Thermodynamic properties of molten sulfides: Part I. The system Ni−S

Meyer, Gustavo A.; Warner, J. S.; Rao, Y. K.; Kellogg, Herbert H.

doi:10.1007/bf02913564

Cited by 40 publications

(26 citation statements)

References 3 publications

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“…1. It is found that the present results agree fairly well with the data by Meyer et al 9) within scatter of the data.…”

Section: Alloy Phasesupporting

confidence: 92%

“…The right limit corresponds to the formation of Ni 3 S 2 in the alloy phase, while the left limit to log p O 2 of −4.8 where the precipitation of solid NiO is anticipated. Meyer et al 9) determined p S 2 in relation to the sulfur content in the Ni-S melt by equilibrating with H 2 -H 2 S gas mixtures at 1773 K, which is shown with a dashed line in the Fig. 1.…”

Section: Alloy Phasementioning

confidence: 99%

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

2002

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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-Al 2 O 3 based slag melted in a MgO or Al 2 O 3 crucible at 1773 K under controlled P SO 2 of 10.1 kPa and P O 2 in a range between 5.0 × 10 −3 and 1.6 Pa by using CO-CO 2 -SO 2 gas mixtures. The contents of nickel in these slags at P O 2 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 Al 2 O 3 crucibles, respectively. The contents of sulfur and oxygen in the nickel melt at P O 2 of 1.6 Pa were 2 and 0.4 mass%, respectively. The CaO-Al 2 O 3 based slag with the mass% ratio (CaO/Al 2 O 3 ) of about 1 melted in the MgO crucible was homogeneous in the investigated P O 2 range. While, that with the ratio of about 0.5 melted in the Al 2 O 3 crucible formed two phases composed of a liquid and an Al 2 O 3 -NiO solid solution whose nickel content was increased with increasing P O 2 . 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.

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“…1. It is found that the present results agree fairly well with the data by Meyer et al 9) within scatter of the data.…”

Section: Alloy Phasesupporting

confidence: 92%

Section: Alloy Phasementioning

confidence: 99%

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

2002

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“…2. It is found that the present results agree fairly well with the data by Meyer et al 9) within scatter of the data even though the present system contains iron.…”

Section: Alloy Phase 311 Sulfur Contentsupporting

confidence: 92%

“…The limits of p O 2 and p S 2 , between which the experiments were carried out, are indicated with the dash-dot lines. Meyer et al 9) determined p S 2 in relation to the sulfur content in the Ni-S melt by equilibrating with H 2 -H 2 S gas mixtures, which is shown with a broken line in Fig. 2.…”

Section: Alloy Phase 311 Sulfur Contentmentioning

confidence: 99%

Phase Equilibrium between Ni-S Melt and FeOX-SiO2 or FeOX-CaO Based Slag under Controlled Partial Pressures

2002

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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 FeO X -SiO 2 or FeO X -CaO based slag in a magnesia crucible at 1773 K under controlled p SO 2 of 10.1 kPa and p O 2 in a range between 5.1 × 10 −3 and 1.6 Pa by using CO-CO 2 -SO 2 gas mixtures. The solubility of nickel in these slags at p O 2 of 1.6 Pa, above which precipitation of a FeO X -NiO solid solution was anticipated, was found to be 10.1 and 20.3 mass% for the FeO X -SiO 2 and FeO X -CaO based slags, respectively. The contents of iron, sulfur and oxygen in the nickel melt equilibrated with these slags were 2, 3 and 0.5 mass% for the FeO X -SiO 2 based slag and 1, 3 and 0.5 mass% for the FeO X -CaO based slag, respectively. The dissolutions of nickel and sulfur in the slags were discussed on the basis of distribution ratio and sulfide capacity, respectively.

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“…The standard state for nickel is supercooled liquid nickel. Then, the a'o(=p1/2o2) is obtained by (9) The nickel activity, aNi, has been reported as 0.58(9) at xs=0.30. Taking aNio as unity, the a'o supercooled liquid cobalt was obtained as 0.38 at xs=0.40 from the Gibbs-Duhem equation by using the reported sulfur pressure over the cobalt sulfide melt(10)(11).…”

Section: Methodsmentioning

confidence: 99%

Oxidation of Molten Nickel and Cobalt Sulfides

et al. 1988

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An amount of 100mg of nickel or cobalt sulfide was put in a slender alumina tube of 3mm ID and 25mm length and oxidized at 1473 K in a mixed O2-Ar gas stream. Sulfur atomic fraction, xs, was 0.30 to 0.40 for nickel sulfide and 0.400 to 0.446 for cobalt sulfide. When the xs was lower, the NiO or CoO layer was formed on the melt surface without the evolution of SO2 gas and the growth rate of the oxide layer was controlled initially by gas diffusion and subsequently by cation diffusion through the oxide layer. When the xs was higher, the desulfurization took place which resulted in lowering of sulfur potential of the melt. When the pso2 in equilibrium with the melt and the oxide becomes lower than the atmospheric pressure, the formation of oxide starts to occur. The xs-value at the transition from desulfurization to the oxide formation was 0.30 to 0.33 for nickel sulfide and 0.41 to 0.43 for cobalt sulfide.

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Thermodynamic properties of molten sulfides: Part I. The system Ni−S

Cited by 40 publications

References 3 publications

Phase Equilibrium between Ni-S Melt and CaO-Al<SUB>2</SUB>O<SUB>3</SUB> Based Slag in CO-CO<SUB>2</SUB>-SO<SUB>2</SUB> Gas Mixtures at 1773 K

Phase Equilibrium between Ni-S Melt and CaO-Al<SUB>2</SUB>O<SUB>3</SUB> Based Slag in CO-CO<SUB>2</SUB>-SO<SUB>2</SUB> Gas Mixtures at 1773 K

Phase Equilibrium between Ni-S Melt and FeO<SUB>X</SUB>-SiO<SUB>2</SUB> or FeO<SUB>X</SUB>-CaO Based Slag under Controlled Partial Pressures

Oxidation of Molten Nickel and Cobalt Sulfides

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