Classifications

• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
  • C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
  • C22B3/20—Treatment or purification of solutions, e.g. obtained by leaching
  • C22B3/22—Treatment or purification of solutions, e.g. obtained by leaching by physical processes, e.g. by filtration, by magnetic means, or by thermal decomposition
  • C22B3/24—Treatment or purification of solutions, e.g. obtained by leaching by physical processes, e.g. by filtration, by magnetic means, or by thermal decomposition by adsorption on solid substances, e.g. by extraction with solid resins
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
  • C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
  • C22B3/20—Treatment or purification of solutions, e.g. obtained by leaching
  • C22B3/42—Treatment or purification of solutions, e.g. obtained by leaching by ion-exchange extraction
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J14/00—Chemical processes in general for reacting liquids with liquids; Apparatus specially adapted therefor
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
  • C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
  • C22B3/04—Extraction of metal compounds from ores or concentrates by wet processes by leaching
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
  • C22B60/00—Obtaining metals of atomic number 87 or higher, i.e. radioactive metals
  • C22B60/02—Obtaining thorium, uranium, or other actinides
  • C22B60/0204—Obtaining thorium, uranium, or other actinides obtaining uranium
  • C22B60/0217—Obtaining thorium, uranium, or other actinides obtaining uranium by wet processes
  • C22B60/0221—Obtaining thorium, uranium, or other actinides obtaining uranium by wet processes by leaching
  • C22B60/0226—Obtaining thorium, uranium, or other actinides obtaining uranium by wet processes by leaching using acidic solutions or liquors
  • C22B60/0234—Obtaining thorium, uranium, or other actinides obtaining uranium by wet processes by leaching using acidic solutions or liquors sulfurated ion as active agent
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
  • C22B60/00—Obtaining metals of atomic number 87 or higher, i.e. radioactive metals
  • C22B60/02—Obtaining thorium, uranium, or other actinides
  • C22B60/0204—Obtaining thorium, uranium, or other actinides obtaining uranium
  • C22B60/0217—Obtaining thorium, uranium, or other actinides obtaining uranium by wet processes
  • C22B60/0252—Obtaining thorium, uranium, or other actinides obtaining uranium by wet processes treatment or purification of solutions or of liquors or of slurries
  • C22B60/0265—Obtaining thorium, uranium, or other actinides obtaining uranium by wet processes treatment or purification of solutions or of liquors or of slurries extraction by solid resins
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
  • Y02P10/00—Technologies related to metal processing
  • Y02P10/20—Recycling

Definitions

• the process of extracting uranium from ore often involves leaching the ore with sulfuric acid to produce an acid leach solution. Often, the acid leach solution is then passed through an ion exchange resin (for example a strong base anion exchange resin). The uranium is thought to become loaded onto the resin in the form of the [U0 2 (S0 4 )3] 4" complex anion. Often the uranium is removed from the resin by eluting with sulfuric acid. The sulfuric acid eluate produced in this elution is an acidic aqueous solution that contains sulfuric acid, uranium, and impurities such as iron.
• an ion exchange resin for example a strong base anion exchange resin
• WO 2015/135017 describes a process in which uranium is recovered from a Pregnant Strip Solution ("PSS", optionally produced by loading a leach solution onto an ion exchange resin and subsequently eluting with sulfuric acid) by loading the PSS onto a separate ion exchange resin that is a chelating resin that contains an amino phosphonic or phosphonic/sulfonic functional groups.
• PSS Pregnant Strip Solution
• a first aspect of the present invention is a process for recovering uranium comprising
• Fig. 1 shows a an embodiment in which solution (I) passes through a bed to resin (I) to produce solution (II) and resin (II).
• Fig. 2 shows an embodiment in which further features have been added to the embodiment shown in Fig. 1 ; the further features added in Fig. 2 provide one method of recovering uranium from resin (II).
• Fig. 3 shows an embodiment in which further features have been added to the embodiment shown in Fig. 1 ; the further features added in Fig. 3 provide a second method of recovering uranium from resin (II).
• Figure 4 shows a flow sheet for and embodiment of Option A as defined below.
• Figure 5 shows a flow sheet for an embodiment of Option B as defined below.
• Figure 6 shows an embodiment of Option B that incorporates a scrubbing step.
• Figure 7 shows uranium loading on a given strong acid cation exchange resin from various solutions containing different concentrations of sulfuric acid and uranium.
