CN111500861B - Method for extracting technetium from neutral molybdenum solution by using activated carbon fiber - Google Patents

Method for extracting technetium from neutral molybdenum solution by using activated carbon fiber Download PDF

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CN111500861B
CN111500861B CN202010261503.XA CN202010261503A CN111500861B CN 111500861 B CN111500861 B CN 111500861B CN 202010261503 A CN202010261503 A CN 202010261503A CN 111500861 B CN111500861 B CN 111500861B
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technetium
activated carbon
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molybdenum
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宋志浩
张蕴瀚
王宁
邓雪松
赵海龙
高翔
郭宏利
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Atom High Tech Co ltd
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B3/00Extraction of metal compounds from ores or concentrates by wet processes
    • C22B3/20Treatment or purification of solutions, e.g. obtained by leaching
    • C22B3/22Treatment or purification of solutions, e.g. obtained by leaching by physical processes, e.g. by filtration, by magnetic means, or by thermal decomposition
    • C22B3/24Treatment 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
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B61/00Obtaining metals not elsewhere provided for in this subclass
    • YGENERAL 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
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Abstract

The invention discloses a method for makingA method for extracting technetium from a neutral molybdenum solution using activated carbon fibers, said method comprising the steps of: (1) before molybdenum-technetium solution adsorption, washing the activated carbon fiber with water until effluent liquid is neutral; (2) preparing a neutral mixed solution containing molybdenum and technetium, wherein the mixed solution contains a high-concentration neutral salt compound; (3) adsorbing technetium in the molybdenum-technetium mixed solution obtained in the step (2) by using activated carbon fibers; (4) washing the molybdenum of the activated carbon fiber adhesive tape by using a washing solution; (5) the technetium adsorbed by the activated carbon fiber is desorbed by using a low-concentration leacheate or a leacheate without a neutral salt compound. The method has the following advantages: the solid phase separation material has good radiation resistance and low price and is easy to obtain; the obtained final solution containing technetium is neutral solution, and the preparation method is used for preparing the solution containing technetium99mTc]The subsequent process of the radiopharmaceutical does not require adjustment of the acidity of the solution.

Description

Method for extracting technetium from neutral molybdenum solution by using activated carbon fiber
Technical Field
The invention belongs to the field of radionuclide separation, and particularly relates to a method for extracting technetium from a neutral molybdenum solution by using activated carbon fibers.
Background
99Mo-99mTc generators were originally invented by Walter Tucker and Margret Greens in 1958 in an isotope project at the Brookhaven national laboratory. 80-85% of nuclear drugs used in medical imaging diagnosis in the world are used at present99mTc. The radioactive isotope is mainly from99mMother nuclide in Tc generator99Beta-decay of Mo.99Mo decays to99mThe efficiency of Tc is about 88.6%, the remaining 11.4% decays directly to99Tc。
99Mo-99mIn Tc Generator eluate99mThe concentration of Tc largely determines the image quality in Single Photon Emission Computed Tomography (SPECT) diagnostics and, therefore, in99Mo-99mIn the development of the Tc generator, it is known,99mthe concentration of Tc in the eluate was always the most dependentThe focus of attention.
Due to different production methods99mFor use in Tc generators99The specific activity of Mo is different.
High specific activity at present99Mo (100-50000 Ci/g Mo) is obtained by uranium fission production. Fission in commercial use today99Mo-99mThe main component of the Tc generator is an acidic alumina column, using MoO4 2-The affinity with acid alumina is far greater than that of TcO4 -And (4) designing the characteristics of the light source. The generator can obtain the high technetium which meets the requirements of pharmacopoeia99mTc]Sodium acid injection. High specific activity in the world99Mo is mainly provided by reactors in the Netherlands, Belgium, France, south Africa, Australia and Russia, and is fissile when events such as reactor shutdown overhaul or decommissioning occur in major production countries99Mo supply may face a shortage.
