Green Sand Definition
Green sand is a type of sand used by a sand cast foundry in the green sand molding process. Green sand is a mixture of silica sand, bentonite, and water. The bentonite acts as a binder holding the sand particles together. The water or moisture is necessary not only to help hold the sand particles together, but also to cools the sand as it reacts to the molten aluminum. One of the key advantages to the green sand is that it is entirely recyclable.
Properties of Green Sand
Green sand’s unique properties make it ideal for molding in aluminum casting. Key characteristics include:
The Recycling Process of Green Sand
One of green sand’s primary benefits is its recyclability. After each casting, the sand is recovered and rejuvenated by reintroducing moisture and bentonite, restoring its binding and plastic properties. Recycled green sand is then reused for multiple casting cycles, making it an eco-friendly and cost-effective option for foundries. The sand recycling process also reduces waste and conserves natural resources by minimizing the need for new materials.
