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露天矿里的大气与通向井下的空气不同,通向井下的空气流在流动过程中其成分变化很大,而露天矿里的大气成分较稳定。只有当露天矿里的大气被有害气体和粉尘严重污染时,其成分才发生变化,氧含量稍减少,二氧化碳和有毒气体含量增加。露天矿大气污染源主要是柴油机车产生的有毒气体,煤的自然发火,以及在挖掘过程中自然析出的气体,或从地下水层中涌出被污染。
The atmosphere in the open pit is different from the air leading to the downhole. The air flow to the well varies greatly in its composition while the atmospheric composition in the open pit is relatively stable. Only when the atmosphere in the open pit is heavily polluted by harmful gases and dusts, its composition changes only slightly, the oxygen content decreases slightly, and the content of carbon dioxide and toxic gas increases. Open air mine air pollution sources are mainly toxic gas generated by diesel locomotives, spontaneous combustion of coal, as well as the natural gas during the excavation process, or from the groundwater gushing polluted.