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针对白云鄂博矿含碳球团,利用管式电阻炉研究了炉气温度在900~1 100℃之间球团的还原过程。建立数学模型考虑传热、传质以及化学反应来模拟白云鄂博矿含碳球团直接还原过程。实验结果表明,随着炉气温度的升高,球团质量减小的越快,还原反应结束的时间越短。模拟结果与实验结果吻合较好,随着炉气温度从900℃升高到1 000℃,最终金属化率从63%增加到95%,当炉气温度大于1 000℃时,增加温度对最终金属化率的影响较小;C/O比从0.8增加到1.0时,最终金属化率明显增加,从89%增加到95%,但当C/O比从1.0增加到1.2时,最终金属化率并没有明显增加;随着球团直径从12 mm增加到30 mm时,金属化率升高到最大值的时间从18 min增加到47 min,最终金属化率的值变大但增加不明显。
According to the carbonaceous pellets of Bayan Obo Mine, the reduction process of the pellets with furnace temperature of 900 ~ 1 100 ℃ was studied by using tube resistance furnace. The establishment of mathematical model to consider the heat transfer, mass transfer and chemical reactions to simulate the Bayan Obo carbonaceous pellets direct reduction process. Experimental results show that as the temperature of the furnace gas increases, the mass of the pellet decreases more quickly and the duration of the reduction reaction ends shorter. The simulation results are in good agreement with the experimental results. As the furnace gas temperature increases from 900 ℃ to 1000 ℃, the final metallization rate increases from 63% to 95%. When the furnace gas temperature is above 1000 ℃, The effect of metallization rate was little. When the C / O ratio increased from 0.8 to 1.0, the final metallization rate increased significantly from 89% to 95%. However, when the C / O ratio increased from 1.0 to 1.2, the final metallization The rate of metallization did not increase significantly. As the diameter of the pellet increased from 12 mm to 30 mm, the time for the metallization rate to increase to the maximum increased from 18 min to 47 min, and the final metallization rate increased but did not increase significantly .