AN INVESTIGATION OF THE INFLUENCE OF SODIUM-CHLORIDE ON THE DESULFURIZATION PROPERTIES OF LIMESTONE

This investigation shows how sodium chloride adsorbed on particles of limestone can influence certain surface characteristics of the calcium oxide obtained by the calcination process and its capability for flue-gas desulphurization. About 2 wt% of NaCl was found to favour the formation of CaO with a porous texture and also with a better size distribution, which is related both to a higher degree of conversion to CaSO4 of the sorbent and to a higher rate of conversion. This effect reaches a maximum activity at a temperature of about 850-degrees-C and markedly decreases with increase in the sorbent particle size. KCl behaves in a similar way. but other metallic chlorides examined led to a decrease of the sorption activity of the CaO.