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By Clarence Karr (Eds.)

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Extra info for Analytical Methods for Coal and Coal Products. Volume II

Example text

In t h i s c h a p t e r w e t e n d to t r e a t a s s y n o n y m o u s t h e p h r a s e s " t o t a l i n o r g a n i c c o n t e n t " a n d m i n e r a l m a t t e r c o n t e n t ( i . e . , w e treat m i n e r a l m a t t e r as c o n s i s t i n g n o t o n l y of m i n e r a l s ) . W e finally r e c o m m e n d t h e p r o c e d u r e j u s t l i s t e d , w h i c h m a k e s n o u s e o f h i g h t e m p e r a t u r e a s h , for d e t e r m i n i n g the b e s t a p p r o x i m a t i o n to t h e total i n o r g a n i c c o n t e n t , a n d w e still m a i n t a i n that use of this will give valid d m m f analyses.

Coal Analysis and Mineral Matter 23 g r o u n d s t h a t a m a j o r p a r t o f t h e a s h - f o r m i n g c o n s t i t u e n t s is b o u n d d i r e c t l y to o r g a n i c m a t t e r r a t h e r t h a n i n d i s c r e t e m i n e r a l p h a s e s , t h e s e authors conclude that " t h e mineral-matter-free basis of expressing the results o f u l t i m a t e a n a l y s e s c a n b e j u s t as m i s l e a d i n g as e x p r e s s i n g r e s u l t s o n the d r y , a s h - f r e e b a s i s .

3) is - 0 . 0 9 , or - 0 . 0 8 i f o n e u s e s E q . (3a) ( - 0 . 0 9 8 i f t h e t e r m i n S 0 3 is o m i t t e d ) . T h e h y d r o g e n c o n t e n t o f c o a l s is a r o u n d 5 % , so that t h e c o r r e c t i o n s j u s t c a l c u l a t e d a r e n e a r l y 2 % o f t h e v a l u e , a n d are l a r g e r t h a n t h e p r e c i sion of the experimental determinations. W i t h m a n y coals, the corrections will b e less than those calculated, and the whole matter m a y app e a r trivial.

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