High-capacity cartridges — longer life, lower maintenance, engineered for mining dust.

Key Selling Points at a Glance

· 50%–120% Higher Dust Holding Capacity — 1400–2200g/m² versus 750–1100g/m² for standard 

cartridges

· Extended Replacement Cycle by 1–3 Times — Reduces unplanned downtime and maintenance 

costs

· Gradient Density Composite Media + PTFE Membrane — Layered dust interception with 

90%+ recovery after each pulse cleaning

· Wide-Shallow Bridge-Proof Pleat Design — Eliminates dust bridging and maximizes usable 

storage space

· Engineered for Abrasive Mine Dust — Withstands high quartz content, wide particle

 distribution (1–80μm), and easy compaction characteristics

I. Operating Condition Overview & Core Significance of Dust Holding Capacity

Mine crushing stations — including jaw crushers, cone crushers, impact crushers, and vibrating 

screening equipment — generate ultra-high concentration mineral dust ranging from 

1000 mg/m³ to 3500 mg/m³. The dust stream consists of mixed hard, sharp coarse rock fragments, 

submicron silicate fine powder, and agglomerated dry mineral particles.

Compared with ordinary industrial dust, mine dust exhibits three distinctive properties:

· High abrasion hardness — accelerates media wear

· Wide particle size distribution — spans 1–80μm

· Easy compaction — forms dense dust cakes under airflow impact

Dust holding capacity (DHC) refers to the maximum mass of test dust that a filter cartridge can 

stably capture before reaching the set final differential pressure threshold, quantified in g/m² of 

effective filter media area. This parameter directly determines maintenance intervals, equipment 

downtime frequency, and overall operating costs of mine dust removal systems.

Low-capacity ordinary filter cartridges reach the 600–800Pa replacement differential pressure 

within only 7–15 working days, requiring frequent shutdowns and severely affecting continuous

production. High-capacity mine-specialized pleated cartridges — featuring gradient density 

composite media, optimized wide-shallow pleat layouts, and reinforced support

structures — boost unit-area dust holding capacity by 50%–120% versus standard general-purpose 

cartridges, perfectly matching long-hour heavy-load crushing conditions.

This document systematically defines standardized DHC test indicators, analyzes 

multi-dimensional influencing factors (media structure, pleat geometry, filtration wind speed, 

pulse cleaning parameters), grades capacity matching schemes for different mine dust loads, 

provides operation optimization rules, and includes a concise FAQ for mine environmental 

protection technicians and equipment procurement supervisors.

II. Standard Definition & Laboratory Test Calibration Parameters

Official Quantitative Definition & Calculation Formula

Dust holding capacity (DHC) is the total mass of standardized ISO A3 mineral test dust retained 

on filter media when the filter's differential pressure rises to the industry-specified final limit of 

800 Pa under fixed rated airflow, calculated as:

DHC (g/m²) = Total captured dust mass (g) ÷ Total effective filtration area of cartridge (m²)

Two core evaluation dimensions for mine filter cartridges:

· Unit-area static DHC — Laboratory bench test index under constant airflow, reflecting inherent 

media dust storage potential. Mainstream mine high-capacity cartridges reach 1400–2200 g/m²,

 while ordinary non-gradient polyester cartridges only achieve 750–1100 g/m².

· Actual effective field DHC — Real dust storage amount under on-site high-concentration mineral 

dust and periodic pulse cleaning, typically 65%–80% of static laboratory value, affected by wind

 speed, cleaning cycle, and dust abrasion characteristics.

Unified Mine Filter Cartridge Test Bench Standard Conditions

To ensure comparable data, all laboratory testing follows fixed calibration parameters aligned 

with mine crushing conditions:

· Test dust: ISO A3 silica-rich mineral mixed dust (simulating granite, iron ore, limestone crushing 

dust with high quartz content)

· Constant surface wind speed: 0.5 m/min (medium-load mine standard)

· Final differential pressure cutoff threshold: 800 Pa (mandatory replacement limit)

· Pulse cleaning interval (cyclic capacity test): 8 minutes, blowing pressure 0.5 MPa, single pulse 

duration 0.2s

· Ambient test conditions: 25°C, relative humidity 45% (dry mine standard, eliminating 

condensation interference)

DHC Grade Classification for Mine Working Conditions

Classified by static unit-area dust storage index to match different crushing dust concentration 

loads:

