Abstract
We have been investigating the geological origin, crystal structure, hot properties and refractoriness of 4 foundry silica sands in Tōkai district; Mikawa Synthetic Silica Sand, Seto Conical Silica Sand, Seto Natural Silica Sand and Chita Beach Sand.
Now we report the result investigated by crashing of these silica sands at room temperature. Crashing method is the shock-crashing by ramming. The grain sizes of these sands are 35, 48, 65, 100 and 150 mesh.
The gists of the experiments are as follows:
1. The crashing of these silica sands at grain size and kind has each characteristic.
2. We found that these characteristics are closely connected with the geological origin of each silica sand.
3. The smaller the grain size of silica sand is, the more the difference of the crashing of these silica sand decreases.
4. As for Synthetic Silica Sand, Conical Silica Sand and Natural Silica Sand, the bigger the grain size of these is, the more easily they crash.
