Abstract
In the present study, the technique of oil agglomeration has been explored with the aim of employing the process for recovery of coal fines from washery/coal industry effluents as well as deashing of coal. Both edible and non-edible vegetable oils have been tested for agglomeration of five different types of Indian coals widely used in power and metallurgical sectors. The yield of agglomerates ranged from 40.0 to 87.5% and ash rejections from 13.5 to 62.0% using different coal-oil combinations. Bacterial pretreatment of coal with mixed culture prior to oil agglomeration improved the selectivity of vegetable oils resulting in higher ash rejections (59.0−76.0%). Also, pretreatment of high sulphur coal with Thiobacillus ferrooxidans culture resulted in significant enhancement in pyritic sulphur rejection from 69.0 to 98.5%. Various process parameters have been optimized for vegetable oil agglomeration. Higher rates of biodegradation observed with vegetable oils as compared to that with petroleum fractions further supported their use as environmentally safe agglomerants.
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