• Figure 8 shows uranium loading for various resins at different uranium
• an aqueous solution is a solution of one or more compound dissolved in a solvent, where the solvent contains water, and where the solution contains 30% or more water by weight.
• Resin as used herein is a synonym for "polymer.”
• a “polymer,” as used herein is a relatively large molecule made up of the reaction products of smaller chemical repeat units. Polymers may have structures that are linear, branched, star shaped, looped, hyperbranched, crosslinked, or a combination thereof; polymers may have a single type of repeat unit (“homopolymers”) or they may have more than one type of repeat unit
• Copolymers may have the various types of repeat units arranged randomly, in sequence, in blocks, in other arrangements, or in any mixture or combination thereof. Polymers have weight-average molecular weight of 2,000 or more.
• Vinyl monomers have a non-aromatic carbon-carbon double bond that is capable of participating in a free-radical polymerization process. Vinyl monomers have molecular weight of less than 2,000. Vinyl monomers include, for example, styrene, substituted styrenes, dienes, ethylene, ethylene derivatives, and mixtures thereof. Ethylene derivatives include, for example, unsubstituted and substituted versions of the following: vinyl acetate and acrylic monomers.
• Acrylic monomers are monomers selected from substituted and unsubstituted (meth)acrylonitrile, (meth)acrylic acid, alkyl esters of (meth)acrylic acid, amides of (meth)acrylic acid, vinyl chloride, halogenated alkenes, and mixtures thereof.
• (meth)acryl- means either acryl- or methacryl-.
• “Substituted” means having at least one attached chemical group such as, for example, alkyl group, alkenyl group, vinyl group, hydroxyl group, alkoxy group, carboxylic acid group, other functional groups, and combinations thereof.
• vinyl aromatic monomers are vinyl monomers that contain one or more aromatic ring.
• a monovinyl monomer is a vinyl monomer that has exactly one non-aromatic carbon-carbon double bond per molecule.
• a multivinyl monomer is a vinyl monomer that has two or more non-aromatic carbon-carbon double bonds per molecule.
• Vinyl monomers are considered to form polymers through a process of vinyl polymerization, in which the carbon-carbon double bonds react with each other to form a polymer chain.
• Another type of polymers are those formed by condensation reactions between monomers. For example, phenol and formaldehyde react with each other to form “phenolic resins” or “formophenolic resins.”
• a polymer in which 90% or more of the polymerized units, by weight based on the weight of the polymer, are polymerized units of one or more vinyl monomers is a vinyl polymer.
• a vinyl aromatic polymer is a polymer in which 50% or more of the polymerized units, by weight based on the weight of the polymer, are polymerized units of one or more vinyl aromatic monomer.
• a resin is considered herein to be crosslinked if the polymer chain has sufficient branch points to render the polymer not soluble in any solvent.
• a polymer is not soluble in a solvent, it means that less than 0.1 gram of the resin will dissolve in 100 grams of the solvent at 25 °C.
• a resin is considered herein to be a strong acid cation exchange resin (SAC resin) if 50 mole% or more of the polymerized units contain one or more sulfonate group.
• the sulfonate group may be attached to the monomer prior to polymerization or may be added to the polymerized unit after polymerization.
• the sulfonate group may be in protonated form, in a neutralized form involving one or more cations other than H + , in ionic form, or in a mixture thereof.
• An SAC resin is said herein to be in "protonated form” if 90 mole % or more of the sulfonate groups attached to the resin are in protonated form.
• a resin is considered herein to be a strong base anion exchange resin (SBA resin) if 50 mole% or more of the polymerized units contain one or more quaternary ammonium group.
• the quaternary ammonium group may be attached to the monomer prior to polymerization or may be added to the polymerized unit after polymerization.
• the quaternary ammonium group may be in hydroxide form, in a neutralized form involving one or more anions other than OH " , in ionic form, or in a mixture thereof.
• a resin is considered herein to be a weak base anion exchange resin if 50 mole% or more of the polymerized units contain one or more amine group.
• the amine groups may be primary, secondary, or tertiary, or a combination thereof.
• the amine group may be attached to the monomer prior to polymerization or may be added to the polymerized unit after polymerization.
• the amine group may be free base form, or in a protonated form (i.e., an ammonium group) involving one or more anions or a mixture thereof.
• a collection of particles is characterized by the diameters of the particles. If a particle is not spherical, the diameter of the particle is considered to be the diameter of a particle having the same volume as the particle. A collection of particles is characterized herein by the volume- average diameter of the collection.
