Induration mechanisms of oxidised pellets prepared from mixed magnetite-haematite concentrates
Induration mechanisms of oxidised pellets prepared from mixed magnetite-haematite concentrates
复制标题
由磁铁矿-赤铁矿混合精矿制备的氧化球团的硬化机制
DOI：
10.1179/174328109x410325
复制
发表时间：
2009-07-01
影响因子：
2.1
通讯作者：
Jiang, T.
中科院分区：
文献类型：
--
作者：
Li, G. H.;Li, X. Q.;Jiang, T.
研究了磁铁矿-赤铁矿(M-H)混合精矿球团预热焙烧过程中Fe_2O_3的结晶行为。结果表明，球团矿的强度主要由预热过程中Fe_2O_3颗粒之间的结晶连接提供。这是因为次生赤铁矿(SH)(从磁铁精矿(SH)氧化而来)的Fe2O3活性高于原始赤铁矿(OH)。在焙烧过程中，当温度低于1250℃时，强度主要由SH中Fe2O_3晶体的生长、连接和长大提供。只有当温度超过1280摄氏度时，氢氧化铁颗粒中的Fe2O3再结晶才能很好地发展，球团矿中的铁矿石颗粒完全相连，从而增加了球团矿的强度。
The crystallisation behaviour of Fe2O3 during preheating and roasting of pellets made from mixed magnetite-haematite (M-H) concentrates has been studied. The results indicate that the strength of pellets is mainly provided by the crystalline connections between Fe2O3 particles during preheating. This occurs because the activity of Fe2O3 from secondary haematite (SH) (oxidised from magnetite concentrate, SH) is higher than from original haematite (OH). In the roasting process, when temperature is lower than 1250 degrees C, the strength is mainly provided by the development, connection and growth of Fe2O3 crystalline grains from SH. Only if the temperature exceeds 1280 degrees C does Fe2O3 recrystallisation in OH grains develop well with the iron ore particles in the pellets fully connected, so increasing pellet strength.