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Atmospheric acid leaching of nickel laterites review:

2008-3-1  The operating costs for sulphuric acid leaching processes for nickel laterite ores are strongly impacted by the acid requirements. It is important here to distinguish between acid consumption during leaching and acid utilised which also includes the amount neutralised before nickel and cobalt recovery.

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ACID LEACHING PROCESS FOR TREATING HIGH

The residue containing copper values and a minor portion of the nickel values is then acid leached in one or more stages to substantially completely extract copper values and the residual nickel values. Precious metal contained in the matte are concentrated in the residue from the secondary leaching stages.

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Atmospheric acid leaching of nickel laterites review:

This review examines the atmospheric leaching (AL) of nickel laterite ores with sulphuric acid, specifically the limonite, smectite (clay) and saprolite fractions. The kinetics and mechanism of leaching of the key minerals are reviewed together with methods for enhancing nickel recovery. Existing and developing AL processes for extracting nickel ...

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

2018-6-10  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.

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Atmospheric pressure leaching of nickel from a low-grade ...

2018-6-27  2Fe3+ + 3H2O = Fe2O3 + 6H+ (4) Nickel is also released in the solutions during acid leaching of the calcine from reduction roasting and iron dissolution by equation (1). The dissolved ferrous iron is oxidized to ferric iron (Eq. 2), which immediately undergoes hydrolytic reactions (3) and (4) (i.e. the conversion of soluble iron to insoluble FeOOH and Fe2O3). The acid consumed by the leaching of

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Nickel Heap Leaching - Brazilian Nickel PLC

In the heap leaching process, very dilute sulphuric acid (similar in strength to some acid‐based household cleaning products) is slowly applied to crushed nickel ore on a lined pad to dissolve the nickel and cobalt contained in the rock in a several month

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Selective Nickel Leaching from Nickel and Cobalt Mixed ...

nickel leaching processes, including: 1) chlorine leaching by chlorine gas; and 2) pressure leaching by oxygen gas. (1) Chlorine leaching is a well-known selective nickel leaching process with high e・

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Kinetics of nickel leaching from roasting-dissolving

2009-5-27  Abstract: Sulfuric acid leaching process was applied to extract nickel from roasting-dissolving residue of a spent catalyst, the effect of different parameters on nickel extraction was investigated by leaching experiments, and the leaching kinetics of nickel was

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Efficient and selective recovery of Ni, Cu, and Co from ...

2017-3-9  By introducing an acid pre-leaching process into the oxidative ammonia leaching process, we achieved the high extraction efficiencies of 98.03%, 99.13%, and 85.60% for the valuable metals Ni, Cu, and Co, respectively, from the low-nickel matte. Download to read the full article text

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Acid leaching of nickel from dunite rock

2021-3-21  lead. Pawel 31 proposed hydrochloric acid leaching of an oxidized low grade nickel ore followed by neutralization of the nickel/magnesium/iron chloride liquor with magnesium oxide. After sel iron and nickel as hydroxides solution is filtered, evaporat to regenerate hydrogen chloride Hydrochloric acid has also found some ion of the chloride

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Acid Leaching of Nickel Laterites with Jarosite ...

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. In the late 1990’s a series of flowsheets were proposed and tested involving simultaneous atmospheric ...

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

2009-8-26  Conventionally, two process routes are employed for leaching Ni-Cu matte. The first one involves both atmospheric and pressure leaching in acidic copper–nickel sulphate solution, with oxygen being the oxidizing agent. In this process the matte is first leached under atmospheric conditions followed by a pressure leach step, and in both steps O2/air is

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Acid leaching of nickel from serpentinic laterite ores ...

U.S. Pat. No. 3,793,432 teaches the sulphuric acid leaching of iron-rich nickeliferous lateritic or similar nickel-bearing ores at a pH below 1.5 and simultaneously adding alkaline iron-precipitating agents. The process is carried out at atmospheric pressures, thereby avoiding the use of costly autoclaves.

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Selective Nickel Leaching from Nickel and Cobalt Mixed ...

