1. Cement industry

The cement industry is the most important way of utilizing fly ash. Fly ash can be used as a cement raw material instead of clay, and can also be used as a cement admixture, among which fly ash is more commonly used as a cement admixture. Generally, the admixture of fly ash in cement is 15%-30%, and the admixture of ultrafine fly ash is higher. From a nationwide perspective, the market price of first-grade fly ash is 50-150 yuan/ton except in areas with serious fly ash accumulation. Increase the added value of fly ash and expand the market radius.

2. The concrete industry

Fly ash is mainly used in concrete as a concrete admixture, and it can also be used to prepare concrete aggregates through certain technologies.

Fly ash can be used as an admixture for concrete. The application of fly ash can not only reduce the amount of cement and reduce the cost of concrete production, but also improve the working performance of concrete, resulting in obvious technical, economic and environmental benefits. It has become one of the indispensable and important components in concrete production.

3. Wall material

The application of fly ash in the field of wall materials is divided into sintered products, autoclaved silicate products and less/no cement clinker fly ash products, including bricks, blocks and boards from the form of wall materials. The chemical composition of fly ash and clay is similar, and brick and block wall materials can be prepared by sintering. In areas with a large amount of fly ash, the use of fly ash to replace clay and other resources to produce new wall materials is the present and the future. development direction. Fly ash contains silicon and aluminum components, and is the raw material for autoclaved silicate products. It can be used to produce autoclaved bricks, autoclaved aerated concrete blocks and panels. With the advancement of building energy conservation and wall material innovation, Autoclaved aerated concrete blocks and slabs are more energy-efficient and more environmentally friendly than traditional wall materials, and will inevitably be vigorously praised and developed.

4. Traffic Engineering

Fly ash has pozzolanic activity or cementitious properties, and has certain soil properties.

V. Environmental Governance and Ecological Restoration

Make full use of the activity and soil properties of fly ash to prepare a vegetation restoration building material suitable for plant growth. Acid to neutral, strong water retention, providing nutrients for plant growth, providing the basis for plant growth, especially under special conditions, such as slopes, deserts, abandoned quarries, landfills and other regional plants key to growth. Under the premise of current environmental protection, the application of fly ash vegetation restoration building materials in desert solidification and vegetation restoration, mine management and vegetation restoration will be very promising.

6. Use of useful components

Fly ash contains a variety of useful elements such as silicon, aluminum, iron, carbon, gallium, germanium, etc. Using fly ash as a raw material to extract relevant valuable elements is an important way to realize high value-added utilization of fly ash in the future. At present, the carbon and iron separation technologies of fly ash are relatively mature, and important progress has also been made in the separation and extraction of alumina, silica, metal gallium and other technologies. There are also foreign researchers engaged in the relevant research work of extracting phosphorus, magnesium and other elements from fly ash according to the local characteristics of fly ash. The fly ash after extracting useful elements can also be used for building materials production for comprehensive utilization to avoid secondary pollution from fly ash residues. At present, in terms of industrial application, only the alumina production line of Datang International Renewable Resources Development Co., Ltd. with an annual output of 200,000 tons has been completed and put into operation.