Resource utilization status and development trend of bulk solid waste of coal-based ash/slag

In recent years, the rapid development of the coal industry has provided important energy security and raw material support for the national economy. At the same time, coal-fired power plants, industrial, civil boilers and other equipment produce large quantities of coal-based ash/slag (fly ash, coal-fired slag, gasification slag) and other industrial solid waste during the coal combustion and gasification processes, which have a significant impact on the ecological environment.Taking coal-based ash/slag represented by fly ash and gasification slag as an example, China emits about 800 million tons of fly ash and 35 million tons of gasification slag every year. However, limited by the national energy structure, industrial policy and other factors, as well as the resource distribution of coal-based ash/slag and the nature of the origin of the constraints. At present, the efficient resource utilisation of coal-based ash/slag is still to be improved. Among them, the comprehensive utilization rate of fly ash is 70