Distribution of Rhodium between SiO₂-CaO-CrO[x] Slag System and Molten Copper

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  • Takahashi Yuki
    Faculty of Science and Engineering, Waseda University
  • Murata Takashi
    Faculty of Science and Engineering, Waseda University
  • Yamaguchi Katsunori
    Faculty of Science and Engineering, Waseda University Kagami Memorial Research Institute of Materials Science and Technology, Waseda University

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タイトル別名
  • Distribution of Rhodium between SiO<sub>2</sub>–CaO–CrO<i><sub>x</sub></i> Slag System and Molten Copper

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<p>In the hydrometallurgical process used for the recycling of platinum group metals (PGMs), a residue containing Cr2O3 and PGMs is generated. In this study, a pyrometallurgical process was applied, in which PGMs from the residue generated in the hydrometallurgical processes were concentrated in a molten Cu phase as a collector metal, and Cr2O3 was separated into a slag phase with SiO2 and CaO as the flux. To reduce the loss of PGMs into the slag, the dissolution of PGMs into the slag must be reduced. Therefore, the distribution ratio of Rh, as a representative PGM, between the liquid SiO2–CaO–Al2O3–CrOx or the liquid SiO2–CaO–CrOx slag and molten Cu were measured at 1773 K under an oxygen partial pressure of pO<sub>2</sub> = 10-10. The experimental results revealed that the distribution of Rh in the slag increased with increasing CrOx concentration. At a constant Cr2O3 concentration in the slag, the solubility of Rh increased with increasing slag basicity, which is defined as B = (mass%CaO)/(mass%SiO2). Furthermore, compared with the distributions of Rh and Pt between the slag system and molten Cu, Rh was more easily lost to the slag, and the dependence of Rh on basicity was greater than that of Pt.</p>

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  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 65 (5), 524-529, 2024-05-01

    公益社団法人 日本金属学会

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