Studies of the regeneration of activated bauxite used as granular sorbent for the control of alkali vapors from hot flue gas of coal combustion
Regeneration of activated bauxite was studied by water-leaching and thermal swing (high-temperature desorption) methods. Granular activated bauxite has been identified to be very effective when used as a filter medium (i.e., sorbent) in granular-bed filters to remove gaseous alkali metal compounds from simulated hot flue gas of PFBC. Activated bauxite that had captured alkali chloride vapors was demonstrated to be easily and effectively regenerated for reuse by a simple water-leaching method. Data were obtained on (1) the leaching rate of the adsorbed NaCl, (2) effects on the leaching rate of adsorbed NaCl loading, leaching temperature, and the amount of water, and (3) water retention in activated bauxite after leaching. Observed physical changes and particle attrition of activated bauxite as a result of regeneration are discussed. The sorption mechanisms of activated bauxite toward alkali chloride vapors are interpreted on the basis of (1) the chemical compositions of the leachates from alkali chloride-sorbed activated bauxite and (2) the desorption of adsorbed NaCl vapor from activated bauxite at high temperature.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 6072571
- Report Number(s):
- ANL/CEN/FE-81-1; ON: DE81030192
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BAUXITE
REGENERATION
SORPTIVE PROPERTIES
COMBINED-CYCLE POWER PLANTS
FLUE GAS
GRANULAR BED FILTERS
HOT GAS CLEANUP
POTASSIUM CHLORIDES
SORPTION
SODIUM CHLORIDES
AIR POLLUTION CONTROL
COAL
FLUIDIZED-BED COMBUSTORS
ALKALI METAL COMPOUNDS
ALUMINIUM ORES
CARBONACEOUS MATERIALS
CHLORIDES
CHLORINE COMPOUNDS
COMBUSTORS
CONTROL
ENERGY SOURCES
FILTERS
FOSSIL FUELS
FUELS
GASEOUS WASTES
HALIDES
HALOGEN COMPOUNDS
MATERIALS
MECHANICAL FILTERS
MINERALS
ORES
POLLUTION CONTROL
POTASSIUM COMPOUNDS
POWER PLANTS
PURIFICATION
SODIUM COMPOUNDS
SURFACE PROPERTIES
THERMAL POWER PLANTS
WASTES
200202* - Fossil-Fueled Power Plants- Waste Management- Noxious Gas & Particulate Emissions
200100 - Fossil-Fueled Power Plants- Power Plants & Power Generation