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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Fe~(3+)→Fe~(2+)(FeTiO_3)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。
Taking Panzhihua ilmenite as test object, the mechanism of pre-oxidation on the reduction behavior of rock-type ilmenite was studied in detail. The results show that the reduction rate of untreated rock type ilmenite is slow, while the pre-oxidation can effectively increase the reduction rate. This is because the rapid transformation reaction of Fe ~ (3+) → Fe ~ (2 +) (FeTiO 3) occurs in the pre-oxidized ore reduction. The reaction will generate a large number of holes, destroy the dense structure of ilmenite, is conducive to the subsequent reduction reaction. The higher the pre-oxidation calcination temperature, the longer the calcination time, the faster the ilmenite reduction rate. In addition, the pre-oxidation will make the subsequent reduction of metal Fe particles become smaller, the distribution becomes diffuse.