Leaching aluminum from calcined kaolinitic clay with nitric acid.
Olsen-RS; Gruzensky-WG; Bullard-SJ; Beyer-RP; Henry-JL
Albany, OR: U.S. Department of the Interior, Bureau of Mines, RI 8834, 1983 Jan; :1-14
Prior work by the Bureau of Mines demonstrated a feed preparation method that eliminates the formation of slime during leaching of calcined kaolinitic clay and makes leached residues fast settling and easy to filter. Nitric acid leaching rates determined for calcined kaolinitic clay prepared by this method were found to correspond to a zero-order reaction model for both batch and continuous, stirred-tank leaching. A rate constant of 0.C136 min-1 was determined. Separation of solid residues from the reacted slurry was examined, and filtration rates were determined. Permeabilities of the flocculated, leached residues were around 51 darcys, or 5.0 X 10-7 cm2 for laminar flow through 4-ft-deep beds.
Aluminum; Leaching; Materials recovery; Clays; Filtration; Nitric acid; Kaolinite; Permeability; Phosphate rock slime
IH; Report of Investigations
Albany, OR: U.S. Department of the Interior, Bureau of Mines, RI 8834