Cobalt
Browse 60 curated documents about cobalt in The Archive — the 2RA-Edition digital library for engineering and scientific research. This collection of books, journal articles, theses, reports, and technical documents on cobalt spans extractive metallurgy, mining engineering, chemistry, and applied science. Every document is searchable in full text; sign in to read, download, ask AI questions about any document, or generate cited research drafts with the AI Researcher.
Bioleaching of arsenic rich cobalt mineral resources and eviden 2020 Hydrom
D. Barrie Johnson, Agnieszka Dybowska
Experiments were carried out to test the amenabilities of mineral deposits that contained cobalt deported in arseno-sulfide (cobaltite) and arsenide (skutterudite) minerals, to oxidative bioleaching at mesophilic temperatures and low pH. An ore sample from the Iron Mask deposit (Canada) and a mineral concentrate from a working mine (Bou Azzer, Morocco) were thoroughly characterised, both prior to
Selective extraction of nickel cobalt and copper 2026 Separation and Purifi
Wen Li, Junnan Lu
Solvent extraction behaviour of nickel, cobalt and copper from ammonia – glycine alkaline solutions using ketoxime extractant LIX ® 84-IC was systematically investigated. Extraction kinetics, pH-dependent selectivity, equilibrium isotherms and multistage extraction performance were evaluated using single-metal and multi-component simulated pregnant leach solutions (PLS). Kinetic studies revealed t
Loss behavior of Ni and Co during Al and Sc enri 2025 Transactions of Nonfer
Jian-cheng YU, Bao-zhong MA
The loss pathways of Ni and Co during Al and Sc enrichment were analyzed in the HNO3 leach liquor of saprolitic laterite ore. Although over 99% of Al and Sc can be enriched, about 40% of Ni and Co are also lost. The adsorption of Al−Sc precipitate is an important cause of Ni and Co loss. Subsequently, the precipitation behavior of metal ions in different nitrate solutions was studied. The results
CONTRIBUTION A L'AMELIORATION DE LA QUALITE DUSEL DE COBALT PAR PRECIPITATION ET A EV ALUER LA POSIBILITE DE SUBSTITUTION DE LA MAGNESIE (QMAG 45) PAR LA CHAUX (CARRILU), AINSI QU'A ETUDIER LA RELIXIVIA TION DU COBALT EN VUE D'OBTENIR UN COBALT METAL, SPECIFIQUEMENT POUR LES USINES DE MUTANDA MINING.
NYANGE NKULU Gerard, JACOB MASIALA
Ce travail présente les résultats d'une étude menée sur la solution après la précipitation du Fer, de l'Aluminium, du Manganèse et du Cuivre des usines de Mutanda Mining. L'objectif est de substituer, si possible, la magnésie par la chaux, utilisée pour la précipitation du Cobalt, afin d'améliorer la qualité de l'hydroxyde de Cobalt obtenu et de le relixivier pour obtenir un métal cobalt. Pour ce
RAPPORT DE STAGE Effectue a l'entreprise KAMOTO COPPER COMPANY
KABILA KITENGE SAMY
Ce rapport présente les expériences et les apprentissages réalisés lors d'un stage académique à l'entreprise Kamoto Copper Company (KCC). L'objectif principal de ce stage était d'acquérir une compréhension approfondie des processus métallurgiques appliqués à la production de cuivre et de cobalt. La méthodologie employée comprenait des visites dans différentes sections de l'entreprise, ainsi que de
Uranium Polishing from African Copperbelt Cobalt Process Liquors Using Phosphoric Acid
Roger K. M. Rumbu
Phosphoric-acid treatment is used to remove uranium from selected African Copperbelt cobalt process liquors. This structured critical review develops a comparative decision framework linking uranium-retention mechanisms, phosphorus demand, and cobalt-product acceptance. Industrial accounts, laboratory experiments, dissolution studies, and conceptual process comparisons are appraised separately. Th
2026 Acquah Nickel Cobalt Extraction from Lateritic Ores
Gertrude Acquah, William Skinner
The accelerating transition to low carbon energy systems has intensified the demand for nickel and cobalt from low-grade (<1.5 wt.%) refractory lateritic ores. This study aims to address the challenges and explore opportunities in the extraction of these metals from complex low-grade ores. We employed a combination of selective comminution-classification, mechanical activation through stirred-medi
