WO2013012081A1 - 水中のセシウムイオンの除去方法及び除去装置 - Google Patents
水中のセシウムイオンの除去方法及び除去装置 Download PDFInfo
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- WO2013012081A1 WO2013012081A1 PCT/JP2012/068514 JP2012068514W WO2013012081A1 WO 2013012081 A1 WO2013012081 A1 WO 2013012081A1 JP 2012068514 W JP2012068514 W JP 2012068514W WO 2013012081 A1 WO2013012081 A1 WO 2013012081A1
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- cesium
- aqueous solution
- magnetic particles
- cesium ions
- water
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/005—Pretreatment specially adapted for magnetic separation
- B03C1/01—Pretreatment specially adapted for magnetic separation by addition of magnetic adjuvants
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C2201/00—Details of magnetic or electrostatic separation
- B03C2201/18—Magnetic separation whereby the particles are suspended in a liquid
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
- C02F1/488—Treatment of water, waste water, or sewage with magnetic or electric fields for separation of magnetic materials, e.g. magnetic flocculation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
- C02F2001/425—Treatment of water, waste water, or sewage by ion-exchange using cation exchangers
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/006—Radioactive compounds
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/44—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of magnetic liquids, e.g. ferrofluids
Definitions
- the present invention relates to a method for removing cesium ions in an aqueous solution, and more particularly to a method for removing cesium ions from water contaminated with a large amount of radioactive cesium generated by a nuclear accident or the like and an apparatus used therefor.
- Methods for removing cesium ions from primary cooling water and soil decontamination water contaminated with radioactive cesium such as 137 Cs and 134 Cs include zeolites such as mordenite, heteropoly acid salts such as ammonium phosphomolybdate, There are methods in which cesium ions are adsorbed on a carrier such as an inorganic ion exchanger such as acidic salts of polyvalent metals such as titanium phosphate and insoluble ferrocyanides (Patent Documents 1 and 2 and Non-Patent Document 1).
- Insoluble ferrocyanides are directly administered to water contaminated with radioactive cesium to adsorb cesium ions, and a precipitate is formed using a polymer flocculant. The precipitate is centrifuged, and further decompressed. There is a method of removing radioactive cesium in a short time through filtration and drying processes (Non-patent Document 2).
- the method of directly adding insoluble ferrocyanide can be processed in a shorter time than the conventional method using a carrier, but still takes time, and the process including vacuum filtration is difficult to automate.
- there are many steps for treating the precipitate enriched with radioactive cesium in high concentration by human work and there is a big problem of increasing the chance of exposure during the treatment work.
- wastewater treatment systems using magnetic particles have been developed, and magnetic separation is used to remove heavy metals in aqueous solutions. Therefore, if this method is used for separation of cesium ions in an aqueous solution, it is possible to remove cesium ions by magnetic separation without the steps of centrifugation and vacuum filtration.
- Non-patent Document 3 A method of separating a solid adsorbent adsorbed with cesium ions is known (Non-patent Document 3).
- the method of separating the solid adsorbent and water by magnetic separation enables separation in a short time and processing with a relatively small facility.
- this method it is necessary to produce magnetic particles bonded with ferric ferrocyanide in advance, and this method also uses water-insoluble magnetic particles as a solid adsorbent. It takes time, and practical application is difficult.
- an object of the present invention is to provide a method and apparatus for efficiently separating and recovering cesium ions by reducing cesium ions in an aqueous solution in a short period of time and reducing human work steps as much as possible. is there.
- the present inventors have found a method for removing cesium ions in an aqueous solution in a uniform system in a short time. That is, the present invention is achieved by the following configuration.
- a method for removing cesium ions in an aqueous solution comprising preparing magnetic particles containing cesium ions in a cesium-containing aqueous solution and magnetically separating the magnetic particles.
- (2) A method for removing cesium ions in an aqueous solution comprising preparing magnetic particles containing cesium ions in a cesium-containing aqueous solution and filtering or magnetically separating the magnetic particles.
- a water-insoluble substance having a cesium ion adsorption capacity a support such as zeolite, an insoluble ferrocyanide, or a magnetic particle containing them
- a support such as zeolite, an insoluble ferrocyanide, or a magnetic particle containing them
- magnetic particles incorporating cesium ions in a homogeneous system are produced quickly and efficiently. Can be separated.
