Subject: Maximizing Yield & Minimizing Downtime in HighVolume Sand & Gravel Operations

1. PEMBUKAAN PAINPOINT DRIVEN

Every ton of sand and gravel you process carries a hidden cost. Are your current screening and washing systems struggling with inconsistent feed material, membawa kepada 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? Untuk pengurus loji dan kontraktor kejuruteraan, the operational challenges are clear: kos tenaga yang semakin meningkat (selalunya $0.08$0.12 setiap tan yang diproses), strict environmental regulations on silt content (biasanya <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), penggunaan air yang tinggi (exceeding 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. GAMBARAN KESELURUHAN PRODUK

The HighEfficiency Sand Washing & Fines Recovery System (Model: SWR3000) adalah modular, closedloop processing unit engineered specifically for sand and gravel mining operations processing 150300 tan per jam. This system integrates three core functions: menyental, klasifikasi, and dewatering into a single, compact footprint.

Aliran Kerja Operasi:
1. Suapan & Menggosok: 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: Buburan (2025% pepejal) is pumped into a cluster of polyurethane hydrocyclones. This stage separates saleable sand (75600 mikron) from ultrafine silt (<75 mikron) with a cutpoint accuracy of ±5 microns.
3. Penyahairan & Stok: The classified sand slurry flows onto a highfrequency dewatering screen (0.5mm aperture). The screen produces a dripfree sand product with a surface moisture content of 1215%, ready for immediate stockpiling or loading.

Skop Permohonan: Ideal for river sand, crushed sand (pasir yang dihasilkan), and natural gravel wash plants. Batasan: Not designed for materials with >8% clay content without prescreening; requires a consistent feed rate of ±10% to maintain hydrocyclone efficiency.

3. CIRI TERAS

AbrasionResistant Polyurethane Components | Asas Teknikal: Poliuretana berketumpatan tinggi (Shore A 90) vs. standard rubber | Faedah Operasi: Reduces wear part replacement frequency by 60% in highsilica sand (Kekerasan Mohs 7) | Kesan ROI: Menjimatkan $12,000$18,000 annually in spare parts and labor for a 200 loji TPH.

Pemacu Frekuensi Boleh Ubah (VFD) on Main Pump | Asas Teknikal: 160kW motor with VFD controlling pump speed (8001450 Rpm) | Faedah Operasi: Allows operators to adjust cutpoint and recovery rate onthefly to match feed variations | Kesan ROI: Mengurangkan penggunaan tenaga dengan 1822% compared to fixedspeed pumps, penjimatan $0.015 setiap tan.

Integrated Silt Thickening Cone | Asas Teknikal: Gravity settling with a 45degree cone angle and underflow density control | Faedah Operasi: Tangkapan 90% air proses untuk digunakan semula segera, reducing fresh water intake | Kesan ROI: Cuts water consumption from 1,500 gal/ton to 400 gal/tan, lowering pumping and treatment costs.

QuickRelease Screen Panels | Asas Teknikal: Tensioned polyurethane panels with wedgelock system | Faedah Operasi: Screen deck changeout time reduced from 4 jam ke 45 minit | Kesan ROI: Increases plant availability by 34% setiap tahun, menterjemah kepada 1,500 additional tons of production.

DualFeed Inlet Design | Asas Teknikal: Two independent feed points with adjustable flow dividers | Faedah Operasi: Ensures even distribution across the hydrocyclone cluster, preventing roping and blockages | Kesan ROI: Menghapuskan 90% of cyclone blockages, reducing maintenance downtime.

Sistem Pelinciran Automatik | Asas Teknikal: Centralized grease pump with programmable intervals for all bearings and seals | Faedah Operasi: Eliminates manual greasing errors and extends bearing life by 40% | Kesan ROI: Menghalang kegagalan galas bencana, penjimatan $5,000 per repair event.

CorrosionResistant Steel Frame | Asas Teknikal: Keluli tergalvani hotdip (85micron coating) on all structural members | Faedah Operasi: Withstands constant exposure to water and abrasive slurry without rust | Kesan ROI: Extends equipment lifespan by 1015 years in coastal or highhumidity environments.

