Trace Metal Distributions in Nickel Slag Cleaning

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Volume Title
A3 Kirjan tai muun kokoomateoksen osa
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Date
2018
Major/Subject
Mcode
Degree programme
Language
en
Pages
379-389
Series
Extraction 2018, The Minerals, Metals & Materials Series
Abstract
To capture efficiently the valuable trace metals from nickel slag using electric furnace, it is important to study their distributions between the slag and metallic phases in the furnace. It is impossible to calculate accurately these distributions without experimental measurements. Therefore, in this work, selected trace metal distributions and phase equilibria between K2O containing iron-silicate slags and a metallic Ni-Fe-Cu alloy in nickel slag cleaning furnace conditions were studied. The experimental method developed and applied during the work, involved a modified quenching technique that included equilibration of the samples in semi-sealed quartz ampoules in an inert atmosphere and metallic Fe saturation. The use of the semi-sealed quartz ampoule prevents the escape of volatile elements from the sample during equilibration. Chemical compositions of the phases and the trace elements were analysed by EPMA. From the measured compositions, the trace metal distribution coefficients between the molten Ni-Fe-Cu alloy and slag were calculated.
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Keywords
NI slag cleaning, Distribution of Ag, Au, Sb and Pb, Semi-closed ampoule
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Citation
Hellsten , N , Taskinen , P , Johto , H & Jokilaakso , A 2018 , Trace Metal Distributions in Nickel Slag Cleaning . in B Davis , M Moats & S Wang (eds) , Extraction 2018 : Proceedings of the First Global Conference on Extractive Metallurgy . The Minerals, Metals & Materials Series , Springer , pp. 379-389 , Global Conference on Extractive Metallurgy , Ottawa , Ontario , Canada , 26/08/2018 . https://doi.org/10.1007/978-3-319-95022-8_30