Add time:08/16/2019         Source:sciencedirect.com

The concentered region of the CaCO3_P2O5_H2O ternary system was investigated at 25,35 and 70 °C using Schreinemaker's method and synthetic method based on conductivity measurement. The characterization of stable solid phase was realized by X-ray diffraction and complexometric titration, which shows the presence of three solids stable region Ca(H2PO4)2.H2O_Ca(H2PO4)2_CaHPO4 in the three isotherms. H3PO4.12H2O presents stable equilibria with liquid and Ca(H2PO4)2 at 25 °C, these equilibria do not occur at 35 and 70 °C. Equilibrium zone between H3PO4 and Ca(H2PO4)2 was determined at 25 and 35 °C but disappeared at 70 °C. The limits between different regions were determined by the titration of the phosphoric acid (H3PO4) and calcium cation (Ca2+) concentrations in the liquid phase.

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