Evaluation of reciprocating flow ion exchange for aurocyanide recovery. by Jeff Douglas McLaughlin Download PDF EPUB FB2
Utilizing a new technique called Reciprocating Flow Ion Exchange, the system offers a number of significant cost and size advanta- ges over conventional ion exchange. Process fundamentals, field data, working experiences and installation photographs are presen- ted.
steel applications. The process is adaptable to chrome recovery in tin free 1. The mctalhargical application of reciprocating flow ion exchange to concen- trated solutions, Ph.D.
Thesis, Dept. of Metallurgy and Materials Scicncc, Univ. of To- ronto (). 5 Brown, C.J., Acid and metals recovery by Rccoflo short bed ion exchange.
In: G.A. Davies (Editor), Separation Processes in by: 5. The use of activated carbon and carbon-in-pulp in the recovery of gold from cyanide solutions is well established. However, ion exchange resins present a number of advantages over carbon such as higher loading, the regeneration of cyanide ions for recycling to the leach circuit and the elimination of periodic re-activation and high temperature by: 4.
Aurocyanide ion adsorption occurs irreversibly through the electrostatic interaction of Au (CN) 2− on the active polar sites of activated carbon, but the ionic pair KAu(CN) 2 occupies fewer.
Comparing to solvent extraction, uranium recovery by ion exchange method is preferred because the ion exchange process is safe due to the low toxicity of the media and negligible fire risk.
Furthermore, ion exchange route can be used effectively for lower grade ores or systems with difficult liquid–solid separation characteristic [ 98 ].Cited by: 2. Ion Exchange as a Physical Process • During ion exchange the ions being exchanged are reversibly removed from the wastewater and transferred to the ion exchanger • This means that ion exchange is a physical separation process in which the ions exchanged are not chemically altered • Since the chemical characteristics of the ions.
Ion exchange has traditionally been employed for the purification of water and the removal of metal contaminants from dilute waste streams. More recently, its use in removing trace metallic impurities from hydrometallurgical process streams (with typical background metal concentrations of 50– g/L) has increased substantially.
Flow-scheme o f the Buchim Mine combined ion exchange and solvent extraction flowsheet for copper recovery (adapted f rom Neufeind et al. 78 and Savov et a l. 79). Society of Chemical Industry. An ion exchange process is to be used to soften water at the rate of gpm. A synthetic zeolite resin will be packed in shells with diameter of 5 ft.
The resin has an exchange capacity of kilograins of CaCO 3 per ft when regenerated at the 3rate of 15 Ib of salt per ft. The raw water has total hardness of mg/L as CaCO 3.
In the present work, seven ion‐exchange resins were tested in order to detoxify corn stover hydrolyzate. Regarding xylose recovery, it was observed that more than 92% recovery was feasible.
Furfural removal varied from % to %, and hydroxymethylfurfural (HMF). Ion-exchange removal of aurocyanide The ion-exchange removal of aurocyanide ions from waste waters of gold plating is the most frequently applied method in practice for gold recovery. For this aim Peev et al.  used the strong base anionite Vofatit SBK in chloride form.
Ion exchange chromatography (or ion chromatography, IC) is a subset of liquid chromatography which is a process that allows the separation of ions and polar molecules based on their charge.
Similar to liquid chromatography, ion chromatography utilizes a liquid mobile phase, a separation column and a detector to measure the species eluted from. Evaluation of a large scale m3/d demonstration plant has been planned, in order to define process performance.
TABLE 3 Basic design data for Bari's m' /d ion exchange demonstration plant Resin Resin inventory Ion exchange columns Feed concentration Nutrient removal Service Flow rate (down) Throughput Duration Exchange capacity.
Ion-exchange breakthrough curves obtained from a fixed-bed column packed with raw orea, led to an operating capacity ofand mEq/g for Cu, Zn and Ni, corresponding to exchange-active groups: • Weak acidic / strong acidic • Weak basic / medium basic / strong basic The various ion exchanger resin qualities are used for demineralisation in a variety of processes: Co-current flow process Very robust process technology, but requires relatively large amount of chemicals and offers moderate demineralisation rates.
The technique of ion exchange chromatography is based on this interaction. Ion exchange is probably the most frequently used chromatographic technique for the separation and purification of proteins, polypeptides, nucleic acids, polynucleotides, and other charged biomoleules. The reasons for the success of ion exchange are its widespread.
Control of Ion-exchange Processes for Treatment of Radioactive Wastes), the other in (Technical Reports Series No. Treatment of Spent Ion-exchange Resins for Storage and Disposal). Since the publication of those reports, many new developments have been reported for improving the efficiency of ion exchange process applications.
