Effects of Slag Composition and Oxygen Potential on Distribution Ratios of Platinum Group Metals between Al<sub>2</sub>O<sub>3</sub>-CaO-SiO<sub>2</sub>-Cu<sub>2</sub>O Slag System and Molten Copper at 1723 K

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  • Nishijima Waki
    Department of Materials Science and Technology, Faculty of Engineering, Iwate University
  • Yamaguchi Katsunori
    Department of Materials Science and Technology, Faculty of Engineering, Iwate University

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Other Title
  • Al<sub>2</sub>O<sub>3</sub>-CaO-SiO<sub>2</sub>-Cu<sub>2</sub>O 系スラグと溶銅間における白金族金属の分配比に及ぼすスラグ組成および酸素分圧の影響
  • Al₂O₃-CaO-SiO₂-Cu₂O系スラグと溶銅間における白金族金属の分配比に及ぼすスラグ組成および酸素分圧の影響
  • Al ₂ O ₃-CaO-SiO ₂-Cu ₂ Oケイ スラグ ト ヨウ ドウ カン ニ オケル ハッキンゾク キンゾク ノ ブンパイヒ ニ オヨボス スラグ ソセイ オヨビ サンソ ブンアツ ノ エイキョウ
  • Effects of Slag Composition and Oxygen Potential on Distribution Ratios of Platinum Group Metals between Al2O3-CaO-SiO2-Cu2O Slag System and Molten Copper at 1723 K

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Abstract

  The demand of platinum group metals (PGM) such as platinum, rhodium and palladium is recently increasing for a catalyst for decomposition of toxic gases in automobiles. The worldwide scarcity and high price of PGM accelerate the PGM recycling. The liquid copper has been used as a collector metal in one of the major methods for the recovery of PGMs from scraps of the automobile catalyst. With the aim of the minimization of the loss of PGM into slag phase, the distribution ratios of platinum, rhodium and palladium between the molten copper and the Al2O3-CaO-SiO2-Cu2O slag under MgO saturation with Q=0.36 and 0.52 (Q=(mass%CaO+mass%MgO)/(mass%CaO+mass%MgO+mass%SiO2)) were investigated at 1723 K in the range of the oxygen partial pressure 10−8 to 10−3 kPa. The copper solubility in the slag increases with increasing the oxygen potential, and liquid Cu2O separated from the Al2O3-CaO-SiO2-Cu2O slag with the oxygen partial pressure of 10−3 kPa. When the distribution ratio of PGMs between the slag and liquid copper was defined as LPGMs/Cu=(mass%PGM in slag)/[mass%PGM in Cu], LPGMs/Cu for platinum, rhodium and palladium were almost constant with increasing the oxygen potential up to 10−6-10−5 kPa and increased in the range of higher oxygen partial pressure. Based on these distribution ratios, activity coefficients of Pt and Pd oxides in the slag were thermodynamically calculated. The activity coefficients increase with increasing the oxygen potential.<br>

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