WO2002020408A1 - Procede de separation de metaux tels que le zirconium et l'hafnium - Google Patents
Procede de separation de metaux tels que le zirconium et l'hafnium Download PDFInfo
- Publication number
- WO2002020408A1 WO2002020408A1 PCT/FR2001/002806 FR0102806W WO0220408A1 WO 2002020408 A1 WO2002020408 A1 WO 2002020408A1 FR 0102806 W FR0102806 W FR 0102806W WO 0220408 A1 WO0220408 A1 WO 0220408A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- ligand
- zirconium
- hafnium
- metal
- metals
- Prior art date
Links
- OBJBJMOKTXMNFR-UHFFFAOYSA-N NC(CN(CCN(CC(N)=O)CC(O)=O)CC(O)=O)=O Chemical compound NC(CN(CCN(CC(N)=O)CC(O)=O)CC(O)=O)=O OBJBJMOKTXMNFR-UHFFFAOYSA-N 0.000 description 1
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
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G25/00—Compounds of zirconium
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G27/00—Compounds of hafnium
-
- 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
- C22B3/16—Extraction of metal compounds from ores or concentrates by wet processes by leaching in organic solutions
- C22B3/1608—Leaching with acyclic or carbocyclic agents
- C22B3/1616—Leaching with acyclic or carbocyclic agents of a single type
-
- 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
- C22B34/00—Obtaining refractory metals
- C22B34/10—Obtaining titanium, zirconium or hafnium
- C22B34/14—Obtaining zirconium or hafnium
-
- 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
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S210/00—Liquid purification or separation
- Y10S210/902—Materials removed
- Y10S210/911—Cumulative poison
- Y10S210/912—Heavy metal
Definitions
- the present invention relates to a process allowing the separation of certain metals, in particular the separation of zirconium and hafnium.
- Zirconium has a very small neutron capture section and for this reason it is used in nuclear reactors.
- the zircon ore always contains hafnium, at a rate of approximately 1 to 3% by weight. Unlike zirconium, hafnium strongly absorbs neutrons. The use of zirconium in the nuclear field therefore requires the prior elimination of hafnium, a content of less than 100 ppm is often recommended.
- Zirconium has other applications in which its purification is desirable. For example, in stainless superalloys, the elimination of hafnium is also sought.
- Hafnium and zirconium have very similar properties and their separation is made extremely difficult.
- a carbochlorination of the ore is carried out, which produces the tetrachlorides ZrCI 4 and HfCI 4 , then a separation either by extractive distillation of the two tetrachlorides or by liquid-liquid extraction after dissolving the chlorides.
- Zr0 2 and Hf0 2 which then requires a new carbochlorination of zirconium before proceeding to the recovery phase of the metal Zr.
- the first more efficient process consists of a distillation in molten salts which allows to keep the tetrachloride form, thus eliminating the second carbochlorination.
- the temperature is generally between 250 and 550 ° C. See for example FR-A-2 250 707 and US-A-4 021 531.
- the object of the invention is to propose a new process making it possible to efficiently separate zirconium from hafnium.
- Another object of the invention is to propose such a process which can be applied to the separation of zirconium and hafnium from the starting ore or from any fraction.
- Another objective of the invention is to propose such a process operating at a lower temperature than the previous processes, and with lower operating costs.
- zirconium and hafnium once hydrolyzed in the aqueous phase, tend to form polymers and / or copolymers of the type - (0-M (OH) 2 ) n - whose molar mass is probably higher than the cutoff threshold for nanofiltration membranes, which excludes their use and the application of the method disclosed in the document above.
- the applicant then surprisingly found that it is possible to separate the zirconium and the hafnium using a complexation-filtration method.
- the present invention therefore relates to a process for separating a metal 1 from a metal 2, from a solution of these metals in an aqueous medium, eg water, in which these metals are in a state which does not allow them no crossing a nanofiltration membrane, process in which the aqueous medium is treated with a ligand complexing with metal 1 and / or metal 2, for example with zirconium and / or hafnium, then passing the medium thus treated on a filtration membrane allowing ligand / metal complexes to pass, but retaining the metal not complexed with the ligand.
