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Pressure oxidation (POX) is one of the most common and reliable methods of processing gold-bearing sulfide concentrates. However, when processing

PRESSURE OXIDATION OF REFRACTORY GOLD ORES: THE

Pressure Oxidation Pressure oxidation is employed to liberate gold and silver in refractory sulfide concentrates often and ores. The main pressure oxidation products from iron sulfide minerals are sulfuric acid (and metal sulfates) and hematite. Depending on the conditions within the autoclave, acid containing iron compounds can be formed.

Pressure Oxidation of a Refractory Sulfide Concentrate and ...

Aug 11, 2018 · 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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Jan 01, 2005 · The utilization of a pressure-oxidation circuit to treat refractory gold ores or concentrates is a complex decision, taking into consideration capital costs, operating costs, gold recovery, and environmental impacts. The payback and internal rate of return (IRR) has to be evaluated in the decision for selecting the process.

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The aqueous pressure oxidation of gold bearing arsenopyrite concentrates in alkaline solution was investigated as a function of O2, pressure and NaOH concentration. Dissolution of gold from the ...

Gold recovery from refractory gold concentrates by ...

Pressure oxidation technology for the treatment of refractory gold concentrates has been deployed in some countries. Shuiyindong gold deposit is one of the Carlin-type deposits which is a typical difficult-to-treat gold deposit, located in Guizhou province in western China. It was the first application of acid pressure oxidation in China.

(PDF) Alkaline Pressure Oxidation of a Gold-Bearing ...

The aqueous pressure oxidation of gold bearing arsenopyrite concentrates in alkaline solution was investigated as a function of O2, pressure and NaOH concentration. Dissolution of gold from the ...

Pressure Oxidation Pretreatment of Refractory Gold ...

Pressure oxidation of gold containing concentrates and ores is an effective pretreatment for liberating refractory gold. This is particularly true when an appreciable portion of the gold is associated with sulfides and is not amenable to conventional cyanidation. A brief review of the literature on pressure oxidation of refractory gold materials is presented. The chemistry of the aqueous ...

Research on chlorination leaching of pressure-oxidized ...

Jun 01, 2020 · The optimum conditions for leaching the gold in the refractory gold concentrates pretreated with the pressure oxidation are as follows: 4 of pH, above 1.0 V of the redox potential, 75 g/L of the NaCl concentration, and 40 °C of the leaching temperature, 3:1 of the liquid-solid ratio, and 2 h of the reaction time.

Pressure Oxidation Overview - ScienceDirect

Jan 01, 2016 · Pressure oxidation of gold ores is therefore a pretreatment leaching step to enhance gold recovery. Although pressure oxidation of gold ores and concentrates does not directly recover gold in a strict sense of the above definition, it is an essential step to enable the gold to be recovered.

process for the treatment of refractory gold concentrates

increase gold particle exposure, preliminary treatment of the concentrates is necessary [5,6]. Oxidation roasting and aqueous pressure oxidation are two processes that have found widespread industrial application for the treatment of refractory sulphide gold ores [3,7]. Bacterial oxidation is .

Amursk Pressure Oxidation (POX) Hub Expansion Project

Challenges. Polymetal International Inc. is undertaking the Amursk POX Hub Expansion to recover gold from double-refractory (high carbon) sulphide concentrate from five of their mines in Siberia, Eastern Russia, and East Kazakhstan. The project will double Polymetal’s concentrate treatment capacity to 250,000-300,000 t/a of refractory gold concentrate.

Pressure oxidation leaching of chalcopyrite. Part I ...

May 01, 2007 · Pressure oxidation has also been evaluated for the Guelb Moghrein copper–gold deposit but was abandoned to develop facilities for the production of a copper–gold concentrate. Concentrate from the Konkola deposit (owned by Konkola Copper Mines plc) was also shown to leach well at 200 °C, however, conventional processing techniques are still ...

gold mining crushing plants - gold concentrate

There are many various gold mining plants, ... there are other less expensive methods to get the gold concentrate. ... crushing equipment is suitable for gold ..... Mining Project Presure Of Oxidation Gold Concentrate China

Gold extraction - Wikipedia

Generally, recovery of the gold from the sulfide concentrates requires further processing, usually by roasting or wet pressure oxidation. These pyrometallurgical or hydrometallurgical treatments are themselves usually followed by cyanidation and carbon adsorption techniques for

Gold deportment and leaching study from a pressure ...

Pressure oxidation (POX) is an effective method for base metal extraction and a pretreatment of refractory gold ores. A residue from pressure leaching of chalcopyrite concentrate was collected and investigated for gold recovery and deportment of metals.

Peter Zaytsev - Head of Research and Technology - SRC ...

The project included laboratory testwork on pressure oxidation of copper-gold concentrate from the Middle East deposit. The concentrate contained Cu 23%, Fe 29%, S 39%, Au 1,1 gpt. My contribution was as follows: 1) General project management 2) Lab testwork planning and budgeting 3) POX, CIL, sedimentation and filtration testwork management

Oxidation of a refractory gold concentrate using pressure ...

