Characterization of Rare Earth Element Minerals in Coal Utilization Byproducts and Associated Clay Deposits from Appalachian Basin Coal Resources

摘要

Authigenicand diagenetic REE bearing minerals (e.g., apatite, crandallite, monazite, xenotime) are present in matrix phyllosilicates in roof rock, coal refuse samples, and underclay.rn1. REE trends and Srare indicative of diagenesis and formation of Ca-P and carbonate mineral zones.rnThe presence of crystalline monazite and xenotimeis a significant discovery showing that combustion has a limited impact on these phosphates.rn1. Isolated in the ash matrixrn2. Encapsulatedrn3. Fused by secondary phases in CUB samples.rnFIB-SEM analysis yields ability to analyze and quantify the volume of REE mineral grains in a complex matrix.