GB2144111A - Extraction of metal ions - Google Patents
Extraction of metal ions Download PDFInfo
- Publication number
- GB2144111A GB2144111A GB08417696A GB8417696A GB2144111A GB 2144111 A GB2144111 A GB 2144111A GB 08417696 A GB08417696 A GB 08417696A GB 8417696 A GB8417696 A GB 8417696A GB 2144111 A GB2144111 A GB 2144111A
- Authority
- GB
- United Kingdom
- Prior art keywords
- thorium
- uranium
- nitric acid
- extraction
- metal ions
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 229910021645 metal ion Inorganic materials 0.000 title claims abstract description 13
- 238000000605 extraction Methods 0.000 title claims description 6
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 17
- ZSLUVFAKFWKJRC-IGMARMGPSA-N 232Th Chemical compound [232Th] ZSLUVFAKFWKJRC-IGMARMGPSA-N 0.000 claims abstract description 15
- 229910052776 Thorium Inorganic materials 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 12
- 229910052770 Uranium Inorganic materials 0.000 claims abstract description 10
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 claims abstract description 10
- PTMHPRAIXMAOOB-UHFFFAOYSA-N phosphoramidic acid Chemical compound NP(O)(O)=O PTMHPRAIXMAOOB-UHFFFAOYSA-N 0.000 claims abstract description 4
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910052781 Neptunium Inorganic materials 0.000 claims abstract description 3
- 229910052778 Plutonium Inorganic materials 0.000 claims abstract description 3
- 229910052768 actinide Inorganic materials 0.000 claims abstract description 3
- 150000001255 actinides Chemical class 0.000 claims abstract description 3
- 239000003456 ion exchange resin Substances 0.000 claims abstract description 3
- 229920003303 ion-exchange polymer Polymers 0.000 claims abstract description 3
- LFNLGNPSGWYGGD-UHFFFAOYSA-N neptunium atom Chemical compound [Np] LFNLGNPSGWYGGD-UHFFFAOYSA-N 0.000 claims abstract description 3
- OYEHPCDNVJXUIW-UHFFFAOYSA-N plutonium atom Chemical compound [Pu] OYEHPCDNVJXUIW-UHFFFAOYSA-N 0.000 claims abstract description 3
- 239000011347 resin Substances 0.000 claims description 10
- 229920005989 resin Polymers 0.000 claims description 10
- 230000002378 acidificating effect Effects 0.000 claims description 7
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 claims description 2
- 239000001099 ammonium carbonate Substances 0.000 claims description 2
- 235000012501 ammonium carbonate Nutrition 0.000 claims description 2
- 239000002253 acid Substances 0.000 abstract description 4
- 239000012141 concentrate Substances 0.000 abstract description 4
- XLROVYAPLOFLNU-UHFFFAOYSA-N protactinium atom Chemical compound [Pa] XLROVYAPLOFLNU-UHFFFAOYSA-N 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000003758 nuclear fuel Substances 0.000 abstract description 2
- 238000003860 storage Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 5
- 229910021653 sulphate ion Inorganic materials 0.000 description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 4
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 4
- 239000011575 calcium Substances 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 239000011734 sodium Substances 0.000 description 4
- 229910052791 calcium Inorganic materials 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 229910052708 sodium Inorganic materials 0.000 description 3
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- VCJMYUPGQJHHFU-UHFFFAOYSA-N iron(3+);trinitrate Chemical compound [Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VCJMYUPGQJHHFU-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 2
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 229910001447 ferric ion Inorganic materials 0.000 description 1
- 150000002222 fluorine compounds Chemical class 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 239000004317 sodium nitrate Substances 0.000 description 1
- 235000010344 sodium nitrate Nutrition 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 239000001117 sulphuric acid Substances 0.000 description 1
- 235000011149 sulphuric acid Nutrition 0.000 description 1
- ZSLUVFAKFWKJRC-YPZZEJLDSA-N thorium-230 Chemical compound [230Th] ZSLUVFAKFWKJRC-YPZZEJLDSA-N 0.000 description 1
- ZSLUVFAKFWKJRC-NJFSPNSNSA-N thorium-234 Chemical compound [234Th] ZSLUVFAKFWKJRC-NJFSPNSNSA-N 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
- 229910002007 uranyl nitrate Inorganic materials 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
- G21F9/04—Treating liquids
- G21F9/06—Processing
- G21F9/12—Processing by absorption; by adsorption; by ion-exchange
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F15/00—Compounds of thorium
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G56/00—Compounds of transuranic elements
- C01G56/001—Preparation involving a liquid-liquid extraction, an adsorption or an ion-exchange
- C01G56/002—Preparation involving a liquid-liquid extraction, an adsorption or an ion-exchange by adsorption or by ion-exchange on a solid support
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Inorganic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Physics & Mathematics (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
A method for extracting metal ions having a high charge and a small ionic radius and in the tetravalent state, from acid liquors involves the step of contacting the liquor with a chelating aminophosphonic acid ion exchange resin, known per se. The method is particularly effective for extracting thorium and other radionuclides from nitric acid raffinates arising during the production of pure uranium for nuclear fuel from uranium ore concentrates. The method can also be applied to the removal of parts per million amounts of actinides such as plutonium, neptunium, protoactinium and uranium from acid liquors destined for disposal or storage.
