Fly ash is a kind of fine ash collected from coal combustion flue gas. The main oxide composition of fly ash in thermal power plant in China is: SiO2, Al2O3, FeO, Fe2O3, CaO, TiO2, etc.. With the development of electric power industry, the amount of fly ash discharged from coal-fired power plants has increased year by year.

China is a large coal producing country, which uses coal as the main fuel. China's energy industry development, power generation capacity of 7.3% annual growth rate, the rapid development of power industry, brought a sharp increase in emissions of fly ash, fly ash total coal-fired power plant emissions annually increased year by year, 1995, fly ash emissions up to 1.25 tons, about 1.5 tons in 2000, to 2010 will reach 3 tons, caused great pressure to China's national economic construction and ecological environment. On the other hand, China is a person occupies the limited resources reserves of the country, the comprehensive utilization of fly ash, waste, reuse, has become China's economic construction is an important technical and economic policy, is to solve the environmental pollution of electric power production in China, an important means of the contradiction between the lack of resources. Is the electric power production facing one of the task. After the development of fly ash in construction, building materials, water conservancy and other departments have been widely used.

In 1970s, the world energy crisis, environmental pollution and the depletion of mineral resources strongly stimulate the research and development of fly ash utilization, held a number of International Conference of fly ash, the research work more thorough, the application also has made great progress. Fly ash has become noticeable in the international market is rich in resources, low price, new building materials and control of chemical products of raw materials, favored by people. Most of the research work on fly ash has been transferred from theoretical research to applied research, especially in the research and development of important resources. The production of products using fly ash is increasing, and the technology is constantly updated. The comprehensive utilization of fly ash and work compared with the past, has undergone major changes, the main performance is: the guiding ideology of fly ash governance from the past simple environment into a comprehensive governance and resource utilization; comprehensive utilization of fly ash in road base, from the past, concrete admixtures, soil embankment the transformation of the application, to the development of cement raw materials, cement, large water conservancy project, pumping concrete, concrete products, such as high utilization of advanced fillers.

The main composition of the fly ash is: SiO2, Al2O3, FeO, Fe2O3, CaO, TiO2, MgO, K2O, Na2O, SO3, MnO2, etc., in addition to P2O5. The silicon oxide and titanium oxide from clay, shale mainly from pyrite; iron oxide; calcium oxide from Magnesium Oxide and its corresponding carbonates and sulfates. The main source of fly ash is the coal-fired power plant and the city central heating boilers, of which more than 90% of the wet ash, the activity is lower than the dry ash, and water charges, pollution of the environment, is not conducive to comprehensive utilization. With the development of electric power industry, the amount of fly ash is increasing year by year. If into the water system will cause the blockage of river, and one of the toxic chemicals will cause harm to human and biological,

In addition, fly ash can be used as admixture of concrete. At present, China is one of the industrial waste residue with large amount of fly ash.

The combustion process of fly ash in pulverized coal combustion in the furnace chamber in a suspended state, the appearance characteristics in most of the Coal-fired Fly Ash combustibles are burned in the furnace, and the coal in the incombustible (mainly ash) mixed in high temperature flue gas. Due to the effect of high temperature, some of these non combustible materials are partially melted, and at the same time, a large number of small spherical particles are formed due to the effect of surface tension. Under the action of the exhaust fan of the boiler tail fan, the flue gas containing large amount of ash flows to the tail of the boiler. With the decrease of the flue gas temperature, a part of the molten particles are in a vitreous state due to a certain degree of cooling. Before the exhaust gas is discharged into the atmosphere by the draught fan, the small spherical particles are separated and collected through the dust collector, namely, the fly ash.

Fly ash looks like cement, milky white to black in color change. The color of fly ash is an important quality index, which can reflect the quantity and difference of carbon content. To a certain extent, it can also reflect the fineness of fly ash, the deeper the color, the smaller the particle size, the higher the carbon content. Fly ash has low calcium fly ash and high calcium fly ash. Usually the color of high calcium fly ash is yellow, and the color of low calcium fly ash is gray. The porous honeycomb structure is the fly ash particles, large specific surface area, adsorption activity is high, the particle size range of 0.5-300 M. And the wall has a porous structure, the porosity is as high as 50% - 80%, has a strong water absorption.

Elemental composition (mass fraction) of fly ash:  O： 47.83%，Si： 11.48%～31.14%，Al： 6.40%～22.91%，Fe： 1.90%～18.51%， Ca：0.30%～25.10%，K： 0.22%～3.10%，Mg： 0.05%～1.92%，Ti： 0.40%～1.80%，SO:03%～4.75%，Na： 0.05%～1.40%，P： 0.00%～0.90%，Cl： 0.00%～0.12%，Other：0.50%～29.12%。

Fly ash, also known as fly ash, is a fine powder in the flue gas cell phone, is composed of glass beads, quartz, iron oxide, carbon particles, sulfate and other mineral composition of the particle size is thin and uneven complex heterogeneous material. The large amount of fly ash not only takes up a lot of land, but also causes serious pollution of aquatic ecological environment and threatens human health. Fly ash in iron are mainly ferric oxide and iron oxide, iron silicate form, so the extraction of the iron powder by gravity separation process or physical dressing process separation effect is good. Because the ferric oxide is a kind of false magnetic or weak magnetic minerals.

Basic physical properties of fly ash:

Zhengzhou Jintai dressing equipment Co., Ltd. is committed to fly ash processing equipment, over the years accumulated a wealth of practical experience. The use of a wide range of waste resources to recover the valuable elements contained in fly ash, low cost, generous returns. According to the basic physical properties of fly ash, according to environmental protection and energy saving principle of Jintai machinery recommended by physical separation (gravity separation) principle, in accordance with the various elements of the proportion of relative density by centrifugal separator Kim mechanical production of fly ash in the valuable elements selected by the

majority of users favor.

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