- an aqueous medium eg water
- the ligand used has a complexing constant with the metal, eg with Zr - and Hf, sufficiently high to "break" the polymers and therefore form ligand-metal complexes whose molecular mass is lower than that of the polymers and at the cutoff threshold. of the filtration membrane.
- Zr, Hf, Al, Ti, Si As metals targeted by the invention, there may be mentioned: Zr, Hf, Al, Ti, Si. It can thus be Zr-Ti, Al-Si couples and more particularly the Zr-Hf couple.
- metals are in the form of salts.
- the aqueous medium in which the metals are in solution and in the polymeric state is preferably at acidic pH and more particularly at strongly acidic pH.
- the pH naturally depends on the metals treated.
- the upper limit is the pH at which the metals begin to precipitate.
- the lower limit can be imposed by the resistance of the filtration membrane to acidic conditions and by the behavior of metals.
- the pH will be less than or equal to 4, in particular between 1 and 4, preferably between 2 and 4 (in all the intervals indicated here, the limits are included). These ranges of values are perfectly suitable for the separation of Zr and Hf.
- Filtration membrane and ligand are chosen one according to the other. More precisely, the cutoff threshold of the membrane must be such that the ligand-metal complex can cross the membrane. On the other hand, it goes without saying that the cut-off threshold of the membrane must be such that the polymer formed by metals in an aqueous medium cannot pass through the membrane. Routine tests allow those skilled in the art to select the best ligand / membrane compromise.
- nanofiltration membranes can be used in particular with cutoff thresholds of between 200 and 2000 g / mol (they can thus be used for ligand-metal complexes having a molar mass allowing them to cross the membrane considered, by example of molar mass of between approximately 200 and 2000 g / mol) and ultrafiltration membranes whose cutoff thresholds are greater than 2000 g / mol.
- EDTA forms with zirconium and hafnium complexes whose size is between 400 and 500 g / m ⁇ l and a nanofiltration membrane having a cutoff threshold of about 1000 g / mol is revealed adapted.
- the ligand the ideal is to use a specific ligand for one of the two metals to be separated, which leads to an optimal separation rate.
- zirconium and hafnium such a ligand complexes with zirconium or hafnium.
- the quantity of ligand selected is then chosen to have the best separation rate.
- the ligand must be water-soluble, as well as the complexes that it forms with the metal in solution.
- the ligand is preferably organic.
- They are preferably compounds of polyamino acid type, in particular those corresponding to formula (1):
- hydrophilic radicals in particular of the OH or NR 1 R 2 type with R 1 and R 2 identical or different, each corresponding to hydrogen or to a hydrophilic monovalent radical preferably selected from amino and / or (poly) hydroxylated and / or (poly) etherified hydrocarbon radicals, these radicals preferably being of the cycloalkyl, aralkyl, alkylaryl, cycioalkenyl, aralkenyl, alkenylaryl or aryl type, the number of atoms of which of carbon can vary within wide proportions: the molecular mass of the compound follows, as well as the choice of a filtration membrane having a cutoff threshold greater than this molecular mass; generally, these residues will in particular have from 2 to 50 carbon atoms, preferably from 4 to 25; as well as cyclic polyamino acids, such as for example cyclic polyaminocarboxylates, such as DOTA
- Diamido-EDTA can be produced from commercial EDTA anhydride (e.g. Aldrich), by reacting NH3 in an aqueous medium. It can also be produced using the method described in Roy P. Houghton at Williams Emyr; JCPRB4; J. Chem. Soc. Perkin Trans. 1; IN ; 11; 1982; 2693-2696.
- commercial EDTA anhydride e.g. Aldrich
- the water-soluble ligand according to the invention is added to the aqueous medium to be treated.
