Disposal of fluidized-bed combustion ash in an underground mine to control acid mine drainage and subsidence
Conference
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OSTI ID:125391
- and others
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). Both pneumatic and hydraulic injection methods will be investigated. Success will be measured in terms of technical feasibility of the approach (i.e., percent void filling), cost, environmental benefits (acid mine drainage and subsidence control) and environmental impacts (noxious ion release). Phase I of the project is scheduled for 18 months starting in February 1994 and is concerned with the development of the grout and a series of predictive models. These models will be verified through the field phases and will allow the results to be packaged in such a way that the technology can be easily adapted to different site conditions. Phase I will also redesign a pneumatic ejector, that was developed to stow limestone, to efficiently stow FBC ash. Bench-scale testing will verify the redesign in Phase I. The 12-month Phase II is a small-scale field test at Anker Energy`s Fairfax mine. An inactive panel will be used to evaluate flow, strength, and pressure requirements for hydraulic (grout) injection. The Phase II pneumatic injection activities will take place at an Anker Energy mine in Preston County, West Virginia. Air flow requirements, pressure requirements, stowing rate (tons per hour), and stowing efficiency (distance blown) will be determined. Phase III is to take 26 months and will be a full-scale test at Anker`s 11-acre Long Ridge mine site. The mine will be filled using both pneumatic and hydraulic injection methods. It is expected that the FBC ash will replace what is now an acid mine pool with an alkaline solid so that the groundwater will tend to flow around rather than through the previously mined areas.
- Research Organization:
- West Virginia Univ., Morgantown, WV (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FC21-94MC29244
- OSTI ID:
- 125391
- Report Number(s):
- DOE/MC/29244--96/C0543; CONF-9506162--45; ON: DE96002119
- Country of Publication:
- United States
- Language:
- English
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