Melting

Melting is the process wherein a rigid solid substance changes from the solid phase to the easily shape-able liquid phase.

Precious metal needs to be raised to its melting point to separate it from the other unwanted materials present and to cast it into the desired shape.

The melting is carried out in a furnace, which will heat the material to above its melting temperature – 1,100ºC for gold, 900 to 1,000ºC for silver, 1,500ºC for palladium and 1,550 to 1,800ºC for platinum. Furnaces vary from small ones, which will take a maximum of a kilogram of material, up to large constructions, which can melt tens of kgs at a time.


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