为更好地利用磷石膏资源,发挥磷石膏的最大价值,以磷建筑石膏粉为原料,通过化学成分计算,合理调配其中的二水石膏、硬石膏和半水石膏含量,引入可溶性五氧化二磷、氟化钠、氯化钠来调整其中的水溶性五氧化二磷、水溶性氟离子和氯离子含量,通过对凝结时间和力学性能的测试来研究相组成和杂质含量对其性能的影响。结果表明：二水石膏质量分数低于3%时会加速建筑石膏的水化反应、增强其早期强度,半水石膏质量分数在77%左右时建筑石膏的力学性能较好,无水石膏质量分数超过15%时建筑石膏的力学性能下降较大;当利用磷石膏制备建筑石膏粉时,水溶性五氧化二磷质量分数宜控制在0.2%以下,水溶性氟离子质量分数宜控制在0.3%以下,氯离子质量分数宜控制在0.04%以下。从相组成和杂质控制的角度,该研究为磷石膏的资源化利用提供了借鉴和参考,有助于提升中国磷石膏的利用水平。

In order to make better use of phosphogypsum resources and paly its utmost value,using phosphogypsum powder as raw material,the content of dihydrate gypsum,anhydrite and hemihydrate gypsum were reasonably allocated after calculating the chemical composition,the content of water-soluble P₂O₅,water-soluble F^- and Cl^- were adjusted by introducing soluble P₂O₅,NaF and NaCl.The effect of phase composition and impurity content on its properties was studied by testing the setting time and mechanical properties.The results showed that when the mass fraction of dihydrate gypsum was lower than 3%,the hydration reaction of building gypsum would be accelerated,and its early strength effect could be enhanced.When the mass fraction of hemihydrate gypsum was about 77%,its mechanical properties would be better,and when the mass fraction of an-hydrite was more than 15%,its mechanical properties would decrease greatly.When building gypsum powder was prepared from phosphogypsum,the mass fraction of water-soluble P₂O₅,water-soluble F^- and Cl^- should be controlled below 0.2%,0.3% and 0.04%,respectively.From the perspective of phase composition and impurity control,this paper provides reference for the resource utilization of phosphogypsum and helps to improve the utilization level of phosphogypsum in China.