Acid activated clay for use in foundry sand

Details Acid activated clay for use in foundry sand Acid activated clay for use in foundry sand

2005-03-01

2005-03-01

Lin, Kuang Y. (Department: 1725)

Metal founding

Process

Shaping a forming surface

C164S527000, C106S038200, C106S038900

Reexamination Certificate

active

06860319

ABSTRACT:
A foundry sand binder formed by reacting a smectite clay containing exchangeable calcium ions with an acid to enhance the ability of the clay to bind sand in forming a metal casting sand mold. The acid-treated clay is an excellent sand binder for metal casting molds and produces cast metal parts having improved surface finish with the elimination or substantial reduction in carbonaceous, e.g., coal, foundry sand additive, while reducing VOC emissions from the foundry.

REFERENCES:
patent: 4163000 (1979-07-01), Kashima et al.

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