micro silica/silica fume

Micro-silica fume in the building materials industry and sales Micro-silica fume is at home and abroad in the field of high and new technology has broad application prospects for the fine material can be widely used in chemical industry, metallurgical industry. For cement or concrete to improve the performance of concrete or cement, prepared with ultra-high, strong, wear-resistant, resistant to erosion, corrosion-resistant, anti-penetration, antifreeze, the early strength of concrete or special cement compound to meet the oil - Well, marine oil drilling platform, harbor terminals, railway bridges highways, airport runways, tunnels and urban high-rise building projects, such as the special requirements; rubber can be used to improve the extension of rubber, tear and tensile strength ; For ceramics and refractories, effective products to improve the strength and durability. 1. Micro-silica fume concrete used in water conservancy and hydropower project, the project can improve the ability of anti-erosion at home and abroad traditional anti-abrasion material to make more use of polymer materials such as epoxy mortar, anti-erosion ability of such materials is a good one, but because of its own Linear expansion coefficient several times in the basement of ordinary concrete, concrete basement and adapt to the temperature is not good, in the natural climatic conditions cracking off easily, and construction of the complex, toxic, costly and can not promote the use of a large area. The use of micro-silica fume concrete, abrasive impact the ability to double about anti-48m / s velocity-class anti-erosion ability to raise more than 3 times. 2. Micro-silica fume concrete in the water, the project can improve the crack resistance of hydraulic concrete cracks, has become a major issue of general concern. Cracks in the material itself due to hydration heat of warming, such as the incorporation of fly ash in concrete, although lower-temperature electric heating, but the early strength is relatively low, so that the limited amount of fly ash. 3. Micro-silica fume concrete can improve the performance and the infiltration of anti-corrosion properties of salt to protect the steel. Underwater engineering due to infiltration of chloride ions in concrete, causing rapid corrosion of reinforced concrete delamination, short life expectancy, a serious destructive. Underwater concrete pouring generally catheterization, as the loss of cement so that it can not bond with the grass-roots level, and to reduce contact with water in some of the strength. The introduction of concrete under water in the micro-silica fume, these problems could have significantly improved. 4. Micro-silica fume concrete road traffic in the road repair, is extremely wear-resistant properties Also known as micro-silica fume silica fume, silica fume (silica fume, micro-silica), silicon metal or ferrosilicon alloy smelting and so on from the flue gas recovery in the dust. At present, the market's micro-silica fume, is part of the smelting flue gas filter through the collection of direct sales after the silica fume, but also is part of the smelting flue gas filter through the collection after the re-processed sales of silica fume. The average size of micro-silica fume 0.15-0.20, specific surface area for 15000-20000m2/kg. The main ingredients of silicon dioxide, the general content of 80-92% aerobic component of impurities Sodium, calcium oxide, magnesium oxide, iron oxide, alumina and activated carbon, and so on. Mineral composition, smelting process, collecting system and so can cause fluctuations in the composition. As the micro-silica fume in an amorphous material, high activity, small particles, surface area, have excellent physical and chemical properties, in the past was considered a waste industry is now increasingly seen as a Valuable resources, without going through a crush processing, low-cost ultrafine body. Can be widely used in the special concrete used in the project, refractories, cement, and other important areas. We have a variety of information resources, including paper, network, telephone surveys, discussions with business channels such as the application of micro-silica fume and market research conducted in this paper on the research results summarized in the hope of promoting China's micro-depth research and silica fume Application development and narrow the gap between the country's strengths and enhance its international competitiveness. 1 micro-silica fume in the application of foreign As early as 1947, Norway's Aiken (Elkem ASA) on the start of the micro-production technology of silicon powder and dust processing, grading and applied research, the world's first conduct research and development of silicon powder micro-enterprises, and always in the silicon micro - Powder collecting and processing technology to maintain its leading position. Subsequently, the United States, Russia, Japan began to conduct applied research and development, and become a major producer of fine silicon powder. At present, the micro-silica fume-year production: 300,000 tons the United States, Russia 150,000 tons, 120,000 tons Norway, Japan 70,000 tons. Abroad to micro-silica fume-based applications that can be developed.