Nickel
Browse 60 curated documents about nickel 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 nickel 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.
ROASTING REDUCTION STUDY OF GREEK NICKELIFEROUS LATERITES
Emmanuel N. Zevgolis, Charalabos Zografidis
In the present work, a reduction roasting experimental study of Greek nickeliferous laterite samples with a gaseous reducing mixture – CO:N2- is presented. The effect of parameters such as temperature, ore grain size, and composition of the reducing mixture were examined. It is deduced that the reducibility of intermediate type laterite sample, where iron appears mainly in the form of goethite (α-
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
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
Field-Selective Adsorption of Saccharin on Nickel: Mechanistic DFT Insights into Solvation, Protonation, and Coating Morphology
Aylar G. M. Ghashghaei, Mahboubeh Khorrami
The molecular mechanisms by which organic additives such as saccharin control microstructure in nickel electrodeposition remain inadequately understood, particularly the role of the intense interfacial electric field. This study employs density functional theory (DFT) calculations to elucidate the field dependent adsorption behavior of neutral saccharin and its deprotonated anion (saccharinate) on
Characterization of a Nickel Sulfide Concentrate and Its Implications on Pentlandite Beneficiation
Linda D. Ayedzi, Massimiliano Zanin
In anticipation of future demands, a comprehensive understanding of the chemical and mineralogical characteristics of nickel-bearing minerals is a prerequisite to devising effective nickel beneficiation methods. Of particular importance are markers in the mineralogy of the flotation concentrate that inform beneficiation strategies to improve concentrate grades, increasing both the marketability an
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
Reaction Sequences in Flash Smelting and Converting Furnaces: An In-depth View
PEKKA TASKINEN, ARI JOKILAAKSO
Flash smelting and flash converting have established themselves as key technologies in the processing of copper and nickel sulfide ores, reflected in the high online availability, yield efficiency, and low energy requirements. This study addresses the operational intricacies linked to furnace design and maintenance, emphasizing the interconnectedness of suspension oxidation, fluxing, fluid dynamic
Factors Affecting the Upgrading of a Nickeliferous Limonitic Laterite Ore by Reduction Roasting, Thermal Growth and Magnetic Separation
Filipe Rodrigues, Christopher A. Pickles
There is considerable interest in the development of new processes to extract the nickel from the oxidic nickeliferous laterite deposits, as the global nickel sulphide resources are rapidly becoming more difficult to access. In comparison to sulphide ores, where the nickel-containing mineral can be readily concentrated by flotation, nickel laterites are not amenable to significant upgrading, due t
Optimal Combination of Calcination and Reduction Conditions as well as Na2SO4 Additive for Carbothermic Reduction of Limonite Ore
Guan-Jhou Chen, Jia-Shyan Shiau
The optimal carbothermic reduction parameters of limonite ore and the influence of calcining temperature on these were investigated. In addition, the impact of the addition of Na2SO4 on limonite ore which had been calcined before reduction at optimal carbothermic conditions was also examined. Various analytical techniques including XRD analysis, BET-specific surface area analysis, bromine methyl a
Pyrometallurgical Methods for Processing Lateritic Nickel Ores and Evaluation of Their Application for Processing Nickel Ores in Kazakhstan: A Review
Yerbol Shabanov, Yerlan Zhumagaliyev
The depletion of global reserves of high-quality sulfide nickel deposits, coupled with the steady growth of nickel demand, has led to increased interest in the processing of oxidized (lateritic) nickel ores, including deposits with significant resource potential in the Republic of Kazakhstan. This paper provides an overview of global nickel ore reserves and their distribution, as well as the major
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 (
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
Thermodynamics of the Reduction Roasting of Nickeliferous Laterite Ores
R. Elliott, C. A. Pickles
The global nickel sulphide resources are becoming more difficult to mine and, as a result, there is increasing interest in the current and future development of the oxidic nickel laterite deposits. In comparison to the sulphide ores, the nickel laterites cannot be readily upgraded by conventional means, and growing attention is being focused on the development of new methods for processing these o
An Investigation of High-Temperature Precipitation in Powder-Metallurgy, Gamma/Gamma-Prime Nickel-Base Superalloys
S.L. SEMIATIN, S-L. KIM
The high-temperature-precipitation behavior of a typical powder-metallurgy, gamma-gamma-prime, nickel-base superalloy (LSHR) was determined to develop and validate a quantitative fast-acting model. A series of experiments including supersolvus solution treatment followed by continuous cooling at rates typical of those experienced during the manufacturing of full-scale components was conducted for
The Prospect of Recovering Vanadium, Nickel, and Molybdenum from Stone Coal by Using Combined Beneficiation and Metallurgy Technology Based on Mineralogy Features
Miao Wang, Liulu Cai
Black shale ore contains rich strategic metal resources such as vanadium, nickel, and molybdenum, but due to its complex composition, it is currently only used in the vanadium extraction industry. Metals such as nickel and molybdenum have not been effectively recovered, resulting in environmental pollution and resource waste. Using mineralogical features and a combination of beneficiation and meta
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
Métallurgie Technologie des Batteries Chapitre X : Batteries Nickel-Cadmium (Ni-Cd)
