Phase Equilibrium between Ni-S Melt and CaO-Al2O3 Based Slag in CO-CO2-SO2 Gas Mixtures at 1773 K

Henao, Hector M., Hino, Mitsuhisa and Itagaki, Kimio (2002) Phase Equilibrium between Ni-S Melt and CaO-Al2O3 Based Slag in CO-CO2-SO2 Gas Mixtures at 1773 K. Materials Transactions, 43 11: 2873-2879. doi:10.2320/matertrans.43.2873


Author Henao, Hector M.
Hino, Mitsuhisa
Itagaki, Kimio
Title Phase Equilibrium between Ni-S Melt and CaO-Al2O3 Based Slag in CO-CO2-SO2 Gas Mixtures at 1773 K
Journal name Materials Transactions   Check publisher's open access policy
ISSN 1347-5320
1345-9678
Publication date 2002-01-01
Sub-type Article (original research)
DOI 10.2320/matertrans.43.2873
Open Access Status Not yet assessed
Volume 43
Issue 11
Start page 2873
End page 2879
Total pages 7
Place of publication Sendai, Japan
Publisher Japan Institute of Metals
Language eng
Subject 091407 Pyrometallurgy
Abstract To provide thermodynamic data for converting the nickel matte to liquid nickel, an experimental study was conducted in the phase equilibrium between the Ni-S alloy and the CaO-Al2O3 based slag melted in a MgO or Al2O3 crucible at 1773 K under controlled PSO2 of 10.1 kPa and PO2 in a range between 5.0× 10-3 and 1.6 Pa by using CO-CO2-SO2 gas mixtures. The contents of nickel in these slags at PO2 of 1.6 Pa, above which solid NiO is expected to precipitate in equilibrium state, were found to be 5.6 and 7.2 mass% for the slags melted in the MgO and Al2O3 crucibles, respectively. The contents of sulfur and oxygen in the nickel melt at PO2 of 1.6 Pa were 2 and 0.4 mass%, respectively. The CaO-Al2O3 based slag with the mass% ratio (CaO/Al2O3) of about 1 melted in the MgO crucible was homogeneous in the investigated PO2 range. While, that with the ratio of about 0.5 melted in the Al2O3 crucible formed two phases composed of a liquid and an Al2O3-NiO solid solution whose nickel content was increased with increasing PO2. The dissolutions of nickel and sulfur in the slag melted in the MgO crucible were discussed on the basis of distribution ratio and sulfide capacity, respectively.
Keyword nickel smelting
nickel refining
phase equilibrium
distribution ratio
activity coefficient
CaO-Al2O3 based slag
nickel matte
nickel converting
magnesia crucible
alumina crucible
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collections: Faculty of Engineering, Architecture and Information Technology Publications
Excellence in Research Australia (ERA) - Collection
 
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