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pressure leaching process

PRESSURE LEACHING

earliest, most successful pressure leaching flowsheets which is still in operation today: the Fort Saskatchewan plant was constructed in 1954, primarily to process complex copper-nickel-cobalt ores. The process consists of a series of pressure leach vessels to oxidatively leach nickel and copper in an ammonium lixiviant.

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Pressure leaching BioMineWiki

Pressure leaching is the chemical dissolution of soluble minerals within a solid ore or concentrate carried out at elevated pressures and giving rise to a solution containing metals to be recovered. The process is carried out in closed autoclaves which permit higher temperatures (>220°C) and pressures (>20 atm) than are possible with open tanks.

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Pressure leaching industrial process Britannica

Other articles where Pressure leaching is discussed: metallurgy: Leaching: Pressure leaching shortens the treatment time by improving the solubility of solids that dissolve only very slowly at atmospheric pressure. For this process autoclaves are used, in both vertical and horizontal styles. After leaching, the pregnant solution is separated from the insoluble residue and sent

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Pressure leaching and oxidation Hatch Ltd

Pressure leaching and pressure oxidation are hydrometallurgical processes applied to the extraction of many metals.The processes occur above atmospheric boiling temperature, require a sealed reactor vessel, and often operate in highly corrosive and oxidizing environments.

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Study on the improvement of the zinc pressure leaching process

Aug 01, 2020· In pressure leaching process, the particle size of the raw material significantly affects the extraction efficiency by influencing the specific surface area of solid (m 2 /g). Therefore, the particle size of the raw material, as a key factor, needs to be investigated in pressure leaching process.

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Pressure Oxidation Leaching Process

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

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SGS MINERALS SERVICES T3 SGS 174 09-2013

ores, but pressure leaching is a common starting point. Low pressure Activox Process MIM/Mt. Albion Process Medium pressure Dynatec Process Anglo American/UBC Process Oxiana/Mt. Gordon Process High Pressure Phelps Dodge-Placer Dome Process PLATSOL Process SGS has had experience with all the pressure leaching processes that have

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Leaching an overview ScienceDirect Topics

A pressure leaching autoclave is used in this process that receives the hot feed slurry through positive displacement slurry pump and maintains the slurry residence time between one and two hours. Pressure leaching autoclave operates at 6 bar above the vapor pressure of the slurry by means of air addition and kept in steady-state operation

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HIGH PRESSURE ACID LEACHING

methods of recovery, such as traditional leaching, have been outmoded. In the last decade, high pressure acid leaching (HPAL) in autoclaves has become the technologically preferred method for processing gold present in sulfide minerals. AL autoclaving entails subjecting the acidic ore to temperatures up to HP

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Pressure Leaching of Copper Concentrates

19 October 25th, 2004 Phelps Dodge Copper Pressure Leaching Developments Phelps Dodge (& Placer Dome) have developed a suite of proprietary processes, including: High temperature process (HT) Converts essentially all sulfide sulfur to acid Maximizes acid production

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Pressure Oxidation Leaching Process

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

More

SGS MINERALS SERVICES T3 SGS 174 09-2013

ores, but pressure leaching is a common starting point. Low pressure Activox Process MIM/Mt. Albion Process Medium pressure Dynatec Process Anglo American/UBC Process Oxiana/Mt. Gordon Process High Pressure Phelps Dodge-Placer Dome Process PLATSOL Process SGS has had experience with all the pressure leaching processes that have

More

HIGH PRESSURE ACID LEACHING

methods of recovery, such as traditional leaching, have been outmoded. In the last decade, high pressure acid leaching (HPAL) in autoclaves has become the technologically preferred method for processing gold present in sulfide minerals. AL autoclaving entails subjecting the acidic ore to temperatures up to HP

More

Pressure Leaching of Copper Concentrates

19 October 25th, 2004 Phelps Dodge Copper Pressure Leaching Developments Phelps Dodge (& Placer Dome) have developed a suite of proprietary processes, including: High temperature process (HT) Converts essentially all sulfide sulfur to acid Maximizes acid production

More

PRESSURE LEACHING OF DECOPPERIZED COPPER

Pressure leaching of decopperized copper electrorefining anode slimes in strong acid 467 leaching was conducted for two hours thereafter the autoclave was cooled down to the room temperature and the leach residue were removed for filtration and washing.

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Dissolution Behaviors of Trace Muscovite during Pressure

In the conventional process of oxygen pressure acid leaching of quartz ore, purification of quartz sand depends on acid attack to mica minerals, resulting in high acid consumption and a long leaching time [].The two problems lead to significant decreases in equipment life and production efficiency, and an obvious increase in production costs.

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(PDF) Applications of NSC Pressure Leaching

Sep 15, 2008· On an industrial scale, the Sunshine mine in Idaho operated a nitric-sulfuric acid based pressure leaching (NSC) process on Cu-Ag concentrates, which transformed galena into

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Optimisation of Circuits for Pressure Leaching of Sulfide

In the pressure leaching process, sulfide ores and concentrates are leached in autoclaves at temperatures of 200 to 220°C and a pressure of about 3000 kPa (Schlesinger et al., 2011). An oxidising agent, usually oxygen, is required to oxidise sulfide ions to sulfate ions. The oxidation of sulfur to

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The HPAL Process :: Total Materia Article

At this temperature, equilibrium vapor pressure reaches 33-35 atm. Typical operating parameters for autoclave leaching are: pulp density of 25-35% solids, 30-90 minutes residence time, 246°C to 270°C, 200-520 kg/t of acid consumption per dry ore and 3800-5400 kPa pressure.

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PLATSOL Mining SGS

PLATSOL™ is a high temperature chloride-assisted pressure leaching process developed at SGS. Read more It is particularly suitable for orebodies that have a wide variety of pay metals, especially PGM, gold and base metals.

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Leaching of Copper Sulphides SAIMM

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 available for use in a copper heap leaching unit process. In this way, an acid credit to the operating cost is derived (Dreisinger, 2006).

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Integration of Sherritt Zinc Pressure Leach Process at

The third commercial application of the Sherritt Zinc Pressure Leach Process commenced operation at the Ruhr-Zink refinery in March 1991. Integration of pressure leaching with the existing roast-leach-electrowinning facility has increased zinc production capacity by at least 50 000 tonnes per year slab zinc.

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US4606763A Process for the pressure oxidation acid

A process for the pressure oxidation leaching of non-ferrous metal sulphidic material which comprises providing an autoclave assembly which has a series of successive compartments, the first compartment of which being substantially larger in size than each of the remaining compartments. An oxygen partial pressure is provided in the autoclave assembly in the range of from about 50 to about 2000

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