Study on Proportioning and Performance of cemented Body from Multi-source Coal-based Solid Waste Based on RSM-BBD Experiment
ZHAO Xinyuan1,2, YANG Ke1,2,3,*, HE Xiang1,2, WEI Zhen1,2, YU Xiang1,2, ZHANG Jiqiang1,2
1 State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology, Huainan 232001, Anhui, China 2 School of Mining Engineering, Anhui University of Science and Technology, Huainan 232001, Anhui, China 3 Institute of Energy, Hefei Comprehensive National Science Center, Hefei 230000, China
Abstract: In this work, the mix proportion of multi-source coal-based solid wastes such as desulfurization gypsum, gasification fine slag and furnace bottom slag was optimized by Box-Behnken Design (BBD) model in response surface methodology (RSM), the mechanical properties, pore structure, thermal stability, and microstructure of the cemented body with the optimal mix proportion were analyzed. The results showed that: (1) the content of gasification fine slag has the greatest influence on the one day strength of the cemented body, the content of desulfurization gypsum has the greatest influence on the three days and seven days strength of the cemented body, and the interaction of the two solid wastes has the most significant influence on the early strength of the cemented body, showing a negative effect; under the condition of mass ratio of 0.4∶1 between fly ash and coal gangue and mass concentration of 80%, the optimal mass mix proportion of desulfurization gypsum, gasification fine slag and furnace bottom slag is 0.2∶0.1∶0.1, and then the compression deformation and failure characteristics of the cemented body with the optimal mix proportion are analyzed. (2) The microscopic characteristics of the cemented body were studied. There are dense and narrow-necked closed pores in the cemented body, with pore diameter ranging from 5 nm to 3.7×105 nm and few micropores, mainly medium and large pores. The endothermic dehydration reaction of free water and crystal water occurs at 55—65 ℃ and 90—120 ℃, the removal of structural water and hydroxyl water and the decomposition of hydration products occur at 600—700 ℃, and the cumulative mass loss at 800 ℃ is about 8%. (3) The hydration reaction in cemented body is mainly cement, and there is no chemical reaction between coal-based solid wastes. The hydration products are a small amount of short rod-shaped ettringite phase and a thin layer of plush C-S-H gel; a small amount of Al3+ in ettringite is replaced by Si4+ and a small amount of SO42- is replaced by CO32-.
通讯作者:
* 杨科,安徽理工大学矿业工程学院教授、博士研究生导师。2015年入选“国家百千万人才工程”;2016年获国务院特殊津贴,2021年入选国家矿山智能化建设专家委员会委员等。目前主要从事多源煤基固废协同利用与绿色开采、煤岩动力灾害监测预警与防控、废弃矿井资源开发与利用、煤炭安全智能精准开采等方面的研究工作。发表论文80余篇,包括《煤炭学报》《岩土力学》、Construction and Building Materials等。yksp2003@163.com
赵新元, 杨科, 何祥, 魏祯, 于祥, 张继强. 基于RSM-BBD的多源煤基固废胶结体配比及性能研究[J]. 材料导报, 2024, 38(9): 22090099-7.
ZHAO Xinyuan, YANG Ke, HE Xiang, WEI Zhen, YU Xiang, ZHANG Jiqiang. Study on Proportioning and Performance of cemented Body from Multi-source Coal-based Solid Waste Based on RSM-BBD Experiment. Materials Reports, 2024, 38(9): 22090099-7.
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2024, Vol. 38 
