以生物质核桃壳为原料制备生物质炭还原剂，对其进行了表征，分析了焦炭化学成分、官能团分布等与电阻率的关系. 结果表明，热解温度从400℃增加到1450℃时，生物质炭的电阻率从6288.7 mW×m减小至1515.9 mW×m，固定碳含量增加，挥发分含量减小；随热解温度升高，其羰基和脂肪族官能团逐渐被破坏，炭晶面间距d002逐渐减小，结晶度、芳构化程度和有序化程度增强. 在500~700℃的热解温度下所得生物质炭产率≥24%，电阻率≥5800 mW×m，固定碳≥80%，灰分≤4%，且具有发达的孔隙，可用作工业硅生产炭质还原剂.

Bio-char reductant was prepared with walnut shells, and characterized to analyze the relationship between chemical components, functional group distribution and resistivity. The results showed that resistivity of bio-char declined from 6288.7 to 1515.9 mW×m with increasing of pyrolysis temperature from 400℃ to 1450℃. Fixed carbon content increased and volatile matter content declined with increasing of pyrolysis temperature. Carbonyl and aliphatic functional groups in the char were gradually decomposed, the interlamellar spacing of d002 on the lattice plane decreased gradually, its crystallinity, aromatization and carbon structure ordering degree increased with increasing of pyrolysis temperature. In the pyrolysis temperature range of 500~700℃, high-performance bio-char reductant with high yield (≥24%), high resistivity (≥5800 mW×m), high fixed carbon content (≥80%) and low ash content (≤4%) was obtained. The char had developed pores, and could be used as the reductant for industrial silicon production.