• Heap bioleaching of low grade refractory sulphide ores at elevated pH which reduces cost of neutralization ahead of cyanidation (BioHeap/Western Areas, Australia, paper at ALTA 2013 …
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DOI: 10.1016/J.MINENG.2021.106822 Corpus ID: 233530449; Recovery of gold from sulfide refractory gold ore: Oxidation roasting pretreatment and gold extraction @article{Qin2021RecoveryOG, title={Recovery of gold from sulfide refractory gold ore: Oxidation roasting pretreatment and gold extraction}, author={Hong Qin and Xueyi Guo and Qinghua …
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At present, more than 35% of China's gold resources (with a total amount of more than 1,000 tons) are difficult to be exploited and smelted, and about 700 tons of gold ores with high arsenic, antimony or sulfur are difficult to be directly cyanide leached (Lei et al., 2016).However, as the gradual depletion of easy-to-treat gold ore reserves, the complex …
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The term 'refractory gold ores' refers to gold ores characterised by a low extraction yield through cyanidation. Therefore, to improve the gold leaching efficiency, pretreatment techniques are necessary to overcome the refractoriness behaviour. This paper reviews various technologies applied to enhance gold recovery from refractory ores ...
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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, …
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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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Cyanide-refractory ores constitute 30 % of the world's gold mineral resource base. With the global decrease in the availability of high-grade and free-milling ores, low-quality ores, including ...
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Improved gold and silver extraction from a refractory antimony ore by pretreatment with alkaline sulphide leach Oktay Celep, İbrahim Alp⁎, Hacı Deveci Department of Mining Engineering ...
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In sulphidic refractory gold ores, fine gold particles may be highly disseminated and locked up in sulphide minerals such as pyrite and arsenopyrite [1]. All largely unoxidised ores exhibit very low gold recoveries (typically <20%) by direct cyanidation.
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The paper discusses the gold treatment methods on free milling ores with conventional cyanidation and refractory ores with direct and pretreatment techniques for the recovery of high gold values.
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This paper presents the results obtained by processing a gold and silver telluride mineral concentrate from a mine in Colombia. An acid wash, also known as acidification, was carried out, followed by oxidation with nitric acid as a pretreatment. Cyanidations of the pretreatment residues were carried out and the results were compared with results from cyanidations of base …
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[2] NANTHAKUMAR B, PICKLES C A, KELEBEK S. Microwave pretreatment of a double refractory gold ore [J]. Minerals Engineering, 2007, 20(11): 1109âˆ'1119. [3] CELEPA O, ALPA Ä°, PAKTUNCB D, THIBAULT Y. Implementation of sodium hydroxide pretreatment for refractory antimonial gold and silver ores [J].
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Pyritic ores are free-milling to mildly refractory, or rarely moderately refractory. Pyrite in pyritic ores contains negligible to low levels of submicroscopic gold (<5 ppm). Other reasons for refractory behaviour in pyritic ores include very fine-grained native gold inclusions in pyrite, or the presence of gold-bearing tellurides.
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Pretreatment and processing of refractory gold ore are becoming increasingly important and an inevitable trend for gold development due to the depletion of high-grade ores (Mabwe, 2020). Extraction of gold from refractory gold ore without any side reactions is a highly desirable process in the future ( Qin, Guo, Tian, & Zhang, 2021 ).
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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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DOI: 10.1016/J.HYDROMET.2014.03.007 Corpus ID: 93717030; Influence of potassium hydroxide pretreatment on the extraction of gold and silver from a refractory ore @article{Alp2014InfluenceOP, title={Influence of potassium hydroxide pretreatment on the extraction of gold and silver from a refractory ore}, author={İbrahim Alp and Oktay Celep and …
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Base metal citrate pretreatment of complex ores to improve gold and silver leaching with thiourea. ... Hydromet., 115-116 (2012), pp. 30-51. View PDF View article View in Scopus Google Scholar. Teutli et al., 1990. ... Extraction of gold from refractory gold ore using bromate and ferric chloride solution. Min. Eng., 136 (2019), ...
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Gold, a significant precious metal, has high corrosion resistance, excellent electrical and thermal conductivity [].In the field of gold extraction and smelting, refractory gold ore is one of the most important gold resources at present [].Approximately 30% of the world's gold production is derived from refractory gold ore, and this proportion is expected to increase even …
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One of the successful and excellent examples of the installation of heap biooxidation for the pretreatment of refractory gold ores was applied to the Agnes Gold Mine, ... Pradhan JK, Kumar S (2012) Metals bioleaching from electronic waste by Chromobacterium violaceum and Pseudomonads Sp. Waste Manag Res 30:1151–1159.
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The use of thiosulfate to extract gold from refractory ores is promising because of its non-toxicity and high selectivity. Sulfide minerals (i.e., pyrite, arsenopyrite, chalcopyrite), major gold carriers in refractory gold ores, however, hinder gold extraction due to the high consumption of a lixiviant. In this study, a new method to improve gold extraction from sulfide bearing gold …
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Refractory gold ores and concentrates are characterised by low gold recoveries and high cyanide consumptions when subjected to direct cyanide leaching. Therefore an oxidation pretreatment step is required before cyanidation that will break up the sulphide lattice and render gold particles accessible to cyanide ions. The main three options for ...
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Demonstration of economic treatment options allows gold companies to maintain and increase their ore reserves. The selection of …
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Potassium hydroxide alkaline pretreatment of a refractory gold-silver ore containing 20 g/t Au and 220 g/t Ag was investigated with the purpose to evaluate its effectiveness on the extraction of gold and silver. ... Zárate-Gutiérrez R, Lapidus GT, Morales RD (2012) Aqueous oxidation of galena and pyrite with nitric acid at moderate ...
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With the rapid depletion of easily treatable gold deposits, numerous research efforts have been undertaken to develop technologies for the utilization of refractory gold ores (Wang et al., 2019). Currently, refractory gold ores account for approximately one-third of the total gold production from natural ores (Qin et al., 2021).
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The goal of this research was to compare the refractory behavior of a gold concentrate treated using two pretreatment methods: pressure oxidation and fine grinding. …
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In our previous studies, the introduction of ultrasound in alkaline solution during the pretreatment stage of gold ore significantly increases the leaching rate of gold from refractory ore (Zhang et al., 2016). Though the application of ultrasound rises great attention in recent year, but few researches are focus on the mechanism of ultrasound ...
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Selective alkaline leaching of antimony from Low-grade refractory gold ores and process optimization ... that the alkaline leaching process of pyroxene is mainly influenced by the contraction nucleation model (Pavel et al., 2012; Sajjad et al., 2021), but having great differences among different ores, which can be manifested in the apparent ...
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Request PDF | On Mar 31, 2015, Sandra L. Mesa Espitia and others published Pretreatment of a refractory arsenopyritic gold ore using hydroxyl ion | Find, read and cite all the research you need on ...
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According to a recent article by global consulting firm McKinsey, approximately one-quarter of the gold in geological reserves and resources can be considered refractory, with gold production from refractory ores expected to grow 1.4 % in the next four years, versus 0.3 % for non-refractory ores.
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