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Autoclave and Pressure Oxidation | Mining and Minerals ,

Australia English China , Autoclave and Pressure Oxidation 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 ....

High Pressure Acid Leach & Pressure Oxidation

oxidation reaction would generate sufficient heat for the oxidation reaction to proceed to completion Non-acidic pressure oxidation techniques such as alkaline pressure oxidation use similar conditions of temperature, pressure and oxygen to acidic route but the process is ,...

Gold Recovery from Electronic Waste by Pressure Oxidation

oxidative system (Portable autoclave - Ref 1925X All American), where pressure was increased from 0 to 103 kPa and temperature remains constant at 120°C The applied pressure modified the partial pressure of oxygen and increased the oxidative reaction rate [17] With the pressure increase, the reaction time was reduced from 40 to 5 minut...

Pressure Oxidation Overview - ScienceDirect

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...

In-situ Adsorption of Gold(III) Chloride on Activated ,

on Activated Carbon Under Pressure Oxidation-Leaching Conditions , chloride (15x10-4 M Au(III) plus 005 M extra chloride) was allowed to adsorb onto activated carbon (10, 20 and 30 g/L) at pH 15 and at different temperatures (22, 60 and 95 oC) Complete gold removal was achieved within , 33 Autoclave pressure oxidation / carbon ....

US5536297A - Gold recovery from refractory carbonaceous ,

A process for recovering gold in which an ore slurry of refractory sulfidic and refractory carbonaceous ore having preg-robbing characteristics due to the presence of organic carbon is subjected to pressure oxidation in an autoclave The oxidized ore slurry is mixed with a thiosulfate salt lixiviant, which mixture is maintained at a pH between 7 and 87 while the slurry is agitated in a ....

Valves for Autoclave Processes - Mogas

Valves for Autoclave Process Continued research and development programs, solid proven designs and , (Pressure Oxidation) Reliable valve operation is crucial, since these plants are often located close to the ore beds—making travel challenging, should service be required Harsh media and tough operating , Australia 2008 Continued ....

New Developments in the Atmospheric and Pressure ,

New Developments in the Atmospheric and Pressure Leaching of Copper Ores and Concentrates , Ferric provided by pressure oxidation of Pyrite concentrate , under water in a pressure leach autoclave Resource Total Measured Indicated KTons Cu % KTons...

Iodide Pressure Oxidation Gold Leaching - Autoclave

Table of ContentsEffect of stirring speedEffect of temperatureEffect of partial pressure of oxygenEffect of potassium iodide concentrationEffect of pH of iodide solution The pressure oxidation process is especially suitable for the sulfide type of refractory or It includes two stages of operation First, the refractory ore is subjected to an autoclave oxidation...

pressure oxidation plants for gold mining - tetenoviasmx

Valves for gold autoclave pressure oxidation (POX) - Autoclave pressure oxidation (POX) is an effective pre-treatment option when extracting gold from refractory ore bodies, such as pyrite and arsenopyrite While gold processing plants are the most common utilizers of POX technology, the process can also be , Know More ›...

OKTOP® Autoclave plant unit - Outotec

The process is defined as needed and the autoclaves can be used in multiple applications These operations start from relative low pressure anode slime processing, up to high pressure acid leaching with pressures reaching 60 bar In recent years, common autoclave deliveries have been for pressurized oxide leaching applications...

US5489326A - Gold recovery using controlled oxygen ,

A process for recovering gold from a refractory auriferous ore containing sulfide sulfur An aqueous slurry of refractory auriferous ore is subjected to pressure oxidation in an autoclave while the distribution of oxygen to the various compartments of the autoclave is controlled in ,...

pressure oxidation autoclave au - bsnsportactienl

autoclave pressure oxidation gold au grinding mill china technical program c of cim,metallurgy,materials,canada 3 oct 2011 global growth,particularly driven by china,is putting tremendous stress on themill grinding ...

Basic Iron Sulphate in Pressure Oxidation Processing

Typical autoclave operating conditions for a refractory gold process are a temperature of 190 to 230OC, and an oxygen over-pressure of 350 to 700 kPa (50 to 100 psi) The oxidation of sulphides are strongly exothermic reactions, and the pulp density of the feed to the autoclave is calculated based on the sulphide concentration in such a...

Autoclave Standard Operating Procedure - NDSU

• Run the autoclave at a chamber temperature of 121°C for 60 minutes*, using a dry cycle run *121°C is a standard temperature for autoclave operation, and generally achieved when chamber pressure is 15-16 psi However, this pressure is dependent upon altitude At higher altitudes, the pressure must be increased to achieve 121°C...

macraes autoclave gold - entrepreneursconventioncoza

The autoclave is a pressure oxidation vessel used to unlock the refractory gold particles locked within sulphide minerals before the cyanide leaching process begins What would take place over millions of years of natural weathering to break free the gold, occurs within 30 minutes inside the autoclave,...