Description
SPECIFICATION
Extraction of some metal ions from nitric acid liquors
This invention relates to the extraction of some metal ions from acid liquors.
In the production of nuclear fuel material several sequential processes are necessary to convert uranium ore concentrates to other uranic compounds. In one of these processes the uranium ore concentrate is dissolved in nitric acid and the uranium in the resultant uranyl nitrate liquor is then separated from the impurities which are liberated from the ore concentrate with the uranium, predominantly as nitrates. The separation is effected by a solvent extraction procedure from which an acidic raffinate rich in nitric acid but contaminated with the impurities is usually discarded. The major impurities are the alkali and alkaline earth metals, aluminium, some first and second row transition metals, non-uranic radionuclides and various anionic species such as fluorides and sulphates.The radionuclides are principally uranium daughters (protoactinium 234 and thorium 234), thorium 230 and the natural thorium isotope Th 232.
The present invention in one of its aspects seeks to remove such radionuclides from the nitric acid raffinate so that, after further treatment, the nitric acid can be recycled to the dissolution process.
According to the present invention, metal ions having a high charge and a small ionic radius and in the tetravalent state can be extracted from acidic liquors by contracting the liquor with a chelating aminophosphonic acid ion exchange resin, known per se.
One example of a metal ion as specified in the preceding paragraph is thorium. Another is protoactinium. The said resin can therefore be employed to remove these radionuclides from nitric acid raffinates as aforesaid. An advantage of a chelating amino-phosphonic acid resin is that its ability to absorb thorium and protoactinium from a plant nitric acid raffinate is not normally impaired by nitric acid concentration nor the presence of foreign ions such as sodium, calcium or sulphate. Indeed, it has been established that high nitric acid values (6M) and higher temperatures (of approximately 50"C) can improve the distribution of thorium.This advantage is shown by the results obtained by determining the thorium distribution (KdTh) and the thorium capacity of the resin Duolite ES 467 (obtainable from Dia-Prosim Ltd, Hounslow, Middlesex) using a plant nitric acid raffinate of which some of the major constituents are given in the following Table I.
TABLE I
Composition of Plant Raffinate
Element Composition
Nitric acid acidity 9.6% w/v (1.52M)
Total Nitrate 11.0% w/v
Sulphate 0.44% w/v
Fluoride 0.11 % w/v
Aluminium 880 mg/l
Iron (total) 720 mg/l
Calcium 700 mg/i
Sodium 450 mg/l
Magnesium 200 mg/l
Potassium 140 mg/l
Thorium 130 mg/l
Results are depicted graphically in the accompanying Figs. and in Tables II and Ill. Fig. 1 shows the effect of varying the nitric acid concentration and temperature. Fig. 2 shows the effect of thorium concentration. The influence of sodium, calcium and ferric ions on the thorium distribution is indicated in the following Table II and the effect of sulphate concentration in the following Table Ill.
