Coal will continue to play an important role in overall energy scenario in India. Despite its high-ash content, the run-of-mine (ROM) Indian coals are used directly for thermal power generation. There is an urgent need to improve quality of coal by reducing ash so that a consistent supply of quality coal can be supplied to the power plants. Pilot-scale studies were conducted on beneficiation of High Ash Indian Non Coking Coal obtained from the Samleshwari mines using a 20-t/h Baum Jig Washer. The results of the pilot-scale studies revealed that the ROM coal, containing 50% ash content, could be cleaned with the Baum jig providing a clean coal containing 36% ash at a yield of 52%.

In this study, response surface methodology was successfully applied to investigate the operating conditions of the froth flotation process used to recover coking coal fines obtained from a settling pond. A quadratic model was developed to evaluate the variation of yield and the grade of clean coal product with different test conditions.Thirteen experiments were carried out based on a central composite design technique.The analysis of variance was performed using design expert software to confirm the developed second-order model was statistically significant and adequate to represent the experimental observations. Using this technique, model coefficients, R 2 , R 2 adj , and Fvalues, were determined to analyze the developed models. Surface plots showing the relationship between the responses viz., wt% and ash% with process parameters, and also plots between experimental versus the predicted responses from the models are presented.

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