Ball Mill Grate Liner High Manganese Steel Grate Plate for Grate Discharge Ball Mill

Product Introduction

Our ball mill grate liner (grate plate) is installed on the discharge end of grate-type ball mills. The perforated grate allows qualified fine slurry or powder to pass through, while retaining grinding media and coarse ore inside the mill for further grinding. It controls material retention time, avoids over-grinding and increases mill throughput.

Application Scenarios

1. Metal Mining & Mineral Processing (Core Market) For primary coarse grinding circuits of copper, iron, gold, molybdenum and lead-zinc concentrators. The grate plate discharges qualified slurry rapidly while trapping steel balls and coarse ore inside the mill for continuous impact crushing. It delivers higher throughput than overflow ball mills, widely adopted in large mining projects in Chile and Peru.
2. Aggregate & Quarrying Pre-grinding of hard rock such as granite, basalt, limestone and river stone. It screens out qualified particles and sends coarse material back for regrinding, maintaining stable product size for high-capacity stone lines.
3. Cement & Building Materials For cement raw mills, clinker mills and slag grinding systems. Designed for 24-hour continuous heavy-duty operation, resisting persistent particle erosion, stabilizing fineness and reducing downtime caused by blockage.
4. Metallurgy & Slag Recycling Regrinding of steel slag, iron slag and mine tailings. The wear-resistant grate liner withstands strong particle abrasion for solid waste resource recovery.
5. Non-metallic Minerals & Chemical Industry Grinding of quartz sand, feldspar, phosphate ore, kaolin and gypsum. Prevents over-grinding and precisely controls particle size to meet flotation and purification requirements.

Working Conditions

• Primary coarse grinding requiring high throughput
• Wet slurry grinding and dry powder grinding
• Strict control of product fineness, avoid over-grinding
• 24/7 continuous high-load production
• Replacement spare parts for discharge end of grate ball mill

Inspection Procedure

1. Raw Material Inspection Check chemical composition of molten steel by spectrometer. Verify alloy elements content to meet casting standard. Reject unqualified raw material before pouring.
2. Casting Visual Inspection Visual check for surface defects: sand hole, shrinkage, crack, slag inclusion. Clean casting riser and burrs. Mark defective pieces for rework or scrap.
3. Heat Treatment Inspection Monitor heat treatment temperature & holding time. Random sampling for hardness test (Brinell / HRC) to guarantee mechanical performance.
   
4. Dimension & Weight Inspection Measure overall size, thickness, bolt hole position and diameter. Compare with customer drawing. Check single piece weight, record deviation.
   
5. Non-Destructive Testing (NDT)

• MT Magnetic Particle Testing: Detect surface & near-surface cracks
  
• UT Ultrasonic Testing: Check internal shrinkage, porosity and inclusions NDT reports can be issued upon client request.
  

6.Final Sampling Inspection Random recheck of appearance, dimension and hardness. Compile full inspection documents including chemical report, hardness record and NDT certificate.

7.Packing Inspection Check seaworthy packing, mark part number, quantity and shipping mark before loading.

Price & Quotation

Ball mill grate liner is custom casting. Final price depends on material grade, drawing dimension, total order weight, NDT requirements and trade terms.

• Unit of Price: USD per Metric Ton
• Trade Term: FOB Qingdao / CFR / CIF
• MOQ: 1 Metric Ton
• Lead Time: 20–100 working days after deposit and drawing confirmation
• Factors affecting quotation:
  • Material grade (Mn13 / Mn13Cr2 / Mn18Cr2 / high chrome / alloy cast steel)
  • Plate structure, grate hole arrangement, bolt hole layout and casting complexity
  • Total order weight, better unit price for bulk purchase
  • Extra inspection: MT, UT, SGS/BV third-party inspection
  • Packing option: steel frame or wooden case

Please send your drawing, ball mill model and purchasing weight for formal quotation with complete MTC inspection documents.

Quotation valid for 30 days; raw material price fluctuation will affect final contract price.

Inquiry Tip: Send grate liner drawing, grate ball mill model and purchase tonnage to get FOB Qingdao quotation together with full inspection certificates.