磷石膏是一种CaSO_4·2H_2O含量很高的细粉,含有P_2O_5和F等杂质,通过洗涤和化学处理都不能完全清除这些杂质.对磷石膏进行高温煅烧,形成硬石膏,将杂质转化成为惰性物质,降低了杂质的危害.试验中比较了煅烧前后杂质含量变化情况,研究了不同激发剂对煅烧后硬石膏产物硬石膏水泥凝结和硬化的影响,以及反应过程中水化作用和结合水之间的关系.通过SEM和XRD分析了硬石膏水泥的微观形成机制.
Phosphogypsum is a powder with high CaSO_4·2H_2O content, The P_2O_5 and F impurities present in phosphogypsum can not be removed completely by washing and chemical treatments. When heated at high temperature, phosphogypsum produced an anhydrite and the impurities became inert and harmless. The effects of different activators on setting and hardening of anhydrite cement was studied. The correlation between hydration and chemically combined water was established. The micro formation mechanism of anhydrite cement was examined by SEM and XRD.
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