pretreatment of refractory gold ore

Pretreatment of a refractory arsenopyritic gold ore using ...
2015-3-1 · An arsenopyrite refractory ore was pretreated with NaOH to increase gold extraction. After pretreatment, gold and silver were leached with copper ammonium thiosulfate solution. Thiosulfate leaching of the as-received ore extracted only 21% and 29% of silver and gold, respectively. Up to 81% of the gold and 50% of the silver were recovered after ...
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Pretreatment Process on Refractory Gold Ores with As
Gold ores are considered refractory if gold extractions from a conventional cyanidation process are less than 80% even after fine grinding. 1) Arsenic-bearing refractory gold ore has stones extremely difficult to deal with. In the stones, gold is locked up in arsenic mineral matrix as the form of microscopic or submicroscopic lattice.
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Review Pretreatment Process on Refractory Gold Ores
mainly about the refractory gold leaching easily through arsenic removal to expose gold, changing the composition, physic-chemical and electro-chemical properties of the ore. Currently, there are four main methods of pretreatments of refractory gold ores with As. Pretreatment options for deal-ing with refractory gold ores are illustrated in Fig ...
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Sequential pretreatment of double refractory gold ore ...
2019-7-1 · Double refractory gold ore was sequentially pretreated to oxidize sulfides by thermophilic archaeon Acidianus brierleyi and then to decompose carbonaceous matters using the cell-free spent medium (CFSM) from white-rot fungus Phanerochaete chrysosporium.The pretreatment by A. brierleyi significantly improved the gold recovery from 25% to 77%. .
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Microwave pretreatment of a double refractory gold ore ...
2007-9-1 · A low-grade sample of a double refractory gold ore was obtained from Barrick Gold Strike. Two kilograms of the ore was mixed with 850 ml of tap water and ground for an hour in a mild steel rod mill with stainless steel rods (23 rods with a mass of 16.4 kg) to achieve 95% −75 μm (80% passing size, P 80 , 42 μm).
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Microbial pre-treatment of double refractory gold ores ...
A double refractory gold ore usually contains both sulfide minerals and carbonaceous matter and results in very low gold extraction. The micro-sized gold
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Microwave pretreatment of a double refractory gold ore
Double refractory gold ores, such as Barrick’s Goldstrike ore, contain both pyrite and carbonaceous matter and the latter results in the loss of
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Refractory Gold Ore Treatment Methods
2016-7-14 · Metallurgical ContentGold Leaching & Processing of Arsenic OreMispickel (Arsenopyrite: FeAsS).6Leaching and Recovering Gold from Antimony MineralsStibnite (Antimony Sulphide, Sb2S2)Telluride Gold Ore ProcessingSolubility of TelluridesGold Extraction from Carbonaceous OreList Gold Refractory Process Methods Where gold is associated with
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Recovery of gold from sulfide refractory gold ore ...
2021-4-1 · Typically, gold is encapsulated or finely disseminated in refractory gold ores and the direct cyanidation is not effective for gold extraction from these ores, even after the ore is ground to exceeding small particles (Nazari, 2017, Corrans and Angove, 1991).Especially for sulfide refractory gold ores, in order to recover gold, many oxidation pretreatment technologies were
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Improvement of Gold Leaching from a Refractory Gold ...
2017-7-31 · energy consumption. As a result, proper pretreatments are necessary to improve the leaching of gold from these refractory gold ores [5,6]. The pretreatment of oxidative roasting has always been one of the most extensively used methods in China attributing to its mature technique, high efﬁciency, energy conservation, etc. [7,8] Effective
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Pretreatment of Refractory Gold Ores Using Cell-Free ...
Request PDF | Pretreatment of Refractory Gold Ores Using Cell-Free Extracts of P. chrysosporium : A Preliminary Study | The fungus Phanerochaete chrysosporium has been proven to biotransform ...
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Aeration pretreatment of low grade refractory gold ores ...
1990-2-1 · Aeration curing, over a long duration in wetted stockpiles, shows promise as an affordable pretreatment method for oxidizing gold encapsulating sulfide minerals, and possibly organic matter, in low grade refractory ores. Following aeration pretreatment, the ore is reclaimed, neutralized, and cyanide leached by conventional practices. Large tonnages of subeconomic
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Microwave pretreatment of a double refractory gold ore
Double refractory gold ores, such as Barrick’s Goldstrike ore, contain both pyrite and carbonaceous matter and the latter results in the loss of
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(PDF) Mineralogy and Pretreatment of a Refractory Gold ...
2019-7-1 · refractory gold ore whether it was gravity separation alone or ﬂotation alone. Fine-grained gold in arsenopyrite is di ﬃ cult to dissociate, and the removal of arsenic during the ...
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Microwave pretreatment of a double refractory gold ore ...
2007-9-1 · Microwave pretreatment of a double refractory gold ore. B. Nanthakumar, C. Pickles, Ş. Kelebek. Abstract Double refractory gold ores, such as Barrick’s Goldstrike ore, contain both pyrite and carbonaceous matter and the latter results in the loss of gold from solution during cyanide leaching.