- the amount of ligand added is preferably such that the ratio ligand concentration / metal concentration having the highest complexation constant leads to the best separation rate (data accessible by routine tests); the ratio is in particular between 0.5 and 2, more particularly between 0.8 and 1.7, preferably between 0.9 and 1.6, typical values being for example equal to or close to 1 or 1.5.
- these ligands form 1: 1 type complexes.
- any known method can be used to arrive at such a solution of metal salts.
- a treatment with nitric acid in an aqueous medium eg according to US-A-2,285,443 or GB-A-555,988.15, to give salts MO (N0 3 ) 2 .
- zirconium and hafnium are found essentially in the form of tetrachlorides. They are encountered for example in this form at the end of the carbochlorination of zircon.
- the mixture of tetrachlorides can be directly dissolved in an aqueous medium, eg water, at acid pH, which gives MOCI 2 salts (M for Zr or Hf).
- MOCI 2 salts M for Zr or Hf
- the mixture of tetrachlorides can be treated with nitric acid as indicated above.
- zirconium and hafnium meet in the form of oxide M0 2 . Again, you can use nitric acid treatment.
- the process according to the invention can replace the separation step, with or without pretreatment at the end carbochlorination.
- the aqueous medium to be treated is circulated in the vicinity of the filtration membrane and a pressure difference is applied between the two opposite faces of the membrane.
- the filtration membranes can be organic, mineral or organo-mineral. They advantageously comprise or advantageously consist of polymers such as polyaramides, sulfonated polysulfones, polybenzimidazolones, polyvinylidene fluorides grafted or not, polyamides, cellulose esters, cellulose ethers or perfluorinated ionomers, combinations of these polymers and the copolymers obtained from monomers of at least two of these polymers.
- polymers such as polyaramides, sulfonated polysulfones, polybenzimidazolones, polyvinylidene fluorides grafted or not, polyamides, cellulose esters, cellulose ethers or perfluorinated ionomers, combinations of these polymers and the copolymers obtained from monomers of at least two of these polymers.
- organomineral nanofiltration membranes comprising an active layer of a polymer of the polysulfone, polybenzenimidazolone, grafted polyvinylidene fluoride and perfluorinated ionomer type.
- membranes By way of examples of membranes, mention may be made of the membranes marketed by the company OSMONICS under the names of SEPA MG 17, SEPA MW-15 and SEPA BQ-01, which have a permeability to bidistilled water of between 2 and 10 Lh “1 .m “ 2 . bar “1 at 25 ° C.
- the tangential filtration technique is used, which has the advantage of limiting the phenomenon of accumulation of the species retained on the surface of the membrane and therefore of allowing continuous operation.
- filter modules are used in the form of tubes or cylinders or parallel plates or membranes wound around a perforated tube or cylinder intended to collect the permeate. These modules can be arranged in series and / or in parallel, possibly with different membranes in certain modules.
- the applied pressure difference and the circulation speed of the retentate and the temperature are adjustable parameters.
- the pressure difference can advantageously vary between 0.2 and 1.5 MPa, e.g. between 0.2 and 0.8 MPa.
- the ligand-metal complexes can be treated using appropriate decomplexing agent (s), so as to collect, on the one hand, the ligands (which are recyclable) and, on the other hand, metal.
- decomplexing agent s
- a given metal eg zirconium
- EDTA case of zirconium with EDTA
- permeate in the form of a complex with the ligand
- the metal in the retentate can be recovered for example - by basification, e.g. at pH T0, or by evaporation.
- the complexed metal can, after filtration, be released or decomplexed, for example in a basic medium and by precipitation of its hydroxide or by passage over a specific ion exchange resin.
- a specific ion exchange resin As part of this step, it is advantageous to provide in accordance with the invention an elimination of the solvent - in this case water - for example by evaporation, to allow the recovery of the metal.
- the equipment required for implementing the method according to the invention is relatively limited since it suffices for a complexation reactor, a pump and at least one filtration membrane, e.g. nanofiltration.
- the equipment is also readily available commercially.
- the basic installation may include a complexation reactor, a pump and a filtration module, eg nanofiltration, eg tangential, designed so that the retentate, after it has passed in the vicinity of the membrane, is recycled upstream of the filtration module, preferably in the complexing reactor.