• Resins may be characterized by the average pore diameter, which is measured by the BET method.
• a "gel” resin has average pore diameter of 10 nm or less.
• a "macroporous” resin has average pore diameter of greater than 10 nm.
• sulfuric acid refers to pure H 2 S0 4 , or to a mixture of H 2 S0 4 and water, or to a mixture of H2SC and sulfur trioxide, or to a mixture of H2SC , water, and sulfur trioxide.
• a solution contains a particular dissolved ionic species
• the solution may or may not contain one or more ionic species of the same charge as the particular ionic species, and it is to be understood that the solution will contain sufficient ionic species of the charge opposite to the particular ionic species in order to achieve balance of electrical charges.
• an organic solvent is a compound that contains carbon atoms and that is liquid over a temperature range that includes 15°C to 25 °C.
• a ratio is said herein to be X: 1 or greater, it is meant that the ratio is Y: 1, where Y is greater than or equal to X. For example, if a ratio is said to be 3: 1 or greater, that ratio may be 3: 1 or 5: 1 or 100: 1 but may not be 2:1.
• W: 1 or less it is meant that the ratio is Z: 1 , where Z is less than or equal to W. For example, if a ratio is said to be 15: 1 or less, that ratio may be 15: 1 or 10: 1 or 0.1: 1 but may not be 20: 1.
• the process of the present invention involves the use of solution (I).
• the solution (I) may be formed by any process.
• solution (I) is formed as follows: leaching uranium ore with sulfuric acid to produce an acid leach solution; then passing the acid leach solution through a strong base anion exchange resin to capture [U02(S04)3] 4" anions onto the resin; then removing the uranium from the resin by eluting with sulfuric acid to produce an eluate that contains dissolved sulfuric acid (H2SO4) and dissolved UO2 2"1" cations.
• the eluate may optionally be diluted with water prior to further use.
• the eluate or the diluted eluate is solution (I).
• the eluate is diluted prior to use as solution (I).
• the ratio of dilution water to eluate is, by weight, 0.4: 1 or more; more preferably 0.6: 1 or more; more preferably 0.8: 1 or more.
• the ratio of dilution water to eluate is, by weight, 8: 1 or less; more preferably 6: 1 or less; more preferably 4: 1 or less.
• Solution (I) is an aqueous solution that contains uranium and dissolved sulfuric acid.
• the concentration of uranium in solution (I), as elemental uranium is preferably 1 g/L or more; more preferably 2 g/L or more.
• the concentration of uranium in solution (I), as elemental uranium is 50 g/L or less; more preferably 20 g/L or less; more preferably 10 g/L or less.
• solution (I) contains dissolved sulfuric acid in an amount of 30 g/L or more; more preferably 40 g/L or more.
• solution (I) contains dissolved sulfuric acid in an amount of 200 g/L or less; more preferably 100 g/L or less.
• the pH of solution (I) is 2 or less.
• solution (I) is brought into contact with resin (I).
• Resin (I) is a strong acid cation exchange resin.
• the mole percent of polymerized units of resin (I) that contains one or more sulfonate groups is 50% or more; preferably 60% or more; more preferably 70% or more; more preferably 80% or more; more preferably 90% or more.
• the mole percent of polymerized units of resin (I) that contains one or more nitrogen-containing groups is 5% or less; more preferably 2% or less; more preferably 1% or less; more preferably zero.
• the mole percent of polymerized units of resin (I) that contains one or more phosphorous-containing groups is 5% or less; more preferably 2% or less; more preferably 1% or less; more preferably zero.
• the mole percent of polymerized units of resin (I) that contains one or more carboxyl groups is 5% or less; more preferably 2% or less; more preferably 1% or less; more preferably zero.
• resin (I) is a vinyl aromatic polymer.
• Preferred vinyl aromatic monomers are styrene and divinyl benzene.
• the amount of polymerized units of one or more vinyl aromatic monomer is, by weight based on the weight of the polymer, 75% or more; more preferably 90% or more; more preferably 95% or more.
• resin (I) contains polymerized units of one or more multivinyl monomer.
• the amount of polymerized units multivinyl monomer is, by weight based on the weight of resin (I), 2% or more; more preferably 4% or more; more preferably 8% or more; more preferably 10% or more; more preferably 12% or more; more preferably 14% or more.
