I. Equipment Design

The fine sand recovery machine consists of a chain plate feeder, a horizontal vibrating screen, a group of hydrocyclones, a dewatering screen, a slurry pump, a belt conveyor, and an intelligent electronic control system. All modules operate synchronously for efficient washing and recovery of sand and gravel.

II. Technological Process

First stage: uniform feeding and preliminary washing

The raw material is continuously and evenly fed through the chain plate feeder onto the horizontal vibrating screen. High-pressure washing water pipelines are installed on the surface of the vibrating screen. Under the combined action of the screen vibration and high-pressure water jets, the material undergoes thorough preliminary washing.

Second stage: screening and primary separation

• Separation of coarse fraction Coarse stones and impurities on the screen surface fall onto the lower conveyor and are transported to a specially designated storage area for centralized processing.
• Collection of fine fraction The mixture of sand, clay, and water passes through the screen and falls into the collection tank under the vibrating screen.

Third stage: classification in hydrocyclones and recovery

The slurry pump located beside the collection tank pumps the sand and water mixture into a group of hydrocyclones for precise classification:

• Sand recovery The separated fine sand is discharged from the bottom and falls onto the dewatering screen.
• Discharge of contaminated water Wastewater with clay overflows through the top outlet of the hydrocyclone and enters the wastewater treatment system.

Fourth stage: two-stage dewatering and finished product output

The recovered fine sand first undergoes preliminary dewatering on the first-stage screen, then proceeds to the finished product dewatering screen for deep dewatering. As a result, high-quality finished sand with a high degree of purity and low moisture content (≤15%) is obtained, which is transported by belt conveyor to the finished product storage area.

Design Diagram

Solution for a high-efficiency sand washing line on a small site in Guangdong Province

I. Project Background

A client from Guangdong Province faced a serious limitation in production space and urgently needed to build a sand washing line with a capacity of 100 tons per hour. Faced with the challenge of a small site, our company's engineering team conducted a thorough site survey, studied the client's requirements in detail, and developed a customized innovative   solution based on a modular sand washing line successfully solving the technical challenge of building a high-performance line on a limited area.

II. Technical Features of the Solution

Our company's engineering team applied an advanced   concept of volumetric modular design optimizing equipment layout, utilizing vertical space, and simplifying the technological process, enabling highly efficient production on a limited area. This solution not only perfectly addressed the key problem of insufficient space but also achieved multiple goals: compact equipment placement, smooth technological process, ease of operation and maintenance.

III. Key Advantages of the Modular Sand Washing Line

1. Maximally efficient use of space

Volumetric layout

• Use of a multi-tier cascade structure with maximum utilization of vertical space
• Compact equipment placement, area reduced by   40%-50%
• Suitable for suburban areas, mountainous regions, and other territories with limited space

Comparative data

2. Short installation time

Advantages of rapid deployment

• Standardized modules, factory pre-assembly
• On-site only requires: foundation + module installation + pipeline connection
• Total installation time   7-15 days reduced by   60%-70%   compared to traditional methods

Comparison of construction process

3. Optimization of investment costs

Economic efficiency analysis

• Construction cost reduction by 30%-40% less foundation work volume, no need for large hard surface area
• Equipment cost optimization by 15%-20% modular integrated design, less auxiliary equipment
• Installation cost savings of 50% fast installation, significant reduction in labor intensity
• Overall investment savings of 25%-35% total investment significantly lower than traditional solution

4. High operational efficiency

Performance guarantee

• Optimized equipment layout, smooth material flow, no reloading
• High degree of automation, less manual intervention, reduced accident rate  40%
• Optimized energy efficiency, electricity consumption per ton of sand reduced by   15%-20%

Actual operational data (project in Guangdong)

• Design capacity: 100 t/h
• Actual capacity: 95-105 t/h (output coefficient ≥95%)
• Clay content in finished sand: ≤2% (above industry standard)
• Moisture: ≤12% (meets requirements for commercial concrete)
• Equipment utilization rate: ≥90% (industry leader)

5. High flexibility

Multi-scenario adaptability

• Mobility : modular design, complete disassembly and relocation possible if necessary
• Scalability : if capacity is insufficient, modules can be quickly added to increase productivity
• Adjustability : flexible adjustment of technological parameters depending on raw material characteristics
• Multifunctionality : suitable for construction waste, river pebbles, machine sand, and other materials

6. Intelligent control

Digital control system

• Equipped with a centralized PLC control system, start and stop with one button
• Real-time monitoring of key parameters (productivity, moisture, granulation, etc.)
• Automatic fault alarm, remote diagnostics and maintenance
• Cloud data storage, automatic generation of production reports

7. Excellent environmental performance

Guarantee of environmentally friendly production

• Fully enclosed design, dust emissions ≤10 mg/m³
• Water recirculation rate ≥85%, zero wastewater discharge
• Noise control ≤75 dB(A), meets environmental requirements
• Small footprint, minimal environmental impact

IV. Customer feedback and social impact

Customer feedback

"The modular solution from your engineering team perfectly solved our limited site problem. After commissioning the production line, it operates stably, productivity meets standards, maintenance is simple, and the investment payback period was reduced by 30% compared to expectations. This is a very successful cooperation!"

— Mr. Zhang, project client in Guangdong

Social impact

• Promotion of technological progress in the industry : provided a benchmark case for building high-efficiency lines on small sites
• Facilitation of rational resource use : reduction of land use, increased space utilization efficiency
• Acceleration of industrial transformation and modernization : helping the sand and gravel industry move towards intelligence and environmental friendliness

V. Technical summary

The modular sand washing line, thanks to its outstanding advantages —   small footprint, fast construction, low investment, high efficiency, great flexibility   — has become the preferred solution for building sand washing lines in space-limited areas. Our company will continue to innovate, providing customized high-efficiency solutions for more clients and contributing to the high-quality development of the sand and gravel industry.