The Rate of Arsenic and Antimony Elimination from Molten Copper by the Use of Na2CO3 Slag

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  • Tanahashi Mitsuru
    Division of Materials Science and Engineering, Department of Materials, Physics and Energy Engineering, Graduate School of Engineering, Nagoya University
  • Fujinaga Takeru
    Division of Materials Science and Engineering, Department of Materials, Physics and Energy Engineering, Graduate School of Engineering, Nagoya University
  • Su Zhijian
    Division of Materials Science and Engineering, Department of Materials, Physics and Energy Engineering, Graduate School of Engineering, Nagoya University
  • Takeda Kunihiko
    Division of Materials Science and Engineering, Department of Materials, Physics and Energy Engineering, Graduate School of Engineering, Nagoya University
  • Sohn Hong Yong
    Department of Metallurgical Engineering, University of Utah
  • Yamauchi Chikabumi
    Division of Materials Science and Engineering, Department of Materials, Physics and Energy Engineering, Graduate School of Engineering, Nagoya University

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Other Title
  • Ｎａ２ＣＯ３スラグによる溶銅からのひ素およびアンチモンの除去速度
  • Na2CO3スラグによる溶銅からの砒素およびアンチモンの除去速度
  • Na2CO3 スラグ ニ ヨル ヨウ ドウ カラ ノ ヒソ オヨビ アンチモン ノ ジョキョ ソクド

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Abstract

The rate of As elimination from molten copper by the use of Na2CO3 slag was measured at 1523 K. The results obtained under the present experimental conditions show that As in molten copper is eliminated in a penta-valent form and that its elimination rate increases with increasing initial oxygen concentration in molten copper. Based on the results obtained in the present study, the overall rate of As elimination is considered to be controlled by mass transfer in molten copper. The mass-transfer coefficient of As in molten copper at 1523 K was determined to be 1.3 (±0.4)×10-4 m · s-1 based on the mass balances of As and oxygen in the molten copper and slag phases and the equilibrium relation of the As elimination reaction at the slag-metal interface. In addition, the behavior of the simultaneous elimination of As and Sb which coexist as impurities in molten copper at 1523 K were also investigated from the kinetic viewpoints. The results obtained show that the elimination rate of As is much faster than that of Sb, and two types of elimination behaviors are observed, depending on the initial oxygen concentration in molten copper, i.e. at relatively low initial oxygen concentration, As being preferentially eliminated with stagnation of the Sb elimination, while both elements being simultaneously eliminated at relatively high initial oxygen concentration. These behaviors were examined from the viewpoint of the oxygen concentration at the slag-metal interface during the process.

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