Study of the influence of inorganic and organic additives on the possibility and regularity of the precipitation process of brushite from aqueous solutions

Abstract

The article presents a range of issues related to the peculiarities of brushite crystallization in the presence of additives based on thermodynamic calculations and experimental data. The authors studied the regularities of phase formation in the system of Ca2+ – HPO4 2- – H2O, an additive in a broad range of variation of concentrations of components and pH. The effect of silicate-, fluoride-, chloride- and hydrocarbonate-ions on the precipitation and the composition of the crystallizing phase was investigated. It was found that brushite and other calcium phosphates co-precipitate from the original system. Studying the influence of organic additives, it has been established that their presence leads to the precipitation of brushite admixed with apatite phase.