Pressure Oxidation Refractory Gold

PRESSURE OXIDATION OF REFRACTORY GOLD ORES: THE

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. Such compounds include basic iron sulfate (BFS) and jarosites. The

Pressure oxidation Wikipedia

Pressure Oxidation is a process for extracting gold from refractory ore.. The most common refractory ores are pyrite and arsenopyrite, which are sulfide ores that trap the gold within them.Refractory ores require pre-treatment before the gold can be adequately extracted. The pressure oxidation process is used to prepare such ores for conventional gold extraction processes such as cyanidation.

Pressure Oxidation Pretreatment of Refractory Gold

1/2/1984· 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.

Oxidation of a refractory gold concentrate using pressure

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).

PRESSURE OXIDATION OF PYRITE-ARSENOPYRITE REFRACTORY

Pressure oxidation of pyrite-arsenopyrite refractory gold concentrate 105 350 kPa, 15%) or increased very slowly (test 3, 165°C, 1050 kPa, 5%). At higher tem-perature and oxygen pressure the oxygen consumption was more rapid and reached a steady level in 55–60 minutes (test 9 I, 195°C, 700 kPa, 10%). At highest temperature

Pressure Oxidation Mining SGS

Pressure oxidation (POX), high pressure oxidation (HiPOX) and ACTIVOX autoclave leaching are viable industry-standard technologies used to recover gold and other accessory metals. Read more The process is particularly well suited for treating refractory gold ores, which give low recovery when directly leached with cyanide.

ALTA MetBytes What's Happening in Gold Ore Processing

implemented by Barrick to treat double refractory gold ore following pressure oxidation at its Goldstrike Mine in Nevada, USA. The CSIRO reagent system is an alternative to cyanide and has particular application where cyanide cannot be used and to unlock stranded high-grade deposits. CSIRO in collaboration with Eco Minerals Research Limited, Australia, commenced a project in July 2017 to

Pressure Oxidation of a Refractory Sulfide Concentrate and

Significant advances have taken place in the treatment of refractory gold ores and concentrates during the past decade. In sulfide ores, pyrite is the most common host mineral for gold. Studies by Gasparrini (1983) showed that gold occurs in pyrite as native gold or electrum in all sizes and forms. Arsenopyrite is probably the second most common host for gold and forms similar associations

A FUNDAMENTAL STUDY OF THE ACIDIC PRESSURE OXIDATION

refractory gold ores, has been studied by investigating the reaction chemistry and kinetics. The effects of retention time, temperature, particle size, oxygen partial pressure, pulp density, sulfuric acid concentration, and cupric ions were evaluated for both minerals. The effect of ferric ions on the oxidation rate of As(III) to As(V) was also examined. Also, the effects of mole ratio of Fe

Oxidation of a refractory gold concentrate using

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).

Pressure Oxidation Pretreatment of Refractory Gold

1/2/1984· 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.

Pressure Oxidation Process peter&x Outotec

Outotec can provide a complete pressure oxidation plant including all auxiliary processes for refractory gold sulfide oxidation. Gold is efficiently released from the sulfide matrix for the subsequent leaching process, whether cyanidation or chloride leaching. The Outotec pressure oxidation main process steps: Carbonate and chloride removal

Method for pressure oxidizing gold-bearing refractory

The present invention is particularly well-suited for pressure oxidation treatment of refractory gold-bearing sulfide mineral materials that demonstrate poor gold recoveries due to the presence of organic carbonaceous material when subjected to traditional pressure oxidation conditions in the presence of the halogen-containing material. Traditional severe pressure oxidation conditions include

pressure oxidation refractory gold pdsasa

Pressure Oxidation is a process for extracting gold from refractory ore.. The most common refractory ores are pyrite and arsenopyrite, which are sulfide ores that trap the gold within ores require pretreatment before the gold can be adequately extracted. The pressure oxidation process is used to prepare such ores for conventional gold extraction processes such as cyanidation.

A FUNDAMENTAL STUDY OF THE ACIDIC PRESSURE OXIDATION

refractory gold ores, has been studied by investigating the reaction chemistry and kinetics. The effects of retention time, temperature, particle size, oxygen partial pressure, pulp density, sulfuric acid concentration, and cupric ions were evaluated for both minerals. The effect of ferric ions on the oxidation rate of As(III) to As(V) was also examined. Also, the effects of mole ratio of Fe

The Leachox™ Refractory Gold Process The Testing, Design

The Leachox refractory gold process has to date been applied to the selectivetreatment of Processes such as roasting, pressure oxidation, and bacterial oxidation are all aimed at breaking down the sulphide matrix to liberate gold. Ultra-fine grinding performs the same function particularly where gold is locked in silicates or other minerals. Many of these processes are well developed and

ALTA Gold 2012 E-Doc Albion Process

leaching to the aggressive conditions found in pressure oxidation. The gold and sulphur (sulphides and elemental sulphur) grades relate directly to the economics of the process. Much has been written about the suitability of particular pretreatment processes, such as pressure oxidation, bio oxidation and roasting, for specific ores bodies (1-4). More recent technologies such as the Albion

Developments in the pretreatment of refractory gold

processing refractory gold ores, especially development in the pretreatment of refractory gold minerals by nitric acid. These processes include the high-pressure and the atmospheric-pressure oxidation methods. High-pressure oxidation processes are difficult to carry out, because they require high-capital cost autoclaves. Atmospheric-pressure

Refractory ore trouble Russian gold miners Mining

28/9/2016· Using Petropavlovsk’s proposed pressure oxidation facility as an example, the company said in 2012 it expected processing costs at its Pioneer mine of US$9.4 per tonne for non-refractory ore and US$12.3 per tonne for refractory ore. The company also budgeted US$500 million for the POX hub’s development. Not using special processing for the complex ore lodes also doesn’t seem viable

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