# US 4,382,016 A · Extractant for the selective removal of cobalt(II) from aqueous solutions

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- Number: US 4,382,016 A
- Document ID: US4382016A
- Status: Granted
- Kind: A
- Application number: 06/391,270
- Filed: 1982-06-23
- Granted: 1983-05-03
- Earliest claimed: 1980-08-28
- Assignees: American Cyanamid Company
- Inventors: William A. Rickelton; Allan J. Robertson; David R. Burley
- Web page: https://patentgrep.com/patent/US4382016A

## CPC

- C01G 51/01: Preparation or separation involving a liquid-liquid extraction, an adsorption or an ion-exchange
- C22B 3/24: by adsorption on solid substances, e.g. by extraction with solid resins
- C22B 3/3842: {Phosphinic acid, e.g. H2P(O)(OH)}
- Y02P 10/20: Recycling
- C01G: COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts or peroxyacids C01B15/00; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium, or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds containing nitrogen, other non-metals and metal C01B21/082}; metal amides C01B21/092; nitrites C01B21/50; {compounds of noble gases C01B23/0005}; phosphides C01B25/08; salts of oxyacids of phosphorus C01B25/16; carbides C01B32/90; compounds containing silicon C01B33/00; compounds containing boron C01B35/00; compounds having molecular sieve properties but not having base-exchange properties C01B37/00; compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites, C01B39/00; cyanides C01C3/08; salts of cyanamide C01C3/16; thiocyanates C01C3/20)
- C22B: PRODUCTION AND REFINING OF METALS (electrolytic C25); PRETREATMENT OF RAW MATERIALS
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

Cobalt(II)-bearing aqueous solutions may be treated with an extractant comprising an organic-soluble phophinic acid, or a salt thereof, to separate the cobalt(II) from the aqueous solution. Typical extraction techniques compatible with the instant process include liquid-liquid extraction employing either mixer settlers or columns, packed beds of supported extractants as in ion exchange, liquid membrane extraction and selective supported membrane extraction.

## Claims

### Claim 1

A composition for use in extraction comprising an inert material whereupon an organophosphinic acid of the structure: ##STR4## is adsorbed entrained or chemically bound wherein R.sub.1, R.sub.2 are individually substituted or unsubstituted alkyl, cycloalkyl, alkoxyalkyl, alkylcycloalkyl, aryl, alkylaryl, aralkyl or cycloalkylaryl radicals and X is either hydrogen or a salt-forming radical.

### Claim 2 (depends on 1)

The composition of claim 1 wherein the inert material is diatomaceous earth.

### Claim 3 (depends on 1)

The composition of claim 1 wherein the inert material is a polystyrene bead.