Onderwerp: Optimizing Material Sourcing: HighCapacity Screening Solutions for Lagos Quarry Operations

1. PYNPUNT GEDREWE OPENING

Lagos quarry operators face a specific set of logistical and operational pressures. The demand for highgrade granite and aggregates for commercial construction in Lekki, Epe, and Ikorodu continues to outpace supply, yet your margins are squeezed by three persistent challenges:

• Inkonsekwente voerkwaliteit: Runofmyne (ROM) material from local pits often contains high clay content and variable moisture levels (1525%), leading to blinding and pegging of conventional screens. This causes unscheduled downtime costing an estimated ₦850,000–₦1.2 million per hour in lost production.
• Fines Contamination: Inability to effectively remove minus5mm fines from your ¾inch and ½inch products results in rejected loads at the weighbridge, with rehandling costs adding ₦400–₦600 per ton to your operating expenses.
• Deurset-bottelnekke: Your current circuit struggles to maintain 250–300 tons per hour (TPH) during peak demand, forcing you to turn away contracts for the Eko Atlantic or Dangote refinery projects.

Is your current screening equipment engineered to handle the specific abrasiveness (Mohs hardheid 67) and highmoisture conditions of Lagos granite, or is it costing you contract penalties?

2. PRODUK OORSIG

Die HeavyDuty Inclined Vibrating Screen (Model LQS2460) is a primary classification unit designed specifically for the highthroughput, highwear environment of Lagos quarry sites. It processes ROM material after primary jaw crushing, delivering precise separation for concrete aggregate and asphalt base courses.

Operasionele werkvloei:
1. Voer: ROM materiaal (0300mm) is fed via conveyor onto the screen’s heavyduty feed box.
2. Stratifikasie: Material travels down the 6.0m x 1.5m deck at a 20° incline, driven by a dualshaft exciter generating 6.5 Gforce.
3. Primêre skeiding: Top deck (50mm opening) scalps oversize (+50mm) for recirculation to the secondary cone crusher.
4. Secondary Separation: Bottom deck (12mm or 19mm aperture) separates base course material from minus12mm fines.
5. Ontslag: Three product streams (oormaat, basiskursus, boetes) are directed to stockpile conveyors.

Toepassingsomvang: Suitable for dry and wet screening of granite, gneis, en kwartsiet. Beperkings: Not designed for sticky clay content exceeding 30% without a prewash system; maximum feed temperature 60°C.

3. KERNKENMERKE

HighTension DualShaft Exciter | Tegniese basis: Synchronized counterrotating shafts generate linear motion | Bedryfsvoordeel: Eliminates material pegging in 12mm apertures, even at 18% vog | ROI impak: Reduces screen blinding downtime by 70%, herstel 46 hours of production per week

AR400 Wear Liners | Tegniese basis: Skuurbestande staal (400 Brinell hardheid) on feed box and side plates | Bedryfsvoordeel: Extends service life in highimpact zones to 2,500 operating hours vs. 800 hours for standard mild steel | ROI impak: Verminder jaarlikse voeringvervangingskoste met 62% (saving approx. ₦3.8 million per unit per year)



Modulêre poliuretaandekstelsel | Tegniese basis: Injectionmolded polyurethane panels with 40% oop area | Bedryfsvoordeel: Reduces noise to 82 dB(A) and allows 15minute panel replacement without welding | ROI impak: Eliminates 8hour downtime for traditional wire cloth changes; increases uptime by 3.5%

Variable Angle Adjustment (15°25°) | Tegniese basis: Hydraulic jack system for deck angle modification | Bedryfsvoordeel: Optimizes material retention time for varying feed moisture levels | ROI impak: Improves screening efficiency from 85% aan 94% on wet days, reducing fines carryover by 50%

SelfCleaning Ball Decks | Tegniese basis: Rubber balls in pockets beneath the screen surface | Bedryfsvoordeel: Continuous impact on the underside of the mesh prevents clay buildup | ROI impak: Eliminates manual cleaning every 2 ure, spaar 3 operatorhours per shift

Geïntegreerde stofonderdrukking | Tegniese basis: Water spray nozzles at feed point and discharge chutes | Bedryfsvoordeel: Reduces respirable silica dust (PM10) to below 0.05 mg/m³ | ROI impak: Avoids NESREA fines of ₦5 million+ and protects operator respiratory health

HeavyDuty Coil Springs (4point suspension) | Tegniese basis: Chromiumsilicon alloy springs with 200mm static deflection | Bedryfsvoordeel: Isoleer 95% of vibration from the support structure | ROI impak: Extends structural steel life by 810 jare, eliminating foundation repair costs of ₦2.5 million

4. MEDEDINGENDE VOORDELE

| Prestasie-metriek | Bedryfstandaard (Conventional 2deck screen) | LQS2460 Solution | Voordeel (% verbetering) |
| : | : | : | : |
| Siftingsdoeltreffendheid (12mm opening, 15% vog) | 8285% | 9396% | +12% |
| Verblinding Frekwensie (per 8 uur skof) | 34 events | 0.5 events | 87% |
| Deurset (TPH, minus50mm feed) | 280 TPH | 380 TPH | +36% |
| Liner Replacement Interval | 800 ure | 2,500 ure | +212% |
| Geraasvlak by operateurstasie | 95 dB(A) | 82 dB(A) | 14% |
| Kragverbruik per ton gekeur | 0.45 kWh/ton | 0.31 kWh/ton | 31% |

Field data from 12month trial at a granite quarry in Ibadan (similar geology to Lagos).

