An experimental study on the phase equilibria of FeOx-saturated iron silicate slags and metallic copper alloys at 1200–1300 °C

The equilibrium phase relations between metallic copper alloys and magnetite/wüstite-saturated iron silicate slags were investigated at 1200–1300 °C and PO2 of 10−10 to 10−6.5 atm. The experiments involved high-temperature equilibration of samples in a controlled CO–CO2 atmosphere, followed by rapid drop quenching and direct measurement of the phase composition using the electron probe microanalysis technique. The equilibrium compositions for the metal and slag phase at different temperatures were displayed as a function of PO2. The present experimental results were compared with data from the literature as well as the thermodynamic assessment using MTDATA thermodynamic software. The present results contribute to the improvement of copper matte and black copper converting and slag cleaning processes.

Description

Funding Information: This work was financially supported by School of Chemical Engineering, Aalto University, and Business Finland funded SYMMET program (# 3891/31/2018). This study utilized the Academy of Finland's RawMatTERS Finland Infrastructure (RAMI) based at Aalto University, GTK in Espoo, and VTT in Espoo. Min Chen acknowledges the financial support from China Scholarship Council [grant number 201806370217] for funding his study and research in Finland. An anonymous reviewer for the constructive comments on the manuscript is greatly appreciated. The authors report no conflicts of interest. Funding Information: This work was financially supported by School of Chemical Engineering, Aalto University, and Business Finland funded SYMMET program (# 3891/31/2018 ). This study utilized the Academy of Finland's RawMatTERS Finland Infrastructure (RAMI) based at Aalto University, GTK in Espoo, and VTT in Espoo. Min Chen acknowledges the financial support from China Scholarship Council [grant number 201806370217 ] for funding his study and research in Finland. An anonymous reviewer for the constructive comments on the manuscript is greatly appreciated. The authors report no conflicts of interest. Publisher Copyright: © 2022 The Authors

Keywords

Copper smelting, Magnetite, Phase diagram, Resource efficiency, Wüstite

DOI

10.1016/j.calphad.2022.102418

Citation

Chen , M , Avarmaa , K , Taskinen , P , Michallik , R & Jokilaakso , A 2022 , ' An experimental study on the phase equilibria of FeO x -saturated iron silicate slags and metallic copper alloys at 1200–1300 °C ' , Calphad: Computer Coupling of Phase Diagrams and Thermochemistry , vol. 77 , 102418 . https://doi.org/10.1016/j.calphad.2022.102418

Permanent link to this item

https://urn.fi/URN:NBN:fi:aalto-202203282620

Collections

[article-cris] Kemian tekniikan korkeakoulu / CHEM

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