Non-fission process production99Mo is usually represented by98Mo and100mo is used as a raw material and is obtained by irradiation or accelerator preparation by using a reactor. Prepared by non-fission processes99The Mo activity is low (1-10 Ci/g Mo), and the non-radioactive Mo accounts for the overwhelming advantage. Loading Mo with low specific activity into normal fission99Mo-99mTc generator structure, obtained99mTc in the eluate99mThe Tc concentration is low and cannot meet the requirements of pharmacopoeia. Therefore, it is necessary to develop a low specific activity99Enrichment in Mo feed liquid99mTc.
Removing device99Beta of Mo-Decay to obtain99mTc, already realized by accelerators100Mo(p,2n)99mTc nuclear reaction preparation99mTc technique. Specific activity to99Extracting from Mo material liquid99mTc faces similar problems, accelerator preparation99mTc also requires extraction from feed solutions containing large amounts of nonradioactive Mo99mTc。
Therefore, how to get from low specific activity (< 10Ci/g Mo)99Separation and extraction of Mo99mTc is to solve fission99The key problem of Mo shortage.
Low specific activityDegree of rotation99mThe Tc extraction techniques can be divided into four categories: solvent extraction, sublimation, electrochemical, and column chromatography. The key of the column chromatography is to use a solid phase material containing Mo and99madsorption in Tc solution99mTc, and no or little adsorption of Mo, thereby achieving separation of molybdenum and technetium. The method has the characteristics of easy automation realization, stability and reliability, and thus becomes a research hotspot.
In the prior art, research is carried out on the separation of molybdenum and technetium by using Dowex-1X 8, ABEC resin and activated carbon materials as solid-phase adsorbing materials. Among them, the use of Dowex-1 × 8 anion exchange resin as a solid phase material for separating molybdenum and technetium requires rinsing with an organic solvent or perchloric acid to desorb technetium from the solid phase material, which is a risk for clinical use. In 2018, in 2 months, the U.S. Food and Drug Administration (FDA) approved a novel method for using ABEC resin as molybdenum-technetium separation material99Mo-99mTc generator RadioGenix. The RadioGenix system uses potassium hydroxide to dissolve Mo, performs washing of Mo with high concentration sodium hydroxide solution, and then performs washing of Tc using buffer solution or diluted sodium hydroxide solution. Although high technetium [ alpha ] can be obtained in a high concentration99mTc]Sodium acid solution, but the required solution types are more in the separation process, and the operation is more complicated. In US2012090431, activated carbon material is used as separation material for molybdenum and technetium, the separation process is similar to that of the system of ABEC resin, also using alkaline sodium hydroxide solution as initial solution, followed by washing of Mo with sodium hydroxide solution, and finally obtaining high concentration by hot dilute lye rinsing or electrochemical method99mTc solution. Also, the separation process requires more types of solutions and is complicated to operate.
In CN106995882A, in the process of99In Mo solution99mTc is extracted by preparing the initial solution into sodium hydroxide solution, followed by sodium hydroxide solution99And (4) leaching Mo. For99Mo-99mNeutralization of the leacheate is required to separate Tc99mTc is used for radiopharmaceuticals. The equipment manufactured based on the separation method has complex structure and is sprayedThe washing liquid post-treatment process is complicated.
Disclosure of Invention
In view of the problems in the background art, the present invention provides a method for extracting technetium from a neutral molybdenum solution using activated carbon fibers. The invention uses the pretreated activated carbon fiber as the solid phase separation material of molybdenum and technetium, and can adsorb technetium from the neutral mixed solution containing molybdenum and technetium, but does not adsorb or hardly adsorb molybdenum. The use of a neutral wash allows for the desorption of technetium, thereby effecting the separation of molybdenum and technetium.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for extracting technetium from a neutral molybdenum solution using activated carbon fibers, the method comprising the steps of:
(1) before molybdenum-technetium solution adsorption, washing activated carbon fibers with water until the acidity of effluent is neutral;
(2) preparing a neutral mixed solution containing molybdenum and technetium, wherein the mixed solution contains neutral salt compounds of which the mol/L is more than or equal to 1 mol/L;
(3) adsorbing technetium in the molybdenum-technetium mixed solution obtained in the step (2) by using activated carbon fibers;
(4) neutral salt compound solution with the concentration of more than or equal to 1mol/L is used as washing liquid to wash molybdenum of the activated carbon fiber adhesive tape;
(5) and desorbing technetium adsorbed by the activated carbon fiber by using a neutral salt compound solution of less than 1mol/L or sterile water for injection as leacheate.
