SEM analysis was carried out to complete the study of the phase change of compounds in the oxidation of mineral sulfides. Roasting of refractory gold ore with a …
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Strain selection for high temperature oxidation of mineral sulfides in reactors. In . Harnessing Biotechnology for the 21st Century: Proceedings of the Ninth International …
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The treatments studied for refractory minerals are roasting, bioxidation, chemical oxidation in acid or alkaline medium, and pressure oxidation. (3,8−10) When the mineral's refractoriness is due to the gold within …
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In this study, an alternative and highly efficient oxidative pretreatment for refractory gold ores and concentrates was developed using persulfate-based advanced oxidation process. This …
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In most refractory raw gold minerals, more than 90% of gold is distributed in sulfide, encapsulated or embedded in the crystal lattice of pyrite and/or arsenopyrite in the form of fine …
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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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The results show that gold extraction from the investigated refractory concentrate was linearly dependent on the sulfide oxidation: 97% sulfide oxidation resulting in 99% gold …
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Refractory gold ores are those that do not yield high gold recoveries in conventional cyanide-leaching circuits, even when the ore is finely ground. The cause of low gold recoveries can be …
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Some of refractory gold ores represent one of the difficult processable ores due to fine dissemination and interlocking of the gold grains with the associated sulphide minerals. …
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Minerals Engineering, Vol. 4, Nos 7-1 I, pp. 1029-1041, 1991 0892-6875/91 $3.00 + 000 Printed in Great Britain 1991 Pergamon Press plc PROCESSING OF REFRACTORY …
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Pressure oxidation (POX) remains a further option for the oxidation of refractory sulfides. Several projects have been recently constructed: the Killita Project in Finland, the Amursk Project in Russia, the Pueblo Viejo Project in …
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Nevertheless, the pressure oxidation of double refractory materials containing carbonaceous matter in addition to sulfides results in substantial gold losses due to autoclave …
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Pressure oxidation refers to the oxidation of sulfides, such as pyrite [FeS 2] ... Among several alternatives, bio-oxidation has emerge as a green technique that liberates gold …
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The oxidation degree of pyrite (and consequently the contribution to decrease the mineral refractory character) is surely higher than that calculated from the solubilized iron. This …
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With the evolving landscape of gold mineral resource development and utilization, the easily treatable gold resources are continuously decreasing, while refractory gold minerals …
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At Oxidation Technologies, we continuously explore innovative ozone applications to improve industrial processes. One groundbreaking advancement is the use of ozone treatment for refractory minerals, a technique …
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The advantage of chloride-bromide leaching is that the oxidation of refractory minerals can be conducted in atmospheric pressure. The kinetics of gold dissolution is fast, …
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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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Gold Extraction from a Refractory Sulfide Concentrate by Simultaneous Pressure Leaching/Oxidation ... Characterization of the ores showed that pyrite and quartz were the main minerals present in ...
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Fusion Techniques for the Oxidation of Refractory Actinide Oxides Tracy S. Rndisill and David G. Karraker March 1999 Westinghouse Savannah River Company ... actinide oxides with a series …
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Gold ores can be categorized into two types - free milling and refractory. Free milling ores are those easy to process by simple gravity techniques or direct cyanidation. ... The …
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Microwave energy was used to facilitate the breakdown of refractory mineral matrices to liberate gold before and during leaching experiments. ... The chemical response of the tailings to pre-treatment indicates that the species released …
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The raw materials used in this research were two different sulfide minerals—pyrite concentrate and sulfide gold concentrate—sourced from different companies in China. ...
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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 ...
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Minerals En&ineering, Vol. 7, Nos 2/3, pp. 239-249, 1994 0892--6875/94 $6.00+0.00 Printed in Great Britain 1993 Pergamon Press Ltd APPLICATION OF eMAX IMAGE …
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The refractory ore must be destroyed by chemical means using oxidative processes such as oxidation by roasting [4,5], bio-oxidation [6] [7][8][9], pressure oxidation [10,11], or ultrafine grinding ...
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An increase in the pressure oxidation temperature to 240°C leads to the oxidation of carbonaceous minerals, which makes it possible to process highly refractory concentrates (Guzman, Thorpe, and ...
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refractory gold ore", Minerals Engineering, Vo l. 20, pp. 1109-1119. Pals, ... An acid wash, also known as acidification, was carried out, followed by oxidation with nitric acid as a …
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Download scientific diagram | Process flow of bio-oxidation and biocyanidation of Au bearing refractory mineral ores. from publication: Bio-Oxidation and Biocyanidation of Refractory …
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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, finer fractions and eventually higher sulfide oxidation than that at 30°C. ... [18] J. A. Brierley, Response of microbial …
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