Steel rods replace steel balls, line contact replaces surface contact. High coarse grinding efficiency, low over-grinding, uniform discharge particle size. Ideal choice for sand shaping and coarse grinding operations, saving over 40% power compared to traditional equipment.
The rod mill is mainly used for coarse grinding of materials above 1mm. When grinding coarse materials, the rod mill has higher throughput than a ball mill of the same specification. Product particle size generally does not exceed 4.7mm maximum, minimum not less than 0.4mm, with feed size 80% less than 20mm to 4mm, and max feed size up to 50mm. The rod mill sand maker is versatile and a practical and reliable sand shaping equipment. Suitable for fine and medium crushing of various hard and brittle materials including abrasives, refractories, cement, quartz sand, steel shot, slag powder, copper ore, iron ore, gold ore, concrete aggregate, and asphalt materials. Especially suitable for adjusting fineness modulus in manufactured sand production — an efficient and energy-saving stone crushing and sand making equipment.
Material (particle size ≤50mm) is continuously fed into the rotating cylinder through the feed opening. A certain number of steel rods are pre-loaded into the cylinder as grinding media.
The cylinder rotates at 17-29 r/min. Steel rods are carried up to a certain height by the liner under centrifugal force and friction, in a cascading or cataracting state.
When steel rods fall, they strike material through line contact — first hitting coarse particles then grinding fine particles, reducing over-grinding. Rolling and grinding between steel rods further mills the material.
Ground material is discharged by overflow and the thrust of continuous feeding, entering the next process stage. The rod mill discharge end is equipped with a discharge grate plate to prevent steel rods from discharging.
| Model & Spec | Cylinder Dia. (mm) | Cylinder Length (mm) | Speed (r/min) | Discharge Size (mm) | Capacity (t/h) | Motor power (kW) | Weight (kg) |
|---|---|---|---|---|---|---|---|
| MBS0918 | 900 | 1800 | 29 | 0-5 | 3-8 | 22 | 4,500 |
| MBS0924 | 900 | 2400 | 29 | 0-5 | 5-25 | 45 | 12,000 |
| MBS1224 | 1200 | 2400 | 27 | 0-5 | 6-35 | 55 | 13,800 |
| MBS1530 | 1500 | 3000 | 23 | 0-5 | 7-45 | 90 | 17,000 |
| MBS1830 | 1830 | 3000 | 22.8 | 0-5 | 10-85 | 132 | 24,700 |
| MBS2130 | 2100 | 3000 | 20.9 | 0-5 | 30-100 | 210 | 34,000 |
| MBS2136 | 2100 | 3600 | 20.9 | 0-5 | 40-135 | 245 | 38,000 |
| MBS2430 | 2400 | 3000 | 20.9 | 0-5 | 50-150 | 320 | 50,000 |
| MBS2736 | 2700 | 3600 | 19 | 0-5 | 60-185 | 400 | 69,000 |
| MBS2740 | 2700 | 4000 | 19 | 0-5 | 70-215 | 500 | 81,000 |
| MBS3245 | 3200 | 4500 | 17.5 | 0-5 | 80-260 | 630 | 137,000 |
※ Capacity varies with material properties, feed size and other factors. Specifications subject to change without notice.
| Component | Function | Material / Features |
|---|---|---|
| Cylinder | Core rotating component, carrying steel rods and material through the grinding process, with length-to-diameter ratio typically 2:1~1.4:1 | Steel plate welded, flanged end covers |
| Steel Rod (Grinding Media) | Strikes and grinds material through line contact — hits coarse particles first then fine particles, low over-grinding | High-carbon Chromium Alloy Steel, Φ40-100mm diameter |
| Feeder | Continuously feeds material into the cylinder through spiral feeding. | Cast steel feed spiral + feed chute |
| Discharge Device | Overflow type discharge, with grate plate at discharge end to prevent steel rod discharge while allowing qualified fines to overflow. | Discharge Grate Plate + Discharge Hollow Shaft |
| Drive System | Drives cylinder rotation, motor transmits power through reducer and gear set. | Motor + Reducer + Gear Set |
| Liner | Protects cylinder inner wall, with lifting bars that carry steel rods to a certain height. | High Manganese Steel / Alloy Steel Liner |
| Main Bearing | Supports stable cylinder rotation, bearing total load of cylinder, steel rods and material. | Plain bearing, forced circulation lubrication |
Steel rods use line contact instead of ball mill's point contact. During grinding, they first strike coarse particles then crush fines, resulting in more uniform discharge particle size with good continuous gradation.
Steel rods preferentially act on coarse particles when striking ore. Already crushed fine particles are not easily re-crushed, effectively avoiding over-grinding with low powder content in finished product.
When grinding coarse materials above 1mm, the rod mill has higher throughput than a ball mill of the same specification, suitable for coarse grinding stage.
Saves over 40% power compared to traditional sand making equipment with low operating costs. Advanced controllable feed/discharge technology with appropriate grinding media increases output by nearly 50%.
High medium sand ratio, good particle shape with few sharp edges. Especially suitable for adjusting fineness modulus in manufactured sand production and sand shaping.
Can process various hard and brittle materials including quartzite, iron ore, copper ore, gold ore, slag and pebbles. Both dry and wet types available, adapting to different process requirements.
Mature structural design with reliable flange connection between cylinder and end covers. Steel rod replacement is simple with low daily maintenance, suitable for continuous production.
Core equipment in manufactured sand production lines, especially suitable for sand shaping and fineness modulus adjustment. Pebbles, granite, limestone etc. produce well-shaped manufactured sand after rod milling.
Coarse grinding stage for iron ore, copper ore, gold ore and lead-zinc ore, providing qualified particle size for subsequent ball milling and flotation. Classic choice for single-stage open-circuit grinding.
Cement raw material pre-grinding, quartz sand fine grinding, refractory raw material processing. Grinding and reuse of industrial byproducts such as steel shot and slag powder.
Grinding operations with high uniformity requirements for chemical and glass raw materials. Processing, crushing and sand making of ore materials such as potassium feldspar and quartzite.
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