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the leaching process pressure

  • Pressure leaching BioMineWiki Skellefte229;

    Pressure leaching. 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 (gt;220176;C) and pressures (gt;20 atm)

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  • Pressure and Ambient Leaching Mining SGS

    Mining Pressure and Ambient Leaching SGS is a world leader in hydrometallurgical testing and flowsheet development. Our team of metallurgists, chemists and

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  • Valves for nickel autoclave high pressure acid leaching

    Autoclaves are used in mining and minerals processing to extract metals from refractory ore bodies. A typical process for autoclaves is high pressure acid leaching (HPAL), which is often used to extract nickel from laterite ore bodies, but it can also be applied in copper and cobalt production.

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  • Process Development sherritt

    Leaching of nickel copper matte and recovery of platinum group metals Sherritts matte leach process uses sulphuric acid leaching in a combination of atmospheric and/or pressure leaching steps to quantitatively dissolve nickel and copper in nickel copper matte and produce a high grade platinum group metal (PGM) concentrate for refining.

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  • US7416711B2 Atmospheric pressure leach process for

    The present invention resides in a process for the atmospheric pressure acid leaching of laterite ores to recover nickel and cobalt products. More specifically the invention resides in the sequential and joint acid leaching of laterite ore fractions to recover nickel and cobalt and discard the iron residue material, substantially free of the iron rich jarosite solid, eg NaFe 3 (SO 4) 2 (OH) 6.

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  • Iron Control in Zinc Pressure Leach Processes tms

    The integration of Dynatec's zinc pressure leach process with existing roast leach electrowin plants employing various methods of iron rejection is briefly described in this article, along with the application of two stage pressure leaching in stand alone processes. INTRODUCTION .

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  • Pyrite Leaching Behaviour under CESL Process Conditions

    the roles of particle size, oxygen partial pressure, pulp density and copper (Cu) addition on the kinetics of pyrite leaching. The present work focuses more on the stoichiometry of the pyrite leaching reaction under conditions specific to CESLs mixed sulphate chloride system operating at 150186;C.

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  • Pressure Acid Leaching of Nickel Laterites A Review

    acid leaching process. Previous reviews of the pressure acid leaching process have examined the technology of the laterite processing (e.g. Anthony and Flett, 1997). In this review, we examine the technology and chemistry of relevance to the pressure acid leaching of nickel from laterite ores, with a particular emphasis on the new Australian

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  • High pressure acid leaching of a refractory lateritic

    High pressure acid leaching experiments were conducted in a Parr 4532 model, 2 l, titanium grade 4 autoclave which was equipped with automatic heating and cooling units, and

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  • HPAL Process Precision Valve Engineering

    Process Challenges. The Pressure Acid Leaching area receives the slurried feed, heats it to 225176;C and mixes it with hot concentrated sulphuric acid inside four titanium lined autoclaves. Nickel and cobalt are leached into the solution. The autoclaves are served by large preheating and pressure let down systems.

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  • Acid Pressure Leaching of Nickeliferous Laterite Ore

    The first commercial operation to utilize sulfuric acid pressure leaching to process nickeliferous laterite ore was Sulfurs Moa Bay plant in Cuba. The Cuban government expropriated this plant in 1960 shortly after startup. The ore contained about 48% Fe, 5% Al, 4% SiO2, 1.4% Ni, and less than 1% Mg.

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  • Development of a Combined Flotation and High Pressure

    to be further processed by leaching. High pressure leaching presents a better op tion as it is operationally economic. In the leaching process, metals from the flo tation concentrates are enriched into a pregnant leached solution with aid of ac id reagent. It is therefore important that mineral interactions at flotation and

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  • Pyrite Leaching Behaviour under CESL Process Conditions

    the roles of particle size, oxygen partial pressure, pulp density and copper (Cu) addition on the kinetics of pyrite leaching. The present work focuses more on the stoichiometry of the pyrite leaching reaction under conditions specific to CESLs mixed sulphate chloride system operating at 150186;C.

