Abstract: A process is disclosed for removing heavy metals, dissolved aluminum, sulfides and organic compounds from a caustic etch solution, thereby regenerating the etching power of the solution or facilitating its disposal into the environment. The process consists of forming a first filtrate from which heavy metals present in the solution have been removed, and a second filtrate obtained by precipitating and oxidizing residual chemicals remaining in the first filtrate. The latter is done over a selected pH and temperature range. The second filtrate is then either reclaimed back to the etching tank, or subjected to ozonization prior to disposing of it into the environment.
Type:
Grant
Filed:
September 19, 1988
Date of Patent:
October 2, 1990
Assignee:
Caspian International, Inc.
Inventors:
Florimel Doble, Jose M. Gallego, El Steidl, Cyrus Jaffari
Abstract: A process is disclosed for removing heavy metals, dissolved aluminum, sulfides and organic compounds from a caustic etch solution, thereby regenerating the etching power of the solution or facilitating its disposal into the environment. The process consists of forming a first filtrate from which heavy metals present in the solution have been removed, and a second filtrate obtained by precipitating and oxidizing residual chemicals remaining in the first filtrate. The latter is done over a selected pH and temperature range. The second filtrate is then either reclaimed back to the etching tank, or subjected to ozonization prior to disposing of it into the environment.
Type:
Grant
Filed:
November 3, 1986
Date of Patent:
May 2, 1989
Assignee:
Caspian International, Inc.
Inventors:
Florimel Doble, Jose M. Gallego, El Steidl, Cyrus Jaffari