Physicochemical study of 'dolomitic' sorbents prepared under different thermal conditions. Part III. The influence of carbon dioxide content over a heated sample

The physicochemical properties of 'dolomitic' sorbents formed through the p artial decomposition of dolomite have been discussed in two papers publishe d previously dealing with the influence of temperature and the time of heat ing. When carried out at 800 degreesC, the newly formed solid consisted of spongelike calcite and finely powdered magnesium oxide which was resistant mechanically and exhibited considerably greater porosity than the raw mater ial. Long-term heating led to a decrease in the porosity and to the partial elimination of pores. The corresponding 'dolomitic' sorbents prepared in a n inert atmosphere showed even greater porosity and a different internal st ructure when compared to those formed in the presence of carbon dioxide. Ho wever, no changes were observed as far as the chemical composition was conc erned.