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Leaching Pyrite from Coal Waste: Results of Diagnostic Study.

PB96107073

Publication Date	1995
Personal Author	Chaiken, R. F.; Dalverny, L. E.
Page Count	50
Abstract	A methodology for studing coupled chemical kinetic and mass transport processes during leaching of solids is described, with particular emphasis given to the leaching of pyrite from coal in a counterflow 'trickle-bed' column reactor. Spatial and temporal data on reactant and product concentrations are used as solutions to appropriate continuity equations which in turn are to define chemical kinetic reaction rates. Data from four 180 x 30-cm column leaching experiments using coal and coal waste, air/water and air/FeCL3 lixiviants have been analyzed. The overall rate of leaching was found to be diffusion limited (probably by ferric ion) and not controlled by bacterial action. An absorption/description model of solids leaching, which considers the role of heterogeneous porosity in solids leaching, was used to describe the time dependent leaching rates.
Keywords	Pyrite Leaching Coal Chemical reaction kinetics Mine wastes Spoil Mine waters Iron oxides Oxidation Mass transport Chemical reactivity Separation processes Chemical analysis Trickling filtration Acid mine drainage Graphs(Charts)
Source Agency	Bureau of Mines
NTIS Subject Category	48A - Mineral Industries 68D - Water Pollution & Control 99F - Physical & Theoretical Chemistry
Corporate Authors	Bureau of Mines, Pittsburgh, PA. Pittsburgh Research Center.
Document Type	Technical Report
Title Note	Rept. of investigations/1995.
NTIS Issue Number	199601

Leaching Pyrite from Coal Waste: Results of Diagnostic Study.

Leaching Pyrite from Coal Waste: Results of Diagnostic Study.
PB96107073

Publication Date	1995
Personal Author	Chaiken, R. F.; Dalverny, L. E.
Page Count	50
Abstract	A methodology for studing coupled chemical kinetic and mass transport processes during leaching of solids is described, with particular emphasis given to the leaching of pyrite from coal in a counterflow 'trickle-bed' column reactor. Spatial and temporal data on reactant and product concentrations are used as solutions to appropriate continuity equations which in turn are to define chemical kinetic reaction rates. Data from four 180 x 30-cm column leaching experiments using coal and coal waste, air/water and air/FeCL3 lixiviants have been analyzed. The overall rate of leaching was found to be diffusion limited (probably by ferric ion) and not controlled by bacterial action. An absorption/description model of solids leaching, which considers the role of heterogeneous porosity in solids leaching, was used to describe the time dependent leaching rates.
Keywords	Pyrite Leaching Coal Chemical reaction kinetics Mine wastes Spoil Mine waters Iron oxides Oxidation Mass transport Chemical reactivity Separation processes Chemical analysis Trickling filtration Acid mine drainage Graphs(Charts)
Source Agency	Bureau of Mines
NTIS Subject Category	48A - Mineral Industries 68D - Water Pollution & Control 99F - Physical & Theoretical Chemistry
Corporate Authors	Bureau of Mines, Pittsburgh, PA. Pittsburgh Research Center.
Document Type	Technical Report
Title Note	Rept. of investigations/1995.
NTIS Issue Number	199601