For now, titanium white powder but the darling of the market, rose straight up do not say, but also led to the downstream products, titanium dioxide is widely used in paint, plastics, paper, printing ink, chemical fiber, rubber, ceramics, cosmetics, food and industrial prices The upswing. Its production process is mainly divided into sulfuric acid method and chlorination method. For a long time, the chlorination production technology is much more advanced than the sulfuric acid production technology. When domestic large enterprises do publicity, they are often proud of the ability to produce titanium dioxide by chlorination. So what is the chlorination method compared to the titanium dioxide sulfuric acid production technology? 1 sulfuric acid method titanium white powder production process Sulfuric acid process titanium dioxide production mainly iron ore as a raw material titanium with sulfuric acid is decomposed into TiOSO4 solution was filtered to remove insoluble impurities titanium sulfate solution, and then by vacuum crystallization, solid-liquid separation to remove FeSO4 · 7H2O. After concentration, it is thermally hydrolyzed to obtain metatitanic acid, washed, bleached to remove soluble sulfate and filtered, and after dry grinding, an anatase product is obtained or a promoter is added during calcination to form an uncoated gold. Red stone type initial product or product. For the production of higher-grade rutile products, the initial product must be slurried, degraded and classified by wet grinding, and the inorganic surface treatment is carried out to wash off the salt in the material, and then dried and then subjected to ultrafine grinding and organic treatment. 2 chlorination method titanium dioxide production process The chlorination method uses titanium-containing raw materials, such as natural rutile, synthetic rutile, ilmenite or chlorinated high-titanium slag, to react with chlorine to form titanium tetrachloride, which is purified by rectification, and then subjected to gas phase oxidation in rapid cooling. After gas-solid separation, TiO2 is obtained. The chlorinated titanium dioxide mainly has three major processes described as follows: (1) Chlorination process: The carbon element is used to convert the titanium element in the raw material into crude TiCl4; the chlorination process can be either boiling chlorination or molten salt chlorination, and the crude TiCl4 is purified to obtain pure refined TiCl4. . (2) Oxidation process: Gas phase oxidation of refined TiCl4 to obtain rutile TiO2 particles in accordance with pigment properties. The process includes pre-heating titanium tetrachloride and adding simultaneously prepared aluminum trichloride, and two-step oxygen preheating to carry out the oxidation reaction. The titanium dioxide semi-finished product and the furnace gas are obtained by cooling, gas-solid separation, and chlorine gas back to chlorination. The separated titanium dioxide semi-finished product is pulped and dechlorinated for post-processing. (3) Post-treatment process: The post-treatment is basically similar to the sulfuric acid process, except that the process technology of the envelope treatment is different, and the products adapted to different uses are produced. Because the post-treatment process and equipment are similar to the sulfuric acid method, the slurry can be sanded or not. So the chlorination process The difference from the sulfuric acid process is mainly in the previous process. As can be seen from the figure, the chlorination process is much less than the sulfuric acid process, and the waste discharge is much less. Although the sulfuric acid method can produce both anatase type products and rutile type products, it can be seen from the above figure that the sulfuric acid process has a complicated process and requires about 20 process steps, more wastes are discharged, and crystal form conversion is required. For more steps, the incineration process used consumes a lot of energy. In the sulfuric acid production process, the anatase crystal form is converted into a rutile crystal form, so that the produced rutile type titanium dioxide cannot reach 100% of the crystal form, and the batch quality difference of the product quality is also more than that of the chlorination method. obvious. The chlorination production technology is a continuous production process. Compared with the non-continuous process of the sulfuric acid process, the process is simple, the process control points are small, the product quality is easy to achieve optimal control, and the waste generation is greatly reduced. In addition, there is no sintering formed by the rotary kiln calcination process, and the titanium dioxide primary particles are easy to depolymerize, so the quality of the product is better than that of the sulfuric acid method, and the process of product refining greatly saves energy compared with the sulfuric acid process. Similarly, the use of titanium concentrate with a titanium dioxide content of about 60% to produce rutile titanium dioxide, the chlorination method is 30% more energy efficient than the sulfuric acid method, saving 50%. Titanium dioxide two process emissions comparison table (take 10,000 tons of titanium dioxide production as an example) In addition, if the chlorination method uses high-titanium slag as a raw material, it can be seen from the following table that the chlorination method has obvious advantages compared with the sulfuric acid method, both in terms of theoretical energy consumption and comprehensive product energy consumption. However, from the perspective of product life cycle, such as the energy consumption of high-titanium slag smelting, the comprehensive energy consumption of chlorination using high-titanium slag is slightly higher than that of sulfuric acid. However, from the energy consumption per 10,000 yuan of output value, the chlorination method still has obvious advantages, and the resource utilization rate is high. In particular, the chlorination method capable of directly using iron ore has lower energy consumption than the sulfuric acid method (see table), and the environmental protection advantage is more obvious. Comprehensive energy consumption analysis table of chlorination method and sulfuric acid method Summary: Chlorination method Titanium dioxide production technology is more advanced and environmentally friendly than sulfuric acid production technology. It is the consensus of international titanium dioxide production enterprises, which is why in recent years, the proportion of titanium dioxide produced by internationally famous titanium dioxide production enterprises using chlorination method The reason for the continued rise. As far as the domestic situation is concerned, the chlorination technology is still in the leading enterprises of titanium dioxide in foreign countries. Domestic chlorinated titanium dioxide and high-end titanium dioxide still need to be imported. FantasView Multi-Fit Snow (winter) wiper blades feature a protective rubber boot to help prevent snow and ice from clogging the blade. This allows the blade to maintain even pressure to provide a clean wipe and enhance driving visibility. Winter Wiper Blades are constructed of high-grade speed; and extruded rubber for durability and performance in wet, wintry weather. Multi-Fit Snow Wiper Blades,Multi-Clip Snow Wiper Blades,Multi-Fit Winter Wiper Blades,Multi-Fit Snow Windscreen Wiper Blades NINGBO FANTASVIEW WIPER BLADES CO., LTD. , http://www.fantasview.com
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