Method for selective removal of cadmium

Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group iib metal

Reexamination Certificate

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C423S101000, C210S679000, C210S688000, C205S560000, C205S589000

Reexamination Certificate

active

07998441

ABSTRACT:
A method for selective removal of cadmium from a feed solution also containing other metals such as nickel (Ni) and/or cobalt (Co), utilizing a thiourea based ion exchange resin, and a method for eluting cadmium adsorbed on the thiourea based resin.

REFERENCES:
patent: 6428604 (2002-08-01), Kerfoot et al.
patent: 55-0544084 (1980-04-01), None
patent: 56-049785 (1981-05-01), None
Translation of Kobayashi et al. “Elimination of cadmium . . . ” Mizu Shori Gijutsu, 19(8), pp. 727-733,1978.
Atia et al. “Synthesis of amine and thio chelating resins and study of their interaction with zinc(II), cadmium(II) and mercury(II) ion in their aqueous solutions”, Reactive & Functional Polymers, 56(1), pp. 75-82, 2003.
Saha et al, “Sorption of trace heavy metals by thiol containing chelating resins”, Solvent Extraction and Ion Exchange, 18(1), pp. 133-167, 2000.
Zuo et al. “Selective binding of mercury to thioreau-based coordinating resins”, Reactive & Functional Polymers, vol. 27, No. 3, pp. 187-198.
Kobayashi et al. “Elimination of cadmium ion in waste water by adsorbents”, Mizu Short Gijutsu, 19(8), pp. 727-733, 1982 (with English abstract).

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