Electrodialysis technology for salt recovery from aluminum salt cake
Electrodialysis technology for recovering salt from aluminum salt cake is being developed at Argonne National Laboratory. Salt cake, a slag-like aluminum-industry waste stream, contains aluminum metal, salt (NaCl and KCl), and nonmetallics (primarily aluminum oxide). Salt cake can be recycled by digesting with water and filtering to recover the metal and oxide values. A major obstacle to widespread salt cake recycling is the cost of recovering salt from the process brine. Electrodialysis technology developed at Argonne appears to be a cost-effective approach to handling the salt brines, compared to evaporation or disposal. In Argonne's technology, the salt brine is concentrated until salt crystals are precipitated in the electrodialysis stack; the crystals are recovered downstream. The technology is being evaluated on the pilot scale using Eurodia's EUR 40-76-5 stack.
- Research Organization:
- Argonne National Laboratory, Argonne, IL (US)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 751894
- Report Number(s):
- ANL/ES/CP-100979; TRN: AH200018%%122
- Resource Relation:
- Conference: 17th Annual Membrane Technologies/Separations Planning Conference, Newton, MA (US), 12/06/1999--12/07/1999; Other Information: PBD: 2 Feb 2000
- Country of Publication:
- United States
- Language:
- English
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