The chlorination process is the mainstream of the development of titanium dioxide production process, but at this stage it is still difficult to change the industry structure dominated by the sulfuric acid process. According to China's national conditions, the two technologies will coexist for a long time. Therefore, some experts in the industry believe that in the pursuit of a breakthrough in the chlorination of titanium dioxide, it should actively implement the new production of sulfuric acid cleaner titanium dioxide. The development of the existing sulfuric acid production method requires the transformation of the resource utilization efficiency, environmental safety and ecology, and the refinement of the management process, especially in the “three wastes†management and comprehensive utilization, and truly achieve green production. . This is the information that the reporter learned from the second meeting of the oil and chemical industry energy-saving technology exchange and investment and financing held in Beijing in mid-October.
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"The Industrial Structure Adjustment Catalogue (2011 edition) lists the sulfuric acid method as a restricted category, which is intended to limit the unregulated development and unfavorable development of the sulfuric acid method in the industry and increase industrial concentration." Wuhan Fangyuan Titanium Dioxide Co., Ltd. Manager Mao Ming said in an interview with reporters that China's sulfuric acid titanium dioxide survival and development is the key to environmental protection, and only adhere to the road of energy-saving emission reduction, environmental protection and clean production, companies have the foundation to survive, only to survive competitive.
Titanium dioxide is the third largest inorganic chemical product with market value next only to synthetic ammonia and phosphorus chemical industry. It is currently the best white pigment in the world. At present, there are about 70 titanium dioxide production enterprises in China, with a production capacity of more than 2 million tons/year and a total output of 1.427 million tons in 2010, which has surpassed the United States as the world’s largest producer of titanium dioxide.
Mao Ming told reporters that the current world titanium dioxide production capacity of about 6 million tons / year, chloride law accounted for 51%, sulfuric acid law accounted for 49%, in more than 70 titanium dioxide manufacturers in China, the chloride method only Jinzhou titanium industry Co., Ltd., a production capacity of less than 2%, the other are sulfuric acid method. According to him, the sulfuric acid method is a wet method, and its production process is developed earlier. The quality of titanium raw materials is not high, the equipment is simple, and the technology is mature. Anatase titanium dioxide and rutile titanium dioxide can be manufactured. The disadvantage is that the process Long process, "three wastes" large displacement. The chlorination process is a dry process, the process is developed late, the product quality is good, the process flow is short, and the “three wastes†discharge is relatively small. The disadvantage is that the raw material requirements for titanium are much harsher than the sulfuric acid process, and a large number of Chlorine gas is complex in process control and requires strict equipment materials. The investment is 5 times that of the sulfuric acid method, and only rutile products can be produced and anatase products cannot be produced.
"Some large companies have gone to the chlorination project, but they haven't started, and they have no idea!" Mao Ming said that the transition from the sulfuric acid production line to the chlorination process line is not a simple process. Involving technology, funding and other issues. No matter which one is the enterprise is unbearable under current conditions.
People in the industry also generally believe that the improvement and promotion of China's chlorination process still needs a process, and comprehensively promoting the chlorination process is not a day's work. Although the titanium dioxide in the advanced countries has accounted for 60% to 70% of the total production capacity, it represents the overall development trend of the international titanium dioxide industry, but the production technology of the chlorination process is complex, usually based on different coatings, plastics, paper, etc. The product market uses post-treatment to improve the weather resistance of titanium dioxide products, as well as the dispersion, wettability, hiding power and gloss in different media (solvents, plastics, water-soluble latex), and the precise process flow. The requirements for equipment and materials are higher, and the core technologies and convergence technologies are difficult to grasp and the investment is huge.
Bi Sheng, director of the Titanium Divider Center of the National Productivity Promotion Center of the Chemical Industry, believes that the advantages of the chlorination process will be truly highlighted only when our titanium dioxide companies are truly able to digest the international advanced chlorination process. .
"The sulfuric acid method is relatively mature because of the technology, the ore source is relatively economically available, and the 'three wastes' can be effectively managed. The key is to do a clean production of the existing sulfuric acid process," Mao Ming said.
According to Mao Ming, in recent years, the concentration of industrial production capacity has increased, and many companies have achieved single-unit production capacity of 50,000 tons/year or more, and the scale and intensification effect have become prominent. The overwhelming majority of enterprises have carried out comprehensive treatment of "three wastes" and achieved compliance discharge. The application of new technologies, new processes, and new equipment such as wind sweeping, vacuum crystallization, diaphragm pressing, rotary flash evaporation, waste acid recycling, mixed filter residue, and waste heat recycling have had a profound impact on the energy conservation and emission reduction of the industry.
Take Titanium White as an example, the company has successfully developed a patented technology for the concentration and recycling of waste acid, which realizes the recycling of waste acid and completely solves the problems of system anti-corrosion, crystallization, and scaling. In the comprehensive utilization of rotary kiln thermal energy, the company has developed a patented technology for the comprehensive utilization of thermal energy in rotary kiln. This process technology will dry the material in the flue gas for dry recovery, improve the product yield, and a large amount of waste gas waste heat will be comprehensively utilized. During the production of sulfuric acid process titanium dioxide, the solid wastes produced mainly include acid filter residue and industrial gypsum. The company successfully developed the waste acid concentration filter residue utilization technology, and the filter residue was all turned into waste. The company also developed a green ash blending technology. Taking 100,000 tons/year of sulfuric acid as an example, it can burn 18,000 tons of green ash per year. For the application of industrial gypsum, Mao Ming introduced that the application of the technology in the cement industry has proved that there are no obstacles and the economy is still in the midst of the pilot test. A new breakthrough is expected in the near future.