Start with the MQ nominal diameter and wet grate-discharge arrangement, then identify shell and end liners, grates, pulp lifters, trunnion parts, bearing bushes, gear-drive parts, materials and inquiry requirements.
This page follows CITIC HIC's published MQ nominal-diameter series. Grates and pulp lifters for the wet discharge system are shown separately and are not mixed with overflow-discharge parts.
The model suffix identifies the nominal shell diameter. Shell length, grates, lifters, supports, drive and liner arrangement vary by project.
| Model Series | Nominal Shell Diameter | Shell Length / Discharge | Required Checks Before Manufacturing |
|---|---|---|---|
| MQ-15 | 1,500 mm | Wet grate discharge; length confirmed by project | Nameplate, general arrangement, grates, lifters, supports and drive |
| MQ-21 | 2,100 mm | Wet grate discharge; length confirmed by project | Nameplate, general arrangement, grates, lifters, supports and drive |
| MQ-24 | 2,400 mm | Wet grate discharge; length confirmed by project | Nameplate, general arrangement, grates, lifters, supports and drive |
| MQ-32 | 3,200 mm | Wet grate discharge; length confirmed by project | Nameplate, general arrangement, grates, lifters, supports and drive |
| MQ-36 | 3,600 mm | Wet grate discharge; length confirmed by project | Nameplate, general arrangement, grates, lifters, supports and drive |
| MQ-40 | 4,000 mm | Wet grate discharge; length confirmed by project | Nameplate, general arrangement, grates, lifters, supports and drive |
| MQ-45 | 4,500 mm | Wet grate discharge; length confirmed by project | Nameplate, general arrangement, grates, lifters, supports and drive |
| MQ-55 | 5,500 mm | Wet grate discharge; length confirmed by project | Nameplate, general arrangement, grates, lifters, supports and drive |
Mills in the same nominal-diameter series may have different lengths and discharge configurations. Grates, lifters and liners are not interchangeable by diameter alone.
The system covers shell liners, lifters, end liners, grates, pulp lifters, trunnion liners and grinding balls. Each position has distinct impact, wear and material-process requirements.
Shell Liner / Shell Plate
Protects the shell interior and works with lifters to control the movement of grinding balls and material. Confirm the arrangement, curvature, thickness, hole spacing, shell diameter, rotation direction and adjacent liners.
Material Selection: Confirm Cr-Mo alloy steel, high-chromium cast iron, rubber or composite liners according to impact, abrasive wear, slurry corrosion and shell zone.
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Lifter Bar / Lifter Plate
Lifts grinding balls and material and controls their trajectory. Confirm lifter height, profile, pitch, arrangement, hole pattern, shell diameter and rotation direction.
Material Selection: Confirm Cr-Mo alloy steel, high-manganese steel, rubber or composite construction according to impact energy, wear zones and service-life target.
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End Liner / Head Liner
Protects the feed-end or discharge-end head. Confirm the end, inner or outer ring, segmentation, curvature, hole pattern, rotation direction and interfaces with the throat or discharge structure.
Material Selection: Confirm Cr-Mo alloy steel, high-manganese steel, high-chromium cast iron or rubber-composite construction according to impact, wear and end stress.
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Feed Chute Liner
Protects the feed chute and material-impact zone. Confirm flow direction, segmentation, thickness, curved surfaces, hole pattern, drop height and feeder interface.
Material Selection: Confirm quenched-and-tempered wear plate, high-chromium cast iron, rubber or composite wear construction according to drop impact, abrasive wear and replaceability.
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Discharge Grate / Grate Plate
Controls the passage of correctly sized material while protecting the discharge end. Confirm aperture shape, open area, segmentation, curvature, hole pattern, rotation direction and plugging or wear records.
Material Selection: Confirm high-chromium cast iron, Cr-Mo alloy steel, high-manganese steel or rubber-composite construction according to impact, wear and aperture-retention requirements.
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Pulp Lifter / Discharge Lifter
Directs material passing through the grate to the discharge opening. Confirm vane direction, channel cross-section, inner or outer ring position, rotation direction, hole pattern and plugging records.
Material Selection: Confirm Cr-Mo alloy steel, high-chromium cast iron, rubber or composite construction according to erosion, wear, plugging and structural rigidity.
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Mill Trunnion Liner
Protects the inner surface of the feed or discharge trunnion. Confirm the end, inside and outside diameters, length, taper, flange, hole pattern, rotation direction and adjacent structure.
Material Selection: Confirm Cr-Mo alloy steel, high-manganese steel, high-chromium cast iron or rubber-composite construction according to erosion, wear, corrosion and assembly method.
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Grinding Balls / Steel Balls
Grinding media subjected to repeated impact and wear. Confirm diameter distribution, ball consumption, mill size, speed, ore hardness, corrosion and breakage rate.
Material Selection: Confirm high-chromium cast balls, forged alloy-steel balls or other media systems validated for the duty according to impact, abrasion, corrosion and target particle size.
View Part Details →Check support and drive parts separately against the complete model, shell dimensions, journal, fits, gear parameters, material, heat treatment, lubrication and inspection requirements.
Trunnion Bearing / Bushing
Supports the mill trunnion and carries radial loads. Confirm journal diameter, bush inside and outside diameters, width, oil grooves, contact pattern, clearance, bearing housing and lubrication.
Material Selection: Confirm bearing bronze, Babbitt metal or the original sliding-bearing material according to bearing pressure, speed, temperature rise, lubrication and repair process.
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Girth Gear / Ring Gear
Meshes with the pinion to transmit the main drive. Confirm module, tooth count, pressure angle, helix angle, split joint, center distance, backlash and contact pattern.
Material Selection: Confirm cast steel or forged transmission alloy steel, heat treatment, machining accuracy, NDT and matched-pair inspection against the original design.
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Pinion
Meshes with the girth gear to transmit motor and gearbox output. Check module, tooth count, pressure angle, helix direction, shaft interfaces, backlash and contact pattern.
Material Selection: Confirm forged transmission-alloy steel and carburized or quenched-and-tempered heat treatment according to torque, tooth-surface hardness, core toughness and fatigue requirements.
View Part Details →MQ part numbers must be confirmed against the complete model, installation position and drawing revision. Numbers are not inferred on this page.
Selection Guidelines: Part numbers must match the model, shell dimensions and installation position. OEM drawing numbers and third-party part numbers are checked separately.
No. The grates, pulp lifters and end structures differ. First confirm the complete model, discharge type, shell dimensions, arrangement, drawing number and drawing revision.
No. Mills in the same nominal-diameter series may have different lengths, apertures, segments, rotation directions, lifters, supports and drives. Check the project drawings.
Submit the nameplate, shell diameter × length, general arrangement, photographs of the grates and lifters, liner arrangement and key dimensions to assess identification, reverse engineering and manufacturing requirements.
Provide the complete model, shell diameter × length, serial number, liner layout, drawings, used part photographs, materials and duty. We coordinate identification, material assessment, manufacturing selection, quality control and finished part delivery.
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