Apparatus for recovering calcium fluoride from fluoroetchant

Chemical apparatus and process disinfecting – deodorizing – preser – Chemical reactor – Including heat exchanger for reaction chamber or reactants...

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422225, 422243, 423507, F28D 2100

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active

053824237

ABSTRACT:
Fluorine is recovered as calcium fluoride from a fluoroetchant solution composed mainly of hydrogen fluoride and ammonium fluoride using a sealed reaction tank equipped with a supply port for adding the fluoroetchant solution to the tank, a supply port for adding calcium carbonate to the tank, a vapor supply port for adding steam to heat the solution in the tank, an air supply port for providing air to aerate the contents of the tank, a stirrer for stirring the contents of the tank, an ejector for removing vapors from the tank connected to the tank via a mist separator for separating mist from the vapors being removed from the tank, and an exhaust port for removing calcium fluoride from the tank.

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patent: 4892707 (1990-01-01), Stockton et al.
patent: 4996029 (1991-02-01), Martin et al.
patent: 5035867 (1991-07-01), Dang Vu et al.
patent: 5180512 (1993-01-01), Nakatani et al.

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