The zinc reduced ash of Annaka Refinery, Gunma Prefecture, is treated at Fujioka Refinery, where pig iron, electrolytic iron and other valuable matters are recovered successfully.
The object of this investigation is to clarify properties of the zinc reduced ash as raw material. The results obtained are summarized as follows:
1) The most frequent size of the reduced ash lies between 5 and 10mm, and the 80 per cent size based on Gaudin-Schumann graph corresponds to 15mm.
2) As a result ofX-ray diffraction concerning the reduced ash, diffraction lines ofα-Fe, FeO, ZnO, C, α-Mn, Pb, ZnO·Fe₂O₃, Zn₂SiO₄, CaO·Al₂O₃·2SiO₂and 4CaO·Al₂O₃·Fe₂O₃were recognized.
3) Chemical analysis, visual inspection, microscopic observation and observation byX-ray microanalyser were performed for the purposes of confirming the result mentioned above and investigating textures of the reduced ash.