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Showing 1 to 20 of 22 for “"hydrometallurgy"”.
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Interrelationship of hydrology, microbial colonisation and hydrometallurgy in a simulated chalcopyrite heap leach
Chalcopyrite is the most abundant primary copper sulphide mineral found worldwide. As copper grades of ores available for extraction decrease, heap bioleaching is gaining interest as a potential operating alternative to traditional methods of roasting and smelting. The efficiency by which bacteria …
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The Ferrous Regeneration Process for Use in Alternate Anode Reaction Technology in Copper Hydrometallurgy
… using Fe(II)/Fe(III)-SO2 reactions for copper hydrometallurgy; however little has been done to study it specifically. The process regenerates Fe(II) via Fe(III) reduction by SO2(aq), catalyzed by activated carbon particles. To better understand and improve the process, two studies have been …
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Bio-engineered gas diffusion electrodes (GDEs) for proton exchange membrane fuel cells (PEMFCs)
… is necessary to reduce costs per unit. Current hydrometallurgy and pyrometallurgy techniques do not provide a ‘clean’ or economically viable solution to PGM recovery when compared to bio-hydrometallurgy. Bio-catalysts can be manufactured by coupling the oxidation of hydrogen to the reduction of …
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A feasibility study for reset control of an industrial batch reactor
… reactions; multiple reactions; dissolve; leach; hydrometallurgy; platinum; Precious Group Metals (PGMs).
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Studies on the recovery of useful chemicals from waste and secondary materials
… to pyrometallurgy, the chemital methods used in hydrometallurgy and its application to metal recovery, with particular reference to the recovery of metals as useful compounds. Chapters 2 and 3 show that hydrometallurgical methods can be applied to recovery of metals, as useful compounds, from …
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Rare Earth Elements (REEs) Recovery and Hydrochar Production from Hyperaccumulators
… in grass leaves. With the use of conventional hydrometallurgy, around 95% of Y, La, Ce, and Dy were extracted from the GL using 0.5 mol/L H2SO4 at a solid concentration of 5 wt.%. Subsequently, microwave-assisted hydrothermal carbonization (MHTC) was used to convert the leaching residue into …
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Metal complexes of oxygen-, nitrogen-, and sulphur-containing macrocyclic ligands; synthetic and structural studies
… agents for use in pollution control and hydrometallurgy. In addition, they have impinged on the biomedical field, where they have become likely candidates for therapeutic reagents required for the treatment of metal intoxication, or used as diagnostic agents in the form of radio-labelled …
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Extraction of Rare Earth Elements from Aqueous Solutions by Using Hydrometallurgical Techniques
… depend on essential elements like REE. Within hydrometallurgy, the solvent extraction (SX) method plays a crucial part in the purification of rare earth elements (REE) from concentrated solutions through efficient elemental extraction and high purity. Due to its remarkable extraction capacity …
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The recovery of valuable base metals from electronic waste using a biological matrix extracted from Black soldier flies
… dedicated solely for this purpose. While in hydrometallurgy, research in e-waste metal recycling has been largely focused on metal extraction whilst downstream metal recovery processing studies are limited. The strategy often employed in e-waste metal recovery via hydrometallurgy is base …
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An Electrochemical Study of the Oxidative Dissolution of Synthetic Nickel-Iron Sulphide Minerals in Aqueous Media
… of the reaction. The implication for extractive hydrometallurgy is discussed. The use of a convolution transform of voltammetric currents with a (πt)-1/2 function as applied to simple electron transfer is described. In addition, the derivation of a functional form for the treatment of …