A. B. C, D. E.
Ce chapitre traite de la technologie des batteries nickel-cadmium (Ni-Cd) en mettant l'accent sur le rôle des électrodes et de l'électrolyte dans les processus électrochimiques. L'objectif est de comprendre les mécanismes de charge et de décharge des batteries Ni-Cd, en particulier la fonction de l'électrode positive NiOOH, de l'électrode négative Cd et de l'électrolyte KOH. La méthodologie impliq
REPUBLIQUE DEMOCRATIQUE DU CONGO
n/a
Cet article examine le stockage d'énergie des batteries Li-ion et Ni-MH, ainsi que leurs impacts environnementaux, notamment la toxicité du cadmium. L'objectif est de comparer les méthodes de recyclage des batteries, en mettant l'accent sur la pyrométallurgie et l'hydrométallurgie. La méthodologie inclut l'analyse des demi-réactions de décharge des batteries et des avantages et inconvénients des d
Structural modifications to nickel cermet anodes in fuel cell environments
Douglas G. Ivey, Edward Brightman
Restructuring of Ni in cermet anodes of solid oxide fuel cells (SOFCs) has been studied using both bulk fuel cells and thin foil anodes. The bulk cells were button cells (23 mm in diameter) with cermet anodes (30–70 /H9262m thick) made up of nickel and gadolinium-doped ceria (Ni/CGO). The cells were operated (under current load) at 700◦ C in moist H2 or moist H2 with low levels of H2 S. Scanning e
On the Active Surface State of Nickel-Ceria Solid Oxide Fuel Cell Anodes During Methane Electrooxidation
Vasiliki Papaefthimiou, Maxim Shishkin
Fuel cells are devices that directly convert fuels into electricity, with solid oxide fuel cells (SOFCs) being particularly attractive due to their high efficiency and fuel flexibility. The objective of this study is to provide in situ experimental evidence of the active surface oxidation state and composition of nickel/gadolinium-doped ceria (Ni/GDC) anodes during methane electrooxidation using r
Mathematical modeling of the operation of SOFC Nickel-cermet anodes
D. Presvytes, C. G. Vayenas
A surface diffusion–reaction model is developed and solved to describe the steady-state operation of Nickel-cermet anodes in solid oxide fuel cells. The model accounts for the migration (backspillover) and diffusion of oxygen ions from the solid electrolyte onto the nickel surface and the concomitant reaction with the fuel over a finite reaction zone extending from the three-phase boundaries onto
In situ Reduction and Oxidation of Nickel from Solid Oxide Fuel Cells in a Transmission Electron Microscope
A. Faes, Q. Jeangros
Environmental transmission electron microscopy was utilized to characterize in situ the reduction and oxidation processes of nickel from a Ni/YSZ solid oxide fuel cell anode support within the temperature range of 300-500°C under low hydrogen pressure. The findings indicate that reduction initiates at the NiO/YSZ interface and progresses to the center of the NiO grain, with higher temperatures per
