| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a raw material iron oxide which prevents corrosion of processing equipment and is suitable for producing ferrite which is excellent in magnetic properties, and its production method. <P>SOLUTION: The raw material iron oxide for producing ferrite has a SiO<SB>2</SB>content, by mass, of ≤90 ppm, a P content of ≤10 ppm and a Cl content of ≤700 ppm. In its production method, iron or an iron compound is added to an aqueous iron chloride solution to neutralize free hydrochloric acid in the solution, the pH is adjusted to 1-4, a Ti and/or Zr compound is subsequently added to precipitate Ti and/or Zr as a hydrate, the precipitate is separated and removed using a polymer flocculant, the obtained aqueous iron chloride solution is roasted at an elevated temperature to yield roasted iron oxide, and the rousted iron oxide is rinsed with water. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
