The effect of slime characteristics on the adhesion performance of filter cake

A pressure filtration dehydration process for solid-liquid separation is essential throughout the wet coal preparation process, as the quality of coal products and the efficiency of downstream operations are directly influenced by the performance of the filtration system. This study investigates the key factors affecting the viscosity of the filter cake by analyzing the adhesion characteristics between coal slime with varying properties and the filter cloth of a pressure filter. The results show that the adhesive force reaches 96 mN when the ratio of clean coal to gangue is 10:90. When the gangue content is 85%, the adhesive force increases to 161 mN. The maximum adhesion is observed at a coal content of 10% and a moisture content of 19%. Moreover, particle size has little effect on sample hydrophobicity when it exceeds 0.045 mm. As the quartz content increases, the surface argillization degree also rises, resulting in stronger adhesion. However, even at 24% moisture content, the surface argillization does not reach saturation. These findings provide valuable theoretical support for developing filter press cleaning mechanisms, aiming to reduce manual intervention during discharge and enhance the automation level of filter press systems.