(一)前言目前,全国火力发电厂每年排放灰渣量已达三千万吨。其中占半数的灰渣送至贮灰场,排入江河湖海的灰渣约一千万吨,灰渣用于建筑材料仅约三百万吨。但是,就是在这大量被人们认为是“废物”的粉煤灰中,经我们调查研究发现,其中含有一定数量并又具有多种功能的新材料 (I) Foreword At present, the amount of ash discharged from thermal power plants nationwide has reached 30 million tons. About half of the ash is sent to the ash storage yard. The ash discharged into rivers, lakes and seas is about 10 million tons, and the ash is used for building materials only about 3 million tons. However, in this fly ash, which is considered to be “waste” in large quantities, we have found through investigation that there are a number of new materials with multiple functions.