Henkel Corporation

Cognis Corporation

George A Wolfe

Michael J Virnig

Phillip L Mattison

R Brantley Sudderth

Gary Alan Kordosky

Stephen M Olafson

J Murdoch MacKenzie

J Michael Sierakoski

Keith E Weerts

Mary Collins

Rainer Eskuchen

Reuben H Grinstein

Hans Christian Hein

Sang I Kang

Horst Josten

Frank McDonnell

Ralph L Jensen

Murdoch Mackenzie

Terry L Crandell

Paul O'Driscoll

Eugen Heinrichs

Dustin Gordon

The preparation of concentrated solutions of oxime metal extractants, such as aldoximes and ketoximes, or mixtures of aldoxime and ketoxime, and the use thereof in formulating or preparing extraction reagent compositions for use in an extractant organic phase in a process of extracting metals from aqueous solutions containing metal values; and in particular, to concentrates which are solutions of individual ketoxime or aldoxime or mixtures of water-insoluble hydroxy aldoximes and ketoximes, in varying ratios by weight of 1:100 aldoxime to ketoxime, or conversely, 100:1 ketoxime to aldoxime, in water-immiscible hydrocarbon solvents or equilibrium modifiers. The invention also provides for maintaining stability of concentrates determined by accelerating rate calorimetry to define the ranges of oxime concentration and volume whereby the concentrate will be a stable, flowable, pourable and pumpable concentrate which can be safely stored long term. The extraction compositions may also optionally contain equilibrium modifiers or kinetic additives.

Concentrated solutions of oxime metal extractants and method of formulating extractant compositions therefrom

Solvent extraction process

Ketoximes, processes therefor, and copper extraction process

A process for the recovery of nickel from a nickel containing ore in which the ore, particularly a laterite ore, is initially leached with an aqueous acid solution, after which the nickel is precipitated as nickel hydroxide by adding a hydroxide to the aqueous acid leach solution containing the nickel, followed by a re-leaching of the nickel with an aqueous ammoniacal solution and recovery of the nickel by a solvent extraction of the nickel from the aqueous ammoniacal solution with an organic phase of a water insoluble oxime extractant comprising a ketoxime containing less than 10% phenols dissolved in a water-immiscible hydrocarbon solvent and the nickel recovered by electrowinning the nickel from the aqueous acid stripping solution employed to strip the nickel from the organic phase.

Nickel recovery process and compositions for use therein

Process of recovery of metals from aqueous ammoniacal solutions employing an ammonia antagonist having only hydrogen bond acceptor properties

Process for extracting and recovering copper

Toxic cyanide and anionic metal species are removed from aqueous alkaline solutions by contacting the aqueous alkaline solutions with an extractant compound which is capable of being protonated at a pH of 9 or above. Whereby the anionic metal species is extracted from the aqueous alkaline solution, subsequently stripping the metal values from the extractant and recovering the metal species, preferably by electrowinning. The process is useful in a flotation process in which a recycled aqueous process stream is employed in that the toxic cyanide ion and anionic metal species are removed prior to recycling of the aqueous process stream for flotation.

Process for the removal of toxic cyanide and heavy metal species from

Toxic cyanide and anionic metal species are removed from aqueous alkaline solutions by contacting the aqueous alkaline solutions with a compound which is capable of being protonated at a pH of 9 or above.

Growing community of inventors

Tucson, AZ, United States of America

George A Wolfe