The kinetics of the sulphuric acid leaching of nickel and magnesium from reduction roasted serpentine

Apostolidis, C.; Distin, P.A.

doi:10.1016/0304-386x(78)90019-1

Cited by 48 publications

(18 citation statements)

References 4 publications

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“…Leaching of reduced ore, the extraction of nickel was faster and reached about half of the total nickel extracted only in 5 min with increasing leaching time, afterwards. The results are similar with the works by Clarkson et al 14) and Apostolidis et al 15) that the reduction of nickel form oxide brings into rapid leaching of nickel from nickel ore.…”

Section: Effect Of Reduction Treatmentsupporting

confidence: 91%

Recovery of Nickel from Selectively Reduced Laterite Ore by Sulphuric Acid Leaching.

et al. 2003

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The laterite ore with low nickel content deposits in Indonesia can be expected to be an alternative raw material of iron making due to its high iron content. One of the required processes is the separation of nickel and cobalt from the laterite ore by leaching it with H 2 SO 4 at the atmospheric condition. The sample containing 50.88 % iron, 0.03 % cobalt and 0.30 % nickel was selectively reduced with CO/CO 2 mixed gas to obtain metallic nickel and cobalt, as well as magnetite from hematite. Accordingly, in the leaching process metallic nickel and cobalt will be dissolved by controlling the iron dissolving. The effects of various parameters have been examined. These condition include leaching time, temperature (303-343 K), H 2 SO 4 concentration (0.005-1.0) mol/l, as well as extraction rate of nickel.The result of the analysis indicated that the influence of selective reduction could speed up the nickel extraction and obstructed the iron dissolution. The extraction rate of nickel was very high for small particle and slower for larger size. The optimal condition of the test was obtained at the leaching temperature of 343 K, 0.05 mol/l H 2 SO 4 with a sample lower than 4.0 g/l. In 60 min after the test, about 93 mass% of nickel was extracted from the sample smaller than 44 mm. The nickel extraction would be higher by adding the leaching time. The rate of extraction was chemically controlled and the apparent activation energy was 42.2 kJ/mol. At the end of the leaching process, there was residual solid rich-magnetite and minimal nickel.

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Section: Effect Of Reduction Treatmentsupporting

confidence: 91%

Recovery of Nickel from Selectively Reduced Laterite Ore by Sulphuric Acid Leaching.

et al. 2003

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“…Serpentines are minerals derived from the surrounding ophiolites (Fig. ); they are either formed during serpentinization on the deep‐sea floor through hydrothermal alteration of mafic and ultramafic rocks prior to their uplift to form the island of Sulawesi or, in the case of lizardite, occur as a secondary mineral provided by chemical weathering in the saprolite zone (Apostolidis & Distin, ). Another potential source of Mg could be chlorites, detected in small amounts in the serpentinized peridotites to the north of Lake Towuti.…”

Section: Discussionmentioning

confidence: 99%

Modern sedimentation processes in Lake Towuti, Indonesia, revealed by the composition of surface sediments

et al. 2018

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Lake Towuti on Sulawesi Island, Indonesia, is located within the heart of the Indo‐Pacific Warm Pool. This tropical lake is surrounded by ultramafic (ophiolitic) rocks and lateritic soils that create a unique ferruginous depositional setting. In order to understand modern sediment deposition in Lake Towuti, a set of 84 lake surface sediment samples was collected from across the entirety of the lake and samples were analyzed for their physical, chemical, mineralogical and biological constituents. End‐member analyses were carried out to elucidate modern sediment origin, transport and depositional processes. This study found that allochthonous sediment, characterized by the concentrations of the elements Mg, Fe, Si and Al, as well as the clay and serpentine minerals, is dominated by fluvial supply from five distinct source areas. Granulometric data and the occurrence of organic matter of a terrestrial origin suggest that, in the southern and north‐eastern parts of the lake the near‐shore sediments may additionally be influenced by mass wasting. This is due at least partly to the particularly steep slopes in these areas. Furthermore, sediment composition suggests that sediment transport into deeper parts of the lake, particularly in the northern basin, is partly controlled by gravitational and density‐driven processes such as turbidity currents. Directional sediment transport by persistent lake currents, in contrast, appears to be less important. Organic matter deposition in the ultra‐oligotrophic lake, albeit limited, is dominated by autochthonous production, but with some contribution of fluvial and gravitational supply. Biogenic silica deposition, primarily from diatom frustules and sponge spicules, is very limited and is concentrated in only a few areas close to the shoreline that are characterized by shallow waters, but away from the areas of high suspension loads at the mouths of the major inlets. The results of this study build upon current and published work on short piston cores from Lake Towuti. Conversely, the results will support the interpretation of the depositional history and past climatic and environmental conditions derived from the composition of much longer records, which were obtained by the Towuti Drilling Project in May 2015 and are currently under investigation.

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“…There have been several studies on the dissolution mechanisms and kinetics of Mg from serpentine in acid solutions, but most of them involved the pre-treatment of the mineral, which affected the dissolution of the Mg. [15][16][17] Teir et al have recently reported that the dissolution kinetics of Mg from natural serpentine in acids follows a shrinking unreacted-core model with product layer diffusion as the rate-determining step. 18) In that study, the serpentine particles were assumed to be spherical in shape, 18) but serpentine is known to have a layered crystal structures formed by the alternate stacking of the tetrahedral silica and octahedral brucite layers.…”

Section: Introductionmentioning

confidence: 99%

Dissolution of Magnesium from Serpentine Mineral in Sulfuric Acid Solution

Yoo

Kim

et al. 2009

Mater. Trans.

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As the volume of CO 2 , one of greenhouse gases linked to global warming, in the atmosphere increases, there has been an increasing interest in CO 2 sequestration. Aqueous carbonation, which involves the extraction of Mg from serpentine minerals and the subsequent carbonation reaction with CO 2 to form the geologically stable mineral MgCO 3 , has been proposed as a promising CO 2 sequestration technology. This study investigates the dissolution of Mg from serpentine mineral in H 2 SO 4 solution. The study is part of a major research project aimed at developing an effective CO 2 sequestration technology using the serpentine mineral which is readily available in Korea. Complete dissolution of Mg from natural serpentine was achieved in 30 min at a temperature of 90 C under 0.5 M H 2 SO 4 . The rate of dissolution of Mg was independent of the agitation speed at speeds above 300 rpm. The fraction of Mg dissolved from milled serpentine was found to be a little higher than that from natural serpentine up to 70 C in 0.5 M H 2 SO 4 . The Jander equation was used to explain the dissolution rate data. The rate of Mg dissolution seemed to be limited by diffusion through the thin channels formed between the silica layers in the serpentine particles.

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The kinetics of the sulphuric acid leaching of nickel and magnesium from reduction roasted serpentine

Cited by 48 publications

References 4 publications

Recovery of Nickel from Selectively Reduced Laterite Ore by Sulphuric Acid Leaching.

Recovery of Nickel from Selectively Reduced Laterite Ore by Sulphuric Acid Leaching.

Modern sedimentation processes in Lake Towuti, Indonesia, revealed by the composition of surface sediments

Dissolution of Magnesium from Serpentine Mineral in Sulfuric Acid Solution

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