Separation of flue-gas scrubber sludge into marketable products. Second year, fourth quarterly technical progress report, Quarter No. 8, June 1, 1995--August 31, 1995

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To reduce their sulfur emissions, many coal-fired electric power plants use wet flue-gas scrubbers. These scrubbers convert sulfur oxides into solid sulfate and sulfite sludge, which must then be disposed of. This sludge is a result of reacting limestone with sulfur dioxide to precipitate calcium sulfite and calcium sulfate. It consists of calcium sulfite (CaSO{sub 3}{sm_bullet}0.5H{sub 2}O), gypsum (CaSO{sub 4}{sm_bullet}2H{sub 2}O), and unreacted limestone (CaCO{sub 3}) or lime (Ca(OH){sub 2}), with miscellaneous objectionable impurities such as iron oxides, silica, and magnesium, sodium, and potassium oxides or salts. These impurities prevent many sludges from being utilized as a replacement for natural ... continued below

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10 p.

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Kawatra, S.K. & Eisele, T.C. September 1, 1995.

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Description

To reduce their sulfur emissions, many coal-fired electric power plants use wet flue-gas scrubbers. These scrubbers convert sulfur oxides into solid sulfate and sulfite sludge, which must then be disposed of. This sludge is a result of reacting limestone with sulfur dioxide to precipitate calcium sulfite and calcium sulfate. It consists of calcium sulfite (CaSO{sub 3}{sm_bullet}0.5H{sub 2}O), gypsum (CaSO{sub 4}{sm_bullet}2H{sub 2}O), and unreacted limestone (CaCO{sub 3}) or lime (Ca(OH){sub 2}), with miscellaneous objectionable impurities such as iron oxides, silica, and magnesium, sodium, and potassium oxides or salts. These impurities prevent many sludges from being utilized as a replacement for natural gypsum, and as a result they must be disposed of in landfills, which presents a serious disposal problem. Knowledge of scrubber sludge characteristics is necessary for the development of purification technologies which will make it possible to directly utilize scrubber sludges rather than landfilling them. This project is studying the use of minimal-reagent froth flotation as the purification process, using the surface properties of the particles of unreacted limestone to remove them and their associated impurities from the material, leaving a purified calcium sulfite/gypsum product.

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10 p.

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OSTI as DE96009276

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  • Other Information: PBD: Sep 1995

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  • Other: DE96009276
  • Report No.: DOE/PC/93214--T9
  • Grant Number: FG22-93PC93214
  • DOI: 10.2172/224287 | External Link
  • Office of Scientific & Technical Information Report Number: 224287
  • Archival Resource Key: ark:/67531/metadc670876

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Office of Scientific & Technical Information Technical Reports

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  • September 1, 1995

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • Nov. 25, 2015, 2:06 p.m.

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Kawatra, S.K. & Eisele, T.C. Separation of flue-gas scrubber sludge into marketable products. Second year, fourth quarterly technical progress report, Quarter No. 8, June 1, 1995--August 31, 1995, report, September 1, 1995; United States. (digital.library.unt.edu/ark:/67531/metadc670876/: accessed November 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.