Iron recovery from acid waste solutions after bio-oxidation of gold-bearing sulfide ore concentrates

Microbial population performing biooxidation of flotation concentrate of gold bearing sulfide ore containing pyrite, arsenopyrite, and pyrrhotite was studied using cultural and molecular biological (metagenomics sequencing of V3-V4 fragments of 16S rRNA gene) approaches. The biooxidation of the concentrate was conducted at temperatures from 38 to 42°C. Strains of Acidithiobacillus thiooxidans, Acidiphilium multivorum, Leptospirillum ferriphilum, Sulfobacillus thermotolerans, Ferroplasma acidarmanus, and Ferroplasma acidiphilum were isolated from the samples of the pulp from biooxidation reactors. It was shown that optimum temperatures of isolated strains were from 38 to 40°C. Metagenomic analysis demonstrated predominance of the genera Acidiferrobacter, Acidithiobacillus, Acidiphilum, Leptospirillum, and Ferroplasma. According to results of molecular biological analysis, share of the genus Acidithiobacillus was of 0 to 25%, share of the genus Acidiferrobacter was of 7 to 56%, share of the genus Acidiphilum was of 0.03 to 36%, share of the genus Leptospirillum was of 0.7 to 7%, whereas share of the archaea of the genus Ferroplasma was of 33 to 94%. Thus, it was shown that representatives of the genus Ferroplasma can play significant role in bioleach process. Representatives of the genus Acidiferrobacter were previously detected in acid mine drainages, acid soils as well as in bioleach heaps and reactors, whereas data on predominance of the genus in tank bioleach processes have not been presented in the literature. In the present study, strains of the genus Acidiferrobacter were not isolated despite application of the nutrient media recommended for Acidiferrobacter and their properties were not studied. Nevertheless, results of the present study suggest that representatives of the genus Acidiferrobacter have a great impact on industrial bioleach processes.

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OBTAINING SOME THERMOD AINING SOME THERMODYNAMIC PARAMETERS CONTAINING ME AINING METACRYLATE AND ALL TE AND ALLYL GROUPS CON YL GROUPS CONTAINING IN COMPOSITION

Technical science and innovation ◽

10.51346/tstu-01.18.2.-77-0012 ◽

2019 ◽

Vol 2019 (1) ◽

pp. 69-75

Author(s):

Kh Akhmedov ◽

Zh Bekpulatov ◽

G Solijonova ◽

N Sharifova

Keyword(s):

Sulfuric Acid ◽

Acid Treatment ◽

Noble Metals ◽

Material Composition ◽

Rational Analysis ◽

Sulfuric Acid Treatment ◽

Chemical Assay ◽

Sulfide Ore ◽

Content Of Gold ◽

Gold Bearing

The article discusses the results of studying the material composition and the development of technology for processing gold-bearing sulfide ore samples. The material composition of the ore samples was studied by spectral, chemical, assay and rational analysis of gold and silver. Based on a study of the material composition of the ore samples, the following conclusions were made: gold and silver are the industry's most valuable components. It is shown that the use of sulfuric acid treatment of a cinder of graviofloraf concentrate can allow to improve the technological performance of the process. As a result of the mixture of gravio-flotation concentrate after sulfuric acid treatment drying, grinding to a size of 95% CL. -0,074+0 mm and subjected to sorption cyanidation. In the initial cake, the content of gold -77.83 u. e. and silver-16.3 u. e., the concentration of sodium cyanide 0.15%, the ratio W:t=2:1; resin AM-2B-5% of the pulp volume, the duration of cyanidation 36 hours.the Content in the tailings of cyanidation of gold - 6.5 u. e., and silver - 4.8 u. e. the Extraction of noble metals in solution and on the resin was 91.65 and 70.55%, respectively. Through extraction of 87.63% gold and 55.6% silver from ore.