TABLE II
The Effect of Sodium, Calcium and Iron (111) Concentration of KdTh Value
Metal ion in equilibrium with the Resin
Na Ca Fe
Initial Metal Ion 0.45 1.2 5.0 0.78 1.9 6.5 0.72 1.8 5.8 concentration g/l
KdTh Value 176 162 200 176 212 200 176 70 13
TABLE 111
The Effect of Sulphate Concentration on Kd Values
Initial Sulphate concentration g/l Fe Ca Th
4.4 7 1 176 13.0 4 2 171 38.0 2 2 186
For the results in Fig. 1 the nitric acid value of the plant raffinate as received was reduced using the ion-retardation resin AG11-A8 from Bio-Rad Laboratories and increased by the addition of the appropriate quantity of concentrated acid. 10g of the nitric acid pre-conditioned resin was equilibrated at a constant temperature ( + 2"C) with 100 ml of the appropriate raffinate solutions for 1 hour in a stoppered flask and the distribution values of thorium determined as beta activity, the procedure being carried out at 25, 35, 45 and 55"C. For the results in Fig. 2 10g of preconditioned resin was equilibrated at 25 + 2"C with successive 100 ml portions of as received plant raffinate until the beta activity of the equilibrated sample was constant. The beta activity removed was converted to the corresponding thorium value. For the results in Tables II and Ill appropriate amounts of sodium nitrate, calcium nitrate, ferric nitrate and sulphuric acid were added to portions of the plant raffinate and the procedure followed as for Fig. 1, the temperature being 25 + 2"C.
Thorium may be eluted from the resin with 0.5M ammonium carbonate.
Further examples of metal ions as aforesaid are actinides such as plutonium, neptunium and uranium when in tetravalent state. The employment of a resin as aforesaid is advantageous in its ability to remove small quantities, in the parts per million range, of such metals from waste acidic liquors before discharge or storage.
Claims (5)
1. A method of extraction from acidic liquors of metal ions having a high charge and a small ionic radius and in the tetravalent state, including the step of contacting the liquor with a chelating aminophosphonic acid ion exchange resin, known per se.
2. A method according to claim 1, wherein the acidic liquor is a nitric acid raffinate, and the metal ion for extraction is thorium.
3. A method according to claim 2, including the additional step of eluting thorium from the said resin employing ammonium carbonate.
4. A method according to claim 1, wherein the acidic liquor is a nitric acid raffinate, and the metal ion is or are one or more of the actinides plutonium, neptunium and uranium, all in the tetravalent state and present in the raffinate in concentrations of the order of parts per million.
5. A method of extraction from acidic liquors of metal ions having a high charge and a small ionic radius and in the tetravalent state, substantially as herein described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08417696A GB2144111B (en) | 1983-07-22 | 1984-07-11 | Extraction of metal ions |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB838319838A GB8319838D0 (en) | 1983-07-22 | 1983-07-22 | Extraction of thorium from nitric acid liquors |
| GB08417696A GB2144111B (en) | 1983-07-22 | 1984-07-11 | Extraction of metal ions |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8417696D0 GB8417696D0 (en) | 1984-08-15 |
| GB2144111A true GB2144111A (en) | 1985-02-27 |
| GB2144111B GB2144111B (en) | 1986-12-17 |
Family
ID=26286674
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08417696A Expired GB2144111B (en) | 1983-07-22 | 1984-07-11 | Extraction of metal ions |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2144111B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0209048A1 (en) * | 1985-07-10 | 1987-01-21 | Hitachi, Ltd. | Process and apparatus for cleaning nuclear reactor cooling water |
| EP0532919A1 (en) * | 1991-09-19 | 1993-03-24 | Siemens Power Corporation | Method for removing a heavy metal from a waste stream |
