论文部分内容阅读
采用流化床和马弗炉,进行了流态化还原焙烧与静态堆积焙烧对比实验,前者还原焙烧时间和还原效率明显优于后者.以CO和N2分别作为还原气体和流体介质进行了流态化还原焙烧实验,考察焙烧温度、焙烧时间和还原气氛等对还原效率的影响.在焙烧温度800℃、焙烧时间3 min以及CO体积分数10%时,软锰矿中二氧化锰的还原效率大于97%.在此基础上导出了还原动力学方程,并证实还原过程由界面化学反应控制,求得表观活化能为38.817 kJ.mol-1.
The fluidized bed and muffle furnace were used to carry out the comparative experiments of fluidized reduction roasting and static pile calcination.The former reduced roasting time and reduction efficiency were obviously better than the latter.With CO and N2 as reductant gas and fluid medium respectively State reduction reduction roasting experiments were carried out to investigate the effect of roasting temperature, roasting time and reducing atmosphere on the reduction efficiency. The reduction efficiency of manganese dioxide in pyrolusite was higher than that of roasting temperature 800 ℃, roasting time 3 min and CO concentration 10% 97% .On the basis of this, the reduction kinetics equation was derived and the reduction process was confirmed by the interfacial chemical reaction, the apparent activation energy was 38.817 kJ · mol-1.