The aim of this study is to evaluate H2S desulfidation reactivity of calcined dolomite. Six dolomites having different CaO/MgO mole ratio were calcined at 1173 K under air atmosphere, and H2S desulfidation reactivities of them were investigated by a fixed bed reactor. H2S desulfidation experiments were conducted for 120 minutes at 1173 K under H2S/N2 atmosphere. In order to investigate effects of physical and chemical characteristics of calcined dolomites or calcined limestones on its conversions, EDX observation, SEM observation, MgO content in dolomite, BET specific surface area and pore volume were analyzed. Consequently, it was found that conversions at 120 minutes are closely correlated with the BET specific surface area, and that magnesium oxide content in calcined dolomite have an important role for H2S desulfidation. The average H25 absorption capacity per weight of calcined dolomite was 1.17 times of calcined limestone.
This study was made to investigate the characterization and HC1 gas removal of calcined dolomite hydrate (mixture of Mg (OH) 2 and Ca (OH) 2) synthesized by hydrating the calcined dolomite with water contained fructose. The calcined dolomite hydrate with ultrafine particles was synthesized by adding fructose solution to the calcined dolomite which was heated the dolomite at 1000°C for 1 hour. The sample was characterized by means of X-ray diffraction, measurements of specific surface area and particle size distribution. The limestone, which was contained in the dolomite, was dissolved using 0.10 mol dm-3 HC1 solution. The calcined dolomite was obtained by heating the treated dolomite at 1000°C for 1 hour. The calcined dolomite hydrate with ultrafine particle was synthesized by hydrating the calcined dolomite using fructose solution for 6 h, and was a mixture of Ca (OH) 2 and Mg (OH) 2. The specific surface area of the calcined dolomite hydrate increased with the increase of fructose/calcined dolomite mass ratio. In fructose/calcined dolomite mass ratio of 0.07, the specific surface area of the calcined dolomite hydrate was 147 m2·g-1 Ca (OH) 2 and Mg (OH) 2 were uniformly dispersed in sample. The HC1 gas removal ability of the calcined dolomite hydrate was enhanced with increase of specific surface area.