Method for preparing high-strengthalpha-semihydratetitanium gypsum with industrial wastedihydratetitanium gypsum

The invention provides a method for preparing high-strengthalpha-semihydratetitanium gypsum with industrial wastedihydratetitanium gypsum. The method comprises the steps as follows: placing the industrial wastedihydratetitanium gypsum of titanium dioxideproduced with a sulfuric acid method in a drying oven to dry thedihydratetitanium gypsum to the constant weight, grinding the dihydratetitanium gypsum to be fine, and adding water to prepare the dihydratetitanium gypsum into slurry; adding a compound crystalloblastic agent to obtain a suspension liquid, adjusting the pH of the suspension liquid with an acid or an alkali, adding the suspension liquid into a reaction kettle, feeding an inert gas of certain pressure into thesuspension liquidwhile stirring, heating the reaction kettle to the temperature of 120-160 DEG C, and performing constant-temperature, constant-pressure and low-speed stirring to realize dehydration crystallization; turning on a vent valve to relieve the pressure to be within 0.1 MPa, continui