| 摘要 |
PROBLEM TO BE SOLVED: To obtain high-purity iron oxide powder for ferrite used for electronic parts for telecommunication equipment, computers, televisions, VTR, etc., especially chip parts and provide a method for producing the iron oxide powder. SOLUTION: This high-purity iron oxide powder for ferrite has <=10 ppm P content and <=0.01 wt.% SO42- content and further has <=0.3 μm particle diameter or the iron oxide powder is obtained by wet method by using a ferric salt as a starting raw material and has <=10 ppm P content and <=0.01 wt.% SO42- content or the iron oxide powder feathers comprising <=0.06 wt.% MnO content and >=99.8 wt.% Fe2O3 content and optionally <=0.006 SiO2 content in addition to the P content and the SO42- content of the above iron oxide powder. |
