| 摘要 |
The present invention concerns the use of an aqueous solution of a silicate as a binder, particularly for hardening foundary molds and cores without the use of acid or other reagents to convert the silicate into a silican gel. According to the present invention, the silicate binder is not reacted but instead is rapidly dried, preferably enough within the space of 5 seconds to 10 minutes to reduce the initial water content of the aqueous silicate solution by at least 25%. In the preferred embodiments, this is achieved by forcing air through opposed porous sides of the mold box and the green sand contained therein. The present invention is also applicable to other composite forms such as the manufacture of plywood, particle board, briquettes, and the like. |
