Recovery of gold from sulfide refractory gold ore:
This research focused on procedures for recovering gold from sulfide refractory gold ore in a clean and efficient way through a sequential separation method. This review presents an updated data on various technologies for the processing of refractory gold-bearing sulfide concentrates. It primarily focuses on the hydrometallurgical treatment forRelationship of gold recovery to sulfide oxidation
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(PDF) Gold Extraction from a Refractory Sulfide
Most gold deposits occur associated with sulphides like pyrite and arsenopyrite; thus, precious metal dissolution is possible by oxidizing auriferous sulfide concentrate using simultaneous...Cyanidation is the most prevalent method of extracting gold from ore. It is carried out by forming a soluble gold cyanide complex that can be concentrated and recovered, via the Gold Extraction from Refractory Sulfide Gold Concentrates: A
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Improving gold recovery from refractory gold ores
1. Introduction Cyanidation is the most common method for gold extraction from its ore or concentrate. However, direct cyanidation is only effective for treating non Results show that bio-oxidation pretreatment can greatly improve the gold recovery rate of high-sulfur refractory gold concentrate, and at the optimum pH 1.3 in Well-controlled stirring tank leaching to improve bio
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Kibali Gold Mine sulphide concentrate treatment
ABSTRACT. Kibali Gold Mine (KGM) processing plant treats both free milling and partially refractory ores. The flotation concentrate, is subjected to ultrafine grinding in 8 parallel Sulfide oxidation and gold leaching used for a refractory sulfide concentrate. Leaching tests at different concentrations of Ca (OCl) 2 and NaCl were Simultaneous sulfide oxidation and gold leaching of a
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Recovery of Gold from the Refractory Gold
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 Flotation concentrate is sulfide gold-copper-arsenic product, and the valuable components are copper and gold “Study of sulfiding roasting for removing arsenic from scorodite during treatment of rebellious gold-containing ores,” Tsvet. Met., No. 8, 36–40 (2015). I. R. Boboev, Sh.Development of a Production Scheme for Processing Rebellious Gold
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Recovery of gold from sulfide refractory gold ore: Oxidation
Sulfide gold ores account for a large proportion of refractory gold ores, therefore, it is very meaningful to recover gold from sulfide gold ores (Ubaldini and Vegliò, 2000, Saba, 2011, Hammerschmidt, 2016). Moreover, the major gold leaching process for extracting gold from ores and concentrates is still cyanide leaching.This work summarizes the results obtained regarding the use of ozone in the oxidation of sulfide ores containing gold, silver, and copper. Results show that the extraction of gold and silver is increased by at least 15%, with lower cyanide consumption; the extraction of copper increased by 16% and in less time; and in the case of coal, sulfur Treatment of Sulfide Minerals by Oxidative Leaching with Ozone
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Recovery of Gold from the Refractory Gold Concentrate Using Microwave
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 The double refractory gold concentrate was a typical refractory gold concentrate containing 38.7 g/t gold, 42.6 g/t silver, 22.5% iron, 6.1% arsenic, During POX treatment (P1 and P2), 98% sulfide oxidation was achieved both Test P1 and P2 for arsenopyrite and pyrite.Simultaneous sulfide oxidation and gold dissolution by
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Study on Pre-removal Antimony from Antimony–Gold Concentrate
Antimony–gold concentrate is a refractory gold ore, and the direct cyanide leaching efficiency is very low [].For antimony–gold concentrate with high antimony content (Sb > 30%), the volatilization melting of blast furnace and reduction melting of reverberation furnace is generally adopted at present, and the gold is finally enriched in noble Abstract This review provides an update to the last mini-review with the same title pertaining to recent developments in bioleaching and biooxidation published in 2013 (Brierley and Brierley). In the intervening almost 10 years, microbial processes for sulfide minerals have seen increased acceptance and ongoing but also declining Progress in bioleaching: part B, applications of microbial processes
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Biohydrometallurgical treatment of old flotation tailings of sulfide
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% Metals 2020, 10, 897 5 of 11 5. Gold Cyanidation in Copper Flotation Tailings The production of copper concentrates from copper-gold sulfide minerals by froth flotationA Review of the Cyanidation Treatment of Copper- Gold Ores and Concentrates
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A Review of the Cyanidation Treatment of Copper
The production of copper concentrates from copper-gold sulfide minerals by froth flotation generally results in tailings with copper, silver, and gold values. The cyanidation of copper flotation tailings Ammonium thiosulfate is an alternative lixiviant for the hydrometallurgical treatment of sulfide gold ores. The present study is primarily focused on ammonium thiosulfate leaching of gold (Au) and silver (Ag) from the sulfide ore (Sunshin mine in Korea). The main chemical composition of the concentrate was Au (84 ppm), Ag (852 Leaching Behavior of Gold and Silver from Concentrated Sulfide
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The BIOX™ Process for the Treatment of Refractory Gold Concentrates
Bio-oxidation of sulfide minerals, components of gold-bearing concentrates (arsenopyrite, pyrite), may be described by the following simplified overall reactions [6]: 2FeAsS + 7O 2 +H 2 SO 4 + 2HThe goal of the present work was to evaluate the possibility of improving the efficiency of the stirred tank reactor biooxidation of sulfide gold-bearing concentrate by means of addition of carbon sources required for the constructive metabolism of microorganisms. Biooxidation experiments were performed on gold-bearing pyrite Carbon Sources as a Factor Determining the Activity of Microbial
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Biooxidation-thiosulfate leaching of refractory gold concentrate
The gold-bearing sample was identified as a high-sulfur fine-sized wrapped-type refractory gold concentrate. The gold leaching efficiency obtained by direct cyanidation was only 59.86%. After biooxidation pretreatment, the sulfide minerals were almost completely decomposed, 92wt% of the mineral particles of the biooxidation The efficiency of biooxidation for treatment of a double-refractory gold-bearing sulfide ore concentrate from the Bakyrchik deposit (East Kazakhstan) was defined. The experiments were conducted in two different modes, i.e., with the standard liquid medium and the medium imitating the chemical composition of the Bakyrchik Biooxidation of a double-refractory gold-bearing sulfide ore concentrate
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Biooxidation of Gold Ores in Russia and Kazakhstan
Despite these deficiencies, the extent of oxidation for the sulfide flotation concentrates reached 88% and 92% of the gold present in the concentrate was recovered. The slurry solid content was (in 2021) 182 g L −1 (16.11%), the process time for the entire reactor chain was 110 h, and the feedstock supply speed was up to 5.0 m 3 h −1 .The roasting of a refractory gold concentrate using microwave radiation has been investigated. The TGA results in air show that there was a continuous mass loss from room temperature to 1000 °C with a total mass loss of 23%. The major mass loss of over 10% occurred between 400 °C and 600 °C and this was attributed to the oxidation Microwave roasting of a carbonaceous sulphidic gold concentrate
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Biological pretreatment of carbonaceous matter in double refractory
Two-stage bio-oxidation was applied to treat double refractory gold concentrates, which contain 65.30 g/t Au, 6.10% C and 11.90% S, and the main sulfide minerals are pyrite and They reported that the combination of sulfide oxidation followed by CFSM treatment significantly improved the gold recovery from 24% to 92%Bacterial oxidation is now considered to be a proven commercial technique for the treatment of refractory sulfide gold concentrates. Since 1986 the technique has been applied successfully on a commercial scale for the removal of arsenopyrite and pyrite to give high gold extractions on cyanidation (Van Aswegen et al., Bacterial oxidation of refractory gold concentrates
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