TRAITEMENT PAR VOIE HUMIDE D’UN REJET MIXTE A GANGUE TRES DOLOMITIQUE « CAS DES REJETS DE FLOTTATION DE RUASHI MINING/ PROJET MUSONOI »
BWAMBU BUPE Emmanuel, Jean-Marie KANDA
Ce travail présente une étude sur la lixiviation ammoniacale suivie d'une extraction par solvant des rejets fortement dolomitiques de Ruashi Mining. L'objectif principal était d'optimiser le processus d'extraction des éléments de valeur, comme le cuivre et le cobalt, présents dans les rejets, qui contiennent en moyenne 0,77 % Cu et 0,08 % Co. Les méthodologies employées impliquent des essais de li
OPTIMISATION DES PARAMETRES DE PRECIPITATION SELECTIVE DU COBALT ET DES IMPURETES METALLIQUES (FAM) EN HYDROMETALLURGIE : ETUDE DES RATIOS MgO/Co ET CaO, DE LA TEMPERATURE ET DE L’AGITATION – APPLICATION A L’USINE MUMI
RIKASH KASHALA Trésor, MASIALA JACOB
Cette étude s'inscrit dans le cadre de l'optimisation des procédés hydrométallurgiques de récupération du cobalt à partir de minerais oxydés de la RDC. Elle se focalise sur l'usine MUMI (Mutanda Mining) et vise spécifiquement à optimiser les paramètres opératoires des deux étapes clés de précipitation : l'élimination des impuretés (Fer, Aluminium, Manganèse - Section FAM) et la récupération de l'h
Enrichment of Copper and Cobalt from Pyrite Cinder via Cyclic Leaching: Schwertmannite-Type Iron Precipitation at Low pH
Zhisheng Shi, Guanyong Sun
Effective iron removal from highly acidic leachates without neutralizer addition is a long-standing challenge in hydrometallurgy. For Cu-Co-bearing pyrite cinder, we demonstrate that a cyclic leaching process achieves this outcome. Operating entirely without neutralizers, the process consumed 96% of residual acid, enriched Cu and Co 4.76- and 3.88-fold, and removed 48.2% of iron, all while maintai
Selective Co/Ni Separation in Sulfate Media by Continuous Counter‑Current Membrane‑Assisted Solvent Extraction
Kurniawan Kurniawan, Aude Hubaud Heidet
A continuous counter-current membrane-assisted (CCCMA) extractor used wettable membranes (hydrophobic or hydrophilic properties) to separate organic and aqueous phases. In this study, the CCCMA extractor was evaluated as an alternative to conventional gravity-based phase-disengagement mixer-settlers for solvent extraction (SX) of critical metals, targeting cobalt (Co) and nickel (Ni). The performa
Selective Extraction of Nickel and Cobalt from Limonitic Laterite via Optimized Sulfation Roasting–Water Leaching and Solvent Extraction
Maryam Osali, Farid Ahani
Limonitic laterites typically contain low Ni and Co contents and significant impurities, making the development of technical and economically feasible processes challenging. To address this challenge, this study investigates and evaluates an integrated hydrometallurgical process comprising sulfation roasting, water leaching, and solvent extraction (SX) for the selective recovery of Ni and Co from
Optimisation de la dose de mixture dolomitique à la flottation des minerais cupro-cobaltifère du remblai R 401
MUFUNZ NTAMB Evodie, Ass. Ezéchiel KAZADI MWAPE
Le concentrateur de Kolwezi éprouve d'énormes difficultés pour fonctionner et ce sur tous les plans. Pour remonter la pente, la résolution à court terme est celle de recourir aux anciens stocks qui font d'office des nouvelles alimentations, étant donné que la Gécamines n'a presque plus des gisements potentiels à exploiter. Ce travail porte sur l'optimisation de la dose de mixture dolomitique à la
High-Performance Recovery of Cobalt and Nickel from the Cathode Materials of NMC Type Li-Ion Battery by Complexation-Assisted Solvent Extraction
Wen-Yu Wang, Hong-Chi Yang
The annual global volume of waste lithium-ion batteries (LIBs) has been increasing over years. Although solvent extraction method seems well developed, the separation factor between cobalt and nickel is still relatively low—only 72 when applying conventional continuous-countercurrent extraction. In this study, we improved the separation factor of cobalt and nickel by complexation-assisted solvent
Separation of Cobalt, Samarium, Iron, and Copper in the Leaching Solution of Scrap Magnets
Jian-Zhi Wang, Yi-Hsun Hsieh
