Effects of CaO, Al2O3 and MgO on liquidus temperatures of copper smelting and converting slags under controlled oxygen partial pressures

Zhao, Baojun, Hayes, Peter and Jak, Evgueni (2012). Effects of CaO, Al2O3 and MgO on liquidus temperatures of copper smelting and converting slags under controlled oxygen partial pressures. In: Proceedings of the Ninth International Conference on Molten Slags, Fluxes and Salts (MOLTEN12). Ninth International Conference on Molten Slags, Fluxes and Salts (MOLTEN12), Beijing, China, (153-159). 27-30 May 2012. doi:10.2298/JMMB120812009Z

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Author Zhao, Baojun
Hayes, Peter
Jak, Evgueni
Title of paper Effects of CaO, Al2O3 and MgO on liquidus temperatures of copper smelting and converting slags under controlled oxygen partial pressures
Formatted title
Effects of CaO, Al2O3 and MgO on liquidus temperatures of copper smelting and converting slags under controlled oxygen partial pressures
Conference name Ninth International Conference on Molten Slags, Fluxes and Salts (MOLTEN12)
Conference location Beijing, China
Conference dates 27-30 May 2012
Proceedings title Proceedings of the Ninth International Conference on Molten Slags, Fluxes and Salts (MOLTEN12)   Check publisher's open access policy
Journal name Journal of Mining and Metallurgy Section B-Metallurgy   Check publisher's open access policy
Place of Publication Beijing, China
Publisher The Chinese Society for Metals
Publication Year 2012
Sub-type Fully published paper
DOI 10.2298/JMMB120812009Z
Open Access Status DOI
ISSN 1450-5339
Volume 49
Issue 2
Start page 153
End page 159
Total pages 13
Collection year 2013
Language eng
Formatted Abstract/Summary
Phase equilibria of silicate slag systems relevant to the copper smelting/converting operations have been experimentally studied over a wide range of slag compositions, temperatures and atmospheric conditions. The systems selected are of industrial interest and fill the gaps in fundamental information required to systematically characterise and describe copper slag chemistries. The experimental procedures developed at the Pyrometallurgy Research Centre (PYROSEARCH) that have been used, include equilibration of synthetic slag at high temperatures, rapid quenching of resulting phases, and accurate measurement of phase compositions using electron probe X-ray microanalysis (EPMA). The effects of CaO, Al2O3 and MgO on the phase equilibria of this slag system have been experimentally investigated in the temperature range 1200 to 1300 oC and oxygen partial pressures between 10-5 and 10-9 atm.

It was found that spinel and silica are major primary phases in the composition range related to copper smelting/converting slags. In addition, olivine, diopside and pyroxene may also appear at certain conditions. The presence of CaO, MgO and Al2O3 in the slag increases the spinel liquidus and decreases the silica liquidus. Liquidus temperatures in silica primary phase field are not sensitive to Po2; Liquidus temperatures in spinel primary phase field increase with increasing Po2. At 1300 oC and low Po2, the spinel (Fe2+,Mg2+)O.(Al3+,Fe3+) primary phase field can be replaced by wustite (Fe2+,Mg2+)O.


Keyword Copper smelting
Copper converting
Liquidus temperature
Slag
Q-Index Code E1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Paper W122.

Document type: Conference Paper
Collections: School of Chemical Engineering Publications
Official 2013 Collection
 
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Created: Fri, 15 Feb 2013, 19:40:50 EST by Dr Baojun Zhao on behalf of School of Chemical Engineering