Analytical Methods for Coal and Coal Products. Volume II by Clarence Karr (Eds.)

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By Clarence Karr (Eds.)

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W e shall a s s u m e t h a t t h e r e s e a r c h e r is r e a s o n a b l y w e l l i n f o r m e d , a n d o b t a i n s d m m f a n a l y s e s of r e a c t a n t a n d p r o d u c t as f o l l o w s : Coal: Product: 8 2 . 0 0 % C, 5 . 3% S, 9 . 6 % O 7 5 . 0 0 % C, 5 . 0 6 % H, 1 . 17% S, 1 6 . 5 0 % O T h e s e d a t a tell t h e r e s e a r c h e r , c o r r e c t l y , t h a t s o m e C , H , a n d S h a v e b e e n r e m o v e d b y the oxidation, and m u c h O added. But they give a quite m i s l e a d i n g i m p r e s s i o n o f the q u a n t i t a t i o n , b e c a u s e s o m e o f the m i n e r a l m a t t e r w i l l h a v e b e e n s o l u b i l i z e d , a n d t h e m a s s o f p r o d u c t w i l l differ from t h e m a s s o f c o a l t a k e n for t h e e x p e r i m e n t (a) b e c a u s e s o m e o r g a n i c m a t t e r will h a v e b e e n s o l u b i l i z e d , a n d t h e m a s s o f p r o d u c t w i l l differ from t h e m a s s of coal t a k e n for t h e e x p e r i m e n t , ( b ) s o m e o x y g e n h a s b e e n a d d e d , a n d (c) s o m e m i n e r a l m a t t e r h a s b e e n r e m o v e d .

A c c o r d i n g to B a r n e s ( 1 9 7 7 ) , p y r i t e a n d h e x a g o n a l p y r r h o t i t e f o r m a s e r i e s o f s o l i d s o l u t i o n s , s o m e o f w h i c h are i n s o l u b l e i n a c i d s o t h e r t h a n n i t r i c ; t h e c o m p o s i t i o n h a s to b e d e t e r m i n e d b y x - r a y diffraction. T h e t e n d e n c y o f p y r r h o t i t e to b e o x i d i z e d u n d e r t h e c o n d i t i o n s o f l o w t e m p e r a t u r e a s h i n g is n o t k n o w n , so far as w e are aware.

C o n s e q u e n t l y a s h y i e l d s w e r e v e r y l o w ( u s u a l l y 1 - 2 % ) , a n d total sulfur w a s also l o w ( 0 . 6 - 1 % ) , so t h a t m o s t o f it w o u l d h a v e b e e n o r g a n i c . In t h e s e c i r c u m s t a n c e s falsification o f o x y g e n - b y - d i f f e r e n c e w o u l d h a v e b e e n s m a l l , t h o u g h p r o b a b l y not n e g l i g i b l e . O b v i o u s l y , if o n e w i s h e s to e x p r e s s t h e c o n t e n t o f a f u n c t i o n a l g r o u p as a fraction o f total o x y g e n , a d m m f v a l u e for the latter s h o u l d b e u s e d .

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