Abstract
The thermal reactions of SO2 with natural and synthetic apatites (Aps) with different substitutions have been studied by thermogravimetric analysis. The experiments under dynamic and isothermal conditions (at temperatures ranging from 550 to 900°C) have been performed in the air-SO2 flow with different SO2 content (0.07%, 1%, 10%). The reactions proceed at temperatures from 400°C to 800-850°C according to the two or three-dimensional diffusion models and the reaction rate depends on temperature, SO2 concentration and substitutions in the Aps structure (PO4?CO3, F?OH).