The mechanism of nickel leaching from MS using sulfuric acid was identified. It was shown that nickel-selective leaching using sulfuric acid is difficult because of the formation of elemental sulfur and NiS 2 precipitates on the MS surface that interfere with the leaching reaction. [doi:10.2320/matertrans.M2018080]

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Kinetics of nickel leaching from roasting-dissolving

2009-5-27  In the study on a spent nickel oxide catalyst leaching with sulfuric acid, MULAK et al also observed similar behavior of stirring speed on the leaching kinetics. This indicates that the external diffusion of H2SO4 and NiSO4 between the fluid and the surface of particles is fast, and hence does not control the dissolution of nickel within the investigated range of stirring speed. All subsequent

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Selective leaching of nickel from prereduced limonitic ...

2016-10-31  meet during AL process development have been high acid consumption, selective leaching, iron control and acceptable nickel recovery. Generally, under AL conditions, nickel is more difficult to leach from limonite than from smectite (clay) and saprolite ores [3]. To achieve high nickel extraction, often high acid consumption is required, as

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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

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Direct Nickel Process – Breakthrough Technology

Direct Nickel Process. Strictly Confidential HPAL • HIGH PRESSURE ACID LEACHING • Sulphuric Acid • 260°C • 600kPa • Output: MHP, NiS, Ni Metal, Co • LOCATIONS • Murrin Murrin • Ravensthorpe • Ambatovy • Goro • Ramu River • Coral Bay/Taganito 11 NiSO

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Efficient and selective recovery of Ni, Cu, and Co from ...

2017-3-9  By introducing an acid pre-leaching process into the oxidative ammonia leaching process, we achieved the high extraction efficiencies of 98.03%, 99.13%, and 85.60% for the valuable metals Ni, Cu, and Co, respectively, from the low-nickel matte. Download to read the full article text

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

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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Kinetics of nickel leaching from roasting-dissolving

2009-5-27  Abstract: Sulfuric acid leaching process was applied to extract nickel from roasting-dissolving residue of a spent catalyst, the effect of different parameters on nickel extraction was investigated by leaching experiments, and the leaching kinetics of nickel was

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Selective leaching of nickel from prereduced limonitic ...

2016-10-31  meet during AL process development have been high acid consumption, selective leaching, iron control and acceptable nickel recovery. Generally, under AL conditions, nickel is more difficult to leach from limonite than from smectite (clay) and saprolite ores [3]. To achieve high nickel extraction, often high acid consumption is required, as

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Selective Nickel Leaching from Nickel and Cobalt

The process uses sulfuric acid, which does not require high-cost facilities. However, selective nickel leaching from MS, which was the process development goal, could not be achieved. This result is quite different from the case of selective Zn leaching from ZnS. The mechanism of nickel leaching from MS using sulfuric acid was identified.

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Computer modeling of high-pressure leaching process of ...

2013-10-14  In the high-pressure sulfuric acid leaching (HPSAL) process for nickel laterite in “Rudjinci” ore in Serbia, the temperature, the sulfuric acid to ore ratio, the stirring speed, and the leaching time as the predictor variables, and the degree of nickel extraction as the response have been considered.

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Effect of Key Parameters on the Selective Acid Leach of ...

2019-10-9  nickel to its trivalent state can be largely prevented while oxidation of the cobalt and manganese proceeds quickly. By controlling the acid addition, the leaching of divalent nickel and other impurities can be controlled [5]. Figure 1. Process flow diagram for the selective acid leach process to refine mixed Ni-Co hydroxide

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Direct Nickel Process – Breakthrough Technology

Direct Nickel Process. Strictly Confidential HPAL • HIGH PRESSURE ACID LEACHING • Sulphuric Acid • 260°C • 600kPa • Output: MHP, NiS, Ni Metal, Co • LOCATIONS • Murrin Murrin • Ravensthorpe • Ambatovy • Goro • Ramu River • Coral Bay/Taganito 11 NiSO

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Taguchi Optimization for Nickel Cobalt Extraction Process ...

2018-1-9  The process of separation of nickel from other impurities can be done by sulfuric acid leaching method and Hydrochloric acid leaching and extraction system. The study design was prepared using the Taguchi-Larger the Better Method. Characterization of laterite nickel raw materials using X-Ray Diffraction (XRD), ...

