Experimental study and thermodynamic modeling of the Cu–Sn–Si–O system and sub-systems. (September 2021)

• Record Type: Journal Article
• Authors: Starykh, Roman; Shevchenko, Maksym; Shishin, Denis; Jak, Evgueni
• Is Part Of: Calphad. Volume 74(2021)
• Publication Date: 2021-09
• Subjects: Black copper -- Cassiterite -- Tin distribution -- FactSage; Phase diagrams -- Data processing -- Periodicals; Thermochemistry -- Data processing -- Periodicals; Diagrammes de phases -- Informatique -- Périodiques; Thermochimie -- Informatique -- Périodiques; Thermodynamica; Electronic journals; 541.363
• DOI: 10.1016/j.calphad.2021.102312
• Languages: English
• ISSNs: 0364-5916

Abstract

Abstract: Phase equilibria between slag, Cu–Sn alloy and solid oxide phases, SnO2 (cassiterite) or SiO2 (tridymite, cristobalite) are important for oxidizing fire refining of black copper produced during the recycling of copper scrap and waste electrical and electronic equipment. Integrated experimental and thermodynamic modeling study is presented for the Cu–Sn–Si–O chemical system and its sub-systems. Experimental technique involved high-temperature equilibration, followed by rapid quenching and direct measurement of Cu, Sn and Si concentrations in the liquid and solid phases using the electron probe X-ray microanalysis. Experimental results and literature data have been used to develop the thermodynamic database for the system. The database works within the environment of FactSage software, as well as ChemApp, ChemSheet and SimuSage. Combined with other assessments, it can be used to optimize and develop recycling processes using the black copper route. Highlights: Slags with high wt. % Cu and Sn form during the oxidizing refining of black copper. Phase equilibria in the Cu–Sn–Si–O system is studied for the first time experimentally. FactSage thermodynamic model for the Cu–Sn–Si–O system is developed.