| 摘要 |
<p>1322745 Purifying jarosite DET NORSKE ZINKKOMPANI AS 2 Oct 1970 [2 Oct 1969] 46854/70 Heading C1A Jarosite residue containing zinc ferrites and/or colloidal iron hydroxide and/or other colloidal material is leached with aq. H 2 SO 4 to dissolve the zinc ferrites and/or flocculate the colloidal material. The H 2 SO 4 may be added to provide a final concn. of 10-60 g/l. liquid. The temp. of the leaching process may be 50-95‹ C. The H 2 SO 4 may be added to the supernatant liquor or to the residue in slurry form. The solid content of the slurry may be 350-450 g/l. The residue may have been obtained by partially neutralizing to a pH of 1À5 with roasted zinc ore in the presence of Na, K, and/or NH 4 ions, a Fe/Zn soln. prepared by H 2 SO 4 acid treatment at 95‹ C. of a leach residue from neutral acid leaching a roasted zinc ore in dil. H 2 SO 4 .</p> |
