The simplest foundry process to use is sand casting foundry. Of course, not just any type of sand should be used.
Casting sands are a mixture of sand (silica) with a binder. This binder can be natural or chemical. The binder is there to hold the mold to the shape of the part until the solidification of the metal, but thereafter the mold must be easily destroyed to extract the part.
In homemade use, the most common is green sand (sand + clay + water) but there are also sands whose binder is oil.
It is also possible to use soda silicate as a binder, in this case the binder is chemical and the hardening of the mold or the core is done by gassing the sand/silicate mixture with CO2. This last technique is very useful for cores but, of course, can be used for the complete mould.
The recipes that are given in this article are recipes that I have tested until bronze casting.
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