In this study, the effect of the pressing dynamics of a screw press on the mechanical strength of coal briquettes was investigated. The strength behaviour was examined under different ranges of the compressive force exerted by the screw. During the experiments, the following variables were selected as changing parameters: aqueous solutions of paraffin waste at concentrations of 5%, 7%, and 10%; aqueous solutions of distillery stillage (alcohol bard) at 10%, 15%, and 20%; binder liquid content of 10%, 11%, and 12%; nozzle diameters of 20, 25, and 30 mm; screw compressive forces of 1.8, 2.4, and 3 kN; and a working chamber diameter of 120 mm. The results revealed that when the nozzle diameter was Dₙ = 25 mm, the exponential curves on the strength–parameter graphs indicated that the briquettes prepared with a 15% aqueous mixture of distillery stillage and a 15% aqueous mixture of paraffin waste exhibited strength levels that met the required standards.

Paraffin waste, alcohol stillage, binder liquid, pressing force

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