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Defluorination

During firing, clay releases the fluorine it contains into the atmosphere. Fluorine is a greenhouse gas that can damage the atmosphere. The process of removing it is called defluorination.

Defluorination can be achieved by two different processes:

• In a static scrubber when the flue gases are passed through a filter of calcium carbonate, or
• Through entrapment in the body of the bricks or the tiles during firing after blending the clay with calcium carbonate filler.
  
  

Fluorine abatement is covered by EC Directive 96/61 on integrated pollution prevention and control (IPPC), which was adopted in September 1996. Member states have subsequently transposed its requirements into national legislation.