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Potential pre-treatment and processing routes for
2021-3-11 · 2.1 Microwave pre- treatment of refractory gold ores . Most of refractory gold occurs within sulphide minerals such as FeS 2 and FeAsS and are treated by roasting, pressure leaching or bacterial leaching to render the gold amenable to
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The Oxidation Pretreatment of a Sulfidic Refractory Gold ...
An attempt has been made to study the pretreatment of sulfidic refractory gold ore with pyrolusite. The inﬂuences of various parameters were studied to optimize the conditions.
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(PDF) A Preliminary Study on Nitric Acid Pre-treatment of ...
Direct cyanidation of both refractory silver ore and gold/silver concentrate resulted in low extractions of only ≤71% over 24 h. After nitric acid pretreatment, the extraction of
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Effect of Pretreatment of Sulfide Refractory Concentrate ...
2013-12-24 · gold in iron sulfide minerals such as pyrite and arsenopy- rite. Such deposits are called refractory gold ores due to the encapsulation of fine particles of gold in the ore host. A clear boundary between refractory and non-refractory ore in terms of gold recovery is not well defined, but several authors have pointed out that less than 60% gold
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Improvement of Gold Leaching from a Refractory Gold ...
2017-7-31 · energy consumption. As a result, proper pretreatments are necessary to improve the leaching of gold from these refractory gold ores [5,6]. The pretreatment of oxidative roasting has always been one of the most extensively used methods in China attributing to its mature technique, high efﬁciency, energy conservation, etc. [7,8] Effective
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Pretreatment Process on Refractory Gold Ores with As
1. Introduction. Gold ores are considered refractory if gold extractions from a conventional cyanidation process are less than 80% even after fine grinding. 1) Arsenic-bearing refractory gold ore has stones extremely difficult to deal with. In the stones, gold is locked up in arsenic mineral matrix as the form of microscopic or submicroscopic lattice.
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Sequential pretreatment of double refractory gold ore ...
Double refractory gold ore was sequentially pretreated to oxidize sulfides by thermophilic archaeon Acidianus brierleyi and then to decompose carbonaceous matters using the cell-free spent medium (CFSM)from white-rot fungus Phanerochaete chrysosporium. The pretreatment by A. brierleyi significantly improved the gold recovery from 25% to 77%.
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Mineralogy and Pretreatment of a Refractory Gold Deposit ...
2019-7-1 · The grade and recovery of gold in the flotation concentrates were 49.44 g/t and 33.36%, respectively. The total recovery of gold was 90.94%. The gravity–flotation combined beneficiation pretreatment process provided a feasible method for the refractory gold ore and ensured the effective recovery of gold.
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(PDF) Bacterial Leaching as a Pre-treatment Step for Gold ...
It is necessary to apply a pretreatment to obtain high gold recovery (>80%) from such refractory ores by cyanide leaching. There have been many studies on the oxidation of refractory gold ores for ...
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Alkaline sulfide pretreatment of an antimonial refractory ...
2010-11-16 · This paper presents the alkaline sulfide pretreatment of an antimonial refractory gold and silver ore. In the ore, gold occurs mainly as gold-silver alloys and as associated with quartz and framboidal pyrite grains, and, to a small extent, as the inclusions within antimonial sulfides. Silver is present extensively as antimonial sulfides such as andorite. Alkaline sulfide
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(PDF) The Application of Roasting Pretreatment for ...
Previous studies on an antimonial gold/silver ore from Akoluk, Turkey have indicated that the ore is refractory in character, presumably linked with the occurrence of the sulphides including ...
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Recovery Refractory Resources - SGS
refractory gold ore is gold-containing ore that is resistant to recovery by direct cyanidation and carbon adsorption processes. More specifically, it is an ore that has a gold recovery rate of less than 80% when direct cyanidation is applied to it. Dr Chris Fleming, senior metallurgical consultant at SGS Minerals, says: “In the
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Process for treating refractory gold ores by roasting ...
2000-2-1 · Microscopic gold inclusions in sulfide minerals cannot typically be extracted by conventional cyanidation. The gold ore must be pretreated to oxidize sulfide minerals associated with gold and to remove other minerals and chemical compounds that interfere in the cyanidation leaching process. The recovery of gold from refractory sulfidic-carbonaceous ores after
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Improvement of Gold Leaching from a Refractory Gold ...
2017-7-31 · energy consumption. As a result, proper pretreatments are necessary to improve the leaching of gold from these refractory gold ores [5,6]. The pretreatment of oxidative roasting has always been one of the most extensively used methods in China attributing to its mature technique, high efﬁciency, energy conservation, etc. [7,8] Effective
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Recovery of gold from refractory gold ores: Effect of ...
2021-4-5 · The extraction of gold from refractory gold ores (RGOs) without side reactions is an extremely promising endeavor. However, most RGOs contain large amounts of sulfide, such as pyrite. Thus, investigation of the influence of sulfide on the gold leaching process is important to maximize the utilization of RGOs. In this work, the effects of pyrite on the stability of the
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