· Light load low-concentration grade (1400–1600 g/m²) — Suitable for closed small crushing 

lines with dust concentration below 1200 mg/m³, limestone soft ore processing, single small jaw 

crusher

· Medium load universal mine grade (1600–1900 g/m²) — Mainstream matching for medium-sized

 multi-stage crushing stations, dust concentration 1200–2200 mg/m³, iron ore and basalt

 medium-hard rock crushing

· Heavy load ultra-high concentration grade (1900–2200 g/m²) — Customized gradient composite 

media, dedicated to open-pit large-scale crushing & screening lines, dust concentration 2200–3500

 mg/m³, quartz-rich hard granite with highly abrasive dust

III. Core Structural & Media Parameters Determining DHC

Gradient Density Composite Filter Media — Primary Factor Boosting Dust Storage Volume

Single-layer homogeneous polyester media has loose surface fibers, allowing fine mineral dust to

 embed deep into substrate pores and rapidly saturate storage space. Mine high-capacity cartridges

 adopt three-layer gradient density pleated media, realizing layered dust interception to maximize 

effective dust storage:

· Outer loose coarse fiber layer (400 g/m²) — Captures large rock fragments and coarse dust above

 20μm, forms loose primary dust cake to prevent hard particles from scratching inner layers,

 occupies shallow pleat storage space

· Middle transition fiber buffer layer (250 g/m²) — Uniformly distributes airflow, prevents local

 dust overloading, reserves intermediate storage space for medium-size mineral particles

· Inner dense fine capture layer (300 g/m²) — Intercepts submicron silicate fine dust below 5μm, 

blocks deep penetration into fiber substrate, keeps internal pore structure unobstructed for

 long-term dust accumulation

Auxiliary media surface treatment parameters affecting capacity:

· PTFE microporous membrane coating — Surface filtration mode restricts all dust to the outer 

membrane surface; dust cake does not penetrate fiber interior; effective DHC increases by 40%

 compared with uncoated media

· Calendered surface finishing — Smooth flat surface reduces dust adhesion force; pulse cleaning 

thoroughly strips accumulated dust and recovers 90%+ of original dust storage space after each

 blowing cycle

· Anti-abrasion thickened substrate (total gram weight ≥600 g/m²) — Resists long-term scouring 

of sharp quartz dust, avoids media perforation failure before reaching rated DHC

Pleat Geometric Structural Design — Key to Expanding Physical Dust Storage Space

Narrow dense deep pleats easily cause dust bridging between folds under high-concentration

 mine dust, drastically reducing actual usable DHC. Mine dedicated high-capacity cartridges 

wide-shallow optimized pleat geometry with standardized dimensional indicators:

· Pleat spacing: ≥8mm per fold, 22–28 pleats per meter of cartridge height; narrow pleats below 

6mm rapidly form dust bridges after short operation, cutting effective capacity by over 50%

· Pleat depth: 30–38mm shallow design; deep pleats over 45mm trap compacted mineral dust at 

fold bottoms that cannot be stripped by pulse airflow, permanently occupying storage volume

· Pleat vertex angle: 50°–60° obtuse angle layout, eliminating right-angle dead zones where hard 

mine dust accumulates irreversibly; acute-angle pleats below 40° generate permanent dust

 agglomeration dead spaces

· Single cartridge sizing rule: Large-diameter long cartridges (φ325×900mm, φ350×1000mm) 

obtain 12–18m² effective filtration area per piece, multiplying total system DHC without expanding

 dust collector cabinet volume

IV. On-Site Coupling Parameters Affecting Actual Effective DHC

Even cartridges with identical laboratory static DHC show large field capacity differences under

 varying mine crushing operating parameters. Four core coupling factors must be strictly

 controlled to retain rated dust storage performance.

Surface Filtration Wind Speed Restriction Standard

Excessively high wind speed compacts hard mineral dust tightly onto the filter media surface, 

forming impermeable dense dust cakes that cannot be fully cleaned, drastically lowering

 recoverable effective DHC.

