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automatic stone crushing machine prices

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 material, including mine ...

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Flotation and cyanidation of a semi-refractory gold ore

2015-12-27  contain considerable amounts of base metal sulphides. Alkaline pre-aeration is the major option to treat semi-refractory sulphide ores (La Brooy and Komosa, 1992). Pre-aeration reduces the oxygen demand during cyanidation by passivating the surface of pyrrhotite by transforming Fe(II) to Fe(III), which reacts sluggishly with cyanide.

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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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(PDF) Assesment of Ammoniacal Ammonium Sulphate

Effect of pre-aeration (2 L/min) and ammoniacal ammonium sulphate leaching (AASL) (0.5 M NH 3 +0.5 M (NH 4 ) 2 SO 4 ) on the extraction of gold (1.5 g/L NaCN) ... copper-bearing gold

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Atmospheric alkaline pre-oxidation of refractory sulphide ...

Gold extraction was seen to rise in most cases after an increased rate of aeration during pre-treatment. Finally, the iron-sulphide ores tested responded extremely favourably to raised temperatures, showing both increased iron and sulphur oxidation, as well as higher gold extractions.

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(PDF) An Overview of Treatment of Copper-gold Ores

The pre-treatment of the ore substantially improved the extraction of gold in subsequent cyanide leaching with large recovery (i.e. 97-98%) over 8 h, while, cyanide consumption

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Effect of Oxidative Pretreatment and Lead Nitrate Addition ...

2019-11-1  Cyanidation is the main process in gold leaching. There are several parameters that affect gold recovery and cyanide consumption. In this paper, the effect of the oxidative pretreatment and lead nitrate addition on the cyanidation of Zarshuran refractory gold ore containing 3.32 ppm Au, 1.09% As, and 0.5% sulfur were investigated. Au recovery was increased from 79.4% to 89.4% in the presence ...

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Gold Metallurgy Leaching in Cyanicides

2016-7-14  Gold Metallurgy Leaching in Cyanicides. Cyanidation as applied to ordinary gold and silver ores is a relatively simple process. When cyanicides {cyanide-consuming

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The influence of pyrite pre-oxidation on gold recovery by ...

The influence of pyrite pre-oxidation in alkaline solutions on gold recovery by cyanidation from Twin Creek refractory gold ore in which pyrite was identified as the major sulfide mineral has been investigated with the aid of electrochemical measurements, leaching experiments, and direct analysis of

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INFLUENCE OF PRE-AERATION ON CYANIDE LEACHING

2016-5-31  and aeration could not provide a reduction in the cyanide consumption. Therefore, the effect of the pre-aeration followed by cyanidation was tested. Eventually, applying 4 h of pre-aeration before a shorter leaching duration of 12 h provided 92.0% Au and 90.5% Ag extractions with a

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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

refractory gold ores with As. Pretreatment options for deal-ing with refractory gold ores are illustrated in Fig. 1 and described in detail in the subsequent sections. 2. Roasting Oxidation Pretreatment So far, the application of roasting oxidation pretreatment has a history

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METHOD FOR PRE-TREATMENT OF GOLD-BEARING OXIDE

The disclosure relates to pre-treatment of precious metal-bearing oxide ores, prior to precious metal leaching by thiosulfate. The process comprises mixing oxide ore in oxygenated water in the presence of a carbon-based material (e.g., activated carbon or other type of carbon).

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Effect of Oxidative Pretreatment and Lead Nitrate Addition ...

2019-11-1  Cyanidation is the main process in gold leaching. There are several parameters that affect gold recovery and cyanide consumption. In this paper, the effect of the oxidative pretreatment and lead nitrate addition on the cyanidation of Zarshuran refractory gold ore containing 3.32 ppm Au, 1.09% As, and 0.5% sulfur were investigated. Au recovery was increased from 79.4% to 89.4% in the presence ...

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Flotation of gold and gold-bearing ores - ScienceDirect

2005-1-1  Copper–gold ores. Copper–gold ores are significant contributors to the overall world gold production. Flotation is the principal process for pre-concentration of the copper–gold minerals for subsequent smelting treatment. Gold recovery, although important, is not always considered when optimizing the copper circuit.

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Atmospheric alkaline pre-oxidation of refractory sulphide ...

Gold extraction was seen to rise in most cases after an increased rate of aeration during pre-treatment. Finally, the iron-sulphide ores tested responded extremely favourably to raised temperatures, showing both increased iron and sulphur oxidation, as well as higher gold extractions.

