Titanium dioxide production mainly adopts three methods: sulfuric acid method, chlorination method and hydrochloric acid method. In my country, 95% of titanium dioxide is produced by sulfuric acid method. In the production process of titanium dioxide, waste acid will be generated. The waste acid discharges 8-10t, and the waste acid contains sulfuric acid, ferrous sulfate inorganic salt, etc., and its treatment process is complicated and difficult. At present, my country has become the second largest producer of titanium dioxide in the world, and the total amount of waste acid produced in the whole industry is about 8000kt/a. How to deal with and recycle these waste acids has attracted great attention from the industry. The concentration and reuse of titanium dioxide waste acid not only makes The waste acid resources are effectively utilized, and a lot of waste acid treatment costs are saved, and very significant economic and social benefits can be achieved.