Laser-induced macrofluorescence of coal: oxidation and spectral effects

Death, David L.; Eberhardt, John E.; Read, Russell

doi:10.1016/0016-2361(91)90261-8

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2007

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Cited by 10 publications

(2 citation statements)

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“…Many workers have described the microscopic fluorescence characteristics of various types of macerals. – Vitrinite, liptinite, and resinite are the most common fluorescing materials. Liptinite (much brighter than others) maceral fluoresce more brightly then vitrinites, which in turn fluoresce more brightly the inertinites.…”

Section: Introductionmentioning

confidence: 99%

Laser-Induced Fluorescence Spectra of Some High-Sulphur Assam Coals, India

Saikia¹,

Boruah²,

Baruah³

2007

Energy Fuels

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Section: Introductionmentioning

confidence: 99%

Laser-Induced Fluorescence Spectra of Some High-Sulphur Assam Coals, India

Saikia¹,

Boruah²,

Baruah³

2007

Energy Fuels

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“…In this regard, Death et al (16,17) used a HeCd laser operating at 325 and 442 nm to demonstrate that luminescence emission intensity from pressed or powdered coal surfaces decreased with degree of thermal and chemical oxidation. Except for some difficulty in maintaining stability of their photomultiplier, they suggested that the method might be suitable for on-line discrimination of oxidized coal using run-of-mine particles.…”

Section: Introductionmentioning

confidence: 99%

Surface Properties of Photo-Oxidized Bituminous Coals: Final report

1998

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Natural weathering has a detrimental effect on the hydrophobic nature of coal, which in turn can influence clean-coal recovery during flotation. Few techniques are available that can establish the quality of coal surfaces and that have a short analysis time to provide input for process control. Luminescence emissions which can be quantified with an optical microscope and photometer system, are measurably influenced by degree of weathering as well as by mild storage deterioration. In addition, it has been shown that when vitrinite is irradiated with a relatively high intensity flux of violet-or ultraviolet-light in the presence of air, photo-oxidation of the surface occurs. The combination of measuring the change in luminescence emission intensity with degree of surface oxidation provided the impetus for the current investigation.

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