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high pressure oxidation of refractory gold minerals

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.

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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.

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(PDF) Pressure oxidation of double refractory gold

The pressure oxidation approach that allows obtaining high gold recovery from double refractory materials was proposed. $/7$ : The chemical compositions of the concentrates

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PRESSURE OXIDATION OF PYRITE-ARSENOPYRITE

refractoriness is due to encapsulation of the gold particles inside the host mineral. To liberate gold for leaching the host mineral must be broken by mechanical or chemical means. The aim of this study was to study the effect of temperature, oxygen partial pressure and slurry density on pressure oxidation of pyrite-arsenopyrite gold concentrate.

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high pressure oxidation of refractory gold minerals in japan

high pressure oxidation of refractory gold minerals MC World. high pressure oxidation of refractory gold minerals Pressure Oxidation POX is a process used to extract gold copper zinc molybdenum and uranium from refractory ore bodies The POX process utilizes elevated temperatures .

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Pressure oxidation of pyrite-arsenopyrite refractory gold

High pyrite oxidation yields are expected to occur in autoclaves at much higher temperatures (e.g.,190-to 230-°C), as routinely observed in the pre-treatment of refractory gold ores (Rusanen

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Developments in the pretreatment of refractory gold

The high-pressure nitric acid oxidation process is shown in Figure 1. LI, D.-X. Developments on the pretreatment of refractory gold minerals by nitric acid. World Gold Conference 2009,The Southern African Institute of Mining and Metallurgy, 2009. Developments in the pretreatment of refractory gold minerals by nitric acid D.-X. LI

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Sun High Pressure Oxidation Of Refractory Gold Minerals

Sun High Pressure Oxidation Of Refractory Gold Minerals. Biooxidation Biooxidation uses sulfur consuming bacteria in a water solution to remove sulfur Pressure oxidation Utilizes oxygen and heat under pressure in a liquid medium to effect oxidation of sulfur by way of a controlled chemical reaction High pressure autoclaves

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A FUNDAMENTAL STUDY OF THE ACIDIC PRESSURE

2.3 Pretreatment of Refractory Sulfidic Gold Ores 15 2.3.1 Pressure Oxidation 18 2.4 Acidic Pressure Oxidation of Iron and Arsenic Sulfide Minerals 29 References 38 CHAPTER 3 FUNDAMENTALS OF OXIDATION 45 3.1 Thermodynamics 45 3.2 Kinetic Considerations 59 3.2.1 Kinetic Model 64 References 72 CHAPTER 4 EXPERIMENTAL PROGRAM 75 4.1 Materials 75

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The Leachox™ Refractory Gold Process The Testing, Design

Oxidation . ABSTRACT . The Leachox refractory gold process has to date been applied to the selectivetreatment of several refractory gold ores but on a relatively small scale. In this paper the successful implementation of the process, from initial testing through to commissioning at one of the world’s largest refractory gold mines is described.

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Pressure oxidation of pyrite-arsenopyrite refractory gold

High pyrite oxidation yields are expected to occur in autoclaves at much higher temperatures (e.g.,190-to 230-°C), as routinely observed in the pre-treatment of refractory gold ores (Rusanen

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high pressure oxidation of refractory gold minerals in japan

high pressure oxidation of refractory gold minerals MC World. high pressure oxidation of refractory gold minerals Pressure Oxidation POX is a process used to extract gold copper zinc molybdenum and uranium from refractory ore bodies The POX process utilizes elevated temperatures .

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[PDF] OXIDATION OF REFRACTORY GOLD CONCENTRATES

Jan 01, 2004· The alkaline oxidation of refractory gold concentrates containing arsenopyrite and pyrite at ambient temperatures and pressures has been found to be accompanied by the simultaneous dissolution of gold without the addition of cyanide. A detailed study has been made of the kinetics of the oxidation of the pure minerals and of several concentrates.

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the gold strike pressure oxidation plant process

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

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How to Improve the Refractory Gold Leaching Process? Xinhai

The alkaline hot-pressure oxidation is only suitable for refractory gold deposits with high carbonate content and low sulfide content (20%). The acidic hot-pressure oxidation means that the pyrite, arsenopyrite and other sulfides react with the oxygen in an acidic medium under the high temperature and high pressure.

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SGS MINERALS SERVICES T3 SGS 174 09-2013

SGS MINERALS SERVICES T3 SGS 174 3 PRESSURE OXIDATION FOR GOLD When direct treatment with a cyanide solution results in low gold extraction, the ore is termed “refractory”. Gold encapsulated in a sulphide matrix can be readily recovered after a destructive oxidation treatment. After leaching and neutralization, cyanidation or CIL can

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:: Maelgwyn Minerals’ Leachox Refractory Gold Process hits

To compare process routes and recoveries, pressure oxidation can completely breakdown the sulphides and then achieve high gold recoveries, maybe greater than 95%. Where as with the Leachox process and the partial oxidation, depending on the nature of the mineralogy, recoveries in the range 80% to 90% can be expected.

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A FUNDAMENTAL STUDY OF THE ACIDIC PRESSURE

2.3 Pretreatment of Refractory Sulfidic Gold Ores 15 2.3.1 Pressure Oxidation 18 2.4 Acidic Pressure Oxidation of Iron and Arsenic Sulfide Minerals 29 References 38 CHAPTER 3 FUNDAMENTALS OF OXIDATION 45 3.1 Thermodynamics 45 3.2 Kinetic Considerations 59 3.2.1 Kinetic Model 64 References 72 CHAPTER 4 EXPERIMENTAL PROGRAM 75 4.1 Materials 75

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Basic Iron Sulphate in Pressure Oxidation Processing

impervious sulphide mineral matrix, and is termed refractory. The most common refractory gold sulphide hosts are arsenopyrite and pyrite, and in order to achieve acceptable gold recoveries, it is generally necessary to break down the host mineral chemically. This is done by roasting, bacterial oxidation or pressure oxidation

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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.

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Pressure Oxidation Caldera Engineering

Pressure Oxidation (POX) is a process used to extract gold, copper, zinc, molybdenum, and uranium from refractory ore bodies. The POX process utilizes elevated temperatures (roughly 230 degrees Celsius), elevated pressures (roughly 35 bar or 510 psi), and oxygen to liberate the minerals from refractory

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Treatment of carbonaceous refractory gold ores ScienceDirect

Jan 01, 1991· Refractory ore treatment by this method normally gives gold extraction in excess of 95%. Autoclave leaching of refractory gold ores on an industrial scale started in the 1980's because of the high gold price and because pressure oxidation is an environmentally accepted alternative to roasting.

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An acidic pressure oxidation pre-treatment of refractory

Roasting is the only commercialised process in Zimbabwe for the pre-treatment of refractory gold feedstocks for the subsequent cyanidation leaching. This process results in only about 75% gold recovery and is characterised by high gold values in the residue. A pressure oxidation process in an autoclave has been evaluated as an alternative. The process resulted in substantially higher gold

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Refractory ore trouble Russian gold miners Mining South

Sep 28, 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.

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