How to make machine made sand from river pebbles? What equipment is used to break river pebbles?

To make machine-made sand from river pebbles, you can follow these steps:

1. Quarrying and crushing: River pebbles are collected from a quarry or a riverbed. The pebbles are then crushed to reduce their size using a crushing machine, such as a jaw crusher, cone crusher, or impact crusher.

2. Screening: The crushed pebbles are separated into different sizes using a screening machine, like a vibrating screen or a circular screen. The desired sand size can be obtained by adjusting the screen mesh.

3. Washing: The screened pebbles are washed to remove dust, dirt, and other impurities. This is done using a washing machine, such as a bucket wheel washer or a spiral washer.

4. Fine crushing: The washed pebbles are further crushed using a fine crusher, like a cone crusher or a vertical shaft impactor (VSI), to produce finer sand particles.

5. Grinding (optional): If you want to further reduce the sand particles' size, you can use a grinding machine, such as a ball mill or a vertical roller mill.

6. Classification: The crushed and ground sand is classified into different sizes using a classifier, like a cyclone or an air classifier. This helps in obtaining a uniform sand size distribution.

7. Dust removal and drying (optional): To ensure the quality of the sand, you can remove dust and moisture from the sand particles using a dust collector and a dryer, respectively.

8. Sieving and packaging: The final sand is sieved to remove any remaining large particles and impurities. The sand is then packed into bags or containers for distribution and use.

Some common equipment used for breaking river pebbles and making machine-made sand includes:

1. Jaw crushers: These are primary crushers that use a pivoting jaw to crush river pebbles into smaller particles.

2. Cone crushers: These are secondary and tertiary crushers that use a conical grinding surface to crush the pebbles further into smaller particles.

3. Impact crushers: These use a rotating hammer or impact plate to break the pebbles into smaller particles.

4. Vibrating screens: These separators are used to separate the crushed pebbles into different size ranges based on the screen mesh.

5. Bucket wheel washers: These are used to wash the crushed pebbles and remove dirt and dust.

6. Vertical shaft impactors (VSI): These are used for fine crushing and to produce sand with a good shape and high specific gravity.

7. Ball mills or vertical roller mills: These are used for grinding the sand to a finer size if required.

8. Cyclones or air classifiers: These are used for classification of the sand into different size ranges.

9. Dust collectors and dryers: These are used to remove dust and moisture from the sand particles if needed.

By following these steps and using the appropriate equipment, you can efficiently convert river pebbles into high-quality machine-made sand for various applications.