Selaus tekijän mukaan kokoelmassa "Virolainen, Sami"Tieteelliset julkaisut
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Chromatographic Separation of Rare Earth Elements as MGDA Complexes on Anion Exchange Resins
(MDPI, 16.03.2023)Chromatographic separation of rare earth elements (REE) as anionic complexes with chelating aminopolycarboxylate ligand methylglycine N,N-diacetate (MGDA) was studied experimentally. A synthetic mixture of La, Nd, and Eu ... -
Continuous ion exchange for hydrometallurgy: Purification of Ag(I)–NaCl from divalent metals with aminomethylphosphonic resin using counter-current and cross-current operation
(Elsevier, 2014)Continuous simulated moving bed (SMB) type ion exchange processes are usually operated in cross-current mode for metal separations whereas counter-current mode is commonly used for fine chemicals. The use of both process ... -
Controlled partial neutralization of amphoteric ion exchange resin for improved metals separation
(Elsevier, 2013)Controlled partial neutralization of an amphoteric aminomethylphosphonium functional ion exchange resin (Lewatit TP-260) was investigated. The particular goal of controlled neutralization was to replace H+ in the acidic ... -
Ion exchange purification of a silver nitrate electrolyte
(Elsevier, 14.12.2018)A novel ion exchange process was studied to remove high concentration of Cu impurity from AgNO3 electrolyte was studied. A suitable ion exchange resin was screened using laboratory scale experiments with a synthetic nitrate ... -
Ion exchange recovery of rhenium from industrially relevant sulfate solutions: single column separations and modeling
(Elsevier, 2015)In this study, phenomena behind recovery of Re by weak anion exchangers from sulfate solutions containing Mo and As as impurities were investigated. All the metals exist as different kinds of oxyanions or, at some conditions, ... -
Ion exchange recovery of silver from concentrated base metal-chloride solutions
(Elsevier, 2015)Ion exchange has not been extensively studied nor industrially used for recovering small amounts of silver from concentrated base metal-chloride solutions. A novel multistep process utilizing a weak anion exchanger with ... -
Liquid-liquid synthesis of oximes from carbonyl compounds: Formation at neutral conditions and degradation at acidic hydrometallurgical process conditions
(John Wiley & Sons, Inc., 2017)BACKGROUND In order to elucidate kinetics in the synthesis of oxime liquid–liquid extraction reagents, used as ligands in hydrometallurgical copper production, the oximation reactions of salicylaldehyde and 2′‐hydroxyacetophenone ... -
Membrane Filtration Enhanced Hydrometallurgical Recovery Process of Indium from Waste LCD Panels
(Springer Nature, 02.10.2020)Insufficient recycling of a continuously increasing amount of liquid crystal display (LCD) waste leads to the waste of potentially recyclable materials, especially rare and critical indium. Moreover, landfilling of LCD ... -
Modeling the liquid-liquid extraction equilibrium of iron (III) with hydroxyoxime extractant and equilibrium-based simulation of counter-current copper extraction circuits
(Elsevier, 2018)The phase equilibrium in the loading and stripping stages of the liquid–liquid extraction of iron (III) with hydroxyoxime extractant in kerosene was studied over a wide range of hydroxyoxime extractant (Acorga M5640, 3–25 ... -
Modeling the phase equilibrium in liquid-liquid extraction of copper over a wide range of copper and hydroxyoxime extractant concentrations
(Elsevier, 2017)The phase equilibrium in the loading and stripping stages of liquid–liquid extraction of copper with hydroxyoxime extractant in kerosene was studied over a wide range of Acorga M5640 extractant (5–25 vol%) and copper (1–45 ... -
Novel mechanical pre-treatment methods for effective indium recovery from end-of-life liquid-crystal display panels
(Elsevier, 15.05.2019)This study investigated the suitability of mechanical pre-treatment methods (mechanical abrasion and treatments of heat, laser, and plasma) together with a hydrometallurgical process comprising leaching and cementation for ... -
Numerical simulation of counter-current liquid–liquid extraction for recovering Co, Ni and Li from lithium-ion battery leachates of varying composition
(Elsevier, 2019)Fractionation of Li-ion battery waste leachates into high-purity Li, Ni, and Co streams in a liquid−liquid extraction circuit was studied using numerical simulations. A new mechanistic mathematical model explaining the ... -
Polyacrylonitrile-encapsulated amorphous zirconium phosphate composite adsorbent for Co, Nd and Dy separations
(Elsevier, 2018)Recycled Nd and Dy from the end-of-life NdFeB permanent magnet is an important supplement for the increasing demand of rare-earth elements. Thus, there is an urgent need to develop an environmentally friendly recycling ... -
Recovering rare earth elements from phosphogypsum using a resin-in-leach process: Selection of resin, leaching agent, and eluent
(Elsevier, 10.08.2019)Phosphogypsum (PG) is an attractive secondary raw material for rare earth elements (REEs) because it is abundant and contains significant amounts of REEs. Herein, the resin-in-leach (RIL) process for REE recovery from PG ... -
Recovery of indium from indium tin oxide by solvent extraction
(Elsevier, 2011)Recovery of indium from LCD screen wastes, which contain indium in the form of indium tin oxide (ITO) as the electrode material, is becoming economically and environmentally justified. Indium is a valuable metal and the ... -
Recovery of lithium from leach solutions of battery waste using direct solvent extraction with TBP and FeCl3
(Elsevier, 22.03.2021)Although societal interest in lithium has grown due to its increased demand for manufacturing of lithium ion batteries (LIBs), recent research studies about LIB recycling with solvent extraction did not focus on Li recovery ... -
Recovery of rare earth elements from phosphogypsum waste in resin-in-leach process by eluting with biodegradable complexing agents
(Elsevier, 02.02.2021)Phosphogypsum waste is a potential, secondary rare earth element (REE) source that is available in very large volumes. Extraction and purification of REE from this complex waste was studied using resin-in-leach (RIL) ... -
Recovery of valuable metals from argon oxygen decarburization (AOD) dusts by leaching, filtration and solvent extraction
(Elsevier, 2013)For each ton of steel produced from a typical steelmaking plant, up to several tens of kilograms of dust, containing significant amounts of valuable and/or environmentally harmful metals, are also produced. A hydrometallurgical ... -
Removal and recovery of arsenic from concentrated sulfuric acid by solvent extraction
(Elsevier, 13.05.2019)Arsenic-contaminated sulfuric acid solutions are produced in large quantities as by-product during pyrometallurgical processing of sulfide minerals. Options for re-using such acid solutions are increased if the arsenic is ... -
Removal of calcium and magnesium from lithium brine concentrate via continuous counter-current solvent extraction
(Elsevier, 2016)In this research project, a process for purifying Li brine concentrate with a typical composition of Li 30 g/L, Ca 1.36 g/L, Mg 0.049 g/L via solvent extraction was studied. The goal was to remove Ca to below 20 mg/L and ...