Electrochemical performance of nanocrystalline nickel/gadolinia-doped ceria thin film anodes for solid oxide fuel cells
Ulrich P. Muecke, Kojiro Akiba
Nickel oxide/Ce0.8Gd0.2O1.9 −x (NiO/CGO) films were deposited by spray pyrolysis and pulsed laser deposition on polished CGO electrolyte pellets to analyze their electrochemical performance as anodes in solid oxide fuel cells (SOFCs). The objective was to evaluate the relationship between microstructure and performance of Ni/CGO thin film anodes. The thickness of the as-deposited films ranged from
Design of Active Sites on Nickel in the Anode of Intermediate-Temperature Solid Oxide Fuel Cells using Trace Amount of Platinum Oxides
Andrii Rednyk, Toshiyuki Mori
Solid oxide fuel cells (SOFCs) provide efficient energy conversion but face challenges related to their operating temperature and internal resistance. This study investigates the design of new active sites on nickel surfaces in the anode of intermediate-temperature solid oxide fuel cells (IT-SOFCs) through the deposition of trace amounts of platinum oxide (PtOx), followed by activation in a hydrog
Catalytic activity of bimetallic nickel alloys for solid-oxide fuel cell anode reactions from density-functional theory
Wei An, Brett I. Dunlap
We present density-functional theory calculations of the chemisorption of atomic species O, S, C, H and reaction intermediates OH, SH, and CH n (n = 1, 2, and 3) on M/Ni alloy model catalysts (M = Bi, Mo, Fe, Co, and Cu). The activity of the Ni alloy catalysts for solid-oxide fuel cell (SOFC) anode oxidation reactions is predicted, based on a simple descriptor, i.e., the binding energy of oxygen.
Nickel Electrodeposition on Silver for the Development of Solid Oxide Fuel Cell Anodes and Catalytic Membranes
Zadariana Jamil, Enrique Ruiz-Trejo
Nickel was electrodeposited on porous Ag/GDC (silver/Ce0.9Gd0.1O2-x) scaffolds and dense Ag/GDC composites for the fabrication of solid oxide fuel cell (SOFC) electrodes and catalytic membranes respectively. The objective of this study was to control the distribution and amount of nickel deposition on the Ag/GDC surfaces. A systematic cyclic voltammetry study was performed to understand the influe
Anode fabrication for solid oxide fuel cells: Electroless and electrodeposition of nickel and silver into doped ceria scaffolds
Zadariana Jamil, Enrique Ruiz-Trejo
A novel fabrication method using electroless and electrodeposited Ni/Ag/GDC for SOFC anodes is presented. First a porous Ce0.9Gd0.1O2/C0 x (GDC) scaffold was deposited on a YSZ electrolyte by screen printing and sintering. The scaffold was then metallized with silver using Tollens' reaction, followed by electrodeposition of nickel from a Watt's bath. The electrodes (Ni/Ag/GDC) were tested in both
Zn-Ni ALLOY COATINGS FROM ALKALINE BATH CONTAINING TRIETHANOLAMINE. INFLUENCE OF ADDITIVES.
