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研究了ＦｅＳＯ４浓度及ｐＨ值（４～８）对γＦｅＯＯＨ在（９９±１）℃下相转化为αＦｅ２Ｏ３的影响．结果表明，Ｆｅ（Ⅱ）／Ｆｅ（Ⅲ）为３％～５％及ｐＨ值为近中性时相转化时间最短．指出Ｆｅ（Ⅱ）离子对γＦｅＯＯＨ的促进作用为ＦｅＯＨ＋吸附在γＦｅＯＯＨ表面使其溶解造成的．
The effect of FeSO4 concentration and pH value (4 ~ 8) on the phase transformation of γFeOOH into αFe2O3 phase at (99 ± 1) ℃ was studied. The results showed that the phase transformation time was the shortest when Fe (Ⅱ) / Fe (Ⅲ) was 3% ~ 5% and pH was near neutral. It is pointed out that the promotion effect of Fe (II) ion on γ-FeOOH is caused by the dissolution of FeOH + on the surface of γ-FeOOH.