scholarly journals Electrochemical recovery of tellurium from metallurgical industrial waste

2019 ◽  
Vol 50 (1) ◽  
pp. 1-14 ◽  
Author(s):  
Petteri Halli ◽  
Benjamin P. Wilson ◽  
Taye Hailemariam ◽  
Petri Latostenmaa ◽  
Kirsi Yliniemi ◽  
...  
Keyword(s):  
Precious Metals ◽  
Recovery Process ◽  
Leach Solution ◽  
Cuprous Chloride ◽  
Energy Dispersion Spectroscopy ◽  
Recovery Method ◽  
Aqua Regia ◽  
Rich Solution ◽  
Elemental Copper ◽  
Furnace Slag

Abstract The current study outlines the electrochemical recovery of tellurium from a metallurgical plant waste fraction, namely Doré slag. In the precious metals plant, tellurium is enriched to the TROF (Tilting, Rotating Oxy Fuel) furnace slag and is therefore considered to be a lost resource—although the slag itself still contains a recoverable amount of tellurium. To recover Te, the slag is first leached in aqua regia, to produce multimetal pregnant leach solution (PLS) with 421 ppm of Te and dominating dissolved elements Na, Ba, Bi, Cu, As, B, Fe and Pb (in the range of 1.4–6.4 g dm−3), as well as trace elements at the ppb to ppm scale. The exposure of slag to chloride-rich solution enables the formation of cuprous chloride complex and consequently, a decrease in the reduction potential of elemental copper. This allows improved selectivity in electrochemical recovery of Te. The results suggest that electrowinning (EW) is a preferred Te recovery method at concentrations above 300 ppm, whereas at lower concentrations EDRR is favoured. The purity of recovered tellurium is investigated with SEM–EDS (scanning electron microscope–energy dispersion spectroscopy). Based on the study, a new, combined two-stage electrochemical recovery process of tellurium from Doré slag PLS is proposed: EW followed by EDRR. Graphic abstract

scholarly journals Parameter Research of UAV Vertical Rope-type Recovery System

2018 ◽  
Vol 179 ◽  
pp. 03001
Author(s):  
Chengjing Ma ◽  
Xing'an Liu ◽  
Caiwen Zhang
Keyword(s):  
Simulation Analysis ◽  
Initial Conditions ◽  
Recovery Process ◽  
Resistance Force ◽  
Recovery Method ◽  
Recovery System ◽  
Recovery Performance ◽  
Stiffness And Damping Coefficient ◽  
Stiffness And Damping ◽  
Type Recovery

Vertical rope-type recovery system is a new accurate recovery method for small fixed-wing unmanned aerial vehicles (UAV). This paper models the recovery system and finishes the simulation of recovery process. The recovery stand model of the recovery system is built by analyzing the physical essence, and the aircraft model is based on dynamics and kinematics equations as well as the mechanical characteristics of arresting rope. Finally the simulation analysis of the recovery process is completed. On the basis of the modeling simulation, the system parameters’ effect on recovery performance such as maximum resistance force, maximum overload and maximum radius has been discussed by varying each key parameter. Eventually, the pattern of how initial conditions when hitting the rope as well as the arresting rope’s stiffness and damping coefficient influence recovery performance has been researched, and the result could provide theoretical reference for the design of UAV using vertical rope-type recovery and the system in the future.

scholarly journals Neuro-Simulation Tool for Enhanced Oil Recovery Screening and Reservoir Performance Prediction

2017 ◽  
Vol 1 (2) ◽  
pp. 54 ◽  
Author(s):  
Soheil Bahrekazemi ◽  
Mahnaz Hekmatzadeh
Keyword(s):  
User Interface ◽  
Enhanced Oil Recovery ◽  
Graphical User Interface ◽  
Oil Recovery ◽  
Recovery Process ◽  
Production Costs ◽  
Screening Tools ◽  
Simulation Tool ◽  
Screening Criteria ◽  
Recovery Method

Assessment of the suitable enhanced oil recovery method in an oilfield is one of the decisions which are made prior to the natural drive production mechanism. In some cases, having in-depth knowledge about reservoir’s rock, fluid properties, and equipment is needed as well as economic evaluation. Both putting such data into simulation and its related consequent processes are generally very time consuming and costly.  In order to reduce study cases, an appropriate tool is required for primary screening prior to any operations being performed, to which leads reduction of time in design of ether pilot section or production under field condition. In this research, two different and useful screening tools are presented through a graphical user interface. The output of just over 900 simulations and verified screening criteria tables were employed to design the mentioned tools. Moreover, by means of gathered data and development of artificial neural networks, two dissimilar screening tools for proper assessment of suitable enhanced oil recovery method were finally introduced. The first tool is about the screening of enhanced oil recovery process based on published tables/charts and the second one which is Neuro-Simulation tool, concerns economical evaluation of miscible and immiscible injection of carbon dioxide, nitrogen and natural gas into the reservoir. Both of designed tools are provided in the form of a graphical user interface by which the user, can perceive suitable method through plot of oil recovery graph during 20 years of production, costs of gas injection per produced barrel, cumulative oil production, and finally, design the most efficient scenario.