As a preferable mode, in the step (1), the activated carbon fiber is any one or more of activated carbon fibers which are treated with alkali liquor, or treated with microwave heating after alkali liquor treatment, or not treated at all.
Preferably, in the step (1), the neutral pH is 5-8.
Preferably, in the step (2), the step (4) and the step (5), the pH of the neutral mixed solution is 5-8.
In a preferable embodiment, in the step (2), the neutral salt compound is a neutral salt compound containing sodium ions or potassium ions.
In a preferred embodiment, the neutral salt compound is selected from any one of sodium chloride, potassium chloride, sodium sulfate, potassium sulfate, sodium nitrate, and potassium nitrate. For further purification of pertechnetate, the neutral salt compound is preferably inorganic salt containing chloride ions, such as sodium chloride or potassium chloride.
In a preferable embodiment, in the step (4), the neutral salt compound is a neutral salt compound containing sodium ions or potassium ions.
In a preferred embodiment, the neutral salt compound is selected from any one of sodium chloride, potassium chloride, sodium sulfate, potassium sulfate, sodium nitrate, and potassium nitrate. For further purification of pertechnetate, the neutral salt compound is preferably inorganic salt containing chloride ions, such as sodium chloride or potassium chloride.
The leacheate can only use sodium chloride solution, so that the impurity content and the pollution chance are reduced.
In a preferable embodiment, in the step (5), the neutral salt compound is a neutral salt compound containing sodium ions or potassium ions.
In a preferred embodiment, the neutral salt compound is selected from any one of sodium chloride, potassium chloride, sodium sulfate, potassium sulfate, sodium nitrate, and potassium nitrate. For further purification of pertechnetate, the neutral salt compound is preferably inorganic salt containing chloride ions, such as sodium chloride or potassium chloride.
Compared with the prior art, the invention has the following beneficial effects:
the method has the characteristics that the radiation resistance of the solid phase separation material is good, the adsorption separation performance is stable, and the solid phase separation material is low in price and easy to obtain; the resulting final technetium-containing solution is a neutral solution and adjustment of the acidity of the solution is not necessary in the subsequent process of preparing the technetium-containing radiopharmaceutical.
The essential feature of the application is that the activated carbon fiber is treated, a material which adsorbs technetium in neutral solution but not molybdenum is selected, andit is applied to molybdenum-technetium separation. Based on this, the process is carried out99Mo-99mAt separation of Tc, contain99mTc eluates can be used for radiopharmaceuticals without neutralization (since injection solutions require neutrality and cannot be used directly if the eluates are basic). Thus, the processing process flow and the device structure can be simplified in practical application. Therefore, there is a certain advantage to extracting technetium directly from neutral molybdenum solutions, as compared to extracting technetium from alkaline molybdenum-containing solutions.
Detailed Description
The specific embodiment of the invention provides a method for extracting technetium from a neutral molybdenum solution by using activated carbon fibers, which comprises the following steps:
(1) before molybdenum-technetium solution adsorption, activated carbon fibers were rinsed with water until the effluent acidity was neutral.
The activated carbon fiber is a mixture of the activated carbon fiber, which is treated by alkali liquor, or subjected to microwave heating treatment after alkali liquor treatment, or not subjected to any treatment in any proportion. Through alkali liquor treatment and microwave treatment, the activated carbon fiber used in the invention has the following characteristics: in a static adsorption experiment, the activated carbon fiber can adsorb a certain amount of molybdate ions in a strong acid solution, and shows a repulsive action to the molybdate ions in a solution with the pH value of more than 5, so that the molybdate ions are not adsorbed. Because the surface of the activated carbon fiber has alkaline groups, in order to ensure the smooth separation operation, a certain amount of water is needed to wash the activated carbon fiber until the effluent liquid is neutral. The specific operation can be to prepare the activated carbon into a chromatographic column, inject neutral water into the chromatographic column by using a syringe or a peristaltic pump for washing, and detect the acidity of effluent by using a pH test paper until the effluent is neutral.
