The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 11, 1987
Filed:
Jan. 30, 1985
Applicant:
Inventor:
Michael C Ashton, Sheffield, GB;
Assignee:
Steel Castings Research and Trade Association, Sheffield, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B08B / ;
U.S. Cl.
CPC ...
134 13 ; 134 19 ; 134 21 ; 134 251 ; 134 30 ; 134 36 ; 164-5 ; 210732 ;
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.