The effect of temperature on nickel solubility in silica saturated fayalite slags from 1523 to 1623 K
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INTRODUCTION
THE solubility of nickel in silica saturated fayalite slags has been measured by various workers 1-5 for temperatures ranging from 1473 to 1623 K. However, the data are somewhat inconsistent and no satisfactory relationship exists for the effect of temperature on nickel solubility. In this work the distribution of nickel between Ni-Au-Fe alloys and silica saturated slags equilibrated with known CO2/CO gas mixtures is reported for 1523 K and 1623 K. The data are combined with those for similar experimental work at 1573 K 3 to quantify the effect of temperature on nickel solubility. II.
The compositions of slags (smoothed to 100 wt pct oxides, with less than 5 pct correction in all cases) and alloys at equilibrium are listed in Table I. The Fe3+/Fe2+ ratios and SiO2 percentages for slags are in the expected ranges,I~ and the FeO-Fe203-SiO2 phase diagram ~1 shows that all compositions are liquid at the experimental temperatures. Figures 1 and 2 show the solubility of nickel in slag v s nickel in the alloy for 1523 K and 1573 K, respectively. The data of Wang e t a l . 2 for the same experimental system are included for comparison and discussed below. Activity of nickel oxide is calculated from [1] where aNiO(l) =
EXPERIMENTAL
Experimental procedures are identical to those described previously) Briefly, two grams each of an iron silicate slag (
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