Disposal of Fluidized Bed Combustion Ash in an Underground Mine to Control Acid Drainage and Subsidence. Quarterly report, June 1 - August 31, 1997 Page: 4 of 114
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for the Period of
June 1, 1997 to August 31, 1997
Phase III, Quarter II
Project - ETD05 "Disposal of Fluidized Bed Combustion Ash in an Underground
Mine to Control Acid Mine Drainage and Subsidence
DE-FC21-94MC29244 - y-
This project will evaluate the technical, economic and environmental feasibility of
filling abandoned underground mine voids with alkaline, advanced coal combustion
wastes (Fluidized Bed Combustion - FBC ash). Success will be measured in terms of
technical feasibility of the approach (i.e. % void filling), cost, environmental impacts
(noxious ion release).
Phase I on the project was completed in September 1995 and was concerned with
the development of the grout and a series of predictive models. These models were
verified through the Phase II field phase and will be further verified in the large scale
field demonstration of Phase III. The verification will allow the results to be packaged in
such a way that the technology can be easily adapted to different site conditions. Phase II
was successfully completed with 1000 cubic yards of grout being injected into Anker
Energy's Fairfax mine. The grout flowed over 600 feet from a single injection borehole.
The grout achieved a compressive strength of over 100 psi (twice the level that is needed
to guarantee subsidence control). Phase III is to take 26 months and will be a full scale
test at Anker's eleven acre Longridge mine site.
It is expected that the FBC ash will replace what is now an acid mine pool with
alkaline solid so that the groundwater will tend to flow around and through the pillars
rather than through the previously mined areas. The project has demonstrated that FBC
ash can be successfully disposed in underground mines. Additionally, the project is
directed towards showing that such disposal can lead to reduction or elimination of
environmental problems associated with underground mining such as acid mine drainage
During Phase III the majority of the activity involves completing two full scale
demonstration projects. The eleven acre Longridge mine in Preston County will be filled
with 53,000 cubic yards of grout during the spring of 1998 and monitored for the
following year. The second demonstration involves stowing 2000 tons of ash into an
abandoned mine to demonstrate the newly designed Burnett Ejector. This
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Disposal of Fluidized Bed Combustion Ash in an Underground Mine to Control Acid Drainage and Subsidence. Quarterly report, June 1 - August 31, 1997, report, August 31, 1997; United States. (digital.library.unt.edu/ark:/67531/metadc689032/m1/4/: accessed January 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.