Imperial Chemical Industries Limited

Zeneca Limited

Raymond F Dalton

Peter M Quan

John Campbell

John L Leng

David Stewart

Raymond Price

Derek Thorp

Brian Anderson

Philip Martin Rowbotham

Arthur Burgess

A composition for use in extracting metals from aqueous solutions of metals salts comprises at least one o-hydroxyaryloxime containing at least 5 aliphatic or alicyclic carbon atoms and at least one ester containing from 10 to 30 carbon atoms, the weight ratio of o-hydroxyaryloximes to the esters being in the range of 10:1 to 1:3. A process for extracting metal from aqueous solutions using the composition is also disclosed.

Composition and use of composition for the extraction of metal values

A composition for use in extracting copper values from aqueous solutions of metal salts comprises one or more o-hydroxyaryloximes containing at least 5 aliphatic or alicyclic carbon atoms which are strong metal extractants which, in 0.2 molar solution in an aliphatic hydrocarbon solution when loaded with 50% of the theoretical uptake of copper, will be in equilibrium with a 0.1 molar solution of copper as copper perchlorate at a pH less than 1 and one or more branched chain aliphatic or aliphatic-aromatic esters containing 10 to 30 carbon atoms, wherein the ratio of the number of methyl carbon atoms to the number of non-methyl carbon atoms is higher 1:5 and the weight ratio of A to B being in the range of 10:1 to 1:3.

Composition and use of the composition for the extraction of metals from

A process for extracting metal values, especially zinc values, from aqueous solutions of metal salts, which comprises contacting the aqueous solution with an organic phase comprising a compound of the formula, ##STR1## wherein each of R.sup.1, R.sup.2, R.sup.3 and R.sup.4, independently, represents an optionally substituted hydrocarbyl or hydrocarbyloxy group or R.sup.1 and R.sup.2 together with the attached phosphorus atom and/or R.sup.3 and R.sup.4 together with the attached phosphorus atom from a 5- to 8-membered heterocyclic ring.

Chemical process

A process for extracting metal values especially zinc values from aqueous solutions of metal salts which comprises contacting the aqueous solution with an organic phase comprising a compound of the formula: ##STR1## wherein each of R.sup.1, R.sup.2, R.sup.3 and R.sup.4, independently, represents an optionally substituted hydrocarbyl or hydrocarbyloxy group or R.sup.1 and R.sup.2 together with the attached phosphorus atom and/or R.sup.3 and R.sup.4 together with the attached phosphorus atom form a 5- to 8-membered heterocyclic ring.

Alkylphenoxy substituted bis (thio phosphoryl) amines

Bis(dialkylthiophosphoryl)amines as metal extractants

Metal values (especially uranium values) are extracted from aqueous solutions of metal oxyions in the absence of halogen ion using an imidazole of defined formula. Especially preferred extractants are 1-alkyl imidazoles and benzimidazoles having from 7 to 25 carbon atoms in the alkyl group.

Process for the recovery of metals

Process for extracting metal values from aqueous solution

A process for extracting metal values especially zinc values from aqueous solutions of metal salts which comprises contacting the aqueous solution with an organic phase comprising a compound of the formula: ##STR1## wherein each of R.sup.1, R.sup.2, R.sup.3 and R.sup.4, independently, represents a substituted hydrocarbyl or hydrocarbyloxy group or R.sup.1 and R.sup.2 together with the attached phosphorus atom and/or R.sup.3 and R.sup.4 together with the attached phosphorus atom form a 5- to 8-membered heterocyclic ring.

Process for extracting metals

A metal extractant for extracting metals from aqueous solutions of metal salts comprising at least one o-hydroxyaryloxime and one or more aliphatic or aromatic-alicyclic alcohols.

A composition of bibenzimidazoles of the Formula (I): ##STR1## wherein X & Y which may be the same or different and, taken together, contain a total of from 12 to 52 saturated carbon atoms, are (a) each selected from --R, --COR, --CH.sub.2 COOR, --CH(COOR).sub.2 and --COOR; or (b) together form a group selected from ##STR2## wherein R is an optionally substituted hydrocarbyl group,

Bis-bibenzimidazole composition

A composition for use in extracting copper values from aqueous solutions of metal salts which comprises:

A composition for use in extracting copper values from aqeous solutions of metal salts which comprises one more o-hydroxyaryloximes containing at least 5 aliphatic or alicyclic carbon atoms which are strong metal extractants which, in 0.2 molar solution in an aliphatic hydrocarbon solution loaded with 50% of the theoreticl uptake of copper, will be in equilibrium with 0.1 molar solution of copper as copper perchlorate at a pH less than 1; and one or more branched chain aliphatic or aromatic-aliphatic alcohols containing 14 to 30 carbon atoms or aliphatic or aliphatic-aromatic esters containing 10 to 30 carbon atoms, wherein the ratio of the number of methyl carbon atoms to the number of non-methyl carbon atoms is higher than 1:5, and which is selected from the group consisting of highly branched isohexadecyl alcohol, highly branched isooctadecyl alcohol and a diester of 2,2,4-trimethyl-1,3-pentanediol; and wherein the weight ratio of A to B is in the range 10:1 to 1:3.

An aqueous solution containing palladium is contacted with a solution of a heterocyclic ring compound having at least one ring substituent of the type --COX, which is, or contains, a hydrocarbyl group having at least 5 carbon atoms. The heterocyclic ring compound may be a pyridine mono-, di- or tri-carboxylic acid ester, for example the bis-isodecyl ester of pyridine- 3,5-dicarboxylic acid. Other heterocyclic ring compounds include those having a pyrimidine, pyrazine, pyridazine, 1,2,4-triazole or imidazole ring. Palladium is extracted into the water-immiscible solution while other metals, particularly platinum group metals, remain in the aqueous solution. The palladium can be stripped from the water-immiscible solution for example using a dilute aqueous solution of ammonia.

Solvent extraction process

Metal values are extracted from aqueous solutions of metal salts containing halide or pseudo halide ions by pyridine derivatives containing the substituent --(COX).sub.A where X is the group --OR.sub.1 or --NH.sub.2 R.sub.3 and n is 1, 2 or 3. R.sub.1 is a hydrocarbyl group containing from 5 to 36 carbon atoms and R.sub.2 and R.sub.3 are hydrogen or a hydrocarbyl group wherein R.sub.2 and R.sub.3 together contain from 5 to 36 carbon atoms. The process is especially useful for the recovery of metals from leach solutions derived from sulphur-containing ores such as chalcopyrite.

Growing community of inventors

Cheadle Hulme, United Kingdom

Raymond F Dalton