High pressure sulphuric acid leaching of lateritic nickel ore

Üçyıldız, Ayşe; Girgin, İsmail

doi:10.5277/ppmp170137

Cited by 3 publications

(3 citation statements)

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“…In a separate experiment, leaching was carried out at 105 °C for 30 min under overpressure of 0.5 atm: this process presented a simplified model of the industrial nickel recovery at high pressure and temperature [13]. The blank variants were presented as leaching with distilled water or persulfate solution.…”

Section: Methodsmentioning

confidence: 99%

Prevention of sulfuric acid pollution: intensification of metal leaching with organic acids

Абашина

Yachkula

Vainshtein

2022

IOP Conf. Ser.: Earth Environ. Sci.

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Hydrometallurgical mining of valuable and non-ferrous metals is traditionally accompanied by a large-scale pollution of the territories with sulfuric acid. This pollution is the global problem and requires the significant remediation costs. There are known some attempts to replace sulfuric and other strong inorganic acids with organic acids which could be easier utilized under natural conditions. However, this approach proved to be ineffective due to the weak leaching effect of organic acids. In our experiments on chemical leaching, we investigated leaching of nickel from low-grade silicate ores with a mixture of organic acids and persulfate. Organic acids ensured both the acidic reaction of the leaching solution while persulfate provided a short-term formation of persulfuric (peroxysulphuric) acid, which is the stronger leaching agent than sulfuric acid. In whole, experimental results showed that metal leaching can be intensified with application of organic acids.

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Section: Methodsmentioning

confidence: 99%

Prevention of sulfuric acid pollution: intensification of metal leaching with organic acids

Абашина

Yachkula

Vainshtein

2022

IOP Conf. Ser.: Earth Environ. Sci.

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“…Like the recovery of other metals, the leaching method is a proven method capable of leaching metal with nearly perfect effectiveness (Esmaeili et al, 2020;Meshram et al, 2016;Li et al, 2015). So far, the application of this method has been dominated by using inorganic acid solvents such as sulphuric acid (Hosseini et al, 2017;Ucyildiz & Girgin, 2017), hydrochloric acid (Le & Lee, 2010;Oediyani et al, 2019), and nitric acid (Khalid & Athraa, 2017;Ramos-Cano et al, 2016). However, this acid type has its drawbacks, primarily related to the environmental aspects involved (Astuti et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Utilization of the spent catalyst as a raw material for rechargeable battery production: The effect of leaching time, type, and concentration of organic acids

Panggabean

Susanti

Astuti

et al. 2023

Int. J. Renew. Energy Dev.

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This study examines the potential use of the spent catalyst as a raw material for rechargeable batteries. The spent catalyst Ni/γ-Al2O3 still contains relatively high amounts of nickel. This indicates the potential use of the spent catalyst to be leached and purified for synthesizing nickel-based compounds so that it can be applied to rechargeable battery cathodes. In this study, the spent catalyst leaching process employed four types of organic acids: citric acid, lactic acid, oxalic acid, and acetic acid. The spent catalyst was leached under atmospheric conditions and room temperature. Organic acid concentrations were also varied at 0.1, 0.5, 1, and 2 M. The leaching process took place for 240 minutes, where sampling was conducted periodically at 30, 60, 120, 180, and 240 minutes. Experimental results showed that Ni (II) and Al (III) ions were successfully leached to the maximum when using 2M citric acids at a leaching time of 240 minutes. The conditions succeeded in leaching Ni (II) and Al (III) ions of 357.8 and 1,975.4 ppm, respectively. Organic acid, notably citric acid, has excellent potential for further development. Citric acid, as a solvent, has the ability to leach metal ions with high recovery. In addition, this acid is categorized as an eco-friendly and green solvent compared to inorganic acid. Thus, the leaching process can take place without harming the environment.

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“…In the nickel and cobalt industries, laterite ores are widely used as resources for producing intermediate products of mixed nickel and cobalt hydroxide precipitates in the high-pressure acid leaching (HPAL) process . Several researchers reported that recovery of Ni and Co from the HPAL process for nickel laterite ores was 93–97 and 88–96%, respectively. , − The two most popular treatment options for excessive residue are deep-sea tailings landfills and stacking, resulting in resource waste and environmental pollution . The treatment of leaching residue still faces a significant challenge in realizing large-scale resource utilization and circularity.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution and Phase Transformation of Iron Produced from the Sustainable Carbothermic Reduction Process of High-Pressure Acid Leaching Residue

Setiawan,

Harjanto,

Kawigraha

et al. 2023

ACS Omega

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This paper describes the microstructure evolution and phase transformation of residue from the lateritic nickel ore high-pressure acid leaching (HPAL) during carbothermic reduction using palm kernel shell (PKS) charcoal as a reductant. The study consisted of thermodynamic calculations combined with analysis of reduction experiments. The thermodynamic assessment predicted that the main phases formed during the reduction process were γ-Fe metal, liquid metal, slag, and spinel, with abundance of reducing gas (CO and H2) at the temperature range of 750–1500 °C. The experimental study shows that the resulting product upon cooling was sponge iron or direct reduced iron when HPAL residue-PKS charcoal composites were reacted up to 1400 °C for 45 min. The sponge iron had an average apparent density of 5.8 ± 0.1 g/cm3 and a 90.8 ± 0.4% metallization degree. The microstructure analysis revealed that as the reduction time was increased, small iron nuggets began forming on the surface of the reduced product. By addition of Na2CO3, the separation of iron nuggets from slag appeared to be improved, hence enhancing the overall reduction process. Furthermore, iron nuggets’ highest apparent density and metallization degree were obtained at 7 ± 0.1 g/cm3 and 98 ± 0.5%, respectively, when adding Na2CO3 of 6 wt %. The phase and microstructure analyses also revealed that the iron nuggets comprised coarse pearlite, eutectic cementite, ledeburite, and sulfides. Thus, this study offers alternative sustainable process conditions for simultaneously handling the HPAL residue using PKS waste to produce metallic iron.

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High pressure sulphuric acid leaching of lateritic nickel ore

Cited by 3 publications

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Prevention of sulfuric acid pollution: intensification of metal leaching with organic acids

Prevention of sulfuric acid pollution: intensification of metal leaching with organic acids

Utilization of the spent catalyst as a raw material for rechargeable battery production: The effect of leaching time, type, and concentration of organic acids

Microstructure Evolution and Phase Transformation of Iron Produced from the Sustainable Carbothermic Reduction Process of High-Pressure Acid Leaching Residue

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