• Atmospheric acid leaching of nickel laterites review: Part

    Atmospheric acid leaching of nickel laterites review: Part

    Mar 01, 2008 The process was acknowledged to be robust and resulted in leach extractions of 87% nickel and 88% cobalt for a sulphuric acid addition of 600 kg/t dry ore. A method referred to as sulphuric acid acidolysis and water leaching (SAWL) ( Xu et al., 2005 ) combines elements of several of the inventions described above

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  • High Pressure Acid Leach - Caldera Engineering

    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

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  • BioHeap - A Bioleaching Process for Nickel Extraction

    BioHeap - A Bioleaching Process for Nickel Extraction

    Aug 26, 2002 Although both bacterial oxidation and non-bacterial heap leaching are established in the gold and copper industries, their combined use in nickel extraction is unique. The BioHeap process treats crushed ore, so avoiding the need for fine grinding and concentration steps usually needed for most bacterial oxidation techniques

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  • Nickel extraction from low grade laterite by agitation

    Nickel extraction from low grade laterite by agitation

    Jul 01, 2014 The typical AL leaching process involves direct leaching of nickel laterite ores with both inorganic and/or organic acids by either agitation or heap leaching. In this process metals within the ore are liberated in the acidic environment, then the metal rich leach solution selectively precipitated for metal recovery by various methods including

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  • Why heap leach nickel laterites?

    Why heap leach nickel laterites?

    Nickel Laterite Heap leaching is simple and flexible, and can be applied to the many laterite deposits that currently have no realistic path to production. This paper aims to review the current state of nickel laterite processing and aims to show that heap leaching of nickel laterites is a viable and economically attractive alternative

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  • A promising selective recovery process of valuable metals

    A promising selective recovery process of valuable metals

    Jan 15, 2021 Hence, it could be inferred from the calculation results that the ammonia leaching process was a typical feature of chemically controlled process for nickel and cobalt (Ning et al., 2019). The leaching rate of nickel and cobalt were greatly affected by temperature and the increasing of temperature facilitated the solid-liquid transfer rate of

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  • Nickel Matte Sulphate Leaching Process - Metso Outotec

    Nickel Matte Sulphate Leaching Process - Metso Outotec

    The Outotec Nickel Matte Sulphate Leaching Process offers a proven processing method for various nickel containing raw materials. Outotec's industry leading sulphate-based pressure leaching is the key to the process to guarantee high recoveries of nickel, cobalt and precious metals

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  • Selective leaching of nickel from prereduced limonitic

    Selective leaching of nickel from prereduced limonitic

    uncompromised nickel recovery, improved nickel leaching selectivity, and improved overall iron control. The approach that was selected was to use the reduction roasting step as in the Caron process, but with the difference that the produced calcine would serve as the feed in HPAL. The expectation was that reduction roasting would make nickel

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  • CN1312867A - Method for removing sulfur in nickel leaching

    CN1312867A - Method for removing sulfur in nickel leaching

    The present invention relates to a method for the removal of sulfur from the leaching cycle of nickel processes such as leaching of nickel matte. According to the method, anolyte generated in nickel electrowinning is neutralized with the aid of a calcium-based neutralizing agent, wherein sulfur is removed from the leaching cycle as gypsum

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  • The Caron Process :: Total Materia Article

    The Caron Process :: Total Materia Article

    In general, nickel can be extracted from its ores using smelting, high pressure acid leaching (HPAL) and Caron roast/leach processes. The Caron process, which involves reduction roasting of the ore followed by ammonia leaching of reduced ore, is one of the ways in which nickel laterite can be treated

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  • Atmospheric pressure leaching of nickel from a low-grade

    Atmospheric pressure leaching of nickel from a low-grade

    Nickel was uniformly distributed in iron (hydr)oxide minerals. The pre-concentration of nickel was attempted by magnetic separation, but was unsuccessful. The effect of the type of lixiviant, acid concentration, S/L ratio, time, and temperature were investigated in the atmospheric leaching process

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  • The HPAL Process :: Total Materia Article

    The HPAL Process :: Total Materia Article

    As mentioned above, major reserves of nickel are contained in laterite ores, which have traditionally been treated by pyrometallurgical methods. Hydrometallurgical treatment, by direct acid leaching of the ore at temperatures above 240 C, is however an alternative treatment option for several new projects

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  • Study of Nickel Leaching Using Sulfuric Acid and

    Study of Nickel Leaching Using Sulfuric Acid and

    Study of nickel leaching using sulfuric acid and phosphoric acid on the selectivity of low-grade laterite nickel ore under atmospheric conditions has been successfully carried out. In this study, the laterite nickel leaching process was carried out by varying the solution concentration and operating time. The concentrations of sulfuric acid and phosphoric acid solutions were varied at 5 M and 6 M

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

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

    Currently, two nitric-based processes are actively moving ahead: a tank-leach method developed by Direct Nickel Ltd. (DNi) with research assistance from Australia’s CSIRO; and a heap-leach approach developed by GME Resources, a Perth, Australia-based nickel exploration company, which, through its subsidiary NiWest Ltd., owns a large nickel laterite deposit at Murrin Murrin in Western Australia

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