- the reactor can be fed continuously or semi-continuously with the ligand and the mixture of metals.
- the (nano) filtration can advantageously comprise several stages, in series and / or in parallel, so as to increase the degree of separation or enrichment, permeate and / or retentate being subjected to the number of stages of treatment and (nano ) filtration required by the objective to be achieved.
- FIG. 1 is a curve of the retention rate in% as a function of the concentration of EDTA ligand, corresponding to Example 2;
- FIG. 2 is a curve of the retention rate in% as a function of the concentration of EDTA ligand, corresponding to example 3.
- the retention of zirconium in the form of zirconyl dinitrate is studied by treating an aqueous solution containing 0.259 mmol / L of ZrO (N0 3 ) 2 .
- the membrane has a permeability to bidistilled water of 3.6 Lh "1 .m " 2 .bar "1 at 25 ° C.
- an aqueous solution containing 0.1 mmol / L of zirconium and 0.1 mmol / L of hafnium is treated in the form of zirconyl dinitrate and hafnyl dinitrate.
- the membrane has a permeability to bidistilled water of 3.6 Lh "1 .m " 2 .bar '1 at 25 ° C.
- a complexing agent consisting of EDTA is added to the aqueous solution to be treated (Complexing constants: KZ ⁇ -E D TA ⁇
- the Hf / Zr separation is carried out under the following conditions:
- FIG. 1 show that the retention rate of zirconium is higher than that of hafnium when the solution contains from 0 to 2 equivalents of EDTA units per zirconium atom.
- the difference between the retention rate of zirconium and that of hafnium is maximum when the [complexing] / [zirconium] ratio is equal to 1. This difference is then equal to 30%.
- EXAMPLE 3 In this example, an aqueous solution containing 2 mmol / L of zirconium and 2 mmol / L of hafnium is treated in the form of zirconyl dinitrate and hafnyl dinitrate.
- the membrane has a permeability to bidistilled water of 3.6 Lh " 1 .m " 2 .bar '1 at 25 ° C.
- a complexing agent consisting of EDTA is added to the aqueous solution to be treated.
- the Hf / Zr separation is carried out under the following conditions:
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
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- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
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- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Inorganic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002525040A JP5060013B2 (ja) | 2000-09-11 | 2001-09-10 | ジルコニウムやハフニウムのような金属の分離方法 |
AU2001289999A AU2001289999A1 (en) | 2000-09-11 | 2001-09-10 | Method for separating metals such as zirconium and hafnium |
US10/380,261 US7063792B2 (en) | 2000-09-11 | 2001-09-10 | Method for separating metals such as zirconium and hafnium |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR00/11538 | 2000-09-11 | ||
FR0011538A FR2813877B1 (fr) | 2000-09-11 | 2000-09-11 | Procede de separation de metaux tels que le zirconium et l'hafnium |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002020408A1 true WO2002020408A1 (fr) | 2002-03-14 |
Family
ID=8854155
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2001/002806 WO2002020408A1 (fr) | 2000-09-11 | 2001-09-10 | Procede de separation de metaux tels que le zirconium et l'hafnium |
Country Status (7)
Country | Link |
---|---|
