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Volume 31 Issue 1
Jan.  2024
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文章导航 >  矿物冶金与材料学报（英文）  > 2024  >  31(1): 60-70
Hai Li, Aibing Jin, Shuaijun Chen, Yiqing Zhao, and You Ju, Paraffin–CaCl2·6H2O dosage effects on the strength and heat transfer characteristics of cemented tailings backfill, Int. J. Miner. Metall. Mater., 31(2024), No. 1, pp. 60-70. https://doi.org/10.1007/s12613-023-2700-z
Cite this article as:
Hai Li, Aibing Jin, Shuaijun Chen, Yiqing Zhao, and You Ju, Paraffin–CaCl2·6H2O dosage effects on the strength and heat transfer characteristics of cemented tailings backfill, Int. J. Miner. Metall. Mater., 31(2024), No. 1, pp. 60-70. https://doi.org/10.1007/s12613-023-2700-z
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研究论文

石蜡–CaCl2·6H2O添加量对充填体强度和传热特性的影响

  • 1)

    北京科技大学, 金属矿山高效开采与安全教育部重点实验室, 北京 100083, 中国

  • 2)

    北京科技大学, 土木与资源工程学院, 北京 100083, 中国


  • 通讯作者:

    金爱兵    E-mail: jinaibing@ustb.edu.cn

    赵怡晴    E-mail: zyq@ustb.edu.cn

文章亮点

  • (1) 为水合盐类型相变材料用于充填采矿降低深井温度提供了新的思路。
  • (2) 推导了石蜡–CaCl2·6H2O不同复合比例导热系数的计算公式，并从微观角度解释导热系数变化机理。
  • (3) 提出“焓–质配比法”计算非反应型复合PCM的相变潜热。
  • 深井采矿中的高温问题一直是影响工作人员身体健康和生产效率的有害因素，而将相变材料(phase change material, PCM)加入充填料浆中，利用相变材料蓄冷功能降低井下温度，是一种缓解井下高温问题的有效途径。通过室内试验制备石蜡–CaCl2·6H2O复合相变材料，研究新型材料的组成成分、相变潜热以及导热系数，并利用FLUENT软件，模拟PCM的传热特性和加入充填体后的吸热效果得出以下结论。(1) 新型石蜡–CaCl2·6H2O复合材料不仅提高了石蜡的导热系数而且克服了CaCl2·6H2O易溶于水的缺点，两种PCM复合后可优势互补。(2) 推导了石蜡与CaCl2·6H2O复合后新材料的导热系数的计算公式，并从微观上解释了导热系数变化原理。(3) 提出“焓–质配比法”计算非反应型复合PCM的相变潜热。(4) 充填体中添加石蜡–CaCl2·6H2O虽然降低了抗压强度，但提高了其吸热能力，这项研究可为绿色矿山中使用蓄热回填材料提供理论依据。
    • Research Article

    Paraffin–CaCl2·6H2O dosage effects on the strength and heat transfer characteristics of cemented tailings backfill

    + Author Affiliations
      Abstract
    • The challenge of high temperatures in deep mining remains harmful to the health of workers and their production efficiency. The addition of phase change materials (PCMs) to filling slurry and the use of the cold storage function of these materials to reduce downhole temperatures is an effective approach to alleviate the aforementioned problem. Paraffin–CaCl2·6H2O composite PCM was prepared in the laboratory. The composition, phase change latent heat, thermal conductivity, and cemented tailing backfill (CTB) compressive strength of the new material were studied. The heat transfer characteristics and endothermic effect of the PCM were simulated using Fluent software. The results showed the following: (1) The new paraffin–CaCl2·6H2O composite PCM improved the thermal conductivity of native paraffin while avoiding the water solubility of CaCl2·6H2O. (2) The calculation formula of the thermal conductivity of CaCl2·6H2O combined with paraffin was deduced, and the reasons were explained in principle. (3) The “enthalpy–mass scale model” was applied to calculate the phase change latent heat of nonreactive composite PCMs. (4) The addition of the paraffin–CaCl2·6H2O composite PCM reduced the CTB strength but increased its heat absorption capacity. This research can give a theoretical foundation for the use of heat storage backfill in green mines.
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