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pressure oxidation refractory

Pressure Oxidation of a Refractory Sulfide

2018-8-11  Pressure oxidation of the refractory sulfide/carbonaceous ores has gained world-wide acceptance. Compared with roasting, pressure oxidation

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Pressure Oxidation Pretreatment of Refractory Gold

1984-2-1  Pressure oxidation of gold containing concentrates and ores is an effective pretreatment for liberating refractory gold. This is particularly true when an appreciable portion

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Oxidation of refractory metals in air and low pressure

2000-1-1  Refractory metal samples were oxidized in ambient air or in a system capable of achieving a base pressure of <10 −7 Pa (5×10 −9 Torr) after bakeout. For the low pressure

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Pressure oxidation overview ScienceDirect

2005-1-1  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,

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Pressure oxidation of double refractory gold bearing

A new technique was developed for quantitative evaluation of oxidized gold in refractory sulphide concentrates. With the help of this technique the authors established that oxidized gold was

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Pressure oxidation of double refractory gold

2013-1-1  Santa Fe Pacific Gold Corp. conducted pressure-oxidation pilot plant studies on refractory carbonaceous gold ores from the Twin Creeks Mine in Nevada. The tests were conducted at Hazen Research

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Pressure Oxidation Process TON Outotec

Gold is efficiently released from the sulfide matrix for the subsequent leaching process, whether cyanidation or chloride leaching. The TON Outotec pressure oxidation main process steps:

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Enhanced Gold Recovery from Alkaline Pressure Oxidized

2022-1-10  Pressure oxidation is a widely accepted method to treat refractory gold ores. Gold recovery is generally lower from alkaline than acidic pressure oxidation discharge due to

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Pressure Oxidation Circuit

2018-1-31  The oxidation circuit consists of one autoclave, two stages of slurry heating, and two stages of flash cooling. The autoclave was designed to operate at 180°C (356°F) with a slurry residence time of 48 minutes. Design criteria

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Pressure oxidation of double refractory gold bearing

A new technique was developed for quantitative evaluation of oxidized gold in refractory sulphide concentrates. With the help of this technique the authors established that oxidized gold was present in many concentrates and in some of them it is the dominant form. This technique can help streamline the extraction of gold from refractory ores

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Pressure oxidation, gold Big Chemical Encyclopedia

Gold extraction from such ores require roasting or pressure oxidation or bacterial oxidation prior to cyanidation to destroy the sulfide structure. Arsenical compounds that can form during pressure-oxidation of refractory gold ores in the autoclaves include Phase-3, Phase-4, Type 2 and Fe0HS04 (Fig. 1). In addition, scorodite can form in

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Pressure Oxidation Overview Request PDF ResearchGate

Gold pressure oxidation was established 32 years ago, with McLaughlin being the first facility in 1985 (Thomas & Pearson, 2016). Pressure oxidation is carried out at elevated temperatures ranging

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PRESSURE OXIDATION OF PYRITE-ARSENOPYRITE

2012-10-4  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

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Gold recovery from refractory gold concentrates by

2019-3-1  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.

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Pressure Oxidation Circuit

2018-1-31  The oxidation circuit consists of one autoclave, two stages of slurry heating, and two stages of flash cooling. The autoclave was designed to operate at 180°C (356°F) with a slurry residence time of 48 minutes. Design criteria

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Surface oxidation mechanism of a refractory high-entropy

2019-5-9  At extremely high temperatures (2000 K) we observe the removal of oxygen atoms with the manipulation of the oxygen pressure. Even at 10 −9 bar, there is still 0.333 ML oxygen coverage on the

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Chemical analyses of concentrate samples

Download scientific diagram Chemical analyses of concentrate samples from publication: Pilot plant pressure oxidation of refractory gold-silver concentrate from Eldorado Gold Corporation's

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An oxidation resistant refractory high entropy alloy

2019-5-13  The most recent study on the oxidation behaviour of AlCrMoTaTi reported by Gorr et al. 14 indicated a mass gain after 48 hours of oxidation at 1000 and 1100 °C was less than 1 and 3 mg/cm 2

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The Leachox™ Refractory Gold Process The Testing,

2021-12-16  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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Refractory Gold Pressure Oxidation Technology at

2020-2-19  The pressure oxidation circuit, based on treating 70 t/d . arsenopyrite-pyrite concentrate in a single autoclave, replaced the roasting circuit in the existing plant. The Pressure Oxidation process provided the following benefits. to the operation: • Eliminated SO2 emissions • Eliminated arsenic trioxide production

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Pressure oxidation of double refractory raw materials in

Pressure oxidation allows to carry out the efficient processing of goldbearing sulfide materials. However, application of this method for processing of double refractory raw materials leads to irreversible gold losses due to autoclave preg-robbing of gold by organic carbon. Thermodynamic and experimental data indicate that almost complete sulfide decomposition leads to a high

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PRESSURE OXIDATION OF PYRITE-ARSENOPYRITE

2012-10-4  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

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Pressure Oxidation SGS South Africa

Pressure oxidation technology is robust and versatile. SGS provides a range of pressure leaching options including: Conventional pressure oxidation operates at temperatures exceeding 200ºC with overpressures of 2,200 kPa or more. Reaction rates are very fast. This technology is well accepted. Activox is a form of pressure oxidation which

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pressure oxidation Archives International Mining

2022-6-7  “Pressure oxidation was selected as the most feasible processing technology for double refractory ores. It is able to achieve gold recoveries of 96% by utilising high temperatures, elevated pressure and oxygen to recover

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Pressure Oxidation Circuit

2018-1-31  The oxidation circuit consists of one autoclave, two stages of slurry heating, and two stages of flash cooling. The autoclave was designed to operate at 180°C (356°F) with a slurry residence time of 48 minutes. Design criteria

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[PDF] BASIC IRON SULPHATE A POTENTIAL KILLER FOR

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 leaching, which expose the gold for subsequent

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Chemical analyses of concentrate samples

Download scientific diagram Chemical analyses of concentrate samples from publication: Pilot plant pressure oxidation of refractory gold-silver concentrate from Eldorado Gold Corporation's

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Ionization selectivity of electrospray and atmospheric

Dissolved organic matter (DOM) in petroleum refinery wastewater is an extremely complex mixture. A better understanding of chemical compositions of DOM at the molecular level is necessary for the design and optimization of wastewater treatment processes. In this study, two largely different DOM samples, one Environmental Science: Processes & Impacts Recent

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A Review on the Research of Hydrometallurgical Leaching

2022-7-12  Pressure oxidation leaching is divided into three leaching methods: low-temperature pressure leaching, medium-temperature pressure leaching, and high-temperature pressure leaching. Hu YT, Guo P, Wang SX, Zhang LB (2020) Leaching kinetics of antimony from refractory gold ore in alkaline sodium sulfide under ultrasound. Chem Eng Res Des 164:

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