Purification method of ferrous sulfate as byproduct of titanium dioxide

The invention discloses a purification method of ferrous sulfate as a byproduct of titanium dioxide. The ferrous sulfate as the byproduct of the titanium dioxide contains titanium, magnesium and manganese impurity elements. The preparation method comprises the following steps: (1) dissolving the ferrous sulfate as the byproduct of the titanium dioxide with water to obtain a ferrous sulfate solution; (2) adding iron powder into the ferrous sulfate solution obtained in the step (1), heating to 90 DEG C or above, and adding phosphoric acid till the pH value of the solution is up to 3 to 4.5; (3)adding sulfide and fluoride into the solution obtained in the step (2), and stirring; (4) adding a flocculant into the solution obtained in the step (3), and then removing flocculating sediment to obtain a purified ferrous sulfate solution. The impurity element content of the extracted ferrous sulfate can meet the requirement of producing battery grade iron phosphate. 本发明公开种钛白粉副产物硫酸亚铁的提纯方法。所述钛白粉副产物硫酸亚铁含钛、镁、锰杂质元素，包括如下步骤：（1