在ｐＨ值５－６条件下，用空气氧化ＦｅＣｌ_２溶液合成的氧化铁矿物类型主要取决于氧化速度，快速氧化有利于纤铁矿的形成；慢速氧化有利于磁铁矿和磁赤铁矿的形成，同时，在一种红壤的铁子和假砂中发现含有结晶度差的磁赤铁矿，从而证实了红壤中磁性矿物次生的可能性。 Under the condition of pH value 5-6, the type of iron oxide minerals synthesized by air oxidation of FeCl 2 solution mainly depends on the oxidation rate, and the rapid oxidation is beneficial to the formation of lepidocrocite. Slow oxidation favors magnetite and maghemite At the same time, the magnetic hematite with poor crystallinity was found in the ferric and pseudotyped sand of a red soils, confirming the possibility of secondary magnetic minerals in red soils.