Combined Column and Mechanical Flotation Cell Process …

With higher concentration rates and a simple and efficient flowsheet, the FCSMC has been successfully industrialized for flotation circuits of minerals such as coal and copper ores in China. 21−23 However, there have been relatively few studies on the flotation behavior of columns and cells in gold mineral flotation, particularly concerning …

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The flotation method is a technique widely used for the recovery of gold from gold-containing copper ores, base metal ores, copper nickel ores, platinum group ores and …

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Optimization and mechanism of gold-bearing sulfide flotation

Primary gold-bearing sulfide ore is fine-grained pyrite and arsenopyrite. The paper describes the effects of ratios and dosage of activators and collectors on the …

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Surface Chemistry and Flotation of Gold-Bearing Pyrite

Gold grains are observed in a variety of forms, such as coarse-liberated native gold grains, and ultra-fine grains associated with sulfide or non-sulfide mineral particles, in the form of solid solution in sulfide minerals, mainly pyrite. In the flotation of gold ores, bulk sulfide mineral flotation is generally applied to maximize gold recovery. …

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Gold in Arsenopyrite

As case study for the processing of an ore with a refractory component of visible and invisible Gold associated in and with Arsenopyrite had a gold content in the feed ranged from about 1.0 …

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Flotation of gold and gold-bearing ores

A typical example of a mixed gold ore is one having some level of free or native gold occurring with the remainder being associated with ... smelting). Mixed pyrite-arsenopyrite flotation concentrate, from a given refractory ore, is achieved conventionally with relative ease owing to similarities in flotation response and electrochemical ...

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The practice of pyrite flotation in South Africa and Australia

The flotation of pyrite is of great importance to the gold mining industry in South Africa and Australia. The flotation plants fall into a number of categories, viz. flotation after milling, flotation of current residues and reclaimed residues, flotation of refractory ores and the flotation of gold-copper ores.

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Flotation of auriferous arsenopyrite from pyrite using …

To provide an understanding of the preferential interaction and flotation of Cu-activated arsenopyrite compared to pyrite, Cu species adsorbed, extent of surface oxidation, nature of bond and coordination between donor atoms of IPETC, and Cu and As acceptor atoms on mineral surfaces was investigated using X-ray photoelectrons …

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Sulfide Flotation

The following possibilities exist in the case of sulfidic gold ores: • Bulk sulfide flotation for further treatment (ultrafine grinding [UFG] ... Separation of gold-bearing arsenopyrite from barren pyrite. When attempting to concentrate submicroscopic and in particular solid–solution gold, it is important to keep in mind the following two ...

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The flotation of gold bearing ores — A review

Practical aspects of gold flotation considered include the physical condition of the gold particles (size, shape, zonal variations in composition, composites, surface coatings), general ore mineralogy, specific host minerals for gold (pyrite, arsenopyrite, base metal sulphide minerals, quartz), interfering minerals (pyrophyllite, carbon), and ...

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Bulk flotation of auriferous pyrite and arsenopyrite by …

1.. IntroductionGold generally occurs in association with sulphide minerals including pyrite, arsenopyrite and chalcopyrite. Many techniques are used to process gold ores, such as gravity separation, cyanidation and froth flotation (Tapley and Yan, 2003, Allan and Woodcock, 2001).The flotation of free gold and sulphides plays an important …

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Improved recovery of a low-grade refractory gold ore using flotation …

Montethe et al. examined hydrogen peroxide in the selective flotation of gold from pyrite with potassium amyl xanthatein (PAX) which showed a high selectivity for gold from pyrite at pH l0 and higher, but with a low increase of recovery [2].In the ores which contain free gold, it may be beneficial to involve selective flotation of the free gold to …

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Study of the Technology for Gold Recovery from Gravity-Flotation …

The largest gold ore object in Kazakhstan is the Vasilkovskoye deposit, 17 km northwest of the city of Kokshetau. The Vasilkovskoye deposit belongs to the gold-quartz moderately sulfide formation. The main ore minerals of primary ores are arsenopyrite, pyrite, bismuth minerals and native gold. Arsenopyrite sharply …

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Gold-Pyrite ores

Alternatively using soda ash for pH adjustment can reduce gold depression. Where gold is associated with pyrite in base metal ores where iron sulphides are depressed and report to the tailings, a separate tailings pyrite flotation concentrate should be considered. Producing a pyrite concentrate with associated gold maximizes gold recovery.

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(PDF) Pyrite Flotation: A Review

Main interest in the processing of complex sulfide ores has focused on the rejection of pyrite and selectivity problem that arises owing to the similar electrochemical behavior of pyrite to the...

