Recirculating system sand

Bentonite-bound mold material (green sand) which is re-conditioned after each cycle.

Additives such as bentonite, new sand, lustrous carbon formers, and water are added to the relevant mixing unit until the sand has regained its original molding technology properties (strength, plasticity).

Additional references:
Mold sand testing
Sand reclamation
Mold material circulation
Mold material recovery
Mold material control