Closed-Circuit Ball Mill Restoration: Best Practices for RHA Processing Plants

Closed-Circuit Ball Mill Restoration Expert | RHA Plant Maintenance India - Tech India Engineers

Closed-Circuit Ball Mill Restoration & Maintenance Guide for RHA Plants

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Pre-Restoration Checklist for Industrial Ball Mills

What to Do:

  • Inspect Components Thoroughly:
    • Check for wear in liners, grinding media, and diaphragms
    • Examine the girth gear, pinion, and bearings for cracks or misalignment
  • Clean the System:
    • Remove residual RHA and debris using compressed air systems
    • Vacuum clean classifiers and conveyors to prevent contamination
  • Verify Lubrication Systems:
    • Replace old grease with ISO VG 320 oil for gear lubrication
    • Test automatic lubrication system functionality

What NOT to Do:

  • ❌ Avoid Skipping Inspections: Minor gear cracks can lead to catastrophic failure
  • ❌ Don't Use Incorrect Lubricants: Non-food-grade grease degrades RHA quality
  • ❌ Never Bypass Safety Protocols: Always implement lock out/tag out procedures

Post-Restoration: Girth Gear Alignment Process

  1. Radial Runout Measurement: Use dial indicators (tolerance ≤0.2 mm/m)
  2. Pinion Adjustment: Maintain 1.5-2 mm backlash between pinion and gear
  3. Thermal Compensation: Conduct alignment at 60-70°C operating temperature
Expert Tip: Apply lithium-based high-pressure grease during startup

Common Alignment Mistakes:

  • Over-tightening gear bolts causing distortion
  • Ignoring thermal expansion during measurements

Auxiliary Equipment Maintenance Guide

1. Classifiers

  • Do: Weekly rotor blade cleaning for 45-100 micron particle size
  • Don't: Operate with imbalanced rotors (reduces efficiency by 40%)

2. Screw Conveyors

  • Do: Monthly trough inspections with UHMW-PE liners
  • Don't: Exceed 85% load capacity to prevent motor failure

3. Bucket Elevators

  • Do: Bi-weekly belt tension checks (recommended 1-2% elongation)
  • Don't: Ignore spillage indicating incorrect bucket spacing

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