- cesium ions can be separated and recovered from the aqueous solution simply and efficiently.
- cesium ions in an aqueous solution can be removed easily and with excellent cesium removal efficiency in a short time of 60 minutes or less. Furthermore, according to the present invention, steps such as centrifugal separation and vacuum filtration that have been conventionally required are simplified by a general-purpose filtration or magnetic separation step, so that the cesium removal step can be automated. As a result, exposure to humans can be minimized, and it is extremely valuable as a radioactive cesium treatment technology. Also, the magnetic particles containing recovered cesium ions are much smaller in volume than cesium ion adsorption methods using water-insoluble adsorption carriers such as zeolite, greatly reducing the amount of radioactive waste. be able to.
- Non-Patent Document 3 the adsorption of radioactive cesium ions is attempted using magnetic fine particles on which ferric ferrocyanide is immobilized. Since the adsorption reaction is a heterogeneous system, a treatment time of 10 hours or more is required. I need it. Furthermore, according to the method of the present invention, it is not necessary to perform a preliminary operation such as producing an adsorbent by previously supporting iron ferrocyanide on a carrier, and the produced magnetic particles are hydrated by filtration or magnetic separation. Because it can be easily separated as low waste, it leads to reduction of waste.
- the method for removing cesium ions in an aqueous solution of the present invention is a method in which magnetic particles containing cesium ions are prepared in a cesium-containing aqueous solution, and the magnetic particles are filtered or magnetically separated.
- the present invention by producing magnetic particles in a cesium-containing aqueous solution, if magnetic particles containing cesium ions can be prepared by adsorbing or incorporating cesium ions in the magnetic particles in the production process of the magnetic particles, Any manufacturing method may be used.
- magnetic particles containing cesium ions can be prepared by producing magnetic particles in the presence of a compound having cesium ion adsorption ability in a cesium-containing aqueous solution.
- the cesium-containing aqueous solution is an aqueous solution in which cesium is dissolved in an ionic state.
- the cesium-containing aqueous solution may be subjected to pretreatment such as oil / water separation, filtration, and pH adjustment as necessary.
- the compound having cesium ion adsorption ability is preferably water-soluble, and a water-soluble ferrocyanide is preferably used.
- the water-soluble ferrocyanide is preferably a salt containing an alkali metal or a nitrogen compound, and examples thereof include sodium salts, potassium salts, ammonium salts, and potassium ferrocyanide and sodium ferrocyanide are particularly preferable.
- the addition amount of the water-soluble ferrocyanide to the cesium-containing aqueous solution is preferably a required amount equal to or more than the molar amount of the cesium ion in the aqueous solution.
- a method for producing magnetic particles in an aqueous solution is not particularly limited, and a known method can be used as appropriate.
- Magnetic particles prepared in an aqueous solution include magnetite, nickel oxide, ferrite, cobalt iron oxide, barium ferrite, Examples thereof include magnetic particles such as carbon steel, tungsten steel, KS steel, rare earth cobalt magnet, and hematite.
- magnetic particles containing cesium ions can be prepared in an aqueous solution by adding a water-soluble iron salt in the presence of the water-soluble ferrocyanide.
- water-soluble iron salt iron chloride, iron sulfate or iron nitrate can be used.
- water-soluble iron salt mixtures of divalent and trivalent water-soluble iron salts are preferable, and a mixture of ferrous chloride and ferric chloride is particularly preferable.
- an alkali to the aqueous solution in order to prepare magnetic particles efficiently.
- the time to add is not limited, it is preferably after the compound having the ability to adsorb cesium ions and the raw material compound for producing magnetic particles are added to water solubility.
- the alkali is not particularly limited as long as it assists the formation of magnetic particles. From the viewpoints of economy and handleability, there are sodium hydroxide, aqueous ammonia, urea, and the like, and the pH for preparing magnetic particles is preferably 10 or more.
- the obtained magnetic particles can be precipitated and agglomerated and separated as they are, but the magnetic particles can be recovered quickly and efficiently by filtration or magnetic separation.
