The potential for reclamation of dewatered aluminum-anodizing sludges as liquid alum was investigated. Batch extractions with sulfuric acid at elevated temperatures indicated that liquid alum production was feasible. Sludge solids content was shown to be a critical variable if commercial-strength products (8.0 to 8.3 percent as Al2O3) are to be produced.

Aluminum-anodizing sludge, aluminum sulfate, liquid alum, sludge reclamation and disposal, aluminum hydroxide, sulfuric-acid extraction, architectural aluminum
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