From the "Industrial Structure Adjustment Catalogue (2011 edition)" issued at the beginning of this year, the "Proposal for the Implementation of Cleaner Production Technologies for the Titanium Dioxide Industry" issued a few days ago clearly expresses that the country has promoted the chlorination process as titanium dioxide. Industry to achieve energy-saving emission reduction, clean production of important measures. The industry believes that compared with the sulfuric acid process, the chlorination process has obvious advantages in energy conservation, emission reduction and raw material selection. With the policy direction already clear, the chlorination process will gradually move to the front. Portable High Pressure Car Washer,Multi Power Pressure Washer,Gasoline High Pressure Washer,Electric Pressure Washer Bison Machinery Co., Ltd. , http://www.tzgeneratores.com
Titanium dioxide production process is mainly divided into sulfuric acid and chlorination two. The main raw material for the sulfuric acid process titanium dioxide production process is ilmenite, which can produce both anatase and rutile titanium dioxide products; chlorination process can only produce rutile titanium dioxide, but the raw material selection range is wider, you can use titanium dioxide content It is 60%~95% of a variety of raw materials, such as natural rutile, synthetic rutile, white titanium, ilmenite or chlorinated high titanium slag.
According to experts, the sulfuric acid process is complex and requires about 20 process steps, and there are more wastes to be discharged, more process steps are required for the crystal transformation, and the incineration process used requires a lot of energy; the conversion of the anatase crystal form is included. The rutile form of the process, resulting in the production of rutile titanium dioxide is unlikely to reach 100% rutile crystal form, the difference between batches of product quality is more obvious than the chlorination method. The chlorination production technology is a continuous production process, the process is simple, the process control point is small, the product quality is easy to achieve the best, also reduces the generation of waste, coupled with the sintering without the kiln calcination process, product quality than sulfuric acid The method is better, and can greatly save energy in the refining process.
In general, titanium dioxide concentrate with titanium dioxide content of about 60% is also used to produce rutile titanium dioxide. The chlorination method saves 30% energy and 50% water compared to the sulfuric acid method. In addition, if the energy consumption of high-titanium slag smelting can also be included, the comprehensive energy consumption of chlorination using high-titanium slag is slightly higher than that of sulfuric acid. However, from the viewpoint of the energy consumption of 10,000 yuan, the chlorination method still has obvious advantages, and the utilization rate of resources is high.
According to statistics, as of the end of 2009, the total production capacity of titanium dioxide in the world was 5.7 million tons/year, of which the chlorination method was 3.2 million tons/year, accounting for 56%; while the current titanium dioxide production capacity was about 5.3 million tons/year, slightly lowering. However, the capacity of the chlorination process has risen in a contrarian direction, accounting for 63.2% of the total production capacity, reaching 3.5 million tons/year, and it has an absolute advantage in terms of total volume. Obviously, the chlorination method is more advanced and environmentally friendly than the sulfuric acid method, which has become the consensus of international titanium dioxide production companies. In recent years, the proportion of titanium dioxide produced by the chlorination process of internationally renowned titanium dioxide production companies has continued to rise.
In China, in the 1990s Jinzhou Ferroalloy (Group) Co., Ltd. established a 15,000-ton/year chlorination process titanium dioxide plant built through technical consulting and joint design. After more than ten years of hard work, it has basically met the design requirements. Annual output reached 36,000 tons. In addition, Sichuan Longxi Titanium Industry is also actively preparing to build 100,000 tons / year chloride titanium dioxide project.
In view of the current status of production of titanium dioxide by most domestic enterprises using the sulfuric acid process, China has adopted a series of macro-control measures and measures to accelerate industrial restructuring, including adopting a stricter access system for the new titanium dioxide production capacity, and actively promoting environmental protection in the titanium dioxide industry. The popularization of cleaner production processes and policy support, such as credit support policies, insurance support policies, export preferential policies, tax incentives, emissions trading policies, etc. The latest "Guidance Catalogue for Industrial Structure Adjustment (2011 edition)" sets all newly established sulphuric acid titanium dioxides as restricted projects and chlorination laws as incentives.
Experts pointed out that the fly in the ointment is that the encouraging conditions for the chlorination method are somewhat harsh in the Catalogue for the Adjustment of Industrial Structures (2011 Edition). For example, the single-line production capacity must be 30,000 tons/year or more, and the titanium dioxide content must not be Less than 90% of the titanium-rich material (synthetic rutile, natural rutile, high titanium slag) is used as raw material. It is understood that although China is the country with the most abundant titanium reserves in the world, most of the titanium resources are medium-low grade (titanium dioxide content of 45% to 47%). Titanium-rich raw materials with titanium dioxide content of not less than 90% are difficult to obtain. Most of the required titanium-rich materials are supplied by a small number of international mining oligopolies.
In this regard, experts pointed out that for the newly added chlorination process capacity, the use of only titanium-rich materials with a titanium dioxide content of not less than 90% is highly likely to make the production of chlorinated titanium dioxide in China repeat the same mistakes as the raw materials of the Chinese steel industry. It is not conducive to the domestic enterprises actively investing in the development of technology with independent intellectual property rights. In the long run, it hinders the healthy development of the chlorinated titanium dioxide industry in China and limits the competition between China's titanium dioxide industry and international giants.
The industry believes that since 90% of the titanium-rich material is not easy to find, domestic companies can use the characteristics of chlorination raw materials to choose diversity, and more to devote themselves to the development of chlorination projects, so as to achieve the goal of cleaner production in the entire titanium dioxide industry. .