公开(公告)号：US3691038A

公开(公告)日：1972-09-12

申请号：US3691038D

申请日：1970-09-23

申请人： DET NORSKE ZENKKOMPANI AS

发明人： ROEPENACK ADOLF VON ,  WUETRICH HANS ,  SCHMIDT WILHELM

IPC分类号： C01G20060101 ,  C01G49/00 ,  C22B20060101 ,  C22B3/00 ,  C22B19/00 ,  C22D1/22

CPC分类号： C22B19/22 ,  Y02P10/234

摘要： A PROCESS FOR THE RECOVERY OF ZINC FROM MATERIALS, E.G. ORES OR CONCENTRATES AND OTHER SUBSTANCES CONTAINING ZINC AND IRON, GENERALLY IN THE FORM OF OXIDES, WHEREIN THE MATERIAL IS LEACHED WITH EXCESS HOT SULFURIC ACID. THE ACIDITY OF THE EXTRACTS IS REDUCED BY ADDING ZINC OXIDE OR LIKE ZINC-CONTAINING OXIDIC MATERIALS TO PRECIPITATE IRON. THE LEACHING IS CARRIED OUT AT 95*-100*C. WITH A LEACHING SOLUTION CONTAINING 180-220 G./LITER H2SO4. LEACHING IS CONTINUED UNTIL THE SULFURIC ACID CONTENT IS REDUCED TO 20-60 G./LITER H2SO4, WHEREUPON THE ZINC-CONTAINING OXIDIC MATERIALS ARE ADDED, PREFERABLY SUBSEQUENT TO THE ADDITION OF ALKALI-METAL AND/OR AMMONIOM IONS, AT A TEMPERATURE OF 95*-100*C. TO REDUCE THE SULFURIC ACID CONCENTRATION TO LESS THAN 10 G./LITER H2SO4.