Reclamation of foundry sands

Details Reclamation of foundry sands Reclamation of foundry sands

1985-01-30

1987-08-11

Hruskoci, Peter

Cleaning and liquid contact with solids

Processes

Including regeneration, purification, recovery or separation...

134 19, 134 21, 134 251, 134 30, 134 36, 164 5, 210732, B08B 704

Patent

active

046859730

ABSTRACT:
A used foundry sand, especially one which has been bonded using sodium silicate binder, is reclaimed by agitating the sand with water in a plenum chamber having a suspended floor comprising a porous membrane, stopping the agitation and allowing the solids to settle on the floor. The water passes through and the sand settles on the floor, and the finer particles may then be removed e.g. by air elutriation. Preferably the water mixed with the sand has a pH below 10 and contains a flocculant, and the water recovered from the vessel has suspended solids content below 500 mg/liter.

REFERENCES:
patent: 2766496 (1956-10-01), Ward
patent: 3436260 (1969-04-01), Duff
patent: 3716780 (1973-02-01), Finley et al.
patent: 4113510 (1978-12-01), Richard
patent: 4144088 (1979-03-01), Adams
patent: 4303453 (1981-12-01), Jung et al.

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