粉煤灰是火力发电厂用磨细的煤灰在锅炉炉膛中燃烧后剩下的残渣,由除尘器里收集下来的粉尘。据统计,使用一般燃煤,发一度电约排灰30～300克。1979年我国仅以发电量五万千瓦以上的烧煤电厂计算,每年排灰总量达三千多万吨。这些工业废渣排入江河湖泊,淤塞河道;排入大气,污染空 Fly ash is the residue left behind by the burning of fine coal ash in a boiler furnace in a thermal power plant, and the dust collected by the dust collector. According to statistics, the use of general coal-fired power generation is about 30 to 300 grams of ash. In 1979, China only calculated coal-fired power plants with a power generation capacity of more than 50,000 kilowatts, and the total amount of ash discharged every year reached more than 30 million tons. These industrial wastes are discharged into rivers and lakes to block river channels; they are discharged into the atmosphere, polluting the air