Grate Discharge Ball Mill

Grate Discharge Ball Mill Specifications

AGICO supplies high-efficiency, energy-saving grate discharge ball mills of use rolling bearings instead of sliding bearings, resulting in 10–20% energy savings. Under the same installed power, production capacity can be increased by 10–20%.

Effective Volume: 4.0–69.8 m³
Maximum Grinding Media Load: 8–150 t
Production Capacity: 8.1–330 t/h
Suitable Materials: Various ores, rocks, and manufactured sand, such as: fly ash, limestone, quartz sand, aluminum powder, pulverized coal, steel slag, iron ore, iron slag, aluminum slag, silicon carbide, alumina, coal gangue, etc.

Applications: Grate discharge ball mills are widely used as mineral grinding mills for iron ores. They can also be used for grinding ferrous and non-ferrous metal mines, non-metallic mineral processing, building materials, and they are also used in chemicals, electric power, coal industry and other industries.

Grate Discharge Ball Mills Specifications

AGICO supplies following models of grate discharge ball mills of different sizes and processing capacities, we can also offer customization services for you once the requirements are received, if you want to know more about our ball mills, feel free to contact us now!

Model	Shell Size (Ø × L) mm	Effective Volume (m³)	Grinding Media Load (t)	Rotation Speed (r/min)	Installed Power (kW)	Discharge Size (mm)	Processing Capacity (t/h)
Notes: Discharge size (mm) indicates typical particle size range of the mill discharge (upper limit – lower limit, expressed in mm). Production capacity (t/h) is given as a range depending on feed material, grinding media, and circuit configuration. These models are wet grate type mills with rolling-bearing support (rolling bearings replaced traditional sliding bearings to improve efficiency).
AG-1530	1500 × 3000	4.0	8	27.6	75	0.8 – 0.074	12 – 2.8
AG-1835	1800 × 3500	7.58	16	25.3	160	0.8 – 0.074	25 – 5.8
AG-2136	2100 × 3600	11.0	19	23.8	210	0.8 – 0.074	29 – 6.5
AG-2145	2100 × 4500	13.8	22	23.8	250	0.8 – 0.074	36 – 8.1
AG-2445	2400 × 4500	18.2	37	22.8	400	0.8 – 0.074	55 – 10.5
AG-2745	2700 × 4500	23.0	50	21.7	500	3.0 – 0.074	180 – 15
AG-3245	3200 × 4500	32.8	65	18.6	800	3.0 – 0.074	235 – 29
AG-3260	3200 × 6000	39.2	81.6	18.6	1000	3.0 – 0.074	280 – 35
AG-3660	3600 × 6000	54.4	117	17.3	1400	3.0 – 0.074	310 – 38
AG-4060	4000 × 6000	69.8	150	16.0	1600	3.0 – 0.074	330 – 45

Advanced Designs of Grate Discharge Ball Mill

Grate Discharge Ball Mill Structure Drawing

1. Feeding Device	2. Bearing Section	3. Ring Seal
4. Feeding Section	5. Cylinder Section	6. Transmission System
7. Liner Lifting System	8. Discharging Section	9. Electric Motor
10. Foundation Drawing	11. Air Clutch	12. Trunnion Bearing
13. Coupling	14. Auxiliary Drive	15. Oil Lubrication Unit

Grease Lubrication: Dry grease lubrication is used to replace a high/low-pressure thin-oil lubrication station, reducing initial investment.

Easy Maintenance and Servicing: For grate discharge ball mills with diameters ≥ φ2700 mm, the following components can be equipped: a high-voltage motor, a pneumatic clutch, a large girth gear with grease spray lubrication, and a slow-drive device/inching drive for maintenance.

Multiple Models Available: Grate discharge ball mill is featured with grate plate at the discharge end; higher ball charge, greater installed power, high throughput; produces coarser discharge, typically used for primary grinding; overflow ball mill has no grate plate design, it has higher discharge level; Lower ball charge and installed power; produces finer discharge, it is suitable for secondary grinding.

