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By J.A. Short

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3 c o a l as a f u n c t i o n o f a r e a - e q u i v a l e n t p a r t i c l e diameter (ym). 4. ch004 i 1-20 21-40 41-βΟ 61-80 Mass Fraction of Mineral Matter (%) in Particle 81-100 F i g u r e A. D i s t r i b u t i o n o f c o a l and m i n e r a l matter i n Upper F r e e p o r t c o a l as a f u n c t i o n o f the m i n e r a l matter content o f the p a r t i c l e s . F i g u r e 5. D i s t r i b u t i o n o f i n d i v i d u a l m i n e r a l s i n Upper F r e e p o r t as a f u n c t i o n o f the m i n e r a l matter content o f the p a r t i c l e s .

Analytical methods commonly applied to the mineralogy of coal are c r i t i c a l l y surveyed. Conventional least-squares analysis of spectra was used to determine coal mineralogy on the basis of forty-two reference mineral spectra. The method described showed several limitations. 79 wt % of the ASTM ash (standard errors of prediction). Factor analysis based methods offer considerable potential in mineralogical and ash property applications. D e s p i t e c o n s i d e r a b l e e f f o r t t o u n d e r s t a n d the c h e m i c a l n a t u r e o f the o r g a n i c a n d i n o r g a n i c p o r t i o n s o f c o a l , and s u b s t a n t i a l advances i n i n s t r u m e n t a t i o n and m e t h o d o l o g i e s , much o f c o a l ' s c h e m i c a l n a t u r e remains i n t r a c t a b l e .

10-40. C. II (1980) and Vol. III (1981). N. 283-292. W. 53-65. 373-379. 258-267. , J . Inst. 109-115. Hodges, N . J . R. and Martin, T . G . , J . Inst. 158-169. C. , Prog. Energy Comb. S c i . 117-162. 30 28. 29. 30. 31. 32. 33. , Witczak, S. and Twardowska, I . 1134-1141. A. and Karner, F . R . , Ref. 38-51. A. and Holm, P . L . , Ind. Eng. Chem. Prod. Res. , 1985, 24, p. 145-149. N. , Geochim. et. Cosmochim. 2023-2043. Readett, D . J . and Quast, K . B . , Ref. 3, Paper A2:3. Electricity Trust of South Australia, South Australian Coalfields, 1986.

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