Construction Sand and Gravel Industry Application and Advantages of Filter Press

In the construction sand and gravel industry, filter press, as a high-efficiency solid-liquid separation equipment, is widely used in sand and gravel aggregate production, sand washing wastewater treatment and tailings dehydration. Its technical advantages significantly improve resource utilization and environmental benefits. The following elaborates on its application scenarios and core advantages from multiple dimensions:

一、Application Scenarios

1. Sand Washing Wastewater Treatment
 The filter press can quickly dehydrate the mud produced by sand washing, separate the filter cake with a water content of 15%~25% and the clear filtrate, realize the recycling of wastewater, and reduce the consumption of clean water.

2. Recovery of fine powder of machine-made sand
For the stone powder mud in the production of machine-made sand, the filter press separates fine sand (particle size <0.075mm), improves the rationality of machine-made sand grade matching, and reduces resource waste.

3. Dry tailings discharge process
 Combined with the concentration equipment, the filter press deeply dehydrates the tailings slurry to form a dry residue filter cake, which meets the requirements of dry stacking or comprehensive utilization of the tailings pond and reduces the risk of dam breach.

4. Harmless sludge disposal
 When treating sludge containing heavy metals or impurities, the filter press forms a stable filter cake through high-pressure extrusion, which is convenient for subsequent landfill or resource utilization, reducing environmental risks.

5. Concrete mixing station wastewater treatment
 Recycle the fine particles in the wastewater of the mixing station, separate the clean water and reuse it in production, and achieve zero wastewater discharge.

二、Technical advantages

1. High-efficiency dehydration performance
 Using high-pressure diaphragm secondary pressing technology, the moisture content of the filter cake is reduced by 30%~50% compared with traditional equipment, significantly improving the solid phase recovery rate (＞95%).

2. Energy saving and consumption reduction
 The unit processing energy consumption is only 1/3 of that of the centrifuge, and no heat source drying is required, with a comprehensive energy saving of more than 40%.

3. Modular design
 The plate-and-frame structure supports flexible expansion, and the single-machine processing capacity can reach 200m³/h, which is suitable for the needs of sand and gravel plants of different sizes.

4. Intelligent control
 The PLC automatic control system realizes the automation of the entire process of feeding, filtration and unloading, reduces manual intervention, and the operation stability reaches more than 98%.

5. Environmental compliance
 The filtrate SS concentration is less than 100mg/L, and the COD removal rate exceeds 90%, meeting the GB 8978 sewage discharge level 1 standard.

6. Significant economic benefits
 The cost of mud treatment per ton is as low as 2~5 yuan, the clean water reuse rate is increased to 85%, and the annual water cost savings exceed one million yuan (based on a sand and gravel plant with an annual output of 5 million tons).

7. Material tolerance
 The filter plate is made of reinforced polypropylene or alloy steel, which is resistant to acid and alkali corrosion and has a service life of 8 to 10 years.

8. Small footprint
 The vertical structure saves 70% of the site compared with the traditional sedimentation tank and is suitable for the intensive production line layout.

9. Low safety risk
 Closed operation avoids dust, and the hydraulic system is equipped with overload protection to prevent safety accidents.

三、Industry development trend
 With the stricter requirements on mud content in GB/T 14684-2022 for "Sand for Construction" (MB value of machine-made sand ≤1.4), the core position of the filter press in the quality control of sand and gravel aggregates is highlighted. In the future, the intelligent filter press system integrating 5G remote monitoring and AI parameter optimization will become the industry standard, promoting the transformation and upgrading of the sand and gravel industry to green and intelligent.

Filter presses continuously optimize the production process of the construction sand and gravel industry through technological innovation, and demonstrate irreplaceable value in environmental protection, resource recovery and cost control. They are key equipment for sand and gravel enterprises to achieve sustainable development.