When the seam was extracted, water from the sand layer penetrated into some coal faces.
煤层开采后，一些工作面出现了砂层水渗入井下的现象。
Loose covering layer that consisted of water containing fine powder sand layer was encountered in the overcasting at Zhaodianzi Iron Mine.
赵店子铁矿在露天开采中遇到了含有含水粉细沙层的松散覆盖层。
It can remove the gravel covered surface impurities, while destruction of water vapor coated layer of sand to facilitate the dehydration, the role played efficient washing sand cleaning.
它能除去覆盖砂石表面的杂质，同时破坏包覆砂粒的水汽层，以利于脱水，起到高效洗砂清洗作用。
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