Method for recovering valuable components in hydrolysis mother liquor of titanium dioxide prepared by chlorination leaching method

The method comprises the following steps: heating and concentrating the titanium hydrolysis mother liquor obtained by filtering hydrated titanium dioxide prepared in a titanium liquor hydrolysis process, completely hydrolyzing Ti < 4 + > in the process, adding quantitative sulfuric acid to precipitate calcium ions in the form of calcium sulfate, and condensing and recovering hydrochloric acid to obtain the valuable component in the hydrolysis mother liquor. And filtering to obtain a calcium-titanium composite material and concentrated mother liquor. Fe < 2 + > in the concentrated mother liquor is oxidized into Fe < 3 + >, and valuable components Fe < 3 + >, Al < 3 + >, Mn < 2 + > and Mg < 2 + > in the concentrated mother liquor are sequentially hydrolyzed and precipitated by adopting a step-by-step precipitation method for adjusting the pH value. According to the method, hydrochloric acid and aluminum compounds are recycled, the production process is environment-friendly, iron oxide powder, manganese hydroxid