The results obtained by studying decarbonization of different samples of Estonian limestone and dolomite and the following
sulphation or carbonation of calcined products to estimate their SO2 and CO2 binding ability were presented. Experiments were
carried out with thermogravimetric equipment(Q-Derivatograph, MOM and Labsys™, SETARAM) – calcination of the samples in the
atmosphere of air with the heating rate 10 K per minute using multiplate crucibles, the following sulphation or carbonation
of the calcined products after cooling to the fixed temperature (temperature range 400–900C) under isothermal conditions
in the flow of air-SO2 or air-CO2 mixture. Chemical, X-ray, BET nitrogen dynamic desorption, etc. methods for the characterization of the initial samples,
intermediate and final products were used.
In addition, the possibilities of recurrent use of oil shale ashes taken from different technological points at operating
thermal power plants (Estonian and Baltic TTPs, Estonia) as sorbents for SO2 binding from gaseous phase were studied, as well as the possibilities of activation of these ashes towards SO2 binding.
The results of these studies confirmed the high reactivity of Estonian limestone and dolomite towards SO2 and CO2. Dependence of SO2 binding mechanism on the SO2 concentration has been established. Modelling of SO2 capture of dolomite and limestone was carried out to establish the kinetic parameters of these processes. The possibilities
of activation of oil shale ashes and their effective recurrent use for binding SO2 and CO2 from gaseous phase were confirmed.