Phase equilibria studies for copper smelting/converting slags

Zhao, Baojun (2013). Phase equilibria studies for copper smelting/converting slags. In: Copper 2013: Copper International Conference, Santiago, Chile, (PY54.1-PY54.1). 1-4 December, 2013.

Author Zhao, Baojun
Title of paper Phase equilibria studies for copper smelting/converting slags
Conference name Copper 2013: Copper International Conference
Conference location Santiago, Chile
Conference dates 1-4 December, 2013
Publication Year 2013
Sub-type Published abstract
Open Access Status
Start page PY54.1
End page PY54.1
Total pages 1
Language eng
Formatted Abstract/Summary
Phase equilibria of silicate slags relevant to the copper smelting/converting operations have been systemically investigated in the temperature range 1200 to 1300 °C and oxygen partial pressures between 10-5 and 10-9 atm. The experimental procedures include high temperature equilibration, quenching and accurate measurements of phase compositions using electron probe X-ray microanalysis (EPMA). The effects of CaO, Al2O3, MgO and Po2 on the phase equilibria of the fayalite slags have been systematically investigated.

It was found that spinel and tridymite (SiO2) 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 up to 20 wt% CaO, up to 10 wt% MgO and 10 wt% Al2O3 in the slag increases the spinel liquidus and decreases the tridymite liquidus. Liquidus temperatures in tridymite primary phase field are not sensitive to Po2; Liquidus temperatures in spinel primary phase field increase significantly with increasing Po2. Addition of the same weight of Al2O3 or MgO in slag shows the same effect on the liquidus temperatures in spinel and tridymite primary phase fields. The trends in the effects of Al2O3 or MgO on liquidus temperatura are similar for both copper smelting and converting slags.
Q-Index Code EX
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Conference Paper
Collection: School of Chemical Engineering Publications
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Created: Mon, 17 Mar 2014, 12:33:34 EST by Dr Baojun Zhao on behalf of School of Chemical Engineering