scholarly journals Uptake and Recovery of Gold from Simulated Hydrometallurgical Liquors by Adsorption on Pine Bark Tannin Resin

Water ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 3456
Author(s):  
Maria Beatriz Q. L. F. Torrinha ◽  
Hugo A. M. Bacelo ◽  
Sílvia C. R. Santos ◽  
Rui A. R. Boaventura ◽  
Cidália M. S. Botelho
Keyword(s):  
Electronic Waste ◽  
Precious Metals ◽  
Selective Extraction ◽  
Pine Bark ◽  
Future Research ◽  
Aqua Regia ◽  
Chemical Leaching ◽  
Thiourea Solution ◽  
Pseudo Second Order ◽  
Adsorption Desorption

The recovery of critical and precious metals from waste electrical and electronic equipment (WEEE) is an environmental and economic imperative. Biosorption has been considered a key technology for the selective extraction of gold from hydrometallurgical liquors obtained in the chemical leaching of e-waste. In this work, the potential of tannin resins prepared from Pinus pinaster bark to sequester and recover gold(III) from hydrochloric acid and aqua regia solutions was assessed. Equilibrium isotherms were experimentally determined and maximum adsorption capacities of 343 ± 38 and 270 ± 19 mg g−1 were found for Au uptake from HCl and HCl/HNO3 (3:1 v/v) solutions containing 1.0 mol L−1 H+. Higher levels of acidity (and chloride ligands) significantly impaired the adsorption of gold from both kinds of leaching solutions, especially in the aqua regia system, in which the adsorbent underperformed. Pseudo-first and pseudo-second order models successfully described the kinetic data. The adsorbent presented high selectivity towards gold. Actually, in simulated aqua regia WEEE liquors, Au(III) was extensively adsorbed, compared to Cu(II), Fe(III), Ni(II), Pd(II), and Zn(II). In three adsorption–desorption cycles, the adsorption capacity of the regenerated adsorbent moderately decreased (19%), although the gold elution in acidic thiourea solution had been quite limited. Future research is needed to examine more closely the elution of gold from the exhausted adsorbents. The results obtained in this work show good perspectives as regards the application of pine bark tannin resins for the selective extraction of Au from electronic waste leach liquors.

scholarly journals Leaching of Metal Ions from Blast Furnace Slag by Using Aqua Regia for CO2 Mineralization

Energies ◽  
2016 ◽  
Vol 9 (12) ◽  
pp. 996 ◽  
Author(s):  
Jun-Hwan Bang ◽  
Seung-Woo Lee ◽  
Chiwan Jeon ◽  
Sangwon Park ◽  
Kyungsun Song ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Metal Ions ◽  
Blast Furnace Slag ◽  
Aqua Regia ◽  
Co2 Mineralization ◽  
Furnace Slag

Sleep – A Game Changer in the Athletic World?

2018 ◽  
Vol 66 (4) ◽  
Keyword(s):  
Performance Optimization ◽  
High Performance ◽  
Recovery Process ◽  
Poor Sleep ◽  
Recovery Method ◽  
Lack Of Sleep ◽  
And Performance ◽  
The Individual ◽  
Traditional Approaches ◽  
And Control

The restorative qualities of sleep are fundamentally the basis of the individual athlete’s ability to recover and perform, and to optimally be able to challenge and control the effects of exercise regimes in high performance sport. Research consistently shows that a large percentage of the population fails to obtain the recommended 7–9 hours of sleep per night [17]. Moreover, recent years’ research has found that athletes have a high prevalence of poor sleep quality [6]. Given its implications on the recovery process, sleep affects the quality of the athlete’s training and outcome of competitions. Although an increasing number of recovery aids (such as cold baths, anti-inflammatory agents, high protein intake etc.) are available, recent years research show the important and irreplaceable role of sleep and that no recovery method can compensate for the lack of sleep. Every facet of an athlete’s life has the capacity to either create or take out energy, contribute to the overall stress level and subsequently the level of both recovery and performance. While traditional approaches to performance optimization focus simply on the physical stressors, this overview will highlight the benefits and the basic principles of sleep, its relation to recovery and performance, and provide input and reflect on what to consider when working with development and maintenance of athletic performance.

scholarly journals Simultaneous Recovery of Precious and Heavy Metal Ions from Waste Electrical and Electronic Equipment (WEEE) Using Polymer Films Containing Cyphos IL 101

