粉煤灰的活性激发与机理研究进展

Research progress on activation and mechanism of fly ash

粉煤灰是燃煤电厂中煤粉燃烧后的固体废弃物,其日益累积不但会占用大量土地资源,还会破坏原有的自然环境,造成严重污染,近年来粉煤灰的处理和资源化利用受到广泛关注。激发粉煤灰的潜在活性是提高粉煤灰综合利用率的关键。对粉煤灰的物理活性和化学活性来源进行了介绍,并对粉煤灰活性的物理激发、水热激发及化学激发技术与激发机理进行了综述,为后续粉煤灰的活化研究和大规模利用提供了参考。不同手段均能激发粉煤灰活性,但采用单一手段激发时存在活化成本高、激发程度低等问题。未来粉煤灰激发技术将朝着多种手段并用的方向发展。

Fly ash is the solid waste after the combustion of pulverized coal in coal-fired power plants.Its increasing accumulation not only occupies a large amount of land resources,but also destroys the original natural environment and causes serious pollution.In recent years,the treatment and resource utilization of fly ash has received widespread attention.Improving the comprehensive utilization of fly ash is the key to stimulate the potential activity of fly ash.The physical activity and chemical activity sources of fly ash were introduced,and the physical activation,hydrothermal activation and chemical activation technology and activation mechanism of fly ash activity were reviewed,which provided reference for the subsequent activation research and large-scale utilization of fly ash.The fly ash could be activated by using various methods,however,when selected the sole activation method,it needed high investment and suffered low activation degree.In the future,fly ash excitation technology would develop in the direction of multiple means.