Purification of Iron Oxide Obtained from Iron Precipitation of the Zinc Leaching Residues and Measurement of Magnetization Characteristics

摘要

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 effects of S, As, Zn on the magnetization characteristics, that is, saturation magnetization (#sigma#), coercive force (#CHI#) and magnetization sensbility (#CHI#) were tested.The main results obtained are as follow:1) S, As, Zn are removed from 4.45 percent to 2 approx 30 ppm, from 0.51 percent to 30 approx 44 ppm, from 0.60 percent to about 247 approx 257 ppm by purified treatment, respectively.2) The yield of purified iron oxide crystal is about 73 percent.3) 5 appears to increase #sigma# and #CHI#, and to lower iH_C. As appears to lower #sigma# and #CHI#, and to increase iH_C Zn appears to increase a, and to lower iH_C and #CHI#.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.