Thermodynamics and Kinetics of the Carbonyl process for the Refining of Nickel

Sastry, D H and Dwarakadasa, E S and Iyengar, G N K and Subramanian, S (1997) Thermodynamics and Kinetics of the Carbonyl process for the Refining of Nickel. In: Recent advances in metallurgical processes - Vol 1, 16th-19th July 1997, IIS, Bangalore.



The discovery by Langer and Mond in 1889 of the reaction of carbon monoxide at atmospheric pressure with active nickel at 315-353K to form gaseous Ni(C0)4 and its ready reversibility at higher temperatures paved the way for the development of the carbonyl refining process for nickel. Subsequently, to improve the kinetics, a high pressure process was developed for the carbonyl refining of Ni at somewhat higher temperatures. The carbonyl process makes it possible to produce nickel of very high purity and extr-emely fine size. This paper describes the thermodynamics and kinetics of the formation of nickel carbonyl from pure nickel and its alloys, its vapour phase transport and its decomposition.. The thermodynamic analysis includes const-ruction of Ellingham diagrams, pressure-temperature rela-tionships, partial pressuretemperature relationships and productivity function-temperature-pressure relationships for the various carbonyls. The kinetics of Ni(CO)4 forma-tion and decomposition has been analyzed based on the information available in the literature.

Item Type:Conference or Workshop Item (Paper)
Official URL/DOI:
Uncontrolled Keywords:Thermodynamics; Kinetics; Refining of Nickel; horizontal glass reactor
Divisions:Metal Extraction and Forming
ID Code:6561
Deposited By:Sahu A K
Deposited On:23 Apr 2013 11:58
Last Modified:23 Apr 2013 11:58
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