Outokumpu Oyj

Norilsk Nickel Finland Oy

Northvolt Ab

Norilsk Nickel Harjavalta Oy

Metal Trade Overseas Ag

Esa Lindell

Launo L Lilja

Bror G Nyman

Stig-Erik Hultholm

Eero Ekman

Juhani Lyyra

Raimo Kuusisto

Pertti Pekkala

Rauno Luoma

Arja Oja

Tom Niemi

Cornelia Lantto

Sergey Kotukhov

Tuomo Laukkanen

Pekka Tynjälä

Ulla Lassi

Pekka Alisaari

A method is provided for separating the impurities zinc, iron, calcium, copper and/or manganese from an aqueous solution that contains cobalt and nickel. The solution is brought into a mixing contact with an extraction solution, which is pre-loaded with cobalt and nickel ions, whereby the cobalt and nickel in the extraction solution are replaced with the impurity metals, and the aqueous solution is cleaned from impurities after this phase. This purified aqueous solution, raffinate, can be used to pre-charge the extraction solution so that a minor part of the raffinate is contacted with a pre-neutralized extraction solution, whereby the cobalt and nickel replace the alkali metal, alkali earth metal or ammonium ion that is used in the pre-neutralization.

Method for separating zinc, iron, calcium, copper and manganese from the aqueous solutions of cobalt and/or nickel

The invention relates to a method for extracting copper in liquid-liquid solvent extraction from aqueous solutions with a high sulphate content, by raising the viscosity of the extraction solution and by dispersing the aqueous solution into drops, achieving a dense drop aggregation. The viscosity of the extraction solution may be raised either by increasing the content of the actual extractant, the extraction reagent, in the extraction solution or by using a diluting agent with a higher viscosity than that of the diluting agent normally used. By raising the viscosity of the extraction solution the mixing durability of the extraction dispersion can be increased and resulting of that the amount of residual drops is decreased. Other advantages are that the extraction solution flow of the extraction process decreases in relation to the flow of the aqueous solution acting as the copper source and that the size of the extraction equipment needed is reduced.

Method for extracting copper from an aqueous solution

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Pori, Finland

Esa Lindell