Title:
X-RAY FLUORESCENCE ELEMENTAL ANALYZER
Document Type and Number:
WIPO Patent Application WO2000016078
Kind Code:
A9
Abstract:
An apparatus for measuring the composition of coal and mineral ores on-line, by bombarding a sample stream with low energy X-rays and measuring the characteristic X-rays fluoresced. The assembly is comprised of one or more X-ray generators (20) mounted in a specific geometry with one or more silicon detectors (10). A representative sample of a flow stream is obtained from a sampling system. Sample presentation to the analyzer is done with a plow (50) or a flow cell to obtain a uniform interrogation zone for the analyzer. Elemental analysis (Aluminum through Silver on the Periodic Table) of the sample is computed from calibration curves generated from a linear relationship with count rates under each peak. Coal ash is determined from a function f (major elements in ash measured, backscattering of incident radiation). Moisture is determined from measuring the attenuation of a microwave beam transmitted through the sample.
Inventors:
LAURILA MELVIN J
BACHMANN CLAUS C
KLEIN ALBERT P
BACHMANN CLAUS C
KLEIN ALBERT P
Application Number:
PCT/US1999/020867
Publication Date:
September 08, 2000
Filing Date:
September 16, 1999
Export Citation:
Assignee:
PROCESS CONTROL INC (US)
International Classes:
G01N23/223; G01V5/00; G01N22/04; (IPC1-7): G01N23/223
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