*This is an abstract only. No full paper was prepared for this abstract. CITATION:Casingena, C, Czerny, C, Paterson, L and Carter, P, 2019. Oxidation of a refractory gold concentrate using pressure, atmospheric and bacterial oxidation processes, in Proceedings World Gold 2019, p 681 (The Australasian Institute of Mining and Metallurgy: Melbourne).

Alkaline Pressure Oxidation of a Gold- Bearing ...

The aqueous pressure oxidation of gold bearing arsenopyrite concentrates in alkaline solution was investigated as a function of O, pressure and NaOH concentration. Dissolution of gold from the leach

Alkaline Pressure Oxidation of a Gold-Bearing Arsenopyrite ...

The aqueous pressure oxidation of gold bearing arsenopyrite concentrates in alkaline solution was investigated as a function of O2, pressure and NaOH concentration. Dissolution of gold from the leach residue was accomplished by standard cyanidation. Gold extraction was found to be proportional to the degree of arsenopyrite oxidation. Alkaline pressure oxidation at 160°C, 2413 kPa O2, and 2 M ...

Pilot Plant Pressure Oxidation of a Refractory Gold-Silver ...

Jan 01, 2013 · ABSTRACT Pressure oxidation tests have been conducted by Sherritt for a refractory gold-silver project in China. The feed contained 39 g/t Au and 970 g/t Ag; the major gold-bearing minerals were pyrite and arsenopyrite.

Basic Iron Sulphate in Pressure Oxidation Processing

Refractory gold concentrates often contain sub-microscopic gold that is encapsulated within the crystal matrix of iron sulphide minerals such as pyrite, pyrrhotite and arsenopyrite. To recover the gold, the host mineral must generally be broken down chemically, by oxidative processes such as roasting, pressure oxidation or bacterial

Energy requirements for the pressure oxidation of gold ...

A variety of feed materials may be subjected to pressure oxidation of their sulfide content to liberate gold contained therein for later recovery by cyanidation. Energy is required to pump the feed slurry into the pressurized reaction vessel, to heat the slurry to the reaction temperature, to supply oxygen, and to agitate the slurry and disperse the oxygen. At a certain grade of sulfide ...

Pressure oxidation overview - ResearchGate

High-temperature pressure oxidation is widely used to process refractory gold ores and concentrates (3) (4) . The POX is usually conducted at temperatures 190 -230 °C and oxygen overpressure up ...

process for the treatment of refractory gold concentrates

increase gold particle exposure, preliminary treatment of the concentrates is necessary [5,6]. Oxidation roasting and aqueous pressure oxidation are two processes that have found widespread industrial application for the treatment of refractory sulphide gold ores [3,7]. Bacterial oxidation is .

gold mining crushing plants - gold concentrate

There are many various gold mining plants, ... there are other less expensive methods to get the gold concentrate. ... crushing equipment is suitable for gold ..... Mining Project Presure Of Oxidation Gold Concentrate China

Refractory Gold Ore Treatment Methods

Jul 14, 2016 · The oxidation may also open up the fissure planes, setting free the associated gold. This oxidation may be secured by “weathering” the ore pulp, but in some cases, the agitation of the wet pulp with small amounts of lime and sodium peroxide, together with injected air prior to the addition of cyanide, may be effective.

PRESSURE LEACHING - RPMGlobal

of pressure oxidation of The most recent sulfide pressure oxidation plant development has been the processing of copper concentrates. Copper concentrate leaching has been applied as long ago as 1964 at Manduel GOK in the USSR and the Sunshine Mine process plant at Kellogg, Idaho (1980), but copper concentrate leaching was advanced to larger ...

CN104805281A - Method for leaching sulfide gold ...

The invention relates to a method for leaching sulfide gold concentrate by virtue of combination of acid pressure leaching and alkali pressure leaching. The method comprises an acid pressure leaching pretreatment stage and an alkali pressure leaching stage; firstly, in an acid pressure leaching process, reaction conditions are controlled, so that sulfides are oxidized, part of elemental sulfur ...

Basic iron sulfate — a potential killer in the processing ...

May 01, 2010 · Refractory gold concentrates often contain submicroscopic gold that is encapsulated within the crystal matrix of iron sulfide minerals, such as pyrite, pyrrhotite and arsenopyrite. To recover the gold, the host mineral must generally be broken down chemically by oxidative processes, such as roasting, pressure oxidation or bacterial leaching, which expose the gold for subsequent recovery by ...

Development of a Production Scheme for Processing ...

Jan 25, 2018 · The process is intensified at high temperature and pressure. However, as practice has shown, with the use of an autoclave at Yuzhuralzoloto on one hand an increase in temperature facilitates intensification of the copper dissolution process and oxidation of sulfides, and on the other formation of calcium sulfate (at a temperature above 110°C) that leads to the formation of gypsum deposits in ...