Comprehensive utilization of fly ash

When it comes to the comprehensive utilization of fly ash, it is often easy to think that fly ash can be used to produce aerated concrete, building blocks, microcrystalline glass, and can also be used as a raw material for cement production, used to produce various decorative panels, geopolymers, and so on. Aluminum oxide, molecular sieves, etc. can also be produced from fly ash using wet metallurgy methods.
The comprehensive utilization of fly ash is encouraged by national industrial policies and has developed rapidly in recent years. Especially the use of fly ash in the field of building materials and in the production of alumina has been highly valued by various sectors. The comprehensive utilization of fly ash is beneficial for eliminating environmental pollution caused by the accumulation of fly ash, and can create certain economic benefits. However, according to the author's research, although the use of fly ash in the field of building materials is a large-scale utilization approach, the economic value created by the utilization process is not high. From the perspective of valuable elements such as silicon, aluminum, and iron contained in fly ash, it is essentially a low-level utilization of the valuable resources mentioned. The production of aluminum oxide from fly ash is a good way to utilize it, but simply purifying aluminum oxide and discarding other valuable elements not only fails to create the necessary economic benefits, but also causes more serious pollution to the environment due to the generation of wastewater and waste residue. This has been proven by industrial practices conducted by some units in recent years. In short, the comprehensive utilization of fly ash is in line with national industrial policies, which is not only necessary for environmental protection but also for economic development.