Subject: Limestone Mining Producers Inspection – Precision Screening for Consistent Product Quality

1. PAINPOINT DRIVEN OPENING

Every ton of limestone that fails specification represents lost revenue, rehandling costs, and potential contract penalties. For mining producers, the operational challenges are consistent and costly:

• Oversized contamination: Uncrushed material entering the product stream causes crusher blockages downstream, costing an average of $2,500 per hour in unscheduled downtime.
• Fines carryover: Excessive dust and fine particles (below 6mm) in road base or agricultural lime reduce market value by 1520% per ton.
• Blinding and pegging: Moist limestone (612% surface moisture) clogs woven wire screens, reducing effective screening area by 40% and forcing operators to run conveyors at reduced speeds.
• Wearrelated quality drift: As screen media wears, aperture size increases, allowing offspec material to pass—leading to customer rejections and rescreening costs.

Is your current inspection process catching these issues before product leaves the plant? Are you relying on manual sampling that misses the variability across a 500ton stockpile?

2. PRODUCT OVERVIEW

Equipment Type: HighFrequency Vibratory Screen with Modular Polyurethane Media – designed specifically for limestone mining producers inspection of crushed and screened aggregates.

Operational Workflow:
1. Feed Distribution: Material enters via a flared feed box to ensure even distribution across the full screen width (reduces localized wear and bypass).
2. Primary Stratification: HighGforce vibration (4.55.5 G) separates fines from coarse material within the first 1/3 of the deck.
3. Inspection Screening: Material passes over a 3deck configuration with progressively smaller apertures (25mm, 12mm, 6mm) for precise size classification.
4. Oversize Reject: Material retained on the top deck is diverted to a crusher return conveyor.
5. Product Collection: Three separate discharge chutes collect sized fractions (coarse, medium, fines) for direct loading or stockpiling.

Application Scope: Ideal for dry or moderately moist limestone (up to 8% moisture), primary and secondary screening after jaw or impact crushing. Limitations: Not suitable for sticky claybound limestone (>12% moisture) without predrying or heated deck options.

3. CORE FEATURES

Modular Polyurethane Screen Panels | Technical Basis: Injectionmolded polyurethane with 65 Shore A hardness provides 3x longer wear life than woven wire | Operational Benefit: Eliminates aperture enlargement over 8,000 operating hours, maintaining consistent product specification | ROI Impact: Reduces screen media replacement costs by 60% and eliminates rescreening labor

HighGForce Exciter System | Technical Basis: Twinshaft exciter generating 4.55.5 G at 1,200 RPM, with adjustable amplitude (26mm) | Operational Benefit: Breaks surface tension of moist fines, reducing blinding by 70% compared to conventional screens | ROI Impact: Increases effective screening area by 35%, allowing 15% higher throughput without deck expansion

QuickChange Deck Tensioning | Technical Basis: Hydraulic tensioning rails with 4point locking mechanism | Operational Benefit: Complete screen media change in 45 minutes versus 4 hours for bolted systems | ROI Impact: Reduces planned maintenance downtime by 85%, adding 3.5 hours of production per change

Integrated Dust Suppression Spray System | Technical Basis: Lowpressure (2 bar) water spray bars with adjustable nozzles positioned at feed point and discharge | Operational Benefit: Reduces airborne respirable dust by 90% at transfer points, meeting MSHA compliance | ROI Impact: Eliminates $12,000/year in dust suppression chemical costs and avoids potential fines

RealTime Vibration Monitoring | Technical Basis: Accelerometers on exciter bearing housings transmitting data to PLC via 420mA loop | Operational Benefit: Alerts operators to bearing degradation 200 hours before failure, preventing catastrophic damage | ROI Impact: Reduces unplanned downtime by 92% and extends exciter service life by 40%



Adjustable Deck Angle (1525 degrees) | Technical Basis: Hydraulic jack system with lockable pivot points | Operational Benefit: Optimizes material travel speed for varying moisture levels—steeper angle for wet material, shallower for dry | ROI Impact: Maintains consistent screening efficiency across seasonal moisture changes, reducing product variability by 18%

SelfCleaning Ball Deck Assembly | Technical Basis: Rubber balls (25mm diameter) in pockets beneath screen panels, activated by vibration | Operational Benefit: Continuously dislodges nearsize particles from apertures, preventing pegging | ROI Impact: Eliminates manual cleaning labor (2 hours per shift) and maintains 95% open area utilization

4. COMPETITIVE ADVANTAGES

| Performance Metric | Industry Standard (Woven Wire) | Limestone Mining Producers Inspection Solution | Advantage (% improvement) |
| : | : | : | : |
| Screening Efficiency (6mm cut) | 82% | 96% | +17% |
| Media Wear Life (hours) | 2,500 | 8,000 | +220% |
| Changeout Time (hours) | 4.0 | 0.75 | 81% |
| Blinding Rate (8% moisture) | 35% | 10% | 71% |
| Product Consistency (std dev, mm) | ±1.8 | ±0.6 | 67% |
| Dust Emissions (mg/m³) | 12 | 1.2 | 90% |
| Annual Maintenance Cost ($) | $18,500 | $6,200 | 66% |

Field data from 12month trial at Midwest Limestone Quarry, Indiana (2023).

