How can river pebbles be made into sand? How much is a river pebble sanding machine?

River pebbles can be made into sand through a series of crushing and screening processes. The typical steps involve crushing the pebbles into smaller particles, then passing them through a series of screens with different mesh sizes to separate the sand from the larger chunks. Here's an outline of the process:

1. Crushing: River pebbles are fed into a crushing machine, such as a jaw crusher, cone crusher, or impact crusher. The machine crushes the pebbles into smaller particles, typically with a size range of 10-50 mm.

2. Screening: The crushed pebbles are then passed through a series of screens with different mesh sizes. The screens separate the sand particles (typically with a size range of 0.1-5 mm) from the larger chunks. The sand particles pass through the screens and are collected, while the larger chunks are sent back to the crusher for further processing.

3. Grading: After screening, the sand particles may need to be further graded to ensure a consistent particle size distribution. This can be done using a series of screens or a classifier.

4. Water separation (optional): In some cases, water is used to separate the lighter sand particles from the heavier ones. This can help to remove any fines or dust that may be present in the sand.

The cost of a river pebble sanding machine depends on several factors, including the machine's size, capacity, and any additional features or customizations. Generally, expect to pay anywhere from several thousand dollars to over $?100,000 for a high-capacity, industrial-grade machine. The exact price will vary depending on the manufacturer, the model, and the configuration.

It's essential to research different manufacturers and compare their offerings based on your specific requirements, budget, and the quality of their products. Always consider the machine's durability, efficiency, and ease of maintenance when making your decision.