pretreatment of refractory ores prior to gold leaching
Review Pretreatment Process on Refractory Gold Ores
3.1. Alkaline Leaching Pretreatment Alkaline leaching pretreatment is a chemical pretreatment process which can oxidize and dispose of components of the ore through adding chemical reagents. Meng Yuqun, Wu Minjie, etc. have researched to strengthen Fig. 1. General process options for pretreating refractory gold ores. Fig. 2.
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(PDF) A Preliminary Study on Nitric Acid Pre-treatment of ...
This study was undertaken to evaluate the nitric acid leaching as a potential pre-treatment process prior to cyanidation of refractory gold/silver ores. The
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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
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Pretreatment Process on Refractory Gold Ores with As
The process of crushing or decomposition before gold leaching is called pretreatment of refractory gold. Statistics show that, in the world, about 2/3 gold resource belongs to the difficult processing ores, and about 1/3 total output of world gold is produced from refractory gold. This proportion will further increase in future.
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Potential pre-treatment and processing routes for
2021-3-11 · et al, 2018). In refractory gold ores, the gold is highly encapsulated in the sulfide matrix and pre-treatment is an important process to recover gold from the sulfide minerals. The sulfide minerals interfere with recovery of gold thus it is imperative to remove the sulfide minerals prior to leaching.
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An evaluation of pretreatments to increase gold recovery ...
2000-1-1 · Swash, P.M., A Mineralogical Investigation of Refractory Gold Ores and Their Beneficiation, with Special Reference to Arsenical Ores, Journal of the South African Institute of Mining and Metallurgy, 1988, 88(5), 173-l 80. Thomas, K.G., arrick Gold Autoclaving Processes In Proc. of World Gold 91, Cairns, Queensland, 1991, pp 89-97.
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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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280 RECENT ADVANCES IN THE TREATMENT OF
2015-8-6 · oxidation as a pretreatment method for refractory gold ores has been published by Berezowsky and Weir (6). According to them, the first patent on the use of pressure leaching for preoxidation of arsenical gold ores was granted to the Chemical Construction Company (Chemico) in 1955 (7). Two
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Hypochlorite pretreatment in heap leaching of a low grade ...
1991-2-1 · The concept of hypochlorite treatment prior to cyanidation in the heap leaching of low grade carbonaceous gold ores is discussed. Laboratory column leach tests using a low grade carbonaceous ore were performed to investigate the effects of pH, hypochlorite consumption and concentration, and bed height on total gold extraction. At high pH, hypochlorite stability
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(PDF) APPLICATION OF DIAGNOSTIC LEACHING
2022-2-1 · diagnostic leaching was performed on refractory gold ore containing 5.9% pyrrhotite, 0.9% pyrite, 1.3%. arsenopyrite and bulk concentrates generat ed from the flot ation tests. Results showed that ...
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Application Note Refractory Gold Pretreatment - pH
2020-6-18 · Refractory Gold Pretreatment - pH Mining: Gold Processing Refractory gold ores are defi ned as containing minerals or carbon compounds that trap encapsulated gold and make leaching extraction diffi cult. These types of ores require pretreatment prior to cyanidation. Options for pretreatment include the following processes: • Roasting
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Potential pre-treatment and processing routes for
2021-3-11 · et al, 2018). In refractory gold ores, the gold is highly encapsulated in the sulfide matrix and pre-treatment is an important process to recover gold from the sulfide minerals. The sulfide minerals interfere with recovery of gold thus it is imperative to remove the sulfide minerals prior to leaching.
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Optimizing the alkaline oxidation pretreatment of a ...
2018-9-28 · Ultrafine grinding was proposed as a pretreatment method prior to cyanide leaching of a gold-silver ore. About 91.92% Au and 82.15% Ag were extracted after ultrafine grinding under optimum leaching conditions such as 150 kg t −1 quicklime dosage, 25% pulp density, 85 °C leach temperature, 500 g t −1 cyanide concentration and 90 h leaching ...
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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 ...
Read More
Hypochlorite pretreatment in heap leaching of a low grade ...
1991-2-1 · The concept of hypochlorite treatment prior to cyanidation in the heap leaching of low grade carbonaceous gold ores is discussed. Laboratory column leach tests using a low grade carbonaceous ore were performed to investigate the effects of pH, hypochlorite consumption and concentration, and bed height on total gold extraction. At high pH, hypochlorite stability
Read More
Recovery Refractory Resources - SGS
Dr Fleming says: “Prior to the 1970s, roasting was the only process available to metallurgists for treatment of refractory gold ores and it was applied in most of The advantages that Gold Fields’ BIOX offers are very project-specific, but the company says that it has seen improved rates of gold recovery A sample of vein gold from
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280 RECENT ADVANCES IN THE TREATMENT OF
2015-8-6 · oxidation as a pretreatment method for refractory gold ores has been published by Berezowsky and Weir (6). According to them, the first patent on the use of pressure leaching for preoxidation of arsenical gold ores was granted to the Chemical Construction Company (Chemico) in 1955 (7). Two
Read More
Pretreatment of Copper Sulphide Ores Prior to Heap ...
