氧化球团矿中Fe2O3的结晶规律

来源期刊:中南大学学报(自然科学版)2007年第1期

论文作者:陈耀明 李建

文章页码:70 - 73

关键词:氧化球团;结晶规律;晶形;显微结构

Key words:oxidized pellet; crystal rules; crystal types; microstructure

摘    要:以磁铁矿精矿(Fe3O4)为原料,添加粘结剂后进行混合、造球,将生球干燥预热后,在1 150~1 280 ℃氧化焙烧6~15 min。将所得氧化球团取样制片,采用显微镜和扫描电镜(SEM)对Fe2O3再结晶晶形进行研究。研究结果表明:Fe2O3再结晶主要形成3种晶形,即初晶、发育晶和互连晶;球团矿质量与Fe2O3的晶形有密切关系,3种不同晶形的球团抗压强度有明显差异;随着焙烧温度的升高,初晶→发育晶→互连晶形依次形成,球团抗压强度逐渐提高,当氧化球团矿内部Fe2O3大量形成互连晶时,氧化球团矿抗压强度最高,质量最好。解释了球团抗压强度随温度升高而升高的微观机理;同时验证了氧化球团矿主要靠Fe2O3再结晶的固相固结机理。

Abstract: Magnetite concentrate mixed with bentonite was balled, and then green ball was dried and preheated, pellets were fired for 6-15 min at 1 150-1 280 ℃ in oxidizing atmosphere. The re-crystallization of Fe2O3 in oxidized pellet was studied by microscope and scanning electron microscope. The results show that three major kinds of crystals are formed in oxidized pellets and different crystal types lead to different pellet compressive strengthes. With the increase of firing temperature, crystallization of Fe2O3 follows the sequence of primary crystal→developing crystal→interconnected crystal with the improvement of pellet compressive strength accordingly. When there are a large number of interconnected crystals of Fe2O3 in oxidized pellets, the pellet compressive strength and quality are the strongest and the best. The crystallization rules of Fe2O3 can explain the micro-mechanism of the enhancement of pellet compressive strength with the increase of firing temperature and can prove that the agglomeration of oxidized pellets mainly depends on the re-crystallization of Fe2O3.

基金信息:中南大学创新工程资助项目

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