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The recycling and recovery of precious metals from secondary materials, such as waste-printed circuit boards, are an important area of circular economy research due to the limited existing resources and increasing amount of e-waste produced by the rapid development of technology. In this study, the kinetic behavior of precious metals Au, Ag, Pt, and Pd between copper matte and iron-silicate slag was investigated at a typical flash smelting temperature of 1300 °C in both air and argon atmospheres. SEM–EDS, EPMA, and LA-ICP-MS-advanced analysis methods were used for sample characterization. The results indicate that precious metals favor the matte phase over slag, and the deportment to matte occurred swiftly within a short time after the system had reached the experimental temperature. With increasing contact times, the precious metals were distributed increasingly into the sulfide matte. The distribution coefficients, based on experimentally measured element concentrations, followed the order of palladium > platinum > gold > silver in both air and argon, and the matte acted as an efficient collector of these precious metals. The obtained results can be applied to industrial copper matte smelting processes, and they also help in upgrading CFD models to simulate the flash smelting process more precisely.
|Number of pages||12|
|Journal||Journal of Sustainable Metallurgy|
|Early online date||9 Jun 2021|
|Publication status||Published - Sep 2021|
|MoE publication type||A1 Journal article-refereed|
- Distribution coefficients
- Flash smelting
- Iron-silicate slag
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- 1 Finished
SYMMET: Symbiosis of metals production and nature
Jokilaakso, A., Klemettinen, A., Aromaa, R., Chen, M., Ruismäki, R., Kleemola, L., Klemettinen, L., Rämä, M. & Revitzer, H.
01/11/2018 → 31/10/2020
Project: Business Finland: Other research funding
Raw Materials Research Infrastructure
Maarit Karppinen (Manager)School of Chemical Engineering