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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 …

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nickel ore leaching processing - Webel Mediatronics Limited

of processing of lateritic nickel ores in various leach media. Direct sulphuric acid pressure leaching is the process to recover nickel and cobalt from lateritic ores. 1.Nickel Laterite Processing Nickel Iron Scribd. Acid leaching of nickel laterite ores at atmospheric pressure has been pioneered by …

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Ammonia/nitric Acid Leaching of Copper- Cobalt Oxidized Ore

during the process. This is . Abstract— The alkaline leaching behaviour of rich copper- cobalt oxidised ore from Katanga has been investigated. Copper was leached in ammonia/nitric acid solution at room temperature. The effects of time, ammonia concentration, nitric acid/ ammonia ratio and pH, on the leaching kinetic of copper were investigated.

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Nickel: smelting, producing-Metalpedia

The resultant carbon monoxide is re-circulated and reused through the process. The highly pure nickel produced by this process is known as "carbonyl nickel". Source: Nickel-Wikipedia; Hydrometallurgy of Nickel; The high temperature (~250°C) acid pressure leaching of nickeliferous laterite ore has been practised commercially since the late 1950's.

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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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Atmospheric acid leaching of nickel- copper matte from ...

Atmospheric acid leaching of nickel-copper matte from Impala Platinum Refineries The pre-leach stage in the second process route alternative, described above, is the subject of this study. The study investigates the leaching behaviour of Ni–Cu matte in H2SO4-CuSO4 solution during the repulping stage at Impala Platinum Refinery.

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Acid Leaching of Nickel Laterites with Jarosite Precipitation

Abstract. Alkali addition for iron precipitation, associated with sulfuric acid leaching of nickel laterites, has been considered periodically since the late 1960s, shortly after the development of the jarosite process for iron control in zinc refining.

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The HPAL Process :: Total Materia Article

High-pressure acid leaching (HPAL) is being used for the recovery of nickel from nickel laterite ores, and increasingly atmospheric leaching is also being considered. As mentioned above, major reserves of nickel are contained in laterite ores, which have traditionally been treated by pyrometallurgical methods.

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Direct Nickel Process Breakthrough Technology

The DNi Process is an atmospheric hydrometallurgical processing route designed to treat all types of nickel laterite ores, in a single flow sheet to produce a number of final saleable products. The key to the Process is the use of nitric acid as the leaching agent and the subsequent use of a patented recovery and recycling process returning

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Valves for nickel autoclave high pressure acid leaching ...

Improving reliability with optimal valves for nickel autoclave high-pressure acid leaching Autoclave HPAL is a challenging process requiring the toughest flow control solutions. Temperatures and pressures are extremely high, and acidic media and abrasive solids increase the …

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Acid leaching of nickel from dunite rock

the process of sulphuric acid leaching nickel ores and concentrates. 21~24 Antier 25 proposes sulphuric acid treatment of pulped silicate ores and sts that the filtrate be dried oxidatively rOas to dehydrate the sulphates - ferric sulphate is then insoluble and may be separated by washing. ...

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Leaching Laterites: Two New Processes Make Progress | E & MJ

Direct Nickel Ltd. successfully tested its DNi laterite leaching process in a 1-t/d pilot plant, a section of which is pictured above. The plant used feed from PT Antam's Buli nickel mine in Indonesia, where Direct Nickel is considering building a 10,000-20,000 t/y commercial-scale plant.

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Acid Leaching - Metallurgist & Mineral Processing Engineer

—The leaching that we did at Clifton, for something over 20 years, was the simple process of an acid leach, with iron precipitation, and the wasting of all liquors. The modern leaching which you are about to attempt is something which you have developed and proven to your entire satisfaction and until such time as it is working out ...

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HPAL Process — Precision Valve Engineering

Process Challenges. Slurried, crushed ore from the mine is conveyed to the processing plant to be pressure leached with sulphuric acid. The Pressure Acid Leaching area receives the slurried feed, heats it to 225°C and mixes it with hot concentrated sulphuric acid inside four titanium-lined autoclaves. Nickel and cobalt are leached into the ...

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High Pressure Acid Leach (HPAL) | Glossary | Sumitomo ...

High Pressure Acid Leach (HPAL) HPAL technology enables the recovery of nickel from nickel oxide ores that traditionally were difficult to process. SMM was the first company in the world to apply it successfully on a commercial scale.

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The DNi Process™ | The DNI Process™

The only commercially available, internationally implemented, process which can match the DNi Process™'s flexibility in output is High Pressure Acid Leaching (HPAL) but that process cannot treat both limonite and saprolite in one stream and is incapable of treating the entire saprolite profile – the more saprolite added the less profitable that process is.

