INJECTION OF FGD GROUT TO ABATE ACID MINE DRAINAGE IN UNDERGROUND COAL MINES

摘要

The objective of this project is to demonstrate the technical feasibility of injecting cementitious alkaline materials in the form of fixated flue gas desulfurization (FGD) material to reduce and mitigate acid mine drainage in a small abandoned deep mine in Coshocton County, Ohio. The project will attempt to demonstrate if a grout consisting of FGD and water can economically seal off seepage from old mine works and reduce or eliminate acid mine drainage. By attempting to seal and fill primarily the lower, down-dip areas of the mine, we will attempt to establish a practical procedure which can be economically applied to larger mines where full scale filling would be cost prohibitive due to the quantities required. In addition to the design of the grout mix and the mine seal, the research project will be studying the following aspects of the use of FGD in this application:rn1. Impact of FGD on ground and surface water qualityrn2. Effect of AMD chemistry on acid neutralizing capacity of FGDrn3. Weathering Kinetics of FGD grout subject to AMD conditionsrn4. Effect on physical properties of FGD caused by AMD weatheringrn5. Sulfur Isotopic Characterization of the site coal, FGD, acid mine water, and groundwater samples.