Introduction

Fly ash is the fine ash collected from the flue gas after coal combustion. Fly ash is the main solid waste discharged from coal-fired power plants. Most of the combustibles in coal can be burned out in the furnace, while the non-combustibles (mainly ash) in pulverized coal are mixed in large quantities in high temperature flue gas. These noncombustibles are partially melted due to high temperature and form a large number of fine spherical particles due to surface tension. Under the suction action of the draught fan at the tail end of the boiler, the flue gas containing a large amount of ash flows to the furnace tail. As the flue gas temperature decreases, some of the melted particles become vitreous due to quenching to a certain extent, and thus have high potential activity. These fine spherical particles are separated and collected by the dust collector before the exhaust gas is discharged into the atmosphere by the induced draft fan. The main oxides of fly ash in China's thermal power plants are SiO₂, Al₂O₃, FeO, Fe₂O₃, CaO, TiO₂ and so on. Fly ash is one of the industrial waste slags with large discharge in China. With the development of electric power industry, the amount of fly ash emission from coal-fired power plants increases year by year. A large amount of fly ash without treatment will produce dust, polluting the atmosphere; if discharged into the river system will cause siltation, and the toxic chemicals will also cause harm to human beings and organisms.

Fly ash Processing technology

The precondition of fly ash utilization is that the fineness of materials is strictly required, so it must be grinded. Vanguard's Fly ash mill production combines the advantages of similar products in domestic milling machine manufacturers, has the advantages of high capacity, low energy consumption, high fineness and reliability. Compared with the same products in the market, the energy saving is 40%, and the output is increased by 20%. The latest research and development into the market of the European version of the mill specializes in fly ash grinding, its mill combined with many years of mill production experience, the design and development of advanced grinding equipment, widely used in cement, power, chemical, non-metallic ore and other industries. Working Principle of Fly Ash Pulverizer: When the power of the main motor is decelerated by the gear reducer and the driving shaft and the plum blossom rack fixed on the central shaft are rotated, the grinding roller rotates around the central shaft under the action of centrifugal force, and also swings parallel to the load shaft, so that the grinding roller is compressed outward parallel to ensure that the grinding roller and the grinding ring are rotated. Maximum surface contact. At the same time, the grinding roller rotates around the grinding roller axis, so that the material shoveled by the spade can be crushed and grinded. The crushed powder is blown by the air flow of the blower to the analyzer above the main engine for screening. The coarse particle still falls into the main engine chamber for re-grinding, and the particle size meets the requirements of the air flow into the large cyclone collector, after collection, it is out. The powder tube is discharged as finished product.
China is a big coal producing country, and coal is the basic fuel for electric power production. China's energy industry has developed steadily with an annual growth rate of 7.3% in power generation capacity. The rapid development of power industry has brought about a sharp increase in fly ash emissions. The total amount of fly ash discharged by coal-fired thermal power plants has increased year by year. In 1995, fly ash emissions reached 125 million tons, in 2000, about 150 million tons, and will reach 300 million tons by 2010. Tonnes, causing enormous pressure to China's national economic construction and ecological environment. On the other hand, China is also a country with limited reserves of resources per capita. The comprehensive utilization of fly ash has become an important technical and economic policy in China's economic construction. It is an important means to solve the contradiction between the environmental pollution and the lack of resources in China's electric power production. It is also an electric power student. One of the tasks faced by the industry. After development, fly ash has been widely used in construction, building materials, water conservancy and other departments. In recent years, great changes have taken place in the comprehensive utilization of fly ash both at home and abroad compared with the past. The main manifestations are as follows: the guiding ideology of fly ash treatment has changed from simple environmental perspective to comprehensive treatment and resource utilization; the ways of comprehensive utilization of fly ash have changed from subgrade, filling, concrete admixture in the past. In addition to the application in soil modification, it has developed into advanced utilization of cement raw materials, cement admixtures, large-scale water conservancy projects, pumping concrete, mass concrete products and advanced fillers. Adding fly ash to concrete saves a lot of cement and fine aggregate; reduces water consumption; improves workability of concrete mixtures; enhances pumpability of concrete; reduces creep of concrete; reduces heat of hydration and thermal expansion; improves impermeability of concrete; increases modification of concrete.

Application fields Through the deep processing, Fly ash can be widely used in the following industries.

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