Leaching
Browse 60 curated documents about leaching 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 leaching 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.
Recovery of valuable metals from copper slag
Changda Zhang, Bin Hu
The copper smelting process produces plenty of copper slag every year, which is a hazardous solid waste but also a secondary resource. In the present study, the extraction of copper, nickel, and cobalt from copper slag was investigated through the processes of sulfation roasting–water leaching and sulfation roasting –sulfate decomposition roasting–water leaching, respectively. Compared with the su
Vanadium Extraction from High Calcium-Content Vanadium Slag by Calcification Roasting
Hong-Yi Li, Ning Wang
Compared to traditional sodium roasting, calcified roast inhibits chlorine pollution. A vanadium extraction technique based on a calcified roast is especially suitable for vanadium slag with high calcium content. In this report, V2O5 was extracted from vanadium slag by calcified roast followed by acid leaching and hydrolysis precipitation. In optimized conditions, the high silicon low vanadium sla
Volatilization of Rhenium from Molybdenite Concentrate by Oxidative Roasting
Guanghui Li, Rong Sun
This study investigates the volatilization of rhenium from molybdenite concentrate through oxidative roasting. The objective was to examine the transformation of rhenium and molybdenum compounds under roasting conditions. Methodology involved using 10% excess slaked lime over the stoichiometric requirement at a roasting temperature of 600 °C for 2 hours. The results indicate that molybdenum within
Leaching of copper oxide with different acid solutions
N. Habbache, N. Alane
In this study, the dissolution of CuO in HCl, H2SO4, HNO3 and citric acid solutions was investigated in a batch reactor employing parameters expected to affect the dissolution rate of copper such as stirring speed, temperature and acid concentration. It was found that 99.95% of copper was dissolved after 14 min with inorganic acids at 0.5 M, 25◦ C and l/s = 10 ml/g while more drastic operation con
CHALCOPYRITE LEACHING IN ACID MEDIA: A REVIEW
Grozdanka D. Bogdanović, Sanja Petrović
In the modern practice of copper production, increasing attention is directed towards the treatment of low-percentage sulphide ores that conventional methods cannot process. Particularly, processes to obtain copper from complex sulphide concentrates, unsuitable for pyrometallurgical approaches, are under investigation. The extraction of copper from such raw materials is often achieved through leac
Extraction of copper from complex carbonaceous sulfide ore by direct high-pressure leaching
Labone L. Godirilwe, Refilwe S. Magwaneng
The increase of impurities and complexity of copper ores are among the recent challenges in the mining industry. Complex carbonaceous sulfide ores are extremely difficult to treat due to their mineralogical complexity and impurities of organic carbon and carbonates. This study focuses on the development of a hydrometallurgical process for efficient copper extraction from complex carbonaceous sulfi
Copper Recovery from Silicate-Containing Low-Grade Copper Ore Using Flotation Followed by High-Pressure Oxidative Leaching
Baisui HAN, Batnasan ALTANSUKH
In this paper, we present the results for recovery of copper from silicate-containing low-grade copper ore using flotation followed by atmospheric and high-pressure oxidative leaching. The objective of this study is to address the challenges associated with low-grade copper ores, particularly focusing on the recovery of copper while managing the increasing impurities present in the ores. The metho
G A LV A N IC EN H A N C EM EN T FO R H IG H PR ESSU R E LEA C H IN G O F C H A LC O PY R ITE
D.H. Kim, W.J. Kim
This study was conducted to evaluate the galvanic enhancement of the pressure oxidation (POX) leaching of a chalcopyrite/chalcocite concentrate, which is believed to take place via a redox reaction. Cu recoveries of > 90% could be achieved during POX leaching of this chalcopyrite/chalcocite concentrate at 200 °C and 0.7 MPa initial oxygen pressure within 2 h in a pressure reactor lined with titani
SCORODITE IN THE CESL PROCESS FOR COPPER-ARSENIC CONCENTRATES
K. Mayhew, H. Salomon-De-Friedberg
The increasing proportion of arsenic-bearing copper concentrates in the supply to the copper industry presents significant challenges for miners and smelters, as existing blending strategies to reduce average arsenic levels are becoming unsustainable. This study evaluates the CESL Cu-As Technology as a viable alternative to traditional smelting processes, which has benefits including simultaneous
Leaching Practices at Mantos Blancos
G. Tapia, R.J. Kelley
