ESTONIAN ACADEMY
PUBLISHERS
eesti teaduste
akadeemia kirjastus
PUBLISHED
SINCE 1952
 
Proceeding cover
proceedings
of the estonian academy of sciences
ISSN 1736-7530 (Electronic)
ISSN 1736-6046 (Print)
Impact Factor (2020): 1.045

Application of diffuse reflectance spectroscopy for quick laboratory assessment of Estonian oil shale quality; 134–142

Full article in PDF format | https://doi.org/10.3176/proc.2020.2.04

Authors
Iram Tufail, Peeter Paris, Indrek Jõgi, Märt Aints, Andres Siiman, Hella Riisalu, Matti Laan

Abstract

Diffuse reflectance spectroscopy in near infrared region was used as a fast laboratory method for quantitative assessment of the calorific value and the moisture content of Estonian oil shale. Samples of different caloricity were collected from Narva open-cast mine and from beneficiation plant of Estonia underground mine, Estonia. The set of crushed oil shale samples, which moisture content was varied were tested by the help of a commercial multipurpose analyser, where Fourier-transform spectrometer recorded spectra in near infrared region and the software used partial least squares regression method. Results were related to the values of caloricity and moisture content, obtained by the bomb calorimeter and weighing methods, respectively. Bands characterizing organic and inorganic parts of the samples as well as the presence of the free water were ascertained by the infrared spectroscopy. Using the software provided by the analyser, the calorific value and the moisture content of samples were predicted. The prediction error of the lower caloricity was 1 MJkg–1 and prediction error of the weight percent of the moisture content was 1.35%. The comparison between achieved results and the values obtained from earlier laser-induced breakdown spectroscopy (LIBS) measurements shows that in laboratory conditions more precise prediction can be made by diffuse reflectance measurements. Further improvement of the prediction accuracy could be achieved by modified software which considers observed nonlinear effects in spectra.


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