pressure oxidation of sulphides
pressure oxidation of sulphides

Pressure oxidation

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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...

high pressure oxidation of refractory gold minerals

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An acidic pressure oxidation pre-treatment of refractory gold concentrates from the 75 gold recovery and is characterised by high gold values in the residue pressure, particle size and matrix of the sulphide host minerals is described...

gold sulfide ore oxidation

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Gold Sulphide Ore Oxidation by Alkaline Pressure - 911 Metallurgist Oct 20, 2017 The US Bureau of Mines developed an alkaline oxidative pretreatment to increase the recovery of gold from refractory sulfide ores containing Contact Us Bacterial heap leaching of refractory gold/sulphide ores...

Method and system for pressure oxidation of sulfide gold ,

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May 28, 2002 0183 32 Pressure oxidation is one pretreatment technique in which the ore and/or concentrate, is contacted with oxygen gas in an autoclave under high pressure to oxidize sulfide sulfur in the sulfide minerals thereby releasing gold for recovery...

Pressure Oxidation Process

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OutotecĀ® Pressure Oxidation Process Get a comprehensive solution for refractory gold sulfide oxidation from one reliable supplier The Outotec pressure oxidation process solution offers a sustainable and economical process in a complete pressure oxidation plant with a high level of automation and process control...

Pyrophoric Control

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The oxidation of the sulphide anion by the oxygen in the air releases a tremendous amount of heat The amount of heat can be enough to make the iron deposits glow red While the iron itself cannot catch fire, if there is a fuel source present eg, residual oils, hydrocarbon gases , the heat created is adequate to ignite the fuel source, and ....

Thermodynamics and Kinetics of Sulfide Oxidation by Oxygen ,

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Apr 09, 2011 0183 32 Sulfide oxidation kinetics of aerobic chemolithotrophic symbionts and free-living assemblag , Data for the chemolithotrophic oxidation of H 2 S with O 2 in high-pressure incubation chambers by free-living microbial communities 40 mL volume recovered from hydrothermal diffuse flows...

Biological Leaching

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The process consisted of biological leaching to partially oxidise sulphides, followed by pressure leaching for complete sulphide oxidation and arsenic precipitation, followed by liquor neutralisation and...

Materials Selection for Sulfide Pressure Oxidation Autoclaves

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Nb-55 Ti, selected for its corrosion resistance, mechanical properties and reduced pyrophoricity compared to standard titanium alloys, has been successfully used in sulfide pressure oxidation ,...

Leaching of Copper Sulphides

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worth noting, firstly the acid generated in the oxidation of the sulphides in the concentrate pressure leaching step and that produced in the extraction of copper from the pregnant leach solution PLS is...

ECONOMICS OF REFRACTORY GOLD ORE PROCESSES

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80 sulfide oxidation is suitable for good liberation of the gold and that oxygen utilization greater than 5 is difficult to achieve The oxygen pressure oxidation of ,...

PRESSURE OXIDATION PROCESS

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Apr 25, 1972 0183 32 A process for pressure oxidation of a metal-sulfide compound selected from the group consisting of molybdenum sulfide, vanadium sulfide, tungsten sulfide, tin sulfide, antimony sulfide and the alkali metal salts thereof which comprises subjecting a water solution or a water slurry of said metal sulfide compound to a temperature of from about 60 ....

MEASUREMENT OF REACTION ENTHALPY DURING ,

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A calorimetric method for determining the enthalpy of the aqueous oxidation of sulfide minerals at high temperatures and oxygen pressures has been developed and evaluated under conditions relevant to industrial pressure oxidation operations...

Autoclave and Pressure Oxidation Mining and Minerals ,

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Pressure oxidation was developed for processing refractory ores where gold is occluded in the sulfide minerals, typically pyrite or arsenopyrite Oxidation of the sulfides at elevated temperatures and pressures liberates the gold, allowing it to be economically recovered by conventional circuits...

High Pressure Acid Leach Pressure Oxidation

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It is well know that sulphide minerals decompose rapidly in acidic media under conditions of elevated pressure and temperature using oxygen as the principal oxidation agent...

