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Foundry molds and
cores for the production of metal castings are made
from quartz sand. The manufacture of
high-temperature silica brick for use in the linings
of glass- and steel-melting furnaces represents
another common use of crystalline silica in
industry.
Silica has a high
melting point, 1610degrees C. This enables casting
to be produced by pouring molten metal into moulds
make out of silica sand
The American Society
for Testing and Materials (ASTM) and The American
Foundrymens Society (AFS) classify sand by particle
size. Sand is generally classified as any none
metallic mineral aggregate, which has a sieve size
between the 12 and 270 mesh. |
