模拟流态化CO还原Fe_2O_3微粉的试验研究

Experimental Study on Reduction of Iron Oxide Micro-Powder by CO in Simulating Fluidization State

在可控气氛炉中进行了模拟流态化CO还原Fe2O3微粉的试验研究.采用等温热重分析法,在850～1 050℃考察了温度、CO浓度对模拟流态化Fe2O3微粉还原过程的影响.结果表明：在初始还原阶段反应速率达到最大值,然后快速下降,随后趋于平缓;对不同温度条件下的还原曲线进行对比,950℃时还原效果最佳;在此温度下,进一步研究了CO浓度对还原过程的影响,当CO体积分数由10％提高到30％、50％、100％后,Fe2O3微粉的还原速率逐步提高;30％、50％、100％CO浓度下达到平台期时的还原度均为0.93,而10％CO浓度下达到平台期时的还原度仅为0.25.

To analyze the influences of temperature and carbon monoxide concentration on the reduction process of iron oxide micro-powder in simulating fluidization state within 850-1 050 ℃, the isothermal thermogravimetric ex- periments were conducted in atmosphere furnace. The results show that the reduction rate reaches the maximum in the initial phase, then declines rapidly, and drives to fiat subsequently. Contrasting reduction processes under different temperature conditions, the reduction effect at 950 ℃ is better than others. At 950 ℃, the reduction rate increases as the CO volume fraction increases gradually from 10% to 30%, 50% and 100%, the reduction degree at the stationary region can reach 0.93 when the CO volume fraction is 30%, 50% and 100%, while it is only 0.25 when the CO volume fraction is 10%.