Calcination

As calcination or calcination (from Latin calx, calcinatio for the process of burning of different substances ) is called in the chemical heating (burning ) of a material with the aim to drain this to discolor or decompose.

The eponymous reaction occurs when lime, and as part of the technical Kalkkreislaufs, from.

But the process takes place in the gypsum industry and generally in the removal of crystal water from the hydrated salts (for example, soda ash ). When clay and porcelain firing also bound water evaporates under simultaneous sintering of the particles.

Details for the production of petroleum coke see delayed coking.

Technical ( corundum) or petroleum coke, for example, makes the calcination in the manufacture of cement, alumina, play a role. Above all, rotary kilns are used.

History

Already in ancient Roman times they won calcium oxide by calcination, for example, for the construction of the Limes.

In alchemy, calcination played an important role in making the Philosopher's Stone. The term " calcinatio " described here pulverizing substances, and the dehydration. Under calcination or calcination is understood in the Spagyrik ashing of dried medicinal plants.