With the growing awareness of protecting the urban environment and the increasing demand for strategic materials, recycling of SmCo magnets has become imperative. This paper provides a series of methods regarding the available hydrometallurgical technologies for recycling scrap magnets. This study aimed to recover samarium (Sm), cobalt (Co), copper (Cu), and iron (Fe) from acid leachate of SmCo sc
Aerobic Bioleaching of Six Brazilian Laterite Ores with Acidithiobacillus thiooxidans, Sulfobacillus species and Archaea at Various Conditions
Stefanie A. Hetz, Axel Schippers
Biohydrometallurgical laterite processing was explored at laboratory scale in this study. The extraction of nickel, cobalt, and other metals from six different laterite ores from three Brazilian deposits was tested via bioleaching in 2 L stirred tank reactors under aerobic conditions with acidophilic, sulfur-oxidizing bacteria and archaea. The experiments were run with three different mixed cultur
Thermodynamic Investigation on the Impact of Oxidized Copper–Cobalt and Copper Sulfide Ores Stream Mixture Toward the Dissolution of Cu and Co
Bienvenu Mbuya, Elvis Fosso‑Kankeu
The mineralogical characteristics of Copperbelt ores undergo continuous stratigraphic changes due to ongoing mining activities and weathering changes. These variabilities in mineralogy lead to drastically different behaviors in hydrometallurgical processing during the recovery of Cu and Co. Consequently, the technologies currently used in several hydrometallurgical industries have demonstrated the
2024 Ketegenov Ultrasound DES leaching of spent lithium batteries
Tlek Ketegenov, Kaster Kamunur
This study investigates the ultrasound-assisted leaching of Li and Co from spent batteries using a deep eutectic solvent (DES) composed of polyethylene glycol and thiourea. The synergistic effect of ultrasound and DESs was explored to enhance the efficiency of Li and Co recovery. The experimental results demonstrated that ultrasound significantly accelerates the leaching process, achieving up to f
Evaluation of an unsymmetrical dialkylphosphinic acid INET-3 for cobalt and nickel extraction and separation from sulfate solutions
Jiashuai Fu, Wen Xu
Cobalt and nickel are important strategic resources. Solvent extraction is an efficient way to separate and recover cobalt and nickel from spent batteries like ternary LIBs, NiMH, and Ni-Cd batteries. In this paper, we introduce an unsymmetrical dialkylphosphinic acid INET-3 – which possesses excellent extraction and separation performance for heavy REEs – to cobalt/nickel separation for the first
Optimisation du rendement de lixiviation du cobalt par variation du sulfate de fer heptahydrate et du metabisulfite de sodium
Etienne KADIATA
Ce travail présente les résultats de l'optimisation du rendement de lixiviation du cobalt par variation de sulfate de fer heptahydraté et du metabisulfite de sodium. L'objectif de cette étude est de retrouver les doses optimales de la masse du sulfate de fer heptahydraté et de la concentration du metabisulfite de sodium qui pouvaient solubiliser presque la totalité du cobalt contenu dans les miner
Use of Ion Exchange to Increase Value in Copper–Cobalt Operations
J. van Deventer
Ion exchange is an essential technique in hydrometallurgical operations for recovering and purifying valuable metals, particularly in the copper-cobalt sector. This study examines the applications of ion exchange, specifically focusing on chelating and solvent-impregnated resins, to achieve improved metal purity and economic efficiency. Through the selective removal of impurities from cobalt-rich
Optimisation du rendement de récupération du Cobalt au circuit FAM, cas des usines de Luilu (KCC)
TSHITOLA BLESSING Jenovic, ZEKA MUJINGA, AUBIN TSHIBANDA
La présente étude a porté sur les procédés d’optimisation et de purification du cobalt par précipitation sélective aux usines hydrométallurgiques de Luilu. Il a été constaté une importante perte de cobalt due à la coprécipitation liée aux fluctuations des paramètres de travail, associée à la résistance de certaines impuretés ayant un domaine de précipitation supérieur aux valeurs fixées à l’usine.
