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Title: Experimental processing of salt slags from an aluminum dross furnace

The Federal Bureau of Mines has developed a hydrometallurgical method to recover aluminum, aluminum oxide, and fluxing salts from aluminum salt slags. The slag is leached with water at room temperature to produce a saturated brine slurry. Screening of the slurry yields an aluminum-rich fraction that can be returned to the dross furnace. The remaining slurry is vacuum filtered, yielding a clear brine solution and an aluminum oxide filter cake. Evaporation of the clear filtrate produces a high-purity fluxing salt for reuse in the dross furnace. Over 80 pct of the metallic aluminum is recovered in the aluminum-rich oversize fraction, while essentially all the fluxing salts are recovered by evaporation. This report contains the final results of an investigation on a process research unit scale, an economic evaluation of the method, and recommendations to further improve the process.
Authors:
; ;
Publication Date:
OSTI Identifier:
5029178
Report Number(s):
BM-RI-8446
Resource Type:
Technical Report
Research Org:
Bureau of Mines, Washington, DC (USA)
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; ALUMINIUM; MATERIALS RECOVERY; ALUMINIUM OXIDES; INDUSTRIAL WASTES; RECYCLING; SALTS; SLAGS; FURNACES; MELTING; METAL INDUSTRY; WASTE PROCESSING; ALUMINIUM COMPOUNDS; CHALCOGENIDES; ELEMENTS; INDUSTRY; MANAGEMENT; METALS; OXIDES; OXYGEN COMPOUNDS; PHASE TRANSFORMATIONS; PROCESSING; RECOVERY; WASTE MANAGEMENT; WASTES 320305* -- Energy Conservation, Consumption, & Utilization-- Industrial & Agricultural Processes-- Industrial Waste Management