Record Display for the EPA National Library Catalog

RECORD NUMBER: 157 OF 209

OLS Field Name OLS Field Data
Main Title Regeneration of Caustic Soda Etch Solutions for Aluminum.
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
Holdings
Library Call Number Additional Info Location Last
Modified
Checkout
Status
NTIS  PB95-251062 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 11/25/1995
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.