4. KELEBIHAN KOMPETITIF

| Metrik Prestasi | Piawaian Industri (Spiral Washer) | SWR3000 Solution | Kelebihan (% Penambahbaikan) |
| : | : | : | : |
| Fines Recovery Rate | 7580% (lost to pond) | 9295% (recovered) | +1520% |
| Kandungan Kelembapan Produk | 1822% | 1215% | 33% |
| Penggunaan Air | 1,2001,800 gal/tan | 350450 gal/tan | 70% |
| Pakai Part Life (Silica Sand) | 400600 jam | 1,2001,500 jam | +150% |
| Energy per Ton Produced | 1.82.2 kWj/tan | 1.21.5 kWj/tan | 30% |
| Masa Pertukaran (Skrin) | 4 jam | 45 minit | 81% |

5. SPESIFIKASI TEKNIKAL

• Model: SWR3000
• Kapasiti: 200300 Tph (dry sand basis)
• Saiz suapan: 010 mm (maks 15 mm)
• Keperluan kuasa: 185 kW jumlah (160 kW main pump + 25 kW screens & penghantar) @ 380V/50Hz/3Phase
• Spesifikasi Bahan: Poliuretana (taufan & skrin), Keluli AR400 (spiral shafts), 316L keluli tahan karat (water piping)
• Dimensi Fizikal: 18m (L) x 4.5m (W) x 6.5m (H) – modular skid design
• Berat: 28,000 kg (operational)
• Julat Operasi Persekitaran: 0°C to 45°C ambient; slurry temperature up to 60°C
• Keperluan Air: 350450 m³/hour at 34 bar inlet pressure

6. SENARIO APLIKASI

LargeScale River Sand Operation (Sichuan Province) | Cabaran: A 500 TPH plant was losing 40 TPH of fine sand (<150 mikron) to settling ponds due to inefficient spiral classifiers. Water usage was 1,600 gal/tan, exceeding local extraction permits. | Penyelesaian: Installed two SWR3000 units in parallel to process the 05mm fraction from the primary screen. | Keputusan: Fines recovery increased to 94%, adding 35 TPH of saleable concrete sand. Water consumption dropped to 420 gal/tan. The client achieved a 14month ROI on the equipment cost.

Pasir Kilang (Crushed Granite) Tumbuhan (Guangdong Province) | Cabaran: The VSI crusher produced sand with high fines content (18% berlalu 75 mikron), making it unsuitable for C30 concrete. Dewatering screens clogged every 2 jam. | Penyelesaian: The SWR3000 was configured with a 100micron hydrocyclone apex to remove excess fines. | Keputusan: Fines content in final product reduced to 5%. Screen blinding eliminated. The plant now produces 220 TPH of speccompliant manufactured sand, commanding a $2.50/ton premium.

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

7. PERTIMBANGAN KOMERSIL

Peringkat Harga Peralatan (FOB Shanghai Port):

• Pakej Standard (SWR3000S): $185,000 $210,000. Includes base unit, standard polyurethane wear parts, and manual lubrication.
• Pakej Premium (SWR3000P): $245,000 $275,000. Includes VFD on main pump, sistem pelinciran automatik, and 2year supply of wear parts.
• Pakej Turnkey (SWR3000TK): $320,000 $360,000. Includes all above, plus feed conveyor, penghantar produk, control panel with PLC, and onsite commissioning (5 hari).

Ciri Pilihan:

• Remote monitoring system (SCADAready): +$12,000
• Additional hydrocyclone cluster for higher capacity: +$18,000
• Slurry density gauge for automated cutpoint control: +$8,500

Pakej Perkhidmatan:

• Waranti Asas: 12 months on mechanical components, 6 months on wear parts.
• Extended Service Contract: $15,000/year includes 2 site inspections, sokongan teknikal keutamaan, dan 10% diskaun untuk alat ganti.
• Jaminan Prestasi: Optional addon guaranteeing 90% fines recovery or contract penalty.

Pilihan Pembiayaan:

• 30% down payment, 70% balance upon delivery.
• Leasing options available (3660 bulan) through partner financial institutions.
• Volume discounts for orders of 3+ unit (5% discount).

8. Soalan Lazim

Q: Can the SWR3000 handle feed material with high clay content (58%)?
A: ya, but we recommend a prescreening step (2mm aperture) 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?
A: Based on field data from 12 installations, the average payback period is 1418 bulan. This is driven by water savings ($0.03/ton), 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?
A: It is highly effective. The hydrocyclone cluster can be tuned to remove excess fines (biasanya 1520% in VSI sand) turun ke 35%. This is a common application for clients upgrading their MSand quality.

Q: Apakah masa utama untuk penghantaran?
A: Standard lead time is 810 minggu dari pengesahan pesanan. Turnkey packages require 1214 weeks due to integration and testing. Expedited delivery (6 minggu) is available for an additional 10% fee.

Q: Can the system be integrated with an existing plant control system?
A: ya. 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?
A: Polyurethane cyclones and screen panels carry a 6month warranty against manufacturing defects. Expected service life in typical sand (23% silika) is 1824 bulan. In highsilica sand (>5%), jangkakan 1218 bulan.

Q: Do you provide onsite training for operators?
A: ya. The Turnkey package includes 2 days of onsite training covering operation, penyelenggaraan, dan penyelesaian masalah. Additional training days are available at $1,500/day plus travel expenses.