Separation of Flue-Gas Scrubber Sludge into Marketable Products
The reduction of sulfur oxides from high sulfur coal burning utility companies has resulted in the production of huge quantities of wet flue-gas desulfurization scrubber sludge. A typical 400 MW power station burning a coal containing 3.5% sulfur by weight and using a limestone absorbent would produce approximately 177,000 tons (dry weight) of scrubber sludge per year. This brownish colored, finely divided material contains calcium sulfite (CaSO{sub 3} {center_dot} 1/2 H{sub 2}O), calcium sulfate (CaSO{sub 4} {center_dot} 2H{sub 2}O), unreacted limestone (CaCO{sub 3}), and various other impurities such as fly-ash and iron oxide particles. The physical separation of the components of scrubber sludge would result in the re-use of this material. The primary use would be conversion to a highly pure synthetic gypsum. This technical report concentrates on the effect of baffle configuration on the separation of calcium sulfite/sulfate from limestone. The position of the baffles as they related to the feed inlet, and the quantity of the baffles were examined. A clean calcium sulfite/sulfate (less than 2.0% limestone by weight) was achieved with the combination of water-only cyclone and horizontally baffled column.
- Research Organization:
- Michigan Technological Univ., Houghton, MI (US)
- Sponsoring Organization:
- USDOE Assistant Secretary for Fossil Energy, Washington, DC (US)
- DOE Contract Number:
- FG22-93PC93214
- OSTI ID:
- 16801
- Report Number(s):
- DOE/PC/93214-14; ON: DE98058874; TRN: US200504%%378
- Resource Relation:
- Other Information: Supercedes report DE98058874; PBD: 28 Feb 1998
- Country of Publication:
- United States
- Language:
- English
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Separation of flue-gas scrubber sludge into marketable products. Third year, first quarterly technical progress report Quarter No. 9, September 1, 1995--November 30, 1995
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