A novel process for silver recovery from a refractory Au-Ag ore in cyanidation by pretreatment with sulfating leaching using pyrite as reductant. Hydrometallurgy 2014, 144–145, 34–38. [Google Scholar] Mesa Espitia, S.L.; Lapidus, G.T. Pretreatment of a refractory arsenopyritic gold ore using hydroxyl ion.
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Effect of Pretreatment of Sulfide Refractory Concentrate ...
2013-12-24 · For extraction of gold from refractory ores or concen- trate, in which gold is surrounded or covered by iron sul- fide minerals, mainly arsenopyrite and pyrite, mineral oxidative pretreatment is essential to oxidize sulfides and to expose gold to the leaching solution. Pyrometallurgi- cal oxidation by roasting is under environmental restric-
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Pressure Oxidation of a Refractory Sulfide Concentrate and ...
2018-8-11 · Pressure oxidation of the refractory sulfide/carbonaceous ores has gained world-wide acceptance. Compared with roasting, pressure oxidation yields higher gold extractions from ores or concentrates and enables better handling of environmentally sensitive impurities. Normally, gold is extracted from neutralized autoclave leach residue by cyanidation.
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Developments in the pretreatment of refractory gold ...
2009-11-20 · mineralogy of ores being encountered in which gold is locked up in various sulphidic host minerals. Gold ores are classified as highly refractory when at least 80% of the gold cannot be extracted by conventional cyanidation leaching even after fine grinding. A very common cause of refractoriness is the dissemination of fine grained or
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Application Note Refractory Gold Pretreatment - pH
2020-6-18 · Refractory Gold Pretreatment - pH Mining: Gold Processing Refractory gold ores are defi ned as containing minerals or carbon compounds that trap encapsulated gold and make leaching extraction diffi cult. These types of ores require pretreatment prior to cyanidation. Options for pretreatment include the following processes: • Roasting
Read More
280 RECENT ADVANCES IN THE TREATMENT OF
2015-8-6 · oxidation as a pretreatment method for refractory gold ores has been published by Berezowsky and Weir (6). According to them, the first patent on the use of pressure leaching for preoxidation of arsenical gold ores was granted to the Chemical Construction Company (Chemico) in 1955 (7). Two
Read More
MODELING OF HIGH PRESSURE PRETREATMENT
2018-10-22 · Keywords: pretreatment process, pressure oxidation, refractory gold ore and concentrate, leaching, modeling Investigation of high pressure pretreatment process for gold leaching is the objective of the present master's thesis. The gold ores and concentrates which cannot be easily treated by leaching process are called "refractory".
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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 ...
Read More
Gold Leaching from Refractory Ores—Literature Survey ...
2007-4-27 · However, pretreatment processes involving thermal oxidation, such as roasting, chemical oxidation, such as acid leaching, acid or alkaline pressure leaching; or biological oxidation such as bioleaching with T. Ferrooxidans liberates gold from refractory minerals. Gold is then recovered from the oxidized mass by alkaline cyanidation.
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Recovery Refractory Resources - SGS
Dr Fleming says: “Prior to the 1970s, roasting was the only process available to metallurgists for treatment of refractory gold ores and it was applied in most of The advantages that Gold Fields’ BIOX offers are very project-specific, but the company says that it has seen improved rates of gold recovery A sample of vein gold from
Read More
BACTERIAL LEACHING AS A PRE-TREATMENT STEP FOR
2005-1-28 · FOR GOLD RECOVERY FROM REFRACTORY ORES In this article, pre-treatment such as bio-leaching before cyanidation is discussed as an alternative technique to treat refractory gold ores containing pyrite and arsenopyrite. There are two methods of bacterial leaching, namely stirred reactor bio-leaching and bio-heap leach processes. The examples of
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(PDF) Application of Diagnostic Leaching Technique for ...
Application of Diagnostic Leaching Technique for Refractory Gold Ores. Ibrahim Alp. Related Papers. Evaluation of Refractory Behaviour of Kaletaş (Turkey) Gold Ore. ... Improved gold and silver extraction from a refractory antimony ore by pretreatment with alkaline sulphide leach.
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Pressure Oxidation of a Refractory Sulfide Concentrate and ...
2018-8-11 · Pressure oxidation of the refractory sulfide/carbonaceous ores has gained world-wide acceptance. Compared with roasting, pressure oxidation yields higher gold extractions from ores or concentrates and enables better handling
Read More