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EXTRACTION OF NICKEL FROM A MIXED NICKEL-COBALT HYDROXIDE PRECIPITATE

The extraction of nickel from a mixed nickel-cobalt hydroxide precipitate (MHP) was conceived and experimentally explored. The effect of sulphuric acid concentration, leaching time, leaching temperature and stirring speed on nickel extraction was investigated. After 60 min leaching time, more than 90% of nickel and approximately 80% of cobalt were taken into the leach solution under the following conditions: 0.75M sulphuric acid concentration, 30°C leaching temperature and 400 rpm stirring speed. pH of the leach slurry was determined as 1.23 under the conditions explored. It was observed that there is no beneficial effect of leaching temperature and stirring speed on the extraction of nickel from the MHP sample. The XRD pattern of the fresh MHP sample revealed the data and peak of the sample widening which is indicative of amorphous solid structure.