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Understanding Stress Response to High-Arsenic Gold-Bearing Sulfide Concentrate in Extremely Metal-Resistant Acidophile Sulfobacillus thermotolerans

Microorganisms ◽

10.3390/microorganisms8071076 ◽

2020 ◽

Vol 8 (7) ◽

pp. 1076 ◽

Cited By ~ 1

Author(s):

Anna Panyushkina ◽

Daria Matyushkina ◽

Olga Pobeguts

Keyword(s):

Stress Response ◽

Microbial Communities ◽

Molecular Mechanisms ◽

Raw Materials ◽

Metal Resistance ◽

Sulfide Ore ◽

Microbial Responses ◽

Sulfide Concentrate ◽

High Arsenic ◽

Gold Bearing

Biooxidation of gold-bearing arsenopyrite concentrates, using acidophilic microbial communities, is among the largest commercial biohydrometallurgical processes. However, molecular mechanisms of microbial responses to sulfide raw materials have not been widely studied. The goal of this research was to gain insight into the defense strategies of the acidophilic bacterium Sulfobacillus thermotolerans, which dominates microbial communities functioning in industrial biooxidation processes at >35 °C, against the toxic effect of the high-arsenic gold-bearing sulfide concentrate. In addition to extreme metal resistance, this acidophile proved to be one of the most As-tolerant microorganisms. Comparative proteomic analysis indicated that 30 out of 33 differentially expressed proteins were upregulated in response to the ore concentrate, while the synthesis level of the functional proteins required for cell survival was not negatively affected. Despite a high level of cellular metal(loid) accumulation, no specific metal(loid)-resistant systems were regulated. Instead, several proteins involved in the metabolic pathways and stress response, including MBL fold metallo-hydrolase, sulfide:quinone oxidoreductase, and GroEL chaperonin, may play crucial roles in resistance to the sulfide ore concentrate and arsenic, in particular. This study provides the first data on the microbial responses to sulfide ore concentrates and advances our understanding of defense mechanisms against toxic compounds in acidophiles.

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Improvement of flotation technologies for finely dispersed gold-bearing sulfide ore

MINING INFORMATIONAL AND ANALYTICAL BULLETIN ◽

10.25018/0236-1493-2018-10-0-180-190 ◽

2018 ◽

Vol 10 ◽

pp. 180-190

Author(s):

B.V. Komogortsev ◽

◽

A.A. Varenichev ◽

Keyword(s):

Sulfide Ore ◽

Dispersed Gold ◽

Gold Bearing

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Application of a nanosecond corona discharge generator for electrical separation of ores

Journal of Physics Conference Series ◽

10.1088/1742-6596/2064/1/012089 ◽

2021 ◽

Vol 2064 (1) ◽

pp. 012089

Author(s):

S R Korzhenevskiy ◽

A A Komarskiy ◽

A V Ponomarev ◽

A S Chepusov ◽

O D Krasniy

Keyword(s):

Corona Discharge ◽

Discharge Current ◽

Titanium Content ◽

Interelectrode Distance ◽

Voltage Source ◽

Gold Content ◽

Sulfide Ore ◽

Discharge Generator ◽

Gold Bearing

Abstract The use of a pulsed nanosecond voltage source in a corona separator was investigated. Measurements of the distribution of corona discharge current were obtained. The influence of the interelectrode distance on the distribution of the corona discharge current was investigated. Experiments with gold-bearing quartz-sulfide ore and ilmenite ore were carried out. A concentrate was obtained with a gold content of 48 g/t, a mass equal to 18.7% of the original, which corresponds to the extraction of 92% of gold. The titanium content of ilmenite was enriched from 2.87% to 18.1%.

