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采用自主研制的小型旋转床反应器,结合化学分析和X射线衍射分析等技术对CO还原澳大利亚PB粉进行了直接还原实验研究。结果表明:CO流量为200 mL/min,矿粉粒径范围为0.044~0.089 mm,还原时间为60 min,还原温度为1 000℃时,还原产物还原度和金属化率达到最大值,分别为92.70%和86.28%;在700~1 000℃内基于收缩未反应核模型对澳大利亚PB粉还原反应进行动力学分析,得出反应前期(t<30 min)还原过程由气体内扩散和界面化学反应混合控制;反应后期(t>30 min)还原反应的限制性环节为气体内扩散,指前因子A为0.006 72 s~(-1),表观活化能E为10.043 kJ/mol。
A small rotary bed reactor developed by ourselves was used to study the reduction of PB powder in Australia by CO reduction and X-ray diffraction analysis. The results show that when the flow rate of CO is 200 mL / min, the size range of ore powder is 0.044 ~ 0.089 mm, the reduction time is 60 min and the reduction temperature is 1 000 ℃, the reduction degree and metallization rate of the reduction products reach the maximum 92.70% and 86.28% respectively. The kinetic analysis of the reduction reaction of PB powder in Australia based on the contracted and unreacted nuclear model at 700-1000 ℃ showed that the reduction reaction was initiated by gas diffusion and interfacial chemical reaction (T> 30 min). The limiting factor for the reduction reaction was gas diffusion. The pre-exponential factor A was 0.006 72 s -1 and the apparent activation energy E was 10.043 kJ / mol.