Method for recovering titanium dioxide in titanium white waste acid

The invention relates to a method for recovering titanium dioxide in titanium dioxide waste acid, which comprises the following steps: 1) adding 98% concentrated sulfuric acid into waste acid generated in a process for preparing titanium dioxide by a sulfuric acid method to prepare acid, and controlling the temperature not to exceed 50 DEG C in the acid preparation process; and 2) curing the mixed solution after acid preparation, filtering and separating, and returning the filtrate to an acidolysis process in a process for preparing titanium dioxide by a sulfuric acid method. According to the method disclosed by the invention, titanium can be recycled by controlling the temperature in the acid preparation process while waste acid in the titanium dioxide process is recycled, and the method is simple in process and easy to implement. In addition, the titanium content in the yellow ferrous iron obtained by recovering the filter cake can be reduced, and the purity quality of the yellow ferrous iron is improved. 本