摘要
磷石膏是磷肥生产过程中产生的工业副产品,其产量巨大,但磷石膏中含有酸性物质和重金属等多种杂质会对石膏及其产品的性能产生不利影响,导致磷石膏废弃物资源化利用困难,从而对环境造成严重破坏。本文研究了可溶性氟(氟化钠)对磷石膏砂浆工作性能、力学性能和抗裂性能的影响,结果表明:随着氟化钠掺量的增加,磷石膏砂浆的标准稠度和流动度均呈明显的下降趋势,其初凝时间和终凝时间均显著缩短,其抗折强度和抗压强度总体均呈先减小后增加再减小的趋势;适量添加氟化钠(0.05%~0.08%)能显著改善磷石膏砂浆的工作性能和力学性能,但氟化钠掺量过高(如0.15%)会导致磷石膏砂浆性能下降,特别是在抗折强度和抗压强度方面造成明显的负面影响。因此,精确控制氟化钠的掺量对于优化磷石膏砂浆的综合性能至关重要。
Phosphogypsum is an industrial by-product generated during the production of phosphate fertilizers,with a huge output.However,phosphogypsum contains various impurities,such as acidic substances and heavy metals,which can have adverse effects on the performance of gypsum and its products,leading to difficulties in the resource utilization of phosphogypsum waste and causing serious damage to the environment.This article studies the effect of soluble f luorine(sodium f luoride)on phosphogypsum mortar's workability,mechanical properties,and crack resistance of phosphogypsum mortar.The results show that with the increase of sodium fluoride content,the standard viscosity and f lowability of phosphogypsum mortar show a significant downward trend,and the initial and final setting times are significantly shortened.The overall f lexural strength and compressive strength show a trend of first decreasing,then increasing,and then decreasing again.Moderate addition of sodium f luoride(0.05%~0.08%)can significantly improve the workability and mechanical properties of phosphogypsum mortar,but excessive sodium fluoride content(such as 0.15%)can lead to a decrease in the performance of phosphogypsum mortar,especially in terms of f lexural strength and compressive strength,causing significant negative effects.Therefore,precise control of the dosage of sodium f luoride is crucial for optimizing the comprehensive performance of phosphogypsum mortar.
出处
《混凝土世界》
2025年第4期40-43,共4页
China Concrete
关键词
可溶性氟
磷石膏
标准稠度
凝结时间
力学性能
Soluble fluorine
phosphogypsum
standard viscosity
setting time
mechanical properties
