An electrochemical study of the reduction and dissolution of ilmenite in sulfuric acid solutions

Zhang, Suchun; Nicol, M.J.

doi:10.1016/j.hydromet.2009.02.009

Cited by 16 publications

(54 citation statements)

References 21 publications

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“…By comparison, the dissolution rate of titanium with addition of Ti(III) to control the potential at 0.4 V is higher than that with both 20 g.L -1 Fe(II) and SO 2 , which confirms the effect of the solution potential on the leaching kinetics as previously reported by Zhang and Nicol (2009).…”

Section: Leaching With Sosupporting

confidence: 87%

“…Dissolution of ilmenite can be summarised by reaction (1) which implies that a high sulfuric concentration should aid dissolution, which is indeed the case. (Zhang and Nicol, 2009;Lasheen, 2009;Sasikumar et al, 2007;Liang et al, 2005;Welham and Llewellyn, 1998;Grey et al, 1996;Han et al, 1987;Barton and McConnel, 1979;Barksdale, 1966) FeTiO 3 (s) + 2H 2 SO 4 (aq) = TiOSO 4 (s) + FeSO 4 (s) + 2H 2 O (l)…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

“…The presence of a small quantity of titanium(III) ions in solution is assumed to have a role in reducing iron(III) in the ilmenite minerals and thus accelerates the rate of dissolution. A more recent electrochemical study on ilmenite (Zhang and Nicol, 2009) has suggested that reductive dissolution of ilmenite to form iron(II) and titanium(III) is possible and that the rate of dissolution of ilmenite is higher under reducing conditions.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

“…The titanium concentration in the aqueous samples was analysed using spectrophotometry of the titanium(IV)-H 2 O 2 orange complex as described in a previous study (Zhang and Nicol, 2009). In the case of samples containing dissolved SO 2 , adjustments were made to the above procedure in which residual SO 2 was first oxidised by chromium(VI).…”

Section: Chemical Analysesmentioning

confidence: 99%

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Kinetics of the dissolution of ilmenite in sulfuric acid solutions under reducing conditions

Zhang

Nicol

2010

Hydrometallurgy

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Please cite this article as: Zhang, Suchun, Nicol, Michael J., Kinetics of the dissolution of ilmenite in sulfuric acid solutions under reducing conditions, Hydrometallurgy (2010), doi: 10.1016/j.hydromet.2010.03.019 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT ABSTRACTThe kinetics of the dissolution of titanium and iron from an ilmenite sample has been studied in moderately strong sulfuric acid solutions in the absence and presence of reducing agents such as titanium(III) ions and sulfur dioxide. The effects of particle size, temperature, solid/liquid ratio, sulfuric acid concentration and titanium(III) concentration on the kinetics of dissolution have been investigated. The results have shown that both particle size and acid concentration have relatively minor effects on the rate of dissolution of titanium while temperature has a significant effect under the studied conditions.The batch leach kinetics of ilmenite in acid solutions appears to fit a shrinking particle model, while in the presence of a decreasing titanium(III) concentration, the rate of dissolution of titanium can be fitted to a shrinking core model. Mathematical expressions for the batch leaching of the ilmenite have been established. The results suggest that the rate of dissolution of ilmenite in acid solutions is controlled by a slow chemical reaction on the surface of the mineral, while in the presence of a reducing agent such as titanous ions, the dissolution rate of ilmenite is significantly enhanced. The use of SO 2 as a reductant increases the dissolution of titanium only in the presence of ferrous ions. The role of Ti(III) ions and SO 2 during leaching is assumed to involve reduction of the iron(III) component in the mineral by a redox reaction on the surface.

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Section: Leaching With Sosupporting

confidence: 87%

Section: Accepted M Manuscriptmentioning

confidence: 99%

Section: Accepted M Manuscriptmentioning

confidence: 99%

Section: Chemical Analysesmentioning

confidence: 99%

See 2 more Smart Citations

Kinetics of the dissolution of ilmenite in sulfuric acid solutions under reducing conditions

Zhang

Nicol

2010

Hydrometallurgy

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“…The main mineral use to produce a TiO 2 are ilmenite, rutile raw materials and leucoxene [2]. There are so many extracting TiO 2 methods reported by previous researchers such as the template-assisted method [3], electrochemical anodic oxidation method [4], fiber laser ablation [5], modified molten salt process [6,7], hydrothermal treatment [8,9] and etc. In this study, we choose the caustic hydrothermal method as reported by many researchers [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Experimental Analysis of Titanium Dioxide Synthesis from Synthetic Rutile Waste using a Moderate Acid Concentration and Temperature

et al. 2017

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The present study is to clarify the present influences of acid concentration and temperature of caustic hydrothermal method on extracting the titanium dioxide (TiO2) from synthetic rutile waste. In this experimental work, the caustic hydrothermal method comprises two processes: a decomposition and the sulphate process. The extracted titanium is characterized by using a electron dispersive X-ray spectroscopy to specify its chemical composition, field emission scanning electron microscope to determine the morphology and particle size, and lastly it is the X-ray diffraction to analyse the crystallinity of extracted titanium. In this study, we found that both acid concentration and temperature affected the TiO2 growth while the calcination process could improve the crystallinity of extracted titanium.

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Extraction behaviours of titanium and other impurities in the decomposition process of ilmenite by highly concentrated KOH solution

Liu

et al. 2012

Int J Miner Metall Mater

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To effectively utilize ilmenite and recycle KOH solution, the extraction behaviours of titanium and other associated impurities in the decomposition process of ilmenite by highly concentrated KOH solution were studied. Experiments on the extraction behaviours of titanium as well as other associated impurities of ilmenite such as iron, silicon, calcium, and aluminium were carried out. The effects of various parameters, including reaction temperature, KOH concentration, reaction time, alkali-to-ore mass ratio, and particle size on the extraction rate of titanium and other impurities were examined. When the finely ground ore (58-75 µm) reacted with KOH solution (80wt%) in an alkali-to-ore mass ratio of 7:1 at 260°C for 60 min, almost complete extraction of titanium was achieved, while the extraction rate of aluminium was 78% and that of other impurities was less than 22%. Moreover, high purity (98.2wt%) TiO 2 with the anatase structure could be gained in the purification process.

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An electrochemical study of the reduction and dissolution of ilmenite in sulfuric acid solutions

Cited by 16 publications

References 21 publications

Kinetics of the dissolution of ilmenite in sulfuric acid solutions under reducing conditions

Kinetics of the dissolution of ilmenite in sulfuric acid solutions under reducing conditions

Experimental Analysis of Titanium Dioxide Synthesis from Synthetic Rutile Waste using a Moderate Acid Concentration and Temperature

Extraction behaviours of titanium and other impurities in the decomposition process of ilmenite by highly concentrated KOH solution

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