Method and apparatus for regeneration of extraction solution in metal extraction processes
AssigneeOutotec (Finland) Oy
InventorsErkki Paatero, Kai Jyrkkä, Sami Virolainen
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Abstract
A method and apparatus for restoring the extractive potential of organic hydroxyoxime-based extraction solution used in the recovery of metals by liquid-liquid extraction are provided. The method is two-stage, in which an aqueous solution of hydroxylamine or some hydroxylamine compound is used in the reaction stage, and the removal of the undesirable compounds generated in the reaction occurs in the second stage by adsorption purification. The reaction stage and the adsorptive stage are carried out in a mixing tank.
Claims8
An apparatus for treating organic extraction solution used in liquid-liquid extraction, where the extraction reagent of the solution is hydroxyoxime-based and where the metal extraction properties of said solution have been changed chemically in the process conditions, wherein in order to restore the physical and metal extraction properties of the extraction solution said solution is treated in two stages, whereby in the first of which, the reaction stage, the mixing of the extraction solution to be reoximated and an aqueous solution of hydroxylamine or a compound thereof, takes place in a mixing tank, which is equipped with a spiral-shaped mixer, after which the solutions are separated from each other and the extraction solution is treated in an adsorption purification stage mixing tank, in which the mixing of the extraction solution and some adsorption material in solid form is carried out with a spiral-shaped mixer.
Dependencies are inferred from the claim text.