Purification of iron oxide obtained from iron precipitation of the Zinc leaching residues with Na
2B
4O
7 flux by use of the recrystallization method and measurement of magnetization characteristics of purified iron oxide have been investigated.
Effects of iron oxide/flux ratio on removal of S, As, Zn and yield of the purified iron oxide crystal, and effectsof S, As, Zn on the magnetization characteristics, that is, saturation magnetization (σ), coercive force (
iHc) and magnetization sensbility (
X) were tested.
The main results obtained are as follow:
1) S, As, Zn are removed from 4.45% to 2-30 ppm, from 0.51% to 30-44 ppm, from 0.60 % to about 247-257 ppm by purified treatment, respectively.
2) The yieldof purified iron oxide crystal is about 73 %.
3) S appears to increase σ and
x, and to lower iHc. As appears to lower σ and
x, and to increase
iHc. Zn appears to increase σ, and to lower
iHc and
x.
4) It was recognized that As is large as compared with S and Zn in the effect on magnetization characteristics of iron oxide crystal, and governs magnetization characteristics of iron oxide.
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