Interaction of copper sulfides with copper oxides in the molten state
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of the r e s e a r c h d i r e c t e d at a b e t t e r u n d e r s t a n d ing of the c o n v e r t i n g p r o c e s s has c e n t e r e d a r o u n d t h e r m o d y n a m i c i n v e s t i g a t i o n s . ~-7 Kinetic and m e c h a n i s t i c s t u d i e s have b e e n r a t h e r l i m i t e d although s i g n i f i c a n t c o n t r i b u t i o n s have b e e n made by T h e m e l i s , 8 Szekely and T h e m e l i s , 9 and T h e m e l i s e t a l 1~ in the field of p r o c e s s a n a l y s i s with r e f e r e n c e to copper p r o c e s s m e t a l l u r g y . A j e r s c h and T o g u r i 11 have i n v e s t i g a t e d the r a t e of oxidation of m o l t e n c u p r o u s sulfide u n d e r c o n d i t i o n s of gas diffusion c o n t r o l . The o v e r a l l r e a c t i o n for the b l i s t e r f o r m i n g stage is often r e p r e s e n t e d b y the following s t o i c h i o m e t r y , Cu2S(/) + Ou(g~ = 2 Cu(/) + SO~(g)
The e x p e r i m e n t a l method used in this i n v e s t i g a t i o n c o n s i s t e d of continuous a n a l y s i s of the outlet gas m i x t u r e for s u l f u r dioxide and c h e m i c a l a n a l y s i s of final s a m p l e s withdrawn f r o m the melt. The gas a n a l y s i s obtained by gas c h r o m a t o g r a p h y was used a l o n g with d i r e c t v o l u m e m e a s u r e m e n t s of m o l t e n s a m p l e s to compute the s u l f u r dioxide g e n e r a t i o n r a t e per v o l u m e ( r s o 2) u s i n g a m a s s b a l a n c e and modified open s y s t e m t h e o r y . A s i m i l a r approach was used e a r l i e r by the a u t h o r s in c o n j u n c t i o n with k i n e t i c s t u d i e s on the r e d u c t i n n of m o l t e n sulfides by hydrogen.XS' 19
[1]
Reaction [1] is b e l i e v e d to be b e t t e r r e p r e s e n t e d by two s i m u l t a n e o u s p r o c e s s e s as follows, X2-15 2 CusS(l) + 3 O2(g) = 2 Cu20(/) + 2 SO2(g)
[2]
Cu~S~ + 2 Cu20(b = 6 Cu(~ + SO2(g)
[3]
While t h e r e is s o m e k i n e t i c e v i d e n c e ~6 that R e a c t i o n [1] t a k e s p l a c e d i r e c t l y , no c l e a r m e c h a n i s t i c i n t e r p r e tation of the p r o c e s s has b e e n proposed. In o r d e r to advance the u n d e r s t a n d i n g of these r e a c t i o n s it would a p p e a r that a study of r e a c t i o n s b e t w e e n copper s u l fides and copper oxides in the m o l t e n s t a t e would be the m o s t f r u i t f u l approach to take i n i t i a l l y . The l i t e r a t u r e a p p a r e n t l y c i t e s only one r e p o r t of a study r e lated to t h e s e r e a c t i o n s . Sergin e t a l x7 i n v e s t i g a t e d the k i n e t i c s of the r e a c t i o n b e t w e e n c u p r o u s sulfide in a m a t t e with c u p r o u s oxide in a CaO-Al2Os-SiO2 slag. The p r e s e n t r e s e a r c h was u n d e r t a k e n with the view of e s t a b l i s h i n g a m e c h a n i s m for the i n t e r a c t i o n of copper sulfides and copper oxides in the m o l t e n state. This i n f o r m a t i o n should p r
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