Study On The Microscopic Photometry Characteristics And The Change Rule Of Jurassic Coal In Northwest China

Jurassic coal resources in the northwest region is not only rich in resources but also excellent in quality, and it is an important coal base in China. Jurassic coal type, including the type of bituminous coal and anthracite, is rich in this area.This paper systematic study on microscopic photometry characteristics and change rules of coal in this area, it has certain theoretical and practical significance of finding out the relationship between the microscopic photometry characteristic parameters and coal quality parameters, predicting of coal quality change, guiding the clean and high efficiency utilization of coal resources.In this paper, the separation and enrichment of macerals by heavy liquid method, separation and extraction of pollen by nitrate screening method, separation and extraction of cuticle by Schulze solution screening method. Single macerals were separated, the average purity of vitrinite was78.32%, the average purity of inertinite was78.87%, the average purity of exinite was 48.10%. Single macerals were separated, the average purity of vitrinite was78.32%, the average purity of inertinite was78.87%, the average purity of exinite was 48.10%. Pollen was identified as 9 class(line) 46 genera and 104 species. Cuticle was identified 3 class 3 genera and 11 species. We took Pityosporities pollen and Pterophyllum cuticle as the research object typical types of research of characteristic parameter of transmitted light and fluorescence characteristic parameter.Through the microscope photometer, we systematically studied the characteristic parameters of the reflection and transmitted light and fluorescence of Coal, pollen samples, cuticle samples of typical coals(long flame coal, non-caking coal and weakly caking coal, gas coal, coking coal, anthracite) of different coal ranks in the Northwest of China, sketched out the correspondence between different microscopic photometry characteristic parameters and coal ranks and the change rule of different microscopic photometry characteristic. Research results of reflection characteristic parameter show, the maximum reflectivity of coal is increased with t coal ranks. Research results of transmitted light characteristic parameter show, with the increase of coal ranks, exinite(especially pollen, cuticle) transmitted light characteristic parameter changes significantly, visual transmittance, tristimulus values, luminance coefficient decreased, hue dominant wavelength gradually increased, color saturation increases first and then decreases. Research results of fluorescence characteristic parameter show, exinite and desmocollinite of vitrinite in the low metamorphic degree of coal has good fluorescence response, with the increase of coal ranks, exinite(especially pollen, the cuticle) the fluorescence intensity of exinite(especially pollen, cuticle) decreases, the maximum fluorescence intensity in the fluorescence spectra decreases continuously, red and green quotient increases, the wavelength of the maximum fluorescence intensity is gradually moving towards the long wavelength direction. The fluorescence intensity of desmocollinites was significantly weaker than exinite, and with the degree of metamorphism decrease after increase.By Pearson correlation coefficient, the correlation between 5 kinds of microscopic photometry characteristic parameters were analyzed, correlation betweent microscopic photometry characteristic parameters and characteristic parameters of coal quality were analyzed. The results show that, Coal quality characteristic parameters and microscopic photometry characteristics of maximum reflectivity, visual transmittance, tristimulus values, luminance coefficient, fluorescence intensity, maximum fluorescence intensity of fluorescence spectrum and its corresponding wavelength in correlation are highly mathematical correlation, the correlation of maximum reflectivity of macrinite in reflection characteristic parameters, visual transmittance in transmitted light characteristic parameters, maximum fluorescence intensity of fluorescence spectrum in fluorescence characteristic parameters are the best. The correlation of maximum reflectivity of different macerals are highly mathematical correlation, the maximum reflectivity of macrinite has the best correlation with different reflection characteristic parameters. The visual transmittance, tristimulus values, luminance coefficient and other transmitted light characteristic parameters are highly mathematical correlation, and the visual transmittance has the best correlation with different transmitted light characteristic parameters. The characteristic parameters of fluorescence intensity and fluorescence spectral characteristic parameters of pollen, cuticle and other fluorescence characteristic parameters are highly mathematical correlation, and the maximum fluorescence intensity of fluorescence spectra has the best correlation with different fluorescence characteristic parameters. Visual transmittance, tristimulus values,luminance coefficient, the hue dominant wavelength and the fluorescence characteristic parameters were highly mathematical correlation. The visual transmittance has the best correlation with different fluorescence characteristic parameters. The maximum fluorescence intensity has the best correlation with different transmitted light characteristic parameters.