煤气化灰渣资源化利用分析

Status and Prospects for Resource Utilization of Coal Ash

煤气化灰渣在固体废物中占据重要比例,对灰渣进行合理利用,不仅可以消除灰渣的危害,还可节约大量物质资源,变废为宝,因此,研究煤气化灰渣的综合利用途径、开发灰渣综合利用新技术,具有重要的现实意义。本文对煤气化灰渣的性质及利用现状进行了综述,灰渣的主要成分为氧化硅、氧化铝、氧化钙及残炭,化学性能相对稳定,应用安全,其的利用分为低值化、中值化和高值化应用,目前低值化及中值化利用较多;最后本文结合煤气化工艺灰渣的特点,提出工艺排放废灰渣综合利用途径,可为废弃物灰渣的资源化利用提供指导。

Coal gasification residues occupy an important proportion in solid waste. Reasonable utilization of coal ash can not only eliminate the hazards of ash, but also save a lot of material resources and turn waste into treasure. The properties and utilization of coal ash are reviewed in this paper. The main components of ash residue are silica, alumina, calcium oxide and carbon residue. The chemical properties of ash are relatively stable and its application is safe. The utilization of ash residue can be divided into low-value, medium-value and high-value applications. At present, there are more low-value and medium-value applications. Combined with the characteristics of the ash in the coal gasification process, the utilization of waste ash is proposed. It can provide guidance for resource utilization of waste ash.