Calcination

[Sarah]

The act or process of disintegrating a substance, or renderingit friable by the action of heat, esp. by the expulsion of somevolatile matter, as when carbonic and acid is expelled from carbonateof calcium in the burning of limestone in order to make lime.

[Raeanne Dimick]

A process in which a material is heated to a high temperature without fusing, so that hydrates, carbonates, or other compounds are decomposed and the volatile material is expelled.