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[Chemical Knowledge]：Production and manufacturing method and process flow of titanium dioxide

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Titanium dioxide is an important inorganic chemical pigment, widely used in coatings, plastics, paper, printing ink, chemical fiber, ceramics, cosmetics, food packaging and other industries. In the field of chemical production raw materials, the manufacturing methods of titanium dioxide are mainly sulfuric acid method and chlorination method.

1. sulfuric acid method

sulfuric acid method is the main method of domestic production of titanium dioxide, the process is as follows:

1. Acidolysis: the ilmenite and concentrated sulfuric acid acidolysis reaction, the generation of ferrous sulfate and titanic acid.
2. Water washing: The acidolysis mixture is washed with water to remove impurities.
3. Calcination: The washed mixture is calcined at high temperature to generate titanium dioxide and ferrous sulfate.
4. Water Washing: The calcined mixture was washed again with water to remove impurities.
5. salt treatment: with salt treatment after washing of titanium dioxide, improve its whiteness and weather resistance.
6. Drying: The salt-treated titanium dioxide is dried to obtain the finished product. The advantage of

sulfuric acid method is that low-grade ilmenite can be used as raw material, and the production cost is relatively low. However, this method produces more waste acid and waste residue, which need to be treated with corresponding environmental protection facilities.

2. chlorination

chlorination is the international more advanced titanium dioxide manufacturing method, the process is as follows:

1. Chlorination: high-grade ilmenite and chlorine chlorination reaction, the generation of titanium tetrachloride and ferrous chloride.
2. Oxidation: Titanium tetrachloride is oxidized at high temperature to generate titanium dioxide and chlorine.
3. Gas phase hydrolysis: titanium dioxide is hydrolyzed at high temperature to generate titanium dioxide and hydrogen chloride.
4. Separation: titanium dioxide and hydrogen chloride are separated to obtain the finished titanium dioxide and hydrogen chloride by-product. The advantages of

chlorination are high product quality, good environmental protection and low energy consumption. However, this method requires high-grade ilmenite as a raw material, and the production cost is relatively high.

3. other manufacturing methods

in addition to sulfuric acid and chloride method, there are some other manufacturing methods, such as hydrochloric acid method, electrolysis method and so on. These methods also have some advantages and disadvantages in the production process, so they need to be selected according to the specific situation in actual production.

4. manufacturing method of comparison and selection of

sulfuric acid method and chlorination method is the mainstream of titanium dioxide manufacturing method, both have advantages and disadvantages. When choosing a manufacturing method, it is necessary to consider factors such as the quality of raw materials, production costs, and environmental protection requirements. Generally speaking, the sulfuric acid method is suitable for treating low-grade ilmenite, and the production cost is relatively low; the chlorination method is suitable for treating high-grade ilmenite, and the product quality is higher. In actual production, it can be selected and adjusted according to specific conditions. The future development trend of

5.

With the continuous progress of science and technology and the continuous improvement of environmental protection requirements, the future of titanium dioxide manufacturing methods will pay more attention to environmental protection and sustainability. Some emerging manufacturing technologies such as nanotechnology and biotechnology will also be used in titanium dioxide manufacturing to further improve product quality and performance. At the same time, with the intensification of competition in domestic and foreign markets, enterprises need to strengthen technological innovation and product research and development, improve product quality and reduce costs in order to enhance market competitiveness.

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