Liana Maria Muresan, Julien Eymard
The study investigates the electrodeposition of Zn-Ni alloys from an alkaline bath using triethanolamine as a complexing agent for Ni2+ ions. Various brightening agents including polyethylene glycol (PEG), coumarin, piperonal, and vanillin were tested to evaluate their effects on the codeposition process and the corrosion resistance of the resulting coatings. The findings indicate that the electro
Electrodeposition of Zn–Ni coatings as Cd replacement for corrosion protection of high strength steel
A. Conde, M.A. Arenas
Electrodeposition of Zn–Ni coatings performed in acidic baths are not suitable for high strength steels due to their high susceptibility to hydrogen embrittlement. In this work, Zn–Ni coatings were deposited on a high strength steel (4340) upon stirring conditions from an alkaline bath. A complete characterisation of the coatings (corrosion, morphology and composition) has been accomplished, corre
Pulse plating of nickel: influence of electrochemical parameters and composition of electrolyte
M. Halmdienst, W. E. G. Hansal
In this paper, the influence of electrochemical parameters and the composition of the electrolyte on the properties of nickel deposits in pulse plating is discussed. The objective was to investigate how organic additives affect the characteristics and electrochemical behavior of a nickel sulphamate bath, derived from fundamental electrochemical experiments. The methodology involved conducting plat
PULSE PLATING OF Ni-Cu ALLOYS
M. CHERKAOUI, E. CHASSAING
This study investigates the effects of pulse plating parameters on the composition and characteristics of Ni-Cu alloy coatings deposited from a citrate bath. The objective is to understand how variations in pulse time and average current density control the deposit's composition. The methodology includes experimental analysis of microhardness, corrosion resistance, and roughness of the coatings pr
Nickel coating on high strength low alloy steel by pulse current deposition
S Nigam, S K Patel
Nickel is a silvery-white metal mostly used to enhance the value, utility, and lifespan of industrial equipment and components by protecting them from corrosion. Nickel is commonly used in the chemical and food processing industries to prevent iron from contamination. Since the properties of nickel can be controlled and varied over broad ranges, nickel plating finds numerous applications in indust
Effect of Nickel Pulse Electroplating Parameters on ST12 Steel
Hassan Nosrati, Seyed hadi Tabaian
Nickel coatings benefit from their high corrosion resistance and low porosity content. However, improving these properties seems to be necessary for special purposes which can be achieved through pulse plating. The most important parameters to enhance the surface quality of nickel pulse plating on ST12 steel have been discussed in this research. Morphology of the coatings has been investigated by
THE KINETICS OF NICKEL ELECTRODEPOSITION INHIBITION BY ADSORBED HYDROGEN AND ANIONS
E. CHASSAING, M. JOUSSELLIN
This study investigates the kinetics of nickel electrocrystallization through impedance measurements in strongly acidified chloride electrolytes and with additives such as 2 butyne 1,4 diol and sodium benzenesulfonate. In chloride solutions at pH 0.5, notable inductive effects and a distinct capacitive low-frequency feature were observed, contrasting with less acidified environments. The presence
The evaluation of nickel deposit obtained via Watts electrolyte at ambient temperature
Nur Azam Badarulzaman, Ahmad Azmin Mohamad
A series of electroplating works were conducted to investigate the best conditions for the electrodeposition of nickel on a mild steel substrate. The electrodeposition was performed at ambient electrolyte temperature with mild agitation and under current density ranging from 10 to 50 mA/cm². X-ray diffraction analysis confirmed the presence of a pure nickel coating, with specific peaks at 44.6, 51
Studies Regarding the Nickel Electrodeposition from Choline Chloride Based Ionic Liquids
Liana Anicai, Andreea Florea
This study investigates the electrodeposition of nickel from choline chloride-based ionic liquids, addressing the limitations of traditional aqueous electrolytes. The objective is to explore alternative electrochemical media that present less environmental toxicity while expanding the range of metals suitable for electrodeposition. Employing electrochemical techniques, the research evaluates the e
MODERN HIGH-SPEED ELECTROLYTES FOR ELECTROPLATING PROFILED NICKEL SEDIMENTS
M. Yu. Malkova, A. N. Zadiranov
The production of high-quality nickel cathode sediments significantly depends on the selection of appropriate electrolytes with special additives and soluble anodes. This study investigates the effectiveness of modern sulphate-chloride electrolytes based on methanesulfonic acid and nickel acetate, coupled with a boric acid buffer and micro-alloyed sulfur-soluble nickel anodes, for generating quali
Initial study of Nickel Electrolyte for EnFACE Process
Tri Widayatno, Sudipta Roy
Nickel electrolyte for a micro-pattern transfer process without photolithography, EnFACE, has been developed. Previous work on copper deposition indicated that a conductivity of ~2.7 Sm-1 is required. Electrochemical parameters of electrolyte i.e. current density and overpotential are also crucial to govern a successful pattern replication. Therefore, the investigation focused on the measurement o
Electroplating of nickel from acetate based bath – Hull Cell studies
K. R. Marikkannu, K. Surya Kala
This study investigates the electroplating of nickel onto steel substrates using an acetate-based bath containing nickel acetate, nickel chloride, boric acid, and acetic acid, focusing on various operating conditions such as bath composition, current density, and temperature. The objectives include optimizing deposition parameters via Hull Cell experiments and examining the effects of these parame
WHAT IS ELECTROLESS NICKEL?