US (1) | US7063792B2 (fr) |
JP (1) | JP5060013B2 (fr) |
AU (1) | AU2001289999A1 (fr) |
FR (1) | FR2813877B1 (fr) |
RU (1) | RU2288892C2 (fr) |
WO (1) | WO2002020408A1 (fr) |
ZA (1) | ZA200301974B (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103601648A (zh) * | 2013-11-19 | 2014-02-26 | 宜兴市丰泽化工有限公司 | 一种dtpa五钠盐的脱盐提纯方法 |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2872811B1 (fr) * | 2004-07-09 | 2006-10-06 | Cie Europ Du Zirconium Cezus S | Procede de separation et purification du hafnium et du zirconium |
US8460905B2 (en) * | 2007-09-11 | 2013-06-11 | Bunge Oils, Inc. | Enzymatic degumming utilizing a mixture of PLA and PLC phospholipases with reduced reaction time |
US8956853B2 (en) * | 2007-01-30 | 2015-02-17 | Bunge Oils, Inc. | Enzymatic degumming utilizing a mixture of PLA and PLC phospholipases |
US8241876B2 (en) | 2008-01-07 | 2012-08-14 | Bunge Oils, Inc. | Generation of triacylglycerols from gums |
FR2963339B1 (fr) | 2010-08-02 | 2012-09-14 | Centre Nat Rech Scient | Procede de separation des tetrachlorures de zirconium et d'hafnium de leurs melanges |
KR101316335B1 (ko) | 2012-01-26 | 2013-10-18 | (주)포스코엠텍 | 지르코늄과 하프늄 분리를 위한 용매추출 방법 |
CN103998634B (zh) | 2012-05-29 | 2017-03-08 | 株式会社东芝 | 钨合金部件、以及使用该钨合金部件的放电灯、发射管和磁控管 |
CN103725901B (zh) * | 2013-12-12 | 2015-10-28 | 上海哈峰新材料科技有限公司 | 氧化锆/氧化铪混合物的火法分离方法 |
JP6194867B2 (ja) * | 2014-09-10 | 2017-09-13 | 信越化学工業株式会社 | 抽出分離方法 |
RU2623978C1 (ru) * | 2016-02-17 | 2017-06-29 | Федеральное государственное бюджетное учреждение науки "Институт химии твердого тела Уральского Отделения Российской Академии наук" | Способ извлечения циркония из кислых водных растворов |
CN115710645B (zh) * | 2021-08-23 | 2024-05-14 | 厦门稀土材料研究所 | 一种在盐酸体系下萃取分离制备核级锆、核级铪的方法 |
Citations (8)
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US2285443A (en) | 1940-06-29 | 1942-06-09 | Titanium Alloy Mfg Co | Method of making zirconium nitrate |
GB555988A (en) | 1942-03-11 | 1943-09-15 | Titanium Alloy Mfg Co | Improvements relating to the production of zirconium nitrate |
FR2250707A1 (fr) | 1973-11-14 | 1975-06-06 | Ugine Aciers | |
US4021531A (en) | 1973-11-14 | 1977-05-03 | Ugine Aciers | Process for the separation of zirconium and hafnium tetrachlorides from mixtures thereof |
FR2600264A1 (fr) | 1986-06-20 | 1987-12-24 | Commissariat Energie Atomique | Element d'ultrafiltration, d'hyperfiltration ou de demineralisation son procede de fabrication et son utilisation pour le traitement d'effluents liquides radioactifs |
JPS63236711A (ja) * | 1987-03-26 | 1988-10-03 | Mitsubishi Metal Corp | 希土類元素とZrとの分離方法 |
WO1992006675A1 (fr) | 1990-10-18 | 1992-04-30 | Minnesota Mining And Manufacturing Company | Formulation d'aerosol contenant du beclomethasone 17,21 dipropionate |
FR2794032A1 (fr) * | 1999-05-27 | 2000-12-01 | Univ Claude Bernard Lyon | Procede pour separer en milieu aqueux des lanthanides et/ou des actinides par complexation-nanofiltration, et nouveaux complexants mis en oeuvre dans ce procede |
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DE3616981A1 (de) | 1986-05-21 | 1987-11-26 | Linde Ag | Druckwechseladsorptionsverfahren |
US5766478A (en) * | 1995-05-30 | 1998-06-16 | The Regents Of The University Of California, Office Of Technology Transfer | Water-soluble polymers for recovery of metal ions from aqueous streams |
