目前,我国火力发电厂的年排灰量约4000万吨,到本世纪末全国粉煤灰的排放量预计可达4亿多吨,其数量之大十分惊人,如果不早日妥善而有效地治理,不仅要侵占大量土地,而且对环境污染更是不堪设想。为了把该工业固体废物再资源化,各国都积极致力于探索粉煤灰的综合利用。据1977年资料介绍各国粉煤灰利用率如表1所示。 At present, the annual power ash discharge of thermal power plants in China is about 40 million tons. By the end of this century, the amount of fly ash emissions in the country is expected to reach over 400 million tons. The magnitude of the fly ash is quite staggering. If not properly and effectively managed, Not only to occupy a large amount of land, but also the environmental pollution is even more disastrous. In order to recycle the industrial solid waste, all countries are actively committed to exploring the comprehensive utilization of fly ash. According to the 1977 information on the utilization of fly ash in various countries as shown in Table 1.