Activities in NaO0.5-CO2-AsO2.5 slag and estimation of distribution ratio of arsenic between the slag and molten copper

Hiroyuki Fukuyama, Masatsugu Tonsho, Toshiharu Fujisawa, Chikabumi Yamauchi

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9 Citations (Scopus)

Abstract

A principle has been established to estimate the equilibrium distribution ratio of an impurity element X between NaO0.5-CO2-XOv/2 slag (v: the valence of X) and molten copper defined by { (mass% of X in slag) / [mass% of X in metal] }, over a wide range of the slag composition as a function of partial pressures of CO2 and oxygen. Based on the principle, the following measurements on NaO0.5-CO2-AsO2.5 slag were conducted to estimate the distribution ratio of arsenic. (1) Activities of NaO0.5 in the slag were determined by the EMF method using β″-alumina as a solid electrolyte over a wide range of the slag composition for various partial pressures of CO2. (2) Activities of AsO2.5 could be calculated from the activities of NaO0.5 by integrating the Gibbs-Duhem relation. Activities of AsO2.5 as the initial values of the integration were determined by the distribution equilibrium measurements of arsenic between the slag and molten copper. From the obtained results, together with the solubility data of CO2 in the slag reported previously, the equilibrium distribution ratio of arsenic was successfully calculated as a function of partial pressures of CO2 and oxygen, slag composition and temperature.

Original languageEnglish
Pages (from-to)72-86
Number of pages15
JournalMetallurgical Review of MMIJ (Mining and Metallurgical Institute of Japan)
Volume10
Issue number2
Publication statusPublished - 1994 Dec 1
Externally publishedYes

ASJC Scopus subject areas

  • Metals and Alloys

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