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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.46  No.10 (2005)  >  pp.2180-2189

MATERIALS TRANSACTIONS
<<Previous article Vol.46  No.10 (2005)   pp.2180 - 2189 Next article>>

Effects of Coexisting Oxygen and Antimony in Molten Copper on Rate of Arsenic Elimination from the Copper Phase by the Use of Na2CO3 Slag

Mitsuru Tanahashi1), Takeru Fujinaga1), Zhijian Su1), Kunihiko Takeda1), Hong Yong Sohn2) and Chikabumi Yamauchi1)
1) Division of Materials Science and Engineering, Department of Materials, Physics and Energy Engineering, Graduate School of Engineering, Nagoya University
2) Department of Metallurgical Engineering, University of Utah


The rate of As elimination from molten copper by the use of Na2CO3 slag was measured at 1523 K. The results obtained, under the experimental conditions of this study, show that As in molten copper is eliminated in a pentavalent 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 probably 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 material balances of As and oxygen in the molten copper and slag phases, and the equilibrium relationship 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 a kinetic viewpoint. The results show that the elimination rate of As is much higher than that of Sb, and two types of elimination behaviors are observed depending on the initial oxygen concentration in molten copper. At relatively low initial oxygen concentrations, As is preferentially eliminated with an initial plateauing of Sb elimination. On the other hand, both elements are eliminated simultaneously at relatively high initial oxygen concentrations. These behaviors were examined from the viewpoint of the oxygen concentration at the slag-metal interface.


Keyword:
sodium carbonate slag, copper refining, arsenic, oxygen, antimony, elimination rate, mass transfer, slag-metal interface

Received: June 16, 2005
Accepted: August 01, 2005 , Published online: November 14, 2005
Copyright (c) 2005 The Japan Institute of Metals

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