Concentrationpurification of uranium from an acid leaching. China hydrometallurgy ion exchange resin suppliers. In the exchange process, the ions of the solution to be treated are exchanged with accumulated ions with the same electrical charge on the resin. The worldwide demand for alternative energy sources has resulted in a renewed interest in the uranium industry. Ion exchange ix is the reversible interchange of ions between a solid and a liquid such as water. Ion exchange, hydrometallurgy, uranium, precious metals, base metals. Ion exchange also plays a valuable role in the management of nuclear wastes generated in the fuel cycle. Therefore, a project was undertaken to learn how best to regenerate the resins in the groundwater vessels. A book on ion exchange, adsorption and solvent extractionchapter 2 polymer based ion exchange resin. Ion exchange technology in the remediation of uranium. Ion exchange resins are used to remove dissolved particles from liquids. A solution containing vanadium and uranium and excess sodium carbonate is passed through a column filled with an anion exchanger in the chloride form. Pdf present and future applications of ion exchange in. Ion exchange investigation for recovery of uranium from.
The stream needed to be boiled for 6 h to lower the total carbonate concentration before it could be treated. An alternate process for the recovery of uranium by ion exchange. Solidphase extraction, in combination with an ion exchanging, has also been used in the separation of u from its radioactive daughters. The effectiveness of ion exchange resins in separating. Notes of practical application of ion exchange resins in uranium. Ion exchange resins for water treatment by adsorption. Pdf ion exchange investigation for recovery of uranium. The effect of pyrocarbon coating permeability on uranium. A wide variety of process streams benefit from the application of ion exchange resins, as. Conventional ion exchange resins with different functional groups were evaluated for their potential application in separating uranium uvi and thorium thiv from rare earth elements reiii. Strongbase anionexchange resins, with quaternary ammonium functional. Pdf ion exchange resins in uranium hydrometallurgy full book ion exchange resins in uranium hydrometallurgy ppt hydrometallurgy powerpoint presentation id 1890398 pin. Engineering aspects of ion exchange in hydrometallurgy. Examples of ion exchange processes developed at hazen include the recovery of gold and silver from cyanide solutions and alternate lixiviants, and uranium recovery from both acid and carbonate circuits.
Separation of uranium by anion exchange pdf free download. Sorption of rhenium and uranium by strong base anion exchange resin from solutions with different anion compositions. Ion exchange resins are used in the extraction of various metals, including rare metals and precious metals,etc. This site is like a library, use search box in the widget to get ebook that you want. The acid leaching operating conditions allow us to obtain a recovery uranium. The regeneration of spent ion exchange resins is considerably more cost effective than their replacement. Uranium sorption using lewatit monoplus m500 from sulphate. The selectivity of these resins to adsorb uvi and thiv in the presence of. Once the pls solution saturates the anionic resin, a hydrochloric solution extracts uranium, and a sodium hydroxide solution extracts molybdenum. This overview discusses selected modern applications of ion exchange in hydrometallurgical processes for uranium, precious metals, copper, cobalt, nickel, zinc, and the rareearth elements, and. Click download or read online button to get hydrometallurgy in extraction processes book now. Ion exchange offers various grades of chelating resins, strong and weak acid cation exchange resins for removing or recovering metal ions. Strongbase anionexchange resins, with quaternary ammonium functional groups. A book on ion exchange, adsorption and solvent extraction, 1544, pub.
The kernel is fabricated from a weak acid ion exchange resin. Direct operating cost ammonium diuranate uranium industry strong base resin weak base resin. When an industrial facility requires ion exchange technology as part of its process, its important to not only know how much the ion exchange resins cost but also to factor in expenses associated with maintaining and disposing of them. Development of economically effective processes for leaching of natural uranium resulted in three chemically different routes. The influence of the major variables on column operation is described, plant performance data are summarized, cost factors are enumerated, and the probable application of this operation to metals at least as valuable. Research article full text access uranium extraction using a deep fluidized bed of ion exchange resin. The ion exchange process used to extract uranium from the leaching solution is based on the high binding constants of the anionic sulfate complexes of uranium relative to the anion on the anion exchange resin chloride, primarily due to their higher negative charge. This solution was passed through tile column at a flow rate of less than so mlll. The eluant also contains a base such as ammonium hydroxide in an amount sufficient to increase the ph to a value within the range of 9.
Uranium carbonate industrial waste streams from a brazilian nuclear production plant were treated by an ion exchange process using a type ii strong base anion exchange resin, ira910a with a dimethyl 2hydroxy ethyl functional group. It is an insoluble matrix or support structure normally in the form of small 0. The resins studied comprised strong and weakbase anion exchange resins, and strong and weakacid cation exchange resins. Applications of ion exchange ion exchange technology is used for the primary recovery of metals of interest or the removal of specific impurities in order to increase the value and purity of the final product. Hydrometallurgy in extraction processes download ebook. These costs can be difficult to narrow down because of the many types of resins available on the market today there are thousands in addition to all the. The ion exchange resin is eluted with an eluant containing 0. A list of metals that have been recovered and purified commercially by ion exchange is given in table 1. An alternative approach to the recovery of uranium by ion exchange involves the additional loading of uranium onto a partially loaded resin followed by the. High purity ion exchange resin for use in nuclear power plants. How much does it cost to buy, maintain, and dispose of ion. Tlic uranium was tllus adsorbed on the resin whereas most of the other. Written in a readerfriendly style, it offers complete coverage of leaching, including insitu, heap, dump, and vat leaching. Uranium remediation by ion exchange and sorption methods.
