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通过试验对高炉瓦斯灰和氧化铁皮制得含碳球团的直接还原进行了研究,考察了不同还原气氛、球团中不同C/O、还原时间、还原温度对还原结果的影响。结果表明:高温下含碳球团在空气中直接还原就能获得很高的金属化率。当球团中C/O在1.2以上时,球团的金属化率在还原过程中一直增加,在1 350℃下还原30 min,球团的金属化率达到96.94%。球团金属化率的变化趋势表明球团在反应开始是由化学反应控速环节控制,而后逐渐向扩散控速环节过渡。在1 400℃下空气中还原30 min,球团中还原出的铁与渣完全分离。
The direct reduction of carbonaceous pellets obtained from blast furnace gas ash and iron oxide scale was studied through experiments. The effects of different reduction atmosphere, different C / O, reduction time and reduction temperature on the reduction results were investigated. The results show that the high rate of metallization can be obtained by direct reduction of carbon-containing pellets in air at high temperature. When the C / O ratio of the pellets is above 1.2, the metallization rate of the pellets increases continuously during the reduction process, and the pellet metallization rate reaches 96.94% after being reduced at 1 350 ℃ for 30 min. The changing trend of the pellet metallization shows that the pellet is controlled by the chemical reaction speed control at the beginning of the reaction and then gradually transitions to the diffusion speed control. Reduction at 1 400 ℃ in the air for 30 min, the iron in the pellets was completely separated from the slag.