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This case study explores the optimization of coal washing from nine distinct raw coals characterized by varying washability potentials. The raw materials, sourced from seam III to seam VIII, were initially crushed to 75 mm, with one coal crushed to 13 mm. The study separates the coals into two fractions (75-6 mm and 6-0.5 mm) with an objective to achieve a beneficial ash content of 16.5% to 17.5%. Two circuits were evaluated: Circuit I involved individual crushing and screening while Circuit II involved blending of raw coals. The results highlight production efficiency and composite yields for both processing methods.
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Composite Washingof Coals fromMultiple SourcesOptimizationcase study
RawCoals • 9 coals with different washability potential • From seam III to seam VIII • Raw coals were crushed to 75 mm • Only one coal was crushed to 13 mm • Separated into 2 sizes (75-6 & 6-0.5 mm)
Aim To beneficiate optimallyat an ash level of16.5 to 17.5 %
Circuit“I” • Each separately crushed & screened • Coarser 75-6 mm fraction • Smaller 6-0.5 mm fraction • Beneficiate each fractions to 17 % ash • Composite yield - Blended cleans
Circuit“II” • Blending of raw coals • Crushed & screened to, • Coarser 75-6 mm fraction • Smaller 6-0.5 mm fraction • Beneficiate both fractions to 17 % ash • Composite yield - Blended cleans
