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<p>Cemented paste backfill (CPB) technology has been recognized as an effective approach for managing solid waste accumulation and reducing risks in goaf areas of mining operations. However, the practical application of CPB systems derived from various industrial solid wastes remains constrained by their limited durability. In this investigation, a novel high-strength, durable, and adaptable mine-filling material system was developed through a gradient composite process, utilizing desulfurization of gypsum and slag powder as core multi-source industrial solid wastes. Following optimization of the gradient composite parameters, the prepared slurry demonstrated an improvement of 7.8% in fluidity while exhibiting reduced bleeding characteristics. The system achieved a compressive strength of 44.36&#xa0;MPa, demonstrated 82% water resistance performance, and maintained superior thermal stability under both high- and low-temperature conditions compared with the SAC-FGD benchmark system. Structural characterization revealed that the gradient composite process facilitated progressive formation of hydration products while reducing microcrack development within the matrix, thereby enhancing the mechanical strength characteristics of the CPB. These findings collectively demonstrate that the gradient composite-based CPB technology utilizing industrial solid wastes presents a significant advancement as a green, low-carbon solution for sustainable mining practices.</p>

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Gradient Composite Processing Technology for Multi-Source Industrial Solid Waste Valorization: High-Performance Composite Backfill Materials with Geo-environmental Compatibility

  • 期刊论文

  • 发表日期：

    2025年11月6日

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  • Yuan Zhang,
  • Qingkun Meng,
  • Bin Xiao,
  • Qing Yin,
  • Danyang Zhao,
  • Yanwei Sui,
  • Fuxiang Wei,
  • Wenqing Wei,
  • Hongsheng Tu,
  • Jiqiu Qi

摘要

Cemented paste backfill (CPB) technology has been recognized as an effective approach for managing solid waste accumulation and reducing risks in goaf areas of mining operations. However, the practical application of CPB systems derived from various industrial solid wastes remains constrained by their limited durability. In this investigation, a novel high-strength, durable, and adaptable mine-filling material system was developed through a gradient composite process, utilizing desulfurization of gypsum and slag powder as core multi-source industrial solid wastes. Following optimization of the gradient composite parameters, the prepared slurry demonstrated an improvement of 7.8% in fluidity while exhibiting reduced bleeding characteristics. The system achieved a compressive strength of 44.36 MPa, demonstrated 82% water resistance performance, and maintained superior thermal stability under both high- and low-temperature conditions compared with the SAC-FGD benchmark system. Structural characterization revealed that the gradient composite process facilitated progressive formation of hydration products while reducing microcrack development within the matrix, thereby enhancing the mechanical strength characteristics of the CPB. These findings collectively demonstrate that the gradient composite-based CPB technology utilizing industrial solid wastes presents a significant advancement as a green, low-carbon solution for sustainable mining practices.