Acid leaching of lateritic ore
Abstract
Abstract NICKEL VALUES ARE ACID LEACHED FROM NICKELIFEROUS OXIDE ORRES BY FORMING AN AQUEOUS SLURRY OF ORE AND PYRITES IN AN AUTOCLAVE AND OXIDIZING THE PYRITES AT A TEMPERATURE BETWEEN ABOUT 200*C. AND 260*C. TO PROVIDE A SULFURIC ACID SOLUTION FOR SELECTIVELY LEACHING THE NICKEL VALUES CONTAINED IN THE NICKELIFEROUS OXIDE ORE WITHOUT ENCOUNTERING UNDUE SCALE FORMATION ON THE AUTOCLAVE WALLS AND IN AUXILIIARY EQUIPMENT. ADVANTAGEOUSLY, THE SLURRY IS HEATED TO A TEMPERATURE ABOVE ABOUT 250*C. AFTER THE LEACHING REACTION IS COMPLETE TO FACILITATE SUBSEQUENT LIQUID-SOLID SEPARATION. DISSOLVED NICKEL AND COBALT VALUES CAN BE RECOVERED BY CONVENTIONAL TECHNIQUES, SUCH AS HYDROGEN SULFIDE PRECIPITATION.
Inventors
- 👤 V Opratko
- 👤 J Bell
- 👤 R Ferrajuolo
Bibliographic Details
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