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Journal of Thermal Analysis and Calorimetry

, Volume 100, Issue 1, pp 51–56 | Cite as

Thermal investigations on phase transformations of Syrian phosphorite: Part I

  • V. Petkova
  • V. Yaneva
Article

Abstract

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.

Keywords

Carbonate-apatite Thermal analysis X-ray diffraction 

Abbreviations

A

Non-activated Syrian phosphorite

B

Activated for 1,800 s Syrian phosphorite with 20 mm milling bodies of non-alloy steel

C

Activated for 1,800 s Syrian phosphorite with 20 mm milling bodies of Cr–Ni alloy steel

C-F-Ap-Ca10(PO4)6F2-2x(CO3)x

Carbonate fluorine apatite

Notes

Acknowledgement

The authors thank the National Fund “Scientific research” of the Ministry of Education for the financial support (project DOO2-104).

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2009

Authors and Affiliations

  1. 1.Central Laboratory of Mineralogy and CrystallographyBulgarian Academy of Sciences, SofiaSofiaBulgaria
  2. 2.Technical University––VarnaVarnaBulgaria

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