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基于胶结膏体回填水洗预处理的磷石膏原位修复：流变行为与损伤演化

In Situ Remediation of Phosphogypsum with Water-Washing Pre-Treatment Using Cemented Paste Backfill: Rheology Behavior and Damage Evolution.

作者信息

Liu Yikai, Chen Qiusong, Wang Yunmin, Zhang Qinli, Li Hongpeng, Jiang Chaoyu, Qi Chongchong

机构信息

Department of Geosciences, University of Padova, 35131 Padova, Italy.

Sinosteel Maanshan General Institute of Mining Research Co., Ltd., Maanshan 243000, China.

出版信息

Materials (Basel). 2021 Nov 18;14(22):6993. doi: 10.3390/ma14226993.

DOI:10.3390/ma14226993
PMID:34832394
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8618653/
Abstract

The accumulation of original phosphogypsum (OPG) has occupied considerable land resources, which have induced significant environmental problems worldwide. The OPG-based cemented paste backfill (OCPB) has been introduced as a promising solution. In this study, a water-washing pre-treatment was used to purify OPG, aiming to optimize the transport performance and mechanical properties of backfills. The overall results proved that in treated phosphogypsum-based cemented paste backfill (TCPB), the altered particle size distribution can alleviate the shear-thinning characteristic. The mechanical properties were significantly optimized, of which a maximum increase of 183% of stress value was observed. With more pronounced AE signals, the TCPB samples demonstrated better residual structures after the ultimate strength values but with more unstable cracks with high amplitude generated during loading. Principal component analysis confirmed the adverse effects of fluorine and phosphorus on the damage fractal dimensions. The most voluminous hydration products observed were amorphous CSH and ettringite. The interlocked stellate clusters may be associated with the residual structure and the after-peak AE events evident in TCPB, indicate that more significant stress should be applied to break the closely interlocked stitches. Ultimately, the essential findings in this experimental work can provide a scientific reference for efficient OPG recycling.

摘要

原始磷石膏（OPG）的堆积占用了大量土地资源，在全球范围内引发了严重的环境问题。基于OPG的胶结膏体回填材料（OCPB）已被视为一种有前景的解决方案。在本研究中，采用水洗预处理来净化OPG，旨在优化回填材料的输送性能和力学性能。总体结果表明，在经过处理的磷石膏基胶结膏体回填材料（TCPB）中，改变后的粒度分布可减轻剪切变稀特性。力学性能得到显著优化，应力值最大增加了183%。随着声发射（AE）信号更为明显，TCPB样品在达到极限强度值后显示出更好的残余结构，但在加载过程中会产生更多高幅值的不稳定裂缝。主成分分析证实了氟和磷对损伤分形维数的不利影响。观察到的最主要水化产物是无定形CSH和钙矾石。相互连锁的星状聚集体可能与TCPB中明显的残余结构和峰值后AE事件有关，这表明需要施加更大的应力来破坏紧密连锁的结构。最终，本实验工作的重要发现可为OPG的高效回收利用提供科学参考。

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