Polymers ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1454
Author(s):  
Katarzyna Witt ◽  
Włodzimierz Urbaniak ◽  
Małgorzata A. Kaczorowska ◽  
Daria Bożejewicz
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Polymer Film ◽  
Heavy Metal Ions ◽  
Precious Metals ◽  
Electronic Equipment ◽  
Aqua Regia ◽  
Ferrous Metals ◽  
Efficient Recovery ◽  
Cyphos Il 101

In this article, the application of a polymer film containing the ionic liquid Cyphos IL 101 for the simultaneous recovery of precious and heavy metal ions ((Ni(II), Zn(II), Co(II), Cu(II), Sn(II), Pb(II), Ag(I), Pd(II), and Au(III)) from waste electrical and electronic equipment (WEEE) is described. The experiments were performed for solutions containing metal ions released from computer e-waste due to leaching carried out with concentrated nitric(V) acid and aqua regia. It was found that the applied polymer film allows for the efficient recovery of precious metals (98.9% of gold, 79.3% of silver, and 63.6% of palladium). The recovery of non-ferrous metals (Co, Ni, Cu, Zn, Sn, and Pb) was less efficient (25–40%). Moreover, the results of the performed sorption/desorption processes show that the polymer film with Cyphos IL 101 can be successfully used after regeneration to recover metals ions several times.

Progress in Molten Blast Furnace Slag Treatment Using Dry Centrifugal Granulation Technology

2014 ◽  
Vol 675-677 ◽  
pp. 1406-1410
Author(s):  
Jia Bin Zhu ◽  
Shu Zhong Wang ◽  
Ming Luo
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Waste Heat ◽  
Recovery Process ◽  
Water Quenching ◽  
Huge Amount ◽  
Slag Treatment ◽  
Bf Slag ◽  
Granulation Technology ◽  
Furnace Slag

The molten blast furnace slag (BF slag) is discharged at the temperature of about 1400-1550 °C, which contains a large amount of heat. At present, water quenching is the main technology to treat the BF slag, but this method not only consumes a huge amount of water, but also fails to recover the waste heat. Compared with water quenching, the dry centrifugal granulation has obvious advantages. There is no water consumed and the waste heat can be recovered efficiently, thus this technology has great potential. This technology mainly contains two processes: the granulating process and the heat recovery process. The present development statuses on those two processes are summarized respectively and the prospect of dry centrifugal granulation technology is forecasted.

Recovery of 1-Butyl-3-Methylimidazolium-Based Ionic Liquids

2014 ◽  
Vol 879 ◽  
pp. 230-236
Author(s):  
Nurul Fasihah Idaham ◽  
Bustam-Khalil Mohamad Azmi ◽  
Chong Fai Kait ◽  
Zakaria Man
Keyword(s):  
Ionic Liquids ◽  
Recovery Process ◽  
Current Work ◽  
Waste Waters ◽  
Recovery Method ◽  
Water Washing

Ionic liquids have been recognized as an alternative solvent applicable in synthesis, separation, catalysis and electrochemistry. However, the synthesis costs, performance efficiencies and problems related to waste waters contaminated with ionic liquids are the major issues that need to be considered. Thus, recovery method is one of the alternatives to overcome the current issues. 1-butyl-3-methylimidazolium-based ionic liquids were chosen for the study. The recovery process was conducted in two steps; water-washing and recovery using solvent. All the selected ionic liquids were extracted with water and BMIM CH3SO4was 100% recovered. However the ionic liquids contained high percentage of water which may change the properties of the ionic liquids. This current work has studied not only on the performance of recovery, but also on the properties and the behaviour of the ionic liquids to be further reused in a particular application.

Gold Recovery from WEEE by Chlorine System

2013 ◽  
Vol 330 ◽  
pp. 123-125 ◽  
Author(s):  
Mahtab Assadian ◽  
Mohd Hasbullah Idris ◽  
Seyed Morteza Ghaffari Shahri ◽  
Babak Gholampour
Keyword(s):  
Economic Growth ◽  
Nitric Acid ◽  
Technological Innovation ◽  
Reaction Temperature ◽  
Precious Metals ◽  
Gold Recovery ◽  
Aqua Regia ◽  
Market Expansion ◽  
The World ◽  
The Revolution

This work compared the effect of nitric acid and chloride acid systems on dissolving precious metals of Electrical and Electronic Equipments (EEE). As a result of the revolution of informatics technology, the production of EEE is rapidly increasing in the world. Due to economic growth, technological innovation and market expansion of EEE there is a significant increase in waste of EEEs (WEEE) that presents a new environmental challenge.The results show that the best recovery of gold can be obtained via aqua regia (3HCl=HNO3), with concentration of 1/10 gr/L. The reaction temperature has little effect on the extent of extraction.

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