WU Tiantian, SHEN Zhihui, WANG Jianlong, et al. Recent advances for phase transformation and reconstruction of gold-bearing inclusions during the pre-oxidation of refractory gold ores[J]. Multipurpose Utilization of Mineral
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2023年2月1日 The ozonation of refractory minerals can improve gold extraction through direct treatment or indirect oxidation. It minimizes gold entrapping with refractory minerals by creating desired oxidizing conditions
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2022年1月23日 The refractory minerals with a high sulfide content require an oxidative pretreatment to increase the extraction of gold and silver in the cyanidation process [2, 5, 10].
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2024年1月10日 Refractory concentrates can first be pretreated using a wide range of methods, one of which is the biooxidation process. Acidophile oxidant microorganisms degrade the iron
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2024年1月1日 Pretreatment using microwave-assisted roasting with NaClO 3 as an additive to the oxidizing agent is a new method of processing refractory gold ore. Oxidation was studied
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2022年1月20日 Refractory gold ore is usually affected by the associated carbonaceous matter through the preg-robbing effect, which is eliminated by oxidation roasting, followed by leaching, to achieve a satisfactory gold
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2021年1月19日 Mechano-chemical activation of the refractory bio-oxidation product aided in overcoming the sulphate mineral-imposed refractoriness and improved gold recovery by about 1.8 times. Better monitoring of subtle
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2022年1月1日 The column bio-oxidation process of refractory gold ore was characterized by a variety of analytical methods, including X-ray diffraction, 16S rRNA gene analysis, scanning
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2022年1月10日 Pressure oxidation is a widely accepted method to treat refractory gold ores. Gold recovery is generally lower from alkaline than acidic pressure oxidation discharge due to
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Arsenopyrite (FeAsS) stands as one of the primary host minerals for refractory gold, where the gold is finely disseminated or chemically locked up within the matrix of these raw materials.
More2022年1月30日 ABSTRACT With the rising focus on the development of complex refractory ores, one of the major environmental challenges has been in the treatment and processing of arsenic-bearing minerals. An increasingly common approach is to immobilize arsenic as stable ferric arsenate phases during pressure oxidation, utilizing an existing process in the treatment
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1987年1月1日 Arsenopyrite and pyrite are the most common mineral carriers of refractory gold. Pressure oxidation of these refractory gold mineral carriers is a very complex reaction system involving several oxidation and hydrolytic reactions which occur in series and/or parallel. Moreover these oxidation reactions are highly exothermic.
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2018年5月1日 Column bio-oxidation of mineral with a particle size less than 10 mm at 60°C resulted in higher mineral decomposition, finer fractions and eventually higher sulfide oxidation than that at 30°C.
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Abstract Biomining through bioleaching and bio-oxidation aims at recovering desired metals at the required specifications with lower environmental impact and costs from ores and waste streams. Research and developments related to the process technology and efficient implementation of this approach are advanced worldwide. Small particles of gold, a metal of
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2021年1月19日 Refractory gypsum minerals in the bio-oxidised product became soluble following mechano-chemical activation. On the other hand, portions of rutile ... Mechano-chemical activation of the refractory bio-oxidation product aided in overcoming the sulphate mineral-imposed refractoriness and improved gold recovery by about 1.8 times.
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2013年1月1日 Refractory gold ores have poor gold recoveries with direct cyanide leaching. Typically the refractoriness is due to encapsulation of the gold particles inside the host mineral.
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2022年12月1日 The paper presents an overview of bio-oxidation of sulphidic refractory gold ores prior to gold cyanidation. This review discusses several factors, more importantly, oxygen requirements and oxygen ...
More2023年1月12日 Gold Extraction from a Refractory Sulfide Concentrate by ... Characterization of the ores showed that pyrite and quartz were the main minerals present in ... the oxidation of refractory minerals.
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2014年10月1日 Oxidation roasting, pressure oxidation, biological oxidation and chemical oxidation were usually used to pre-oxidize carbonaceous matter and sulfides in carbonaceous gold ores [7,11,[14] [15] [16].
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1994年6月1日 This paper reviews recent progress in the use of microorganisms tooxidize the sulfidic matrix in refractory gold ores (bio-oxidation) and to solubilize elemental gold (bioleaching). Arsenopyrite oxidation , Bioleaching , Biohydrometallurgy , Pyrite oxidation , Refractory gold ores , Thiobacillus ferrooxidans
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2015年5月15日 Bioleaching has emerged as a green technology with promising applications in mining industries in the context of recovery of precious metals from mineral ores. The authors synthesize the current knowledge available in the bioleaching of gold (Au) from ores by bringing together historical developments and recent endeavors. In addition, the role of the microbial
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2023年11月1日 Bio-oxidation of refractory sulfidic gold minerals has been applied at the commercial scale as a pre-treatment to improve gold yields and reduce chemical consumption during gold cyanidation.
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2018年5月1日 Column bio-oxidation of mineral with a particle size less than 10 mm at 60°C resulted in higher mineral decomposition, finer fractions and eventually higher sulfide oxidation than that at 30°C. Sulfide-S dissolution increased from 58% to 77% from 30°C to 60°C after 247 ds of bio-oxidation.
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Column bio-oxidation of mineral with a particle size less than 10 mm at 60°C resulted in higher mineral decomposition, ... [18] J. A. Brierley, Response of microbial systems to thermal stress in bio-oxidation heap pretreatment of refractory gold ores, Hydrometallurgy. 71 (2003) 13-19.
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2024年1月10日 The pretreatment of refractory gold ore includes roasting oxidation, bio-oxidation, chemical oxidation, and others [9 – 11]. The roasting oxidation is the traditional pretreatment method of the refractory gold ore and is the accomplished process, and the operation is simple, but the gold leaching rate is not high and the cost of waste gas treatment
More2022年11月1日 Refractory gold ore is usually affected by the associated carbonaceous matter through the preg-robbing effect, which is eliminated by oxidation roasting, followed by leaching, to achieve a ...
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2021年9月23日 Request PDF Bio-oxidation of Gold from Refractory Sulfide Ores: A Journey Ahead Biomining through bioleaching and bio-oxidation aims at recovering desired metals at the required specifications ...
More2020年4月28日 Microwave technology has been confirmed to be suitable for use in a wide range of mineral leaching processes. Compared to conventional leaching, microwave-assisted leaching has significant advantages. It is a proven process, because of its short processing time and reduced energy. The purpose of this study was to enhance the gold content in a refractory
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2022年1月1日 Bacterial oxidation was used to pre-treat a refractory gold sulfide concentrate obtained from the flotation of a gold ore from Madagascar. A mixed culture of Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans was used to oxidize the sulfides. The major form of sulfide was pyrite, which represented approximately 24.8% of the mineralogical composition of
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2024年6月27日 3.5 Effect of Oxidation Time on Oxidation of Sulfide Minerals. The effect of oxidation time on Sulfides was further investigated. The concentration of do was 25 mg/l at 10 μm P80. Samples were taken at 6H, 12H, 18H, 24H, 36H and 48 h after oxidation. The oxidation effect is shown in Fig. 169.5.
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