Brenner, Riddell
Electroless nickel plating, a process that does not require electrical current or anodes, relies on autocatalytic deposition from an aqueous solution containing metal ions, a reducing agent, and stabilizers. This unique method permits uniform coating of internal surfaces of various parts, a feat challenging for traditional electroplating. Although electroless nickel (EN) plating emerged in the 194
Effects of saccharin and quaternary ammonium chlorides on the electrodeposition of nickel from a Watts-type electrolyte
Aleksander Ciszewski, Szymon Posluszny
The effect of the presence of quaternary ammonium chlorides (QACl) and saccharin on various electrodeposition parameters for nickel deposition on a stainless steel cathode from a Watts-type plating bath was investigated. The parameters included cathodic current efficiency, throwing power of the bath, cathodic polarization, crystal orientation, and quality of the deposit. The following additives we
Effect of Some Process Variables on Nickel Electroplating of Low Carbon Steel
Daniel OLORUNTOBA, Oghenedoro EGHWUBARE
This research work investigated the effect of current density, bath concentration, bath solution volume, and electroplating time on nickel electroplating of low carbon steel. Varying voltage between 0.3 and 0.8 V, bath concentration between 0.27 g/cm3 (0.79 mol/dm3) and 0.35 g/cm3 (1.02 mol/dm3), electroplating time between 10 and 30 minutes, and bath solution volume between 200 and 700 cm3, the e
Study of Glycerol as an Additive in Ni-Mo Electrodeposition
Javan Grisente dos Reis da Costa, Cláudia Lisiane Fanezi da Rocha
This paper evaluates the effect of adding glycerol to the electrodeposition bath on the deposition efficiency and characteristics of Ni-Mo coating in concentrations ranging from 0.07 to 0.82 mol.L-1. Evaluation of the corrosion resistance was performed by means of weight loss tests in four different periods of immersion. Electrochemical techniques, such as obtaining polarization curves, linear pol
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
Corrosion behaviour of zinc–nickel coatings, electrodeposited on steel
M. Gavrila, J.P. Millet
The electrochemical behaviour of sacrificial zinc–nickel coatings, electrodeposited onto low alloy steel is studied in a neutral, saline, aqueous environment, considering different preparation conditions such as the nature of the bath, density of electrodeposition current, degassing, and chromate passivation. Stability of the sacrificial properties is determined through open circuit potential meas
Characterization, corrosion resistance and hardness of rapidly solidified NieNb alloys
Conrado R.M. Afonso, Katherine Martinez-Orozco
In this research various Ni(-x)Nb (x¼ 10, 15, 20, 30, 40, 45, 52 and 57 wt %) alloys samples were rapidly solidified (RS) by using copper mold casting. High purity elements were used to produce the RS NieNb samples. Even though NieNb alloys have been extensively investigated over the past decades regarding thermodynamics, phase diagram and heat treatment; as-solidified microstructures and properti
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
Cr(V I) Ion Reduction Reaction on Nickel and Stainless Steel Electrodes in Acid Medium
IOANA MAIOR, GABRIELA ELENA BADEA
The reduction of Cr(VI) ion in 0.5 M H2SO4 deaerated solutions with different concentrations of K2CrO4 on nickel and 18Cr-10Ni stainless steel electrodes has been studied using the potentiostatic polarization technique, analyzing the effects of chromate concentration. Kinetic parameters including Tafel slope, charge transfer coefficient, and limiting current density have been evaluated. The resear
Nickel recovery from the rinse waters of plating baths
G. Orhan, C. Arslan
An electrolytic process is applied to the de-metalization of rinse waters emerging from nickel-plating baths. The objective of this study was to investigate the optimum conditions for nickel recovery from these solutions. A series of experiments were conducted in a rotating packed cell (RollschichtzelleR), examining the effects of various parameters including the temperature and pH of the electrol
Rapid crystallization of amorphous silic
Petr Fojtík, Kateřina Dohnalová