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Evaluation of shrinking core model in leaching

In this study, commonly used internal diffusion controlled shrinking core model was evaluated for leaching process of Pomalaa nickel laterite using citric acid as leachant. Particle size was varied at 60-70, 100-120, -200 meshes, while the operating temperature was kept constant at 358 K, citric acid concentration at 0.1 M, pulp density at 20% w/v and the leaching time was for 120 minutes.

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Nickel / cobalt mining extraction procedures

The PAL metallurgical process involves preheating the ore and leaching with concentrated sulfuric acid at high temperatures and pressures. The chemical species of nickel and cobalt by hydrometallurgical chemical process are soluble sulfate salts, which are recovered from dissolution in a countercurrent decanting circuit (CCD). CCD involves washing the residue and recovering soluble nickel and cobalt. The remaining acid

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

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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Pressure acid leaching of nickel laterite - UBC Library ...

Pressure acid leaching is an acceptable process for the treatment of nickel laterites. This process offers many advantages such as low energy consumption, low capital cost and high nickel and cobalt recoveries. The dissolution process is coupled to selective thermal hydrolysis of iron and aluminum. The dissolution of laterite and precipitation of iron and aluminum are strongly dependent on the ...

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Selective Nickel Leaching from Nickel and Cobalt

The process uses sulfuric acid, which does not require high-cost facilities. However, selective nickel leaching from MS, which was the process development goal, could not be achieved. This result is quite different from the case of selective Zn leaching from ZnS. The mechanism of nickel leaching from MS using sulfuric acid was identified.

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Selective leaching of nickel from prereduced limonitic ...

2016-10-31  meet during AL process development have been high acid consumption, selective leaching, iron control and acceptable nickel recovery. Generally, under AL conditions, nickel is more difficult to leach from limonite than from smectite (clay) and saprolite ores [3]. To achieve high nickel extraction, often high acid consumption is required, as

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Effect of Key Parameters on the Selective Acid Leach of ...

2019-10-9  nickel to its trivalent state can be largely prevented while oxidation of the cobalt and manganese proceeds quickly. By controlling the acid addition, the leaching of divalent nickel and other impurities can be controlled [5]. Figure 1. Process flow diagram for the selective acid leach process to refine mixed Ni-Co hydroxide

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Leaching kinetics of spent nickel–cadmium battery in ...

Abstract Acid leaching process for recovering nickel and cadmium from spent Ni–Cd batteries consumes concentrated acid solution and operate at quite high temperature. The present paper reports improved nickel and cadmium recoveries in sulphuric acid leaching of Ni–Cd battery powder at relatively lower temperatures. The spent Ni–Cd battery powder containing about 69% Ni, 15% Cd and 0.94% ...

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KINETIC MODELS OF NICKEL LATERITE ORE

The subject of this study is leaching process of nickel-bearing laterite ore from Ržanovo, R. Macedonia. The influence of sulfuric acid concentration (0.5, 1 and 3 M H2SO4) on the extracted Ni (%, wt.) was studied. The leaching process intensified by magnetic stirring at different temperatures (298, 323, 348 and 363 K) in the time interval of 120 min. was performed.

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Extraction of valuable metals from low nickel matte by ...

A calcified roasting-acid leaching process was developed as a highly effective method for the extraction of valuable metals from low nickel matte in the presence of CaO additive. The influences of process parameters on the metal extraction were studied, including the ...

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Direct Nickel Process – Breakthrough Technology

Direct Nickel Process. Strictly Confidential HPAL • HIGH PRESSURE ACID LEACHING • Sulphuric Acid • 260°C • 600kPa • Output: MHP, NiS, Ni Metal, Co • LOCATIONS • Murrin Murrin • Ravensthorpe • Ambatovy • Goro • Ramu River • Coral Bay/Taganito 11 NiSO

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Taguchi Optimization for Nickel Cobalt Extraction Process ...

2018-1-9  The process of separation of nickel from other impurities can be done by sulfuric acid leaching method and Hydrochloric acid leaching and extraction system. The study design was prepared using the Taguchi-Larger the Better Method. Characterization of laterite nickel raw materials using X-Ray Diffraction (XRD), ...

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