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Surface Chemistry and Flotation of Gold-Bearing Pyrite

This study shows that low-grade gold-pyrite ores can be enriched by flotation depending on the form of gold in the ore. This allows production of pyrite …

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Optimization and mechanism of gold-bearing sulfide flotation

In order to overcome the difficulty of extracting gold from gold-bearing sulfide ore by cyanide process, flotation was adopted based on mineralogical analysis. Mineralogy shows that gold particles are of superfine structure and mainly enclosed by sulfide ores. Primary gold-bearing sulfide ore is fine-grained pyrite and arsenopyrite. The paper …

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Gold-bearing arsenopyrite and pyrite in refractory ores: …

Gold-bearing arsenopyrite and pyrite in refractory ores: analytical refinements and new understanding of gold mineralogy - Volume 71 Issue 2 22 August 2024: Due to technical disruption, we are experiencing some delays to publication.

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Improved flotation of arsenopyrite by ultrasonic …

Thus, the applicability ofultrasonic pretreatment for refractory gold ores containing arsenopy rite in enhancing flotation recovery of both arsenopyrite and gold is …

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Investigating the selective flotation of auriferous arsenian pyrite …

In complex auriferous ores, pyrite and arsenopyrite are the main hosts of gold. Pyrite and arsenopyrite are often found in close association with each other in this ore type ... (Fig. 3 b) and could imply that there was simultaneous flotation of gold-rich arsenian pyrite with barren sulphides. Thus, a much more complex mineralogical …

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Mineralogy and Pretreatment of a Refractory Gold Deposit …

Gold can be recovered through bulk flotation or selective flotation processes according to the distribution of gold in pyrite and arsenopyrite [24,25]. The selective flotation of arsenopyrite from pyrite can be realized by adding a magnesium–ammonium mixture depressant . As we all know, arsenic is a highly toxic substance that causes …

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Sulphidic refractory gold ore pre-treatment by selective …

A number of papers and several books have been published on the mineralogy of gold in ores [4].A potential problem is also afforded by the very fine-grained nature of some of the arsenical pyrite and arsenopyrite which are intimately intergrown with silicate gangue minerals (see Fig. 1).Adequate recovery of these fine-grained …

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Microwave roasting of flash flotation concentrate containing pyrite …

Nanthakumar et al. (2007) investigated the use of microwave energy in pretreating a double refractory gold ore containing 1.56% sulphur and 5.96% total carbon. Wei et al (2009) applied microwave energy in a similar pretreatment of refractory gold ores and reported improvements in the subsequent gold extraction.

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Investigating the selective flotation of auriferous arsenian pyrite …

The selective flotation of pyrite from arsenopyrite was achieved at around pH 11, employing HTA without using any regulators to depress arsenopyrite. ... Gold was recovered from one copper-bearing ...

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The flotation of gold bearing ores — A review

PREFERENTIAL DEPRESSION-FLOTATION Many gold bearing ores consist of mixtures of sulphides and hence it is often necessary to carry out a differential flotation which may involve the selective depression of one or more ores. Pyrite-Arsenopyrite It is often found that gold is associated with arsenopyrite in a pyrite …

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Decoupling pyrite and arsenopyrite in flotation using …

Pyrite and arsenopyrite have oxidised surface species with higher extent oxidation observed for the latter than the former under alkaline pH. For flotation of pyrite …

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The influence of the oxidation state of pyrite and arsenopyrite …

In this paper, the influence of the oxidation state of pyrite and arsenopyrite on the flotation of an auriferous sulphide ore was investigated by different techniques, including electrode, pulp potentials, DRIFT spectroscopy and microflotation tests. In addition, the gold and sulphide recoveries were also investigate, in a laboratory-scale …

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Flotation of gold and gold-bearing ores

The depression of pyrite at high pH values can be overcome by the addition of more collector, stronger collector and copper sulfate. Pyrrhotite floats best in acid circuits. The pH range for flotation for gold sulfide ores containing pyrite and arsenopyrite is generally between 7 and 9.

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Ultrafine Grinding

In 1993, the Salsigne Gold Mine was reopened. Salsigne treated a gold-bearing pyrite/arsenopyrite ore by flotation, with the flotation tails treated in a CIL circuit and the concentrate reground in a conventional mill to approximately 25–30 μm. The oxygen demand for reground concentrate was high and the rate of oxidation was slow.

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A Brief Review of Auriferous Sulphide Flotation …

Separation of gold predominated arsenopyrite minerals from less economical pyrite phase maximises downstream unit feed and improves financial performance of the operation. This paper briefly ...

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A review of the effects of grinding media and chemical conditions …

Refractory gold ores are classified as if a cyanidation process cannot recover more than 80% of gold even though fine grinding is used (Guay, 1981). The reason for the refractoriness of gold ores is either because gold is hosted in solid solution, or as colloidal particles, in pyrite and/or arsenopyrite.

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Flotation Practice in Gold Mines

Flotation reagents at the Stawell Gold Mine in Victoria, Australia, where carbonaceous pyrite–pyrrhotite gold ores with minor quantities of arsenopyrite are floated at a slightly elevated pH value, include copper sulfate, PAX and Terric 407 frother.

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Automated Mineralogy and Diagnostic Leaching Studies on …

Obtaining detailed and precise information from a classified refractory gold ore has been a long-standing challenge in mineral processing and process mineralogy. Although the concept of diagnostic leaching has been extensively addressed in the literature, very little information is available linking this approach with current advanced …

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