ÉTUDE COMPARATIVE DES PERFORMANCES ANALYTIQUES DE LA SPECTROMÉTRIE D'ABSORPTION ATOMIQUE ET DE LA SPECTROMÉTRIE D'ÉMISSION ATOMIQUE POUR L'ANALYSE QUANTITATIVE DU CUIVRE ET DU COBALT DANS LES ÉCHANTILLONS DES MINÉRAIS CUPRO-COBALTIFERES DE KOV
KUNDA KAKOMA Gauthier, ZEKA MUJINGA
Ce travail a pour objectif de fournir une base scientifique et technique permettant d’orienter le choix de la méthode la plus appropriée pour les besoins analytiques spécifiques de KCC, en tenant compte des exigences industrielles, minières et environnementales liées à l’exploitation des minerais cupro-cobaltifères de KOV. L’analyse quantitative des éléments métalliques (%Cu et %Co) présents dans
ETUDE COMPARATIVE DE L’ACTION DES COLLECTEURS KAX ET FC 2015 POUR LA FLOTTATION DES MINERAIS OXYDES CUPRO-COBALTIFERE DU REMBLAI R471 DE GCM.
NUMBI KALUME Aaron, Joh TSHAL
This work concerns the comparative study of the action of the KAX and FC 2015 collectors in the flotation of copper cobalt oxide ores from the R471 embankment. The objective of this study is to determine the optimal doses of KAX and FC 2015, in order to contribute to the recovery of copper and cobalt at the Kolwezi concentrator. To achieve this, two series of flotation tests were carried out where
CONTRIBUTION A L’ETUDE DE LA VARIATION DU MOUSSANT G41 A LA FLOTTATION DU MELANGE DES MINERAIS OXYDES CUPRO-COBALTIFFERE DU REMBLAI R-471 ET DE REJET MUTOSHI
LUKEKA NDAYI MWANA Dan, Assistant Ir. KABEY TSHAL Joh
This work focused on the study of the performances induced during the use of the foaming agent G41 in the flotation of copper and cobalt contained in a composite sample consisting of the mixture of ores from the R.471 backfill and MUTOSHI rejection, at competition of 50% by weight. The purpose of the orientation tests carried out was to determine the optimal doses of the commonly used reagents, in
VALORISATION DU MELANGE DES MINERAIS OXYDES CUPRO-COBALTIFERES DE REMBLAI R. 471 ET REJET MUTOSHI PAR VARIATION DE LA DOSE DU SILICATE DE SODIUM A LA FLOTTATION
SHIMBA WA ILUNGA Daniella, KABANGA TSHOTA Paulin
Dans ce travail, l'objectif principal était l'étude de l'influence de la dose de silicate de sodium sur les performances métallurgiques à la flottation du cuivre et cobalt contenu dans un échantillon de minerai du remblai R.471. Plusieurs essais ont été réalisés au cours de cette étude, dont la première série avait pour but de déterminer les doses des réactifs couramment utilisés en l'occurrence l
ANALYSE DES PARAMETRES TECHNIQUES DES EQUIPEMENTS D'EXCAVATION ET DE TRANSPORT DANS LA MINE A CIEL OUVERT. « Cas de la Mine de KOV »
KABULO KAYIBA Ange, ASS. LOLY MUDAGE David
La mine de KOV est l'une des plus grandes mines de cuivre et de cobalt à ciel ouvert au monde, opérée par KCC (Kamoto Copper Company). Face à des défis opérationnels majeurs, cette étude vise à analyser les paramètres techniques et opérationnels des équipements d'excavation et de transport. L'objectif principal est d'optimiser les coûts de production tout en maintenant la compétitivité de KCC sur
Tentative d’amélioration de la récupération dans le circuit de broyage humide-concentration magnétique par intégration d’un circuit de flottation à la mousse dans le projet de partenariat GCM-MCC
MAKONGA MUJINGA Amelia Rose, Professeur Jacob NGOY MASIALA
Ce travail présente les résultats d’une étude menée sur la flottation du minerai mixte cuprocobaltifère du remblai R-027 de la mine à ciel ouvert de MUPINI, titrant environ 1,68 % Cu et 0,59 % Co, en vue de son traitement le circuit broyage-concentration magnétique afin d’apporter une amélioration de la qualité des concentrés issu de la concentration magnétique. De ce fait les paramètres suivants
CONTRIBUTION A L’ETUDE DE LA LIXIVIATION DES REJETS DE LA MINE DE KINGAMYAMBO « Cas du concentrateur de Kolwezi »
KASONGO DAVID David, ZEKA MUJINGA
Ce travail porte sur la valorisation du cuivre et du cobalt contenu dans les rejets de l'exploitation de l'ancienne mine à ciel ouvert de Kingamyambo de la Gecamines. L'objectif de cette étude est d'explorer des méthodes alternatives d'extraction et de valorisation des métaux présents dans les rejets, compte tenu du coût opératoire élevé du concentrateur. Une étude minéralogique a révélé que la ma
OPTIMISATION DU RENDEMENT DE RECUPERATION DE LA LIXIVIATION COBALT A PARTIR D’UNE SOLUTION LIXIVIANTE PROVENANT DE LA SECTION ABSORPTION.
