Regeneration of Caustic Soda Etch Solutions for Aluminum
نویسنده
چکیده
A system for the regeneratlon of caustic soda solutlons used In etching aluminum Invokes the hydrolysis of sodium aluminate to llberate free sodium hydroxide and produce a dry, crystalllne hydrated alumlna byproduct. The system has been used extenslvely In Japan, and, by adjusting process parameters, can be adapted to North American practice. By otlllting the system in a typical plant, soild aiumlnum hydroxide waste can be reduced by a factor of 76 percent and caustlc soda consumption by 82 percent.
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