Sujet: Maximiser le rendement & Minimizing Downtime in HighVolume Sand & Gravel Operations

1. OUVERTURE ENTRAÎNÉE PAR POINT DE DOULEUR

Every ton of sand and gravel you process carries a hidden cost. Are your current screening and washing systems struggling with inconsistent feed material, conduisant à 1520% fines loss in your washed sand? Is your plant experiencing 46 hours of unplanned downtime per week due to clogged screens or worn impeller blades in your sand washing equipment? Pour les directeurs d’usine et les entrepreneurs en ingénierie, the operational challenges are clear: hausse des coûts de l'énergie (souvent $0.08$0.12 par tonne traitée), strict environmental regulations on silt content (typiquement <3% for concrete sand), and the constant battle against equipment abrasion that reduces component life by 3040% in highsilica deposits.

Your current setup likely faces three specific bottlenecks: inefficient fines recovery (losing saleable product to settling ponds), consommation d'eau élevée (dépassement 1,500 gallons per ton of sand produced), and frequent mechanical failures in the dewatering phase. How can you increase your spec sand output by 15% while cutting water usage by 25%? The answer lies in a system designed for the specific abrasion and classification demands of China’s aggregate deposits.

2. APERÇU DU PRODUIT

Le HighEfficiency Sand Washing & Fines Recovery System (Modèle: SWR3000) est un modulaire, closedloop processing unit engineered specifically for sand and gravel mining operations processing 150300 tonnes par heure. This system integrates three core functions: lavage, classification, and dewatering into a single, compact footprint.

Flux de travail opérationnel:
1. Alimentation & Lavage: Runofmine sand (010mm) enters a dualshaft spiral classifier. Hightorque paddles break down clay balls and organic matter, achieving a 95% liberation rate of sand particles.
2. HydroCyclonic Classification: Boue (2025% solides) is pumped into a cluster of polyurethane hydrocyclones. This stage separates saleable sand (75600 micron) from ultrafine silt (<75 micron) with a cutpoint accuracy of ±5 microns.
3. Assèchement & Stockage: The classified sand slurry flows onto a highfrequency dewatering screen (0.5mm ouverture). The screen produces a dripfree sand product with a surface moisture content of 1215%, ready for immediate stockpiling or loading.

Champ d'application: Ideal for river sand, crushed sand (sable manufacturé), and natural gravel wash plants. Limites: Not designed for materials with >8% clay content without prescreening; requires a consistent feed rate of ±10% to maintain hydrocyclone efficiency.

3. CARACTÉRISTIQUES PRINCIPALES

AbrasionResistant Polyurethane Components | Base technique: Polyuréthane haute densité (Rive A 90) contre. standard rubber | Avantage opérationnel: Reduces wear part replacement frequency by 60% in highsilica sand (Dureté de Mohs 7) | Impact sur le retour sur investissement: Enregistre $12,000$18,000 annually in spare parts and labor for a 200 Usine TPH.

Entraînement à fréquence variable (VFD) on Main Pump | Base technique: 160kW motor with VFD controlling pump speed (8001450 RPM) | Avantage opérationnel: Allows operators to adjust cutpoint and recovery rate onthefly to match feed variations | Impact sur le retour sur investissement: Réduit la consommation d’énergie de 1822% compared to fixedspeed pumps, économie $0.015 per ton.

Integrated Silt Thickening Cone | Base technique: Gravity settling with a 45degree cone angle and underflow density control | Avantage opérationnel: Captures 90% d'eau de procédé pour une réutilisation immédiate, reducing fresh water intake | Impact sur le retour sur investissement: Cuts water consumption from 1,500 gal/ton to 400 gallon/tonne, lowering pumping and treatment costs.

QuickRelease Screen Panels | Base technique: Tensioned polyurethane panels with wedgelock system | Avantage opérationnel: Screen deck changeout time reduced from 4 heures pour 45 minutes | Impact sur le retour sur investissement: Increases plant availability by 34% par année, traduire en 1,500 additional tons of production.

DualFeed Inlet Design | Base technique: Two independent feed points with adjustable flow dividers | Avantage opérationnel: Ensures even distribution across the hydrocyclone cluster, preventing roping and blockages | Impact sur le retour sur investissement: Élimine 90% of cyclone blockages, reducing maintenance downtime.

Système de lubrification automatique | Base technique: Centralized grease pump with programmable intervals for all bearings and seals | Avantage opérationnel: Eliminates manual greasing errors and extends bearing life by 40% | Impact sur le retour sur investissement: Empêche les défaillances catastrophiques des roulements, économie $5,000 per repair event.

CorrosionResistant Steel Frame | Base technique: Hotdip galvanized steel (85micron coating) on all structural members | Avantage opérationnel: Withstands constant exposure to water and abrasive slurry without rust | Impact sur le retour sur investissement: Prolonge la durée de vie de l'équipement de 1015 years in coastal or highhumidity environments.

