| 摘要 |
<p>PURPOSE:To coprecipitate F in Zn extracting liquid together with hydroxides of Al and Fe to remove F, and to manufacture an electrolyte for Zn electrolysis, by extracting Zn by adding iron scraps and Al scraps, etc., then adding a neutralizer and oxidizer thereto in Zn extraction from materials containing Zn by sulfuric acid. CONSTITUTION:Zn ore and Zn scraps are treated by sulfuric acid or tail liquid at pure Zn electrolysis to dissolve and extract Zn. In this case, iron scraps, etc. are fed to set the ionic concn. of two valencies Fe in the extracting liquid to 0.5-2g/l. Further, Al scraps, etc. are added to control the ionic concn. of tervalent Al in the extracting liquid to 100-1,000mg/l. If Zn extraction is finished, a neutralizer such as CaO is added to control the pH to 4-6, and during said control, an oxidizer such as KMnO4 is added to oxidize bivalent Fe ion to tervalent Fe, Fe and Al are ppt.ed and removed as hydroxides. In this time, F in the extracting liquid is also coprecipitated and removed simultaneously. The corrosion of cathode plate by F in electrodeposition of pure Zn at a cathode is eliminated by using Zn extracting liquid contg. no F in electrolysis.</p> |