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  • Valves for autoclaves high pressure acid leaching (HPAL)

    Another typical process where autoclaves are utilized is in pressure oxidation (POx). POx is usually used in the recovery of gold from refractory ores. Figure 2 shows the typical temperature and pressure ranges for HPAL and POx. High pressure acid leaching (HPAL) 35 65 Min Pressure (Bar) Max Pressure (Bar) 200 275

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  • New Developments in the Atmospheric and Pressure

    New Developments in the Atmospheric and Pressure Leaching of Copper Ores and Concentrates Copper extraction in pressure leaching 99.0% Overall copper recovery 98.0% Operating temperature 225 C (235 C max.) Economic credit for acid is applied to concentrate leaching process this is essential for economic viability Marsden et al .

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  • Pressure Acid Leaching of Nickel Laterites A Review

    Download Citation on ResearchGate Pressure Acid Leaching of Nickel Laterites A Review A review of the literature over the past 30 years on the processing of nickel laterites by high

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  • Leaching Definition amp; Process Video amp; Lesson Transcript

    Leaching is a process of extracting a substance from a solid material that is dissolved in a liquid. This process is commonly referred to as extraction, particularly in the chemical industry.

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  • High Pressure Acid Leach Caldera Engineering

    Overview. High Pressure Acid Leach (HPAL) is a process used to extract nickel and cobalt from laterite ore bodies. The HPAL process utilizes elevated temperatures (roughly 255 degrees Celsius), elevated pressures (roughly 50 bar or 725 psi), and sulfuric acid to separate nickel and cobalt from the laterite ore. HPAL has been used

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  • Atmospheric pressure leaching application for the recovery

    stringent environmental controls (Dreisinger, 2009). Although high pressure leaching presents lower energy demands as compared to pyrometallurgy, an effective process that can extract metals from low grade ores and tailings at atmospheric pressure is required (Xie et al., 2005).

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  • Copper Ore Hydrometallurgy and Pressure Leaching Copper

    Pressure leaching is specially targeting at treating complex raw ore, reducing its environment impact, producing elemental S instead of sulfuric acid, and adapting to various natural environment condition. Specially, it is possible to extract copper from low grade oxidized ores or complex ores. Process

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  • Extraction of vanadium from black shale using pressure

    The extraction of vanadium from black shale was attempted using pressure acid leaching. The effects of the several parameters which included reaction time, concentration of sulfuric acid, leaching

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  • High pressure acid leaching of a refractory lateritic

    High pressure acid leaching experiments were conducted in a Parr 4532 model, 2 l, titanium grade 4 autoclave which was equipped with automatic heating and cooling units, and

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  • Copper Pressure Leaching Process Outotec

    Outotec174; Copper Pressure Leaching Process. Get sustainable and economical copper recovery from copper sulfides with very high copper leach extractions. The Outotec copper pressure leaching process combines our highly effective pressure oxidation and leaching technology with world renowned VSF solvent extraction and electrowinning technology.

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  • Leaching

    Leaching is the loss or extraction of certain materials from a carrier into a liquid (usually, but not always a solvent). and may refer to . Leaching (agriculture), the loss of water soluble plant nutrients from the soil; or applying a small amount of excess irrigation to avoid soil salinity Leaching (chemistry), the process of extracting substances from a solid by dissolving them in a liquid

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  • Pressure Oxidation Process Outotec

    Outotec can provide a complete pressure oxidation plant including all auxiliary processes for refractory gold sulfide oxidation. Gold is efficiently released from the sulfide matrix for the subsequent leaching process, whether cyanidation or chloride leaching.

