Determination of Activities in Slags Containing Chromium Oxides

Yanping Xiao, Lauri Holappa

    Research output: Contribution to journalArticleScientificpeer-review

    53 Citations (Scopus)

    Abstract

    Activities of CrO and CrO, 6 were determined in slags based on the systems of CaO-SiO2-CrOx, CaO-SiO2-MgO-CrOx, CaO-SiO2-Al2O3-CrOx, and CaO-SiO2-MgO-Al2O3-CrOx with electro-motive force method. Equilibrium was achieved between Cr-saturated CrAg alloy and slags. Effects of temperature and slag composition on the activities of chromium oxides and the oxidation state of chromium in the slags were investigated. Chromium oxides activities decreased but the divalent chromium fraction in the slags increased when elevating temperature in the range of 1500-1 600°C. The slag basicity has a significant effect, the higher the slag basicity, the higher the activities of chromium oxides, and the lower the divalent chromium fraction. By partial substituting MgO for CaO, activities of CrO and Cr015 will decrease, but the effect on the oxidation state of chromium in the slag is not obvious. Increasing Al2O3 content from 0 to 10mol% results in higher activities of chromium oxides and lower divalent chromium fraction. Further increasing of Al2O3 content to 20mol% does not cause any significant effect. In addition, activities of chromium oxides and oxidation state of chromium in a FeCr type slag system were examined.

    Original languageEnglish
    Pages (from-to)66-74
    Number of pages9
    JournalISIJ International
    Volume33
    Issue number1
    DOIs
    Publication statusPublished - 1993
    MoE publication typeA1 Journal article-refereed

    Keywords

    • chromium oxides
    • activity
    • oxidation state
    • slags
    • equilibrium
    • solid electrolyte

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