Mineralogy and Trace Element Partitioning in Coal Fly Ash/Acid Mine Drainage Co-Disposed Solid Residues

摘要

Acid mine drainage (AMD) was reacted with coal fly ash in a 24 hour equilibration time using 3:1 and 1.5:1 AMD: FA ratios by weight to produce neutral and alkaline process waters and remove major and minor elements from solution. The elemental concentration trends with time in the solution were used to discern which elements have solubility control in the neutralization process. The resulting co-disposal solid have been characterized using dissolution techniques coupled with differential x-ray diffraction in an attempt to detect the minerals precipitating out during the process. The trace elements extracted in the dissolution process were correlated with the total extractable Fe, Mn and Al in an attempt to establish any significant association. SEM and SEM-EDS have been used to detect the morphological changes of the solid residue particles on extraction.