Fly ash recycle in dry scrubbing

Conference · Tue Jan 01 04:00:00 EST 1985

OSTI ID:6412818

Jozewicz, W; Rochelle, G T

Previous workers have shown that the recycle of product solids improves the utilization of slaked lime (Ca(OH)/sub 2/) for SO/sub 2/ removal by spray dryers with bag filters. In laboratory-scale experiments with a packed bed reactor, utilization was increased several-fold when the Ca(OH)/sub 2/ was first slurried with one of several different fly ashes. The enhancement increased with the higher loading of fly ash (g fly ash/g Ca(OH)/sub 2/). Much higher Ca(OH)/sub 2/ utilization was achieved when silicic acid was used instead of fly ash. Scanning electron microscopy supports the explanation that Ca(OH)/sub 2/ and silica dissolve and reprecipitate as a more reactive calcium silicate. Other major constituents of fly ash have less or no effect at all on Ca(OH)/sub 2/ utilization.

• Research Organization: Dept. of Chemical Engineering, The Univ. of Texas at Austin, Austin, TX 78712
• OSTI ID: 6412818
• Report Number(s): CONF-851123-
• Country of Publication: United States
• Language: English

Related Subjects

500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AEROSOL WASTES
AIR POLLUTION CONTROL
ALKALINE EARTH METAL COMPOUNDS
ASHES
CALCIUM COMPOUNDS
CALCIUM HYDROXIDES
CARBONATE ROCKS
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
CONTROL
DESULFURIZATION
DISPERSIONS
DISSOLUTION
DRY SCRUBBERS
ELECTRON MICROSCOPY
EQUIPMENT
FLY ASH
HYDROGEN COMPOUNDS
HYDROXIDES
INORGANIC ACIDS
LIMESTONE
MEDIUM TEMPERATURE
MICROSCOPY
MINERALS
MIXING
MIXTURES
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
QUANTITY RATIO
RECYCLING
REMOVAL
RESIDUES
ROCKS
SCANNING ELECTRON MICROSCOPY
SCRUBBERS
SCRUBBING
SEDIMENTARY ROCKS
SILICA
SILICIC ACID
SILICON COMPOUNDS
SILICON OXIDES
SLURRIES
SOLUTES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SUSPENSIONS
SYNTHESIS
WASTES