Liquid purification or separation – With alarm – indicator – register – recorder – signal or... – Responsive to fluid flow
Patent
1977-11-23
1979-01-23
Adee, John
Liquid purification or separation
With alarm, indicator, register, recorder, signal or...
Responsive to fluid flow
210 46, 210 47, 210 59, 156642, C02B 120
Patent
active
041360265
ABSTRACT:
A method of controlling the dissolved aluminum content of a caustic solution for etching aluminum comprises providing a tank of an etching solution containing sodium hydroxide and water and etching aluminum in the solution to dissolve aluminum therein. A portion of this etch solution is introduced to a reactor for purposes of lowering its aluminum content by treating with aluminum hydroxide. The treatment is capable of causing dissolved aluminum to precipitate from the etch solution in a mean residence time of less than 5 hours. A portion of the solution in the reactor is filtered to remove aluminum hydroxide solids to an extent sufficient to prevent precipitation in the etching tank. The filtered solution is then returned to the etching tank thereby controlling the aluminum content of the etching solution.
REFERENCES:
patent: 2828193 (1958-03-01), Newman
patent: 2975041 (1961-03-01), Holman
patent: 3486954 (1969-12-01), Ashcraft
patent: 3607482 (1971-09-01), Selm
patent: 3712838 (1973-01-01), Weissenberg
patent: 3909405 (1975-09-01), Aoyama
Johnson Wayne F.
Meyer Raymond J.
Wodehouse Richard A.
Adee John
Alexander Andrew
Aluminum Company of America
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