Electrical conductivity and optical reflectivity of coal dust-rock dust-water mixtures

Researchers at the US Bureau of Mines have designed and constructed a portable near-infrared monochromatic reflectance meter that measures the concentration of rock dust in homogeneous coal-dust/rock-dust mixtures to within +or-2 wt.% rock-dust over the range 0-100 wt.% rock dust. Unfortunately, the...

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Bibliographic Details
Published in:	IEEE transactions on industry applications Vol. 26; no. 1; pp. 171 - 174
Main Authors:	Lansberry, T.A., Badger, D.W., Sapko, M.J.
Format:	Journal Article Conference Proceeding
Language:	English
Published:	New York, NY IEEE 01-01-1990 Institute of Electrical and Electronics Engineers
Subjects:	01 COAL, LIGNITE, AND PEAT 400102 > Chemical & Spectral Procedures Alarm systems Automatic testing CARBONACEOUS MATERIALS COAL Conductivity measurement DISPERSIONS DUSTS Electric variables measurement ELECTRICAL PROPERTIES ENERGY SOURCES Exact sciences and technology Fires FOSSIL FUELS FUEL SLURRIES FUELS HYDROGEN COMPOUNDS INFRARED SPECTRA INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY Instruments Instruments, apparatus, components and techniques common to several branches of physics and astronomy MATERIALS MIXTURES MOISTURE Moisture measurement NATIONAL ORGANIZATIONS OXYGEN COMPOUNDS Particle measurements PHYSICAL PROPERTIES Physics Reflectivity RESEARCH PROGRAMS RESERVOIR ROCK SLURRIES SPECTRA SUSPENSIONS US BUREAU OF MINES US DOI US ORGANIZATIONS 010600 > Coal, Lignite, & Peat > Properties & Composition WATER Reflectivity Reflectometry Dust Electrical conductivity Coal Simultaneous measurement
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Summary:	Researchers at the US Bureau of Mines have designed and constructed a portable near-infrared monochromatic reflectance meter that measures the concentration of rock dust in homogeneous coal-dust/rock-dust mixtures to within +or-2 wt.% rock-dust over the range 0-100 wt.% rock dust. Unfortunately, the presence of moisture in the samples affects the accuracy of this instrument. The purpose of this research was to determine the feasibility of designing a meter that can automatically compensate for the presence of moisture in the dust and thereby avoid the necessity of drying the dust prior to testing. Specifically, this research was directed at determining if simultaneous measurement of the mixture's electrical conductivity and near-infrared reflectivity could be used to determine the mixture's moisture and rock-dust concentration simultaneously. It is concluded that the two-parameter approach is feasible.< >
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 None
ISSN:	0093-9994 1939-9367
DOI:	10.1109/28.52690