Raw Composition for Manufacturing Dihydrate Gypsum of Cement and Manufacturing Method of the Dihydrate gypsum of Cement

摘要

The present invention relates to a raw material composition for manufacturing dihydrate gypsum for controlling setting of cement and a method for manufacturing dihydrate gypsum for controlling setting of cement using the raw material composition. The raw material composition for manufacturing dihydrate gypsum for cement setting control according to the present invention contains 35 to 50% by weight of a waste sulfuric acid solution having a purity of 40 to 55% by weight, 25 to 35% by weight of limestone mineral, and 20 to 30% by weight of supercritical fluidized bed boiler bottom ash. A reaction material composition comprising; and a reaction recovery agent; the composition including, but the supercritical fluidized bed boiler bottom ash is ash discharged through the process of burning coal fuel under supercritical conditions while injecting oxygen in the supercritical fluidized bed boiler As CaO 23-26% by weight, SO ₃ 19-23% by weight, Fe ₂ O ₃ 15-17% by weight, while containing 15-17% by weight CaO / SO ₃ Molar ratio of 1.15 ± 1.0 and 0.1-0.5mm in size powder and the limestone mineral is at least one selected from calcium carbonate, slaked lime, and quicklime, and the reaction recovery agent is sodium sulfate. Here, the reaction recovery agent may _{be preferably composed in an amount of 0.5 to 1.0 wt% based on the mixed mole weight of SO 3} and CaO in the reaction material composition, and the combined amount of the limestone mineral, the supercritical fluidized bed boiler bottom ash and the reaction recovery agent Based on 100 parts by weight, 70 to 100 parts by weight of the spent sulfuric acid solution may be preferably formulated.