• the amount of polymerized units multivinyl monomer is, by weight based on the weight of resin (I), 30% or less; more preferably 25% or less.
• resin (I) is made by a process that includes polymerizing a monomer or mixture of monomers that contains one or more monomers that are vinyl aromatic monomers that contain only carbon and hydrogen atoms, and then, after completion of the polymerization, performing one or more chemical reactions to attach one or more sulfonate groups to the aromatic rings in the polymer.
• the resin (I) is in the form of a collection of particles.
• the particles contain crosslinked polymer.
• the volume- average diameter of the collection of particles is 50 ⁇ or more; more preferably 100 ⁇ or more.
• the volume- average diameter of the collection of particles is 1,000 ⁇ or less.
• the amount of uranium in any form characterized as grams of elemental uranium per liter of resin, in resin
• (I) is 5 g/L or less; more preferably 1 g/L or less; more preferably 0.2 g/L or less.
• resin (I) is in protonated form.
• Solution (I) and resin (I) are brought into contact with each other to make a mixture. It is contemplated that some alterations in the compositions of solution (I) and resin (I) will take place, for example by transfer of U0 2 2+ cations from solution (I) to resin (I). When the mixture is separated into a liquid portion and a solid portion, the liquid portion will be the altered solution (I), now labeled solution (II); and the solid portion will be the altered resin (I), now labeled resin (II).
• resin (I) and resin (II) normally contain some water.
• resin (I) and resin (II) each independently preferably contains water in an amount, by weight based on the total weight of the resin, 1% to 60%.
• the steps of bringing solution (I) into contact with resin (I) and then separating solution (II) from resin (II) may be accomplished by any method.
• a preferred method is to provide a fixed bed of particles of resin (I) and then pass solution (I) through the fixed bed of particles of resin (I). The solution that exits from the fixed bed will be solution (II).
• the ratio of the concentration of uranium in solution (I) to the concentration of uranium in solution (II) is 10: 1 or more; more preferably 50: 1 or more.
• the process of passing solution (I) through the fixed bed of resin (I) is continued until the time when the uranium concentration in solution (II) begins to rise, for example until the ratio of the concentration of uranium in solution (I) to the concentration of uranium in solution (II) falls below 10: 1.
• the flow of solution (I) is preferably halted.
• the amount of dissolved compounds in solution (II) other than H 2 S0 4 is, by weight based on the weight of solution (II), 5% or less; more preferably 2% or less; more preferably 1% or less.
• solution (II) may be used as a source of sulfuric acid, for example as the sulfuric acid that is mixed with uranium ore to produce an acid leach solution.
• Uranium may be recovered from resin (II) by any method It is preferred to recover uranium from resin (II) and convert the uranium to the form of a precipitated diuranate salt. Two preferred methods are herein called "Option A” and "Option B.”
• Solution (III) is brought into contact with resin (II) to form a mixture.
• Solution (III) is an aqueous solution that contains dissolved HC1.
• the amount of HC1 dissolved in solution (III) is, by weight based on the weight of solution (III), 10% or more; more preferably 15% or more.
• the amount of HC1 dissolved in solution (III) is, by weight based on the weight of solution (III), 30% or less; more preferably 20% or less.
• the total amount of solutes in solution (III) other than HC1 is, by weight based on the weight of solution (III), 5% or less; more preferably 2% or less; more preferably 1% or less.
• Solution (III) and resin(II) are brought into contact with each other to make a mixture. It is contemplated that some alterations in the compositions of solution (III) and resin (II) will take place, for example by conversion of uranium from UC> 2 2+ cations resident on resin (II) to UO 2 CI 3 " dissolved in the water that is present. When the mixture is separated into a liquid portion and a solid portion, the liquid portion will be the altered solution (III), now labeled solution (IV); and the solid portion will be the altered resin (II), now labeled resin (III). It is contemplated that solution (IV) will contain dissolved UO 2 CI 3 " anions.
• the steps of bringing solution (III) into contact with resin (II) and then separating solution (IV) from resin (III) may be accomplished by any method.
• a preferred method is to provide a fixed bed of particles of resin (II) and then pass solution (III) through the fixed bed of particles of resin (II).
• the solution that exits from the fixed bed will be solution (IV).
• the previous step of mixing solution (I) with resin (I) is performed by passing solution (I) through a fixed bed of resin (I); then, preferably, the resulting resin (II) stays in the same fixed bed, and solution (III) is then passed through the fixed bed of resin (II).