(2) A neutral mixed solution containing molybdenum and technetium is prepared, and the mixed solution contains a high-concentration neutral salt compound.
The molybdenum should be present as molybdate and the technetium as pertechnetate. The ionic strength of the mixed solution can affect the adsorption of pertechnetate ions by the activated carbon fibers. Experiments show that in the solution with high ionic strength, the activated carbon fiber has stronger adsorption capacity to pertechnetate, and pertechnetate ions can not be easily eluted; in the low ionic strength solution, the activated carbon fiber has weak adsorption capacity to pertechnetate, and pertechnetate ions can be easily eluted. For further purification of pertechnetate, the neutral salt compound is preferably inorganic salt containing chloride ions, such as sodium chloride or potassium chloride.
(3) And (3) adsorbing technetium in the mixed solution of molybdenum and technetium obtained in the step (2) by using activated carbon fibers.
This step can use a dynamic method to separate the mixed solution of molybdenum and technetium. The activated carbon fiber with certain mass is used to prepare a chromatographic column for dynamic adsorption separation of molybdenum and technetium. The mixed solution of molybdenum and technetium is pumped through the activated carbon chromatography column at a flow rate, for example, using a peristaltic pump or a syringe pump, such that technetium in the mixed solution of molybdenum and technetium is adsorbed on the activated carbon chromatography column, while molybdenum is not adsorbed or is minimally adsorbed on the chromatography column. A large number of99Mo flows out after passing through the color layer column99Decay daughter of Mo99mRepeating the procedure after Tc formation, and separating the molybdenum-technetium again to obtain99mTc。
(4) And washing the molybdenum adhered to the activated carbon fiber by using a washing solution.
The activated carbon fiber surface adsorbed with technetium will have some molybdenum adhered to it, which can be removed by a washing liquid while ensuring that the adsorbed technetium is not desorbed. For activated carbon fibers that adsorb technetium using dynamic adsorption, a certain volume of wash solution can be pumped through. The washing solution may have similar composition to that of the neutral mixed solution prepared in step (2).
(5) The technetium adsorbed by the activated carbon fiber is desorbed by using a low-concentration leacheate or a leacheate without a neutral salt compound.
The activated carbon fiber for adsorbing technetium by dynamic adsorption method can be desorbed by pumping a certain volume of leacheate to obtain technetium-containing solution.
To facilitate a further understanding of the invention, the following examples are provided to illustrate it in more detail. These embodiments are merely illustrative and not restrictive of the scope or principles of the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principles of the embodiments of the invention are intended to be included within the scope of the invention.
Example 1
0.5g of activated carbon fiber treated by alkali liquor is taken to prepare a chromatographic column. Injecting water for injection into the syringe to wash the prepared activated carbon fiber column until the pH of the effluent is 6. 10ml of solution with the sodium chloride concentration of 1mol/L and the sodium molybdate concentration of 1mol/L is prepared, and 10mCi is added into the solution99Mo-99mTc equilibrium mixed solution was used as tracer. The mixed solution containing molybdenum and technetium was pumped through the chromatographic column at a flow rate of 10mL/min to recover the molybdenum-containing effluent. At this time, technetium is adsorbed on the chromatographic column. 40mL of a 1mol/L sodium chloride solution was pumped through the column at a flow rate of 10mL/min, and a small amount of molybdenum adhered thereto was washed. Finally, the technetium on the column was eluted by pumping 10mL of sterile water for injection at a flow rate of 10 mL/min. The obtained eluate is the solution containing technetium, and the separation of molybdenum and technetium is completed.
