Considering process solutions or beneficial reuse options to resolve where all the spent foundry sand will go.
Article excerpt from the Foundry Management & Technology February 2020 issue by Rob Steele.
For years, foundries have been asking, “Where will all the sand go?” They have looked for ideas or innovations to deal with over 10 million tons of spent green sand from molding and core making operations annually — and particularly for sustainable treatment processes. Specifically, they have been looking for process solutions or options for beneficial reuse of all that sand.
Let’s focus on the green-sand dust collector fines, usually rich in active clay and carbon. The ideal treatment technique would:
1) reclaim active clay and lustrous carbon from the dust collector material
2) use a water-based reclamation process to separate sand, clay, and carbon
3) implement no chemicals or unusual by-products
4) result in a clay slurry that has excellent performance characteristics