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基于转底炉直接还原工艺,比较了转炉细灰与膨润土、有机粘结剂对含碳球团生球落下强度的影响。发现配加20%转炉细灰与配加6%膨润土造球效果相近,可用其替代膨润土。在含碳球团中配加转炉细灰,通过单因素试验研究了转炉细灰配加量、水分、成型压力、配碳量对生球落下强度的影响,并采用正交试验对影响的程度进行了分析。结果表明:随着成型压力、水分和转炉细灰配加量的增大,生球落下强度先升高后降低;随着配碳量增加,生球落下强度逐渐降低;最佳工艺参数组合为水分15%、压力15MPa、C/O为0.8、转炉细灰配入量为25%。可行性分析认为,在含碳球团中配加转炉细灰是高效利用转炉细灰的可行途径。
Based on the direct reduction process of rotary hearth furnace, the effects of fly ash, bentonite and organic binder on the falling strength of green balls containing carbon pellets were compared. It was found that adding 20% converter fine ash and adding 6% bentonite pelleting effect is similar, can be used instead of bentonite. In the carbonaceous pellets with the addition of fine ash converter, through the single factor test to study the effect of the ash content, moisture content, forming pressure and carbon content on the falling strength of the green balls, and orthogonal experiment was used to evaluate the degree of influence Analyzed. The results showed that with the increase of forming pressure, moisture content and the amount of fine ash in converter, the dropping strength of green ball first increased and then decreased. With the increase of carbon content, the dropping strength of green ball decreased gradually. The best combination of process parameters was Moisture 15%, pressure 15MPa, C / O is 0.8, the converter fine ash content of 25%. Feasibility analysis shows that adding carbonaceous pellets with fine ash converter is a viable way to effectively use the converter fine ash.