Method of recovering metals from sulfide-containing mixtures
Abstract
Abstract METALS SUCH AS COPPER AND NICKEL ARE SEPARATED FROM SULFIDE-CONTAINING MIXTURES OR COMPOSITIONS THEREOF, E.G. COPPER-NICKEL MATTE, WHICH CONTAIN AT LEAST ONE METAL WHOSE SULFIDE IS UNSTABLE IN SULFURIC ACID. THE MIXTURE IS SLURRIED IN SULFURIC ACID WITH A H2SO4 CONCENTRATION OF AT LEAST 400 GRAMS PER LITER. THE SLURRY IS EVAPORATED TO AN H2SO4 CONCENTRATION OF 1000 G./L. AND IS THEN HEATED TO A TEMPERATURE ABOVE 120*C. BUT BELOW 140*C. (PREFERABLY ABOUT 130*C.) UNTIL THE METAL HAVING UNSTABLE SULFIDES IS CONVERTED TO ITS SULFATE. THE SOLID AND LIQUID PHASES ARE THEN SEPARATED TO RECOVER A METAL SULFATE BY LEACHING FROM THE SOLID PHASE AND ENABLING RECOVERY OF THE METALS FROM THE SEPARATE PHASES.
Inventors
- 👤 Klaus Emicke
- 👤 Wilhelm Goralczyk
Bibliographic Details
Claims Analysis
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