When advancing and uncovering coal in roadway, better construction method is vibration shot, metal framework, borehole bleed-off and hydraulic hole, of which vibration shot is principal. 井巷掘进揭煤时,较好的施工方法是震动放炮,金属骨架,钻孔排放和水力冲孔,尤以震动放炮为主。
The exhaust liquor from the domestic lithium manufacture plant recycling lithium contains a large number of aluminum and fluorine ion, was directed bleed-off, because of high cost recovery or other reasons, it will lead to environment pollution and a waste of resource. 国内很多锂业回收锂后的废液中含有大量的铝、氟离子,由于回收成本过高或其它原因而直接排放,造成资源浪费和环境污染。