STUDI DENSIFIKASI BATUBARA PADA PROSES SINTERING DINGIN

AULIYA, KIAGUS MUHAMMAD FATHAN and Gunawan, Gunawan (2025) STUDI DENSIFIKASI BATUBARA PADA PROSES SINTERING DINGIN. Undergraduate thesis, Sriwijaya University.

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Abstract

The dominance of coal-based energy use in Indonesia contributes significantly to environmental impacts, so that more environmentally friendly utilization solutions are needed. One alternative developed is the manufacture of coal briquettes using cold sintering, an energy-efficient low-temperature powder compaction method. This study examines the effect of variations in the composition of sub-bituminous coal and starch on the physical characteristics (density, porosity), combustion efficiency, surface morphology, and crystal structure of the briquettes. Sub-bituminous coal was obtained from PT Bukit Asam, while starch serves as a binder. The composition variations include 90%:10%, 85%:15%, and 80%:20% (coal: starch). The molding process was carried out at a pressure of 365MPa and a temperature of 60°C for 10 minutes through a cold sintering technique. Density and porosity testing used a density meter; surface morphology was observed with Scanning Electron Microscopy (SEM) at magnifications of 1000×, 2000×, and 5000×; and crystal structure were analyzed via X-Ray Diffraction (XRD). The results showed that increasing starch content resulted in increased porosity and decreased density. The composition of 90% coal + 10% starch provided optimal performance, namely the highest density, lowest porosity, and best combustion efficiency. SEM results revealed a more pronounced pore structure in the composition with a higher starch content; at 5000× magnification, the surface morphology appeared very detailed. Meanwhile, XRD results showed that the main mineral phase of sub-bituminous coal did not experience significant changes. Keywords: Coal Briquettes, Cold Sintering, Porosity, Starch Powder, Density

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	Briket Batubara, Sintering Dingin, Porositas, Tepung kanji, Densitas
Subjects:	T Technology > TJ Mechanical engineering and machinery > TJ1125-1345 Machine shops and machine shop practice > TJ1133 Plans for buildings and shops Management of machine shops Drafting-room practice see TJ227+ T Technology > TJ Mechanical engineering and machinery > TJ1125-1345 Machine shops and machine shop practice > TJ1146 Cost of production T Technology > TJ Mechanical engineering and machinery > TJ1125-1345 Machine shops and machine shop practice > TJ1180 Machining, Ceramic materials--Machining-Strength of materials-Machine tools-Design and construction > TJ1180.A34 Machining T Technology > TJ Mechanical engineering and machinery > TJ1125-1345 Machine shops and machine shop practice > TJ1180 Machining, Ceramic materials--Machining-Strength of materials-Machine tools-Design and construction > TJ1180.A55 High-speed machining. Metal-cutting T Technology > TJ Mechanical engineering and machinery > TJ1125-1345 Machine shops and machine shop practice > TJ1180 Machining, Ceramic materials--Machining-Strength of materials-Machine tools-Design and construction > TJ1180.M27 Machining-Composite materials T Technology > TJ Mechanical engineering and machinery > TJ1125-1345 Machine shops and machine shop practice > TJ1185.87713 Metal cutting, Machine-tools
Divisions:	03-Faculty of Engineering > 21201-Mechanical Engineering (S1)
Depositing User:	Kiagus Muhammad Fathan Auliya
Date Deposited:	09 Sep 2025 08:09
Last Modified:	09 Sep 2025 08:09
URI:	http://repository.unsri.ac.id/id/eprint/183651

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