Silicate treatment of impure silica sands

Details Silicate treatment of impure silica sands Silicate treatment of impure silica sands

1983-01-20

1984-09-04

Hayes, Lorenzo B.

Compositions: coating or plastic

Coating or plastic compositions

Molds and mold coating compositions

106 3835, 106 387, 106 84, 164527, 427214, 427215, 427221, 428404, 428407, 523142, 523145, B28B 734

Patent

active

044695179

ABSTRACT:
A process is provided for treating impure silica-containing sands to make them more suitable for foundry use. The sands are treated with aqueous alkali metal silicate solutions and the resulting mixture is heated before the sands are coated with a resin binder. Foundry cores and molds prepared with these treated sands show improved hot and cold tensile strengths.

REFERENCES:
patent: 2128404 (1938-08-01), Dunbeck
patent: 2818620 (1958-01-01), Moore
patent: 2947641 (1960-08-01), Bleuenstein
patent: 3074802 (1963-01-01), Alexander et al.
patent: 3409579 (1968-11-01), Robins
patent: 4154894 (1979-05-01), Bushey
Kirk-Othmer, Ency. of Chemical Tech., Third ed., vol. 6, pp. 208-209.

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