Process for insolubilizing absorbed metal ions

Details Process for insolubilizing absorbed metal ions Process for insolubilizing absorbed metal ions

1993-02-16

1994-08-09

Kight, III, John

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

521 25, 521 30, 527312, 527313, 210670, 210688, 210679, 210681, 210683, 210690, 210691, 210711, 4284735, 528341, 528342, C08L 1100, C08J 520, C08G 6926, B01D 1500

Patent

active

053367049

ABSTRACT:
Metal cations absorbed within a hydrogel chelation polymer are insolubilized for safe disposal by treating the polymer with a precipitative anion such as carbonate, aluminate, hydroxide, phosphate, silicate, or sulfide. Further insolubilization of the metal cations may be achieved by subsequent treatment of the polymer with a water-dilutable prepolymer composition such as phenol-formaldehyde resin, then heating to cause cross-linking of the prepolymer. The hydrogel chelation polymer, containing metal sulfide formed by virtue of the insolubilization process, is useful in abstracting from water metals whose sulfides are less soluble than the metal sulfide initially within the polymer.

REFERENCES:
patent: 3580891 (1971-05-01), Rainer
patent: 3715339 (1973-02-01), Rainer
patent: 4332916 (1982-06-01), Thill
patent: 5002984 (1991-03-01), Rainer
patent: 5096946 (1992-03-01), Rainer
patent: 5162404 (1992-11-01), Rainer
patent: 5169883 (1992-12-01), Rainer
patent: 5187200 (1993-02-01), Rainer

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