IMPROVING GOLD-BEARING SULFIDE ORE PROCESSING EFFICIENCY

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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Enhancement of low-grade scheelite ore processing efficiency

Journal of Mining Science ◽

10.1134/s1062739116010309 ◽

2016 ◽

Vol 52 (1) ◽

pp. 195-200 ◽

Cited By ~ 2

Author(s):

E. D. Shepeta ◽

L. A. Samatova ◽

I. V. Alushkin ◽

V. B. Shchipchin ◽

I. G. Korneev

Keyword(s):

Low Grade ◽

Processing Efficiency ◽

Ore Processing

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

MINING INFORMATIONAL AND ANALYTICAL BULLETIN ◽

10.25018/0236_1493_2021_31_0_127 ◽

2021 ◽

pp. 127-135

Author(s):

U.K. Sanakulov ◽

D. Yu. Tazhibaev ◽

U.A. Ergashev

Keyword(s):

Iron Recovery ◽

Sulfide Ore ◽

Acid Waste ◽

Gold Bearing

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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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Heap Biooxidation of Gold-Sulphide and Polymetallic Ores and Tailings

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.262.122 ◽

2017 ◽

Vol 262 ◽

pp. 122-125

Author(s):

Alexander V. Epiforov ◽

Aleksey N. Seleznev ◽

Yuriy Ye. Emelyanov ◽

Stanislav V. Balikov ◽

Lyudmila Ye. Shketova ◽

...

Keyword(s):

Precious Metals ◽

Base Metals ◽

Copper Ore ◽

Zinc Recovery ◽

Nickel Recovery ◽

Ore Processing ◽

Refractory Gold ◽

Processing Plants ◽

Refractory Ores ◽

Gold Bearing

Heap biooxidation is the most economic option of treating processing plants tailings and refractory ores containing non-ferrous and precious metals and sulphides.Pyrite tailings of copper ore processing (Sample 1), tailings of sulphide copper-nickel ore processing (Sample 2) and double refractory gold-bearing ore (Sample 3) were studied.Autotrophic microorganisms Acidithiobacillusthiooxidans and Acidithiobacillusferrooxidans were used for the tests. The duration of heap biooxidation tests for Samples 1, 2 and 3 was 6, 10 and 16 months, respectively. The rates of copper and zinc recovery into solution during heap biooxidation of Sample 1 were 68% and 71%, respectively; the rates of copper and nickel recovery from Sample 2 were 50% and 75%, respectively. Base metals were extracted from solution to selective high-grade concentrates after biooxidation.Biooxidation tailings of Samples 1 and 3 were leached using an alkaline sodium cyanide solution. The recovery of gold from Sample 1 and Sample 2 was 65% and 85%, respectively.

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