Outotec Oyj

Outotec (Finland) Oy

Kemira Chemicals Oy

Danisco Sweeteners Oy

Danisco Finland Oy

Neste Corporation

Metso Outotec Finland Oy

Erkki Paatero

Mika Haapalainen

Bror G Nyman

Hannu A Paananen

Eero Ekman

Kari Hietala

Jari Tiihonen

Stig-Erik Hultholm

Heikki Heikkilä

Vili Ravanko

Heikki Heikkil&auml;

Virpi Rämö

Juho Jumppanen

Rami Saario

Hannu Laitala

Kari Valkama

Maija Rouhiainen

Ari Kärki

Riina Ahtiainen

Ville Miettinen

Sami Virolainen

Tiina Tervala

Pekka Vapaaoksa

Kari Saari

Marko Lahtinen

Jukka Kortelainen

Nina Mäyrä

James Kabugo

Ari K&auml;rki

Heikki Mononen

Kai Jyrkkä

Kai Jyrkkae

Virpi Ramo

The present disclosure relates to hydrometallurgical technologies wherein liquid-liquid extraction, also called solvent extraction, is used to separate and concentrate metal ions. Exemplary embodiments relate to solvent extraction of copper and a diluent useful in copper solvent extraction. A bio-based composition can fulfil physico-chemical properties that are desired for solvent extraction. Moreover, a composition is disclosed, which in addition to providing more environmental friendly alternative, can also improve the solvent extraction process of copper.

Renewable isoparaffins as diluent in hydrometallurgical liquid-liquid extraction process

The invention relates to a method for regenerating the extractive potential of an organic hydroxyoxime-based extraction solution used in the recovery of metals by liquid-liquid extraction. The method is two-stage, in which a solid hydroxylamine 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 method of the invention is suitable for treatment of degraded oxime metal extractants in various process organic solutions both in aldehyde and ketoxime extractant solutions. The method can also be used to treat a mixture of degraded oxime extractants.

Treatment of degraded oxime metal extractants in process organic solutions

The present invention provides a method of recovering copper and zinc from an aqueous sulfate and chloride containing solution. In the first process step zinc and copper are simultaneous extracting with an extraction solution comprising a liquid chelating cation exchanger and a liquid anion exchanger. The extraction is followed by consecutive stripping stages. First the anionic species are washed from the organic phase with one or more aqueous solutions and finally the copper is stripped with an aqueous acidic solution.

Method for recovery of copper and zinc

The invention relates to a method for preparing a gold-containing solution by chloride leaching from gold-bearing raw materials. A further object of the invention is to provide a method for recovering gold and optionally silver from the prepared gold-containing solution. The invention relates also to a process arrangement for recovering gold and optionally silver.

Method of preparing a gold-containing solution and process arrangement for recovering gold and silver

The invention relates to 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. 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.

Method of regeneration an organic extraction solution that has been used in a liquid-liquid extraction process

The invention relates to an apparatus and method for removing molybdenum and other possible impurities from an organic copper-containing extraction solution in connection with the liquid-liquid extraction related to copper recovery. The removal of impurities occurs in one or several removal units built into the organic extraction solution storage tank.

Apparatus and method for removing impurities in connection with liquid-liquid extraction of copper

A method for the selective recovery of uranium from a sulphate-based acidic aqueous solution of uranium containing iron and other metals by means of solvent extraction, in which the extractant used in the organic extraction solution is bis(2-ethylhexyl) phosphate and a liquid branched trialkyl phosphine oxide is the modifying agent. It is typical of the method that the uranium concentration in the feed solution is less than 50 mg/l and a reducing agent is introduced into the aqueous and/or extraction solution to prevent the permanent oxidation of iron to trivalent. In the method the majority of the extraction solution is circulated in a circuit consisting of the extraction stage and the storage tank and only a small part of the uranium-loaded extraction solution is routed to scrubbing and stripping.

Extraction process

The invention relates to a method for recovering gold by solvent extraction from an acidic chloride-containing aqueous solution or from slurry containing gold-bearing solids using a diester-based reagent that is poorly soluble in water as organic extraction solution. In accordance with the method, gold is extracted extremely effectively, but other precious metals and many other metals quite sparingly. Gold is stripped from the extraction phase with pure water, from which the gold can be reduced either chemically or electrochemically.

Method for recovering gold by solvent extraction

The invention relates to the use of a weakly acid cation exchange resin for chromatographic separation of carbohydrates. In the invention the hydrophilic/hydrophobic interaction of carbohydrates, sugars and sugar alcohols with the weakly acid cation exchange resin is utilized. The weakly acid cation exchange resin is used for separation of hydrophobic saccharides, such as deoxy, methyl and anhydrosugars and anhydrosugaralcohols from more hydrophilic saccharides.

Use of a weakly acid cation exchange resin for chromatographic separation of carbohydrates

The invention relates to sulphonated polymer resins, particularly polymer resins with a sulphonated shell layer, and the preparation thereof. Resins according to the invention are prepared by sulphonating a polymer in a non-swollen state with substantially pure gaseous sulphur trioxide substantially in the shell layer of the polymer particles. The polymer to be sulphonated can be for example a styrene-DVB copolymer. The resins according to the invention can be used for example as chromatographic resins, ion-exchange resins and catalyst resins.

Sulphonated polymer resin and preparation thereof

A method for manufacturing alkali metal or alkaline-earth metal formate, starting from a formate anion comprises at least the following sequential steps: A) conversion of a solid anion exchanger to formate form by feeding into it a solution containing a formate anion, B) exchanging the formate anion in the anion exchanger for a replacing anion by feeding into it an alkali metal or alkaline-earth metal salt solution of this replacing anion, C) recovering the alkali metal or alkaline-earth metal formate solution eluted from the anion exchanger during the exchange of the formate anion. The anion exchanger is converted to formate form by feeding into it a sodium formate solution, a formic acid solution or a solution which contains both sodium formate and formic acid. The method can be used for production of potassium formate or calcium formate.

Method for manufacturing alkali metal or alkaline-earth metal formate

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Helsinki, Finland

Erkki Paatero