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作者在1000～1150℃的温度范围内,进行了碳还原氧化铬的实验,气体为媒质的固-固反应理论能较好地解析实验结果.实验表明:(1)提高还原温度、减小反应物的粒度能明显提高氧化铬的还原速度;(2)氧化铬的还原速度在急增期较大,温度越高这一特征更加显著.数据表明碳还原氧化铬的反应为一级反应,表观活化能为65.33～72.04kcal/mol;(3)经相结构检测还原后的试样中没有发现 Cr_(23)C_6、Cr 和 CrO 存在,1050℃恒温180min 的试样有 Cr_3C_2和 Cr_7C_3存在,而1150℃恒温180min 的试样只有 Cr_7C_3存在.
The experiment of carbon reduction of chromium oxide was carried out in the temperature range from 1000 ℃ to 1150 ℃, and the solid-solid reaction theory of gas as medium can well resolve the experimental results.The experimental results show that: (1) the reduction temperature is increased and the reaction is reduced (2) The reduction rate of chromic oxide is larger in the sharp increase period and the higher the temperature, the characteristic is more significant.The data shows that the reaction of carbon-reduced chromium oxide is first-order reaction, the table (3) No Cr_ (23) C_6, Cr and CrO were detected in the samples after reduction by phase structure examination. There were Cr_3C_2 and Cr_7C_3 in the specimens heated at 1050 ℃ for 180 minutes, However, the samples with a constant temperature of 1150 ℃ for 180min only contain Cr_7C_3.