2 edition of Recovery of metal from dilute solution using porous electrode found in the catalog.
Recovery of metal from dilute solution using porous electrode
I. Mohd Saaid
|Statement||I. Mohd Saaid ; supervised by E.P.L. Roberts.|
|Contributions||Roberts, E. P. L., Chemical Engineering.|
The rate of diffusion-controlled removal of Cu2+ from a dilute solution containing a fluidized bed of ion-exchange resin in a batch stirred parallel-plate electrochemical reactor was investigated. The variables studied were the concentration of ion-exchange resin, impeller rotation speed, and impeller geometry. The rate of mass transfer of Cu2+ removal was measured in three cases, namely, (i. 6. Electrolysis of copper(II) chloride solution. The products of electrolysing copper chloride solution are copper metal and chlorine gas. In the simple electrolysis cell (left diagram), the graphite (carbon) electrodes are, through a large rubber bung, 'upwardly' dipped into an solution of dilute .
A simple electrolysis reaction using aluminum metal electrodes in a salt-water solution. Metals in such solutions are reduced at the inner surface of the porous electrodes as the electrolyte is percolated through the cell. In the past, an investigation reported the results obtained for the removal of Pb(II) from different pH 2 aqueous media (Ponce de Leon and Pletcher, ).
The flat plate cathodes are used for applications of gross metal recovery from concentrated solutions (e.g., >1 g/l of metal). The expanded metal, wire mesh, or reticulate plate and the porous or woven types are used for recovering metals from solutions with lower metal concentrations, with the latter group effective in some cases in the low mg. Calomel Reference Electrode • Can use 1 M or M KCl rather than a saturated solution • E for reference changes slightly with any change in concentration from the Nernst Eq • Temperature coefficient of reference electrode is less with 1 M or M than for SCE • SCE often gets clogged if solution .
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Porous cathodes, however, suffer from the disadvantages that its porous matrix becomes clogged with the metallic deposit. Bennion et al. studied the electrochemical removal and recovery of copper ions from very dilute solutions by using porous and fixed flow-through carbon electrodes.
The used porous electrodes were chips of carbon and by: From the previous studies Bennion et al. investigated the electrochemical removal and recovery of copper ions from very dilute solutions by using porous, fixed, carbon electrodes.
They reported that, the potential difference between the carbon matrix and the solution at all points within the porous electrode should be sufficient but not too large, to ensure copper deposition without hydrogen by: A one-dimensional model for flow-through porous electrodes operatingabove and below the limiting current of a metal deposition reaction has beendeveloped.
The model assumes that there is one primary reactant species in anexcess of supporting electrolyte, and that a simultaneous side reaction mayoccur. The model predicts nonuniform reaction rates due to ohmic, mass-transfer,andCited by: J. Trainham and J. Newman, A flow-through porous electrode model: Application to metal-ion removal from dilute streams, J.
Electrochem. Soc.– (). CrossRef Google ScholarCited by: 9. Flotation, a process originating from the minerals industry, is finding its way as a separation process for dilute aqueous solutions, with particular interest in metal ions recovery. The metal ions are effectively recovered from dilute solution using ion exchange technique, but the high cost of resin limits its application [6, 7]; however, the electrolytic process has the advantages of metal recovery without further sequential treatment.
Electrode position has been usually applied for the recovery of metals from wastewater. Comparison of phase separating porous electrodes using dilute and concentrated solution theory to model the electrolyte.
Polarization curves (a) and final electrolyte concentration profiles (b) are presented for a 1 C discharge. In (b) the gray vertical dashed lines indicate the edge of the separator.
The available literature on the use of electrochemical methods for recovery of metal value from MIW was limited in searchable databases of journal articles and conference proceedings. Copper was the only metal consistently targeted for recovery in dilute MIW treatment. Most of the studies are laboratory based, with only a few examining actual MIW.
Effect of electrode pulsation on the rate of simultaneous electrochemical recovery of copper and regeneration of ferric salts from dilute solutions treating dilute solutions containing copper.
There is also a reference electrode similar to ion selective electrode, but there is no to-be-measured ion in the internal electrolyte and the selective membrane is replaced by porous frit, which allows the slow passage of the internal filling solution and forms the liquid junction with the external text solution.
A FLOW-THROUGH POROUS ELECTRODE MODEL: APPLICATION TO METAL-ION REMOVAL FROM DILUTE STREAMS. Author(s): Trainham, James A. et al. Main Content Metrics Author & Article Info.
Main Content. Download PDF to View View Larger. Thumbnails Document Outline Attachments. Previous. Next. Highlight all Match case. removes only the metal, and thus decouples the production and recovery processes.
In the past, electrolytic metal recovery was studied as a means of recovering metals from spent plating baths. recent years, interest has grown in recovery of metals from dilute rinse solutions.
significant problems, however, because of cathode polariza- tion. It operates in two steps: First, the porous electrodes and the separator are filled with natural brine to extract Li + and Cl − by intercalation and adsorption. Then, after rinsing with water the reactor is filled with a dilute LiCl recovery solution and LiCl is recovered by reversing the electrical current.
Electrolytic recovery of metals from dilute solution has been reported using conventional porous electrodes such as felt electrode and reticulated electrode, but use of such electrodes is limited. The pores of such electrodes become blocked as a consequence of metal deposition. Iglia et al. () studied the reduction of Cr (VI) using an RVG (reticulated vitreous graphite) in an attempt to process the deposition of this metal.
Use of the GBC reactor for reduction of chromate in dilute solution with a carbon-particle packed-bed electrode is reported by Wijnbelt and Janssen ().
charges on the electrode and in the electrolyte solution near the electrode. There is always some capacitive current flowing when the potential of an electrode is changing, and the capacitive current is generally zero when the potential is constant.
Also called "non-faradaic" or "double-layer" current. A polarization study of electrode processes that occur on a renewable graphite microelectrode in ammonium solutions of varied composition was carried out.
The change in the properties of fibrous carbon electrodes in their cyclic use in electrodeposition-recovery of cadmium and the possibility of their repeated use were analyzed. Generate link with commentsElectrochemical removal of heavy metals such as chromium from dilute wastewater streams using flow through porous electrodes.
Electrochemical removal of heavy metals such as chromium from dilute wastewater streams using flow through porous electrodes. Aqueous solutions containing the cations of reactive metals like potassium, sodium or magnesium are NOT discharged at the negative cathode electrode, but hydrogen ions are, so you get hydrogen instead of a metal formed on the electrode surface.
Theoretically the gas volume ratio for H2:O2 is which you see with the Hofmann Voltameter. Using porous carbon electrodes for copper recovery. Recently, I'm recovering copper from electroplating rinse water by electrochemical method. I have some difficulty in recovering metal like copper that has deposited on the porous carbon electrodes economically.
I hope that experts out there could assist me in that matter. Thank you very much. Reversible electrochemical processes are a promising technology for energy-efficient water treatment. Electrochemical desalination is based .rated porous electrode scenario.
Finally, the convective and electrokinetic transport times are compared and their effect on desalination performance is presented.
Steady test results for outlet to inlet concentration ratio show a strong dependence on ﬂow rate and concentration independence for dilute solutions.This disclosure concerns primarily the recovery of hydrogen-reduced metals from aqueous solutions of salts thereof, by hydrogen reduction at a porous hydrophobic catalytic barrier, at ordinary temperatures, in an apparatus provided with means to supply hydrogen to one face and aqueous solution to the other face of said barrier.