Example 2
0.5g of activated carbon fiber subjected to alkali liquor treatment and microwave treatment is taken to prepare the chromatographic column. Injecting water for injection into the syringe to wash the prepared activated carbon fiber column until the pH of the effluent is 7. 10ml of solution with the potassium chloride concentration of 1.2mol/L and the sodium molybdate concentration of 1mol/L is prepared, and 10mCi is added into the solution99Mo-99mTc equilibrium mixed solution was used as tracer. The mixed solution containing molybdenum and technetium was pumped through the chromatographic column at a flow rate of 10mL/min to recover the molybdenum-containing effluent. At this time, technetium is adsorbed on the chromatographic column. 40mL of a 1mol/L sodium chloride solution was pumped through the column at a flow rate of 10mL/min, and a small amount of molybdenum adhered thereto was washed. Finally, the technetium on the column was eluted by pumping 5mL of sterile water for injection at a flow rate of 10 mL/min. The obtained eluate is the solution containing technetium, and the separation of molybdenum and technetium is completed.
Example 3
0.3g of activated carbon fiber treated by alkali liquor and 0.2g of untreated activated carbon fiber are taken to prepare the chromatographic column. Injecting water for injection into the syringe to wash the prepared activated carbon fiber column until the pH of the effluent is 7. The concentration of the prepared potassium chloride is 1.10ml of 1mol/L solution with sodium molybdate concentration of 1mol/L, and 9.5mCi is added into the solution99Mo-99mTc equilibrium mixed solution was used as tracer. The mixed solution containing molybdenum and technetium was pumped through the chromatographic column at a flow rate of 8mL/min to recover the molybdenum-containing effluent. At this time, technetium is adsorbed on the chromatographic column. 30mL of a 1mol/L potassium chloride solution was pumped through the column at a flow rate of 10mL/min, and a small amount of molybdenum adhered thereto was washed. Finally, the technetium on the column was eluted by pumping 5mL of 0.9% sodium chloride injection at a flow rate of 10 mL/min. The obtained eluate is the solution containing technetium, and the separation of molybdenum and technetium is completed.
Example 4
0.5g of untreated activated carbon fiber was taken to prepare a chromatographic column. Injecting water for injection into the syringe to wash the prepared activated carbon fiber column until the pH of the effluent is 5. 10ml of solution with the sodium sulfate concentration of 1mol/L and the sodium molybdate concentration of 1mol/L is prepared, and 10mCi is added into the solution99Mo-99mTc equilibrium mixed solution was used as tracer. The mixed solution containing molybdenum and technetium was pumped through the chromatographic column at a flow rate of 10mL/min to recover the molybdenum-containing effluent. At this time, technetium is adsorbed on the chromatographic column. 40mL of a 1mol/L sodium sulfate solution was pumped through the column at a flow rate of 10mL/min, and a small amount of molybdenum adhered thereto was washed. Finally, the technetium on the column was eluted by pumping 5mL of 0.02mol/L sodium sulfate injection at a flow rate of 10 mL/min. The obtained eluate is the solution containing technetium, and the separation of molybdenum and technetium is completed.
Example 5
0.5g of activated carbon fiber treated by alkali liquor is taken to prepare a chromatographic column. Injecting water for injection into the syringe to wash the prepared activated carbon fiber column until the pH of the effluent is 8. 10ml of a solution with a potassium nitrate concentration of 1.1mol/L and a sodium molybdate concentration of 1mol/L is prepared, and 10mCi is added into the solution99Mo-99mTc equilibrium mixed solution was used as tracer. The mixed solution containing molybdenum and technetium was pumped through the chromatographic column at a flow rate of 10mL/min to recover the molybdenum-containing effluent. At this time, technetium is adsorbed on the chromatographic column. 40mL of a 1.1mol/L potassium nitrate solution was pumped through the column at a flow rate of 10mL/min, and a small amount of molybdenum adhered thereto was washed. Finally, 5mL of 0.01mol/L potassium nitrate was pumped through the reactor at a flow rate of 10mL/minAnd eluting technetium on the column. The obtained eluate is the solution containing technetium, and the separation of molybdenum and technetium is completed.
