Fly ash

Fly ash


Fly ash is a coal combustion product that is composed of the particulates (fine particles of burned fuel) that are driven out of coal-fired boilers together with the flue gases. Ash that falls to the bottom of the boiler is called bottom ash. In modern coal-fired power plants, fly ash is generally captured by electrostatic precipitators or other particle filtration equipment before the flue gases reach the chimneys. Together with bottom ash removed from the bottom of the boiler, it is known as coal ash. Depending upon the source and composition of the coal being burned, the components of fly ash vary considerably, but all fly ash includes substantial amounts of silicon dioxide (SiO2) (both amorphous and crystalline), aluminium oxide (Al2O3) and calcium oxide (CaO), the main mineral compounds in coal-bearing rock strata.

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Fly-ash Processing Plant

1. Open flow high-fine grinding process
The open-flow high-fine grinding process is one of the grinding methods often used in fly ash processing because of its low investment and simple process. Although this process is simple, it is conducive to operation and saves production investment, but it is easy to cause over-grinding to cause serious damage to the original shape of most of the microbeads, increase the water demand, or the actual grinding of the product is insufficient, and the swimsuit is running rough, and the power consumption is also Larger.
2, closed circuit grinding process
The raw ash of fly ash is fed from the head of the tube mill, discharged from the end of the mill, sent to the classifier for analysis by the hoist, and the unqualified coarse particles enter the grinding head for grinding, and the qualified finished fine materials are put into the finished product. Library.
3, semi-finish grinding process
The process can maintain the inherent particle shape of the fly ash as much as possible, can reduce the over-grinding, the secondary sorting can effectively control the fineness of the finished product, the grinding efficiency is high, and the power consumption is low. However, it is not suitable for fly ash with a large particle size and a small amount of qualified fine powder in the principle.
4. Open flow fine powder grinding process
The process is developed according to the characteristics of different fly ash and the performance requirements of the product. The process uses the open-flow method to grind the coarse powder after the sorting, and the fine powder sorted by the grinding material and the fine powder sorted before the grinding meet at the grinding tail discharge port. For the finished product. It can be divided into two processes: first sorting and then open flow grinding or direct open grinding.
First sorting and re-opening grinding is suitable for dry row or dried wet fly ash. This process retains the advantages of the above process and also greatly compensates for the amount of water under the product support. And the lack of fineness control.


Application field


Chemical industry




Building materials

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