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Establishing thE ProcEss MinEralogy of gold orEs

gold ores: Antimony, bismuth sulfide and telluride gold ores are often somewhat refractory due to the presence of slow-dissolving gold minerals such as aurostibite, maldonite and gold tellurides. Carbonaceous ores: The gold is fine, and, usually, is predominantly associated with the sulfides (pyrite or arsenopyrite) that are present in carbonaceous

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BACTERIAL LEACHING AS A PRE-TREATMENT STEP FOR

2005-1-28  Various pre-oxidation methods of refractory ores and concentrates are commonly used to improve precious metal recoveries. For example, oxidative roasting has been used in some cases as a pre-oxidation step before cyanidation. Roasting removes harmful constituents by oxidation or volatilization, and liberates gold from pyrite or arsenopyrite.

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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 recovery by subsequent treatment techniques (Haque, 1987).

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The leaching and adsorption behaviour of gold ores

2020-8-28  4.4 the effect of copper cyanide on gold leaching from oxide and sulphide ores 110 4.5 summary 114 chapters preg-robbing phenomena in the cyanidation of gold ores 116 5.1 objectives of this chapter 116 5.2 background information 116 5.3 preg-robbing behaviour by the ores at low cyanide concentrations 118

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(PDF) Pre-treatment of a Copper-rich Gold Ore for ...

Keywords: Copper-gold ore, cyanid e leaching, pre-treatment, sulphuric acid, hydrogen peroxide. Abstract. In recent years, copper-bearing gold ores have proved to be difficult to treat since ...

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Gold extraction - QueensMineDesignWiki

2019-6-28  The process options for oxygen consuming ores are thus to use alkaline pre-oxidation, or aeration and flotation, followed by a cyanide leach with oxygen addition. Preg-Robbing Complex Ores. Preg-robbing occurs when a gold cyanide complex is removed from solution by some component of the ore.

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The influence of pre-aeration on cyanide leaching of a non ...

Therefore, the effect of the pre-aeration followed by cyanidation was tested. Eventually, applying 4 h of pre-aeration before a shorter leaching duration of 12 h provided 92.0% Au and 90.5% Ag extractions with a reduced NaCN consumption of 2.44 g/dm3.

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Atmospheric alkaline pre-oxidation of refractory sulphide ...

Gold extraction was seen to rise in most cases after an increased rate of aeration during pre-treatment. Finally, the iron-sulphide ores tested responded extremely favourably to raised temperatures, showing both increased iron and sulphur oxidation, as well as higher gold extractions.

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Associated Sulfide Minerals in Thiosulfate Leaching of ...

2020-2-24  High copper concentration and a pre-aeration step was also found to largely increase the gold extractions under such conditions. Thiosulfate-copper-ethylenediamine system was found effective in the leaching ... LEACHING OF NATURAL GOLD ORES WITH THIOSULFATE.....19 2.5. ASSOCIATED MINERALS IN THIOSULFATE LEACHING OF ...

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The Gold Ore Processing Methods According to The ...

2021-2-8  Gold ores with the internal competition may be due to the presence of natural carbonaceous materials that can adsorb gold in the ores. For this type of gold minerals, Cl2 should be pre-oxidized (flash chlorination) to reduce the activity of carbonaceous materials.

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BACTERIAL LEACHING AS A PRE-TREATMENT STEP FOR

2005-1-28  Various pre-oxidation methods of refractory ores and concentrates are commonly used to improve precious metal recoveries. For example, oxidative roasting has been used in some cases as a pre-oxidation step before cyanidation. Roasting removes harmful constituents by oxidation or volatilization, and liberates gold from pyrite or arsenopyrite.

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A fundamental study of the alkaline sulfide leaching of gold

2015-12-27  These ores are often refractory, as the gold is encapsulated within the sulfide matrix. In order to recover the gold, the host matrix must be destroyed. Over the past 100 years, roasting or smelting has been the dominant method for oxidising sulfide bearing gold ores and concentrates. However, with the cost

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Gold Ore Presentation Mining Gold

2014-2-19  Gold ore types and characteristics Gold ores Gold: Process and Mineralogy Most noble metal, native occurrence Also associated with silver, tellurium, bismuth and PGMs typical ore grades: 0.5 to 20 g/t Primary gold source: ores Secondary gold sources. gravity concentrates flotation concentrates plant tailings refinery tailings recycled gold

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Improving gold recovery of Pb–Zn sulfide ore by selective ...

2015-1-4  Free gold and gold wrapped in sulfides are considered as the object of gold floatation. However, floatation of free gold exhibits more variables in practice. In this study, improving gold recovery of a Pb–Zn sulfide ore from Yunnan Province, China, was investigated. The results show that free gold and auriferous sulfides account for 94.99 % of total gold. Without adding organic acid in ...

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