METHOD AND EQUIPMENT FOR TREATING EXHAUST GAS DESULFURIZATION WASTE

摘要

PROBLEM TO BE SOLVED: To reduce the treatment cost at a time of exhaust gas desulfurization to a large extent while effectively utilizing resources. SOLUTION: In the treatment equipment of exhaust gas desulfurization waste, the exhaust gas desulfurization waste based on MgSO4 and Mg(OH)2 generated when sulfur oxide in combustion exhaust gas is removed by an absorbent comprising MgO or Mg(OH)2 is dissolved in water to form a slurry and Ca(OH)2 is mixed with the slurry to form a sediment of CaSO4.2H2O and Mg(OH)2. Thereafter, this sediment is separated into Mg(OH)2 and CaSO4.2H2O and Mg(OH)2 is reutilized as the absorbent of sulfur dioxide in the combustion exhaust gas and the remaining CaSO4.2H2O is recovered as gypsum.