Our country's sulfuric acid method of titanium dioxide of dilute acids concentration process has achieved the breakthrough, and has solved the environmental problem which long restricted the sulfuric acid method of titanium dioxide production. The concentration and edulcoration of recycling industrialization project of waste dilute sulphuric acid of sulfuric acid method of the titanium dioxide builded independently by Chengdu Qianli technical innovation Co., LTD . has been through the appraisal in Sichuan province, and 50000 tons/year titanium dioxide of concentration and recovery device has been completed a year of demonstration operation.

According to the technical inventor, Gongjiazhu's introduction, the sulfuric acid method of titanium dioxide of dilute acids concentration process applied the mixed acid process technology of eliminating the supersaturation of foreign ion in the dilute acids concentration process, and applied the big diameter of graphite heat exchanger successfully in the concentration of dilute acids of titanium dioxide, and realized the equipment of nationalization and large-scale devices. The process separated and concentrated filters which can be used in the production of sulfuric acid by burning the pyrite, and iron cake can be directly as ironmaking materials, realizing the comprehensive utilization of resources.

The demonstration unit using the patent technology in Sichuan province of Excellent Vanadium, Titanium Co., LTD has been operated successfully for one year, achieved the evaluation index of industrialization and pollutant emission achieved national standards, which effectively improved the production efficiency of devices and concentration acid of quality. The concentration acid produced by this device can substitute the raw material used in production of titanium dioxide whose quality meets the national standards and the directive standards of European Union RoHS.

According to deputy general manager of Excellent Vanadium, Titanium Co., LTD, ZouQiang's  introduction, they have builded the device of sulphuric acid of concentration and recovery (fold 100%) 50000 tons/year, which matched 50000 tons/year of titanium dioxide production scale, The total investment is 22 million yuan not including patent fee and other intangible assets investment. Since it has been put into production for a year, it has achieved good economic and social benefits. Every tons of titanium dioxide recycled a ton of sulfuric acid (fold 100%), directly and increased economic benefit of RMB 350, and for less than two years, it could take back the investment of production equipment.