Compară metode

	Modelul cu nucleu contractil	Electrocâștigul	Diagrama Ellingham
Domeniu	Inginerie minieră	Inginerie minieră	Inginerie minieră
Familie	Process / pipeline	Process / pipeline	Process / pipeline
Anul apariției	1976	1890	1944
Autorul original	Szekely, Evans, and Sohn	Industrial Electrometallurgy Practice	Harold Jeffrey Torreyson Ellingham
Tip	Reaction kinetics model for solid-fluid reactions	Electrochemical metal extraction and purification	Gibbs free energy diagram for high-temperature reactions
Sursa seminală	Szekely, J., Evans, J. W., & Sohn, H. Y. (1976). Gas-solid reactions. Academic Press, New York.	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.
Denumiri alternative	Shrinking Unreacted Core Model, SCM, Leaching Kinetics Model	Electrodeposition, Electrolytic Extraction	Gibbs Free Energy Diagram, High-Temperature Reduction Diagram
Înrudite	3	3	3
Rezumat	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.	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.