Dissolution and recovery of aluminum and other metals from Calsinter process sinter product
In the Calsinter process for the recovery of aluminum and other metals, fly ash is sintered with a source of calcium oxide at 1000 to 1200/sup 0/C, and the sinter product leached with dilute sulfuric acid. The leach step parameters have been optimized following a sinter of eastern Tennessee fly ash with limestone. Batch rate studies have shown that near maximum aluminum solubilization was achieved in 1 h at ambient temperature with 4N H/sub 2/SO/sub 4/ at 20% pulp density. A three-stage batch countercurrent leach system was operated under steady-state conditions in which only 2.2 moles of H/sub 2/SO/sub 4/ were required per mole of Al/sub 2/O/sub 3/ solubilized. Solubilization of aluminum (97%), iron (97%), titanium (82%), and a number of trace metals was obtained. Solvent extraction, employing a primary amine, removed 100% of the iron and 95% of several other metals present in significant concentration from the leach solution and rejected >90% of the aluminum. A cursory examination of the crystallization of ammonium alum from the solvent extraction raffinate showed product decontamination, with respect to Fe/sub 2/O/sub 3/, K/sub 2/O, MnO/sub 2/, and P/sub 2/O/sub 5/, to be excellent. Concentrations of CaO and Na/sub 2/O, however, were above specification limits.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 5538325
- Report Number(s):
- CONF-810203-20; ON: DE83015512
- Resource Relation:
- Conference: AIME annual meeting, Chicago, IL, USA, 22 Feb 1981
- Country of Publication:
- United States
- Language:
- English
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Chemical development of the Calsinter process for recovering resource materials from fly ash
Chemical development of the Calsinter process for recovering resource materials from fly ash
Related Subjects
ALUMINIUM
MATERIALS RECOVERY
FLY ASH
AQUEOUS SOLUTIONS
DISSOLUTION
LEACHING
SOLVENT EXTRACTION
SULFURIC ACID
AEROSOL WASTES
ASHES
DISPERSIONS
ELEMENTS
EXTRACTION
HYDROGEN COMPOUNDS
INORGANIC ACIDS
MANAGEMENT
METALS
MIXTURES
PROCESSING
RECOVERY
RESIDUES
SEPARATION PROCESSES
SOLUTIONS
WASTE MANAGEMENT
WASTE PROCESSING
WASTES
320305* - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Industrial Waste Management