Preparation method of calcium hydroxide with high specific surface area

The invention discloses a preparation method of calcium hydroxide with high specific surface area, and belongs to the technical field of calcium hydroxide preparation, the preparation method comprises the following steps: preparing calcium carbonate, modifying and calcining; the preparation method comprises the following steps: preparing calcium carbonate, namely crushing quick lime, mixing the crushed quick lime with water, stirring at 60-70 DEG C for digestion, then adding a hydrochloric acid aqueous solution, continuously stirring, filtering, adding ammonia water into filtrate, stirring at 60-80 DEG C, filtering, adding an ammonium carbonate aqueous solution and calcium carbonate microspheres into the filtrate, stirring at 60-80 DEG C, standing at 60-80 DEG C, and filtering to obtain the calcium carbonate. Filtering, washing filter residues with water, and drying after washing to obtain calcium carbonate; the calcium hydroxide prepared by the method has the specific surface area of more than 40m < 2 >/g, u