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  • New Technology for Recovery of Gold and Silver by

    4 New Technology for Recovery of Gold and Silver by Pressure Cyanidation Leaching and Electrocoagulation Jos233; R. Parga 1, Jes250;s L. Valenzuela 2 and Jos233; A. D237;az 1 1Department of Metallurgy and Materials Science Institute Technology of Saltillo, Saltillo Coahuila

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  • High Pressure Leaching Hazen Research

    High Pressure Leaching. Some leaching operations require elevated temperatures and pressures to achieve the desired extraction. Examples of this include pressure oxidation (POX) of sulfide ores and concentrates, high pressure acid leaching (HPAL) of nickel laterites, and wet air oxidation of organics.

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  • Pressure Oxidation Leaching Process 911metallurgist

    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.

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  • Valves for autoclaves high pressure acid leaching (HPAL)

    Another typical process where autoclaves are utilized is in pressure oxidation (POx). POx is usually used in the recovery of gold from refractory ores. Figure 2 shows the typical temperature and pressure ranges for HPAL and POx. High pressure acid leaching (HPAL) 35 65 Min Pressure (Bar) Max Pressure (Bar) 200 275

    Online Chat
  • US7416711B2 Atmospheric pressure leach process for

    The present invention resides in a process for the atmospheric pressure acid leaching of laterite ores to recover nickel and cobalt products. More specifically the invention resides in the sequential and joint acid leaching of laterite ore fractions to recover nickel and cobalt and discard the iron residue material, substantially free of the iron rich jarosite solid, eg NaFe 3 (SO 4) 2 (OH) 6.

    Online Chat
  • New Technology for Recovery of Gold and Silver by

    4 New Technology for Recovery of Gold and Silver by Pressure Cyanidation Leaching and Electrocoagulation Jos233; R. Parga 1, Jes250;s L. Valenzuela 2 and Jos233; A. D237;az 1 1Department of Metallurgy and Materials Science Institute Technology of Saltillo, Saltillo Coahuila

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  • US20080271571A1 Process for Leaching Lateritic Ore at

    An atmospheric leaching process in the recovery of nickel and cobalt from a lateritic ore, the lateritic ore including a low magnesium ore fraction and a high magnesium ore fraction, the process including the steps of (a) forming an aqueous pulp of the lateritic ore, (b) leaching the aqueous pulp with a concentrated mineral acid at atmospheric pressure to produce a slutty containing a

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  • Leaching (metallurgy)

    Chemistry. Leaching is done in long pressure vessels which are cylindrical (horizontal or vertical) or of horizontal tube form known as autoclaves. A good example of the autoclave leach process can also be found in the metallurgy of zinc. This reaction proceeds at temperatures above the boiling point of water, thus creating a vapor pressure inside

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  • Pressure Acid Leaching of Nickel Laterites A Review

    Mar 26, 20080183;32;Abstract A review of the literature over the past 30 years on the processing of nickel laterites by high temperature acid leaching has been carried out to provide a better understanding of the mineralogy, leaching process chemistry and effect of operating conditions on nickel recovery, residue properties and scaling. Particular attention is paid to the leaching experience of the commercial Moa

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  • Zinc Pressure Leaching (ZPL) Zinc Metalcess

    Zinc pressure leaching (ZPL) treats zinc concentrate directly in the autoclave where specific temperature and oxygen partial pressure is given to leach zinc and generates zinc sulfate solution while sulfur, lead and iron remain in the residue (leaching residue).

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  • Pressure Leaching of Copper Concentrates Metallurgium

    19 October 25th, 2004 Phelps Dodge Copper Pressure Leaching Developments Phelps Dodge (amp; 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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  • Leaching an overview ScienceDirect Topics

    In this case, the leaching process was exothermic and leaching efficiency of molybdenum decreased with increasing solid to liquid ratio. For large scale leaching of spent catalyst, under optimum conditions (20% pulp density, 85 g/L Na 2 CO 3, 10 vol.% H 2 O 2, and 1 h reaction), it was possible to recover 84%

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  • Pressure leaching industrial process Britannica

    In 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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