Two-step oxidation of a refractory gold-bearing sulfidic concentrate and the effect of organic nutrients on its biooxidation

Muravyov, Maxim; Булаев, А. Г.

doi:10.1016/j.mineng.2013.02.007

Cited by 56 publications

(24 citation statements)

References 19 publications

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“…At present the methods of bioleaching of gold from ores using basically known acidophilic bacteria, which were extracted from different sources, or the use of microbial consortia of acidophilic bacteria are widely applied [13][14][15][16]32]. Before using such bacteria there must be time for their adaptation to new conditions.…”

Section: Discussionmentioning

confidence: 99%

“…During the last 65 years, different bioleaching technologies have been developed and/or enhanced to extract Co, Ni, Cu, and Zn [8,9] as well as Au [10,11]. They include some new constructions (bioreactors), tested under laboratory and pilot conditions, but are not extensively used in industry [12] during the application of Acidithiobacillus ferrooxidans [13,14], Chromobacterium violaceum [15], Sulfobacillus thermosulfidooxidans, and A. caldus [16]. It is evident that extraction of gold from refractory lean raw materials by means of bioleaching will minimize the harm caused to the environment and make cheaper the processing of sulfide ores and technogenic wastes.…”

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confidence: 99%

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Bioleaching of Au-Containing Ore Slates and Pyrite Wastes

et al. 2019

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The influence of the environment and bacterial cultures on the degree of gold leaching from Au-containing raw materials of different compositions, origins, and with different contents of gold, selected in the Ural Federal District (Russia), was determined. The leaching degree was determined according to the change of the gold concentration in the ore by means of mass-spectrometry with inductively-coupled plasma. It was demonstrated that the degree of Au bioleaching from carbonaceous-argillaceous slates, containing 2.17 g/t of gold, and from pyritic technogenic raw materials, containing 1.15 g/t, when holding them in peptone water and Leten medium reached 92.17% and 87.83%, respectively.

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Section: Discussionmentioning

confidence: 99%

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confidence: 99%

Bioleaching of Au-Containing Ore Slates and Pyrite Wastes

et al. 2019

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“…Moreover, S. thermotolerans and S. thermosulfidooxidans can utilize acetate and propionate that may be accumulated in the medium during the growth of the microbial community [44,45]. The addition of yeast extract to the medium promoted biooxidation due to the development of microorganisms of the genera Sulfobacillus and Ferroplasma strains [46,47].…”

Section: Yield Of Solidmentioning

confidence: 99%

Distinct Roles of Acidophiles in Complete Oxidation of High-Sulfur Ferric Leach Product of Zinc Sulfide Concentrate

Muravyov¹,

Panyushkina²

2020

Microorganisms

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A two-step process, which involved ferric leaching with biologically generated solution and subsequent biooxidation with the microbial community, has been previously proposed for the processing of low-grade zinc sulfide concentrates. In this study, we carried out the process of complete biological oxidation of the product of ferric leaching of the zinc concentrate, which contained 9% of sphalerite, 5% of chalcopyrite, and 29.7% of elemental sulfur. After 21 days of biooxidation at 40 °C, sphalerite and chalcopyrite oxidation reached 99 and 69%, respectively, while the level of elemental sulfur oxidation was 97%. The biooxidation residue could be considered a waste product that is inert under aerobic conditions. The results of this study showed that zinc sulfide concentrate processing using a two-step treatment is efficient and promising. The microbial community, which developed during biooxidation, was dominated by Acidithiobacillus caldus, Leptospirillum ferriphilum, Ferroplasma acidiphilum, Sulfobacillus thermotolerans, S. thermosulfidooxidans, and Cuniculiplasma sp. At the same time, F. acidiphilum and A. caldus played crucial roles in the oxidation of sulfide minerals and elemental sulfur, respectively. The addition of L. ferriphilum to A. caldus during biooxidation of the ferric leach product proved to inhibit elemental sulfur oxidation.

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“…During the biological step, when the biooxidation of the products from the first step occurs, an active oxidizer of sulfidic minerals is produced (ferric ions), most likely associated with the products of bacterial metabolism. The separation of the process into chemical and biological steps makes it possible to carry out each of the steps under optimal conditions (Fomchenko et al, 2010;Muravyov and Bulaev, 2013). For example, efficient sulfide oxidation with ferric iron requires high temperatures, whereas the optimal temperature for the biological step is determined by the microbial culture used and is usually below 50°C.…”

Section: Biooxidation Of Sulfidic Minerals and Sulfurmentioning

confidence: 99%