• the process of passing solution (III) through the fixed bed of resin (II) is continued until the time when the uranium concentration in solution (II) begins to fall.
• the instantaneous concentration of uranium may be measured as a function of time as solution (IV) exits the fixed bed, and the maximum concentration may be noted. The time may be noted when the ratio of the instantaneous concentration of uranium in solution (IV) as it exits the fixed bed to the maximum concentration is 0.1: 1 or lower.
• the flow of solution (III) is preferably halted.
• resin (II) is considered to be depleted of UO 2 , and the depleted resin (II) is known herein as resin (III). It is contemplated that solution (IV) contains dissolved UO 2 CI 3 " ions.
• the amount of uranium, as elemental uranium, in resin (III) is 5 gram per liter of resin (g/L) or less; more preferably 1 g/L or less; more preferably 0.2 g/L or less.
• resin (III) could be used as resin (I) in a subsequent performance of the process of the present invention.
• solution (IV) is brought into contact with resin (IV).
• Resin (IV) is a strong base anion exchange resin or a weak base anion exchange resin, preferably a strong base anion exchange resin.
• the resin is preferably in chloride form.
• the resin is preferably in HC1 form.
• the resin (IV) is in the form of a collection of particles.
• the particles contain crosslinked polymer.
• the volume- average diameter of the collection of particles is 50 ⁇ or more; more preferably 100 ⁇ or more.
• the volume-average diameter of the collection of particles is 1,000 ⁇ or less.
• Resin (IV) is preferably a strong base anion exchange resin (SBA resin).
• Resin (IV) is preferably a gel type resin.
• Some examples of commercial resins that are suitable as resin (IV) are AMBERLITETM IRA400, AMBERLITETM IRA402, AMBERJETTM 4200, AMBERJETTM 4400, AMBERSEPTM 400, DOWEXTM MARATHONTM A, and DOWEXTM MONOSPHERETM 550A; among these six resins, preferred is AMBERLITETM IRA400.
• the amount of uranium in any form in resin (IV), characterized as grams of elemental uranium per liter of resin is 1 g/L or less; more preferably 0.3 g/L or less; more preferably 0.1 g/L or less.
• Solution (IV) and resin (IV) are brought into contact with each other to make a mixture. It is contemplated that some alterations in the compositions of solution (IV) and resin (IV) will take place, for example by transfer of UO 2 CI 3 " anions from solution (IV) to resin (IV). When the mixture is separated into a liquid portion and a solid portion, the liquid portion will be the altered solution (IV), now labeled solution (V); and the solid portion will be the altered resin (IV), now labeled resin (V). It is contemplated that solution (V) contains dissolved HC1. The ion exchange reaction is believed to be the following: RN + C1 " + [UO2CI3] " RN + [U0 2 C1 3 ] " + cr
• R represents the resin matrix together with the alkyl groups on the quaternary ammonium group.
• resin (IV) and resin (V) normally contain some water.
• Each of resin (IV) and resin (V) each independently preferably contains water in an amount, by weight based on the total weight of the resin, 1% to 60%.
• the steps of bringing solution (IV) into contact with resin (IV) and then separating solution (V) from resin (V) may be accomplished by any method.
• a preferred method is to provide a fixed bed of particles of resin (IV) and then pass solution (IV) through the fixed bed of particles of resin (IV).
• the solution that exits from the fixed bed will be solution (V).
• the ratio of the concentration of uranium in solution (IV) to the concentration of uranium in solution (V) is 10:1 or more; more preferably 50:1 or more.
• the process of passing solution (IV) through the fixed bed of resin (IV) is continued until the time when the uranium concentration in solution (V) begins to rise, for example until the ratio of the concentration of uranium in solution (IV) to the concentration of uranium in solution (V) falls below 10:1.
• the flow of solution (IV) is preferably halted.
• resin (V) is considered to be "loaded” with UO 2 CI 3 " , associated with the ammonium groups on resin (V).
• solution (V) is an aqueous solution that contains dissolved HC1.
• the preferred characteristics of solution (V) are the same as those of solution (III), though the characteristics of the two solutions may be chosen independently.
• solution (V) is recycled and used as source for all or part of solution (III).
• solution (V) qualifies for use as solution (III).
• resin (V) contains uranium in the form of UO 2 CI 3 " .
• This uranium may be removed from resin (V) by any method.
• a preferred method is to bring solution (VI) into contact to form a mixture.