KALENDA MWANZA Pius, Jacob MASIALA NGOY
La présente étude porte sur l’optimisation du rendement de solubilisation de la lixiviation du cobalt à partir d’une solution lixiviante provenant de la section d’absorption. Un échantillon de minerais provenant de nos deux carrières à savoir la carrière de Musonoie et Kingamyambo a été préparé et caractérisé afin d’être soumis à des tests de lixiviation. Trois paramètres opératoires ont été étudi
OPTIMISATION DES PARAMETRES DE FILTRATION EN VUE DE REDUIRE L’HUMIDITE DU CAKE D’HYDROXYDE DE COBALT DE 68% A 60%
TSHINYEMBA KANDALA Fils, NGAMBA MIMBO Guelord
Cette étude vise à optimiser les paramètres de filtration afin de réduire l'humidité du cake d'hydroxyde de cobalt de 68% à 60% dans le cadre de l'usine Mutanda Mining. Une approche statistique a été adoptée pour développer un modèle mathématique contrôlant l'humidité à la sortie des filtres presses, en évitant les baisses de production liées aux pannes des séchoirs causées par des bouchages de la
Leach Optimisation tests to increase the leaching efficiencies and recoveries of Copper and Cobalt from an oxide/sulphide concentrate
Seshree Krishna, Edgar Kapakyulu
This report presents the results of leach optimisation tests conducted by Mintek for Kamoto Operating Limited, aimed at improving the leaching efficiencies and recoveries of copper and cobalt from an oxide/sulphide concentrate. The objective was to address the low leaching efficiencies currently experienced by the plant, which adversely affects recovery rates of these valuable metals. Methodology
Marcelo Adasme Extraccion Sinergica de E
Marcelo Ignacio Adasme Valdés, Romina Cayumil Montecino
Este documento presenta una tesis de pregrado que aborda la extracción sinérgica de elementos de valor desde muestras de relaves mineros. El objetivo principal es desarrollar un método eficiente y sostenible para recuperar metales valiosos presentes en los residuos de la minería. Se llevó a cabo un estudio experimental que incluyó la recolección y caracterización de las muestras de relaves, así co
Le piège de la tolérance
M. Kalamo
Ce rapport aborde les enjeux et défis liés à l'exploitation artisanale du cuivre-cobalt dans la région du Haut-Katanga et du Lualaba en République Démocratique du Congo (RDC). L'objectif principal de cette étude est de fournir une analyse approfondie des dynamiques socio-économiques et politiques entourant ce secteur, souvent perçu comme un double tranchant pour les communautés locales. La méthodo
Establishment of a Hydrometallurgical Scheme for the Recovery of Copper, Nickel, and Cobalt from Smelter Slag and Its Economic Evaluation
Labone Lorraine Godirilwe, Kazutoshi Haga
In pursuit of carbon neutrality, the demand for metals that are necessary for the development of clean energy technologies is rapidly increasing. Metallurgical waste, such as slag, presents a promising secondary source of these key metals. This research aims to develop an eco-friendly hydrometallurgical process to recover Cu, Ni, and Co from discarded copper/nickel slag. High-pressure acid leachin
Minimisation of Cobalt Coprecipitation During the Removal of Iron, Aluminium, and Manganese in the Cobalt Circuit (FAM) by Oxidising the Bath with Hydrogen Peroxide, Case Study: The METALKOL Hydrometallurgical Plant in the Democratic Republic of Congo
Mungwa Kalundu Gaylord, Yambele Kunyema Louise
The removal of impurities from cobalt-bearing solutions is an important step in the processing of cobalt to obtain a high-quality product. The main problem at this stage is the loss of cobalt that occurs through coprecipitation. A sample of cobalt-rich solution was taken from the feed to the Iron, Aluminium and Manganese (IAM) circuit at the Metalkol hydrometallurgical plant in the Democratic Repu
2014 Saka Nitric acid leaching of nickel and cobalt laterites
Onur Saka
This thesis study is related to the extraction kinetics of nickel and cobalt from lateritic nickel ores from the Gördes/Manisa region of Turkey. The experimental studies involved the optimization of the extraction process using nitric acid as the leaching agent. Various parameters affecting the extraction efficiency were systematically investigated, and the results indicated significant variabilit
