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Non-hazardous coal briquettes were prepared from the blend of indigenous Lakhra coal containing high sulfur, slaked lime, used engine oil and bentonite clay. Briquettes were prepared with different compositions to observe the respective behavior of components. Raw coal and coal briquettes were characterized with ultimate and proximate analysis, TGA, emission gas analysis, mechanical strength, and smoke number. The optimized briquetting composition was observed as 72% raw coal, 16% bentonite clay as binder, 6% slaked lime and 6% used engine oil. Ignition time of this composition was reduced from 12 minutes to 6 minutes. Testo smoke number of coal briquette was much lower than that of raw coal, and higher amount of smoke in raw coal was reduced by briquetting. The heating value in optimized briquette batch 4 was higher as compared to other briquetting batches. TGA test showed that temperature rise per unit time was similar for both in raw coal as well as in coal briquettes, while the weight reduced per unit time was less for coal briquettes as compared to raw coal. Also the mechanical Strength was achieved up to 17.96 MPa. It was observed that mechanical strength was increased in coal briquettes with increase in amount of oil.

Facile application of used engine oil in high sulfur coal briquetting to reduce the hazardous emission gases