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US 6,834,706 B2Granted
Process for recovering sand and bentonite clay used in a foundry
AssigneeFoundry Advanced Clay Technologies, L.L.C.
InventorsRobert C. Steele, Allen James Huff
Life of this patent
Estimating the term…
Abstract
Sand, bentonite clay and organics recovered as foundry waste from a green sand mold foundry are reclaimed for reuse in making new green sand molds and mold cores by a multi-step process involving both hydraulic and mechanical separation steps.
Claims16
A process for reducing the amount of prime sand needed for the operation of a green sand foundry producing green sand molds, the foundry also producing foundry waste in the form of bag house dust and molding waste, the process comprising:
- hydraulically separating a slurry of the bag house dust in a first hydraulic separation step to produce an underflow stream containing at least about 40% of the sand in the bag house dust and an aqueous overflow stream containing at least about 60% of the bentonite clay in the bag house dust, and
- reusing the sand in the underflow stream to make additional green sand molds.
Dependencies are inferred from the claim text.