Graded safe wind speed limits matched to mine dust concentration:

· Low-concentration closed crushing (<1200 mg/m³): 0.5–0.6 m/min, static capacity utilization

 rate 75%–80%

· Medium-load multi-stage crushing (1200–2200 mg/m³): 0.4–0.5 m/min, capacity utilization rate

 70%–75%

· Open-pit ultra-high concentration crushing (>2200 mg/m³): ≤0.35 m/min, reserve 30% air 

volume design margin, capacity utilization rate maintained above 65%

⚠️ If wind speed exceeds 0.6 m/min for high-concentration mine dust, actual effective DHC

 drops by more than 40%, and differential pressure surges to replacement threshold within 

half the standard service cycle.

Pulse Jet Cleaning Parameter Matching Rules

Improper pulse blowing pressure, cycle, and duration lead to incomplete dust cake stripping or

 media surface membrane damage, both reducing long-term effective DHC:

· Blowing pressure grading for mine hard dust: Standard 0.50–0.60 MPa. Pressure below 0.45 

MPa cannot peel compacted mineral dust — residual dust permanently occupies storage space. 

Pressure above 0.65 MPa scratches the PTFE membrane and exposes absorbent substrate fibers, 

accelerating dust embedding.

· Cleaning cycle setting logic (frequent light blowing preferred):

  · Low-concentration limestone crushing: 10–15 min pulse interval

  · Medium-hard iron ore multi-stage crushing: 6–9 min interval

  · Quartz granite ultra-high concentration crushing: 3–5 min short cycle to prevent dust cake 

compaction

  · Single pulse duration unified standard: 0.20–0.25s — overlong blowing generates excessive 

airflow impact compressing dust deeper into pleat gaps

Dust Physical Property Influencing Factors

· Dust hardness & particle size — High-quartz sharp ore dust scratches the filter media surface 

membrane over long operation, gradually reducing recoverable DHC by 20%–35% within the full

 service cycle; soft limestone fine dust has low abrasion, capacity attenuation below 15%

· Dust moisture content — Mine dust with moisture above 6% forms sticky mud-like

 agglomerates 

after deposition, cannot be fully stripped by pulse cleaning; permanent dust residue reduces 

effective storage volume; dry crushing lines with moisture <3% maintain maximum rated DHC

· Dust bulk density — Heavy mineral dust (iron ore, magnetite) forms thin compact dust cakes

 with smaller occupied volume; unit-area effective DHC is 20% higher than lightweight silicate 

rock dust under identical differential pressure limit

V. Stepwise Matching Rules for Different Mine Crushing Conditions

Step 1 — Measure on-site dust concentration, ore hardness, and dust moisture content to confirm 

load grade

Step 2 — Select filter cartridge static DHC grade corresponding to the load:

· Small closed single jaw crusher, limestone soft ore, dust <1200 mg/m³: 1400–1600 g/m² 

light-load high-capacity coated cartridge, wind speed 0.5–0.6 m/min, pulse cycle 10–15 min

· Medium multi-stage crushing line, iron ore/basalt medium-hard rock, dust 1200–2200

 mg/m³: 1600–1900 g/m² universal gradient composite cartridge, wind speed 0.4–0.5 m/min, 

pulse cycle 6–9 min

· Open-pit large crushing & screening system, quartz granite high-hard rock, dust >2200 

mg/m³: 1900–2200 g/m² heavy-duty ultra-high capacity wide-shallow pleat cartridge, 

wind speed ≤0.35 m/min, front coarse dust baffle mandatory, pulse cycle 3–5 min

Step 3 — Calculate total required filtration area based on system air volume and safe wind speed; 

select large-diameter long cartridges to maximize single-piece DHC

Step 4 — Optimize pulse cleaning parameters and install front pre-separation equipment to lift

 actual effective DHC utilization rate above 65%

VI. Daily Operation Maintenance Specifications

· Shift differential pressure monitoring — Record pressure difference per shift; if differential 

pressure rises over 100 Pa within one shift, it indicates dust cake compaction and incomplete 

cleaning — shorten pulse cycle immediately to recover usable dust storage space

· Daily front baffle inspection — Clean accumulated large rock fragments on the labyrinth 

pre-separation plate to avoid oversized particles directly entering filter cartridge pleats and 

occupying dust holding volume

· Weekly compressed air source inspection — Drain oil-water separator residual water 

and oil; 

oil-containing pulse airflow forms sticky dust mud on media surface, permanently reducing 

effective DHC

Prohibited maintenance operations damaging long-term DHC performance:

