Underground Coal Gasification Contaminant Control Program: Laboratory Analysis of Samples from the Tono I UCG Cavity - Materials Characterization and Environmental Implications. Topical Report November 86-June 87

摘要

The major issue addressed in the report is the relationship between cavity material characteristics and groundwater impacts. Samples from the Tono excavation cavity were characterized by various analytical methods. Results indicate the unaltered coal mineralogy consisted of quartz, clay minerals, and feldspars, with some calcite, pyrite, gypsum, and zeolite. Of the altered material, char exhibited a similar mineralogy with a slight increase in gypsum, a loss of pyrite, and the appearance of some higher-temperature minerals. Data suggest that most groundwater contamination generated by leaching in a UCG cavity will be derived from char and the altered clay, carbonate, and sulfurous minerals contained within the char.