Method of and apparatus for sensing the ash content of coal

Details Method of and apparatus for sensing the ash content of coal Method of and apparatus for sensing the ash content of coal

1982-01-15

1984-12-04

Smith, Alfred E.

X-ray or gamma ray systems or devices

Specific application

Fluorescence

378 88, 2503591, 250255, G01N 23203, G01N 23223

Patent

active

044868944

ABSTRACT:
The ash content of a granular coal sample having a moisture content greater than 10% by weight is sensed by bombarding it with primary radiation comprising at least two spectrums of energies (46 KeV and 9-17 KeV) to cause radiative reactions in the coal, sensing the secondary radiation generated by the radiative reactions caused by one of the two spectrums of energies (46 KeV), sensing the secondary radiations at a characteristic fluorescent energy of at least one element (e.g. iron) in the coal sample, the characteristic fluorescent energy being excited by the other of the two spectrums of energies (9-17 KeV), and using the sensed secondary radiations to determine the ash content of the coal.

REFERENCES:
patent: 3404275 (1968-01-01), Martinelli
patent: 3448264 (1969-06-01), Rhodes
Kneip, "Isotope Excited X-Ray Fluorescence", Anal. Chem., 44 (4), Dec. 1972, pp. 57A-68A.
Kawatra et al., "On-Line Measurements of Ash in Coal Slurries", Can. J. Spectrose., 21 (2), Mar./Apr. 1976, pp. 58-60.

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