Next Article in Journal
Recent Achievements in Rotary, Linear and Friction Stir Welding of Metals Alloys
Previous Article in Journal
Recent Development of Superplasticity in Aluminum Alloys: A Review
Open AccessArticle

Study of the Structure of FeOx-CaO-SiO2-MgO and FeOx-CaO-SiO2-MgO-Cu2O-PdO Slags Relevant to Urban Ores Processing through Cu Smelting

1
Fluid and Process Dynamics (FPD) Group, Swinburne University of Technology, Melbourne 3122, Australia
2
PF Metals Resource Recovery/Envirostream, Melbourne 3101, Australia
*
Author to whom correspondence should be addressed.
Metals 2020, 10(1), 78; https://doi.org/10.3390/met10010078
Received: 23 November 2019 / Revised: 23 December 2019 / Accepted: 28 December 2019 / Published: 2 January 2020
Ferrous-calcium-silicate (commonly known as FCS) slags are used in the valuable metal recycling from urban ores through both primary and secondary copper smelting processes. In the present study, the structure of selected FCS-MgO (FCSM) and FCS-MgO-Cu2O-PdO (FCSM-Cu2O-PdO) slags, relevant to the processes, were investigated using Fourier-transform infrared (FTIR) spectrometry. Deconvolution of the FTIR spectra was carried out to calculate the relative abundance of different silicate structural units (Qn), the overall degree of polymerization (DOP) of the slags and the oxygen speciation in the FCS slags. It was observed that, for the slag investigated, the relative intensity of both the high-frequency band ≈ 1100 cm−1 (Q3) and low-frequency band ≈ 850 cm−1 (Q0) were affected by Fe/SiO2 ratio, basicity, temperature (T) and oxygen partial pressure (pO2). The DOP and the average number of bridging oxygen (BO) were found to decrease with increasing both Fe/SiO2 ratio and basicity. Improved semi-empirical equations were developed to relate the DOP of the slags with chemistry, process parameters and partitioning ratio (i.e., the ratio of the amount of element in the slag phase to metal phase, also known as distribution ratio) of Pd and Ge. Possible reactions, expressed as reactions between metal cations and silicate species, as a way to evaluate thermodynamic properties, are presented herein. View Full-Text
Keywords: ferrous-calcium-silicate (FCS) slag; black copper smelting; slag structure; FTIR spectrometry; E-waste; urban ores; palladium; germanium ferrous-calcium-silicate (FCS) slag; black copper smelting; slag structure; FTIR spectrometry; E-waste; urban ores; palladium; germanium
Show Figures

Figure 1

MDPI and ACS Style

Hasan, M.M.; Rhamdhani, M.A.; Shuva, M.A.H.; Brooks, G.A. Study of the Structure of FeOx-CaO-SiO2-MgO and FeOx-CaO-SiO2-MgO-Cu2O-PdO Slags Relevant to Urban Ores Processing through Cu Smelting. Metals 2020, 10, 78.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop