A Pretreatment of Refractory Gold Ores Containing Sulfide …

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 ore gold and pretreatment 2012 – Grinding Mill China

Pretreatment of Refractory Ore in Gold ore … Pretreatment of Refractory Ore in Gold ore processing. As mentioned above, refractory ores have to be pretreated by … » Free Online Chat. Pretreatment of copper-bearing refractory gold ore … Posted on April 27, 2012 by … The gold ore used in this study was refractory because it was companied ...

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The mechanism of ultrasound oxidation effect on the pyrite for

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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Recent challenges in biological cyanidation and oxidation of …

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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Improved gold and silver extraction from a refractory …

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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Mineralogical characterization and pretreatment for antimony …

[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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Improved gold and silver extraction from a refractory …

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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Nitric Acid Pretreatment Applied to Refractory Gold …

nitric acid in the pretreatment of refractory gold ores (Nitrox and Arseno/Redox process) [16– 18]. The values for the C variable (agitation speed) were chosen in a range suitable to

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Advancements in improving gold recovery from refractory gold ores

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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Biological pretreatment of carbonaceous matter in double refractory

The pretreatment of carbonaceous material in double refractory gold ores (DRGO) is necessary to decrease preg-robbing of gold and maximize gold recovery. DRGO contains of carbonaceous matter and gold grains encapsulated in sulfide minerals, which typically results in very poor gold recovery.However, there is growing interest in DRGO because some estimates …

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Pretreatment Process on Refractory Gold Ores with …

Several different classes of process options for pretreating refractory ores are considered. These options include: roasting oxidation; wet chemical treatment; bacterial peroxidation; and other pretreatments such as: …

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Testing Refractory Gold Ore

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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Refractory gold ores in Archaean greenstones, Western Australia

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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Oxidation of sulfide mineral and metal extraction analysis in the

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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Pretreatment of refractory gold ore by curing with concentrated

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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Nitric Acid Pretreatment Applied to a Refractory Gold-Tellurides Ore

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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Microbial Pre-Treatment of Double Refractory Gold Ores

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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Recovery Refractory Resources

Refractory gold ore needs pre-treatment for cyanidation to be effective in gold recovery. Ailbhe Goodbody looks at the advantages and disadvantages of the most common pre-treatment …

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Base metal citrate pretreatment of complex ores to improve gold …

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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Pretreatment of a refractory arsenopyritic gold ore using hydroxyl ion

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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Recovery of gold from sulfide refractory gold ore: Oxidation …

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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Nitric Acid Pretreatment Applied to a Refractory Gold-Tellurides Ore

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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Gold Extraction from a Refractory Ore Using Calcium …

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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Mineralogical characteristics and treatment of refractory gold ores

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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Influence of potassium hydroxide pretreatment on the extraction of gold

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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Selective alkaline leaching of antimony from Low-grade refractory gold

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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Unlock Refractory Gold with ALS: Cutting-Edge Pre …

ALS offers expert solutions for refractory gold ore processing. Our advanced pre-treatment options and customized testing programs ensure maximum gold extraction efficiency.

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Mineralogy and Pretreatment of a Refractory Gold …

The technological mineralogy of a gold deposit located in North-Western province of Zambia was carried out by using X-ray fluorescence spectroscopy (XRF), X-ray diffraction spectroscopy (XRD), and scanning …

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Getting a Handle on Refractory Ore May Determine Gold's Near …

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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Sulphidic refractory gold ore pre-treatment by selective and bulk

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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