Densification of coal fines and mildly torrefied biomass into composite fuel using different organic binders

Adeleke, A A and Odusote, J K and Lasode, O A and Ikubanni, P.P. and Malathi, M and Paswan, D (2019) Densification of coal fines and mildly torrefied biomass into composite fuel using different organic binders. Heliyon, 5(7) (Cite Score-1.66).

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Coal processing industries generate millions of tons of fines (<3 mm) during mining operation and are often considered as wastes. These wastes have enormous potential in serving as energy and metallurgical operation feedstock. One avenue for its use is densification into briquettes or pelletizes. Various briquetting techniques have been adopted in the past few decades; however, the main issues upfront in commercializing these techniques are significant binder cost and poor mechanical integrity. Therefore, the present study concentrates on utilizing commonly available organic binder along with pretreated biomass in developing coal fine briquettes. Briquettes were produced after initial pretreatment of the raw materials under a load of 2 tons. Briquettes were cured in an inert environment and eventually characterized for its main litmus requirements (physical properties). It was observed that pitch-molasses bonded briquettes have better physical properties leading to good mechanical integrity than briquettes produced from individual binder. The proximate, ultimate and calorific value analyses of the briquettes do not deteriorate but mildly improved compared to the raw coal fines. With a density of 1.18–1.32 g/cm3, drop to fracture that is greater than 100 (times/2 m), impact resistance index well above 6000, water resistance index of 99% and cold crushing strength of 9 MPa, pitch-molasses bonded briquettes clearly surpassed recommended physical properties benchmarked for briquettes of industrial and domestic end use. The physical properties of the briquettes favorably meet requirements as feedstock for rotary kiln direct reduced iron and COREX iron-making processes as well as fuel for thermal operations.

Item Type:Article
Official URL/DOI:
Uncontrolled Keywords:Metallurgical engineering;Coal dustBriquettes;Blended binder;CCS;IRI;Densification
Divisions:Material Science and Technology
ID Code:7992
Deposited By:Sahu A K
Deposited On:30 Sep 2019 12:16
Last Modified:18 May 2020 12:20
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