When concentrating phosphoric acid, silicon tetrafluoride
(SiF4) and fluorhydric acid (HF) evaporate. If emitted into the
atmosphere randomly, these molecules can be harmful to the environment.
If the SiF4 content is high, the emissions can cause scaling
in the condensers and the cooling sections of the concentration
units.
These products are captured using absorption towers.
In these towers, the SiF4 and the HF are absorbed into a fluosilicic
acid (FSA). This solution can be neutralised or used as a raw
material for the production of fluorine products.
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The Prayon
design has the following characteristics:
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"Image courtesy
of SNC-Lavalin Europe"
