About
42
Publications
10,825
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
554
Citations
Citations since 2017
Publications
Publications (42)
High-temperature experimental thermodynamics and modeling are important for the design of efficient metallurgical processes. In many industrial processes, the operational efficiency and product quality have been strictly related to the operators’ experience; however, the optimum condition can now be determined better by applying increasingly advancin...
Urban areas are at the forefront of future sources of the technology metals. Urban mining involves collection and management of spent products and preprocessing and recovery of valuable materials. Recently, some cities in Europe signed the EU Green City Accord, an initiative to make cities greener, cleaner, and healthier. Technological developments...
Decarbonization of metal production is currently a unique challenge for the industry. To gain insights, environmental impacts of ferrochrome smelting technologies were estimated using simulation-based life cycle assessment. Two leading technologies: (1) Steel Belt Sintering-Submerged Electric Arc Furnace (SBS-SAF), and (2) Rotary Kiln-Submerged Ele...
Glycine has recently gained plenty of attention in gold processing as an alternative lixiviant to cyanide due to its non-toxicity, efficiency in metal dissolution as well as selectivity for valuable metals. This paper presents an investigation on the combination of agitated reactor leaching and recovery of gold from mildly refractory ore in cyanide...
Copper is the major impurity dissolved in silver electrorefining which potentially accumulates in the electrolyte during the process and co-deposits onto the cathode surface, decreasing the product quality. The study investigated the dissolution kinetics of copper in silver electrorefining as a function of wt%Cu in the industrial electrolyte ranges...
The thermal conductivity of various copper matte and fayalite slag was measured using laser flash analysis, a non-steady state measurement method. Industrial matte and slag samples were taken in such a way that their composition represented typical process conditions. Thermal conductivities for solid copper matte (average 64% Cu) were found to be f...
In this research, a hydrometallurgical method for recovery of copper from copper rich converter slag is investigated. The main copper containing phases of the slag are cuprite (Cu2O), delafossite (CuFeO2) and metallic copper (Cu). The study investigates the effect of particle size, temperature, acid concentration, agitation and leaching time under...
Currently, the first generation of solar panels are reaching their end-of-life, however so far, there is no best available technology (BAT) to deal with solar panel waste in terms of the optimized circular economy of metals. In this brief communication, electro-hydraulic fragmentation (EHF) is explored as an initial conditioning stage of photovolta...
Lithium-ion batteries are already playing a key role in the move from fossil fuels towards clean and renewable energy systems. This is because variabilities in renewable energy grids need to be supported by very stable storage mechanisms (batteries). In electric vehicles, lithium-ion batteries are also very important and determine applicability on...
The Ti-V-O system was studied experimentally from 700 °C to 1500 °C by high-temperature equilibration, quenching, scanning electron microscope and Energy-Dispersive X-Ray spectroscopy. The solubility of titanium in the slag is less than 3 mol% at 1500 °C and the vanadium solubility in the rutile phase reached a maximum of 7.8 mol% at 1400 °C. The t...
The Fe-V-O system in air was studied experimentally ranging from 700 °C to 1450 °C by high-temperature equilibration, quenching, scanning electron microscope and microprobe analysis. The thermodynamic evaluation was performed with FactSage 7.0. The solubility of V2O5(s) in Fe2O3(s) was described with the compound energy formalism. The properties of...
Full free download text at:
( https://authors.elsevier.com/a/1Wxao1IvWPrbxg )
Due to their high corrosion resistance and thermal stability, Cu-Ni-alloys have essential role in many materials engineering applications. Lead is an alloying element in these alloys although it may also be considered as an impurity in certain cases. In copper rich allo...
The current study demonstrates and proposes a new method for sustainable treatment of electric arc furnace (EAF) dust. The raw material is one of the largest and fast growing hazardous waste fractions produced. Globally, annual EAF production of steel generates more than 12 M tonnes of dust today. The dust is rich in Fe but also contains toxic and...
The manufacturing of modern electrical and electronic equipment (EEE) consumes large amount of scarce valuable metals. The small sized equipment such as smart phones have very high content of these valuable metals. However, their collection rate at End-of-Life (EoL) for recycling is currently very low. To address the prevailing issues related to re...
Recycling of valuable metals from secondary resources such as waste Li-ion batteries (LIBs) has recently attracted significant attention due to the depletion of high-grade natural resources and increasing interest in the circular economy of metals. In this article, the sulfuric acid leaching of industrially produced waste LIBs scraps with 23.6% cob...
In a race to save the planet of its rapidly depleting natural resources, the use of Secondary Raw Materials (SRMs) as replacements in several processes is currently intensively pursued. In fact, this is currently one of the European Union (EU)’s mandates. Valorization of SRMs is consistent with the circular economy, where resource efficiency is max...
In a race towards more sustainable usage of secondary raw materials, new approaches to deal with toxic and hazardous wastes, yet valuable, are playing a crucial role. This ‘closing the loop’ is also one of the action plans made by European Union (EU) in 2015 [1]. However, the action plan made by EU focuses mainly on plastics, food waste and critica...