Empresa Minera de Mantos Blancos S.A. operates two copper mines in Chile: Mantos Blancos and Mantoverde. This study aims to define the leach processes suitable for each ore type by conducting extensive metallurgical testwork during the feasibility study of both projects. The methodology involved the selection of a combination of heap and dump leaching for Mantoverde, while a modified vat leach ope
Leaching of Mixed Oxide/Sulfide Copper Ores and the Shrinking Core Model
R. J. Roman
The results of column leaching tests on three different mixed oxide/sulfide ores from a Chilean deposit are presented. The samples included varying ratios of oxide copper minerals to chalcocite and chalcopyrite. The findings from the column leach tests are analyzed through the lens of the shrinking core model for coarse particle leaching. Both copper recoveries from the oxide and sulfide minerals
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
HYDROCOPPER® FOR TREATING VARIABLE COPPER CONCENTRATES
L. Haavanlammi, K. Hietala
The Outokumpu HydroCopper® process is a chloride based atmospheric leaching process alternative that can treat a variety of different concentrates. Chalcopyrite and other copper sulfides can effectively be leached under atmospheric pressure in strong, aggressive chloride solution using copper (II) ions as oxidant. Impurities are removed from the solution as carbonates and ion exchange. Copper is p
Mass transfer
Jamin Koo
This document presents a comprehensive overview of mass transfer, with a specific focus on leaching and extraction processes widely used in the chemical engineering field. The objective of the lecture is to educate students on the effectiveness and application of leaching as a separation method compared to other techniques, such as distillation. The methodology involves a detailed analysis of the
SEPARATION OF COPPER FROM A LEACHING SOLUTION OF PRINTED CIRCUIT BOARDS BY USING SOLVENT EXTRACTION WITH D2EHPA
Mónica Maria Jiménez Correa, Flávia Paulucci Cianga Silvas
Global generation of waste electrical and electronic equipment (WEEE) is increasing quickly. This paper describes a combined hydrometallurgical route (sulfuric oxidant leaching + solvent extraction) to recover copper from printed circuit boards (PCBs). A non-magnetic fraction from comminuted PCBs was used to perform leaching tests at 75ºC for 6 hours in an oxidizing media (sulfuric acid + hydrogen
CURRENT STATUS OF COPPER LEACHING AND RECOVERY IN THE U. S. COPPER INDUSTRY
W. Joseph Schlitt
This chapter reviews the current status of copper leaching and recovery operations in the United States, highlighting the significance of these techniques within the copper industry. The objective is to analyze the contributions of leach operations to total mine output and provide a comprehensive understanding of the evolution of these processes. Methodologically, the text employs a historical per
Copper heap leaching at San Manuel
J.G. Jenkins
This paper discusses the development and operation of Magma Copper Company's heap leaching facility at San Manuel, which has been operational since May 1986. The objective of the study was to evaluate the feasibility and efficiency of copper extraction from the oxide ore body of the San Manuel deposit, particularly as it became available for development in the early 1980s. A comprehensive testing
Ammonia Leaching: An Alternate Route for Copper Recovery
Xu Chuanhui, R Newell
The use of ammonia as a leaching agent in the recovery of copper from ores and concentrates has a number of potential benefits, including the ability to treat ores with acid-consuming gangue, non-corrosivity, the insolubility of iron in solution, and increased selectivity. This paper reviews both historical and contemporary applications of ammonia-based leaching systems for copper recovery and pre
A new Leaching System, Sheta Extractor
M. E. Sheta
This study introduces a novel leaching system known as the Sheta Extractor, designed to address the technical challenges of moving crushed solid ores against leaching solutions in a continuous countercurrent manner. The primary objective was to develop a practical solution for efficient uranium leaching from a coarse-grained fraction of uranium mineralized granite. The methodology involved a uniqu
Mass Transfer-I
Prof. Harsh B. Shukla, Prof. Upasana T. Singh
The course curriculum for Mass Transfer-I aims to develop competencies in students enrolled in the Chemical Engineering diploma program during their 4th semester. The rationale behind the curriculum is to facilitate learning outcomes related to mass transfer operations, which are critical in both the preliminary purification of raw materials and the final separation of products in chemical plants.
