High-temperature heterogeneous equilibria in the unit activity approximation: III. The chlorination of idealized llmenit
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Table I. High-Temperature Heterogeneous Equilibrium Compositions Expressed as Mole Fractions X i as Functions o f Temperature and Ilmenite/Chlorine Weight Ratio (z. Carbon/llmenite Ratio Fixed at 3.8. Total Pressure is 101325 Pa (1 atm)
Temperature Compound
0.169 0.133 0.030 0.002 0.001 0.027 0.001 0.137 0.496 0.004
0.166 0.114 0.050 0.001 0.001 0.036 0.003 0.132 0.496 0.001
0.164 0.090 0.073 0* 0* 0.045 0.007 0.129 0.492 0*
(~ = 0.65)
TiCl4 FeCI3 FeCl~ Fe~C16 Fe~C1, c12 Cl c (s) co
0.174 0.094 0.058 0.004 0.007 0.001 0* 0.157 0.488 0.017
0.173 0.094 0.070 0.001 0.003 0.002 0* 0.143 0.510 0.004
0.171 0.085 0.083 0* 0.001 0.007 0.001 0.139 0.512 0.001
0.169 0.069 0.099 0* 0.001 0.014 0.004 0.137 0.507 O*
TiCI4 FeCI3
0.176 0.020 0.104 0.006 0.023 0* 0.159 0.494 0.018
0.174 0.020 0.133 0 0.Ol1 0* 0.143 0.515 0.004
0.173 0.020 0.145 0 0.004 0* 0.140 0.517 0.001
0.172 0.019 0.150 0 0.002 0.001 0.138 0.518 0*
CO2
FeTiOs + 7/2 Cl2 + 3 C ~ FeCI3 + TiCI4 + 3 CO
FeC12 FeCl2(liq)
a n d i s 0.71 f o r t h e p r o d u c t i o n of f e r r o u s c h l o r i d e
Fe2C1, Cl
F e T i O 3 + 3 C12 + 3 C ~ FeC12 + TIC14 + 3 C O .
T i O 2 ( s ) ~-~ TiO2(g) i s not a t e q u i l i b r i u m a t T = 1273 K a n d a = 0.65 s i n c e the m o l e f r a c t i o n o f TiO2 g a s i s 1.80 × 1 0 -30 l e a d i n g t o a n e q u i l i b r i u m p a r t i a l p r e s s u r e o f 2.10 A. R. CHUGHTAI and J. R. RITER, Jr., are Research Chemist and Professor of Chemistry, respectively, in the Chemistry Department at the University of Denver, Denver, CO 8 0 2 0 8 . H. M. HARRIS was Ceramic Research Engineer at the Albany Metallurgy Research Center, U.S. Bureau of Mines, A l b a n y , OR 9 7 3 2 1 (deceased June 5, 1977). Manuscript submitted April 29, 1976. METALLURGICAL
TRANSACTIONS B
1423 K
0.171 0.140 0.014 0.008 0* 0.019 O* 0.151 0.480 0.017
(a = 0.70)
T h e r a n g e of a w a s t a k e n a s 0.40 t o 1.00 w i t h t e m p e r a t u r e r a n g i n g f r o m 973 t o 1773 K . T h e t h e r modynamic d a t a were t a k e n p r i m a r i l y f r o m t h e J A N A F tables, 4 with B u r e a u of M i n e s publications used for F e z C l a ( g ) ,5 Ti2Oa(s, ~),6,v a n d F e T i O s ( s , l ) .8 T h e a c t i v i ties f o r pure s o l i d s a n d l i q u i d s are t a k e n as unity w i t h c o n d e n s e d p h a s e s o l u t i o n s not c o n s i d e r e d i n t h i s u n i t a c t i v i t y a p p r o x i m a t i o n .1-s T h e r e s u l t s f o r t h e c o m p l e t e d o m a i n of t h e i n d e p e n d e n t v a r i a b l e s a a n d T a r e p r e s e n t e d in F i g s . 1 to 4 . T h e s e f i g u r e s s h o w equilibrium p r o d u c t m o l e f r a c t i o n s a s f u n c t i o n s of t e m p e r a t u r e a n d or. M o r e detailed mole fraction r e s u l t s for a s m a l l e r d o m a i n of t h e s e i n d e p e n d e n t v a r i a b l e s a r e p r e s e n t e d i n T a b l e I . T a b l e II c i t e s s p e c i e s w h i c h w e r e c o n s i d e r e d i n t h e e q u i l i b r i u m c a l c u l a t i o n s but w e r
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