Abstract: According to the chemical composition and the physical properties of the desulphurization slag generated in dry desulphurization process, it was put forward that the dry desulphurization slag can be used as the main component of cementitious materials of highsulfur ash. Based on the research of its composition, structure and relevant physical and chemical properties, its characteristics were determined, and its reclamation way was proved preliminarily. The factors influenced on the stability and the oxidizability of the CaSO3 in the calcium sulfite type desulphurization slag were analyzed. The performance requirement and the economical rationality of the entire activation technology at normal temperature were researched. The rule and the mechanism of the inner reaction of the cementitious materials of highsulfur ash based on desulphurization slag were explored; and the optimized application theory and the technology control parameters of different desulphurization slag in related construction material production were studied, which provides technical foundation for effective utilization of the desulphurization slag. 

Key words: dry desulphurization slag, chemical composition, physical property, research on reclamation