High Pressure Acid Leach & Pressure Oxidation

oxidation reaction would generate sufficient heat for the oxidation reaction to proceed to completion Non-acidic pressure oxidation techniques such as alkaline pressure oxidation use similar conditions of temperature, pressure and oxygen to acidic route but the process is ,...

What is an Autoclave? - infogunzau

Here comes the Autoclave Like the pressure cooker, an autoclave is a machine that uses the combination of high pressure and steam in order to transfer heat to the items placed inside Invented in 1879 by Charles Chamberland, the first autoclave was essentially a glorified pressure cooker...

Pressure oxidation - Wikipedia

The pressure oxidation process is used to prepare such ores for conventional gold extraction processes such as cyanidation It is performed in an autoclave at high pressure and temperature, where high-purity oxygen mixes with a slurry of ore...

Pieterse Consulting - Home page

Welcome We serve the Mining and Process Industry in the areas of our expertise Our Expertise is in Autoclaving, Pressure Leaching, Pressure Oxidation, Underground Cooling, Process and Plant Design, Project Management and Execution, and Operational Analysis...

Valves for gold autoclave pressure oxidation (POX) -

Autoclave pressure oxidation (POX) is an effective pre-treatment option when extracting gold from refractory ore bodi has wide selection of valves that control various liquid and gaseous flows in gold autoclave POX process...

PRESSURE OXIDATION OF REFRACTORY GOLD ORES , - ,

Pressure Oxidation 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 sulfates) and hematite Depending on the conditions within the autoclave, acid containing iron compounds can be formed...

autoclave pressure oxidation gold au grinding mill china

autoclave pressure oxidation gold au - webshopfotobe autoclave pressure oxidation gold au grinding Carbon Metal Beneficiation Grinding Mill China activated carbon is a chemical element with symbol C and autoclave Contact supplier Related links ...

Alkaline Pressure Oxidation of a Gold- Bearing ,

Alkaline Pressure Oxidation of a Gold- , Aqueous pressure oxidation may provide the best approach for processing refractory , CaCI222Autoclave leaching in this proces is carried out at 100°C ....

Pueblo Viejo – Pressure Oxidation and Air Separation Project

The pressure-oxidation and air-separation-unit process areas were delivered on time and on budget despite that logistical challenges; Managed the transportation and logistics of the large pressure oxidation (autoclave) vessels and oxygen plant equipment, including a 120 km, 18-day, cross-country trek to the mine site...

Stabilization of supersonic vent gas from autoclave ,

STABILIZATION OF SUPERSONIC VENT GAS FROM AUTOCLAVE PRESSURE OXIDATION 79 Introduction This paper presents the results of computational fluid dynamics (CFD) and finite element analyses (FEA) in the design of a novel blast shroud configuration using a perforated plate, as it applies to pressure letdown of vent gas from a pressure oxidation process...

Pressure Oxidation Leaching Process - 911metallurgist

Batch Autoclave Laboratory Procedures: The vessel used for the laboratory pressure oxidation process was a two-liter Parr titanium autoclave with dual impellers It was heated and cooled externally and was pressurized with commercial-grade oxygen A positive bleed of offgas was maintained in each test; the rate was measured in the offgas after the steam was removed with a condenser and desiccant...

ECONOMICS OF REFRACTORY GOLD ORE PROCESSES

ECONOMICS OF REFRACTORY GOLD ORE PROCESSES John E Litz and R Wayne Carter 119th TMS Annual Meeting February 18-22, 1990 , The oxygen pressure oxidation of total ore uses a 40% solids feed and uses heat exchangers on both the flashed slurry and vapor to preheat the autoclave feed prior to oxidation at 200°C for 90 minut Oxygen ....

Thermodynamics and Kinetics of the Dissolution of Gold ,

THERMODYNAMICS AND KINETICS OF THE DISSOLUTION OF GOLD UNDER PRESSURE OXIDATION CONDITIONS 411 C ANADIAN M ETALLURGICAL Q UARTERLY Autoclave Potentiostat N 2, O 2 Au and Pt wires Silver wire Test solution (30ml) KCI solution Fig 1 Experimental set-up for high temperature measurements Fig 2 Calculated equilibrium potentials for the Fe 3+ /Fe ....

Sherritt International - Operations - Commercial and ,

High purity nickel and cobalt powders are produced by the following reactions in high pressure autoclav Ammonium sulphate is produced as a valuable by-product of this process , Kwinana Operations (Australia) Minara Resources, Murrin Murrin HPAL Plant and Metals Refinery (Australia) , Design of the New Lihir Gold Pressure Oxidation Autoclave...