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Dephosphorization of oxidized iron ore from Gara Djebilet, Tindouf (Algeria)

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Category: Solid-state physics, mineral processing

Last Updated on 17 November 2017

Published on 17 November 2017

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Authors:

S.Badjoudj, Badji Mokhtar University, Annaba, Algeria, e-mail: ecoteam15@yahoo.fr

A.Idres, Dr. Sc. (Tech.), Badji Mokhtar University, Annaba, Algeria.

A.Benselhoub, PhD, Badji Mokhtar University, Annaba, Algeria.

M.Bounouala, Dr. Sc. (Tech.), Badji Mokhtar University, Annaba, Algeria.

Abstract:

Purpose. The study of this scientific work concerns the treatment of the oolitic iron ore deposit of Gara Djebilet, Tindouf, Algeria. Chemical and mineralogical analyzes performed on the representative sample taken from the studied area show high presence of phosphorus oxide P₂O₅. This negatively affects the quality of iron and steel products. Quality improvement and reducing the content of impurities in the studied iron ore were the main objectives of the present research study.

Methodology. To identify this ore, characterization is carried out on polished sections and thin blades, as well as a chemical analysis of the initial sample, an XRD analysis of different size fractions of the initial sample, a chemical analysis of major elements of iron ore from Gara Djebilet by XRF and quantitative analyses by EDX 74. Tests are conducted on different types of roast slices with grain sizes of (-0250 + 0.125; -0.125 + 0.063; 0.045 + -0063 and -0045 + 0.00) mm. Calcium chloride CaCl₂ additional to the dose ratio with iron ore: 10:90, 15:85, 20:80, 25:75 at different temperatures, 600 ºC, 700, 800 and 900 ºC. After cooling, the roasted mass is analyzed with XRF.

Findings. Different size fractions of the crude sample were analyzed by XRD. The obtained results show that the mineralogical composition comprises: hematite, phosphorus, silica, alumina and lime. The best results are achieved with the following parameters: the particle size range - 0.063 + 0.045 mm, upon the complete release of the useful component of its matrix with a P₂O₅ content equal to 0.06 % and Fe₂O₃ equal to 61.67 %. The effect of CaCl₂ (alkaline earth metal additive) on phosphorus during the roasting of iron ore in the ratio of 20 % CaCl₂ and 80 % Fe₂O₃ contributes greatly to the reduction of phosphorus in the ore from Gara Djebilet, Tindouf, Algeria.

Originality. The Gara Djebilet iron deposit has not been exploited yet due to its high phosphorus content. The originality of this research work resides in the application of the roasting process using calcium chloride at different grain sizes, temperatures and concentrations.

Practical value. This method allows us to reduce the phosphorus to an acceptable level for the steel industry. The present process is simple, economical and does not require investment in industrial equipment.

References:

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