掺加磷石膏-钢渣对水稳层强度和固废利用影响  

Strength and solid waste utilization analysis of water stability layers with dosing phosphogypsum-steel slag

作　　者：卿三成 王昕 潘社卫 薛广海 王永光 万用波 渠迎锋 卢毅 QING Sancheng;WANG Xin;PAN Shewei;XUE Guanghai;WANG Yongguang;WAN Yongbo;QU Yingfeng;LU Yi(BGRIMM Technology Group,Beijing 100160,China)

机构地区：[1]矿冶科技集团有限公司,北京730900

出　　处：《有色金属（矿山部分）》2024年第5期198-205,共8页NONFERROUS METALS(Mining Section)

基　　金：矿冶科技集团青年基金(04-2320)。

摘　　要：目的:解决工业固废产量高、堆存量大、利用率低的突出问题。方法:本研究基于多固废协同利用设计思路,以炼钢副产物热闷钢渣(SS)和磷化工副产物磷石膏(PG)为主要原料,配合一定比例的天然碎石(NA)和硅酸盐水泥(PC)制备公路工程无机水稳层,对无侧限抗压强度、劈裂强度、体积安定性、抗冲刷等性能进行了可用性测定,并结合X射线衍射、傅里叶变换红外光谱和扫描电子电微镜对其水化过程进行了分析。结果:磷石膏的适量掺加有助于钙矾石生成填充空隙,而掺加过高则会导致石膏裹附在钢渣表面降低骨料间的黏结作用。其中,由6%PG(≤0.30 mm)+6%PC(≤0.30 mm)+32%SS(0.30~4.65 mm)+40%NA(4.65~20.00 mm)+22%SS(4.65~20.00 mm)制备的试件MW-2满足高速公路的极重公路强度标准,固废利用率高达60%。结论:将SS和NA形成级配骨料,将PG和PC用作胶凝材料,可有效提高试件的最大干密度,提高抗压强度,可满足高性能应用需求。意义:该研究充分利用磷石膏的水化特性及钢渣的骨料特征,创新地将磷石膏和钢渣应用于道路生产,探讨出一套级配合理的高强固废基水稳复合材料配方,为固废的高效协同利用提供了新的技术路径,对工业的低碳循环发展具有重要意义。Purpose:To solve the serious problems of high production,large stockpiles,and low utilization in industrial solid wastes.Method:Hot-braised steel slag(SS),a by-product of steel making,and phosphogypsum(PG),a by-product of the phosphorus chemical industry,were taken to prepare inorganic water stability layers for highway engineering as the main raw materials,together with a certain proportion of natural aggregates(NA)and silicate cement(PC),based on the design idea of multi-solid waste synergistic utilisation.Properties such as unconfined compressive strength,splitting strength,bulk stability,and scouring resistance were determined,then the mechanism of the hydration process was characterized by X-ray diffraction(XRD),Fourier transform infrared(FT-IR),and scanning electron electron microscopy(SEM).Result:Proper amount of phosphogypsum helps the generation of ettringite to fill the voids,whereas excess dosage makes gypsum adhereto the surface of the steel slag and reduces the bonding force between the aggregates.Especially,Consisting of 6%PG(≤0.30 mm)+6%PC(≤0.30 mm)+32%SS(0.30-4.65 mm)+40%NA(4.65-20.00 mm)+22%SS(4.65-20.00 mm),layer MW-2 satisfied the high-heavy highway strength criteria,with a solid waste zutilization to 60%.Conclusion:Using SS-NA as graded aggregate and PG-PC as cementitious material can effectively increase the maximum dry density of the layers and improve the compressive strength,which can meet the needs of high-performance applications.Significance:Taking full advantage of the hydration properties of PG and the aggregation properties of SS,a feasible ratios of high-strength water-stable composite was explored for the innovative reuse of PG and SS for road construction,providing a new technological path for efficient and synergetic utilization of solid waste which is important for industrial low-carbon cyclical development.

关 键 词：热闷钢渣 磷石膏 水稳层 级配骨料 胶凝材料 

分 类 号：X75[环境科学与工程—环境工程] TU528[建筑科学—建筑技术科学] TD926.4[矿业工程—选矿]