摘要
采空区自燃是煤炭开采中面临的重大灾害之一,不仅会浪费煤炭资源、造成大量经济损失,还会引发事故导致人员伤亡。为了减少氧气向采空区泄漏,常常沿采空区侧煤壁喷涂堵漏风材料,以封堵因采掘活动产生的煤壁裂隙。以水泥-粉煤灰为基体材料,用羟丙基甲基纤维素(HPMC)和磷酸三丁酯(TBP)共同改性制备新型喷涂堵漏风材料。通过析水率测试、保水率测试、力学性能测试和水泥基材料与煤界面接触角测试,得出了不同掺量的HPMC和TBP对涂层性能的影响。试验结果表明,当水固比为0.5、粉煤灰掺量为20%、HPMC掺量为0.2%、TBP掺量为0.08%时,材料综合性能最佳。浆液析水率低于5%,材料7d抗压强度和抗折强度可分别达到16.70MPa和5.02MPa,相比于纯水泥-粉煤灰材料提高了6.57%和2.87%,改性后浆液与煤的初始接触角降低了21.83°。最终,根据X射线衍射分析、傅里叶红外光谱分析和扫描电子显微镜分析,得出了外加剂对水泥水化机理及微观结构的影响。
Spontaneous combustion of coal in goaf is one of the major disasters faced in coal mining.It not only wastes coal resources,causes significant economic losses,but also leads to accidents and casualties.To minimize the leakage of oxygen into the goaf,gas-sealing materials are frequently sprayed on the coal wall adjacent to the goaf,aiming to seal the coal wall cracks generated by mining activities.A new type of sprayed gas-sealing material was prepared by modifying cement-fly ash as matrix materials with hydroxypropyl methyl cellulose(HPMC)and tributyl phosphate(TBP).The effects of different contents of HPMC and TBP on the coating properties were derived from the water precipitation rate tests,water retention rate tests,mechanical strength tests and contact angle tests of cement-based material and coal interface.The tests results show that the best comprehensive performance of the material can be achieved when the water-solid ratio is 0.5,the content of fly ash is 20%,the content of HPMC is 0.2%and the content of TBP is 0.08%.When the water precipitation rate of the slurry is lower than 5%,the 7dcompressive strength and flexural strength of the material can reach 16.70MPa and 5.02MPa,respectively,which are increased by 6.58%and 2.87%compared with the pure cement-fly ash material.After modification,the initial contact angle between the slurry and the coal is reduced by 21.83°.Finally,the effect of admixtures on the hydration mechanism and microstructure of cement was derived from X-ray diffraction analysis,Fourier infrared spectrum analysis and scanning electron microscope analysis.
作者
王桐
孟祥豹
张延松
刘丽
吴阳
石磊
吴琦岩
WANG Tong;MENG Xiangbao;ZHANG Yansong;LIU Li;WU Yang;SHI Lei;WU Qiyan(College of Safety and Environmental Engineering,Shandong University of Science and Technology,Qingdao,Shandong 266590,China;Key Laboratory of Mining Disaster Prevention and Control,Qingdao,Shandong 266590,China;Qingdao Intelligent Control Engineering Center for Production Safety Fire Accident,Qingdao,Shandong 266590,China)
出处
《矿业研究与开发》
CAS
北大核心
2024年第3期225-231,共7页
Mining Research and Development
基金
国家自然科学基金项目(51974179).
关键词
新型喷涂堵漏风材料
采空区自燃
水泥-粉煤灰基材料
羟丙基甲基纤维素
磷酸三丁酯
New sprayed gas-sealing material
Spontaneous combustion in goaf
Cement-fly ash based material
Hydroxypropyl methyl cellulose
Tributyl phosphate
