The slag from power plants is a mixture of the remainder of the completely burnt coal and the partly burnt coal, which can neither be used as fuel, nor be used as raw material for cement industry.

燃煤火力发电厂炉渣是燃烧完全的灰烬与燃烧不完全的煤块组成的混合物。

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After many grinding mixture ratio tests in laboratories, the paper studies the effect on ordinary cement and slag cement of desulfurized gypsum as cement retarder, instead of raw gypsum.

通过大量的化验室小磨配比试验，研究了脱硫石膏代替天然二水石膏作水泥缓凝剂对普通水泥、矿渣水泥各项性能的影响。

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