4. AVANTAGES CONCURRENTIELS

| Mesure de performances | Norme de l'industrie (Spiral Washer) | SWR3000 Solution | Avantage (% Amélioration) |
| : | : | : | : |
| Fines Recovery Rate | 7580% (lost to pond) | 9295% (recovered) | +1520% |
| Teneur en humidité du produit | 1822% | 1215% | 33% |
| Consommation d'eau | 1,2001,800 gallon/tonne | 350450 gallon/tonne | 70% |
| Durée de vie des pièces d'usure (Silica Sand) | 400600 heures | 1,2001,500 heures | +150% |
| Energy per Ton Produced | 1.82.2 kWh/tonne | 1.21.5 kWh/tonne | 30% |
| Temps de changement (Écran) | 4 heures | 45 minutes | 81% |

5. SPÉCIFICATIONS TECHNIQUES

• Modèle: SWR3000
• Capacité: 200300 TPH (dry sand basis)
• Taille de l'alimentation: 010 mm (maximum 15 mm)
• Exigences d'alimentation: 185 kW total (160 kW main pump + 25 kW screens & convoyeurs) @ 380V/50Hz/3Phase
• Spécifications matérielles: Polyuréthane (cyclones & écrans), Acier AR400 (spiral shafts), 316L acier inoxydable (water piping)
• Dimensions physiques: 18m (L) x 4,5 m (W) x 6.5m (H) – modular skid design
• Poids: 28,000 kilos (opérationnel)
• Plage de fonctionnement environnementale: 0°C to 45°C ambient; slurry temperature up to 60°C
• Besoin en eau: 350450 m³/hour at 34 bar inlet pressure

6. SCÉNARIOS D'APPLICATION

LargeScale River Sand Operation (Sichuan Province) | Défi: UN 500 TPH plant was losing 40 TPH of fine sand (<150 micron) to settling ponds due to inefficient spiral classifiers. Water usage was 1,600 gallon/tonne, exceeding local extraction permits. | Solution: Installed two SWR3000 units in parallel to process the 05mm fraction from the primary screen. | Résultats: Le recouvrement des amendes a été augmenté à 94%, ajout 35 TPH of saleable concrete sand. Water consumption dropped to 420 gallon/tonne. The client achieved a 14month ROI on the equipment cost.

Sable manufacturé (Crushed Granite) Usine (Guangdong Province) | Défi: The VSI crusher produced sand with high fines content (18% passage 75 micron), making it unsuitable for C30 concrete. Dewatering screens clogged every 2 heures. | Solution: The SWR3000 was configured with a 100micron hydrocyclone apex to remove excess fines. | Résultats: Fines content in final product reduced to 5%. Écran aveugle éliminé. The plant now produces 220 TPH of speccompliant manufactured sand, commanding a $2.50/ton premium.

Gravel Wash Plant Upgrade (Hebei Province) | Défi: Existing bucket wheel washers consumed 2,000 gal/ton and produced sand with 22% humidité, causing stockpile slumping and truck loading issues. | Solution: Replaced bucket wheel with SWR3000 system. | Résultats: Moisture content reduced to 13%. Stockpile stability improved. Water recycling allowed the plant to operate on a closedloop system, eliminating discharge fees.

7. CONSIDÉRATIONS COMMERCIALES

Niveaux de tarification des équipements (FOB Shanghai Port):

• Forfait standard (SWR3000S): $185,000 $210,000. Includes base unit, standard polyurethane wear parts, and manual lubrication.
• Forfait Premium (SWR3000P): $245,000 $275,000. Includes VFD on main pump, système de lubrification automatique, and 2year supply of wear parts.
• Forfait clé en main (SWR3000TK): $320,000 $360,000. Includes all above, plus feed conveyor, product conveyor, control panel with PLC, and onsite commissioning (5 jours).

Fonctionnalités facultatives:

• Système de surveillance à distance (SCADAready): +$12,000
• Additional hydrocyclone cluster for higher capacity: +$18,000
• Slurry density gauge for automated cutpoint control: +$8,500

Forfaits de services:

• Garantie de base: 12 mois sur les composants mécaniques, 6 months on wear parts.
• Extended Service Contract: $15,000/year includes 2 inspections de chantier, support technique prioritaire, et 10% remise sur les pièces détachées.
• Garantie de performance: Optional addon guaranteeing 90% fines recovery or contract penalty.

Options de financement:

• 30% acompte, 70% balance upon delivery.
• Options de location disponibles (3660 mois) via les institutions financières partenaires.
• Volume discounts for orders of 3+ unités (5% discount).

8. FAQ

Q: Can the SWR3000 handle feed material with high clay content (58%)?
UN: Oui, but we recommend a prescreening step (2mm ouverture) to remove large clay balls. The dualshaft spiral scrubber is effective at breaking down clay coatings, but excessive clay (>8%) can overload the hydrocyclone underflow.

Q: What is the typical payback period for this system?
UN: Basé sur les données de terrain de 12 installations, la période de récupération moyenne est 1418 mois. This is driven by water savings ($0.03/tonne), increased fines recovery (adding $0.50$1.00/ton in revenue), and reduced maintenance costs.

Q: How does the system perform with manufactured sand from a VSI crusher?
UN: It is highly effective. The hydrocyclone cluster can be tuned to remove excess fines (typiquement 1520% in VSI sand) jusqu'à 35%. This is a common application for clients upgrading their MSand quality.

Q: Quel est le délai de livraison?
UN: Le délai de livraison standard est 810 semaines à compter de la confirmation de la commande. Turnkey packages require 1214 weeks due to integration and testing. Livraison accélérée (6 semaines) est disponible moyennant un supplément 10% frais.

Q: Can the system be integrated with an existing plant control system?
UN: Oui. The standard PLC uses Modbus RTU protocol. We can integrate with AllenBradley, Siemens, or Schneider systems. The SCADAready option provides OPCUA connectivity.

Q: What is the warranty on the polyurethane wear parts?
UN: Polyurethane cyclones and screen panels carry a 6month warranty against manufacturing defects. Expected service life in typical sand (23% silice) is 1824 mois. In highsilica sand (>5%), attendre 1218 mois.

Q: Do you provide onsite training for operators?
UN: Oui. The Turnkey package includes 2 days of onsite training covering operation, entretien, et dépannage. Additional training days are available at $1,500/day plus travel expenses.