Thermal investigations on phase transformations of Syrian phosphorite: Part I
Syrian phosphorite is subjected to mechanochemical activation carried out in planetary mill. Some phase transformations are ascertained by means of powder XRD and thermal analyses. They reveal as partial transformation of carbonate fluorine apatite into carbonate hydroxyl fluorine apatite and formation of Ca(PO3)2, as well. The solubility of the activated sample in 2% citric acid is increased as a result of these changes.
KeywordsCarbonate-apatite Thermal analysis X-ray diffraction
Non-activated Syrian phosphorite
Activated for 1,800 s Syrian phosphorite with 20 mm milling bodies of non-alloy steel
Activated for 1,800 s Syrian phosphorite with 20 mm milling bodies of Cr–Ni alloy steel
Carbonate fluorine apatite
The authors thank the National Fund “Scientific research” of the Ministry of Education for the financial support (project DOO2-104).
- 1.Petkova V, Yaneva V. Thermal behavior and phase transformations of nanosized apatite (Syria). J Therm Anal Calorim (in press).Google Scholar
- 3.Chaikina MV. In: Avvakumov EG, editor. Mechanochemistry of natural and synthetic apatites. Novosibirsk: Publishing house of SB RAS, Branch “GEO”; 2002. pp. 11–5; 105–7; 114–5; 139 (in Russian).Google Scholar