Abstract
Ferric oxide which is a principal raw material for ferrite production usually contains small amount of anion as impurities. Because ferric oxide has been generally produced from iron chloride or iron sulfate solutions obtained from pickled liquor, in this paper, we have investigated the effect of chloride ions on the formation of Mg, Zn, Cu and Mn ferrites. Mg ferrite and Zn ferrite are shown that the spinel phase is formed at lower temperature in the case of iron oxide containing a small amount of chloride ions compared with that case of sulfate ions. On the other hand, Cu ferrite and Mn ferrite are shown that the spinel phase is formed at same temperature in the case of iron oxide containing chloride ions. The reason of the low temperature formation of Mg and Zn ferrites may be due to the formation of an active magnesium chloride of some kind of zinc chloric acid in the course of calcination.
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