【摘要】 本文从还原模型、固态结构和形态学的角度对“二步熔融还原”中流态化预还原附碳精矿粉的还原机理进行了讨论,提出了附碳精矿粉的“裂化——催化”还原机理,并确定了一种工业上可行的加速还原反应速度的方法,这种方法还能解决流态化还原中常见的粘结现象。采用这种方法可使预还原时间(达到70%还原度)缩短到5分钟,仅为原来的1/3。更多还原

【Abstract】 This paper is a special research of the reduction mechanism of the iron ore concentrate which is adhered by carbon black during its pre-reduction stage by fluidization of two stages smelting reduction process.We investi- gated both the effects of the carbon contents and the reduction temperature levels to the ore reduction rate,respectively.We also put forward the “cracking-catalyzing”mechanism of the carbon-black.So a convenient met- hod for industrial production is prosposed.The adhered carbon black also prevents the concentrate.particales to stick together as its reduced. By used of the prosposed method,the time for reacting 70% pre-reduction degree of the ore is only five minutes,which is only one third of the time needed of the original process.更多还原