Fly ash is the fine ash collected from flue gas after combustion of power plant boilers. The main components are silica, aluminum oxide and a small amount of ferric oxide, calcium oxide, magnesium oxide, sodium oxide, potassium oxide and sulfur oxide. Large amount of coal consumption produces large amount of fly ash. In terms of mineralogy, fly ash is mainly composed of vitreous and crystalline phases, and also contains a certain amount of unburned carbon. The vitreous component is mostly aluminosilicate vitreous, usually accounting for more than 60% of the mass fraction of fly ash. The crystalline components of fly ash are mainly mullite, quartzite and iron ore, in which the proportion of mullite is the largest, accounting for about 6%-15% of the total. Unburned carbon is generally not more than 5% in fly ash. In general, the smaller the fineness of fly ash, the smaller the burning loss, the larger the specific surface area, the more active sites and the higher the activity. The fly ash with high activity is easy to react with other substances to generate new substances, which is suitable for resource utilization.
Used to make cement, concrete, brick and block. As a building material, fly ash has several characteristics: easy to analyze, spherical particles exist, can be matched with concrete, large amount of use, wide range of use and high degree of use. The use of fly ash in construction accounts for about 45% of the total utilization, the main products are: fly ash cement (mixing more than 30%), concrete, ordinary cement, wall materials, roadbed filler, silicate load-bearing block and small hollow block, sintered ceramic, sintering brick and so on.
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