· ❌ High-pressure external air gun flushing of disassembled cartridges — scratches PTFE

 surface membrane, allows fine dust to embed substrate and permanently lose recoverable

 storage space

· ❌ Water washing or chemical cleaning — mineral dust mixed with water solidifies into hard

 blocks inside pleats, completely invalidating DHC after a single wash

· ❌ Irregular long-interval centralized high-pressure blowing — long-time dust compaction

 forms irreversible thick dust cakes that cannot be stripped by subsequent pulse cycles

✅ Lightly blocked cartridges: allow maximum 2 times low-pressure (0.2 MPa) internal reverse

 blowing emergency cleaning. Repeated cleaning will wear surface coating and reduce DHC by 

over 30%, requiring full replacement.

VII. Common Capacity Mismatch Fault Analysis & Troubleshooting

Fault 1 — New filter cartridge reaches 800 Pa replacement differential pressure within 10 working 

days, far shorter than rated service cycle

Root Causes:

· Selected low DHC ordinary polyester cartridge without gradient media

· Surface wind speed exceeds 0.6 m/min safe limit

· Missing front coarse dust pre-separation baffle

Solutions:

· Upgrade to 1600 g/m²+ gradient composite high-capacity cartridges

· Add extra cartridges to expand total filtration area and reduce wind speed to standard safe 

range

· Install labyrinth dust baffle at air inlet to intercept large rock fragments

Fault 2 — Laboratory static DHC reaches 1800 g/m², but field actual effective capacity is only 

900 g/m²

Root Causes:

· Pulse cleaning pressure too low (<0.45 MPa) or cycle too long (>10 min) — mineral dust cake 

compacted on media surface

· Compressed air contains oil and water causing sticky dust adhesion

· Narrow deep pleat structure selected with severe dust bridging between folds

Solutions:

· Adjust pulse blowing pressure to 0.5–0.6 MPa; shorten cleaning cycle to 3–8 min according to

 dust concentration

· Install cold dryer and double-stage oil-water separator to purify air source

· Replace with wide-shallow optimized pleat mine-specialized filter cartridges

VIII. Conclusion

Dust holding capacity is the core comprehensive performance index determining the service 

cycle and maintenance cost of filter cartridges for mine crushing high-concentration dust 

conditions. It is divided into laboratory static inherent capacity and on-site actual effective 

capacity — the latter affected by multiple operating coupling parameters.

The three-layer gradient density composite PTFE-coated filter media and wide-shallow

 optimized pleat geometric structure are the two fundamental designs boosting unit-area

dust storage volume of mine-specialized cartridges, achieving static capacity of 

1400–2200 g/m² — 50%–120% higher than general industrial filter cartridges.

Scientific matching of DHC grade according to mine dust concentration, ore hardness, 

and moisture — combined with strict control of surface filtration wind speed below 0.6 m/min, 

optimized pulse cleaning parameters, and front-end coarse dust pre-separation — can maximize

effective DHC utilization rate above 65%, extend filter cartridge replacement cycles by 1–3 times,

 reduce unplanned production shutdown frequency caused by dust collector maintenance,

 and significantly cut long-term comprehensive operation and maintenance expenditure of 

crushing station dust removal systems.

IX. Concise FAQ

Q1: Why do gradient composite media mine filter cartridges have much higher DHC than

 single-layer ordinary polyester cartridges?

A1: Three-layer gradient fiber realizes layered interception of coarse and fine mineral dust. 

All dust accumulates on the outer PTFE membrane surface without deep embedding into

 substrate pores, fully utilizing pleat internal storage space. Single-layer homogeneous fiber

 allows fine dust to penetrate interior and rapidly saturate storage volume.

Q2: What static DHC grade cartridge must be selected for an open-pit quartz granite ultra-high

 concentration crushing line?

A2: Heavy-duty grade with static DHC 1900–2200 g/m² — wide-shallow pleat gradient PTFE

 composite cartridge, wind speed strictly controlled ≤0.35 m/min, equipped with front labyrinth 

coarse dust baffle.

Q3: Can blocked mine high-capacity filter cartridges be washed to restore original DHC?

A3: Strictly prohibited. Mineral dust mixed with water solidifies into irreversible hard blocks 

inside pleats, permanently occupying dust storage space. Only maximum 2 times low-pressure 

internal reverse blowing emergency cleaning is permitted, with obvious capacity attenuation

 after repeated cleaning.