Process for improving fly ash activity

Abstract

The invention relates to a process for improving fly ash activity. The process is characterized in that: fly ash is adopted as the raw material, and a composite grind-aiding activator accounting for 2%-5% of the fly ash weight is added; grinding is carried out to control the specific surface area up to 450m<2> / kg-650m<2> / kg; and specifically, the composite grind-aiding activator comprises the following components by mass percentage: 5%-15% of calcium lignosulphonate, 65%-85% of sodium sulfate, 10%-20% of sodium carbonate and 3%-5% of calcium sulphoaluminate.

Description

technical field [0001] The invention relates to the technical field of environmental protection and energy saving, in particular to a process for improving the activity of fly ash. Background technique [0002] Fly ash is one of the largest industrial wastes in my country, and it is a bulk solid waste discharged during the power generation process of coal-fired power plants. With the continuous improvement of fly ash application technology, the undisturbed fly ash separation process has been adopted by most coal-fired power plants. In this process, the undisturbed fly ash is physically screened to form two types of products, fine ash and coarse ash. Fine ash meets the standard of Class II fly ash in the relevant national standards, and is mainly used in commercial concrete; coarse ash cannot be used with high value due to the large gap between the technical indicators and the relevant national standards, and the large fluctuation of the indicators. Wet discharge into ash s...

AI Technical Summary

Problems solved by technology

However, most of the effective active substances in the coarse ash are basically screened out, and the remaining effective active substances are limited.