Leaching analysis of copper and cobalt from sulfide ores in sulfuric acid- sodium chloride media
KASONGO Brest K, Mamookho E Makhatha
This dissertation explores the leaching processes of copper and cobalt from sulfide ores using sulfuric acid and sodium chloride media. The objective is to investigate the efficiency and kinetics of metal extraction in this specific chemical environment. A systematic methodology was adopted, incorporating experimental designs to assess the influence of various parameters such as temperature, acid
EXTRACTION OF NICKEL AND COBALT FROM LATERITIC ORES BY NITRIC ACID
Onur Saka
This thesis study is related to the extraction kinetics of nickel and cobalt from lateritic nickel ores from the Gördes/Manisa region of Turkey. The experimental studies involved the optimization of extraction conditions using nitric acid as the leaching agent. The research aimed to evaluate the efficiency of metal extraction and to establish the optimal conditions for the maximum recovery of nick
Processing of Waste Copper Converter Slag Using Organic Acids for Extraction of Copper, Nickel, and Cobalt
Pratima Meshram, Uday Prakash
An innovative, economical, and environmentally sound hydrometallurgical process has been proposed for recovering Cu, Ni, and Co from copper-rich converter slag by organic acids. In the leaching experiments, the effects of organic acid concentrations, pulp density, temperature, and time were investigated. Optimum recovery of 99.1% Cu, 89.2% Ni, 94% Co, and 99.2% Fe was achieved in 9–10 h at 308 K (
Leaching analysis of copper and cobalt from sulfide ores in sulfuric acid- sodium chloride media.
KASONGO Brest, Mamookho Elizabeth Makhatha
This dissertation investigates the leaching behavior of copper and cobalt from sulfide ores using a sulfuric acid-sodium chloride media. The objective of the study is to evaluate the efficiency of the leaching process and to identify the optimal conditions for the extraction of these metals. A comprehensive experimental methodology was employed, involving the preparation of sulfide ore samples, fo
Selective cobalt and nickel electrodeposition for lithium-ion battery recycling through integrated electrolyte and interface control
Kwiyong Kim, Darien Raymond
Molecularly-selective metal separations are key to sustainable recycling of Li-ion battery electrodes. However, metals with close reduction potentials present a fundamental challenge for selective electrodeposition, especially for critical elements such as cobalt and nickel. Here, we demonstrate the synergistic combination of electrolyte control and interfacial design to achieve molecular selectiv
Efficient Synchronous Extraction of Nickel, Copper, and Cobalt from Low–Nickel Matte by Sulfation Roasting‒Water Leaching Process
Qiangchao Sun, Hongwei Cheng
This paper investigates an efficient method for extracting nickel (Ni), copper (Cu), and cobalt (Co) from low-nickel matte, addressing the low recovery efficiency typical of traditional pyrometallurgical processes. The objective was to optimize the parameters and mechanisms of sulfation roasting followed by water leaching using sodium sulfate as a sulfating additive. Employing rigorous testing und
CARACTERISATION HYDROMETALLURGIQUE DU MINERAIS DE JAMBERWA PAR LIXIVIATION ET DECANTATION. « CAS DE L’USINE DE SHITURU »
KASESA KAMBA Jenny, NGENDA Richard
Ce travail porte sur la caractérisation hydrométallurgique du minerai de Jamberwa par lixiviation et décantation dans les usines de Shituru (Gécamines S.A.). L'objectif de cette étude est de déterminer les conditions opérationnelles optimales de lixiviation et de décantation pour une solubilisation efficace du cuivre et du cobalt contenu dans le minerai, afin de faciliter les étapes ultérieures du
Design of Manganese removal circuit in the Cobalt bleeding solution by solvent extraction with D2EHPA : Kinetic limitations
Kafumbila Kasonta Joseph
