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Dolomite or limestone is sulfated when used as a sulfur-sorbent in the fluidized bed combustion of high sulfur coal. Dolomite that was sulfated by this process was regenerated for subsequent reuse as a sorbent to CaOMgO by reductive decomposition in a fluidized bed. Regeneration was accomplished by the incomplete combustion of methane in a fluidized bed of sulfated dolomite to generate the heat and the required reducing gases for the reactions at 1010-1100 °C. Experimental results indicate that at the conditions studied, the use of shallower fluidized beds, lower fluidizing-gas velocities, and higher reaction temperatures increased both the extent of regeneration and the SO2 concentration in the effluent gas. Dolomite losses due to attrition ranged from 5 to 15%. When regenerated dolomite was resulfated, it was found that the dolomite that had been regenerated in the hightemperature (1100 °C) experiments was less reactive as a sulfur acceptor than was dolomite that had been regenerated at a lower temperature (1040 °C). Nevertheless, the reactivity of dolomite samples regenerated at all temperatures compared favorably with that of virgin dolomite.

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