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Evaluation of a Method Using Colloidal Gas Aphrons to Remediate Metals-Contaminated Mine Drainage Waters.

DE2004822153

Publication Date	2002
Personal Author	Grimes, R. W.
Page Count	42
Abstract	Experiments were conducted in which three selected metals-contaminated mine drainage water samples were treated by chemical precipitation followed by flotation using colloidal gas aphrons (CGAs) to concentrate the precipitates. Drainage water samples used in the experiments were collected from an abandoned turn-of-the-century copper mine in south-central Wyoming, an inactive gold mine in Colorado's historic Clear Creek mining district, and a relatively modern gold mine near Rapid City, South Dakota. The copper mine drainage sample was nearly neutral (pH 6.5) while the two gold mine samples were quite acidic (pH(approx)2.5). Metals concentrations ranged from a few mg/L for the copper mine drainage to several thousand mg/L for the sample from South Dakota. CGAs are emulsions of micrometer-sized soap bubbles generated in a surfactant solution. In flotation processes the CGA microbubbles provide a huge interfacial surface area and cause minimal turbulence as they rise through the liquid. CGA flotation can provide an inexpensive alternative to dissolved air flotation (DAF).
Keywords	Colloids Demetallization Waste water Water pollution control Evaluations Methods Copper Gold Mining Emulsions Water treatment Flotation Precipitation Concentration Precipitates Colloidal gas aphrons Mine drainage water
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	University of Wyoming Research Corp., Laramie. Western Research Inst.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200507

Evaluation of a Method Using Colloidal Gas Aphrons to Remediate Metals-Contaminated Mine Drainage Waters.

Evaluation of a Method Using Colloidal Gas Aphrons to Remediate Metals-Contaminated Mine Drainage Waters.
DE2004822153

Publication Date	2002
Personal Author	Grimes, R. W.
Page Count	42
Abstract	Experiments were conducted in which three selected metals-contaminated mine drainage water samples were treated by chemical precipitation followed by flotation using colloidal gas aphrons (CGAs) to concentrate the precipitates. Drainage water samples used in the experiments were collected from an abandoned turn-of-the-century copper mine in south-central Wyoming, an inactive gold mine in Colorado's historic Clear Creek mining district, and a relatively modern gold mine near Rapid City, South Dakota. The copper mine drainage sample was nearly neutral (pH 6.5) while the two gold mine samples were quite acidic (pH(approx)2.5). Metals concentrations ranged from a few mg/L for the copper mine drainage to several thousand mg/L for the sample from South Dakota. CGAs are emulsions of micrometer-sized soap bubbles generated in a surfactant solution. In flotation processes the CGA microbubbles provide a huge interfacial surface area and cause minimal turbulence as they rise through the liquid. CGA flotation can provide an inexpensive alternative to dissolved air flotation (DAF).
Keywords	Colloids Demetallization Waste water Water pollution control Evaluations Methods Copper Gold Mining Emulsions Water treatment Flotation Precipitation Concentration Precipitates Colloidal gas aphrons Mine drainage water
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	University of Wyoming Research Corp., Laramie. Western Research Inst.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200507