基于分形理论建立了矿煤球团还原动力学新模型,通过钒钛磁铁精矿内配煤球团加热还原试验,探讨钒钛磁铁精矿内配煤球团分形还原机理.实验结果发现,钒钛磁铁精矿表面分维为2.2686;实验温度范围(960～1200℃)内,球团还原时间短于23 min时,其表观速率常数与温度之间关系为k1=624.843exp(-1.5324×104/T)min-1,活化能为127.40kj·mol-1;球团还原时间超过28 min后,其表观速率常数与温度之间关系为k2=0.035×exp(-0.5329×104/T) min-1,活化能为44.31kJ·mol-1.结果表明,球团还原初期主要受碳气化反应限制,后期主要受内扩散限制.
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