5. TEGNIESE SPESIFIKASIES

| Parameter | Spesifikasie |
| : | : |
| Model | LQS2460 |
| Dekke | 2 (bo: 50mm, onderkant: 1225mm adjustable) |
| Skerm area | 9.0 m² per dek |
| Kapasiteit (Maks) | 450 TPH (droë voer, grootmaat digtheid 1.6 t/m³) |
| Vibrasie frekwensie | 8501050 RPM (adjustable via VFD) |
| Amplitude | 812 mm (beroerte) |
| Motor Krag | 2 x 18.5 kW (37 kW totaal), 415V, 50Hz, 3fase |
| Materiaalspesifikasies | Liggaam: IS 2062 Graad B; Voeringe: AR400; Skag: EN24T alloy steel |
| Fisiese afmetings (L x B x H) | 6,500 mm x 2,400 mm x 2,800 mm |
| Bedryfsgewig | 12,800 kg (without media) |
| Omgewingsreeks | Omgewing: 15°C tot 50 °C; Humiditeit: tot 98% nie-kondenserend |

6. TOEPASSINGSSCENARIO'S

Groot infrastruktuurprojek (LagosIbadan Railway) | Uitdaging: Contractor required ¾inch (19mm) aggregate with less than 3% fines content for concrete sleepers. Existing screen produced 68% boetes, causing load rejection. | Oplossing: Installed LQS2460 with 19mm polyurethane panels and ball decks. | Resultate: Fines content reduced to 2.1%. Load acceptance rate increased from 72% aan 99%. Project delivered 18,000 tons per month without penalty.

HighMoisture Season (MayOctober) | Uitdaging: Quarry near Ikorodu experienced 22% moisture in ROM during rainy season. Conventional screens blinded completely after 45 minutes of operation. | Oplossing: Deployed LQS2460 with variable angle set to 23° and water spray system. | Resultate: Continuous operation achieved for 10hour shifts. Screening efficiency maintained at 91%. Lost production recovered: 280 tons per shift.

Secondary Crushing Circuit Upgrade | Uitdaging: Plant manager needed to increase base course (019mm) output from 200 TPH aan 320 TPH without adding a new crusher. | Oplossing: Replaced existing 1.8m x 4.8m screen with LQS2460. | Resultate: Kring deurset verhoog na 340 TPH. Hersirkulerende las verminder van 45% aan 28%. Spesifieke energieverbruik het gedaal 0.14 kWh/ton.

7. KOMMERSIËLE OORWEGINGS

Toerustingprysvlakke (ExWorks, Lagos Port):

• Standaard konfigurasie (LQS2460S): ₦48.5 million – includes base unit, 2 sets of polyurethane panels, motor starter panel.
• Verbeterde konfigurasie (LQS2460E): ₦56.2 million – adds VFD for speed control, hydraulic angle adjustment, stof onderdrukking stelsel.
• Premium konfigurasie (LQS2460P): ₦64.8 million – includes all above plus spare exciter unit, 2 additional deck panel sets, remote monitoring module.

Opsionele kenmerke:

• Prewash spray bar system: ₦3.2 million
• Ceramiclined feed box: ₦1.8 million
• Outomatiese smeerstelsel: ₦950,000

Dienspakkette:

• Basies (Jaarliks): ₦2.4 million – includes 2 terrein inspeksies, vibration analysis report, telefoon ondersteuning.
• Omvattend (Jaarliks): ₦6.8 million – includes quarterly inspections, 48uur noodreaksie, all wear parts at 10% afslag.

Finansieringsopsies:

• 30% afbetaling, balanseer oor 12 maande by 18% belangstelling (Nigerian commercial bank rates).
• Huurdorp: 24month term at ₦3.1 million per month, with ₦1 buyout at end.
• Equipment tradein: Accepting used screens (enige handelsmerk) valued at market rate.

8. Gereelde vrae

V: Can the LQS2460 handle the high clay content typical of Lagos lateritic overburden?
A: Ja, for clay content up to 30%. The ball decks and variable angle feature prevent blinding. For clay exceeding 30%, we recommend the optional prewash system to slurry the fines before screening.

V: What is the typical lead time for delivery to a Lagos quarry site?
A: Standard units are available from our Apapa warehouse within 14 werksdae. Pasgemaakte konfigurasies (bv., special aperture sizes) vereis 68 weke vanaf bestellingbevestiging.

V: How does this screen compare to a banana screen for base course production?
A: Banana screens offer higher capacity per unit area but are less effective at removing fines in wet conditions. For Lagos applications where moisture varies, the LQS2460’s adjustable angle provides more consistent efficiency. Velddata wys 3% better fines removal in wet conditions.

V: What is the expected lifespan of the polyurethane deck panels?
A: With proper feed distribution (no impact from +200mm rocks), panels last 4,0006,000 bedryfsure. Panels are reversible, doubling life. Replacement cost per panel: ₦85,000.

V: Can this unit be integrated with an existing PLC system?
A: Ja. The VFD and vibration sensors are Modbus RTU compatible. We provide a standard RS485 interface. Custom integration with Siemens or AllenBradley systems is available as a service.

V: What training do you provide for plant operators?
A: We include a 2day onsite training program covering startup procedures, angle adjustment for moisture conditions, paneel vervanging, and daily vibration monitoring. Refresher training is available at ₦450,000 per session.

V: What is the warranty coverage?
A: 24 months on structural components (liggaam, exciter housing, vere). 12 months on moving parts (laers, skagte, motors). Excludes wear items (voerings, panele, gordels). Warranty covers parts replacement; labor is charged at ₦25,000 per hour for onsite work.