How do you separate crushed rubber from sand?

To separate crushed rubber from sand, one method is using a sieve or mesh screen with small enough openings for the sand to pass through but trap the rubber particles. Another method is to utilize water flotation, as rubber is less dense than sand and can float to the surface while the sand sinks. Alternatively, you could use air separation by blowing air through the mixture to carry the lighter rubber particles away while the heavier sand remains in place.