Authors: N.I. Fedorova, E.S. Mikhaylova, V.Yu. Malysheva, Z.R. Ismagilov

Title of the article: Influence of coals ash content on qualitative characteristics of their ir spectra

Year: 2016, Issue: 2, Pages: 111-116

Branch of knowledge: Chemical technology

Index UDK: 662.74:543.422

DOI: -

Abstract: In the study of the structure of coals and coal products, various physical and chemical methods of research are widely used, including IR spectroscopy having a special place in that range. Mineral components are constituents of the coal structure, and their presence can significantly limit the resolving power of the IR spectroscopy. The article presents the results of the research of influence of coal ash content on qualitative characteristics of their IR spectra. Comparative analysis of the IR spectra of the initial and demineralized coals showed that the mineral components present in their composition in the form of silicates, carbonates and clay minerals, limit the resolving power of the method in the range of <970 cm-1, as their characteristic peaks are superimposed on the line of the organic mass of coals. Processing of coal with mineral acids contributes to reducing their ash content by 5-8 times, which increases the content of conditional organic substance in demineralized samples. In its turn, it leads to an increase in optical density of absorption bands in the entire range of the research and, consequently, permits to identify it more precisely.

Key words: coals elemental composition ash content acid demineralization IR spectroscopy

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