On the Feasibility of the CaSO4-CaS Reaction for Regeneration of Sulfated Dolomite or Limestone in Sulfur Dioxide Pollution-Control Processes

Possible regeneration mechanisms for sulfated dolomite or limestone are presented. Preliminary test results are encouraging, however, the actual reaction mechanism has not yet been established. It may involve gas-solid interactions as intermediate steps, with the overall process represented by the solid-solid reaction: 3CaSO/sub 4/ + CaS yields 4CaO + 4SO/sub 2/. (ND)