| 摘要 |
<p>PURPOSE:To make pyrite cinder contg. Cu, Zn, Pb, As, etc. reusable as an iron source by treating said pyrite cinder with an aq. mineral acid soln. contg. iron salt and dissolving and extracting the above-mentioned impurities and to reutilize the residual liquid for treating the pyrite cinder by precipitating the impurities in the extracting liquid. CONSTITUTION:The pyrite cinder after SO2 of raw material for sulfuric acid is drawn by combustion of sulfide iron ore contains Cu, Zn, Pb, As, etc. as impurities and are not usable as a raw material for iron making. The impurities such as Cu, etc. are consequently dissolved and extracted by adding an aq. soln. of HCl and H2SO4 contg. iron salt such as FeCl2, FeSO4, etc. at 20-100g/l in terms of Fe and having <=1pH to said pyrite cinder at 5-10m<3> for each one ton of the pyrite cinder and treating the same for <=60min. The treated pyrite cinder is subjected to a solid-liquid sepn. and the cinder from which Cu, etc. are removed is used as the raw material for iron making. The liquid is treated by H2S, etc. to settle Cu, As as sulfide. The remaining liquid is reutilized for treating the pyrite cinder. Part thereof is fed to a stage for removing Zn, Pb, etc. failing to settle and is thus regenerated.</p> |