In this article, current progress in urban mining related to e-waste recycling is reviewed and associated state-of-the-art recycling technologies are evaluated. As sufficient volume of e-waste is a limiting factor for its recycling economy, the need for the establishment of effective e-waste collection mechanisms, particularly for small sized End-o...
This study focuses on selective zinc and lead leaching from Electric Arc Furnace (EAF) dust in order to turn this major source of steel plant pollution into a recyclable Fe-rich feed material for the steel manufacturing process. The raw material investigated comprises of engineering steel plant EAF dust that contains zinc 33.2%, iron 17.9%, mangane...
![Fig. 3. Mechanisms for increased EoL EEE collection [1].](profile/Fiseha-Tesfaye/publication/305755282/figure/fig3/AS:518292693815296@1500582015776/Mechanisms-for-increased-EoL-EEE-collection-1_Q320.jpg)
Currently, increasing demand for valuable metals, complexities of the available raw materials, and earth’s intrinsic limitations pose a challenge to the whole valuable metals production system. The United Nations Environment Program (UNEP) is also calling for an urgent re-think of metals recycling practices as global demand for metals continues to...
E-waste management through traditional methods such as disposing in landfills, burning in incinerators or exporting abroad for disposal are no longer options due to the strict environmental regulations. Fortunately, the presence of valuable metals in the e-waste and increasing demand for the metals as well as complexities of the currently available...
The standard thermodynamic properties of the compound Ca2CuO3 were determined electrochemically by the Electromotive Force (EMF) method. The ternary phase Ca2CuO3 was synthesized from the pure oxides CaO and CuO at CaO saturation using a ceramic route. The EMF measurements were performed over a temperature range 973 ≤ T/K ≤ 1124. The standard Gibbs...
Phase equilibria of the system Cu–O–CaO–Al2O3 at copper saturation was experimentally investigated for the first time using equilibration techniques. Composition of quenched microcrystalline phases were quantified using Electron Probe Micro-Analyzer (EPMA). Liquidus and solubility data at 1150, 1250, and 1300 °C have been obtained based on four-pha...
The liquidus of the system Cu-O-Cr2O3 was experimentally investigated in air for the first time using equilibration techniques. The composition of glassy liquid oxide phase in equilibrium with CuCrO2 were quantified using Electron Probe Micro-Analyzer (EPMA). Liquidus data in the temperature range from 1130 − 1400 ° C, have been obtained based on t...
Solubilities of CaO and Al2O3 in copper rich molten oxide phases have wide industrial applications in various copper smelting and refining operations producing copper matte or blister copper. However, experimentally determined solubility data on these simple systems are still scarce even after a long spell of industrial copper making. In this exper...
Phase equilibria of the system Cu–O–CaO–Al2O3 at Po2 of 21278.25 Pa was experimentally investigated for the first time using equilibration techniques. Composition of glassy molten phase and all solids in equilibrium were quantified using Electron Probe Micro-Analyzer (EPMA). Isothermal ternary sections of the ‘Cu2O’–CaO–Al2O3 system in the temperat...
Introduction Method Results Conclusions Acknowledgements
We present experimental results for the liquidus in the system Cu2O - CaO-Al2O3 at 1250 °C. In this study, we quantified the liquidus by the equilibration/quench/analysis technique, with Cu2O, Al2O3, and CaO as primary materials exclusively. Experiments were conducted in air at an at oxygen pressure (p) = 21.3 kPa). Equilibrated specimens were quen...
We present experimental results for the liquidus in the system Cu2O − CaO -Al2O3 at 1250 °C. In this study, we quantified the liquidus by the equilibration/quench/analysis technique, with Cu2O, Al2O3, and CaO as primary materials exclusively. Experiments were conducted in air at an at oxygen pressure (p) = 21.3 kPa). Equilibrated specimens were que...
We present experimental results for the liquidus of the pseudo binary system Cu2O–CaO at metallic copper saturation up to 1698 K in steps of 25 K. In this study, we quantified the liquidus (on the CaO side of the binary) by the equilibration, quench, and analysis technique, with Cu2O, CaO, and Cu as the only primary crystalline phases. Experiments...
The surface tensions of pseudo binary systems Ni3S2–FeS, Cu2S–FeS and Cu2S–Ni3S2 and pseudo ternary system FeS–Cu2S–Ni3S2 as a function of composition, at a constant temperature of 1200°C, have been determined. For the Ni3S2–FeS and Cu2S–Ni3S2 pseudo binary systems, the surface tensions increased with an increase in Ni3S2 content. The amount of Cu2...
Surface tensions of Ni 3S 2, Cu 2S and FeS molten phases were measured using an improved sessile drop method in an inert atmosphere of purified argon. The traditional sessile drop method was modified before measurements were obtained. The surface tension values were obtained over a wide range of temperature from their respective melting temperature...
Projects
Projects (4)
Resources reclaim from waste streams and optimization of the prevailing processes. In this project, fundamental aspects of recycling, extractive metallurgy and energy research are taken to the next level for improving industrial yield and environmental protection. Ideas on disruptive strategies and technologies that would enable a faster move toward ideal circular economy are developed and disseminated.
♻ LinkedIn: https://www.linkedin.com/groups/8871702/
♻ Facebook: https://www.facebook.com/CircularEconomyToday/
