Study on the Action Mechanism of Pre-oxidation on Reduction Behavior of Rock Ilmenite
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摘要: 以攀枝花钛铁矿为试验对象, 详细研究了预氧化对岩矿型钛铁矿还原行为的作用机理。结果表明, 未处理的岩矿型钛铁矿的还原速率较慢, 而预氧化能够有效提高还原速率。这是因为在预氧化矿还原前期会发生Fe3+→Fe2+ (FeTiO3) 的快速转变反应。该反应会生成大量孔洞, 破坏了钛铁矿的致密结构, 有利于后续还原反应的进行。预氧化焙烧温度越高, 焙烧时间越长, 钛铁矿的还原速率越快。此外, 预氧化还会使后续还原产生的金属Fe晶粒变小, 分布变弥散。Abstract: Reduction is the key technological process of preparing titanium-rich material from ilmenite.This paper studied the action mechanism of pre-oxidation on reduction behavior of rock ilmenite in detail,using Panzhihua ilmenite as the experimental subject.The results show that the reduction rate of untreated rock ilmenite is slow and the pre-oxidation can increase the reduction rate effectively. This is due to the rapid transformation reaction of Fe3+→Fe2+ (FeTiO3) at the earlier stage of reduction for pre-oxidized ilmenites.This rapid reaction produces a large number of pores and destroys the dense structure of ilmenite,which is conducive to the proceeding of reduction reaction.The rate of subsequent reduction of ilmenite is greater with higher pre-oxidation temperature and longer roasting time for pre-oxidation.Moreover,the preoxidation also makes the metallic Fe,which is produced by the subsequent reduction,have smaller grains and a more dispersed distribution.
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Key words:
- ilmenite /
- reduction /
- pre-oxidation /
- temperature /
- time
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