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Screening is an indispensable unit operation that is used extensively in many industries to separate particulate materials into different size fractions. A banana screen has high screening efficiency and is widely used for coal classification. In this study, the kinematic characteristics and velocity distribution of the banana screen surface during equal-thickness screening were investigated. High-speed dynamic test system results showed that the migration velocity and distance of different screen surface stages increase with running time from point 1 to point 5. Based on the experimental data and Box–Behnken response surface methodology results, the best screening effect occurred when the angle of eccentric block ψ  was 100°, the excitation frequency  f  was 34 Hz and the feed rate  Q  was 3 kg/s. Furthermore, the sequence of influencing degree of various factors on screening efficiency  η  followed the order:  f  &gt;  ψ  &gt;  Q . The actual screening efficiency was 92.993% when the operating conditions were ψ  = 103°,  f  = 32 Hz, and  Q  = 3.5 kg/s, indicating a satisfactory screening performance of coal using a banana screen.

Kinematic characteristics of banana screen surface and operational parameter optimization for coal classification