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Examples of this include pressure oxidation POX of sulfide ores and concentrates high pressure acid leaching HPAL of nickel laterites and wet air oxidation of organics Both batch and continuous reactors are available at Hazen for developing high temperature processHydrometallurgical processes include high pressure acid leach HPAL and heap leach both of which are generally followed by solvent extraction electrowinning for recovery of nickel Another hydrometallurgical routes is the Caron process which consists of roasting followed by ammonia leaching and precipitation as nickel carbonate Additionally ferronickel is produced by the rotary kiln

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