Ion exchange resins remove harmful contaminants from liquids, replacing them with beneficial, desired ions. Pdf csa continuous countercurrent ion exchange ccix. The particle size is ranging from 30 40 mm with 1 2 mm film thickness. Various exchange active groups, at which ions accumulate, are built into the exchangers. Ion exchange is used in nearly every part of the nuclear fuel cycle from the purification of uranium from its ore to the final recovery of uranium and transmutation products. Process for the recovery of uranium from a pregnant lixiviant employed in uranium leaching operations in which the uranium is concentrated by ion exchange resin. Ion exchange is particularly suitable for high cost, low throughput purification processes. All our customized water filtration medias are with high quality and competitive price. Principles and applications focuses on the theoretical principles and engineering aspects of hydrometallurgical processes. This overview discusses selected modern applications of ion exchange in hydrometallurgical processes for uranium, precious. Microradiographic examination of coated weak acid, ion exchange resin particles demonstrated that a considerable quantity of uranium can be transferred from the kernel into the buffer coating during fabrication.
The ion exchange technique allows recovering both species using one anionic resin. The present work has focused on the uptake behavior of uranium vi from sulfuric acid media by using lewatit monoplus m500 resin. As one of the leading hydrometallurgy ion exchange resin manufacturers and suppliers in china, we warmly welcome you to wholesale discount hydrometallurgy ion exchange resin made in china here from our factory. Uranium has been recovered via ion exchange resins since the 1950s. Ion exchange chromatography was applied for uranium sorption, using commercially available, strongly basic anion exchanger, dowex 1. Separation of uranium from vanadium by ion exchange. Ion exchange resins are widely used for removing impurities from aqueous process streams, waste water, and mine waters.
Isolation of uranium by anionic exchange resins 91 radium contained in the eluate of this second column is purified in a cation exchange resin dowex 50wx8, 100 mesh at ph 1. Aside from its use to purify drinking water, the technique is widely applied for purification and separation of a variety of industrially and medicinally. Continuous counter current ion exchange in uranium ore processing. Pdf ion exchange has traditionally been employed for water purification. Uranium plants are typically capable of processing 100 m 3 hr of pregnant solution and it is the uranium industry that has been responsible for the many innovations that have occurred in the development of ion exchange technology in recent years. These functionalized polymers adsorb particular anions or cations from the liquid and discharge others. These have very low ion exchange capacity to separate the ions. A wide variety of process streams benefit from the application of ion exchange resins, as shown in table 1. Ion exchange is used in water treatment, including water softening, industrial demineralization, condensate polishing, ultrapure water. Uranium and molybdenum recovery from copper leaching solutions. An ionexchange resin or ion exchange polymer is a resin or polymer that acts as a medium for ion exchange. The optimum conditions were explicated via the sorption kinetics, the isotherm models and the thermodynamic data to determine the behavior of the. More precisely, the term encompasses a large variety of processes where ions are exchanged between two electrolytes.
The influence of parameters, namely ph, u vi initial concentration, contact time and temperature were investigated. Contact us for free sample, pricelist and quotation. Ion exchange resin technology in recovery of precious and noble. In some cases, the scale of operation is relatively small, e. The chelating resins having aminophosphonic, iminodiacetate, thiol and thiouronium functional groups are used for removing specific ions from a mixture of ions. Uranium is recovered from the ion exchange resin using a diluted hcl. An ion exchange method has been worked out for the separation of milligram quantities of uranium from large amounts of vanadium. Notes of practical application of ion exchange resins in. Water treatment is the bestknown and biggest field of application for ion exchange resins. In hydrometallurgical applications, ion exchange resins have been used increasingly for the recovery. All the uranium and part ot the vanadium arc adsorbed by the resin.
In model experiments, the influence of degree of crosslinking of dowex 1 on the efficiency of uranium extraction was investigated. Uranium and molybdenum recovery from copper leaching. In this section, the chemistry involved, the main factors affecting the resins performance, the equipment in which the resins are used, the main problems encountered and how one can evaluate resins in the laboratory are discussed. Emmanuel zaganiaris, consultant france polyamine functionalised chelation ion exchange resins for uranium extraction 196. Purolite has been supplying ion exchange resins for uranium recovery for many years and has accumulated much experience in the requirements of the industry. The overall dynamic process consisted in a preconditioning step for the resin, using a weak hydrochloric acid solution. Resin description of process ion exchangers are synthetic resins organic polymers. Ion exchange resins are particularly suitable for extracting separated metals from low grade minerals and tailings leaching or slurry, it plays an important role in separating metals with similar properties. Applications of ion exchange in hydrometallurgy springerlink. Have a question about ion exchange, adsorbent, chelation, catalyst or specialty resins. The focus is on ion exchange rather than on uranium hydrometallurgy and therefore this book is addressed to all.
These developments are now beginning to pervade into new areas of application for ion. The beads are typically porous, providing a large surface area on and inside them. Us4280985a process for the elution of ion exchange. Next, the copper pls solution feeds the fixed bed of the ion exchange column. Insights on uranium uptake mechanisms by ion exchange resins with chelating functionalities. Ion exchange usually describes a processes of purification of aqueous solutions using solid polymeric ion exchange resin. Hydrometallurgy vol 8, issue 2, pages 101196 march. The effectiveness of ion exchange resins in separating uranium and thorium from rare earth elements in acidic aqueous sulfate media. The first application of ion exchange to extractive hydrometallurgy is the use of a strong base anion exchange resin for selective recovery of uranium from sulfate leach liquors. The major species in solution is the uranyl trisulfate tetraanion.
1025 545 1008 1501 217 1347 611 972 1353 1323 364 106 1581 71 704 1188 1162 969 652 1218 1142 224 850 604 1033 209 754 977 660 134 100 1232