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Thermodynamics of Arsenic in FeOx-CaO-SiO2 Slags

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Abstract

The distribution of arsenic between calcium ferrite slag and liquid silver (wt pct As in slag/ wt pct As in liquid silver) with 22 wt pct CaO and between iron silicate slag with 24 wt pct SiO2 and calcium iron silicate slags was measured at 1573 K (1300 °C) under a controlled CO-CO2-Ar atmosphere. For the calcium ferrite slags, a broad range of oxygen partial pressure (10–11 to 0.21 atm) was covered, whereas for the silicate slags, the oxygen partial pressure was varied from 10–9 to 3.1 × 10–7 atm. The measured relations between the distribution ratio of As and the oxygen partial pressure indicates that the oxidation state of arsenic in these slags is predominantly As3+ or AsO1.5. The measured distribution ratio of arsenic between the calcium ferrite slag and the liquid silver was about an order of magnitude higher than that of the iron silicate slag. In addition, an increasing concentration of SiO2 in the calcium-ferrite-based melts resulted in decreases in the distribution of arsenic into the slag. Through the use of measured equilibrium data on the arsenic content of the metal and slag in conjunction with the composition dependent on the activity of arsenic in the metal, the activity of AsO1.5 in the slags was deduced. These activity data on AsO1.5 show a negative deviation from the ideal behavior in these slags.

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Acknowledgments

The authors wish to thank Mr. Roy Hampson and Mr. Rowan Davidson for carrying out the experimental work. Financial support for this work was provided by CSIRO Process Science and Engineering and the former GK Williams Cooperative Research Centre for Extractive Metallurgy.

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Authors and Affiliations

  1. CSIRO Minerals Down Under National Research Flagship, Clayton South, VIC, 3169, Australia

    Chunlin Chen (Senior Research Scientist) & Sharif Jahanshahi (Theme Leader - Sustainable Processing)

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  1. Chunlin Chen
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  2. Sharif Jahanshahi
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Correspondence to Chunlin Chen.

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Manuscript submitted July 1, 2009.

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Chen, C., Jahanshahi, S. Thermodynamics of Arsenic in FeOx-CaO-SiO2 Slags. Metall Mater Trans B 41, 1166–1174 (2010). https://doi.org/10.1007/s11663-010-9430-0

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