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Product Introduction
Our Double Roller Crusher for Grinding Preparation is a specialized, ultra-heavy-duty fine crushing system engineered specifically to optimize the feeding stage of grinding circuits (such as ball mills, rod mills, and vertical roller mills). In modern mineral and cement processing, the philosophy of "More Crushing, Less Grinding" is crucial for reducing energy costs. By installing this twin roll crusher directly before the grinding mills, it acts as a pre-grinding accelerator—shredding and micro-fracturing hard ores, cement clinker, limestone, and coke. This drastically reduces the feed particle size ($P_{80}$), creating micro-fissures within the rock matrix that significantly lower the Bond Work Index of the material before it enters the mill.
Technical Performance
Target Materials: Hard and abrasive mineral ores (iron, copper, gold), cement clinker, limestone, quartz, bauxite, and petroleum coke.
Production Capacity: Designed for continuous processing, delivering high-throughput rates from 10 to over 200 tons per hour.
Feed Sizing: Optimally processes pre-crushed intermediate materials sized between 20mm and 50mm.
Fine Pre-Grinding Discharge: Yields a highly uniform, fine product ranging from 1mm to 8mm, creating the ideal feed size for maximum grinding mill efficiency.
Moisture Versatility: Unlike fine screens or cone crushers that clog with sticky or damp fines, the positive squeezing action easily processes materials with variable moisture contents.
Working Principle
The equipment utilizes high-pressure, synchronized counter-rotation to crush and mechanically weaken the material structure:
Choke Feeding: The intermediate material is regulated and choke-fed into the crushing chamber to ensure an even distribution across the full width of the rollers.
Inter-Particle Compressive Crushing: As the twin rollers rotate toward each other at controlled speeds, materials are drawn into the narrowing gap. The immense mechanical pressure forces the particles to compress against one another, causing structural failure.
Micro-Fissure Generation: Beyond just breaking the rocks into smaller pieces, the intense localized pressure creates thousands of microscopic fractures and stress lines within the discharged particles.
Hydraulic Gap Safeguard: A heavy-duty, fast-acting hydraulic accumulator system maintains constant crushing pressure. If an uncrushable object (tramp metal) passes through, the movable roller retracts instantly to prevent damage, then seamlessly returns to its precise pre-grinding setting.
Key Features & Advantages
Boosts Grinding Mill Capacity by 20%–30%: By delivering a much finer and structurally weakened feed to your ball or rod mills, the grinding efficiency is heavily accelerated, leading to massive throughput jumps in the milling circuit.
Drastic Power Savings: Crushing is inherently more energy-efficient than grinding. Shifting the size-reduction workload from the ball mill to this double roller crusher slashes the overall energy consumption per ton of the entire comminution circuit.
Reduces Grinding Media Wear: Because the material entering the mill is already heavily fractured and downsized, the consumption rate of expensive grinding balls, liners, and rods is significantly reduced.
Ultra-Wear-Resistant Roll Shells: Outfitted with thick, replaceable roller segments made of advanced chromium-manganese alloys or tungsten carbide matrix surfacing, specifically engineered to withstand the continuous high-pressure abrasion of pre-grinding cycles.
Precise Control Over $P_{80}$ Product Size: The hydraulic shim or cylinder adjustment system provides absolute control over the roller gap, ensuring a strict, tightly bound particle size distribution with no oversized material passing through to the mill.
Applications: Ideally positioned as a pre-grinding unit in cement clinker production lines, fine-ore preparation loops in gold and iron beneficiation plants, and raw material preparation lines for chemical processing.
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