Étude de l’effet d’un polyacrylate et d’un polyphosphate sur la morphologie et la minéralogie du sulfate de calcium

S. Ben Ahmed; M.M. Tlili; M. Ben Amor; S. Joiret

doi:doi:10.1051/jp4:2004122022

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Numéro		J. Phys. IV France Volume 122, December 2004


Page(s)		141 - 147
DOI		https://doi.org/10.1051/jp4:2004122022

J. Phys. IV France 122 (2004) 141-147
DOI: 10.1051/jp4:2004122022

Étude de l'effet d'un polyacrylate et d'un polyphosphate sur la morphologie et la minéralogie du sulfate de calcium

S. Ben Ahmed¹, M.M. Tlili¹, M. Ben Amor¹ and S. Joiret²

¹ Laboratoire de Géochimie et Physico-Chimie de l'Eau, Institut National de Recherche Scientifique et Technique, BP. 95, 2050 Hammam-Lif, Tunisie
² Laboratoire Interface et Systèmes Électrochimiques, UPR 15 du CNRS, Université P. et M. Curie, 4 place Jussieu, Courrier n°133, 75252 Paris Cedex 05, France

Abstract
The retarding influence of polyacrylate and polyphosphate on the nucleation of calcium sulphate was investigated. SEM analyses show that these inhibitors didn't only influence the nucleation kinetics but also the precipitate morphology by adsorption onto crystal growth sites. The influence of different concentrations of the additives on the mineralogy of solid precipitated was also examined. Spectroscopy Raman analyses showed that the calcium sulphate can precipitate under different phases, gypsum (CaSO₄.2H₂O), hemihydrate (CaSO₄.1/2H₂O) and / or anhydride (CaSO₄), as function of inhibitors concentrations.