Reductive leaching of ilmenite ore in hydrochloric acid for preparation of synthetic rutile

Mahmoud, M. H. H.; Afifi, A.A.I.; Ibrahim, I. A.

doi:10.1016/j.hydromet.2003.08.001

Cited by 124 publications

(93 citation statements)

References 7 publications

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“…The mechanism has generally been attributed to the phase transformation from the ferrous phase to the ferric phases, (Cheng et al, 2004;Fu et al, 2006) which was considered to reduce the leaching rate of ilmenite significantly. (Janssen and Putnis, 2002;Mahmoud et al, 2004;El-Hazek et al, 2007) However, our studies do not support this mechanism. First, hematite, which is the main ferric iron phase that was formed by oxidation roasting at T ≤ 1073 K, has a better solubility in hydrochloric acid than ilmenite.…”

Section: Effect Of Oxidation At T ≤ 1073 Kcontrasting

confidence: 97%

Influence of redox pretreatment on the pulverization of panzhihua ilmenite during hydrochloric acid leaching

et al. 2015

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Section: Effect Of Oxidation At T ≤ 1073 Kcontrasting

confidence: 97%

Influence of redox pretreatment on the pulverization of panzhihua ilmenite during hydrochloric acid leaching

et al. 2015

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“…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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“…Proses sulfat tergolong panjang, mahal dan limbah besi sulfat kurang bernilai ekonomis sehingga perlu diganti dengan pelarut asam lainnya. Salah satu pelarut asam yang dapat menggantikan asam sulfat yaitu asam klorida karena memiliki limbah berupa besi klorida yang lebih bernilai ekonomis (Mahmoud et al, 2004).…”

Section: Pendahuluanunclassified

Optimizing of Tio2 Separation From Bangka Ilmenite by Leaching Process Using HCL

2018

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Separation of titanium dioxide (TiO2) from ilmenite Bangka has been done byleaching processusing HCl. Before the leaching process, ilmenite was roastedat 900oC for pre-oxidation (preliminary - oxidation). Leaching process carried out by variation of HCl concentration and Fe0 reducing agents. While the re-deposition of dissolved Ti4+ ion achieved by hydrolysis - condensation using 2-propanol-H2O solvents. Leaching the pre-oxidazed ilmenite shows the phase change of pseudobrokite (Fe2TiO5) into hematite (Fe2O3) and synthetic rutile (TiO2). Formation of the synthetic rutile was characterized by the loss of intensity of Fe2TiO5 at 26.65º and the increasing intensity of rutile TiO2 at 27.49º.The dissolution rate of both titanium and iron was found to be increased, generally, by increasing acid concentration in case of HCl as well as by increasing ilmenite: Fe0 ratio. Precipitation of the dissolved titania with 2-propanol -H2Oof 8:2(v /v) produced anatase TiO2 due to the hydrolysis and condensation of Ti-tetra isopropoxide complexes.

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Reductive leaching of ilmenite ore in hydrochloric acid for preparation of synthetic rutile

Cited by 124 publications

References 7 publications

Influence of redox pretreatment on the pulverization of panzhihua ilmenite during hydrochloric acid leaching

Influence of redox pretreatment on the pulverization of panzhihua ilmenite during hydrochloric acid leaching

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

Optimizing of Tio2 Separation From Bangka Ilmenite by Leaching Process Using HCL

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