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

By Clarence Karr (Eds.)

ISBN-10: 0123999022

ISBN-13: 9780123999023

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Sample text

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.

Given 26 TABLE IV Comparison of Experimental and Mott-Spooner Calorific and Richard F. Yarzab Values" Mineral matter Mean Mott-Spooner Standard deviation 9 5 % confidence basis difference of differences interval on m e a n Parr -55 206 ±25 Modified Parr +26 182 ±27 0 For 265 coals. calorific v a l u e s is s i g n i f i c a n t l y l e s s i f t h e m o d i f i e d P a r r f o r m u l a , plus E q s . (11) a n d ( 1 2 ) , is u s e d c o m p a r e d w i t h t h e s i t u a t i o n i n w h i c h the o r i g i n a l P a r r f o r m u l a ( a l o n e ) is a p p l i e d .

F r o m c o m p a r i s o n s o f t h e u l t i m a t e a n a l y s e s (daf, total sulfur i n c l u d e d ) o f o r i g i n a l coal a n d r e d u c t i o n p r o d u c t , it w a s c o n c l u d e d that s o m e n i t r o g e n h a d b e e n a d d e d ( p r e s u m a b l y as irreversibly held d i a m i n e ) and oxygen introduced (oxidation of the p r o d u c t ? ) . E v e n t h o u g h t h e a s h y i e l d s a n d sulfur c o n t e n t s o f t h e c o a l s studied were low ( 1 . 5 - 5 and 0 .

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


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