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Determination of moisture in black coal using pulsed nuclear magnetic resonance spectrometry

โœ Scribed by Nick G. Cutmore; Brian D. Sowerby; Leo J. Lynch; David S. Webster

Publisher
Elsevier Science
Year
1986
Tongue
English
Weight
723 KB
Volume
65
Category
Article
ISSN
0016-2361

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โœฆ Synopsis

Pulsed nuclear magnetic resonance (n.m.r.) spectrometry was investigated as a technique for moisture determination in fine product coal from eight Australian coal washeries. Measurements were made on samples of diameter 8 and 12 mm and length 10 and 120 mm at frequencies from 6.5 to 60 MHz. The ratio of intensities of the water and coal components in the free-induction decay signal can be used to determine moisture to within z 0.4-0.7 wt% over the range S-26 wt% moisture, independent of sample density. This accuracy is independent of particle size (up to 1 mm) and little affected by coal rank, sample length or n.m.r. frequency.

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