• solution (VI) contains water in an amount, by weight based on the weight of solution (VI), 95% or more; more preferably 97% or more; more preferably 99% or more.
• Solution (VI) and resin(V) are brought into contact with each other to make a mixture. It is contemplated that some alterations in the compositions of solution (VI) and resin (V) will take place, for example by conversion of uranium from UO 2 CI 3 " anions resident on resin (V) to UO 2 CI 2 dissolved in the water that is present.
• solution (VII) contains dissolved UO 2 CI 2 .
• the steps of bringing solution (VI) into contact with resin (V) and then separating solution (VII) from resin (VI) may be accomplished by any method.
• a preferred method is to provide a fixed bed of particles of resin (V) and then pass solution (VI) through the fixed bed of particles of resin (V).
• the solution that exits from the fixed bed will be solution (VII).
• the previous step of mixing solution (IV) with resin (IV) was performed by passing solution (IV) through a fixed bed of resin (IV); then, preferably, the resulting resin (V) stays in the same fixed bed, and solution (VI) is then passed through the fixed bed of resin (V).
• the process of passing solution (VI) through the fixed bed of resin (V) is continued until the time when the uranium concentration in solution (II) begins to fall.
• the instantaneous concentration of uranium may be measured as solution (VII) exits the fixed bed, and the maximum concentration may be noted.
• the time may be noted when the ratio of the instantaneous concentration of uranium in solution (VII) as it exits the fixed bed to the maximum concentration is 0.1 : 1 or lower.
• the flow of solution (VI) is preferably halted.
• resin (V) is considered to be depleted of UO 2 CI 3 " , and the depleted resin (V) is known herein as resin (VI).
• the amount of uranium, as elemental uranium, in resin (VI) is 1 gram per liter of resin (g/L) or less; more preferably 0.3 g/L or less; more preferably 0.1 g/L or less.
• resin (VI) could be used as resin (IV) in a subsequent performance of the Option A process of the present invention.
• solution (VII) is brought into contact with a hydroxide to form a mixture, and the corresponding diuranate salt precipitates.
• the diuranate salt is considered to be a useful form of uranium that is appropriate for various uses.
• Preferred hydroxides are sodium hydroxide and ammonium hydroxide, which produce precipitates of sodium diuranate (SDU) and ammonium diuranate (ADU), respectively.
• the SAC resin is eluted with HC1, and the uranium is eluted as anionic chloride complex.
• This eluate passes through a strong or weak base anion exchange resin in the CI " form where uranium is fixed while HC1 comes out and is recovered.
• Uranium is then eluted from the anion exchanger with water. In this way only a small quantity of chemicals is consumed, which is the HC1 that is eluted along with the uranium in the water elution step.
• uranium is recovered by precipitation with NaOH or ammonia as SDU or ADU.
• the flow sheet is shown in figure 4.
• Solution (X) is brought into contact with resin (II) to form a mixture.
• Solution (X) is an aqueous solution that contains dissolved Na 2 S0 4 or dissolved (NH 4 ) 2 S0 4 ; preferably dissolved Na 2 S0 4 .
• the amount of dissolved Na 2 S0 4 or dissolved (NH 4 ) 2 S0 4 in solution (X) is, by weight based on the weight of solution (X), 1% or more; more preferably 2% or more; more preferably 5% or more.
• the amount of dissolved Na 2 S0 4 or dissolved (NH 4 ) 2 S0 4 in solution (X) is, by weight based on the weight of solution (X), 25% or less; more preferably 20% or less; more preferably 15% or less.
• the total amount of solutes in solution (X) other than Na 2 S0 4 or (NH 4 ) 2 S0 4 , by weight based on the weight of solution (X), is 5% or less; more preferably 2% or less; more preferably 1% or less.
• Solution (X) and resin(II) are brought into contact with each other to make a mixture. It is contemplated that some alterations in the compositions of solution (X) and resin (II) will take place, for example by conversion of uranium from U0 2 2+ cations resident on resin (II) to U0 2 S0 4 2" dissolved in the water that is present.
• the liquid portion will be the altered solution (X), now labeled solution (XI); and the solid portion will be the altered resin (II), now labeled resin (XI).
• solution (XI) will contain dissolved [0072]
• the steps of bringing solution (X) into contact with resin (II) and then separating solution (XI) from resin (XI) may be accomplished by any method.
• a preferred method is to provide a fixed bed of particles of resin (II) and then pass solution (X) through the fixed bed of particles of resin (II).