| EP0621801A1 (en) * | 1991-10-10 | 1994-11-02 | Brigham Young University | Aminoalkylphosphonic acid containing ligands attached to solid supports for removal of metal ions |
| AT401122B (en) * | 1994-05-09 | 1996-06-25 | Oesterr Forsch Seibersdorf | Method for stabilizing ion exchange resins loaded with radioactive materials, and products stabilized in such a way |
| EP1085527A2 (en) * | 1999-09-17 | 2001-03-21 | Siemens Power Corporation | Treatment process for removing radioactive thorium from solvent extraction liquid effluent |
| RU2454742C1 (en) * | 2010-12-23 | 2012-06-27 | Федеральное государственное унитарное предприятие "Научно-производственное объединение "Радиевый институт им. В.Г. Хлопина" | Method for processing of spent nuclear fuel of nuclear power plants |
| US8557201B1 (en) | 2012-08-08 | 2013-10-15 | Rohm And Haas Company | Method for the recovery of uranium from pregnant liquor solutions |
| RU2638543C1 (en) * | 2017-02-14 | 2017-12-14 | Федеральное государственное унитарное предприятие "Горно-химический комбинат" (ФГУП "ГХК") | Method of producing mixed uranium-plutonium oxide |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB972943A (en) * | 1962-10-08 | 1964-10-21 | Dow Chemical Co | Method for separating thorium and yttrium values |
| GB1430776A (en) * | 1972-09-09 | 1976-04-07 | Bayer Ag | Process for separating the actinide elements |
-
1984
- 1984-07-11 GB GB08417696A patent/GB2144111B/en not_active Expired
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB972943A (en) * | 1962-10-08 | 1964-10-21 | Dow Chemical Co | Method for separating thorium and yttrium values |
| GB1430776A (en) * | 1972-09-09 | 1976-04-07 | Bayer Ag | Process for separating the actinide elements |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4880595A (en) * | 1985-07-10 | 1989-11-14 | Hitachi, Ltd. | Process and apparatus for cleaning nuclear reactor cooling water |
| EP0209048A1 (en) * | 1985-07-10 | 1987-01-21 | Hitachi, Ltd. | Process and apparatus for cleaning nuclear reactor cooling water |
| US6165367A (en) * | 1991-09-19 | 2000-12-26 | Siemens Power Corporation | Method for removing a heavy metal from a waste stream |
| EP0532919A1 (en) * | 1991-09-19 | 1993-03-24 | Siemens Power Corporation | Method for removing a heavy metal from a waste stream |
| EP0621801A1 (en) * | 1991-10-10 | 1994-11-02 | Brigham Young University | Aminoalkylphosphonic acid containing ligands attached to solid supports for removal of metal ions |
| EP0621801A4 (en) * | 1991-10-10 | 1995-04-26 | Univ Brigham Young | Aminoalkylphosphonic acid containing ligands attached to solid supports for removal of metal ions. |
| AT401122B (en) * | 1994-05-09 | 1996-06-25 | Oesterr Forsch Seibersdorf | Method for stabilizing ion exchange resins loaded with radioactive materials, and products stabilized in such a way |
| EP1085527A2 (en) * | 1999-09-17 | 2001-03-21 | Siemens Power Corporation | Treatment process for removing radioactive thorium from solvent extraction liquid effluent |
| EP1085527A3 (en) * | 1999-09-17 | 2004-06-23 | Framatome ANP, Inc. | Treatment process for removing radioactive thorium from solvent extraction liquid effluent |
| US6991731B2 (en) | 1999-09-17 | 2006-01-31 | Framatome Anp Inc. | Treatment process for removing radioactive thorium from solvent extraction liquid effluent |
| RU2454742C1 (en) * | 2010-12-23 | 2012-06-27 | Федеральное государственное унитарное предприятие "Научно-производственное объединение "Радиевый институт им. В.Г. Хлопина" | Method for processing of spent nuclear fuel of nuclear power plants |
| US8557201B1 (en) | 2012-08-08 | 2013-10-15 | Rohm And Haas Company | Method for the recovery of uranium from pregnant liquor solutions |
| RU2638543C1 (en) * | 2017-02-14 | 2017-12-14 | Федеральное государственное унитарное предприятие "Горно-химический комбинат" (ФГУП "ГХК") | Method of producing mixed uranium-plutonium oxide |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8417696D0 (en) | 1984-08-15 |
| GB2144111B (en) | 1986-12-17 |
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