Coal and coal ash characteristics to understand mineral transformation : A case study from Senakin coal field Indonesia

Anggara, F. and Besari, D.A.A. and Mursalin, A. and Amijaya, D.H. and Petrus, H.T.B.M. (2021) Coal and coal ash characteristics to understand mineral transformation : A case study from Senakin coal field Indonesia. In: International Conference on the Ocean and Earth Sciences, 18-20 November 2020, Jakarta.

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Abstract

Coal ash is a material from coal combustion and recently is an economical source for the extraction of valuable elements such as rare earth elements and Yttrium (REY) and base metals. Eight coal samples from Senakin coal field were collected to identify their mineralogy composition in raw coal and coal ash. The ashing was carried out on coal samples at temperature 1000°C for 1 hour. The coal and coal ash samples were made polish section to identify the organic and inorganic constituents. In addition, the minerals in coal sampel were identified by X-ray diffraction analysis. From this study, organic constituent consist of vitrinite (60 - 71), liptinite (22 - 33) and inertinite (5 - 9). Minerals found in coal are kaolinite (25,78 - 46,90), pyrite (24,16 - 38,38), quartz (6,07 - 12,80), gypsum (4,81 - 10,34), chlorite (2,56 - 8,40), jarosite (0,72 - 4,63), hematite (0,96 - 3,81), calcite (0,37 - 5,07), Mg-calcite (0,11 - 3,20), dolomite (1,35 - 3,55), and siderite (1,22). Coal ash is composed of organic and inorganic components. Organic components found is unburned coal (3,09 - 8,55) derived from maceral which does not burn out, mainly inertinite group. While inorganic components found are fe-oxide mineral (40,36 - 54,55), quartz (24,55 - 33,64), mullite (5,09 - 7,82), cenosphere (7,45 - 10,91), pleiosphere (1,64 - 2,36), pyrite (0,18 - 1,27), and spinel (0,18 - 1,09). Fe-oxide minerals are interpreted derived from Fe-bearing minerals in coal samples such as pyrite, hematite, and siderite. Kaolinite which is the dominant mineral in coal is transformed to cenosphere, pleiosphere, and mullite. Quartz in coal ash derived from quartz in the coal sample because ashing temperature does not exceed the melting temperature of quartz. Characterization of the coal ash component can be used as a reference for the extraction method of valuable elements. © Published under licence by IOP Publishing Ltd.

Item Type: Conference or Workshop Item (Paper)
Additional Information: Cited by: 2; Conference name: 2020 International Conference on Ocean and Earth Science, ICOES 2020; Conference date: 18 November 2020 through 20 November 2020; Conference code: 169972; All Open Access, Gold Open Access
Uncontrolled Keywords: Calcite; Coal; Coal ash; Coal deposits; Coal industry; Earth sciences; Extraction; Hematite; Kaolinite; Mullite; Pyrites; Quartz; Rare earths; X ray powder diffraction; Ashing temperatures; Extraction method; Inorganic components; Mineral transformations; Minerals in coals; Organic components; Organic constituents; Rare earth elements and yttrium (REY); Coal combustion
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Divisions: Faculty of Engineering > Geological Engineering Department
Depositing User: Sri JUNANDI
Date Deposited: 30 Aug 2024 07:24
Last Modified: 30 Aug 2024 07:24
URI: https://ir.lib.ugm.ac.id/id/eprint/5291

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