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Extraction of zinc from scrap steel using zinc-bromine battery technology
… steel recycling methods (pyrometallurgy and hydrometallurgy) are energy intensive or only pass the problem of recycling onto a separate waste stream.<br/><br/>This research investigates the extraction and recovery of zinc from scrap steel using zinc-bromine battery (ZBB) technology. …
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Assessment of a Shredding Technology of Waste Printed Circuit Boards in preparation for Ammonia-based Copper leaching
… metals which makes them attractive to recyclers. Hydrometallurgy is a widely explored technology that allows for scalable operations for recovering metals from PCBs. However, for it to be effectively employed, the metals in PCBs need to be liberated or be accessible to leach agents. To date, this …
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Investigating Early-Stage Process Flow and Reactor Sequencing to Maximise Gold Extraction ln the Thiosulphate Leaching of Waste Printed Circuit Boards
… recovered using metallurgical methods like hydrometallurgy, pyrometallurgy, or a combination of the two. Successful implementation of pyrometallurgical technologies have been demonstrated in large-scale integrated recycling operations. These require high capital investment, large volumes of …
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Advancing Lithium Extraction from Nevada’s Sedimentary Claystones: Hydrometallurgical Pathways and Sustainability Perspectives
The global transition toward electrified transportation and renewable energy storage hasestablished lithium as a critical mineral, with demand projected to grow four- to six-fold by 2040. Conventional supply chains: brines and hard-rock spodumene, face mounting technical, environmental, and …
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Možnosti hydrometalurgického procesu pro získávání lehkých kovů
Tato bakalářská práce se zaměřuje na sestavení jednotlivých stupňů hydrometalurgického procesu pro získávání lithia, hořčíku a hliníku ze slídy. Hlavním zaměřením byl primární proces hydrometalurgie, tedy loužení slídy za účelem zisku výluhu obohaceného o ionty lithia, hořčíku a hliníku. …
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Selective Recovery of Rare Earth Elements using Green Foam Flotation
The extraction of REE from the primary ores is a complex process and causes damages to the environment. Hence, recent research efforts in this field have focused on finding alternative separation methods to reduce the costs and environmental impacts of the process. One such alternative approach …
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Evaluating the Potential of Scaling due to Calcium Compounds in Hydrometallurgical Processes
A fundamental theoretical and experimental study on calcium sulphate scale formation in hydrometallurgical solutions containing various minerals was conducted. A new database for the Mixed Solvent Electrolyte (MSE) model of the OLI Systems® software was developed through fitting of existing …
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ΕΚΧΥΛΙΣΗ ΛΑΤΕΡΙΤΩΝ ΜΕ ΘΕΙΙΚΟ ΟΞΥ ΥΠΟ ΠΙΕΣΗ
THE EXTRACTION OF NICKEL AND COBALT FROM LOW GRADE GREEK LATERITE ORIS IS ACCELARATED AT CONDITIONS OF HIGH TEMPERATURE- PRESSURE. THE EXTRACTION VALUES REACH100% UNDER CONDITIONS OF 220-260 C TEMPERATURE, 40-60 BAR PRESSURE 2 H DURATION. NUTRALIZATION OF THE EFFLVENTS IS VERY SATISFACTORY. THE …
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ΑΝΑΚΤΗΣΗ ΓΕΡΜΑΝΙΟΥ ΑΠΟ ΑΡΑΙΑ ΥΔΑΤΙΚΑ ΔΙΑΛΥΜΑΤΑ ΚΑΙ ΔΙΑΧΩΡΙΣΜΟΣ ΑΥΤΟΥ ΑΠΟ ΑΡΣΕΝΙΚΟ, ΜΟΛΥΒΔΟ ΚΑΙ ΨΕΥΔΑΡΓΥΡΟ ΜΕ ΤΗ ΜΕΘΟΔΟ ΤΗΣ ΕΠΙΠΛΕΥΣΗΣ
ΜΕΛΕΤΗΘΗΚΕ Η ΙΟΝΤΙΚΗ ΕΠΙΠΛΕΥΣΗ ΔΙΑΛΥΜΑΤΩΝ GE ΚΑΙ ΤΩΝ ΠΑΡΑΜΕΤΡΩΝ ΠΟΥ ΤΗΝ ΕΠΗΡΕΑΖΟΥΝ. ΑΦΟΥ ΒΡΕΘΗΚΑΝ ΟΙ ΒΕΛΤΙΣΤΕΣ ΣΥΝΘΗΚΕΣ ΓΙΑ ΤΟ ΔΙΑΧΩΡΙΣΜΟ ΤΟΥ GE ΑΠΟ ΑΡΑΙΑ ΥΔΑΤΙΚΑ ΔΙΑΛΥΜΑΤΑ, ΣΤΗ ΣΥΝΕΧΕΙΑ ΕΦΑΡΜΟΣΤΗΚΑΝ ΓΙΑ ΤΟΝ ΕΚΛΕΚΤΙΚΟ ΔΙΑΧΩΡΙΣΜΟ ΤΟΥ GE ΑΠΟ ΔΙΑΛΥΜΑΤΑ ΟΠΟΥ ΣΥΝΥΠΑΡΧΕΙ ΜΕ ΤΟ ΑΡΣΕΝΙΚΟ. ΣΕ ΑΝΤΙΘΕΣΗ ΜΕ …
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ΒΕΛΤΙΣΤΟΠΟΙΗΣΗ ΤΗΣ ΕΚΧΥΛΙΣΗΣ ΛΑΤΕΡΙΤΩΝ ΜΕ ΘΕΙΙΚΟ ΟΞΥ
THE ATMOSPHERIC PRESSURE LEACHING OF NICKELIFEROUS LATERITES BY SULFURIC ACID IS AN ALTERNATIVE METHOD TO THE HIGH PRESSURE LEACHING. TWO TYPES OF ORES WERE STUDIED (SERPENTINIC, HEMATITIC) AND THE INFLUENCE OF VARIOUS PARAMETERS LIKE LEACHING TEMPERATURE, ACID CONSUMPTION, PULP DENSITY, PREHEATING …
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