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以ＦｅＳＯ４为原料，采用两步法液相氧化工艺制备了均匀αＦｅ２Ｏ３微粉，研究了反应悬浮液中Ｆｅ（Ⅱ）浓度及初始ｐＨ值对ＦｅＯＯＨ相转化的影响。结果表明，Ｆｅ（Ⅱ）浓度及ｐＨ值对ＦｅＯＯＨ→αＦｅ２Ｏ３相转化时间有很大影响，在ｐＨ值近中性时，少量的Ｆｅ（Ⅱ）离子对相转化具有显著的催化作用，因而缩短了反应周期。通过改变生长与成核两阶段消耗ＦｅＳＯ４的比值，可方便地人为控制αＦｅ２Ｏ３的粒度。
Using FeSO4 as raw material, a uniform αFe2O3 micropowder was prepared by a two-step liquid-phase oxidation process. The effects of Fe (Ⅱ) concentration and initial pH on 相FeOOH phase transformation were investigated. The results showed that the concentration of Fe (Ⅱ) and pH value had a great effect on the phase transformation time of FeOOH → αFe2O3. Fe (Ⅱ) ion had a significant catalytic effect on the phase inversion at pH near neutrality , Thus shortening the reaction cycle. By changing the ratio of the two phases of growth and nucleation to consume FeSO4, the particle size of α-Fe2O3 can be conveniently and artificially controlled.