Mineralogy and Trace Element Partitioning in CoalFly Ash/Acid Mine Drainage Co-Disposed SolidResidues

摘要

Acid mine drainage (AMD) was reacted with coal fly ash in a 24 hour equilibration time usingrn3:1 and 1.5:1 AMD: FA ratios by weight to produce neutral and alkaline process waters andrnremove major and minor elements from solution. The elemental concentration trends with timernin the solution were used to discern which elements have solubility control in the neutralizationrnprocess. The resulting co-disposal solid have been characterized using dissolution techniquesrncoupled with differential x-ray diffraction in an attempt to detect the minerals precipitating outrnduring the process. The trace elements extracted in the dissolution process were correlated withrnthe total extractable Fe, Mn and Al in an attempt to establish any significant association. SEMrnand SEM-EDS have been used to detect the morphological changes of the solid residue particlesrnon extraction.