【摘要】 本文以X-射线衍射分析、扫描电镜分析等方法研究大理石抛光粉处理硫化工酸性废水,并利用所得的副产品石膏作为水泥调凝剂。研究结果表明,用大理石抛光废粉作为处理硫化工酸性废水的一级中和剂,再以石灰或电石渣作为二级处理中和剂的工艺较为合适;以该工艺所得的副产品石膏除二水石膏外,还含有经废酸活化的细碳酸钙颗粒;利用其配制的普通水泥与二水石膏配制的普通水泥相比,标准稠度用水量略增加,凝结时间略缩短,胶砂强度略提高。利用大理石抛光粉处理硫化工废水副产品石膏作水泥调凝剂有利于循环经济。更多还原

【Abstract】 It was studied in the paper by XRD and SEM that the new two stages treatment processing technology of sulfur chemicals wastewater by marble polishing powder and lime, and the effect of the properties of by-product gypsum from the processing as the retarder of cement. The results showed that:The marble polishing powder was the first neutralizer.It’s proper that the lime or carbide slag was the second neutralizer. The strength of ordinary Portland cement mixed by-product gypsum as retarder was higher than that of the ordinary Portland cement using dihydrate gypsum as retarder, because the calcium carbonate in the by-product gypsum would participate in the hydration reaction and form the calcium aluminum oxide carbonate hydrate, which was helpful to improve the cement strength during the cement hydrated reaction.更多还原