Ion exchange can be used to separate phosphorus from iron when phosphorus is recovered from sewage sludge. A review of the use of ion exchange for phosphorus recovery is presented followed by a discussion on how to use ion exchange for separation of metal and phosphate.
Example of processes for recovering of phosphate with ion exchange are. Ravi Christo, Shufeng Shen, Geoff W. Stevens, Effect of Plate Material on Dispersed-Phase Holdup in a Karr Reciprocating Plate Column, Solvent Extraction and Ion Exchange, /, 29,(), ().
The use of ion exchange resins for the recovery of gold and silver cyanide complexes from either low or high-grade cyanide solution has received considerable attention over the past few decades, both on laboratory and industrial scale (Fleming and Cromberge, a, Fleming and Cromberge, b, Kotze et al., ).
In order to recover Pt from the hydrochloric acid leaching solution of spent catalysts, bench scale Karr reciprocating column was employed. At an optimum flow rate and vibration frequency, iron.
Behavior of the strongly basic, macroporous ion-exchange resin Amberlite IRA Cl is circumstantially explained in the book chapter. Effects of different specific flow rate (SFR) and determination of its optimum value, as well as effects of the empty-bed contact time (EBCT) values on the removal of NOM, arsenic, sulfate, electrical conductivity, bicarbonate and chlorine from groundwater.
greater is the preference for the ion by the exchanger. An ion exchanger tends to prefer 1. ions of higher valence, 2.
ions with a small solvated volume, 3. ions with greater ability to polarize, 4. ions that react strongly with the ion exchange sites of the exchanger solid, and 5. ions that participate least with other ions to form complexes. On-line ion-exchange preconcentration of iron(III) on a conventional cation exchange resin with spectrophotometric detection based on thiocyanate complexation is described.
The calibration graph is linear over the range – μg ml−1 and the detection limit (3 σ) is 6 ng ml−1 for a 6-ml sample.
No interference effects were detected. The recovery of iron from the resin is 95%. Principles of ion exchange This chapter provides a general introduction to the theoretical principles that underlie every ion exchange separation.
An understanding of these principles will enable the separation power of ion exchange chromatography (IEX) to be fully appreciated.
Practical aspects of performing a separation are covered in Chapter 2. In the present study, the recovery of ammonium ions from landfill leachate of municipal solid waste was investigated using four ion exchange resins: Amberlyst 15 Wet (strong acid cation), Lewatit VPOC (strong acid cation), Dowex MAC-3 (weak acid cation) and Purolite MN (without acid or basic functional group).
The studies of sorption were conducted under batch conditions. 49 Table - Capital Costs for Phenol Recovery Process 3 Instrumented adsorption columns $, (Epoxy-lined carbon steel with polypropylene- lined piping and fittings, fully automated) Auxiliary equipment $5, (2 SS pumps and piping) Installation $26, (20% of equipment costs) Resin $17, (Average of 87 ft3 WA30 (5) $/ft3 and The hydrodynamic behavior of an expanded-bed ion exchange resin, D, was investigated to show that D resin is able to act as an adsorbent for recovery of SA from Illicium verum.
Capacity, Total—The ultimate exchange ability of an ion-exchange resin. Total capacity is determined experimentally using large dosages of analytical grade regenerant on small amounts of resin. Results are often expressed in milli-equivalents per milliliter of resin, Color Throw—The transfer of color from an ion-exchange resin to a liquid.
Ion-exchange procedures. Only rarely are ion exchangers used in stepwise procedures, in which the resin is mixed into a container of solution and then removed for further more frequently the exchanger is packed into a tube or column through which the solution is made to flow.
The column arrangement forces the ion-exchange reaction, which is intrinsically reversible, to go to. (). Review of the Application of Ion Exchange Resins for the Recovery of Platinum-Group Metals From Hydrochloric Acid Solutions.
Mineral Processing and Extractive Metallurgy Review: Vol. 35, No. 6, pp. Ion exchange is a promising option for recovering nutrients (nitrogen, phosphorus, and potassium) from source-separated urine.
We determined that it was feasible to integrate nitrogen and potassium recovery via cation exchange with phosphorus recovery, either via struvite precipitation or anion exchange.
Flow rate and intermittent operation did not significantly affect ammonium recovery and.Sample Load Apply sample (from step 1) at a consistent and reduced flow rate of ~ drops/second to ensure optimal retention.
Mass transfer kinetics of ion-exchange SPE are slower than reversed-phase and normal-phase. Reduced flow rate is critical for consistent recovery.