Activities of Fe t O in CaO-Al 2 O 3 -SiO 2 -Fe t O (<5 pct) slags saturated with liquid iron
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9
ULOO
T
-
9
9 [] m 0.5
9
I
I I llllf
-
I
]0 eq.
5
ACS -2 ACS-4 ACS-5
zx O O
I
I IIIII
I
I~
ss. FeO A &
I llili
I
0.1 , 0.0001
@
I
I I IIlll
I
I IIIlll
I
I
I Illlll
0.01
0.001
0.1
A
9
2
l
ss. FeO 0 [] []
XFetO
T
~--
0.2
1873K
eq. O rq V D
CAS-5 CAS-8 CAS-9 CAS-10
Fig. 7 - - Activity coefficients of Fe,O(1) in CaO-AI203-SiO2 slags saturated with a CaO crucible.
& 2
SiO2
&
Fo,o
,or
,,
,\
40
60
\60
O @ @
1
0.5 0,0001
i
i
i I li|I]
i
J IJitll
0.001
I
0.01
I
J IlllJl
0.
XFetO Fig. 6--Activity coefficients of Fe,O(I) in CaO-AI203-SiO2 slags satarated with an A1203 crucible. VlETALLURGICALAND MATERIALSTRANSACTIONSB
CaO
9_0
80
(mass-%)
AI20 3
Fig. 8--Activity coefficients of Fe,O(1) plotted in CaO-Al203-SiO2 phase diagram. VOLUME 25B, DECEMBER 1994--899
-
I
I I IIIIl[
I
I I IIII1[
I
1873K
10
I
I IIIll
A
I
I
I
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I
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AA
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1
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t/.
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9
i
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T
1
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I
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AC
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A
CA
nl
V
I I Illlll
l
ACS-2 ACS-4 ACS-5
0.01 L
I I Illll
0.01
I
I
eq. FeO A A 0 9 0 I I Illll
0.0001
0.1
I
I
AI + 3/4SIO2 (s) = 3/4S_j + 1/2A1203 (s) J/mol [~~
(3/4) log as_i + log
1/2
i IIIlll
0.1
3/4
-~.
I IIItl
I
I
I
I Illll
I
I
t
IIItll
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Oo
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rn
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: CAS-5 CAS-8 CAS-9 CAS-IO
[10]
The activities of A1 are plotted against those of Si in logarithmic form in Figure 14 for the ACS slags in equilibrium, supersaturation, and FeO-slag experiments. The same relationships for the CAS slags are shown in Figure 15. In this case, the a m and a m values were evaluated by using the respective interaction parameters, except for those related to oxygen. It is apparent that all the data points fall on the same line with a slope of 3/4, as predicted from Eq. [10], irrespective of the experimental methods, except for a few data points marked by asterisks in the equilibrium ACS-2 experiments TM in Figure 14. This finding indicates that Reaction [9] is not influenced by the oxygen content in the bulk metal phase. The values of aAj2o~with respect to the solid standard state can be estimated from an intercept in a plot of log a m v s log asi by using the asio2 values of Rein and Chipman 16) and the respective interaction parameters tm for f~a and fs~ given in Table IV. These results, which are summarized in Table III, are plotted in Figure 16, 900--VOLUME 25B, DECEMBER 1994
I
0
[9]
{(aAhO3)/(g9"~,s~o~,
I
10 _ 7_
The following relation is obtained by using the equilibrium constant K9 for Reaction [9]: ~.
I
0.01
Fig. 1 0 - - A c t i v i t y coefficients o f Fe,O(1) in CaO-AI203-SiO2 slags saturated with an AI203 crucible calculated from Reaction [5].
I
by solid circles in Figure 13 fall well on the lines for the results calculated from Eq. [8]. The error bars represent the standard deviation. The present results summarized in T
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