Liquid purification or separation – Processes – Liquid/liquid solvent or colloidal extraction or diffusing...
Patent
1992-06-08
1993-12-28
Dawson, Robert A.
Liquid purification or separation
Processes
Liquid/liquid solvent or colloidal extraction or diffusing...
2101951, 210263, 210275, 210290, 210521, 210791, 210799, 210805, B01D 1100
Patent
active
052736547
ABSTRACT:
Systems are described for removing organic solvents such as kerosene-based solvents, from aqueous solutions, in leaching processes for recovering metal such as copper from ore. A unit for recovering small amounts of kerosene-based solvent from raffinate (which comprises acidic water with a small amount of solvent and debris) includes both a plate-type coalescing device (60, FIG. 2 ) and a granular bed (62) in series, and preferably located in the same vessel (54). The raffinate first moves through the plate-type coalescing device where much of the kerosene is removed, to greatly increase the useful period of the granular bed (before it has to be backwashed). In a unit (20, FIG. 3 ) which gravity separates raffinate from metal-enhanced solvent by allowing them to flow in adjacent gravity-separated streams (116, 114), a coalescing device (120) lies along the lower stream (116) along which the raffinate moves, to coalesce solvent droplets and encourage them to rise into the upper stream (114) which is formed of metal enhanced solvent.
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Aquatechnology Resource Management
Dawson Robert A.
Fortuna Ana M.
Freilich Arthur
Hornbaker Robert D.
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