It has been known for over thirty years that the extractant D2EHPA is effective for separating cobalt and manganese. Unfortunately, D2EHPA extracts calcium to the same extent as manganese. Consequently, in industrial practice, when D2EHPA is used to separate manganese and cobalt in the presence of calcium, stripping is performed using hydrochloric acid to prevent gypsum precipitation. Pilot plant
Corrosion resistance and microstructure of electrodeposited nickel–cobalt alloy coatings
Meenu Srivastava, V. Ezhil Selvi
Ni–Co alloys with varying cobalt content were electrodeposited employing sulphamate electrolyte. The changes in microstructure and corrosion behavior of electrodeposited nickel with respect to cobalt addition were studied. Scanning electron microscope, optical microscope and energy dispersive X-ray analysis were used to characterize the alloy coatings. The alloy co-deposition was observed to be an
Production of three pure solutions of Cobalt, Nickel and Magnesium from a solution containing these elements and saturated with calcium by solvent extraction with Cyanex 272
Kafumbila Kasonta Joseph
Over the past thirty years, we have gained more experience in the use of Cyanex 272 extractant in the production of high purity cobalt solution. Intensive pilot plant testing has contributed significantly to increasing our experience in using Cyanex 272 as a Cobalt extractant. Optimizing parameters through pilot plant tests is expensive. This is how our company developed a simulation model of the
Etude de la lixiviation en tas du minerai cupro-cobaltifère dans les mines de la Province du Katanga en République Démocratique du Congo
Patrick MBWEB KATSHIL
L'extraction du métal dans le minerai pauvre nous amène à chercher des techniques et méthodes permettant à extraire une bonne quantité de ce dernier à faible coût sans faire passer la gangue dans la solution. Pour cela, nous avons déterminé les paramètres de lixiviation pour récupérer le métal dans un minerai pauvre, en procédant à des essais de lixiviation en tas précédés par des analyses granulo
Analytical Microsystem for the Monitoring and Analysis of Cobalt in Aqueous Solutions Using LTCC Technology
Olga Natalia Bustos López, Francisco Valdés Perezgasga
This work is focused on the design and implementation of a microsystem for continuous colorimetric determination of cobalt in aqueous solutions in real time. The main goal is the colorimetric determination of cobalt by adapting colorimetric methodologies used in discontinuous analysis systems to a continuous flow system and its subsequent miniaturization using the LTCC (Low Temperature Co-fired Ce
Detection and analysis of cobalt in continuous flow using an analytical microsystem based on LTCC technology
Olga Natalia Bustos López, Hesner Coto Fuentes
This study presents a novel approach for the detection and analysis of cobalt using a continuous flow system based on low-temperature cofired ceramics (LTCC) technology. The objective was to develop a colorimetric method that efficiently measures cobalt concentrations within microliter sample volumes. Methodology involved adapting traditional discontinuous detection techniques to a continuous flow
CONTRIBUTION A LA VALORISATION DU Cobalt des rejets de denickelage. « Cas du circuit hydrométallurgique des Usines de l'UILU. »
Paulin KABANGA-TSHOTA
Ce mémoire présente une étude sur la valorisation du cobalt extrait des rejets de denickelage, en se concentrant sur le circuit hydrométallurgique des Usines de l'UILU. L'objectif principal est d'optimiser le processus de récupération du cobalt pour améliorer l'efficacité des opérations métallurgiques. La méthodologie adoptée inclut une analyse approfondie des processus actuels, des techniques de
Modelisation de la lixiviation et l’extraction par solvant d’un minerai cuprocobaltifère du gisement de Sokoroshe II (MMG Kinsevere)
Lumpungu Mundala, Jean Marie Kanda Ntumba
La présente étude porte sur un minerai cupro cobaltifère oxydé (≈2,3 % Cu ; 0,69 % Co) du gisement Sokoroshe II (MMG KINSEVERE, RD Congo), se minerai est très souvent alimenté avec un mélange d’autres minerais car selon le design de l’entreprise, la teneur de coupure doit être de 3,5 % cuivre. Cependant, Sokoroshe II présente 2 % en cuivre, considéré comme pauvre selon le design de l’entreprise. I
