METHOD FOR OXIDATION OF FLUE GAS DESULFURIZATION ABSORBENT AND THE PRODUCT PRODUCED THEREBY

摘要

A method for treating the fine-grained spend absorbent (primarily calcium sulfite and calcium sulfate) from a dry flue gas desulfurization process. The absorbent, having a small amount of binder therein, is oxidized in a fluidized bed reactor at a temperature in the range from about 700 DEG C. to about 1000 DEG C. to produce a dry essentially fully oxidized pelletized calcium sulfate product. Calcium sulfate pellets having an average diameter of from about 0.5 mm to 5 mm and containing from about 1% to about 3%, by weight, of binder constituents, are composed of agglomerated calcium sulfate particles having an average diameter of from about 50 mu to about 100 mu bound to each other by the binder constituents.