Long Service Life of Bearings: Grate discharge ball mill is manufactured with high-strength bearings, the hollow shaft at the bearing section is reinforced with a larger diameter, increasing the radial distance between the rolling bearing and the feed/discharge screw. This improves heat dissipation, extends bearing life, and enhances capacity.

Working Principle of Grate Discharge Ball Mill

The grate discharge ball mill is a horizontal cylindrical rotating equipment driven by an outer gear (girth gear). It is a 2-chamber grate-discharge mill.

Feeding: Material enters through the feed assembly and feed trunnion via a feed screw.
First Chamber (Coarse Grinding): Equipped with Ladder liner or wave liner and different sizes of steel balls, the ball rotation produces centrifugal force, lifting steel balls and causing impact and grinding.
Intermediate Diaphragm: After coarse grinding, material passes through the single-layer diaphragm into the second chamber.
Second Chamber (Fine Grinding): Fitted with flat liners; further grinding occurs until the material reaches required fineness.
Discharging: Powder exits through the grate plate (discharge grate) to complete grinding.

Why Buy Grate Discharge Ball Mill from AGICO:

Grate Discharge Ball Mill Manufacture

Grate Discharge Ball Mill Delivery

Integrated Base Frame: Compact structure for easy installation and reduced civil construction work.
Flexible Feeding & Discharging Options: Multiple feeder and discharger configurations to suit different operating conditions.
High Throughput with Grate Discharge Design: Grate plate shortens slurry retention time, enables fast feeding and forced discharge, and delivers significantly higher capacity.
Durable Wave Liners: Wave-type liners increase grinding media contact efficiency while reducing liner wear.
High-Quality Girth Gear & Reliable Lubrication: Wear-resistant gear materials paired with a dependable lubrication system ensure long service life.
Energy-Saving Bearing Configuration: Double-row self-aligning roller bearings ensure proper alignment, easy start-up, and up to 30% power savings.
Integrated Drive Assembly: Gearbox and motor mounted on a single frame for easier operation, alignment, and maintenance.

Maintenance Tips for Grate Discharge Ball Mill

Grate discharge ball mills need maintenance and regular inspections. Here are the 15 most important tips for you, if you need more details or price of ball mills or have any technical problems, contact AGICO now!

Grate Discharge Ball Mill Front View

Grate Discharge Ball Mill Head View

Grate Discharge Ball Mill Side View

Grate Discharge Ball Mill 3d Model

Item	Maintenance / Inspection Requirement
1. Lubrication Oil Replacement	Drain all lubricating oil after one month of continuous operation, clean thoroughly, and refill with new oil. Replace oil every 6 months thereafter or during medium repair.
2. Lubrication Point Check	Check all lubrication points and oil level at least every 4 hours.
3. Main Bearing Temperature	During mill operation, the temperature rise of the main bearings shall not exceed 55°C.
4. Transmission Bearing & Gearbox Temperature	The temperature rise of the transmission bearings and gearbox shall not exceed 55°C, and shall not exceed 60°C at maximum.
5. Gear Set Condition	The girth gear and pinion shall run smoothly without abnormal noise. Adjust gear backlash as needed.
6. Vibration Condition	The ball mill shall operate smoothly without excessive vibration.
7. Motor Current	The motor current should remain stable without abnormal fluctuations.
8. Fasteners & Sealing	All fasteners must remain tight. No oil leakage, water leakage, or slurry leakage shall occur at any joint surface.
9. Grinding Media Addition	Add steel balls in time according to wear conditions.
10. Abnormal Condition Response	Immediately stop the mill and perform maintenance if any abnormal condition is detected.
11. Liner Wear Limit	Replace liners when worn by 70% or when cracks of approximately 70 mm appear.
12. Liner Bolts	Replace liner bolts if damaged or if liner loosening is detected.
13. Main Bearing Wear	Replace the main bearings when severely worn.
14. Grate Plate Wear (Grate Mill)	For grate-discharge mills, replace grate plates when wear reaches the point where welding repair is no longer possible.
15. Girth Gear Reuse	The girth gear may be reversed for continued use when the gear tooth surfaces reach the allowable wear limit.