A way in which thin films of hydrogenated amorphous silicon (a-Si:H) can be instantaneously crystallized at room temperature is reported. The metal-induced solid-phase crystallization (MISPC) method with nickel surface coverage is used. In comparison with previous reports on the MISPC of a-Si:H, the crystallization temperature is reduced by more than 350 °C. This is achieved by introducing two nov
Bioleaching of zinc and nickel from sili
I.M. Castro, J.L.R. Fietto
In this work, we investigated the role of bacteria from the genera Bacillus and Pseudomonas and fungi from the genera Aspergillus and Penicillium in the leaching process of two different silicates, calamine and garnierite. Since the results obtained with A. niger were better than those with different bacteria, a more detailed investigation of the leaching process with this microorganism was conduc
Synthesis of Complex-Alloyed Nickel Aluminides from Oxide Compounds by Aluminothermic Method
Victor Gostishchev, Ernst Ri
This paper deals with the investigation of complex-alloyed nickel aluminides obtained from oxide compounds by aluminothermic reduction. The aim of the work was to study and develop the physicochemical basis for obtaining complex-alloyed nickel aluminides and their application for enhancing the properties of coatings made by electrospark deposition (ESD) on steel castings, as well as their use as g
Metastable Ni7B3: A New Paramagnetic Boride from Solution Chemistry, Its Crystal Structure and Magnetic Properties
Hofmann, Kathrin, Kalyon, Nalan
We trapped an unknown metastable boride by applying low-temperature solution synthesis. Single-phase nickel boride, Ni7B3, was obtained as bulk samples of microcrystalline powders when annealing the amorphous, nanoscale precipitate that is formed in aqueous solution of nickel chloride upon reaction with sodium tetrahydridoborate. Its crystal structure was solved based on a disordered Th7Fe3-type m
Hydrogen Generation from Ammonia-Borane over NiB Amorphous Alloys Prepared from Aqueous Solution Based on Thermodynamic Prediction of Hidden Metastable of State
Ai Nozaki, Masashi Kuroda
Amorphous alloys are recognized for their potential to yield excellent catalytic activity owing to disordered atomic arrangements and an abundance of dangling bonds. This study investigates the thermodynamic properties of NiB amorphous alloys, specifically through the Gibbs energy of mixing and the activities of nickel and boron in the liquid phase at room temperature. The analysis revealed a neg
Formation of nickel aluminides by mechanical alloying and thermodynamics of interaction
V.K. Portnoy, A.M. Blinov
Structure and temperature stability of Ni-Al alloys obtained by mechanical alloying (MA) were studied using X-ray diffraction and differential scanning calorimetry (DSC). MA of Ni-Al powders produces the B2 phase for the composition range 40-61 at.% Ni, and a nanocrystalline supersaturated solid solution Ni(Al) in the range 65-85 at.% Ni. MA of Ni-Al leads to a nanocrystalline phase, probably with
The Estimation of Localized Corrosion Behavior of Ni-Based Dental Alloys Using Electrochemical Techniques
Daniel Mareci, Romeu Chelariu
This study investigates the electrochemical behavior of five non-precious nickel (Ni)-based dental casting alloys in acidified artificial saliva to understand their localized corrosion resistance. The objective is to evaluate the efficacy of these alloys compared to nickel using cyclic potentiodynamic polarization (CCP) and electrochemical impedance spectroscopy (EIS), with further observations th
Chemical and physical characterization of electrode materials of spent sealed Ni–Cd batteries
C.A. Nogueira, F. Margarido
The present work aimed at the chemical and physical characterization of spent sealed MONO-type Ni–Cd batteries, contributing to a better definition of the recycling process of these spent products. The electrode material containing essentially nickel, cadmium and some cobalt corresponds to approximately 49% of the weight of the batteries. The remaining components are the steel parts from the exter
The Transfer of Nickel Iron and Copper F
P. CHIN, P. J. SIDES
Oxides of Ni and Fe, and elemental Cu, which are constituents of candidate non-consumable anodes for the Hall-Heroult process, were dissolved in alumina-saturated cryolite melts. The fluoride melts were in turn contacted with molten aluminum. The transfer of these elements from the fluoride melt into the aluminum was incomplete. Ni, Fe, and Cu present in the melt, 55%, 63%, and 13%, respectively,