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<p>To develop sustainable, low-carbon carbonaceous materials as alternatives to coal-based coke for blast furnace ironmaking, pine sawdust and lignin were employed as feedstocks. Unlike previous studies that mainly focused on single biomass feedstocks or individual pyrolysis parameters, this work systematically investigates the combined effects of feedstock blending ratio and pyrolysis temperature on the physicochemical properties and carbon structural evolution of bio-coke. Bio-coke was prepared at three representative pyrolysis temperatures (450, 550, and 650&#xa0;°C) using two blending ratios (mass ratios of 3:1 and 2:1). The results demonstrate that increasing lignin content significantly improves the yield, thermal stability, and mechanical strength of the bio-coke. Structural characterization by XRD and Raman spectroscopy reveals that increasing pyrolysis temperature enhances both the long-range stacking order and short-range structural ordering of carbon, indicating progressive graphitization of the carbon matrix. Among the investigated conditions, bio-coke prepared at 550&#xa0;°C exhibited a more uniform porous structure and a chemically stable carbon framework. Under this condition, the bio-coke achieved a yield of 40%, a high heating value of 28.87&#xa0;MJ/kg, and a maximum compressive strength of 5.72&#xa0;MPa, demonstrating its promising potential for blast furnace ironmaking. Furthermore, this study establishes the relationship between carbon structural evolution and the physicochemical properties of bio-coke, providing new insights into optimizing biomass blending strategies and pyrolysis conditions for metallurgical applications. The findings provide theoretical support and practical guidance for the development of high-performance bio-coke as a renewable substitute for conventional metallurgical coke.</p>

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Comparative study of bio-coke prepared from pine sawdust/lignin blends at different pyrolysis temperatures

  • 期刊论文

  • 发表日期：

    2026年7月20日

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  • Lichao Ge,
  • Lei Yao,
  • Hongcui Feng,
  • Ben Yang,
  • Nai Rong,
  • Yanquan Liu,
  • Yang Wang,
  • Chang Xu

摘要

To develop sustainable, low-carbon carbonaceous materials as alternatives to coal-based coke for blast furnace ironmaking, pine sawdust and lignin were employed as feedstocks. Unlike previous studies that mainly focused on single biomass feedstocks or individual pyrolysis parameters, this work systematically investigates the combined effects of feedstock blending ratio and pyrolysis temperature on the physicochemical properties and carbon structural evolution of bio-coke. Bio-coke was prepared at three representative pyrolysis temperatures (450, 550, and 650 °C) using two blending ratios (mass ratios of 3:1 and 2:1). The results demonstrate that increasing lignin content significantly improves the yield, thermal stability, and mechanical strength of the bio-coke. Structural characterization by XRD and Raman spectroscopy reveals that increasing pyrolysis temperature enhances both the long-range stacking order and short-range structural ordering of carbon, indicating progressive graphitization of the carbon matrix. Among the investigated conditions, bio-coke prepared at 550 °C exhibited a more uniform porous structure and a chemically stable carbon framework. Under this condition, the bio-coke achieved a yield of 40%, a high heating value of 28.87 MJ/kg, and a maximum compressive strength of 5.72 MPa, demonstrating its promising potential for blast furnace ironmaking. Furthermore, this study establishes the relationship between carbon structural evolution and the physicochemical properties of bio-coke, providing new insights into optimizing biomass blending strategies and pyrolysis conditions for metallurgical applications. The findings provide theoretical support and practical guidance for the development of high-performance bio-coke as a renewable substitute for conventional metallurgical coke.