可溶性磷酸盐对磷石膏煅烧硬石膏强度发展的影响

IF 10.8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement & concrete composites Pub Date : 2025-01-03 DOI:10.1016/j.cemconcomp.2025.105920

Ying Hua , Zhichao Zhang , Lu Yuan , Jueshi Qian , Yanfei Yue , Zhen Li , Xingwen Jia

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引用次数: 0

摘要

一般认为，不进行预处理，磷石膏中的可溶性磷酸盐会阻碍其利用。本文研究了可溶性磷酸盐对PG经800℃煅烧1小时硬石膏强度发展的积极影响。采用PG、不同可溶性磷酸盐含量水洗PG、水洗PG加水洗水、烟气脱硫石膏（FGD）制备硬石膏。测定了硬石膏的水化程度和强度发展。通过XRD、FTIR、SEM等手段探讨了其作用机理。结果表明，当可溶性P2O5含量从0.7480%下降到0.0471%时，28 d强度从35.9 MPa下降到几乎没有强度；PG中的可溶性磷酸盐会影响硬石膏颗粒的微观结构，促进硬石膏的强度发展，但不影响脱硫后硬石膏的强度。结果表明，PG中的可溶性磷酸盐有利于生产硬石膏，具有广阔的应用前景。

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Effect of soluble phosphate on strength development of anhydrite calcined from phosphogypsum

The soluble phosphates in phosphogypsum (PG) are generally considered to hinder its utilization without pretreatments. This paper investigated the positive effect of soluble phosphates on the strength development of anhydrite calcined from PG at 800 °C for 1 h. PG, washed PG with different soluble phosphate contents, washed PG added with washed water, and flue gas desulfurization gypsum (FGD) were used to prepare anhydrite. The hydration degree and strength development of anhydrite were measured. The effect mechanism was explored by XRD, FTIR, and SEM. Results showed the 28-day strength decreased from 35.9 MPa to almost no strength when the soluble P₂O₅ content decreased from 0.7480 % to 0.0471 %. Soluble phosphates in PG would affect the microstructure of anhydrite particles, promoting the strength development, however, they did not affect the strength of anhydrite calcined from FGD. It is concluded that the soluble phosphates in PG are beneficial for manufacturing anhydrite, which is a promising utilization.

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来源期刊

Cement & concrete composites 工程技术-材料科学：复合

CiteScore

18.70

自引率

11.40%

发文量

459

审稿时长

65 days

期刊介绍： Cement & concrete composites focuses on advancements in cement-concrete composite technology and the production, use, and performance of cement-based construction materials. It covers a wide range of materials, including fiber-reinforced composites, polymer composites, ferrocement, and those incorporating special aggregates or waste materials. Major themes include microstructure, material properties, testing, durability, mechanics, modeling, design, fabrication, and practical applications. The journal welcomes papers on structural behavior, field studies, repair and maintenance, serviceability, and sustainability. It aims to enhance understanding, provide a platform for unconventional materials, promote low-cost energy-saving materials, and bridge the gap between materials science, engineering, and construction. Special issues on emerging topics are also published to encourage collaboration between materials scientists, engineers, designers, and fabricators.