parameters that influence the leaching yield. The optimum conditions were determined using analysis of variance (ANOVA) and response surface methodology (RSM), implying time, HBr concentration, pH, and stirring speed of 6 hours, 80g/l, 1, and 800rpm, respectively, and a leaching percentage of 98.6928%. Following leaching, neutralization tests with potassium hydroxide (KOH) were performed by varying the following parameters: time, KOH concentration, and pH. The following factors were varied in the extraction tests after neutralization: time, α-CD concentration, pH. The optimal parameters were as follows: time of 30 minutes, α-CD concentration of 8.8639g/l, and pH of 6, with yield of 89.7350%. This method of recovering gold from ore using α-CD is inexpensive and does not harm the environment.

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Extraction of Gold from Refractory Gold-Bearing Ores by Means of Reducing Pyrometallurgical Selection

Cited by 2 publications

References 1 publication

Prospects for refractory gold-sulfide ore processing

Prospects for refractory gold-sulfide ore processing

An Environmentally Benign Approach for Gold Recovery From Gold-Bearing Ore: Modeling and Optimization

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