粉煤灰资源特性及其高附加值综合利用研究分析

Research on resource character and value-added synthetic utilization of fly ash

粉煤灰是排放量最大的工业废渣,对其进行高附加值资源化综合利用对我国经济和环境具有重要的意义．至今对粉煤灰的利用研究已经取得了很多成果,但大多都是用于建筑材料工业中．尚有大部分粉煤灰未加利用,或被填埋或被堆放．而堆放和填埋粉煤灰需要占用大量可耕地和付出较高维护费用,长期的堆放还会造成大气污染和地下水系污染,给社会带来严重的经济和环境问题．近来的研究表明,粉煤灰除了可作为低附加值用于传统的建筑材料外,还可作为高附加值用于耐火隔热材料、污水治理、钢铁冶炼晶粒细化与阻氧覆盖、氧化铝溶出回收及其它功能材料中．

Fly ash is the largest amount of industrial residue. The synthetic utilization of fly ash has an important significance for economy and environment in China. Nowadays there are lots of achievements in the utilization of fly ash. A relatively small percentage of the material finds application as an ingredient in cement and other construction products, but the majority of material generated each year is held in ash dams or similar dumps. This unproductive use of land and the associated long-term financial burden of maintenance have led to realization that alternative uses for fly ash as a value-added product beyond incorporation in construction materials are needed. Utilization of fly ash in such areas as refractory, waste water treatment, refining and grain refinement composite material used for steel, recovery of A12 03 and other functional materials is reviewed with the aim of looking at new areas that will expand the positive reuse of fly ash, thereby helping to reduce the environmental and economic impacts of disposal.