张鹏辉,张茂微,吴锐,等. 神东矿区新型无机膏体防灭火充填材料制备及性能研究[J]. 煤矿安全,2024,55(6):100−110. doi: 10.13347/j.cnki.mkaq.20231202
    引用本文: 张鹏辉,张茂微,吴锐,等. 神东矿区新型无机膏体防灭火充填材料制备及性能研究[J]. 煤矿安全,2024,55(6):100−110. doi: 10.13347/j.cnki.mkaq.20231202
    ZHANG Penghui, ZHANG Maowei, WU Rui, et al. Research on preparation and performance of a new type of inorganic paste fire preventing and extinguishing filling material in Shendong Mining Area[J]. Safety in Coal Mines, 2024, 55(6): 100−110. doi: 10.13347/j.cnki.mkaq.20231202
    Citation: ZHANG Penghui, ZHANG Maowei, WU Rui, et al. Research on preparation and performance of a new type of inorganic paste fire preventing and extinguishing filling material in Shendong Mining Area[J]. Safety in Coal Mines, 2024, 55(6): 100−110. doi: 10.13347/j.cnki.mkaq.20231202

    神东矿区新型无机膏体防灭火充填材料制备及性能研究

    Research on preparation and performance of a new type of inorganic paste fire preventing and extinguishing filling material in Shendong Mining Area

    • 摘要: 为解决神东矿区回采工作面两端巷道附近采空区遗煤多、易自燃、难封堵的难题,提出一种新型无机膏体防灭火充填材料,高效快速充填回采工作面上下隅角。采用神东矿区附近易获取的粉煤灰、炉渣和P·O·42.5硅酸盐水泥作为膏体主要原料,通过室内实验对材料的物理性质和化学成分进行研究,并通过膏体流动性、凝固特性、膨胀特性、充填体强度测试实验,确定出膏体最佳材料配比及外加剂参量。实验结果表明:炉渣基膏体具有良好自膨胀性,7 d自膨胀率可达5.6%,且初凝时间短,满足工程所需强度要求;膏体防灭火材料的最佳配比方案为水泥∶粉煤灰∶炉渣=1∶4∶20,质量分数为78%,J85型速凝剂的添加量为6%。工程应用表明:采用优选的膏体充填材料进行隅角充填封堵后,采空区漏风量整体下降至充填前的30%,CO体积分数从120×10−6降至46.5×10−6,O2体积分数在深入采空区走向长度约80 m处降至10%以下,采空区内“散热带+氧化带”的走向长度由未充填前的160 m缩短为80 m。

       

      Abstract: In order to solve the problem of many coal remains, easy to spontaneous combustion and difficult to be sealed in the goaf near the two ends of roadway of the working face in Shendong Mining Area, this paper proposes a new type of inorganic paste fire preventing and extinguishing filling material, which can efficiently and quickly fill the upper and lower corners of the working face. Fly ash, slag and P·O·42.5 silicate cement, which are easily accessible in the vicinity of Shendong Mining Area, are used as the main raw materials of the paste, and the physical properties and chemical compositions of the materials are investigated through indoor tests, and the optimal ratio of the paste and the amount of additives are determined through the paste liquidity test, the paste solidification test, the paste expansion test and the paste filling strength test. The test results show that: the slag base paste has good self-expansion, the self-expansion rate can reach 5.6% in 7 days, and the initial setting time is short, which can meet the strength requirements of the project. The best proportioning scheme of the paste fireproofing material is cement : fly ash : slag = 1 : 4 : 20, and the mass fraction is 78%, and the addition amount of J85 accelerator is 6%. The engineering application shows that, after using the preferred paste filling material for corner filling and sealing, the air leakage in the mining airspace is reduced to 30% of that before filling, the CO volume fraction is reduced from 120×10−6 to 46.5×10−6, the O2 volume fraction is reduced to less than 10% at a point of about 80 m in depth of the strike length of the mining area, and the strike length of the dispersion zone + oxidation zone in the goaf is shortened from 160 m before filling to 80 m.

       

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