Capture And Application Of Silica Fume
Silica fume can directly go into human alveolar by breathing
. It does great harm to human health. At present, there are thousands of ferrosilicon and industrial silicon furnaces in China. China generally produces about 25 million tons every year. Environmental protection equipment can capture about 50,000 tons of silicon powder. And the rest are directly discharged into the atmosphere.
Silica fume is no exact pricing standards, the price per ton for 1500 to 3000 RMB per ton. If the price is 2000 RMB, the annual vertical silica fumes as the resource utilization value of the loss of approximately $ 200 million. However, due to the flue gas dust cleaning equipment is not up to a lot of silica fume was discharged with the flue gas, not only pollutes the environment, waste of resources. Flue gas treatment is imperative. Recovery to capture the micro-silica fume is the subject of environmental and social benefits, but also contains a lot of economic benefits and the value of science and technology.
Silica fume particle size is too small. Mechanical filter including pulp dust, inertial dust and cyclone can not catch it. The water film dust capture it is very difficult. Also, because of its particularly high specific resistance, the use of conventional electric dust removal device will produce the phenomenon of back corona. It will be difficult to trap it. The use of international advanced electric In addition to the devices on a pulse of electric precipitators, from a performance perspective, able to trap high resistivity dust, but its investment in equipment is extremely expensive, about 10 times the conventional electrostatic precipitator. Capture micro-silica fume device with a large bag filter. Directly trapping the experience of the general dust bag filter used to trap silica fume, may not achieve the desired effect.
The United States, former Soviet Union, Norway and other countries also have a big bag to trap the silica fume. The advantage is the dust removal efficiency, reliable performance, and simple manipulation. But this method also has some problems. Industrial silicon in the smelting process, the high exhaust gas temperatures up to 400-600 C, so you must install the cooling device, otherwise it will burn the cloth bag. Particles of silica fume is very fine, very viscous, not easily rapping cleaning, and easily broken bags off the bag, affecting the normal production. How to combine the high flue gas temperature and particle size fine and sticky characteristics between the received silica fume is the choice of a bag filter that must be considered subject. Into the breathing tube by the electric furnace by the set of the hood into the high-temperature flue gas temperatures up to 400 to 600 C, after cooling and cold air mixing temperature is approaching 230 below, enter into the pre-processor for large particle separation, separated from the flue gas after the fan enter into the dust removal device, the dust removal device filtered flue gas emissions and dust bagging recycling.
Silica fumes high-tech fields that have a broad application of the vision of high-quality materials. It is widely used in construction, chemical, metallurgical and other industries. A lot of silica fume for cement or concrete admixture, used to improve the performance of cement or concrete, preparation of ultra high strength, wear, wash-resistant, corrosion-resistant, anti-infiltration of special concrete or composite cement for large water conservancy, hydropower, port terminals, railway bridges, highways, airport runways, tunnels and urban high-rise buildings and other works.
Silica fume can be widely applied in paints, coatings, resins and fillers of other polymer materials. If it is used in rubber, it will extend the tear resistance and tensile strength. The metal powder supplier also uses it in the production of refractory materials and ceramic products to effective improve strength and durability of the product. In short, though the gas treatment of submerged arc furnace, silica fume are recycled and captured. It not only solves the environmental pollution, but increases the economic profit for enterprise. And it develops needed resources for contemporary high-tech fields. Source:http://www.mhcmp.com
by: anelwew
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