Nickel, copper and cobalt coalescence in copper cliff converter slag
The aim of this investigation is to assess the effect of various additives on coalescence of nickel, copper and cobalt from slags generated during nickel extraction. The analyzed fluxes were silica and lime while examined reductants were pig iron, ferrosilicon and copper-silicon compound. S...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
University of Belgrade, Technical Faculty, Bor
2016-01-01
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| Series: | Journal of Mining and Metallurgy. Section B: Metallurgy |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/1450-5339/2016/1450-53391600024W.pdf |
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| Summary: | The aim of this investigation is to assess the effect of various additives on
coalescence of nickel, copper and cobalt from slags generated during nickel
extraction. The analyzed fluxes were silica and lime while examined
reductants were pig iron, ferrosilicon and copper-silicon compound. Slag was
settled at the different holding temperatures for various times in conditions
that simulated the industrial environment. The newly formed matte and slag
were characterized by their chemical composition and morphology. Silica flux
generated higher partition coefficients for nickel and copper than the
addition of lime. Additives used as reducing agents had higher valuable metal
recovery rates and corresponding partition coefficients than fluxes.
Microstructural studies showed that slag formed after adding reductants
consisted of primarily fayalite, with some minute traces of magnetite as the
secondary phase. Addition of 5 wt% of pig iron, ferrosilicon and
copper-silicon alloys favored the formation of a metallized matte which
increased Cu, Ni and Co recoveries. Addition of copper-silicon alloys with
low silicon content was efficient in copper recovery but coalescence of the
other metals was low. Slag treated with the ferrosilicon facilitated the
highest cobalt recovery while copper-silicon alloys with silicon content
above 10 wt% resulted in high coalescence of nickel and copper, 87 % and 72 %
respectively. |
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| ISSN: | 1450-5339 2217-7175 |