Mix proportion and microscopic characterization of coal-based solid waste backfill material based on response surface methodology and multi-objective decision-making

Author:

Zhao Xinyuan,Yang Ke,He Xiang,Wei Zhen,Zhang Jiqiang,Yu Xiang

Abstract

AbstractThe mix proportion of multi-source coal-based solid waste (CSW) for underground backfilling affects transportation and support performance of backfill materials, and even the backfilling cost. In this study, the optimal mix proportion of desulfurization gypsum (DG), furnace bottom slag (FBS) and gasification fine slag (GFS) is determined by the Response Surface Methodology–Box Behnken Design (RSM-BBD). Then the fluidity, bleeding rate, 3-day strength, 7-day strength and preparation cost are evaluation indicators, the optimal mix proportion of backfill materials is determined by the multi-objective decision-making method (MDM). Finally, the microstructure of the backfill material with optimal mix proportion was studied by TGA, MIP, SEM–EDS and XRD. The results show that the mix proportion of CSW with the optimal comprehensive index is coal gangue (CG): coal fly ash (CFA): DG: FBS: GFS = 1:1.5:0.2:0.1:0.1, the mass concentration is 78%, and ordinary Portland cement (OPC)/CSW = 7.5%. The weight loss phenomenon of the backfill material with the optimal mix proportion occurs continuously during the heating process, mainly due to the evaporation of crystal water, structural water and hydroxyl water. There are dense narrow-necked pores in the backfill material, and the pore connectivity is poor. There is no hydration reaction occurs between CSW particles, and the strength increase of the backfill material mainly depends on the hydration reaction of cement. In ettringite, part of Al2O3 is replaced by SiO2, and part of CaSO4 is replaced by CaCO3. This study provides a reference for the engineering application of underground backfilling with multi-source CSW.

Funder

2022 Anhui New Era Education Quality Engineering Project

Anhui Province University Graduate Research Project

National Program on Key Basic Research Project of China

Research Project of Institute of Energy, Hefei Comprehensive National Science Center

Publisher

Springer Science and Business Media LLC

Reference53 articles.

1. Peng, S. P. & Bi, Y. L. Strategic consideration and core technology about environmental ecological restoration in coal mine areas in the Yellow River basin of China. J. China Coal Soc. 45, 1211–1221 (2020).

2. Yang, K., Zhao, X., He, X. & Wei, Z. Basic theory and key technology of multi-source coal-based solid waste for green backfilling. J. China Coal Soc. 47, 4201–4216 (2022).

3. Huang, Y. L., Wang, W. F. & Bian, Z. F. Prospects of resource utilization and disposal of coal-based solid wastes in Xinjiang. Coal Sci. Technol. 49, 319–330 (2021).

4. Yang, K., Zhao, X., Wei, Z. & Zhang, J. Development overview of paste backfill technology in China’s coal mines: A review. Environ. Sci. Pollut. Res. 28, 67957–67969. https://doi.org/10.1007/s11356-021-16940-6 (2021).

5. Bekezhanov, D., Nurmukhankyzy, D., Tinistanova, S., Kopbassarova, G. & Zhangushukova, A. Legal and environmental policy on solid waste pollution and protection. Environ. Policy Law 48, 83–88. https://doi.org/10.3233/EPL-180053 (2018).

Cited by 1 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3