用天然磁铁矿作原料，不进行磁选，直接用固相反应法生产永磁铁氧体。
The permanent magnetic ferrite was prepared by the method of solid phase reaction with the natural magnetite without magnetic separation.
用天然磁铁矿作原料，不进行磁选，直接用固相反应法生产永磁铁氧体。
The permanent magnetic ferrite was prepared by the method of solid phase reaction with the natural magnetite without magnetic separation.
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