By Richard & Bernard D. Blaustein, eds. Markuszewski

ISBN-10: 0841209901

ISBN-13: 9780841209909

ISBN-10: 0841211566

ISBN-13: 9780841211568

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Am. Chem. , 1981, pp. 401-414. ; ACS Symposium Series; American Chemical Society: Washington, DC, 1986. ch004 Coal Desulfurization and Demineralization by Molten Caustic Mixtures Richard Markuszewski, D. R. Mroch, G. A. Norton, and W. E. Straszheim Ames Laboratory, Iowa State University, Ames, IA 50011 Several bituninous coals have been treated with molten mixtures of NaOH plus KOH at 350-370°C in a 1:10 coalto-caustic r a t i o for 1 hour and then washed with water, dilute acid, and finally with water again.

8 (PT8) and I l l i n o i s No. 6 (IL6 or IL6A) coals are presented in Table I I . For the Pittsburgh coal cleaned under stand­ ard conditions (runs #3 and #16), 77-82% ash removal and 65-72% sul­ fur removal were achieved with recoveries around 85-90%. For the I l l i n o i s coal, (IL6 #6, IL6A #1, and IL6A #2), the ash and sulfur removal was better at 87-89% and 72-78%, r e s p e c t i v e l y , while recovery was lower at 75-79% on a moisture- and ash-free (MAF) basis. Improved Conditions. When more water was used for the washing step (PT8 #10) or when the wash water was heated to 100 C (PT8 #12), both ash and sulfur removals were improved for each step without apprecia­ ble decrease in recovery.

Total Sulfur Distribution? Remarks Product Weight? 0 200 mg/l PAAX 10 mg/l F1029-D 300 mg/l PAAX 2 mg/l F1029-D F1029-D f r a c t i o n s . The t o t a l sulfur r e j e c t i o n ranged between l 6 and 3 9 ? · The lower r e j e c t i o n r a t i o of 16% was accompanied by high s e l e c t i v i t y in p y r i t i c sulfur dispersion. This was due to the higher ( 1 0 mg/l) flocculant concentration which resulted in higher coal y i e l d ( 9 3 . 1 ? wt) in the flocculated f r a c t i o n . On the other extreme, when higher dispersant concentration ( 5 0 0 mg/l) was used with lower flocculant concentration ( 2 mg/l), much less coal was flocculated ( 7 7 ?

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Fossil Fuels Utilization. Environmental Concerns by Richard & Bernard D. Blaustein, eds. Markuszewski


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