Application of thermal insulation wall surface coatings in underground mines

Geothermal heat transfer from the surrounding rock to the air causes a substantial rise in temperature with increasing depth, posing a significant thermal challenge in underground mining operations. Managing this heat currently demands extensive maintenance and mitigation efforts, driving up operational costs and contributing to higher greenhouse gas emissions. This study investigates the potential of innovative thermal insulation coatings made from cement-treated waste plastics to mitigate heat transfer and improve underground thermal conditions. Heat simulation analysis reveals that the proposed mix—designated 9C_12HDPE, composed of soil, 9 % cement (C), and 12 % recycled high-density polyethylene (HDPE)—effectively reduces heat transfer, thereby enhancing the thermal environment in deep mining settings. In addition to thermal benefits, the 9C_12HDPE insulation mix provides significant economic and environmental advantages. It offers up to a 36 % cost reduction compared to conventional shotcrete, while sustainability analysis indicates a global warming potential (GWP) reduction of up to 61 %. These results highlight the promise of 9C_12HDPE coatings in not only improving miner safety and comfort but also in reducing energy consumption and advancing sustainability in underground mining operations.