Preparing insulation materials from biomass waste is an economic and effective method of resource utilization. In this work, an eco-friendly sawdust composite insulation material was produced with its fire resistance improved by torrefying the biomass and adopting fireproof geopolymers as inorganic binders. Raw sawdust, as the fire-proof weakness, was torrefied to increase the ignition point before being added to the biomass composite insulation materials. With the increase of torrefaction temperature or residence time, the ignition point of the torrefied sawdust increased from 270 °C to 360 °C when the solid yield decreased from 95 % to 34 % For the sawdust composite insulation materials, the best comprehensive performance was achieved with the solid yield of torrefied sawdust being 60 %, and the corresponding values of thermal conductivity, density, and compression strength were 0.087 W/(m.K), 430.8 kg/m³ and 0.97 MPa, respectively. Furthermore, the composite insulation materials can maintain structural integrity under high-temperature flame spraying and obtain a satisfactory carbon sequestration capacity. Due to the advantages of environmental protection, high fire resistance, and low thermal conductivity, the torrefied sawdust composite insulation material has good application prospects in buildings.

用生物质废弃物制备保温材料是一种经济有效的资源利用方法。在这项工作中，通过对生物质进行烘烤，并采用防火地质聚合物作为无机粘合剂，生产了一种环保的木屑复合保温材料，其耐火性得到了提高。生木屑作为防火弱点，在添加到生物质复合保温材料之前，先经过烘烤以提高燃点。随着烘烤温度或停留时间的增加，木屑的燃点由270℃升高到360℃，固体产率从95%下降到34%，木屑复合保温材料综合性能最佳木屑的固体收率为60%，相应的导热系数值，分别为³和 0.97 MPa。此外，复合保温材料在高温火焰喷涂下仍能保持结构完整性，并获得令人满意的固碳能力。由于具有环保、耐火性高、导热系数低等优点，干燥木屑复合保温材料在建筑中具有良好的应用前景。