Inventors:
John W. College - Pittsburgh PA
Bryan R. Beyer - McMurray PA
Robert Mark Golightley - Cuyahoga Falls OH
Assignee:
Eastroc LLC - Shippingport PA
International Classification:
C01F 1146
C01F 100
Abstract:
A method of purifying a flue gas desulfurization aqueous waste slurry containing calcium-sulfur salts and residual solid grits, fly ash, carbon and oils by supplying the aqueous waste slurry to a screening station to remove the grits, passing the grit-free aqueous waste slurry to a magnetic separator to remove fly ash components, and transferring the aqueous slurry to a floatation cell to remove carbon and oils therefrom. A purified aqueous slurry of calcium-sulfur salts is removed from the floatation cell which can be used in producing quality plaster, wallboard, or feedstock in producing. alpha. -hemihydrate gypsum.