An HPGR crushes ore between two counter-rotating rolls (diameter D = 1.4 m, length L = 0.9 m here) that squeeze a bed of particles through a narrow "nip zone" instead of impacting single particles, so most of the applied energy goes into inter-particle breakage rather than noise and heat. The panel drives the standard mineral-processing relations:
F_total = F_sp · D · L (total hydraulic press force, kN)
Q = 3.6 · ρ · v · L · x₀ · Cf (throughput, t/h; Cf ≈ 0.85 gap fill factor)
Ecs = 0.62 · F_sp^0.78 (specific energy, kWh/t — empirical fit)
P = Ecs · Q (motor power draw, kW)
P80 = max(xf · e^(−0.16·F_sp), 0.15·x₀) (product 80%-passing size, mm)
Raising the specific press force squeezes the bed harder: product gets finer (lower P80) but specific energy and power both climb. Raising the operating gap lets more material through per revolution (higher Q) but also sets a floor on how thin the compacted "flake" can get, since flake thickness roughly tracks the gap itself. Roll speed scales throughput linearly without changing how hard each particle is squeezed.
- Particle color — shifts from ore-brown to hot orange as it crosses the pressure zone between the rolls, proportional to Fsp.
- Particle size — shrinks on exit to the computed P80, visualizing the reduction ratio live.