Phase Equilibrium between FeOx-SiO2 base Slag and Cu2S-Ni3S2-FeS Mattes with Different Cu and Ni Contents at 1,573K.

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  • FONT Jonkion M.
    Institute for Advanced Materials Processing, Tohoku University, Aoba–ku, Sendai 980–8577
  • HINO Mitsuhisa
    Institute for Advanced Materials Processing, Tohoku University, Aoba–ku, Sendai 980–8577
  • ITAGAKI Kimio
    Institute for Advanced Materials Processing, Tohoku University, Aoba–ku, Sendai 980–8577

Bibliographic Information

Other Title
  • ＦｅＯｘ‐ＳｉＯ２基スラグと各種のＣｕ２Ｓ‐Ｎｉ３Ｓ２‐ＦｅＳ系マット間の１，５７３Ｋにおける相平衡について
  • FeOx-SiO2基スラグと各種のCu2S-Ni3S2-FeS系マット間の1,573Kにおける相平衡について
  • FeOx SiO2キ スラグ ト カクシュ ノ Cu2S Ni3S2 FeSケイ マット カン ノ 1 573K ニ オケル ソウ ヘイコウ ニ ツイテ

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Abstract

As a fundamental study for systematic and comprehensive understanding of copper and nickel smelting processes from a standpoint of thermodynamics, the phase equilibrium between the FeOX-SiO2 base slag, which was saturated with silica and containing about 6 mass % MgO, and the Cu2S-Ni3S2-FeS matte with NNi /(NNi + NCu) molar ratios of 0, 0.25, 0.5, 0.75 and 1 was investigated at 1,573 K under the partial pressure of SO2 with 0.1 atm. The slag and the matte were equilibrated in a MgO crucible and the partial pressures of oxygen and sulfur were controlled by using an Ar-SO2-S2 gas mixture passing through a sulfur reservoir. It was clarified that the partial pressures of oxygen and sulfur in relation to the iron content in the matte were almost independent of the matte species. This was considered to be ascribed to the activity of FeS in the matte which was almost constant against the matte species when the composition of iron in the matte was specified. The content of copper in the slag at a specified composition of iron in the matte decreased with increasing the nickel molar ratio, NNi /(NNi + NCu), in the matte while that of nickel increased with increasing the nickel molar ratio. It was found that the distribution ratio of silver between the slag and matte phases was considerably small at less than 0.1 and had a tendency to increase with increasing the nickel molar ratio in the matte when the composition of iron in the matte was specified. On the other hand, the distribution ratio of cobalt presented considerably large values of about 1 in the range of low iron content in the matte.

Journal

  • Shigen-to-Sozai

    Shigen-to-Sozai 115 (6), 460-465, 1999

    The Mining and Materials Processing Institute of Japan

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