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    • 34. 发明授权
    • Reclamation of foundry sands
    • 铸造砂的回收
    • US4685973A
    • 1987-08-11
    • US696282
    • 1985-01-30
    • Michael C. Ashton
    • Michael C. Ashton
    • B22C5/18B08B7/04
    • B22C5/185
    • 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.
    • 使用硅酸钠粘合剂粘合的已使用的铸造砂通过在具有包括多孔膜的悬浮地板的增压室中用水搅拌而回收,停止搅拌并使固体沉降在地板上。 水通过并且沙子沉降在地板上,然后可以去除较细的颗粒,例如, 通过空气淘析。 与砂混合的水优选具有低于10的pH并含有絮凝剂,并且从容器回收的水具有低于500mg /升的悬浮固体含量。