• the solution that exits from the fixed bed will be solution (XI).
• the previous step of mixing solution (I) with resin (I) was performed by passing solution (I) through a fixed bed of resin (I); then, preferably, the resulting resin (II) stays in the same fixed bed, and solution (X) is then passed through the fixed bed of resin (II).
• the process of passing solution (X) through the fixed bed of resin (II) is continued until the time when the uranium concentration in solution (XI) begins to fall.
• the instantaneous concentration of uranium may be measured as solution (XI) exits the fixed bed, and the maximum concentration may be noted. The time may be noted when the ratio of the instantaneous concentration of uranium in solution (XI) as it exits the fixed bed to the maximum concentration is 0.1 : 1 or lower.
• the flow of solution (X) is preferably halted.
• resin (II) is considered to be depleted of UC>2 2+ , and the depleted resin (II) is known herein as resin (XI). It is contemplated that solution (XI) contains dissolved Na 2 S0 4 and dissolved [U0 2 (S0 4 ) 3 ] 2" .
• the amount of uranium, as elemental uranium, in resin (XI) is 1 gram per liter of resin (g/L) or less; more preferably 0.3 g/L or less; more preferably 0.1 g/L or less.
• resin (XI) could be used as resin (I) in a subsequent performance of the process of the present invention.
• solution (XI) is brought into contact with a hydroxide salt to form a mixture, and the corresponding diuranate salt precipitates.
• the diuranate salt is considered to be a useful form of uranium that is appropriate for various uses.
• Preferred hydroxide salts are sodium hydroxide and ammonium hydroxide, which produce, respectively, precipitate of sodium diuranate (SDU) and ammonium diuranate (ADU).
• the remaining liquid which contains dissolved Na 2 S0 4 , may be used as all or part of solution (X).
• resin (XI) could be subjected to an additional step in order to remove residual Na 2 S0 4 that may be present.
• Solution (XII) is brought into contact with resin (XI) to form a mixture.
• Solution (XII) is an aqueous solution that contains dissolved ]3 ⁇ 480 4 .
• the amount of dissolved ]3 ⁇ 4S0 4 in solution (XII) is, by weight based on the weight of solution (XII), 1% or more; more preferably 2% or more; more preferably 5% or more.
• the amount of dissolved ]3 ⁇ 4S0 4 in solution (XII) is, by weight based on the weight of solution (XII) , 20% or less; more preferably 15% or less; more preferably 10% or less.
• the total amount of solutes in solution (XII) other than H 2 SO 4 is 5% or less; more preferably 2% or less; more preferably 1% or less.
• Solution (XII) may contain a freshly prepared solution, or solution (XII) may contain material obtained from solution (II), or solution (XII) may contain a mixture thereof.
• Solution (XII) and resin(XI) are brought into contact with each other to make a mixture. It is contemplated that some alterations in the compositions of solution (XII) and resin (XI) will take place, for example by transfer of Na + ions from resin (XI) to becoming dissolved in the water that is present. When the mixture is separated into a liquid portion and a solid portion, the liquid portion will be the altered solution (XII), now labeled solution
• the steps of bringing solution (XII) into contact with resin (XI) and then separating solution (XIII) from resin (XII) may be accomplished by any method.
• a preferred method is to provide a fixed bed of particles of resin (XI) and then pass solution (XII) through the fixed bed of particles of resin (II).
• the solution that exits from the fixed bed will be solution (XIII).
• the previous step of mixing solution (X) with resin (II) was performed by passing solution (X) through a fixed bed of resin (II); then, preferably, the resulting resin (XI) stays in the same fixed bed, and solution (XII) is then passed through the fixed bed of resin (XI).
• the process of passing solution (XII) through the fixed bed of resin (XI) is continued until the time when the sodium concentration in solution (XI) begins to fall.
• the instantaneous concentration of sodium may be measured as solution (XIII) exits the fixed bed, and the maximum concentration may be noted.
• the time may be noted when the ratio of the instantaneous concentration of sodium in solution (XIII) as it exits the fixed bed to the maximum concentration is 0.1:1 or lower.
• the flow of solution (XII) is preferably halted.
• resin (XI) is considered to be depleted of sodium, and the depleted resin (XI) is known herein as resin (XII). It is contemplated that solution (XIII) contains dissolved Na 2 S0 4 .
• solution (XIII) is an aqueous solution that contains dissolved Na 2 S0 4 .
