Method for producing high-efficiency water purifying agent magnesium ferrous sulfate from titanium dioxide waste acid by using sulphuric acid method

The invention discloses a method for producing a high-efficiency purifying agent magnesium ferrous sulfate from titanium dioxide waste acid by using a sulphuric acid method, aims to overcome the defect of the commonly used purifying agent at present, solves the problem of waste acid pollution in a titanium dioxide plant and provides a method for producing the purifying agent. The method comprisesthe following steps: putting mother liquor into a reaction pool; adding magnesia with the MgO content of more than or equal to 85 percent into the mother liquor; mixing with a stirrer; controlling the adding amount of the magnesia by using a method of measuring the specific gravity of mixed liquor with a Baume hydrometer; controlling the adding amount of waste sulphuric acid by using a method of detecting the pH value of the mixed liquor; controlling the reaction temperature not to exceed 95 DEG C; performing pressure filtration on a reacted mixed liquor with a pressure filter after the reaction is performed for 1.5 t