Recovery of phosphorus from sludge

Details Recovery of phosphorus from sludge Recovery of phosphorus from sludge

1982-08-11

1984-07-03

Spear, Jr., Frank A.

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210907, 210DIG5, B01C 1300

Patent

active

044578458

ABSTRACT:
Phosphorus is recovered from the phosphorus sludge formed in the electrothermal production of phosphorus by contacting the sludge with a hydrophobic surface with sufficient force to cause the droplets of phosphorus in the sludge to coalesce and accumulate on the surface, from which it can become detached in the form of large phosphorus drops. One such recovery process involves contacting the sludge, under hydrostatic or other pressure, with a porous membrane formed of a hydrophobic material, through which passes coalesced phosphorus from the sludge, the water and the bulk of the impurities of the sludge being restrained against passage. Other coalescing procedures involve shearing the sludge between sliding hydrophobic surfaces and passing the sludge between hydrophobic surfaces in rolling contact. Typical hydrophobic materials are polyethylene, polypropylene, and rubber.

REFERENCES:
patent: 3617548 (1971-11-01), Willihnganz
patent: 3684461 (1972-08-01), Muller et al.
patent: 4094669 (1978-06-01), Balko et al.
Redmon, D. C., "Cartridge Type Coalescers", Chemical Engineering Progress, 59, (9), pp. 87-90.

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