Chemical benefication of Rosetta ilmenite by direct reduction leaching

Lasheen, T.A.

doi:10.1016/j.hydromet.2004.10.002

Cited by 58 publications

(42 citation statements)

References 2 publications

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“…Hard iron-titanium particles of about 2 mm were separated with a rotary sieve. These particles were milled in a mechanical agate mortar down to a particle size of \200 mesh [23]. Fe-titania photocatalysts were prepared by milling known amounts of FeTiO 3 and TiO 2 (Degussa P25) during 120 min in a high-speed mechanical agate mortar.…”

Section: Catalysts Preparation and Characterizationmentioning

confidence: 99%

Photocatalytic Degradation of Phenol with Fe-Titania Catalysts

et al. 2011

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Iron titanate (FeTiO 3 ) obtained from rich titanium and iron mineral presented some absorption of UV light and photocatalytic activity for the degradation of phenol in aqueous solution. However, most of the reactant is converted to carboxylic acids that remain in the reaction mixture because natural ilmenite do not produce enough HO • radicals to completely mineralize the original reactant at the same rate as pure titania (Degussa P25). The XRD analysis of Fe-titania catalysts prepared by simple mixing of FeTiO 3 and TiO 2 showed that the structure of TiO 2 is not modified when small amounts of FeTiO 3 , in the order of 10% weight, are well mixed with pure titania. Therefore, the photocatalytic activity of these catalysts is not affected by the presence of FeTiO 3 . But, heavy ilmenite particles induce the separation of the catalysts particles after the photocatalytic degradation processes.

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Section: Catalysts Preparation and Characterizationmentioning

confidence: 99%

Photocatalytic Degradation of Phenol with Fe-Titania Catalysts

et al. 2011

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“…In this process, chlorine in a fluid bed reactor is reacted with the titanium feedstock at 925-1010 o C to give volatile titanium tetrachloride, which is then oxidised by combustion with pure oxygen at 985 o C to form anatase or rutile with the bulk of the chlorine recycled (Lasheen, 2005). The Chloride Process offers several advantages such as the yield of high quality product, a more eco-friendly process and the generation of smaller amount of waste products.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

“…It is also known that the dissolution of ilmenite can be enhanced by adding other metals such as zinc and tin (El-Khaliny, 1967). Mahmoud et al (2004) and Lasheen (2005) have reported reductive leaching of ilmenite ores in hydrochloric acid using metallic iron. These authors indicated that addition of sufficient iron metal during leaching reduces the dissolved iron(III) to iron(II) and some of the dissolved titanium(IV) to titanium(III).…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

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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“…Hydrometallurgical methods, which include leaching of ilmenite with hydrochloric acid (Lanyon et al, 1999;Ogasawara et al, 2000;Lasheen, 2005) or sulfuric acid both under atmospheric or pressure leaching conditions to dissolve iron in order to obtain synthetic rutile or titanium dioxide pigment (Kataoka and Yamada, 1973;Kulling et al, 1979;Toromanoff and Habashi, 1985;Jayasekera et al, 1995;Charnet, 1999).…”

Section: (B)mentioning

confidence: 99%

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

Zhang

Nicol

2009

Hydrometallurgy

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Electrochemical techniques have been used to investigate the reduction and dissolution of two different ilmenite samples in 450 g L -1 sulfuric acid solutions at elevated temperatures. The results have shown that the dissolution rate of ilmenite (FeTiO 3 ) is low at potentials above about 0.3 V at which potentials the dissolution of ilmenite and the reduction of hematite (if present in the ilmenite sample) are the main reactions. At more negative potentials the dissolution of ilmenite increases simultaneously with reduction of ilmenite to trivalent titanium. These observations are consistent with those predicted from thermodynamic data. Hematite has a higher dissolution rate under reductive conditions than ilmenite. Studies of the effect of temperature on the dissolution of ilmenite at low potentials such as 0 V have shown that in the temperature range of 65-95 o C, the activation energy is about 50 kJ mol -1 and this together with the high ratio of the charge passed to metals dissolved suggests that the rate of the non-reductive dissolution reaction is not significant under these conditions.

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Chemical benefication of Rosetta ilmenite by direct reduction leaching

Cited by 58 publications

References 2 publications

Photocatalytic Degradation of Phenol with Fe-Titania Catalysts

Photocatalytic Degradation of Phenol with Fe-Titania Catalysts

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

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

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