Phosphorus absorption by hydration and fluorine recovery for fume exiting kiln in kiln phosphoric acid process
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United States of America Patent
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Jul 17, 2018
Grant Date -
Jun 2, 2016
app pub date -
Dec 3, 2015
filing date -
Jun 4, 2013
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Abstract
Disclosed is a method for phosphorus absorption by hydration and fluorine recovery for a fume exiting a kiln in a kiln process for the production of phosphoric acid, comprising the following steps: a fume containing P2O5 and fluorine exiting a kiln is introduced into a hydration tower, the fume performs heat and mass transfer with the spraying liquid, with most of the phosphoric acid produced being absorbed into the spraying liquid; the phosphoric acid solution falling from the spraying finally enters the acid solution circulating and spraying system; the fume discharged from a fume outlet then passes through a phosphoric acid mist capturing tower and a mist removing and separating tower successively, such that the phosphoric acid mist entrained in the fume exiting the hydration tower is further captured.
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