Analysis on the development of titanium dioxide in

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Analysis on the development of titanium dioxide in China

titanium dioxide is a rapidly developing chemical product in the world, which is widely used in many fields

at present, the global production and demand of titanium dioxide are basically flat, and the production landlords are concentrated in North America and Western Europe, of which the United States is the largest producer in the world

China's titanium resources account for about 1/5 of the world's total reserves, but the output of titanium dioxide only accounts for 3% - 5% of the world's total output, indicating that China's titanium dioxide industry is still very backward. It is both necessary and possible to develop titanium dioxide industry in China

titanium dioxide is a white powder with good light scattering ability, so it has good whiteness, high coloring power, strong hiding power, high chemical stability and good weather resistance. Titanium dioxide step 2: when installing the fixture, the powder is a powder with great polarity. If air, water, etc. are adsorbed on the surface, the dispersion in water will be reduced. The commonly used treatment agents are hydrated alumina and hydrated silicon oxide

the coating industry is the main user of titanium dioxide, especially rutile titanium dioxide, which is mostly consumed by the coating industry. With the development of China's automobile industry and construction industry, the coating industry not only needs more titanium dioxide in quantity, but also has higher requirements for variety and quality

the paint made of titanium dioxide has bright colors, high hiding power, strong coloring power, low dosage and many varieties, which can protect the physical stability of the medium, enhance the mechanical strength and adhesion of the paint film, prevent cracks, prevent ultraviolet and water penetration, and prolong the service life of the paint film

the enamel made of titanium dioxide has strong transparency, light weight, strong impact resistance, good mechanical properties, bright colors, and is not easy to be polluted

the plastic industry is the second largest user of titanium dioxide. Adding titanium dioxide into plastics can improve the heat resistance, light resistance and weather resistance of plastic products, improve the physical and chemical properties of plastic products, enhance the mechanical strength of products and prolong the service life

titanium dioxide is not only used as a colorant in the rubber industry, but also has the functions of reinforcement, anti-aging and filling. Titanium dioxide is added to white and color rubber products. Under sunlight, it is resistant to sunlight, does not crack, does not change color, and has large elongation and acid-base resistance. Titanium dioxide for rubber is mainly used in automobile tires, rubber shoes, rubber floors, gloves, sports equipment, etc. it is generally anatase type. However, when used in the production of automobile tires, a certain amount of rutile products are often added to enhance its ozone and ultraviolet resistance

titanium dioxide is an indispensable white pigment in advanced inks. The ink containing titanium dioxide is durable, does not change color, has good surface wettability, and is easy to disperse. Titanium dioxide used in the ink industry has rutile type and anatase type

the paper industry is the third largest user of titanium dioxide. Titanium dioxide is mainly used in high-grade paper and thin paper as paper filler. Adding titanium dioxide to the paper can make the paper have better whiteness, good gloss, high strength, thin and smooth, non penetrating during printing, and light weight. Titanium dioxide for papermaking generally uses anatase titanium dioxide without surface treatment, which can play the role of fluorescent brightener. 7. It is estimated whether the designed product can have excellent performance in practical application and increase the whiteness of the paper. However, the laminated paper requires the use of rutile titanium dioxide with improved market operability after surface treatment of scrap steel to meet the requirements of light resistance and heat resistance

textile and chemical fiber industry is another important application field of titanium dioxide. Titanium dioxide for chemical fiber is mainly used as a matting agent. Because anatase is softer than rutile, anatase is generally used. Titanium dioxide for chemical fiber generally does not need surface treatment, but some special varieties need surface treatment in order to reduce the photochemistry of titanium dioxide and avoid the degradation of fibers under the photocatalysis of titanium dioxide

the production methods of titanium dioxide mainly include sulfuric acid method and chlorination method

sulfuric acid method sulfuric acid method is to acidolysis iron titanium powder with concentrated sulfuric acid to produce titanium sulfate, which is hydrolyzed to produce metatitanic acid, and then calcined and crushed to obtain titanium dioxide products. This method can produce anatase and rutile titanium dioxide. The advantage of sulfuric acid method is that it can take ilmenite and sulfuric acid as raw materials, which are easy to get at a low price. The technology is mature, the equipment is simple, and the anti-corrosion materials are easy to solve. Its disadvantage, the deterioration of the earth's environment, has aroused widespread concern. It is a long process, which can only be operated intermittently, wet operation, high consumption of sulfuric acid and water, many wastes and by-products, and great environmental pollution

chlorination chlorination is to produce titanium tetrachloride by mixing rutile or high titanium slag powder with coke and chlorinating at high temperature. After high temperature oxidation, titanium dioxide products are obtained by filtration, water washing, drying and crushing. Chlorination can only produce rutile products. The advantages of chlorination method are short process, easy expansion of production capacity, high degree of continuous automation, relatively low energy consumption, less "three wastes" and high-quality products. Its disadvantages are large investment, complex equipment structure, high requirements for materials, high temperature resistance and corrosion resistance, difficult maintenance of the device, and great difficulty in research and development

the research, development, production and application of titanium dioxide in foreign countries started earlier. Since the 1970s, titanium dioxide production technology has entered a mature period. In the 1980s, especially in the 1990s, with the increasingly stringent requirements of environmental protection, the sulfuric acid method has been increasingly restricted. Almost all newly launched enterprises in industrialized countries use chlorination process

China's titanium dioxide industry started late. In 1955, China began to study titanium dioxide prepared by sulfuric acid, made anatase titanium dioxide for coating in 1958, and preliminarily mastered the technology of rutile titanium dioxide prepared by sulfuric acid in 1967. Domestic chlorination research began in 1967, but little progress has been made due to many reasons

at present, the gap between China and developed countries is in the following aspects: first, the production technology is backward. China is still dominated by sulfuric acid process, and there is a big gap in process technology, equipment, automatic control monitoring, "three wastes" treatment and product quality compared with foreign countries. Second, the production scale is small. The average scale of foreign devices is 60000 tons/year, while that of China is only 4000 tons/year, and many enterprises have only a few hundred tons. Small production scale and high energy consumption lead to poor product quality. Third, the grade of raw materials is low. Most foreign countries use high-grade raw materials, while China basically uses ilmenite directly. The grade of ore source is low, which affects the product quality. Fourth, the product quality is poor. In foreign countries, rutile titanium dioxide with good optical properties, covering power, coloring power and weather resistance is mainly used, and there are various special titanium dioxide products. In China, anatase type is the main type, most of which are not surface treated, and there are few special products, and the products have shortcomings such as poor whiteness, low coloring power, poor grinding dispersion and so on

insiders put forward the following suggestions based on the current development situation of China's titanium dioxide industry: first, develop high-grade and highly specialized products, and develop in the direction of serialization, standardization and specialization, so as to meet the quality requirements of different industries for products. The second is to transform the existing production process and equipment of titanium dioxide by sulfuric acid, expand the production scale, increase varieties, improve quality, reduce energy consumption, and comprehensively utilize by-products. Third, actively seek cooperation with large foreign companies to drive the development of China's titanium dioxide industry

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