USA Attachment 08
H. A. van der Sloot, J. C. L Meeussen
This review comprehensively examines the physical and chemical aspects of leaching assessments, particularly focusing on stabilised municipal solid waste incineration (MSWI) fly ash. The objective is to provide a detailed understanding of the leaching processes and the associated factors influencing contaminant release. The methodology involves a synthesis of existing research, experimental result
The leaching of chalcopyrite with ferric sulfate and ferric chloride
D. L. Jones, E. Peters
The leaching of natural chalcopyrite was investigated using ferric sulfate and ferric chloride solutions, highlighting the different chemical reactions involved. Notably, ferric chloride was identified as a more efficient leaching reagent, with a substantially increased leaching rate linked to finer particle sizes and higher iron concentrations. Unlike ferric sulfate, which preferentially leached
Solution Mining A review
D. D. Rabb
This paper discusses solution mining, a method originally defined for the dissolution of soluble salts, which has evolved to encompass various techniques including heap leaching and in-place leaching. The objective is to review the expanded definition and application of solution mining, particularly for low-grade minerals and waste recovery. The methodology involves analyzing the chemical processe
MME09MT 1403 PEMUNIT PROCESSES IN HYDROMETALLURGY LEACHING, PURIFICATION OF LEACH LIQUOR
SWETA SUMAN, ADITYA KUMAR JHA
Hydrometallurgy is an important technique within extractive metallurgy that enables the recovery of metals from ores through aqueous solutions. This paper aims to provide a comprehensive overview of unit processes involved in hydrometallurgy, particularly focusing on leaching and purification of leach liquor. A systematic methodology is presented that includes four key steps: leaching, separation
Lectures Mass Transfer 2
Ahmed Daham
This chapter provides an in-depth overview of solid-liquid extraction, specifically the leaching process, which involves the separation of a solute from a solid mixture by dissolving it in a liquid phase. The primary objective is to delineate the leaching process and identify significant factors influencing extraction rates including particle size, solvent choice, temperature, and fluid agitation.
ELECTROCHEMISTRY AND MINERAL DISSOLUTION
Fathi Habashi, Ahmet Deniz Bas
The process of leaching semiconducting minerals such as PbS and ZnS has garnered significant attention from hydrometallurgy researchers since the early 1950s, leading to speculation about the formation of intermediate surface complexes that could not be identified through traditional physicochemical techniques. The introduction of electrochemical theory in the late 1960s compared the leaching proc
The Direct Leaching of Nickel Sulfide Flotation Concentrates – A Historic and State-of-the-Art Review Part I: Piloted Processes and Commercial Operations
Nebeal Faris, Mark I. Pownceby
The extraction of nickel (Ni) from sulfide resources commences with flotation to produce a concentrate which is then smelted to create a nickel-enriched phase called matte, further refined to produce pure Ni products along with by-products such as cobalt (Co), copper (Cu), and precious metals. Despite the technological robustness of the traditional concentrate smelting-matte refining process, it i
A Study on the Combined Flotation–Roasting–Leaching Process for Treating High-Carbon Gold Ore and Its Kinetics
Yongcheng Zhou, Wenping Chen
Direct cyanide leaching of high-carbon gold ores typically results in poor gold extraction due to the “preg-robbing” effect of carbonaceous matter. This study investigates a refractory high-carbon gold ore from Laos. Based on detailed process mineralogy that identified the occurrence state of gold and the distribution of harmful impurities, a combined process consisting of flotation pre-concentrat
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
2020 Meshram Organic acid leaching of copper converter slag
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 (
2017 Wang Manganese leaching from semi oxidized ores with sucrose
Yuhong Wang, Shenglong Jin
