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Sulfuric acid titanium dioxide is a typical highly polluting industry. Most of the sulfuric acid titanium dioxide enterprises in China use low-quality ilmenite as their raw materials, and large amounts of "three wastes" are discharged in production, which has a huge destructive effect on the surrounding environment. The production of one ton of titanium dioxide products requires about 40% of 100% sulfuric acid. After these sulfuric acids are used, except for a small amount of by-product ferrous sulfate, all others become acidic “three wastesâ€. At present, all companies have configured processing facilities. Most of the front and rear acidic tail gas adopts electric defogging and water spray absorption. For waste sulfuric acid with a concentration of about 20%, some companies increase their concentration through a concentration process for recycling. For waste acids that cannot be reused, Acidic wastewater with a concentration of 2% to 5% is treated only with alkalis (lime, carbide slag) and then precipitated and separated, and then deposited in the form of red gypsum (sludge).
According to Bi Sheng, director of the Titanium Dioxide Center of the National Productivity Promotion Center of the Chemical Industry, waste acid and waste water in the “three wastes†treatment in the titanium white industry are the biggest difficulties. Although there are no major technical problems, the economic costs are heavy. The cost of waste acid concentration is higher than that of buying new acid, and the neutralization of wastewater is actually only input and no output at all.
Relevant experts believe that the titanium dioxide industry must fundamentally solve environmental problems. The fundamental way out is to replace high-grade raw materials with high-precision raw materials and to develop or comprehensively utilize the treated products.
Titanium industry is difficult to pay for environmental protection
Recently, the reporter learned from the Titanium Dioxide Center of the National Chemical Industry Productivity Promotion Center that at present, the domestic titanium dioxide industry has always attached importance to environmental protection work, and the degree of "three wastes" is being comprehensively improved. However, the high economic cost is still an important factor hindering the improvement of its environmental protection level.