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将球团矿分别在900℃恒温和升温试验条件下还原,研究了球团矿的还原膨胀行为;分析了2种温度条件下球团膨胀机理;对比了2种条件下的试验结果,观察分析了还原后球团的外观和微观组织形貌,得到了导致2种温度条件下球团膨胀差异的原因。研究结果表明:恒温还原球团的最大膨胀值为18.3%,升温还原时为8.3%,恒温还原球团的膨胀行为更加明显;裂纹和气孔的形成以及金属铁的析出形态差异是造成膨胀差异的主要原因。由此得出,为了得到与实际生产相近的还原膨胀行为,球团矿应该在升温条件或模拟的生产条件下进行还原试验。
The pellets were respectively reduced at constant temperature and elevated temperature of 900 ℃. The reduction and expansion behavior of the pellets was investigated. The mechanism of pellets expansion under two different temperatures was analyzed. The experimental results under two different conditions were compared and observed. After the reduction of the pellet appearance and microstructure morphology, resulting in two kinds of temperature conditions, the reasons for the differences in pellet expansion. The results show that the maximum swelling value of the pellet is 18.3%, the reduction is 8.3% when the temperature is reduced, and the swelling behavior of the pellet is more obvious. The formation of cracks and pores and the precipitation of metal iron are the differences of swelling main reason. It is concluded that pellets should be subjected to a reduction test at elevated or simulated production conditions in order to obtain similar reduction and expansion behavior as actual production.