The extraction of manganese from a semi-oxidized manganese ore was investigated with sucrose as the reducing agent in dilute sulfuric acid medium. The kinetics of leaching manganese from the complex ore containing MnCO3 and MnO2 was also investigated. The effects of sucrose and sulfuric acid concentrations, leaching temperature and reaction time on the total Mn (TMn), MnO2 and MnCO3 leaching were
An Electrochemical and Leach Study of the Oxidative Dissolution of Chalcopyrite in Ammoniacal Solutions
Thandazile Moyo
Chalcopyrite is the most abundant copper sulphide and is extremely stable, which makes it resistant to traditional hydrometallurgical treatment methods, particularly atmospheric leaching. With the decline in ore grades and rising costs associated with concentration processes, there is a compelling need to revisit more economical and environmentally friendly hydrometallurgical options, particularly
2003 Takashi Yoshida Leaching of Zinc Oxide in Acidic Solution matertrans.44.2489
Takashi Yoshida
The leaching mechanism of zinc oxide is essential for understanding the zinc smelting process and developing new zinc recycling methods. This study aimed to investigate the leaching of zinc oxide from electric arc furnace dust (EAF dust) using hydrochloric acid and sulfuric acid solutions. Kinetic leaching tests were conducted with variations in pH, temperature, leaching time, and the rotating spe
Monosodium Glutamate as Selective Lixiviant for Alkaline Leaching of Zinc and Copper from Electric Arc Furnace Dust
Erik Prasetyo, Corby Anderson
The efficacy of monosodium glutamate (MSG) as a lixiviant for the selective and sustainable leaching of zinc and copper from electric arc furnace dust was tested. Batch leaching studies and XRD, XRF and SEM-EDS characterization confirmed the high leaching efficiency of zinc (reaching 99%) and copper (reaching 86%) leaving behind Fe, Al, Ca and Mg in the leaching residue. The separation factor (con
2026 Zou Battery metals and impurities in black mass leaching
Yuanmin Zou
With the global transition toward sustainable energy systems, lithium-ion batteries (LIBs) have become indispensable in portable electronics, electric vehicles, and renewable energy storage. Nonetheless, the rapid accumulation of spent LIBs presents environmental, safety, and resource challenges. Efficient recycling and recovery of critical materials like Co, Li, Ni, Cu, and graphite are therefore
2026 Ganovska Eh pH diagrams for rare earth processing
Ema Gánovská, Martin Sisol
Rare earth elements (REEs), including yttrium, scandium and lanthanides, are essential for advanced technologies, particularly in electronics, defense and renewable energy systems. The main primary REE sources include bastnaesite, monazite and ion-adsorption clays, while secondary sources comprise permanent magnets, phosphors, LEDs and other technological waste. The growing demand, together with C
2025 Zhang Hydrometallurgical recycling material and energy flow
Yifei Zhang, Valentin Mussehl
The exponential growth of global electric vehicle deployment has precipitated a critical need for the sustainable recycling of end-of-life lithium-ion batteries (LIBs), particularly nickel–cobalt–manganese (NCM) ternary cathodes, which dominate the retired battery stream. This study establishes an integrated Aspen Plus-based hydrometallurgical process model, focusing on “acid dissolution–LiOH prec
2024 Zou NMC black mass leaching with LFP
Yuanmin Zou, Alexander Chernyaev
This study focuses on the effect of an emerging source of waste, lithium iron phosphate (LFP) cathode materials, on the hydrometallurgical recycling of the currently dominant industrial battery waste that is rich in transition metals (Ni, Co, Mn, and Li). The effects of the dosage of LFP, initial acidity, and timing of LFP reductant addition were investigated in sulfuric acid (H2SO4) leaching (t =
2025 Partinen Sulfate and chloride leaching of lithium ion batteries
Jere Partinen
Maailmanlaajuiset pyrkimykset fossiilisista polttoaineista puhtaampiin teknologioihin siirtymiseksi ovat kasvattaneet akkujen merkitystä huomattavasti, mikä on arkielämässä näkynyt erityisesti viime vuosina kasvaneena sähköautojen määränä. Tämä väitöskirja tutkii hydrometallurgisen prosessin liuotusvaihetta, joka on oleellinen osa tehokasta akkujen kierrätystä. Liuotuskokeita suoritettiin sulfaatt
Li Extraction from a-Spodumene Concentrate via Carbonizing Calcination
Katerina Maliachova, Nikolaos Doukas
