Guangzhou Huangpu District Sand Washing Production Line

Technical Requirements:

1. Raw materials are foundation soil and shield tunneling material.
2. The ratio of mud to sand in raw materials is 1 to 1;
3. Hourly production requirement is 200t/h.

Based on the above data, the following production line, process flow, and related data are formulated:

Water volume and equipment configuration: excluding conveyor belts

The water consumption of this production line is about 400m³/h.

Revolutionary high-efficiency sand washing and water recycling process solution: achieving ultimate recovery and cost control

Introduction

This process solution is specially designed to address core issues in traditional sand washing operations such as high fine sand loss rate, large water consumption, and high operating costs. Through the ingenious combination of multi-stage serial washing, dual recovery of coarse and fine sand, and efficient closed-loop water circuits, this plan improves finished sand quality while achieving unprecedented resource utilization and cost efficiency.

Stage One: Primary Washing and Impurity Separation

1. Feeding and Pre-washing: Raw materials are fed from the hopper via conveyor belt to the distributor, evenly diverted to two rotary screens.
2. Powerful Scrubbing: At this stage, the material is immediately mixed with 20% fresh water and 80% recycled water. The high-speed rotation of the rotary screens combined with strong water flow efficiently separates large impurities and stones.
3. Primary Separation: Impurities and stones are separated and discharged; sand and wastewater proceed to the next stage.

Stage Two: Dual Recovery of Coarse and Fine Sand and Deep Scrubbing

1. Coarse Sand Scrubbing: The sand-water mixture enters the 2LH1575 double spiral sand washer. Through strong spiral scrubbing and stirring, soil is further broken down, coarse sand is washed and sent to the ZS2424 dehydration screen for preliminary dewatering, then into the transfer water tank.
2. Fine Sand Recovery (Key): Muddy sand water discharged from the spiral sand washer overflow trough and wastewater from the dehydration screen are collected into the BT800 fine sand recovery machine.
3. Cyclone Separation: The fine sand recovery machine uses a cyclone to efficiently separate fine sand, which after dewatering is also sent to the transfer water tank; separated wastewater is discharged to the sewage pool.

Stage Three: Final Washing and Efficient Water Recycling

1. Quality Improvement: At this point, finished sand and fine sand (with mud content reduced to about 10%) collected in the transfer water tank are flushed with 80% fresh water for high-purity washing.
2. Finished Sand Output: Sand is sent to the XSφ6000 impeller sand washer, where rotation, tumbling, washing, and scooping complete the final "fine washing" process, then dewatered by the ZS2430 dehydration screen to produce high-quality finished sand.
3. Closed Water Circuit: Overflow water from the impeller sand washer and water discharged from the dehydration screen (i.e., 80% recycled water used in stage one) are collected and pumped back to the front end rotary screens to wash new raw materials, forming a clever and efficient self-circulating water system.

Core Process Advantages: Redefining Industry Standards

1. Excellent Product Quality: Indicators as Standards

The finished sand produced by this process far exceeds the industry average, with all key indicators meeting the national "Construction Sand" standards:

• Fine Sand Recovery Rate: Up to 95%, greatly reducing resource loss and increasing overall value.
• Finished Product Mud Content: Strictly controlled between 1% and 2%, pure quality with strong market competitiveness.
• Finished Product Moisture Content: As low as 5%, easy for storage and transportation.
• Stone Powder Moisture Content: Controlled within 10%.

2. Ingenious Water Recycling Design: A Model for Cost Reduction and Efficiency Improvement

Water circuit design is the soul of this plan. We achieve "washing the cleanest sand with the least water":

• Efficient Recycling: About 80% of the water volume is reused twice within the system, minimizing fresh water consumption.
• Emission Reduction and Cost Saving: Greatly reduces total wastewater discharge, saving massive materials, time, and labor in subsequent wastewater treatment, significantly lowering treatment costs.

3. High Output and Low Consumption: Maximizing Return on Investment

Through streamlined and efficient equipment configuration and clever process layout, we help customers achieve "low investment, high output":

• Outstanding Energy Efficiency: The output of a single core device in the process can rival the combined output of two or even more devices in similar solutions on the market.
• Streamlined Configuration: Device unification and reduced quantity mean less infrastructure investment and shorter preliminary project timelines.
• Operational Advantages: During normal operation, less manual labor is required; equipment maintenance and servicing are convenient and efficient, significantly reducing downtime.

Summary

This solution truly achieves the excellent operational goals of low cost, high output, and quick returns, making it an ideal choice for the upgrade and transformation of the modern sand and gravel aggregate industry.