Thermodynamic Analysis in Smelting Processes
Summary
Thermodynamic analysis in smelting processes entails the quantitative evaluation of energy changes and phase stability that govern the conversion of ores into metallic products. At its core lies the minimisation of Gibbs free energy to predict the formation and coexistence of slag, matte and metal phases under high-temperature conditions. Modern approaches combine rigorous experimental measurements with computational thermodynamic modelling to refine databases of solution properties and phase equilibria. Such analyses underpin the optimisation of flux compositions, control of oxygen potential and segregation of impurities or valuable trace elements. They also inform energy efficiency strategies, emissions reduction and process intensification. By integrating thermodynamics with kinetic and fluid-dynamic considerations, researchers create more accurate process simulations, enabling predictive control in flash smelting, converting and secondary recycling operations. The global significance of this work is reflected in improved metal yields, enhanced recovery of critical elements from waste streams and reduced environmental footprint across diverse metallurgical industries.
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Thermodynamic Analysis in Smelting Processes publication trend
The graph below shows the total number of articles in thermodynamic analysis in smelting processes across all publications each year (not limited to Nature Index journals).
Technical terms
Gibbs free energy: thermodynamic potential representing the maximum reversible work obtainable from a system at constant temperature and pressure.
Phase equilibrium: state in which multiple phases coexist without net mass transfer under specified temperature, pressure and composition.
Slag: molten mixture of oxides, silicates and impurities formed as a by-product of smelting.
Matte: sulphide-rich molten phase containing target metals, produced during smelting prior to refining.
Activity coefficient: factor quantifying the deviation of a species’ behaviour from that predicted by an ideal solution model.
References
- Experimental study and thermodynamic modeling of distribution of elements among slag, matte and metal in the Cu–Fe–O–S–Si–(Zn)–(Al, Ca, Mg) system for copper slag cleaning applications. Journal of Materials Research and Technology (2023).
- Phase equilibria in the NiO-ZnO-SiO2 and PbO-NiO-ZnO-SiO2 systems. Journal of the European Ceramic Society (2024).
- Novel fluxing strategy of copper matte smelting and trace metals in E-Waste recycling. Minerals Engineering (2023).
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