Matériaux & Techniques
Volume 109, Number 2, 2021
|Number of page(s)||7|
|Section||Environnement - recyclage / Environment - recycling|
|Published online||20 September 2021|
Optimization of phosphogypsum conversion into calcium carbonate and lithium sulfate monohydrate
Laboratory of Physical Chemistry of Materials (LPCM), Faculty of Sciences, Chouaib Doukkali University,
Route Ben Maachou,
* e-mail: firstname.lastname@example.org
Accepted: 1 September 2021
Phosphogypsum (PG) is an acidic by-product generated during the production of phosphoric acid. Usually this by-product is stockpiled or dumped into water bodies, which causes several environmental pollution problems. The aim of this work is to reduce this environmental risk by producing CaCO3 and Li2SO4.H2O from the conversion of PG by Li2CO3. To optimize the reaction conditions, four parameters have been investigated such as the initial concentration of the reagents, the reaction duration, the temperature and the gypsum purity. In addition, the nature of the resulting products was proved principally by X-ray diffraction technic. The obtained results show that the initial concentration of the reagents and the reaction duration are the most influential parameters, while the temperature has no significance effect on this reaction. Also, the acidity and the presence of impurities into PG induce its reactivity compared than commercial gypsum. The purity of the formed CaCO3 and Li2SO4.H2O at the optimum conversion of PG is 96.08 and 98.71% respectively.
Key words: phosphogypsum / conversion / calcium carbonate / lithium sulfate / optimization
© SCF, 2021
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