The present removing ferromagnetic from powder of the refractory, raw material of the glass and material of the electric ceramics, generally adopts acid washing in industry.
去除粉状耐火材料、玻璃原料、电瓷物料中的铁磁物质，目前工业上普遍采用酸洗法。
2
The invention also provides the preparation method of the ferromagnetic oxide powder, comprising the steps of dosing, mixing, preburning, crude crushing, fine grinding, drying, annealing and smashing.