The conventional lithium extraction method involves the calcination of a-spodumene at 1050 ◦C so that it can be converted to the more-reactive b-spodumene and then a sulfuric acid roasting step at 250 ◦C. Lithium is finally extracted via leaching with water. This method is energy-intensive, leading to high capital and operational costs. In this study, the direct calcination of a-spodumene with the
An Initial Electrochemical Study Into the (Bio)Leaching of Chalcopyrite
Mpho Namane, J.Petersen
This thesis presents an initial electrochemical study aimed at understanding the (bio)leaching processes of chalcopyrite, a significant copper-bearing mineral. The objective of the study was to explore the electrochemical behavior of chalcopyrite in various leaching environments, assessing how different conditions affect its leaching efficiency. Methodologically, the research employed a series of
On the Use of Amino Acids to Leach Precious Metals from Primary and Secondary Resources
Simbarashe Fashu, Aaron Mukuya
During hydrometallurgical processing of precious metals, the leaching process is the critical stage mainly contributing to environmental pollution problems. The most important process variables affecting leaching kinetics are temperature, lixiviant concentration, solid-to-liquid ratio, presence of catalysts and synergists, and the type of oxidant. There are significant efforts to replace harmful l
Recovery of Cu and Fe from a Sphalerite Concentrate by the MnO2–KI Leaching Oxidation System
Aleksandar Jovanović, Dimitrije Anđić
This study examined the leaching behavior of copper and iron from a sphalerite concentrate in sulfuric acid utilizing an ensemble MnO2–KI oxidizing system. The temperature was shown to significantly influence the leaching kinetics, with the efficiency notably improving between 40 ◦C and 80 ◦C. The introduction of KI affected the balance between sulfur passivation and oxidant availability, facilita
Studies on the Hydrometallurgical Transfer of Lead, Copper, and Iron from Direct-to-Blister Copper Flash Smelting Slag to Solution Using L-Ascorbic Acid
Krzysztof Gargul, Arkadiusz Pawlik
This study explored the behavior of lead, copper, and iron during the leaching process of flash smelting slag from direct-to-blister copper flash smelting using l-ascorbic acid solutions. Flash smelting slag is generated in considerable quantities by various copper smelters worldwide. One drawback of the single-stage flash smelting technology for copper concentrates is the production of large quan
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 (
Application of Mixed Potential Theory to Leaching of Mineral Phases
César A. C. Sequeira
Leaching is a central unit operation in the hydrometallurgical processing of minerals, which often occurs by means of electrochemical reactions. The objective of this study is to apply mixed potential theory to elucidate the kinetics involved in oxidative and reductive leaching processes. The methodology involves an examination of electron-conducting phases such as native metals, selected oxides,
Direct Acid Leaching of Sphalerite: An Approach Comparative and Kinetics Analysis
Nallely G. Picazo-Rodríguez, Ma. de Jesus Soria-Aguilar
The present work reports the direct leaching of zinc from a sphalerite concentrate in acid media. Lab-scale and pilot-scale experiments were conducted in atmospheric-pressure and low-pressure reactors, respectively. Leaching of zinc and precipitation of iron was achieved in the same stage using different reagents like Fe3+, O2, O3, and Fe2+ (which is continuously oxidized in the leaching solution
Hydrometallurgical Process and Kinetics of Leaching Manganese from Semi-Oxidized Manganese Ores with Sucrose
Yuhong Wang, Shenglong Jin
The extraction of manganese from a semi-oxidized manganese ore was investigated with sucrose as the reducing agent in dilute sulfuric acid medium. The kinetics of leaching manganese from the complex ore containing MnCO3 and MnO2 was also investigated. The effects of sucrose and sulfuric acid concentrations, leaching temperature and reaction time on the total Mn (TMn), MnO2 and MnCO3 leaching were
Selective Removal of Arsenic and Antimony from Pb-Ag Sulfide Concentrates by Alkaline Leaching: Thermodynamic and Kinetic Studies
Walter Blanco-Vino, Gerardo Zamora
