Method for processing fly ash

Abstract

The invention discloses a method for processing fly ash, which comprises the following steps that: 1, original fly ash is taken out from an original fly ash cabin and directly enters an original fly ash hoisting machine through a feeding metering device; 2, the original fly ash is fed into a secondary air rotor separator for separation, crude ash obtained after separation enters a crude ash silo through a crude ash pneumatic conveying chute and a crude ash hoisting machine, and fine ash obtained after separation enters a fine ash silo through a fine ash pneumatic conveying chute and a fine ash hoisting machine; and 3, the crude ash and the fine ash are loaded on a truck to be delivered out of a storage by discharging devices respectively, the crude ash enters an cement producing fly ash silo, the fine ash enters an concrete producing fly ash silo, and thus the separation of the crude ash and the fine ash is realized. The method is low in production cost, high in separation efficiency and low in separation power consumption, saves crude ash and is used in cement as an admixture.

Description

technical field [0001] The invention relates to a processing method of fly ash. Background technique [0002] As the market for ready-mixed concrete in urban applications is growing, the demand for fine ash is increasing. The price difference between fine ash and raw ash is doubled, and direct purchase of fine ash increases the cost of concrete; For sorting, the two major problems of power consumption and sorting efficiency must be solved. [0003] At present, there are usually two processing methods for separating coarse ash and fine ash from fly ash. One is the grinding process, that is, the raw ash of fly ash separated by the first electric field of the electrostatic precipitator or bag filter enters the ball mill. Grinding, the finely ground ash can reach the standard of first-grade ash or second-grade ash in concrete, but this process is not easy to grind the fly ash mainly composed of spherical vitreous bodies, otherwise, after breaking up a large number of spherical ...

AI Technical Summary

Problems solved by technology

[0003] At present, there are usually two processing methods for separating coarse ash and fine ash from fly ash. One is the grinding process, that is, the raw ash of fly ash separated by the first electric field of the electrostatic precipitator or bag filter enters the ball mill. Grinding, the finely ground ash can reach the standard of first-grade ash or second-grade ash in concrete, but this process is not easy to grind the fly ash mainly composed of spherical vitreous bodies, otherwise, after breaking up a large number of spherical vitreous bodies, the specific surface area A substantial increase will greatly increase the amount of mixing water, which is not conducive to improving the early strength of cement and concrete. The other is the sorting process. This method is almost used for sorting ash in power plants. More than 80% of the raw ash is treated with a turbine classifier. Classification, the main disadvantages of this method are: a. There is a side wall effect in the turbo classifier; Consumption 7kw / h

Both processing methods must first check the water demand ratio of the fly ash raw ash, which can be processed only after it meets the requirements of the secondary ash or primary ash used in concrete, and the processing is more complicated

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