Record Display for the EPA National Library Catalog
RECORD NUMBER: 129 OF 168Main Title | Regeneration of Caustic Soda Etch Solutions for Aluminum. | |||||||||||
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Author | Brown, C. J. ; | |||||||||||
CORP Author | Environmental Protection Agency, Washington, DC. | |||||||||||
Publisher | Jun 82 | |||||||||||
Year Published | 1982 | |||||||||||
Stock Number | PB95-251062 | |||||||||||
Additional Subjects | Materials recovery ; Aluminum hydroxides ; Precipitation ; Chemical etching ; Reprints ; Alkalies ; Centrifuging ; Concentration(Composition) ; Solutions ; Byproducts ; Recycling ; SIC 3479 ; Solution regeneration | |||||||||||
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Collation | 6p | |||||||||||
Abstract | The process utilizes precipitation and centrifugation to remove Al(OH)3 from caustic aluminum solutions. When etching aluminum in a solution of caustic soda prior to anodizing, sodium aluminate (NaAl02) increases in concentration in the caustic until a rock-like precipitate of Al(OH)3 drops out of solution. By precipitating Al(OH)3 in a separate crystallization tank without the use of sequestering agents, one obtains a potentially salable byproduct (Al(OH)3) and reduces caustic consumption by recycling recovered caustic. |