F - Mech Eng,Light,Heat,Weapons – 27 – B
Patent
F - Mech Eng,Light,Heat,Weapons
27
B
23/390, 23/397,
F27B 9/14 (2006.01) B01J 6/00 (2006.01) C01B 7/01 (2006.01) C01G 49/02 (2006.01) C23G 1/36 (2006.01) C01B 7/00 (2006.01)
Patent
CA 1099902
ABSTRACT OF THE DISCLOSURE This specification discloses a system comprising apparatus for regenerating waste acid liquor, primarily waste hydrochloric acid pickling liquor used in the pickling of steel. Thus pickling liquor comprises primarily iron chloride and impurities in an aqueous solution, which is first concentrated by direct contact with hot gases from the reactor of the system. This contact not only cools these hot gases but simultaneously removes any hydrogen chloride which may still remain in the spent liquor as well as evaporate some of the water therein. The resulting liquor concentrate is sprayed into a non-caking fluid bed type reactor normally heated to convert the iron chloride into iron oxide and hydrogen chloride gas, however at lower temperatures even chloride salt can be produced. The resulting gases and dust of iron oxide from the reactor are separated in a cyclone separator and then passed through a venturi in a concentrator, wherein the gases are mixed directly with the waste liquor to be concentrated and when passed into an economizer for cooling and collecting the concentrated waste liquor. The resulting hydrogen chloride gas and combustion gases from the reactor are then passed through an absorber to remove the hydrogen chloride gas in water to form hydrochloric acid which may be returned directly to the pickling process. The resulting unabsorbed gases are scrubbed to remove remaining hydrogen chloride gas and then are condensed before being passed out into the atmosphere. The liquids collected from these scrubbers are returned to the system.
281509
Gowling Lafleur Henderson Llp
Toledo Pickling & Steel Service Inc.
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