美国矿业局和美国宾夕法尼亚矿山与矿物工业公司正共同试用飞灰(飞灰即发电厂烧剩的废灰,以下简称废灰)扑灭美国白城附近的矿井火灾,使用效果良好。废灰灭火就是在地面用风泵通过钻孔将干废灰吹入井下巷道,堆成密闭,使巷道与火源隔绝,不让氧气进入火区,使火窒息。用水充填砂、碎石灰岩和粒状矿渣,这早已是一项很有成效的矿井灭火方法。但是它有一个缺点,即充填费用高并且很难取得十分良好的密封性。因此美国想用一种不燃 The United States Department of Mines and the Pennsylvania Mining and Minerals Industries Company are experimenting with fly ash (fly ash, the spent ash left by the power plant, hereinafter referred to as the waste ash), to extinguish a mine fire near the U.S. city of Baicheng and with good results. Ash is extinguishing fire on the ground with a wind pump through the hole to dry ash blowing into the tunnel, piled into airtight, so that the roadway and the source of fire isolated, do not let oxygen into the fire area, the fire suffocation. Filling sand, crushed limestone and granular slag with water has long been a very effective method of mine fire suppression. However, it has the disadvantage that the filling cost is high and it is difficult to achieve a very good seal. Therefore, the United States wants to use a non-flammable substance