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US 2019/0062928 A1Published application
Methods, Systems And Apparatuses For Copper Removal From Aluminum Desmutting Solutions
AssigneeThe Boeing Company
InventorsDavid L. Crump, Lance E. Succo, David Huebner, Mark R. Woodruff
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Abstract
Methods, systems and apparatuses for treating operating aluminum desmutting solutions by reacting, mixing and filtering a partial desmutting solution flow are disclosed.
Claims20
A method of treating an aluminum desmutting tank, the method comprising the steps of:
- directing at least a portion of an aluminum desmutting solution from the aluminum desmutting tank to a mixing section;
- directing an aqueous reagent solution from an aqueous reagent solution feed line to the mixing section, said aqueous reagent solution comprising an iron cyanide compound;
- contacting copper ions present in the aluminum desmutting solution with the aqueous reagent solution at the mixing section to form a precipitate, said precipitate comprising a copper-containing compound;
- filtering the precipitate to form a first filtered flow;
- and
- directing the first filtered flow to a recirculating line;
- wherein the recirculating line returns the filtered flow to the aluminum desmutting tank.
4 more elements
A method of desmutting an aluminum workpiece comprising:
- contacting the aluminum workpiece with an aluminum desmutting solution;
- directing at least a portion of an aluminum demutting solution to a mixing section during substantially continuous operation of an aluminum desmutting process;
- directing a flow of an aqueous reagent solution to the mixing section, said aqueous reagent solution comprising an iron cyanide compound;
- contacting copper ions present in the portion of the aluminum desmutting solution with the aqueous reagent solution to form a copper-containing precipitate in the mixing section;
- filtering the copper-containing precipitate to form a filtered flow;
- directing the filtered flow via a filtered flow line to a recirculating line;
- and
- maintaining a copper ion concentration in the filtered flow ranging from about 30 ppm to about 100 ppm.
5 more elements
A system for treating an aluminum desmutting solution, the system comprising:
- an aluminum desmutting solution feed line in communication with an aluminum desmutting solution reservoir, said aluminum desmutting solution feed line configured to deliver an aluminum desmutting solution from the aluminum desmutting solution reservoir to a recirculating line and an aluminum desmutting solution treatment line, said aluminum desmutting solution treatment line in communication with the recirculating line;
- an aqueous reagent solution feed line in communication with an aqueous reagent solution, said aqueous reagent solution comprising one or more of a ferricyanide;
- a ferrocyanide;
- or a
- nitroprusside, said aqueous reagent feed line further in communication with the treatment line;
- a mixing section in communication with the treatment line;
- a first filter comprising a first filter inlet and a first filter outlet, with said first filter inlet in communication with the mixing section;
- and
- a second filter comprising a second filter inlet and a second filter outlet, said second filter inlet in communication with the first filter outlet, and a second filter outlet in communication with a return line,
- said return line in communication with the aluminum desmutting solution recirculating line.
7 more elements
Dependencies are inferred from the claim text.