Thermodynamic properties of molten sulfides: Part II. The system Co-S
- PDF / 308,197 Bytes
- 3 Pages / 603.28 x 783.28 pts Page_size
- 81 Downloads / 165 Views
R. FOSNACHT,
RAJENDRA
P. GOEL,
AND
JOSE
M. LARRAIN
The 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 of s u l f u r v a p o r over Co-S m e l t s has been d e t e r m i n e d by e q u i l i b r a t i n g the m e l t s with H2S-H2 gas m i x t u r e s at t e m p e r a t u r e s r a n g i n g f r o m 1378 to 1617~ and for melt c o m p o s i t i o n s r a n g i n g f r o m a p p r o x i m a t e l y cobalt s a t u r a t i o n up to about 31 wt pct s u l f u r . As in a p r e v i o u s publication f r o m these l a b o r a t o r i e s , 1 an optical i n t e r f e r o m e t e r was employed to m o n i t o r the s y s t e m ' s a p p r o a c h to e q u i l i b r i u m and to a n a lyze the c o m p o s i t i o n of the e q u i l i b r i u m gas phase. A c o r r e l a t i o n b a s e d on the e x p e r i m e n t a l data and that of other i n v e s t i g a t o r s is d e s c r i b e d . The c o r r e l a t i o n is b a s e d on the a s s u m p t i o n of s p e c i e s in s o l u t i o n , and r e p r o d u c e s well all t h e r m o d y n a m i c p r o p e r t i e s of Co-S m e l t s .
T HIS is p a r t
of a s e r i e s of studies at the S t a n l e y T h o m p s o n L a b o r a t o r i e s of the H e n r y K r u m b School of M i n e s , C o l u m b i a U n i v e r s i t y , on s y s t e m s of m o l t e n s u l fides. In this paper, the r e s u l t s of e q u i l i b r i u m s u l f u r p r e s s u r e d e t e r m i n a t i o n s over Co-S m e l t s a r e p r e s e n t e d . Sulfur c o m p o s i t i o n s v a r i e d f r o m close to cobalt s a t u r a t i o n up to about 31 wt pct s u l f u r . The t e m p e r a t u r e r a n g e studied was 1378 to 1617~ The data obtained s u p p l e m e n t the work of R o s e n q v i s t 2 at lower t e m p e r a t u r e s (901 to 1269~ and of B a r e n 3 at lower s u l f u r contents (less than 0.77 wt pct s u l f u r ) . EXPERIMENTAL E s s e n t i a l l y the s a m e e q u i p m e n t and p r o c e d u r e as used by M e y e r e t al 1 for Ni-S m e l t s was employed in this i n v e s t i g a t i o n . T h i s p u b l i c a t i o n should be consulted for the e x p e r i m e n t a l d e t a i l s , only highlights will be presented here. F o r v a r i o u s t e m p e r a t u r e s , g a s e o u s m i x t u r e s of H2S and H2 were bubbled through Co-S m e l t s held in a c r u c i b l e . A p p r o p r i a t e p r e c a u t i o n s , as given by M e y e r , 4 were taken to avoid the effects of t h e r m a l diffusion. E q u i l i b r i u m conditions were e s t a b l i s h e d through m a n i p u l a t i o n of the inlet gas c o m p o s i t i o n . Once e q u i l i b r i u m was e s t a b l i s h e d , a s a m p l e of melt was e x t r a c t e d by s u c t i o n into a quartz tube and was s u b s e q u e n t l y quenched in w a t e r . D e v i a t i o n s f r o m t h e r m o d y n a m i c e q u i l i b r i u m were detected by c o m p a r i n g c o m p o s i t i o n s of the inlet and outlet g a s e s . The m e l t s were p r e p a r e d f r o m cobalt chips of 99.9+ pct
Data Loading...
