Technical Report

How to Minimize Slime & Fines Generation in Modern Coal Preparation Lines

Advanced Roll Crushing Technology for Optimized Size Distribution

The Critical Impact of Over-Crushing

In coal preparation and power generation, producing excessive fine particles (coal slime) is a costly error. High dust and fine ratios not only decrease the market value of clean coal but also seriously complicate downstream washing and thermal recovery processes. Modern operations require a system that respects the material’s natural limits.

To achieve a narrow, predictable size distribution without creating a dust cloud, industrial plants are heavily transitioning toward Heavy-Duty Hydraulic Double Roller Crushers.

Optimized Gradation of Crushed Coal Particles

The Mechanics of Controlled Size Reduction

While impact mills forcefully shatter coal via dynamic collision, our heavy-duty rollers crush material through continuous hydraulic squeezing. The two alloy cylinders rotate inward at regulated speeds, drawing the raw coal down and cleaving it cleanly along its natural grid fractures.

Operational Advantage for Coal Terminals:
Because stones and lumps are only pressed until they match the exact physical gap between the rollers, there is zero unnecessary friction. This gap-controlled path guarantees a high yield of required fractions while keeping fines to an absolute minimum.

Roller Crusher

Engineered Performance for Harsh Mining Environments

• Elimination of Sticky Material Build-up

High moisture content causes traditional grates to blind and clog. The positive displacement of the twin rollers ensures that even sticky, wet coking coal or muddy wash-plant feeds pass through smoothly without stopping production.

• High Throughput with Low Kilowatt Demand

By utilizing static compression instead of throwing material at high velocities, the mechanical energy is fully optimized. Plants experience a 25% drop in power costs compared to traditional hammer or ring crushers.

• Smart Tramp Iron Release & Auto-Reset

Uncrushable elements like mine timber or roof bolts pose severe risks. The responsive hydraulic accumulators detect pressure spikes, instantly open the rollers to discharge the metal, and return to the set gap without downtime.

• Dust-Tight Sealing & Safety Compliance

To meet strict ambient air regulations, the entire unit features a robust, rubber-sealed cover framework. This encloses dust at the source, dramatically improving air quality on the plant floor.

Technical Parameters for Coal Processing Models

Model	Roll Size (D×W)	Max Feed	Capacity	Power
2PGY1000×1000	φ1000×1000 mm	≤ 60 mm	80 – 100 t/h	2 × (75-90) kW
2PGY1500×1200	φ1500×1200 mm	≤ 120 mm	150 – 200 t/h	2 × (132-160) kW
2PGY2000×1200	φ2000×1200 mm	≤ 120 mm	300 – 400 t/h	2 × (315-355) kW