Method of producing solid moldings from a by-product of wet limestone-gypsum desulfurization of flue gas

A method of producing a solid molding from slurry which has done absorption in wet limestone-gypsum desulfurization of flue-gas comprising the steps of:

• a) concentrating a gypsum-containing absorption slurry drawn from a wet limestone-gypsum flue-gas desulfurization apparatus;
• b) mixing and kneading the concentrated slurry with flyash from a coal-fired combustion source and also with either quicklime or slaked lime to for a mixture;
• c) molding the mixture into a desired shape using a mold;
• d) then curing the molded mixture in a reaction chamber through which a part of desulfurization gas which is saturated with water due to the wet limestone-gypsum flue-gas desulfurization is passed;
• whereby the solid molding is produced.