Abstract

PINERES, Jorge; PERTUZ, Wilfran  and  CASTRO, Jeniffer. Effect of pH and agitation time on combustible recovery and ash rejection in a coal sample using selective hydrophobic coagulation. Ing. compet. [online]. 2018, vol.20, n.2, pp.99-108. ISSN 0123-3033.  https://doi.org/10.25100/iyc.v20i1.6408.

This paper shows the effect of pH and agitation time (Agt) on combustible recovery and ash rejection for a Colombian bituminous coal sample from Cerrejón (La Guajira), using a Selective Hydrophobic Coagulation process. A 22 factorial central composite experimental design was used, varying the pH and the agitation time as entry variables. The sample was processes in a specially built coagulation cell. The results show that the selectivity of the process is highest in a pH range of 4 to 10, with ash rejection values above of 70%. The statistical analysis showed that pH is a variable that has a significant effect (95% confidence level) in the selective hydrophobic coagulation process, while the agitation time has no significance effect.

Keywords : Selective Hydrophobic Coagulation; Ash Rejection; Combustible Recovery; Coal; Hydrophobicity.

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