Leaching coal combustion by-products with acidic, basic and neutral liquids
- Dept. of Energy, Pittsburgh, PA (United States). Pittsburgh Research Center
This year about 100 million tons of combustion by-products will be generated by US coal burning power plants. When coal combustion by-products are placed in inactive surface or underground mines, they may react with naturally occurring fluids such as rain, groundwater, and acid mine drainage. The Pittsburgh Research Center of the United States Department of Energy (DOE) is investigating the reactions of power plant fly ash samples with various lixiviants in a series of column leaching tests. Seven 1-kg samples of each flyash are placed in individual 5-cm diameter by 1-m long acrylic columns. The columns are leached at a nominal rate of 250 mL/day for 30 to 60 days with seven different lixiviants. Lixiviants include deionized water, artificial ground water, synthetic precipitation, and dilute solutions of acetic acid, ferric chloride, sulfuric acid, and a common base. The leachate is analyzed for pH, acidity or alkalinity, iron, calcium, aluminum, manganese, magnesium and trace metals. Column leaching tests have been completed on 17 different fly ash samples, and are in progress on another set of four samples. The results of some completed column leaching tests are graphed and analyzed.
- OSTI ID:
- 549537
- Report Number(s):
- CONF-960954--
- Country of Publication:
- United States
- Language:
- English
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