Heavy-Duty 2.5m Disc Granulator for Mineral Fertilizer

Processing heavy mineral fertilizers—such as calcitic limestone dust, rock phosphate powder, dolomitic lime, and gypsum—presents unique manufacturing challenges. Mineral powders have high bulk densities, lack natural organic binders, and generate heavy mechanical loads during wet granulation. Standard pan granulators often suffer from frame flex, severe drive vibration, and inner disc caking.

As a direct fertilizer machinery manufacturer, we engineer custom heavy-duty disc granulators built specifically for dense mineral powder processing.

Currently in our workshop production line is our flagship 2.5-meter carbon steel pan granulator, featuring a reinforced heavy-duty structural steel frame, high-torque drive assemblies, and an innovative rotary scraper system designed to eliminate material sticking and optimize granule spherical formation.

Why Mineral Fertilizer Granulation Demands Heavy-Duty Engineering

Unlike lightweight organic composts, raw mineral powders exert extreme gravitational shear forces on the granulation pan:

• High Bulk Density: Heavy mineral dust requires a rigid structural base to prevent frame twisting and gear misalignment during rotation.

• Sticky Material Caking: Fine mineral powder pre-conditioned with liquid binders easily sticks to the pan bottom, reducing effective surface contact area and causing uneven particle sizes.

• Continuous Operational Stress: Industrial mineral processing plants require non-stop 24/7 operation without gear slip or bearing failure.

Core Engineering Innovations & Machinery Advantages

Our 2.5m carbon steel disc granulator addresses these processing bottlenecks through targeted structural features:

1. Heavy-Duty Carbon Steel Frame & Reinforced Base

The Problem: Standard thin-walled pan frames vibrate excessively under heavy mineral weight, leading to fatigue cracks and drive shaft strain.

Our Engineering Solution: Built with an extra-thick carbon steel triangular support frame and heavy structural channel beams. The back of the $2.5 ext{ m}$ granulation disc features radial heavy-gauge steel reinforcing ribs, ensuring zero disc deformation when loading tons of dense mineral slurry.

2. Unique Rotating Scraper System (Anti-Sticking & High Contact Area)

The Problem: Fixed scrapers only clean narrow static lines, leaving large wet mineral patches stuck to the pan, which reduces active rolling area and ruins pellet uniformity.

Our Engineering Solution: Our pan granulator integrates a specialized motorized rotary scraper device. The rotating scraper continuously clears the entire pan surface in real-time while sweeping wet mineral powder back into the main tumbling stream. This expands the active material contact area, prevents pan wall buildup, and boosts balling efficiency to >90%.

3. Heavy-Duty Gear Drive & Adjustable Inclination Angle

High-Torque Transmission: Equipped with forged steel drive gears and heavy cast-iron riding rings to handle high starting torques under full load.

Flexible Process Control: The pan tilt angle is easily adjustable between 35℃--55℃ via heavy-duty jack screws, allowing operators to fine-tune residence times and granule diameters (2.0--5.0 mm).

Step-by-Step Mineral Granulation Line Workflow

1. Pre-Mixing: Dry mineral powder is blended with liquid binder in a twin-shaft mixer to establish initial moisture (8%--12%).

2. Pan Tumbling & Nucleation: Pre-moistened powder feeds into the 2.5 m rotating disc. As the drum turns, liquid surface tension and tumbling action roll particles into dense spherical seeds.

3. Continuous Rotary Scraping: The motorized rotary scraper sweeps the pan surface continuously, preventing material caking and ensuring maximum surface contact.

4. Sizing & Discharging: Uniform 2.0--5.0 mm granules spill over the pan rim onto a belt conveyor, heading to the rotary drum dryer and vibrating screen.

Why Partner Directly with Our Machinery Factory?

Direct Workshop Manufacturing: Buy directly from our heavy machinery workshop with zero trading company markups and complete quality transparency.

Custom Material Modifications: We offer custom liner options—including stainless steel liners, rubber anti-corrosion linings, and variable frequency drive (VFD) speed controllers.

Turnkey Fertilizer Line Integration: We provide complete CAD/3D factory layout drawings, electrical control panels, and overseas installation guidance for complete mineral fertilizer plants.

Frequently Asked Questions

Q1: Why is a rotary scraper better than a fixed scraper for mineral fertilizer granulation?

A: Fixed scrapers only clear narrow static tracks on the pan bottom. A motorized rotary scraper actively spins across the disc surface, removing sticky mineral buildup across the entire contact zone while continuously lifting material back into the rolling mass, resulting in a higher balling rate (>90%).

Q2: What is the average production capacity of a 2.5m disc granulator?

A: For heavy mineral powders like limestone, rock phosphate, or dolomite dust, a 2.5 m disc granulator delivers a continuous throughput of 3.0--6.0 tons/hour, depending on material fineness and binder spray rates.

Q3: How do you adjust particle size on a pan granulator?

A: Granule size is controlled by adjusting three parameters: increasing the pan tilt angle reduces granule size; increasing rotation speed speeds up discharge; and adjusting liquid binder spray volume controls pellet density and seed formation rate.

Get Your Custom 2.5m Disc Granulator Quote & Workshop Video

Looking for a heavy-duty, reliable disc granulator for your mineral fertilizer production line? Partner with a direct machinery manufacturer to secure rugged equipment, custom factory engineering, and direct pricing.