Abstract
CaS formed from the CaO sorbent during desulfurization in coal gasifiers has to be converted to CaSO 4 before disposal. CaS is mainly decomposed to CaO and SO 2 by O 2 and then CaO is converted to CaSO 4 by SO 2 and O 2. The role of H 2O in the oxidative decomposition of CaS with O 2 was studied using reagent grade CaS and H 2 18O. The following results were obtained: (1) there is a synergistic effect of H 2O and O 2 on the oxidative decomposition of CaS to CaO and SO 2; (2) H 2O reacts with CaS to form CaO, SO 2 and H 2 in the absence of O 2; (3) the oxidative decomposition of CaS to CaO and SO 2 occurs stepwise; (4) H 2O directly reacts with CaS in the presence of O 2; (5) H 2O plays an important role in the oxidative decomposition of CaS even if the O 2 concentration is high.
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