Etude de la lixiviation acide des boues bleues en vue d’une valorisation du cuivre et du cobalt
KASAKWA DENISE NAHOMIE, Dr.Ir.ROGER RUMBU
Ce travail présente les résultats de la valorisation du cuivre et du cobalt contenus dans les boues bleues des rejets du circuit hydrométallurgie de zinc par lixiviation directe en cuve agitée et extraction par solvant du cuivre, dont les teneurs sont respectivement de 3,09 % cuivre et 0,33 % cobalt. En effet ces teneurs sont jugées élevées rendant en conséquence ces rejets comme une ressource min
REMOVAL OF COPPER AND ZINC FROM A COBALT ELECTROLYTE BY ION EXCHANGE AT KAMOTO COPPER COMPANY’S LUILU PLANT
Y. Jurrius, K.C. Sole
The Luilu cobalt plant at Kolwezi, Democratic Republic of Congo, has been operating since the late 1950s, using a conventional precipitation flowsheet for removal of impurities from the cobalt process stream. Most impurities are, however, incompletely removed using this technology. Copper and zinc, both of which quantitatively deposit at the cathode in the cobalt electrowinning process, are two of
Investigation of cobalt sulfate precipitation by alcohol and influencing factors
Serdar Aktas, Haldun Gürcan
This work presents a method for the precipitation of cobalt sulfate by alcohols, specifically ethanol and methanol. The effect of the initial concentration of cobalt, the volumetric ratio of alcohol to cobalt sulfate solution, the addition of sulfuric acid and ammonia, and the effects of common ions on the precipitation percentage were investigated. The performances of ethanol and methanol were co
Electrosynthesis of cobalt sulphide through non-aqueous medium and its characterization
M M Uplane, S P Shinde
Cobalt sulphide thin films were prepared by electrodeposition technique on conducting glass and stainless steel substrates at varying bath temperatures. The films were synthesized through a non-aqueous medium using cobalt sulphate and sodium thiosulphate as initial ingredients, deposited in different volume ratios. The structural, optical, and microscopic characteristics of these films were thorou
Electrodissolution of cobalt in carbonate/bicarbonate media
J.A. Caldero´n, O.R. Mattos
The electrodissolution of cobalt in carbonate/bicarbonate solutions was studied at room temperature by steady state polarisation, interfacial pH measurements and Raman spectroscopy. The active dissolution of cobalt leads to an initial CoO film formation. The metal passivation occurs by a slow transformation of the CoO into a Co3O4 oxide. The influence of HCO3 and CO3 anions was investigated. Two d
Cobalt Electroplating in Choline Chloride-ethylene Glycol: A Comparative Study
Jamil A. JUMA, Wrya O. KARIM
In this work, cobalt electroplating from homogeneous oxidation of cobalt powder via iodine as a chemical oxidizing agent and from CoCl2·6H2O in choline chloride-ethylene glycol electrolytic bath was carried out at 90 °C. As relatively high temperature and corrosion resistive coating material, cobalt electroplating was performed. A number of electrochemical, spectroscopic and microscopic techniques
Cobalt Precipitation by Reduction with Sodium Borohydride
Jianming Lu
The reaction of cobalt reduction with borohydride is very complicated, with various authors reporting different reaction stoichiometries and proposing a number of mechanisms. There are conflicting claims regarding the removal of cobalt from zinc electrolyte using sodium borohydride. This research focuses on the stoichiometry of cobalt reduction with borohydride and the removal of cobalt from zinc
Electrowinning of cobalt from acidic sul
N. Pradhan, S.C. Das
Cobalt electrowinning from acidic sulphate solution was carried out in the presence and absence of chloride ion in the electrolyte. The effect of current density, electrolyte flow rate and temperature on cobalt electrowinning was studied from pure cobalt sulphate solutions and solutions containing 2000 mg dm-3 chloride ion. It was found that presence of chloride ion did not have any significant ef