• the preferred characteristics of solution (XIII) are the same as those of solution (X), though the characteristics of the two solutions may be chosen independently.
• solution (XIII) is recycled and used as source for all or part of solution (X).
• a step can optionally be included where the resin is oversaturated with part of the solution (XI).
• liquid solutions are conveyed from one location to another.
• the liquid solutions may be moved by the force of gravity or may be driven by one or more pumps.
• the liquid solutions may be conveyed through pipes or tubes of any shape of cross section or may be conveyed by any other object capable of conveying liquid from one location to another.
• a source 1 supplies solution (I).
• the source may be any vessel or container.
• Solution (I) passes through a pipe 2 into a container 3 that holds resin (I) but allows liquid solution to pass through, after making intimate contact with resin (I).
• Solution (II) exits from container 3 via pipe 4.
• Figure 2 shows the same features as Figure 1, and Figure 2 also shows the features of an embodiment of Option A.
• solution (I) has passed through container 3 for a time until resin (I) is loaded, the flow of solution (I) is halted. Then, as shown in Figure 2, the flow of solution (III) is begun, from a source 5.
• the source may be any vessel or container.
• Solution (III) passes through a pipe 6 into container 3 that holds resin (II) but allows liquid solution to pass through.
• Solution (IV) exits from container 3 via pipe 7.
• Solution (IV) then enters container 8, which contains resin (IV).
• Solution (IV) passes over resin (IV), and solution (IV) becomes solution (V) and resin (IV) becomes resin (V).
• Solution (V) exits container 8 via pipe 9.
• solution (III) is halted, thus also halting the flow of solutions (IV) and (V).
• the flow of solution (VI) is begun, from a source 10.
• the source may be any vessel or container.
• Solution (VI) passes through a pipe 11 into container 8.
• Solution (VI) exits from container 8 via pipe 12.
• Solution (VI) passes over resin (V), and solution (VI) becomes solution (VII), and resin (V) becomes resin (VI).
• Solution (VII) exits container 8 via pipe 12.
• Figure 3 shows the same features as Figure 1, and Figure 3 also shows the features of an embodiment of Option B.
• solution (I) has passed through container 3 for a time until resin (I) is loaded, the flow of solution (I) is halted. Then, as shown in Figure 3, the flow of solution (X) is begun, from a source 13.
• the source may be any vessel or container.
• Solution (X) passes through a pipe 14 into container 3.
• Solution (X) passes over resin (II), and solution (X) becomse solution (XI) while resin (II) becomes resin (XI).
• Solution (XI) exits from container 3 via pipe 15.
• Figure 3 also shows an optional further step in Option B, in which, after the flow of solution (X) is halted, the flow of solution (XII) is begun.
• An additional source supplies solution (XII) to container 3.
• the source may be any vessel or container.
• Solution (XII) passes through a pipe 17 into container 3.
• Solution (XII) passes over resin (XI), and solution (XII) becomes solution (XIII) while resin (XI) becomes resin (XII).
• Solution (XIII) exits from container 3 via pipe 18.
• Figure 4 shows a flow sheet for an embodiment of Option A.
• Figure 5 shows a flow sheet for an embodiment of Option B.
• scrubbing of the loaded resin can be done with part of the concentrated eluate ( Figure 6) where the resin is overloaded/saturated with uranium and less with H+ which then can be recovered.
• the process of the present invention does not involve the use of any organic solvent.
• solution (II) is expected to be a solution of sulfuric acid in water, and it is expected that that solution can be recycled to make use of the sulfuric acid.
• the resin is considered to be saturated when the ratio of the concentration of uranium in the effluent to the concentration of uranium in solution (I) is 0.95: 1 or higher. This is the loading capacity of the head column in a three column merry- go-round configuration (two on loading and one on regeneration).
• Example IB Option A
• the lost HC1 quantity could be reduced by for example, draining the resins before the water elution.
• the uranium loading capacity was measured as follows. An initial solution of uranium of uranium and sulfuric acid was prepared and a volume Vs of this solution was mixed with a given volume of resin VR. Uranium
• Example 4 Comparison of resins [0106] The method of Example 3 was repeated, using 4% sulfuric acid and three different resins. The properties of the resins were as follows. "DVB" is the amount of polymerized units of divinylbenzene in weight % based on the weight of resin.

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• 2017
  • 2017-03-15 AU AU2017274261A patent/AU2017274261A1/en not_active Abandoned
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