How to wash manufacturing sand ?

Washing manufacturing sand, also known as manufactured sand (M-sand), is a crucial process to ensure that the sand is clean and free from impurities such as clay, silt, and dust. This process enhances the quality of the sand, making it suitable for use in construction and other applications. Here is a detailed guide on how to wash manufacturing sand:

1. Understanding the Need for Washing

Manufactured sand is produced by crushing rocks, quarry stones, or larger aggregates into sand-sized particles. During this process, fine particles such as clay, silt, and dust can adhere to the sand particles. Washing is necessary to remove these impurities, which can affect the strength and durability of the concrete or mortar in which the sand is used.

2. Equipment Required

To wash manufacturing sand, you will need the following equipment:

• Sand Washing Machine: This is the primary equipment used for washing sand. It can be a wheel-type or spiral-type sand washer.
• Water Pump: To supply water for the washing process.
• Settling Tank: To collect and settle the wastewater and recover fine sand particles.
• Conveyor Belts: To transport the washed sand to the storage area.

3. Washing Process

Step 1: Feeding the Sand

The raw manufactured sand is fed into the sand washing machine. This can be done using a conveyor belt or a hopper.

Step 2: Washing

The sand washing machine uses water to wash away the impurities. The machine has a rotating wheel or spiral that agitates the sand, allowing the water to wash away the fine particles. The water flow should be controlled to ensure that the sand is thoroughly cleaned without being washed away.

Step 3: Dewatering

After washing, the sand is dewatered to remove excess water. This can be done using a dewatering screen or a hydrocyclone. The dewatering process helps to reduce the moisture content of the sand, making it suitable for use.

Step 4: Settling and Recycling Water

The wastewater from the washing process is collected in a settling tank. Here, the fine particles settle at the bottom, and the clear water is recycled back into the washing process. This helps to conserve water and reduce environmental impact.

Step 5: Drying and Storage

The washed and dewatered sand is then transported to a storage area where it is allowed to dry. The drying process can be natural (air drying) or mechanical (using a dryer). Once dry, the sand is ready for use in construction or other applications.

4. Quality Control

It is essential to monitor the quality of the washed sand regularly. This includes checking for:

• Particle Size Distribution: Ensuring that the sand particles are of the desired size.
• Cleanliness: Ensuring that the sand is free from impurities such as clay, silt, and dust.
• Moisture Content: Ensuring that the sand has the appropriate moisture content for its intended use.

5. Environmental Considerations

Washing manufacturing sand can have environmental impacts, particularly related to water usage and wastewater disposal. It is important to:

• Use Water Efficiently: Implement water recycling systems to minimize water usage.
• Properly Dispose of Wastewater: Treat the wastewater to remove impurities before discharging it into the environment.
• Minimize Dust Emissions: Use dust suppression techniques to reduce dust emissions during the washing and drying processes.

Conclusion

Washing manufacturing sand is a critical process to ensure the quality and suitability of the sand for construction and other applications. By following the steps outlined above and using the appropriate equipment, you can effectively wash and prepare manufacturing sand for use. Regular quality control and environmental considerations are also essential to ensure the sustainability and effectiveness of the washing process.