MAGNESIUM REMOVAL FROM PHOSPHORIC ACID BY PRECIPITATION: OPTIMIZATION BY EXPERIMENTAL DESIGN Original scientific paper

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Vol 27 No 2
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Published: Jul 14, 2021
DOI: https://doi.org/10.2298/CICEQ200101030M
Keywords:
phosphoric acid, impurities, magnesium, optimization, design of experiments

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AHMED MAHROU
Laboratory of Physics and Nuclear, Atomic, Molecular, Mechanic and Energy, Department of Physics, Faculty of Sciences; University Chouaïb Doukkali, El Jadida, Morocco
R. JOURAIPHY
Environmental Sciences and Development Laboratory, Faculty of Science and Techniques, University Hassan I, Settat, Morocco
H. MAZOUZ
OCP. SA Jorf Lasfar, El Jadida, Morocco
A. BOUKHAIR
Laboratory of Physics and Nuclear, Atomic, Molecular, Mechanic and Energy, Department of Physics, Faculty of Sciences; University Chouaïb Doukkali, El Jadida, Morocco and Regional Center for Education and Training Trades, Casablanca-Settat, El Jadida, Morocco
MOHAMMED FAHAD
Laboratory of Physics and Nuclear, Atomic, Molecular, Mechanic and Energy, Department of Physics, Faculty of Sciences; University Chouaïb Doukkali, El Jadida, Morocco

Abstract

High content of magnesium in phosphate and phosphoric acid affects negat­ively the performance and operating conditions in phosphate industry. A con­tent of more than 0.3% in phosphate increases the P2O5 losses during phos­phate digestion and filtration, and also increases steam consumption and solid settling kinetics during concentration. In this work, the removal of magnesium from phosphoric acid by precipitation in one of the compounds, MgAlF5 or MgAl2F8, was studied. Magnesium precipitation is achieved by the simul­tane­ous addition of aluminum and fluorine. The experimental design methodology was used to carry out this work. Tests were conducted according to the NEMRODW software using industrial quality phosphoric acid. The screening study of parameters affecting the removal efficiency of magnesium from indus­trial wet phosphoric acid showed that from the following parameters: tempe­rature, F/Mg and Al/Mg ratios, aluminum form and fluorine form, only tempe­rature and F/Mg ratio have an effective influence on magnesium removal. The optimization of magnesium removal from phosphoric acid was performed according to the response surface methodology using a composite matrix. By applying this methodology, the optimum parameters corresponding to a maxi­mum magnesium removal efficiency in phosphoric acid were determined. The values of the optimum parameters obtained by this method are T = 80 °C, ratios: Al/Mg = 1 and F/Mg = 16.

Article Details

How to Cite
MAHROU, A. ., JOURAIPHY, R. ., MAZOUZ, H., BOUKHAIR, A., & FAHAD, M. . (2021). MAGNESIUM REMOVAL FROM PHOSPHORIC ACID BY PRECIPITATION: OPTIMIZATION BY EXPERIMENTAL DESIGN: Original scientific paper. Chemical Industry & Chemical Engineering Quarterly, 27(2), 113–119. https://doi.org/10.2298/CICEQ200101030M
Issue
Vol. 27 No. 2 (2021)
Section
Articles
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