Skip to main content
Log in

Monitoring of the evolved gases in apatite-ammonium sulfate thermal reactions

  • Published:
Journal of Thermal Analysis and Calorimetry Aims and scope Submit manuscript

Summary

Thermal reactions in natural fluorapatite or fluorcarbonate apatite and ammonium sulfate mixtures with mole ratio 1:4 at calcination up to 500°C were studied by simultaneous thermogravimetry and FTIR analysis of the evolved gases. The composition of natural apatite has little impact on the release of NH3. Upon the evolution of NH3 nitrous oxides were found in minor amounts. The release of SO2 at temperatures above 400°C is more intensive and occurs at lower temperatures in the case of fluorapatite than of carbonate containing apatites. Evolution of CO2 starts at 250°C with maximum at 350-360°C.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

Author information

Authors and Affiliations

Authors

Rights and permissions

Reprints and permissions

About this article

Cite this article

Tõnsuaadu, K., Pelt, J. & Borissova, M. Monitoring of the evolved gases in apatite-ammonium sulfate thermal reactions. J Therm Anal Calorim 80, 655–658 (2005). https://doi.org/10.1007/s10973-005-0709-3

Download citation

  • Issue Date:

  • DOI: https://doi.org/10.1007/s10973-005-0709-3

Navigation