Arsenic and antimony are impurities that reduce the economic value of concentrates due to the environmental problems they cause. The removal of these impurities by hydrometallurgical means has been highly studied for sulfide copper concentrates using different leaching agents in an alkaline medium (NaClO, H2O2, NaOH, Na2S, NaHS, and S). For a lead–silver concentrate consisting of galena, sphalerit
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
PRESSURE LEACHING OF ÇALDAĞ LATERITIC NICKEL ORE
Mehmet Ali Recai Önal
This thesis explores the pressure leaching process for extracting nickel from Çaldağ lateritic nickel ore, aiming to enhance the efficiency and effectiveness of metal recovery. The objective focuses on optimizing the operational parameters such as temperature, pressure, and acidity levels to achieve higher nickel yields. A systematic experimental approach was employed, utilizing a series of labora
Solvometallurgy: An Emerging Branch of Extractive Metallurgy
Koen Binnemans, Peter Tom Jones
This position paper introduces the reader to the concept of solvometallurgy, the term used to describe the extraction of metals from ores, industrial process residues, production scrap, and urban waste using non-aqueous solutions. Here, non-aqueous is not used to imply anhydrous, but rather a low water content. The unit operations include solvent leaching, separation of the residue, purification o
Thermodynamics and Kinetics of Sulfuric Acid Leaching Transformation of Rare Earth Fluoride Molten Salt Electrolysis Slag
Lijie Chen, Jiacong Xu
In the realm of rare earth element recovery through molten salt electrolysis, the loss of approximately 8% in waste molten salt slag poses significant challenges. Despite the pressing need for effective recycling technologies for rare earth molten salt slag, scant research has addressed this concern, necessitating a novel approach for its treatment. This study investigates the recovery of rare ear
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
Acidic leaching of scheelite concentrate and production of hetero-poly-tungstate salt
Sebahattin Gurmen, Servet Tõmur
The aim of this study is to investigate the utility of adding a chelating agent during hydrochloric acid leaching of low-grade scheelite concentrates obtained from Uludag, Bursa Turkey. Examined parameters included leaching conditions, selective precipitation of tungsten salt from the acidic leach solution in which tungsten exists as hetero-poly-tungstate, optimum precipitation conditions, and the
Investigation of chrome( VI) oxide production from chromite concentrate by alkali fusion
Ciineyt Arslan, Gijkhan Orhan
The possibility of producing chrome(VI) oxide from domestic chromite concentrates was investigated by carrying out laboratory-scale alkali fusion and water leaching experiments. The effects of temperature, the amount of NaOH added, and the flow rate of air on chromium extraction efficiency in an alkali fusion step were examined. Fusion product was leached with water to produce a clean Na2CrO4 solu
BENEFICIATION OF BRASS ASHES
S. Timur, I. Duman
Slags formed during brass smelting contain a significant amount of metallic value. The glassy and oxidized portion of the ground slag, usually referred to as "brass ash", consists of compounds such as ZnO, ZnO-SiO2, Cu-Zn, CuO, Cu and Zn/Cu/B oxide, and its colored-metal content may vary between 28-52% Zn and 8-16% Cu. These ashes are classified as harmful wastes due to their high Zn content and a
Acidic leaching of scheelite concentrate and production of hetero-poly-tungstate salt
Sebahattin Gurmen, Servet Tõmur
The aim of this study is to investigate the utility of adding chelating agent during hydrochloric acid leaching of low-grade scheelite concentrates, obtained from Uludag, Bursa Turkiye. Examined parameters were as follows; leaching conditions, selective precipitation of tungsten salt from the acidic leach solution in which tungsten exists as hetero-poly-tungstate, the optimum precipitation conditi
BENEFICIATION OF BRASS ASHES
S. Timur, I. Duman
Slags formed during brass smelting contain a significant amount of metallic value. The glassy and oxidized portion of the ground slag, usually referred to as "brass ash", consists of compounds such as ZnO, ZnO-SiO2, Cu-Zn, CuO, Cu and Zn/Cu/B oxide, and its colored-metal content may vary between 28-52% Zn and 8-16% Cu. These ashes are classified as harmful wastes, due to their high Zn content, and