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Explore the extraction processes of nickel from laterite ore, including acid leaching, smelting, and the Caron process. Discover the Direct Nickel Process DNi, an atmospheric hydrometallurgical processing route that uses nitric acid as the leaching agent and recycles over 95% of it. Learn about the subsequent steps of the process, from comminution to thermal decomposition.
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A kind of leaching residue generated during high pressure acid leaching of laterite nickel ore is creatively prepared as blast furnace charge for ironmaking. Results show that the briquettes with uniform shape, compressive strength higher than 72.3 N/pellet, and cracking temperature over 400 °C can be obtained by the non-binder briquetting with water content of …
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Explore the extraction processes of nickel from laterite ore, including acid leaching, smelting, and the Caron process. Discover the Direct Nickel Process DNi, an atmospheric hydrometallurgical processing route that uses nitric acid …
WhatsApp: +86 18221755073
Nickel, cobalt and iron were extracted from Caldag lateritic nickel ore under atmospheric pressure acidic leaching conditions. The following variables were examined to understand their effects on extraction: sulphuric acid concentration, liquid-to-solid ratio, leaching temperature, leaching time, and particle size.
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The sulfation-roasting-leaching process can be used for processing laterite ore for recovery of Ni and Co. However, the low leaching efficiency of Ni and Co, high sulfuric acid consumption, and the emission of sulfur xide (SO3) gas remain challenges. In this study, an integrated process for the co-roasting of limonitic and saprolitic laterite ore using the sulfation …
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Key words: leaching, nickel, cobalt, hydrometallurgy, laterites. DOI: 10.17580/nfm.2024.01.03 Review on hydrometallurgical processing technology of lateritic nickel ore for the last 20 years in the world Introduction N ickel with its unique properties [1] is a strategic metal for many modern industrial processes —
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Fluidized reduction roasting is an efficient metallurgical technique. However, its application to nickel laterite ore has rarely been reported. In this paper, the effects of reduction temperature, reduction time, CO concentration, and material particle size on the roasting characteristics of ferronickel fluidization reduction were investigated. Combined with X-ray …
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The effects of cations stress of magnesium ion and sodium ion on the low-grade nickel sulfide ore oxidative leaching in simulated sulfuric acid solutions were investigated. This study was performed in two courses, including the effect of the cations on the valuable metals leaching efficiencies of the nickel ore and its influences on the electrochemical oxidation …
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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.
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Based on the mechanism, air roasting and the addition of hydrogen peroxide were adopted to effectively reduce the leaching ratios of impurities such as Fe and Al, and achieved …
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The hydrometallurgical process of nickel laterite leavesa residue that still contains critical metals such as iron and nickel. Its utilization can improve overall process efficiency and reduce environmental damage. In this work, the recovery of nickel and iron from nickel residue resulting from the citric acid leach process has been carried out using the selective reduction …
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Similar leaching circuits are used for leaching metallic and intermediate nickel and cobalt products. The leaching process results in an aqueous nickel and/or cobalt sulfate solution. This solution is further treated through iron, manganese, and other impurity-removal and solvent-extraction stages. The solid residue from the leaching is a
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in Australia, among others. Indeed, most new nickel projects are investigating heap leaching as an option for at least a portion of the production. On the surface, heap leaching of a nickel laterite would not appear to be attractive owing to the low permeability of most nickel laterite ores, coupled with the expected high acid consumption and long
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Leaching temperature, leaching duration, sulfuric acid to ore weight ratio and particle size of the limonitic nickel laterite ore were studied. Optimum parameters determined as 255 o C, 0.30 sulfuric acid to ore weight ratio, a particle size of −850μ, 1 h of leaching duration with 30% w/w. 87.3% of Ni and 88.8% of Co in the ore extracted into the PLS but, …
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High-pressure acid leach (HPAL) residue from laterite nickel ore is a potentially valuable resource for ironmaking; however, its efficient utilization is hindered by its high sulfur content. In this study, an effective and straightforward method is proposed for sulfur removal from HPAL residue. The process involves sieving and sodium carbonate leaching, enabling …
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/g dry ore), leaching temperature (200–240 °C) and leaching time (30–120 minutes) on the high pressure sulphuric acid leaching of a lateritic nickel ore sample having 1.37% Ni, 0.076% Co and 47.72% Fe 2 O 3 were investigated. The
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This paper describes the experimental findings of the extraction of nickel and cobalt by high pressure acid leaching (HPAL) of a refractory limonitic nickel laterite ore from the …
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The leaching kinetics study shows that nickel extraction from limonite ore by a mixture of 2 M sulfuric acid and 0.5 M citric acids is controlled by diffusion through solid product layer, while ...
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The origins of High Pressure Acid Leaching (HPAL) go back almost 70 years, but the technology is becoming increasingly widespread to supply the demand for nickel-based …
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Meanwhile, laterite nickel ore has emerged as an increasingly important source of nickel (Tong et al., ... To study the effect of hydrochloric acid concentration on leaching of nickel, cobalt, manganese and iron, a batch of leaching experiments were conducted in the following conditions: ammonium chloride concentration (3 M), various ...
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For laterite nickel ores, the process starts with crushing and grinding the ore, followed by high-pressure acid leaching (HPAL) to dissolve nickel and cobalt. The solution is then separated from the solid residues, and the nickel is recovered through methods such as hydrogen reduction or electrorefining to achieve high purity.
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Optimum leaching conditions and final liquor composition varies according to the ore mineralogy. More fundamental studies have demonstrated that the rate of leaching and character of the residue is dependent upon the level of Mg, Mn and Cr in the ore, the Eh of the slurry and salinity of the process water.
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In general, the hydrometallurgical process of sulfide ore including the heap leaching 12, acid leaching 13, and ammonia leaching 14,15. However, there are many drawbacks in the treatment of ...
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HPAL (High-Pressure Acid Leaching) is one of the important technologies for extracting nickel and cobalt from nickel laterite ore. In the next few years, some plants using this technology will be …
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In this process, the leaching of a nickel laterite ore generates a pregnant leach solution containing more than 10–30 g/L Fe(III) that is used for the leaching nickel sulphide ore either sequentially or simultaneously. Saprolite ore can then be used for neutralisation of the product liquor and precipitation of iron.
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Several hydrometallurgical methods have been investigated to improve nickel leaching from laterite ores containing low nickel grades, such as high pressure acid leaching …
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Extracting nickel from sulfide ore generally refers to the process of melting nickel from nickel sulfide ore into low-nickel matte or leaching nickel into solution. Its metallurgical technologies are primarily concerned with pyrometallurgy and hydrometallurgy.
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The leaching behavior of nickel and iron in limonite-type laterite nickel ore was studied through ammonium hydrogen sulfate atmospheric leaching. The leaching temperature, ammonium bisulfate concentration, reaction time, and acid excess rate during the nickel dissolution process were optimized using the response surface methodology (RSM) …
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After the OBI Laterite Nickel Ore Project is fully put into operation, it will form a large integrated intelligent manufacturing industrial park with 6 high-pressure acid leaching production lines, 20 RKEF production lines, the refineries of 500,000 tons of battery-grade nickel sulfate and 70,000 tons of cobalt sulfate, the works of 3 million ...
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During leaching of oxidized nickel ore (ONO) to a level of 89% nickel extraction there is a change in the grain size composition of solid residues with an increase in fine phase – 21.5 + 0 mm by a factor of two compared with the original ONO composition, which is connected with "self grinding" of ore during leaching. ...
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