CAJ | 학술논문

在传热条件一定的前提下,于900～1150℃反应温度范围内进行了热压含碳球团的自还原实验.通过分析热压含碳球团还原失重和产物气体的变化规律,阐述了热压含碳球团的自还原机理.结果表明,热压含碳球团的自还原可用多孔物料反应模型进行描述.整个过程分为两个阶段,第一阶段还原速率明显大于第二阶段.在本研究条件下,热压含碳球团自还原过程两个阶段的限制性环节均为气体通过还原产物层的内扩散.
재전열조건일정적전제하,우900～1150℃반응온도범위내진행료열압함탄구단적자환원실험.통과분석열압함탄구단환원실중화산물기체적변화규률,천술료열압함탄구단적자환원궤리.결과표명,열압함탄구단적자환원가용다공물료반응모형진행묘술.정개과정분위량개계단,제일계단환원속솔명현대우제이계단.재본연구조건하,열압함탄구단자환원과정량개계단적한제성배절균위기체통과환원산물층적내확산.
Corresponding to the ascertained conditions of heat transfer and temperature range of 900～1150℃, self-reduction experiments of carbon composite iron ore hot briquette (CCB) are studied. By analyzing the changes of reduction weightloss and product gases of CCB, self reduction mechanism of CCB is explained. The experimental results show that the self-reduction of CCB in N_2 atmosphere meets homogeneous and porous material model. The whole reduction process could be divided into two stages, the reduction rate during the first stage is significantly faster than that during the second one. In the experimental conditions, the reduction of CCB is controlled by the step of gas inner diffusion through the layer of reduction iron product.