实验结果显示，改性后的石膏可提高粉煤灰蒸压硅酸盐制品的强度。

Experiments showed that modified gypsums can improve the strength of fly ash autoclaved silicate products.

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因蒸压法生产高强石膏，尾矿率在20％以上，若丢弃，既浪费资源；增加生产成本，又造成新的环境污染。本文从研究尾矿赋存状态和化学成份着手；

The tailings account for 20 percent in producing the gypsum by the method of if we do not use the tailings again, it must squander the resource, form pollution and increase the productive cost.

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