Electro-extraction of molybdenum from Mo 2 C-type carbide
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the m o l y b d e n u m p r o c e s s m e t a l l u r g y , a g r e a t d e a l of I n v e s t i g a t i o n s r e p o r t e d tn l i t e r a t u r e d e a l t with the electro-chemical routes for metal extraction. Zadra and C o m e s ~ could s e l e c t i v e l y e x t r a c t m o l y b d e n u m f r o m s e h e e l t t e c o n c e n t r a t e s In an open e l e c t r o l y t i c c e l l . The t e c h n i q u e was l a t e r m o d i f i e d b y Hetnen and Z a d r a 2 to Include e l e e t r o w l n n t n g of 99.9 p e t m o l y b d e n u m f r o m m o l y b d e n u m t r i o x i d e d i s s o l v e d in b o r a t e - c h l o r i d e f l u o r i d e e l e c t r o l y t e s . Helnen, and B a k e r 3 e x t e n d e d the w o r k to s t u d y r e p e t i t i v e e I e c t r o l y s i s f o r winning m o l y b d e n u m . In a l l t h e s e I n v e s t i g a t i o n s c u r r e n t e f f i c i e n c y f o r the m e t a l d e p o s i t i o n was b e t t e r than 90 pet. Khlebntkov, and N a d o l s k t t 4 d e m o n s t r a t e d the f e a s i b i l i t y of electrowlnntng molybdenum from calcium molybdate on a l a b o r a t o r y s c a l e . C a m p b e l l , and J o n e s s in t h e i r e x t e n s i v e l i t e r a t u r e s u r v e y on m o l y b d e n u m e l e c t r o d e p o s i t i o n I n d i c a t e d that the only s u c c e s s f u l e l e c t r o d e p o s i t i o n w o r k c a m e f r o m Senderoff, and B r e n n e r . 6 The m e t h o d Involved e l e c t r o l y s i s in an i n e r t a t m o s p h e r e using a KC1-KsMoC16 e l e c t r o l y t e and a m o l y b denum anode. The h u n d r e d p e r c e n t anodtc c o r r o s i o n l e d the a u t h o r s to c o n c l u d e that the e l e c t r o l y t i c p r o t e s s was b e t t e r s u i t e d f o r e l e c t r o - r e f i n i n g o r e l e c t r o p l a t i n g . This a p p e a r e d f u r t h e r s u b s t a n t i a t e d in a r e c e n t l y r e p o r t e d w o r k of Cumtngs, C a t t o t r , and S u l l i van ~ who a c c o m p l i s h e d p r o d u c t i o n of 99.99 p e t p u r e m o l y b d e n u m f r o m s c r a p m e t a l u s e d a s an anode feed in I n e r t a t m o s p h e r e e l e c t r o l y s i s with a n u m b e r of h a l i d e - e l e c t r o l y t e s . The w o r k m a d e a r e c o m m e n d a tion on the u s e of the KC1-K~MoC16 e l e c t r o l y t e in which an a v e r a g e c u r r e n t e f f i c i e n c y of 60 p e t was a t t a i n e d . M o r e r e c e n t l y , In t h i s l a b o r a t o r y e x t e n s i v e i n v e s t i g a t i o n s w e r e e a r r l e d out on the e l e e t r o m e t a l l u r g t c a l r o u t e s of m o l y b d e n u m e x t r a c t i o n using t h i s well e s t a b l i s h e d KC1-KaMoC18 e l e c t r o l y t e . In a p r o c e s s i n v o l v i n g MoO,-C s o l u b l e anode e l e c t r o l y s i s , r e p o r t e d b y Surl, and Gupta, a a 90 p e t m o l y b d e n u m r e c o v e r y at an a v e r a g e c u r r e n t e f f i c i e n c y of 95 p e t was a c h i e v a b l e , In a n o t h e r p r o c
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