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Lateritic nickel ore deposits - Wikipedia

Hydrometallurgical processes include high-pressure acid leach (HPAL) and heap leach, both of which are generally followed by solvent extraction - electrowinning for recovery of nickel. Another hydrometallurgical routes is the Caron process, which consists of roasting followed by ammonia leaching and precipitation as nickel carbonate.

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New reagents selected for nickel extraction

Apr 07, 2015· More information: "Reagent selection for recovery of nickel and cobalt from nitric acid nickel laterite leach solutions by solvent extraction," Minerals Engineering, Volume 77, …

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Leaching - an overview | ScienceDirect Topics

This process of leaching is termed as high-pressure acid-leaching process or HPAL process, which is highly selective to nickel and cobalt. 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.

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The Starved Acid Leaching Technology (Salt ... - SpringerLink

Low grade nickel saprolites are not treated. The Caron process for nickel laterite treatment produces residues that still contain significant quantities of un-leached nickel and cobalt. The Starved Acid Leach Technology (SALT) was developed to recover nickel and cobalt from these lean resources.

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Iron Control in Atmospheric Acid Laterite Leaching

nickel leaching. The combined acid leaching and iron precipitation process involves direct acid leaching of the limonite type of laterite followed by a simultaneous iron precipitation and nickel leaching step. Iron precipitation as jarosite is carried out by using nickel …

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Pressure Leaching of Nickel - Hydrometallurgy: Leaching in ...

If you are referring to laterite Ni-Co leaching, HPAL is a well established process (Moa Bay, Murrin Murrin, Coral Bay, Ambatovy, etc.). It is essentially an acid digestion, but recovery is increased and residence time shortened through the use of high temperatures (255 ° C -270 ° C) which in turn need high pressure (4,000 kPa – 5, 300 kPa). ). These conditions need the titanium lining ...

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HIGH PRESSURE SULPHURIC ACID LEACHING OF LATERITIC …

In high pressure acid leaching processes, lateritic nickel ores are interacted with aqueous sulphuric acid solutions in acid resistant autoclaves at temperatures of 230- 270 °C and under pressures of 3.3-5.5 MPa for 60-180 minutes.

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08. Srecko Stopic

a renewed interest has developed concerning the production of nickel and cobalt by high pressure acid leaching (HPAL) of nickel laterites. More than one third of the world's nickel is nowadays produced from laterite ores (Bergmann, 2003, pp.127-138). Laterites account for two thirds of the world's nickel …

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US3741752A - Acid leaching process for treating high grade ...

Nickel and copper values are separately recovered from coppernickel-sulphide matte by means of a multi-stage acid leach process. The matte is treated in a first leaching stage in which the acid to acid-reactive metals molar ratio and leaching time are controlled to selectively extract the bulk of the nickel values while the copper values remain in the leach residue.

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Pressure Acid Leaching of Nickel Laterites: A Review ...

Oct 03, 2011· 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 …

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Pressure Acid Leaching of Nickel Laterites: A Review

In the conventional acid leaching processes, such as heap leaching and tank leaching, high concentration of acids are used to completely release of nickel and cobalt at reasonable leaching …

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Leaching | technology | Britannica

…process is the ammonia pressure leach, in which nickel is recovered from solution using hydrogen reduction, and the sulfur is recovered as ammonium sulfate for use as fertilizer. In another, the matte may be roasted to produce high-grade nickel oxides; these are subjected to a pressure leach…

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The Direct Nickel Process | Total Materia Blog

Using nitric acid as a leaching agent the direct nickel process can treat all types of nickel ore and produces a single flow sheet for a number of final saleable products. As an atmospheric hydrometallurgical process the direct nickel process has an impressive recycle and return statistic meaning 95%+ of the nitric acid is re-used, therefore ...

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LATERITES – STILL A FRONTIER OF NICKEL PROCESS …

• A number of chloride leaching processes are being developed, but there are no operations as yet. • A nitric acid leaching system is being developed by Direct Nickel, but there is no commercial plant as yet.

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(PDF) Nickel extraction from nickel matte

Nickel extraction from nickel matte ... The natural product for a leaching process is a high grade nickel intermediate either from a direct precipitation process (containing approx. 36% Ni) or via ...

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Acid leaching | industrial process | Britannica

Other articles where Acid leaching is discussed: uranium processing: Leaching: Acid leaching is commonly performed by agitating an ore-leach mixture for 4 to as long as 48 hours at ambient temperature. Except in special circumstances, sulfuric acid is the leachant used; it is supplied in amounts sufficient to obtain a final leach liquor at about…

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Processing mixed nickel‑cobalt hydroxide precipitate by ...

The results of the leaching experiments showed that 97% and 96% of the nickel and cobalt can be dissolved in the leaching step while leaving 92% of the manganese in the residue using 1.0 mol/L sulfuric acid solution at 25 °C, a slurry density of 100 g/L and leaching duration of 2.5 h.

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