Summary: Fly ash is one of the industrial wastes with large displacement in China. With the development of the power industry, the amount of fly ash discharged from coal...

Fly ash is one of the industrial wastes with large displacement in China. With the development of the power industry, the amount of fly ash discharged from coal-fired power plants has increased year by year. Therefore, the hazards of fly ash also threaten the sustainable development of the social ecological environment. Recently, I learned from the media that the fly ash, which was originally waste and has been criticized, has become a treasure from garbage in the comprehensive utilization of a million kilowatt ultra-supercritical coal-fired power plant. Not only does it no longer pollute the surrounding environment, but it also creates good economic value.

It is understood that fly ash is solid waste generated by coal during combustion. In China, due to the large number of coal-fired power plants, fly ash has become a single source of pollution for industrial solid waste, with annual emissions exceeding 300 million tons. However, at present, there are many methods and measures in China that can reuse fly ash. For example, China Huaneng Yuhuan Power Plant has made great efforts to introduce a batch of internationally advanced production equipment to produce fly ash into building materials. In the past two years, Huaneng Yuhuan Power Plant's comprehensive utilization of fly ash was 1,206,800 tons, equivalent to saving 950,600 tons of cement, saving raw materials cost of 211 million yuan, emitting 774,400 tons of carbon dioxide to the atmosphere, saving 301.7 acres of land. Good social and environmental benefits.

The series of millimg equipment can process fly ash into fine powder of different particle size. In particular, the Raymond mill equipment has a three-dimensional structure, a small footprint, a complete set of products, uniform fineness of the finished powder, and a 99% pass-through rate. The fly ash can be processed into the building materials field. The processed fly ash can be blended with an appropriate amount of gypsum, and a certain amount of aggregates such as cinder or water-quenched slag can be added. After processing, stirring, digestion, wheel milling, compression molding, and atmospheric or high-pressure steam curing, it can be made into wall materials. Sintered fly ash bricks use fly ash, clay and other industrial wastes as raw materials; they are prepared through raw material processing, stirring, forming, drying and firing. Autoclaved foamed fly ash insulation bricks are a new type of thermal insulation brick that takes fly ash as the main raw material, adds a certain amount of lime and foaming agent, and is produced through mixing, stirring, firing and autoclaving. By using fly ash as the raw material, adding an appropriate amount of quicklime, cement, gypsum and aluminum powder, mixing with water to form a slurry, and injecting it into a mold, a porous lightweight building material can be produced. Fly ash ceramsite is an artificial lightweight aggregate made by using fly ash as the main raw material, mixing it with a small amount of binder and solid fuel, then pelletizing and high-temperature sintering.