Quote Originally Posted by elk-a-holic View Post
Sand muller?
Mulling is a process where the sand to be used in metal casting is mixed with proper components, typically fine sand, clay for a binder, and oil or water.

It is energy intensive work to do with out a machine. Basically mixing the components, and breaking up clumps in the sand. During initial mulling, naturally occuring clumps are broken up. During casting, the heat from the metal tends to bond the sand into clumps, especially that close to the hot metal. It is often necessary to re-mull the sand so it can be reused.

The riddle, or sifter, is used to assure the clumps are out.


https://www.howimportant.com/importa...g-sand-control