Mining filter presses run 24/7 with abrasive slurries containing silica, iron oxide, and other sharp minerals at 30-60% solids. The filter cloth in mining duty sees more abuse than any other industrial application. Here is what mining-grade cloth specifications look like, and how they differ from chemical or food grade.
What Makes Mining Cloth Different
Compared to chemical or food cloth, mining cloth is:
- Heavier — typically 500-800 g/m² vs 300-450 g/m² standard
- Stronger — tensile strength 3,500-5,500 N/5cm vs 1,500-2,500
- More abrasion-resistant — polyester or nylon face yarn over PP backing common
- Built for fast cake release — monofilament or calendered face essential to handle 6-10 cycles/day
- Designed for high-pressure cloth wash — survives 100-150 bar wash water without fiber damage
Concentrate vs Tailings Cloth — Different Specs
Concentrate cloth (copper, gold, iron ore concentrate) prioritizes retention efficiency — every microgram of fines in the filtrate is lost valuable concentrate. Typical spec: 5-15 µm equivalent retention, multifilament or laminate construction, calendered surface for cake release. Cloth life: 6-12 months.
Tailings cloth (the waste side) prioritizes flow rate and abrasion resistance — fines in filtrate go back to the process anyway. Typical spec: 20-50 µm retention, monofilament construction, often with heat-bonded edge for high-pressure resistance. Cloth life: 12-18 months.
For more on the mining filtration process, see automatic concentrate filter presses and mining tailings dewatering presses.
Common Mining Applications
- Copper concentrate — 25-30% Cu, fine particle, sticky cake
- Gold pyrite concentrate — very fine (under 38 µm), sometimes acidic
- Iron ore concentrate — magnetite or hematite, abrasive
- Lead-zinc concentrate — two separate concentrates, both dewatered
- Tailings (any base or precious metal mine) — high-volume, abrasive, fine
- Coal preparation fines — sticky, low specific gravity
- Bauxite residue / red mud — alkaline, very fine, hard to dewater
Specifications & Customization Options
- Materials: PP, polyester, polyester/PP laminate, nylon (high-abrasion)
- Weight: 500-800 g/m²
- Air permeability: 6-30 l/dm²/min @ 200 Pa
- Plate size: Most commonly 1500, 1800, 2000 mm
- Edge: Heat-bonded or rope edge for high pressure
- Lead time: 2-3 weeks for stock spec, 4-6 weeks custom
- Pack size: Mining operations typically order full-press sets (60-150 cloths)
FAQs
What’s typical cloth life in mining? Concentrate cloth: 4-8 months under abrasive conditions, 10-14 months in moderate duty. Tailings cloth: 12-18 months in normal duty, 6-9 months if particularly abrasive (silica-rich) or if cloth wash is missing or inadequate.
How important is cloth wash? Critical. Without an effective high-pressure cloth wash, mining cloth life drops to 2-4 months because mineral fines progressively blind the weave. A traversing high-pressure wash lance (100-150 bar) every 5-10 cycles extends cloth life by 2-3x.
Should I use polymer with mining cloth? Generally no for concentrate (it contaminates the saleable product) or tailings (it adds cost without value). Polymer flocculation is for sticky biological sludges, not mineral dewatering.
Need mining filter cloth? Send Senjie your mineral type, particle-size distribution (P80), abrasiveness, and press plate size — we’ll spec mining-grade cloth from our catalog.