Calcine, Calcination

The calcining process is used to remove some or all unwanted volatiles from a material (e.g. H2O, CO2) and/or to convert a material into a more stable or durable state. Varying temperatures are required to calcine various materials. For example, kaolins are calcined to form molochite. Normally materials are ground after calcining. Often calcining can produce a less stable from of a material that gradually wants to revert to the former carbonated or hydrated state. For a good example of this, mix calcium carbonate with kaolin and make a bar and fire it. Out of the kiln it will appear to be a hard ceramic but after several days it will absorb CO2 from the air and completely fracture into a powder. Pour water on it and it will immediately fracture and generate an amazing amount of heat.

Out Bound Links

• (Materials) Bone Ash - Ca5(OH)(PO4)3

  Calcium Phosphate

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