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Thermodynamic Modelling of Geo-Biometallurgical Oxidation of Sulfide Ores

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1130.50 ◽

2015 ◽

Vol 1130 ◽

pp. 50-54

Author(s):

Sergey S. Gudkov ◽

Yuri Ye. Yemelianov ◽

Luidmila Ye. Shketova ◽

Natalia V. Kopylova ◽

Tatiana Yu. Afonina

Keyword(s):

Solid Phase ◽

Reaction Pathway ◽

Sulfide Oxidation ◽

Metastable Equilibrium ◽

Sulfide Ores ◽

Bacterial Oxidation ◽

Sulfide Ore ◽

Sulfides Oxidation ◽

Alkaline Conditions ◽

Gold Bearing

Heap bioleaching of sulfide ores (geotechnology) simulates naturally occurring processes when sulfides convert to oxides. This process is environmentally-friendly. Gold-bearing sulfide ore from a Russian deposit was studied. The samples were composed of quartz (38-48%), feldspars (22-24%) and micaceous minerals (18-21%). Carbonates occurred as ankerite, calcite, dolomite and siderite. The host minerals were pyrite (2.2-2.3%) and arsenopyrite (1.2-1/7%). The grade of gold was 1.6-2.0 g/t. Russian software package Selector was used to develop the model. Thermodynamics of the reaction pathway for the conversion of the gold-bearing sulfide ore in H2SO4 environment with and without using bacteria was calculated. Phases and their components which are able to form in these given conditions were selected during modeling. Modeling of irreversible evolution of the rocks caused by bacteria was carried out in the three reservoir system. They are interconnected by the flows of three movable phases: gases, solid phase and liquid phase. In this case, the composition of the solutions which were obtained under steady state conditions without bacteria and metastable equilibrium using bacteria can be compared. Bacterial oxidation occurs under acidic conditions. Oxidation without using bacteria occurs under more alkaline conditions. Bacteria increase the rate of sulfides oxidation and retard the formation of mixed-layer aluminum silicates (illites, montmorillomonites) and carbonates (magnesian calcite). It was found that bacteria have the potential to achieve the required destruction of sulfides in favorable environment. Bacteria make the rate of sulfide oxidation higher. In the presence of bacteria, the rate of aluminosilicates oxidation is slower compared to the conditions without using bacteria. Mineralogical analyses of the leach products confirmed this. Results show that thermodynamic approach can be successfully used for the modeling of bacterial-oxidation circuits and geology of the rocks and ores.

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IMPROVING GOLD-BEARING SULFIDE ORE PROCESSING EFFICIENCY

Proceedings of Irkutsk State Technical University ◽

10.21285/1814-3520-2017-12-195-202 ◽

2017 ◽

Vol 21 (12) ◽

pp. 195-202

Author(s):

Alena Bogudlova ◽

◽

Grigory Voiloshnikov ◽

Tamara Matveeva ◽

◽

...

Keyword(s):

Processing Efficiency ◽

Ore Processing ◽

Sulfide Ore ◽

Gold Bearing

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Iron Recovery by Two-Stage Roasting the Gold-Bearing Pyrite Concentrate and Gold-Leaching from the Pyrite Cinder by Thiourea

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.962-965.784 ◽

2014 ◽

Vol 962-965 ◽

pp. 784-788

Author(s):

Gui Chun He ◽

Yi Peng Wu ◽

Jin Ni Feng

Keyword(s):

Low Grade ◽

Leaching Rate ◽

Iron Recovery ◽

Pyrite Cinder ◽

Two Stage ◽

Gold Leaching ◽

Waste Products ◽

Manufacturing Plants ◽

Pyrite Concentrate ◽

Gold Bearing

Pyrite cinders, which are the waste products of sulphuric acid manufacturing plants, contain hazardous but valuable heavy metals. This passage introduced that iron recovery by two-stage roasting the pyrite concentrate and gold-leaching from the pyrite cinder by thiourea. After re-floating and two-stage roasting of the gold-bearing low-grade pyrite concentrate, the final cinder contains about 0.056% As and 61% Fe and high grade gold and silver. The thiourea gold-leaching experiment for the pyrite cinder shows the gold-leaching rate is up to 90.4% in the case of grinding fineness of 60%-0.074mm, pH = 1~2, R=1:2, thiourea dosage of 10g / L, ferric sulfate dosage of 3g / L, leaching time of 6h.

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