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Special Topics & Reviews in Porous Media: An International Journal
ESCI SJR: 0.259 SNIP: 0.466 CiteScore™: 0.83

ISSN Imprimir: 2151-4798
ISSN On-line: 2151-562X

Special Topics & Reviews in Porous Media: An International Journal

DOI: 10.1615/SpecialTopicsRevPorousMedia.v1.i3.60
pages 257-267

LEACHING OF CALCINED PHOSPHATE ORE PARTICLES WITH PHOSPHORIC AND ACETIC ACID SOLUTIONS AT 25°C: KINETIC CURVES AND RELATED TEXTURAL CHANGES

Faouzi Ben Brahim
Material Sciences and Environment Laboratory, Chemistry Department, Faculty of Sciences, Route Soukra km 3,5 B.P. 1171, Sfax 3000
Arbi Mgaidi
Industrial Inorganic Chemistry Laboratory, Chemistry Department, Faculty of Sciences, Elmanar University of Tunis, 1060
Driss Oulahna
Chemical Engineering Laboratory for Particulate Solids, CNRS UMR 2392, School of Mines of Albi-Carmaux, Campus Jarlard, 81013 Albi
Mohamed El Maaoui
Industrial Inorganic Chemistry Laboratory, Chemistry Department, Faculty of Sciences, Elmanar University of Tunis, 1060

RESUMO

The reactivity of calcined Tunisian phosphate ore was studied in both phosphoric and acetic solutions. Phase analysis from X-ray diffraction and IR absorption data indicate that carbonate apatite, or francolite, and fluorapatite are the main phases. However, it was observed that the calcium oxide phase, evident at the most intense peak (d=2.401Å;2θ = 37.42°) and at the adsorbant band at around 700 cm−1 disappeared or were weakly defined for the solid leached in acetic medium. Nitrogen adsorption-desorption analysis shows a rising of mesopores at the surface of the leached particles and then an increase of their specific surface area, SBET. The scanning electron microscope micrographs of the particles and their size distribution show a constancy of their outer dimensions during attack.


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