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The depletion of readily amenable gold ores and discovery of complex deposits inspire knowledge improvement and search of commercially effective technique in extracting gold from refractory gold ores.
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A number of papers and several books have been published on the mineralogy of gold in ores [4]. A potential problem is also afforded by the very fine-grained nature of some of the arsenical pyrite and arsenopyrite which are intimately …
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The pretreatment of refractory gold ore is a complex chemical process. In addition to the oxidation of pyrite, some side reactions also occur. The phase changes of refractory gold ore before and after pretreatment are shown in Fig. 11. The main phases of refractory gold ore include quartz (SiO 2), pyrite (FeS 2), and dolomite (CaMg(CO 3) 2 ...
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2011. The pretreatment of an antimonial refractory gold and silver ore was investigated using alkaline sulphide leaching. The ore assayed 20 g/t Au and 220 g/t Ag and contained predominantly quartz/clay and barite, and to a lesser extent, sulphides such as pyrite, stibnite, sphalerite, zinkenite (Pb 9 Sb 22 S 42 ) and andorite (Sb 3 PbAgS 6 ).
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Therefore, pretreatment of arsenic-bearing refractory gold has an extremely important significance. 3) In recent years, researches are mainly about the refractory gold leaching easily through arsenic removal to expose gold, …
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2011. The pretreatment of an antimonial refractory gold and silver ore was investigated using alkaline sulphide leaching. The ore assayed 20 g/t Au and 220 g/t Ag and contained predominantly quartz/clay and barite, and to a lesser extent, sulphides such as pyrite, stibnite, sphalerite, zinkenite (Pb 9 Sb 22 S 42 ) and andorite (Sb 3 PbAgS 6 ).
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A pretreatment to remove and recover base metals present in complex sulfide refractory ores is proposed as a method to improve the extraction of precious metals with thiourea.
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In this study, a new method to improve gold extraction from sulfide bearing gold ores is proposed based on the model experiments using a mixture of gold powder and arsenopyrite-bearing sulfide (HAsBS) ore.
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Research is ongoing for pre-treatment methods that can be applied to aid gold recovery by cyanidation. Roasting, pressure oxidation (acidic and alkaline), biological oxidation, …
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The invention relates to a treatment method of microwave heating gold ore and gold concentrate, which is used for the pretreatment of gold ore and gold concentrate containing high...
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3.1 Pretreatment by sulfuric acid curing 3.1.1 Effect of temperature. Weight loss rate and iron removal rate of ore samples at different reaction temperatures are shown in Fig. 1.The reaction time was set to 3 h, the liquid–solid ratio was 3:1, and the mechanical stirring speed during leaching was 400 r/min for adequate mass and heat transfer.
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Gold ores are considered refractory if gold extractions from a conventional cyanidation process are less than 80% even after fine grinding [ 1 ]. These low extractions do not normally allow economic recovery of the metal [2][3][4][5][6]. These resources can consist of ores, flotation concentrates, mill railings and other reserves.
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DOI: 10.1016/J.HYDROMET.2010.10.005 Corpus ID: 95526481; Improved gold and silver extraction from a refractory antimony ore by pretreatment with alkaline sulphide leach @article{Celep2011ImprovedGA, title={Improved gold and silver extraction from a refractory antimony ore by pretreatment with alkaline sulphide leach}, author={Oktay Celep and İbrahim …
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KEYWORDS: refractory gold ore, oxidation, gold extraction, calcium hypochlorite, pretreatment 1. INTRODUCTION Gold extraction continues to be a primary activity in the mining-metallurgy industry. According to the 2024 Annual Report of Mexico's Mining Chamber,1 Mexico obtained ninth place in gold production worldwide with a participation
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ALTA 2012 INTERNATIONAL GOLD CONFERENCE Annual gathering of the global Gold Ore Processing Industry May 31-June 1 2012, Burswood Convention Centre, Perth, Western Australia Table 8: Summary Comparison of selected Refractory Gold processes for Ore B Summary Comparison of Refractory Gold Processes for Ore B OPTION PROCESS 1 2 3 Air Roasting ...
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Due to the depletion of high-grade gold ores with large-scale gold ore mining, the attention of gold production enterprises is switching towards refractory gold ores gradually (Karamanev et al., 2001; Zhu et al., 2012). There are two reasons for refractory of gold: (a) The content of organic carbon in the ores is higher
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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 electron microscope ...
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Keywords: refractory gold ore, oxidative pre–treatment, non ... 2012), mainly due to the failure of cyanidation for extracting gold from the refractory ores, long leaching times (more than 24 ...
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Recovering gold from sulfide refractory gold ore has been an important guarantee for the sustainable development of gold industry, while there are many challenges in the …
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Conventional leaching, the standard method for gold extraction, involves using a cyanide solution to dissolve gold from the ore. However, this process is often ineffective for refractory ores due to the presence of sulfide …
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A number of papers and several books have been published on the mineralogy of gold in ores [4].A potential problem is also afforded by the very fine-grained nature of some of the arsenical pyrite and arsenopyrite which are intimately intergrown with silicate gangue minerals (see Fig. 1).Adequate recovery of these fine-grained components might be difficult to achieve, …
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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 either ... To render gold 'locked' in the sulphide mineral amenable to cyanidation a chemical pre-treatment is required. No matter what process option is ...
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The later development of flotation for gold ores, has, in most cases, provided a satisfactory pretreatment and has been applied in several ways. Flotation removes most of the freed carbon with the concentrate, which is then …
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Some ores contain "invisible gold" that is either present as extremely fine particles (less than 5 µm) or is actually incorporated into the structure of minerals such as arsenopyrite. Very fine grinding usually has limited effect on this type of refractory ore. Other refractory ores contain naturally occurring active carbon.
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Our third method for refractory ore pre-treatment involves oxidation within an autoclave at elevated temperatures and pressures. This is referred to as pressure oxidation (POX). Gold laden ore is pulverized to a similar consistency as found with bio-oxidation processes (~75μm). The slurry is pumped through thickeners to remove water prior to
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Mineral Processing and Extractive Metallurgy, 2012. Using iron and sulphur oxidising bacteria to catalyse the breakdown of sulphides that host the gold is an important biological method for the pretreatment of refractory gold ores. Following this biological treatment, a combination of chemical and physical methods is used for leaching (such as ...
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In order to maintain the sustainable use of gold resources, effective pre- treatment and processing of complex gold ores is urgently required. This project aims to review on the techniques currently being employed in order to determine research gaps for sustainable processing of refractory gold ores. 2. Pre-treatment of Refractory Gold Ores
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Carbonaceous sulfidic gold ores are commonly double refractory and thus require pretreatment before gold extraction. In this paper, the capacity of pre-bio-oxidation can simultaneously decompose sulfides or deactivate carbonaceous matters (CM) from a double refractory gold ore (DRGO) using pure cultures of A. ferrooxidans or L. ferrooxidans, and a mixed culture …
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The problem of refractory sulfide gold ore that has a gold recovery less than 50% when direct cyanidation applied, still exists until now. It needs oxidative pretreatment for cyanidation to be ...
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The mechanism of ultrasound oxidation effect on the pyrite for ... ... [article]
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