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NICKEL LATERITES. General processes of chemical weathering Effects in ultramafic rocks Leaching of mobile constituents: alkalis, alkaline earths Breakdown of olivine, pyroxene, serpentine and leaching of Mg, Ni, Mn, Co Formation of stable secondary ... • …
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The mining of laterites is basically an earth-moving operation, with large shovels, draglines, or front-end loaders extracting the nickel-rich strata and discarding large boulders and waste material. The ore is loaded into trucks at the face, as would be the case in an open pit, and hauled to the smelter.
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Dec 30, 2020· On the other hand, ore mining and stockpiling of the Ni laterites may increase the porosity of soils which can lead to higher infiltration fluxes in stockpile zones. Fig. 11 displays Cr(VI) fluxes as a function of infiltration rate measured from the Rio Tuba Ni laterites and area-normalized discharge estimated from the surrounding surface waters.
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Sep 20, 2013· concentrations, mining of these metallurgically complex deposits can be challenging. Deposits range in size from 2.5 to about 400 million tonnes, with Ni and Co grades ... Nickel-cobalt laterites: a deposit model: Chapter H in Mineral deposit models for resource assessment: DOI: 10.3133/sir20105070H: Authors:
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Nov 15, 2022· The mining industry is therefore seeking alternative processes to cope with both continuous depletion of high-grade sulfide ore reserves and tightening environmental regulations. ... Nickel laterites currently contribute 20–30% of total global supply of cobalt. This metal is mostly obtained as a co-product of copper and nickel sulfide ore ...
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Nickel is most widely used in the production of stainless steel. Traditionally, nickel has been processed from sulfide ores in an approach similar to copper processing, in which the ore is upgraded to concentrates and then smelted. As sulfide ore resources dwindle, however, processing of lateritic nickel ores is becoming of greater necessity, with many …
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Two hydrometallurgical methods have been developed to extract nickel and cobalt from nickel laterites, these processes are called sulphuric acid leaching and reduction roast-ammonia leaching. For high-magnesium silicates in lower profiles laterites the exploitation method used is smelting. ... Sumitomo Metal Mining Co. (SMM), which operates ...
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Nickel laterites are a very important type of nickel ore deposit. They are growing to become the most important source of nickel metal for world demand (currently second to sulfide nickel ore deposits ). Nickel laterites are generally mined via open cut mining methods. Nickel is extracted from the ore by a variety of process routes.
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Mar 29, 2021· Abstract Nickel is mostly extracted from sulfide ores, however, laterite ores account for over 60 pct of all nickel resources in the world, and despite its predominance, there is no well-established process to extract nickel from such ores. Nickel in laterites is hosted in many different compounds such as oxides, hydroxides, and silicates minerals. …
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