5. TECHNICAL SPECIFICATIONS

| Parameter | Specification |
| : | : |
| Model | LMP2460 (Limestone Mining Producers) |
| Screen Area | 14.4 m² (3 decks x 2.4m x 6.0m) |
| Capacity Rating | 350450 tph (based on 100mm feed top size, 1.6 t/m³ bulk density) |
| Power Requirements | 30 kW (2 x 15 kW exciter motors, 460V, 3phase, 60 Hz) |
| Vibration Frequency | 1,200 RPM (fixed) |
| Amplitude Range | 26 mm (adjustable via eccentric weights) |
| Deck Angle | 1525 degrees (hydraulically adjustable) |
| Screen Media | Polyurethane modular panels, 25mm / 12mm / 6mm apertures |
| Material Specifications | Frame: ASTM A36 steel, 12mm plate; Exciter housing: ductile iron; Bearings: SKF 22320 spherical roller |
| Physical Dimensions | 7.2m L x 3.0m W x 3.8m H (operating) |
| Weight | 12,500 kg (without media) |
| Environmental Operating Range | 20°C to 50°C; suitable for outdoor installation with weather cover option |

6. APPLICATION SCENARIOS

LargeScale Quarry (1,200 tph Plant) | Challenge: Producer needed to reduce fines carryover in 57 stone (25mm12mm) from 8% to below 3% to meet DOT specifications for highway base course. Manual inspection showed variability across shifts. | Solution: Installed LMP2460 as final inspection screen after secondary impact crusher, with 12mm polyurethane panels and ball deck assembly. | Results: Fines carryover reduced to 2.1% (measured weekly over 6 months). Customer rejections dropped from 4 per month to zero. Annual savings of $180,000 in rescreening and disposal costs.

Agricultural Lime Producer (200 tph) | Challenge: High moisture (79%) in stockpiled limestone caused 40% blinding on existing woven wire screens, forcing 30% production rate reduction. | Solution: Replaced existing screen with LMP2460 configured with 6mm polyurethane panels and 20degree deck angle. | Results: Blinding reduced to 8%. Production rate increased from 140 tph to 195 tph. Payback period: 14 months based on additional 55 tph throughput.

Cement Plant Raw Mill Feed (500 tph) | Challenge: Oversized material (>25mm) entering raw mill caused 12% reduction in grinding efficiency and increased wear on roller mill tires. | Solution: Installed LMP2460 as prescreening unit with 25mm top deck and 12mm middle deck, feeding directly to mill. | Results: Oversized contamination eliminated. Mill throughput increased by 9%. Roller tire replacement interval extended from 8,000 to 11,000 hours.

7. COMMERCIAL CONSIDERATIONS

Equipment Pricing Tiers:

• Base Model (LMP2460B): $185,000 – Standard frame, polyurethane media, manual deck angle adjustment
• Enhanced Model (LMP2460E): $215,000 – Includes hydraulic deck adjustment, vibration monitoring system, dust suppression
• Premium Model (LMP2460P): $248,000 – All enhanced features plus heated deck option for highmoisture applications, remote monitoring interface

Optional Features:

• Weather enclosure (full canopy): $18,500
• Stainless steel spray bars (corrosion resistance): $4,200
• Additional screen media sets (polyurethane, 3 sizes): $12,000/set
• Spare exciter assembly: $22,000

Service Packages:

• Standard Warranty: 24 months on frame, 12 months on exciter bearings
• Extended Warranty: 60 months on frame, 36 months on exciter (add 8% to purchase price)
• Preventive Maintenance Contract: $4,800/year – Includes quarterly inspection, vibration analysis report, bearing lubrication
• OnSite Commissioning: $3,500 (2 days, includes operator training)

Financing Options:

• Net 30 terms for qualified buyers
• Leasetoown: 48month term at 4.9% APR (subject to credit approval)
• 10% deposit, balance upon delivery

8. FAQ

Q: Can the LMP2460 handle limestone with 10% moisture without blinding?
A: At 10% moisture, expect 1520% blinding on the 6mm deck. The ball deck assembly and adjustable angle (set to 2225 degrees) mitigate this. For consistent performance above 8% moisture, we recommend the heated deck option.

Q: What is the expected lifespan of the polyurethane screen panels in limestone applications?
A: Field data shows 7,5008,500 hours for 12mm and 25mm panels, and 5,0006,000 hours for 6mm panels. This is 3x longer than woven wire under identical conditions.

Q: How does the vibration monitoring system integrate with existing plant PLCs?
A: The system outputs a 420mA signal for bearing vibration (mm/s RMS) and temperature (°C). It is compatible with AllenBradley, Siemens, and Modbus RTU protocols. No additional gateway required.

Q: What is the lead time for delivery?
A: Standard lead time is 1214 weeks from order confirmation. Expedited delivery (8 weeks) is available at a 10% surcharge.

Q: Can the screen be retrofitted into an existing structure?
A: Yes. The LMP2460 footprint (7.2m x 3.0m) matches standard 8' x 20' screen layouts. We provide mounting adapters for most common support frames. Site survey required for custom installations.

Q: What training is provided for maintenance crews?
A: Onsite commissioning includes 4 hours of handson training covering media changeout, exciter bearing replacement, and vibration monitoring calibration. Additional training sessions available at $1,200/day.

Q: Is financing available for international buyers?
A: Yes, through our export credit partner. Terms vary by country. Minimum 30% down payment required for shipments outside North America.