I. Tufail, P. Paris, I. Jõgi, M. Aints, A. Siiman, H. Riisalu, M. Laan
{"title":"Application of diffuse reflectance spectroscopy for quick laboratory assessment of Estonian oil shale quality","authors":"I. Tufail, P. Paris, I. Jõgi, M. Aints, A. Siiman, H. Riisalu, M. Laan","doi":"10.3176/proc.2020.2.04","DOIUrl":null,"url":null,"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 Fouriertransform 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 laserinduced breakdown spectroscopy (LIBS) measurements shows that in la boratory 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.","PeriodicalId":54577,"journal":{"name":"Proceedings of the Estonian Academy of Sciences","volume":null,"pages":null},"PeriodicalIF":1.0000,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Proceedings of the Estonian Academy of Sciences","FirstCategoryId":"103","ListUrlMain":"https://doi.org/10.3176/proc.2020.2.04","RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"MULTIDISCIPLINARY SCIENCES","Score":null,"Total":0}
引用次数: 0
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 Fouriertransform 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 laserinduced breakdown spectroscopy (LIBS) measurements shows that in la boratory 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.
期刊介绍:
The Proceedings of the Estonian Academy of Sciences is an international scientific open access journal published by the Estonian Academy of Sciences in collaboration with the University of Tartu, Tallinn University of Technology, Tallinn University, and the Estonian University of Life Sciences.
The journal publishes primary research and review papers in the English language. All articles are provided with short Estonian summaries.
All papers to be published in the journal are peer reviewed internationally.
The journal is open to word-wide scientific community for publications in all fields of science represented at the Estonian Academy of Sciences and having certain connection with our part of the world, North Europe and the Baltic area in particular.