Powder Metallurgy Mining

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NSC Hydrometallurgical Pressure Oxidation of Combined Copper and Molybdenum Concentrates Corby G Anderson 1 , Todd S Fayram2 and Larry G Twidwell3 , oxidation of sulfide to sulfate can be achieved without the excessive conditions found in other pressure leach systems Thus, the rapid...

PRESSURE OXIDATION OF PYRITE

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Pressure oxidation is typically operated in temperatures of 190 to 230 176 C and oxy- gen overpressure of 350 to 700 kPa Fleming 2010 Under these conditions sulfide...

Pressure oxidation overview

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Pressure oxidation refers to the oxidation of sulfides, such as pyrite FeS 2 and marcasite FeS 2 , at elevated temperature and pressure Oxidation releases encapsulated gold grains from the sulfides and makes the oxidation residue of the ore or concentrate more amenable for gold recovery by cyanidation in a subsequent leaching step...

A FUNDAMENTAL STUDY OF THE ACIDIC PRESSURE ,

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During the acidic pressure oxidation of orpiment, most of the arsenic was found to be in the trivalent state after 2 hours oxidation at temperatures ranging from 170 to 230 176 C, and subsequent oxidation to As V with oxygen was very slow...

Overview Energy Requirements for the Pressure Oxidation of ,

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Overview Energy Requirements for the Pressure Oxidation of Gold-Bearing Sulfides PGMason A variety of feed materials may be sub 173 jected to pressure oxidation of their sulfide...

Autoclave Technology

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Solutions Every autoclave and preleach circuit is a custom design, based on the experience and expertise of the design team With the right innovative and proprietary equipment designs, your pressure-oxidation needs can be effectively met...

The Application and Economic Consideration of NSC Pressure ,

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Consideration of NSC Pressure Oxidation To Combined Copper and Molybdenum Concentrates Dr Corby G Anderson Mr Todd Fayram Dr Larry Twidwell Hydroprocessing of Sulphides ,...

Effect of Various Ions, pH, and Osmotic Pressure on ,

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Apr 28, 1999 0183 32 The oxidation of elemental sulfur by Thiobacillus thiooxidans was studied at pH 23, 45, and 70 in the presence of different concentrations of various anions sulfate, phosphate, chloride, nitrate, and fluoride and cations potassium, sodium, lithium, rubidium, and cesium The results agree with ....

Pressure Oxidation Circuit

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Initial speculation was that partial oxidation of the sulfides was the cause of the oxygen depletion Further investigations showed that the lack of oxygen was due more to the specific mineralogy of the sulfide ores than to the partial oxidation...

Removal of Hydrogen Sulphide from Water

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amnesia, loss of consciousness, delirium, hallucinations, difficulty in swallowing, low blood pressure, slowing of heart rate, double vision and epileptiform convulsions Hydrogen sulphide in blood is , The turbidity resulted from the oxidation of hydrogen sulphide to elemental Sulphur S 0 The removal...

Electrochemical Oxidation of Hydrogen Sulfide in Polluted ,

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oxidation of sulfide ions in chloride brines in an autoclave under high temperature and pressure The X-ray photoelectron spectroscopy XPS and Energy Dispersive Spectroscopy EDS proved that sulfur was identified as the final reaction product under various potentials and temperatur...

PRESSURE OXIDATION OF REFRACTORY GOLD ORES THE ,

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Pressure oxidation is employed to liberate gold and silver in refractory sulfide concentrates often and or The main pressure oxidation products from iron sulfide minerals are sulfuric acid and metal...

Basic Iron Sulphate in Pressure Oxidation Processing

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Iron sulphide minerals break down completely during pressure oxidation, and dissolve in the sulphuric acid solution that is generated from oxidation of the sulphid This ,...

Measurement of reaction enthalpy during pressure oxidation ,

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Read Measurement of reaction enthalpy during pressure oxidation of sulphide minerals, Journal of Thermal Analysis and Calorimetry on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips...

Fundamental study of silver deportment during the pressure ,

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Silver sulphide reacts during the pressure oxidation and silver is released into the solution Under the deoxygenated condition, aqueous silver can precipitate as silver sulphide However, the presence of oxygen minimises this reaction and any silver sulphide precipitated is oxidised back to aqueous silver...