US5961833A (en) * | 1997-06-09 | 1999-10-05 | Hw Process Technologies, Inc. | Method for separating and isolating gold from copper in a gold processing system |
JPH1192840A (ja) * | 1997-09-22 | 1999-04-06 | Daiichi Kigensokagaku Kogyo Co Ltd | ジルコニウムの精製方法 |
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-
2000
- 2000-09-11 FR FR0011538A patent/FR2813877B1/fr not_active Expired - Fee Related
-
2001
- 2001-09-10 RU RU2003110327/15A patent/RU2288892C2/ru active
- 2001-09-10 AU AU2001289999A patent/AU2001289999A1/en not_active Abandoned
- 2001-09-10 US US10/380,261 patent/US7063792B2/en not_active Expired - Lifetime
- 2001-09-10 WO PCT/FR2001/002806 patent/WO2002020408A1/fr active Application Filing
- 2001-09-10 JP JP2002525040A patent/JP5060013B2/ja not_active Expired - Fee Related
-
2003
- 2003-03-11 ZA ZA200301974A patent/ZA200301974B/en unknown
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US2285443A (en) | 1940-06-29 | 1942-06-09 | Titanium Alloy Mfg Co | Method of making zirconium nitrate |
GB555988A (en) | 1942-03-11 | 1943-09-15 | Titanium Alloy Mfg Co | Improvements relating to the production of zirconium nitrate |
FR2250707A1 (fr) | 1973-11-14 | 1975-06-06 | Ugine Aciers | |
US4021531A (en) | 1973-11-14 | 1977-05-03 | Ugine Aciers | Process for the separation of zirconium and hafnium tetrachlorides from mixtures thereof |
FR2600264A1 (fr) | 1986-06-20 | 1987-12-24 | Commissariat Energie Atomique | Element d'ultrafiltration, d'hyperfiltration ou de demineralisation son procede de fabrication et son utilisation pour le traitement d'effluents liquides radioactifs |
JPS63236711A (ja) * | 1987-03-26 | 1988-10-03 | Mitsubishi Metal Corp | 希土類元素とZrとの分離方法 |
WO1992006675A1 (fr) | 1990-10-18 | 1992-04-30 | Minnesota Mining And Manufacturing Company | Formulation d'aerosol contenant du beclomethasone 17,21 dipropionate |
FR2794032A1 (fr) * | 1999-05-27 | 2000-12-01 | Univ Claude Bernard Lyon | Procede pour separer en milieu aqueux des lanthanides et/ou des actinides par complexation-nanofiltration, et nouveaux complexants mis en oeuvre dans ce procede |
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DATABASE CHEMABS [online] CHEMICAL ABSTRACTS SERVICE, COLUMBUS, OHIO, US; CHITRY, F. ET AL: "Separation of gadolinium(III) and lanthanum(III) by nanofiltration- complexation in aqueous medium", XP002168087, retrieved from STN Database accession no. 131:220264 * |
F. CHIRTY ET AL., J. RADIOANALYTICAL AND NUCLEAR CHEMISTRY, vol. 240, no. 2, 1999, pages 931 - 934 |
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PATENT ABSTRACTS OF JAPAN vol. 013, no. 039 (C - 563) 27 January 1989 (1989-01-27) * |
ROY P. HOUGHTON AT WIILIAMS EMYR; JCPRB4, J. CHEM. SOC. PERKIN TRANS. 1 EN, vol. 11, 1982, pages 2693 - 2696 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103601648A (zh) * | 2013-11-19 | 2014-02-26 | 宜兴市丰泽化工有限公司 | 一种dtpa五钠盐的脱盐提纯方法 |
CN103601648B (zh) * | 2013-11-19 | 2015-03-25 | 宜兴市丰泽化工有限公司 | 一种dtpa五钠盐的脱盐提纯方法 |
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US7063792B2 (en) | 2006-06-20 |
RU2288892C2 (ru) | 2006-12-10 |
JP2004508462A (ja) | 2004-03-18 |
US20040011739A1 (en) | 2004-01-22 |
JP5060013B2 (ja) | 2012-10-31 |
FR2813877B1 (fr) | 2002-12-06 |
FR2813877A1 (fr) | 2002-03-15 |
ZA200301974B (en) | 2004-03-11 |
AU2001289999A1 (en) | 2002-03-22 |
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