The action of sulfur trioxide on chalcopyrite
- PDF / 430,246 Bytes
- 4 Pages / 612 x 792 pts (letter) Page_size
- 33 Downloads / 186 Views
V E R Y l i t t l e is known about the r e a c t i o n of s u l f i d e s with SOs. S o m m e r and K e l l o g g 1 showed in b r i e f t e s t s that s p h a l e r i t e was c o n v e r t e d to zinc s u lf a te at 360 ~ to 527~ a c c o r d i n g to the equation: ZnS + 4SO 3 --* ZnSO 4 + 4SOs
[1]
At that t e m p e r a t u r e n e i t h e r oxygen n o r SO2 had any s i g n i f i c a n t a c t i o n on s p h a l e r i t e . J o n a s and Guth z r e a c t e d p y r i t e with p u r e SOs to get p u r e SOz s u i t a b l e f o r l i q u e f a c t i o n . The p r e s e n t study is c o n c e r n e d with the r e a c t i o n b e t w e e n c h a l c o p y r i t e and SOs.
EXPERIMENTAL T e s t s w e r e conducted on a - 4 0 0 m e s h c h a l c o p y r i t e flotation concentrate from Twin Buttes, Arizona analyzing 29.6 pct Cu, 23.6 pct Fe, and 29.6 pct S. Sulfur trioxide used was pure, colorless liquid SO3 marketed under the trade name Sulfanby Baker and Adamson. The supplier guarantees a minimum of 99.4 pct SO3, a maximum of 0.3 pct H2SO4, and 0.25 pct stabilizer (e.g., SbCl~, SbFs, or boron compounds), and a boiling point of 44.8~ The action of liquid as well as gaseous SO3 was investigated. In the first case, a flask containing 5.7 g chalcopyrite and I0 ml liquid SOs were contacted at room temperature with occasional shaking. The purpose of these tests was to use as low a temperature as possible in an attempt to eliminate the interaction of SOs with any elemental sulfur that might be liberated.s Nitrogen was used to flush the flask at the end of the test to vaporize away any unreacted SOs. In the second case, gaseous SOs was generated by boiling Sulfan at 50~ The amount of liquid SOs vaporized was 25 ml/h which equaled to 13,400 ml of gaseous SOs fla. Chalcopyrite as I g samples were charged in a porcelain boat in a transparent Vycor tube and heated in a hinged type tube furnace (Lindberg) with a temperature control •176 for 1 or 2 h. The upper half of the
f u r n a c e could be opened f o r i n s p e c t i n g the s a m p l e in the b o a t without i n t e r r u p t i n g the r e a c t i o n . At the end of e a c h t e s t , the flow of SOs and the h e a t ing w e r e stopped and the r e a c t i o n tube p u r g e d with ni t r o g e n f o r a s u f f i c i e n t t i m e to a s s u r e the a b s e n c e of a d s o r b e d SOs o r SO2 in the s a m p l e s . It was a l s o p o s s i b l e to r e m o v e the r e a c t i o n tube out of the f u r n a c e to a c c e l e r a t e the cooling. The s o l i d s a m p l e s w e r e then l e a c h e d with w a t e r to d e t e r m i n e the w a t e r - s o l u b l e c o p p e r and i r o n , while the t o t a l c o p p e r and i r o n w e r e d e t e r m i n e d in the r e s i d u e . Solubility in 5 pct HsSO4 was a l s o d e t e r m i n e d but t h e s e w e r e not included on the d i a g r a m s f o r the sake of c l a r i t y . All d e t e r m i n a t i o n s w e r e m a d e by a t o m i c a b s o r p t i o n . Although g r e a t c a r e h as b e e n t ak en in m i n i m
Data Loading...
