Method and apparatus for particle size determination in a host m

Details Method and apparatus for particle size determination in a host m Method and apparatus for particle size determination in a host m

1981-07-15

1984-06-05

Chin, Gary

Boots, shoes, and leggings

377 11, 324 714, G01N 2700

Patent

active

044532261

ABSTRACT:
A method and apparatus for determining the size distribution of certain particles, of a particular composition, such as iron sulfide (pyrites), in a sample of host material, such as coal. Data representative of the amount of at least one predetermined elemental constituent of the particles is obtained for each of numerous similarly-sized subsamples of the sample. The "constituent amount" data for each subsample is sorted into bins, each representative of a respective constituent amount range in a series of constituent amount ranges. Respective scaler representations of the fraction of the constituent amounts, represented by each bin range, are provided to yield an approximate representation of the distribution function of the amounts of the constituent in the subsamples of the coal. Those scaler representations collectively may provide a histogram. A selected multi-parameter distribution function, such as joint distribution function using both Gaussian and Poisson distributions, is fitted to the peaks of the binned grouping of representations forming the histogram, as by a least squares fitting technique, to obtain a best fit. The resulting values for two or more of the parameters of that function characterize the underlying size distribution of the certain particles in the sample. Three parameters include mean particle number density in the subsamples, mean particle radius which is a function of the mean normalized strength of the microprobe signal, and the variance in the radius.

REFERENCES:
patent: 3919050 (1975-11-01), Curby
patent: 3982183 (1976-09-01), Collineau et al.
patent: 4037101 (1977-07-01), Okumura et al.
patent: 4090074 (1978-05-01), Watt et al.
patent: 4318180 (1982-03-01), Lundquist et al.
"New Method for Sulphur Concentration Measurements in Coal and Char" by Solomon et al., Published in Fuel, vol. 56, Oct. 1977, pp. 393-396.

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