TABLE 1 residue of molybdenum in leacheate obtained in different examples
Group of Mo residue in leacheate
Example 1 Not detected out
Example 2 1.0μg/mL
Example 3 1.3μg/mL
Example 4 3.3μg/ml
Example 5 Not detected out

Claims (8)

1. A method for extracting technetium from a neutral molybdenum solution using activated carbon fibers, the method comprising the steps of:
(1) before molybdenum-technetium solution adsorption, washing the activated carbon fiber with water until the acidity of effluent is neutral, wherein the activated carbon fiber is treated by alkali liquor, or subjected to microwave heating treatment after alkali liquor treatment, or any one or more of the activated carbon fibers which are not subjected to any treatment;
(2) preparing a neutral mixed solution containing molybdenum and technetium, wherein the mixed solution contains neutral salt compounds of which the mol/L is more than or equal to 1 mol/L;
(3) adsorbing technetium in the molybdenum-technetium mixed solution obtained in the step (2) by using activated carbon fibers;
(4) neutral salt compound solution with the concentration of more than or equal to 1mol/L is used as washing liquid to wash molybdenum of the activated carbon fiber adhesive tape;
(5) and desorbing technetium adsorbed by the activated carbon fiber by using a neutral salt compound solution of less than 1mol/L or sterile water for injection as leacheate.
2. The method for extracting technetium from a neutral molybdenum solution using activated carbon fiber according to claim 1, wherein the neutral pH is 5 to 8 in the step (1), the step (2), the step (4) and the step (5).
3. The method for extracting technetium from a neutral molybdenum solution using activated carbon fiber according to claim 1, wherein in the step (2), the neutral salt compound is a neutral salt compound containing sodium ions or potassium ions.
4. The method for extracting technetium from a neutral molybdenum solution using activated carbon fiber according to claim 3, wherein the neutral salt-type compound is any one selected from the group consisting of sodium chloride, potassium chloride, sodium sulfate, potassium sulfate, sodium nitrate and potassium nitrate.
5. The method for extracting technetium from a neutral molybdenum solution using activated carbon fiber according to claim 1, wherein in the step (4), the neutral salt compound is a neutral salt compound containing sodium ion or potassium ion.
6. The method for extracting technetium from a neutral molybdenum solution using activated carbon fiber according to claim 5, wherein the neutral salt-type compound is any one selected from the group consisting of sodium chloride, potassium chloride, sodium sulfate, potassium sulfate, sodium nitrate and potassium nitrate.
7. The method for extracting technetium from a neutral molybdenum solution using activated carbon fiber according to claim 1, wherein in the step (5), the neutral salt compound is a neutral salt compound containing sodium ion or potassium ion.
8. The method for extracting technetium from a neutral molybdenum solution using activated carbon fiber according to claim 7, wherein the neutral salt-type compound is any one selected from the group consisting of sodium chloride, potassium chloride, sodium sulfate, potassium sulfate, sodium nitrate and potassium nitrate.
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US4738834A (en) * 1984-02-24 1988-04-19 Australia Nuclear Science & Technology Organization Treatment of technetium containing solutions
US20120090431A1 (en) * 2009-06-19 2012-04-19 Kaken Co., Ltd. Method of recovering enriched radioactive technetium and system therefor
CN106967882A (en) * 2017-01-16 2017-07-21 原子高科股份有限公司 A kind of method that use polyamide extracts technetium from molybdenum solution
CN106995882A (en) * 2017-01-16 2017-08-01 原子高科股份有限公司 A kind of method that use absorbent charcoal material extracts technetium from molybdenum solution

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0254732A (en) * 1988-08-18 1990-02-23 Japan Atom Energy Res Inst Method for eluting technetium from activated carbon

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4738834A (en) * 1984-02-24 1988-04-19 Australia Nuclear Science & Technology Organization Treatment of technetium containing solutions
US20120090431A1 (en) * 2009-06-19 2012-04-19 Kaken Co., Ltd. Method of recovering enriched radioactive technetium and system therefor
CN106967882A (en) * 2017-01-16 2017-07-21 原子高科股份有限公司 A kind of method that use polyamide extracts technetium from molybdenum solution
CN106995882A (en) * 2017-01-16 2017-08-01 原子高科股份有限公司 A kind of method that use absorbent charcoal material extracts technetium from molybdenum solution

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