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	Elektrovinning	Ellinghamdiagram	Shrinking Core Model
Ämnesområde	Gruvteknik	Gruvteknik	Gruvteknik
Familj	Process / pipeline	Process / pipeline	Process / pipeline
Ursprungsår	1890	1944	1976
Upphovsperson	Industrial Electrometallurgy Practice	Harold Jeffrey Torreyson Ellingham	Szekely, Evans, and Sohn
Typ	Electrochemical metal extraction and purification	Gibbs free energy diagram for high-temperature reactions	Reaction kinetics model for solid-fluid reactions
Ursprungskälla	Habashi, F. (2011). Electrometallurgy: principles, processes and materials. Metallurgical Transactions, 29(7), 1569-1589.	Ellingham, H. J. T. (1944). Reducibility of oxides and sulfides. Journal of the Society of Chemical Industry, 63(5), 125-160.	Szekely, J., Evans, J. W., & Sohn, H. Y. (1976). Gas-solid reactions. Academic Press, New York.
Alias	Electrodeposition, Electrolytic Extraction	Gibbs Free Energy Diagram, High-Temperature Reduction Diagram	Shrinking Unreacted Core Model, SCM, Leaching Kinetics Model
Närliggande	3	3	3
Sammanfattning	Electrowinning is an electrochemical process that extracts and refines metals from dilute leaching solutions by passing electric current through an electrolytic cell. Metal ions migrate to the cathode (negative electrode) and are reduced to pure metal, while impurities remain in solution. This process is essential for copper, zinc, cobalt, nickel, and gold refining, producing metals of exceptional purity.	The Ellingham Diagram, introduced by Harold Ellingham in 1944, is a graphical representation of the Gibbs free energy change for oxide formation and reduction as a function of temperature. It is an essential tool for predicting the thermodynamic feasibility of ore reduction and selecting appropriate reducing agents and temperatures for smelting and roasting operations.	The Shrinking Core Model, formalized by Szekely, Evans, and Sohn in 1976, describes the kinetics of chemical reactions between solid ore particles and surrounding fluids (leaching solutions, roasting gases). As the reaction proceeds from the particle surface inward, an unreacted core shrinks while products accumulate in a product layer. The model enables prediction of leaching times and optimization of hydrometallurgical processes.