Extraction of nickel from nickel alloy by carbonylation

Carbonylation refining technology has been used to extract nickel from nickel alloy. Before carbonylation, roasting and size reduction is used as a pre-treatment method, and re-activation with H 2 is needed. During carbonylation, the addition of H 2 S helps to activate the nickel surface and improve the extraction rate. The supply of H 2 S does not necessarily need to be continuous. The optimum parameters for extraction of nickel are a carbonylation temperature of 70 °C, pressure of 10 bar, flow rate of 0.25–0.35 L/min and mixture of CO and H 2 S as carbonylation agent. The best extraction rate of nickel can reach 99%.