- the magnetic separation can be performed by a conventionally known method such as a permanent magnet, an electromagnet, a superconducting magnet, or a magnetic column, and can be automated without human work to minimize the human influence of radioactive materials. Preferred above.
- Filtration can be performed by a known method using a known filter such as industrial filter paper, membrane filter, hollow filter, cartridge filter, glass filter paper, filter plate, etc. Automation without work is preferable in order to minimize the human influence of radioactive materials.
- the pore diameter of the filter is not particularly limited, but is preferably 0.2 ⁇ m or more from the viewpoint of improving the filtration rate and preventing clogging.
- the upper limit is not particularly limited, but is preferably 1 ⁇ m or less from the viewpoint of preventing recovery leakage during filtration of the produced magnetic fine particles.
- a polymer flocculant may be added after the magnetic particles are prepared.
- the polymer flocculant is not particularly limited as long as it is a flocculant capable of aggregating the generated magnetic particles.
- a polyanionic polymer flocculant such as polyacrylic acid can be used.
- the concentration of cesium ions in the cesium-containing aqueous solution to which the method of the present invention can be applied is not particularly limited, but can be widely applied to cesium-containing aqueous solutions having a cesium ion concentration of 1000 ppm to 1 ppm.
- the cesium ion concentration (ppm) indicates a weight concentration ((weight of cesium ion) / (volume of aqueous solution)).
- the particle size is not particularly limited as long as the magnetic particles can be filtered or magnetically separated, but it is preferably adjusted to 1 to 400 ⁇ m.
- the temperature and treatment time of the preparation step of magnetic particles containing cesium ions and the filtration or magnetic separation step in the method of the present invention are not particularly limited, but the temperature can be 20 to 100 ° C. . Particularly preferred is 50 ° C to 70 ° C.
- the magnetic particle preparation step is within 45 minutes by applying the method of the present invention, The time is preferably shortened to about 5 to 30 minutes as compared with the conventional method, and the cesium ion can be reduced within 60 minutes, preferably about 10 to 35 minutes, in combination with the filtration or magnetic separation step. Can be separated and removed.
- the operation within the above temperature range may be performed before adding ferrocyanide, metal salt, and alkali, ferrocyanide, It may be during the addition of the metal salt and the alkali, or after the addition of the ferrocyanide, the metal salt, and the alkali.
- the reaction solution containing the generated magnetic particles can be separated by a separation operation such as centrifugation, but can be quickly and efficiently separated and recovered by using filtration or magnetic separation.
- a separation operation such as centrifugation
- magnetic separation a known method and apparatus for separating magnetic particles from a reaction solution using magnetic force of a permanent magnet, an electromagnet, a superconducting magnet or the like can be used.
- the removal efficiency of cesium ions is 97 to 99.9%, and it is possible to achieve a cesium ion treatment efficiency superior to the conventional treatment efficiency.
- the recovered precipitate also varies depending on the concentration of cesium ions, but the amount of magnetic particles using water-soluble ferrocyanide and water-soluble iron salt is about plus alpha, and the precipitate obtained by the conventional removal method Compared with the volume of the product, the volume of the waste can be significantly reduced.
- the magnetic particles are automatically filtered into the tank.
- the treatment apparatus it is preferable to design the treatment apparatus so that the aqueous solution after collecting the magnetic particles is reused in the magnetic particle preparation step.
- the reaction liquid containing the generated magnetic particles is magnetically collected by a magnet installed outside the magnetic particle preparation tank, held in the preparation tank, the reaction liquid is discharged, the magnet is removed, and the magnetic particles are removed.
- a method of collecting a method of installing a magnet in a preparation tank, collecting magnetic particles on the surface, separating from the reaction solution, and scraping and collecting the collected magnetic particles from the surface of the magnet, in a magnetic field
- a method of collecting the magnetic particles by removing the magnetic field after collecting the magnetic particles in the magnetic column by passing the reaction solution through the magnetic column installed in the column can be exemplified.
- Example 1 1 ml of aqueous cesium chloride (concentration 20 mg / ml) and 20 ml of potassium ferrocyanide trihydrate aqueous solution (concentration 50 mg / ml) were added to a 100 ml three-necked flask, and the mixture was stirred at room temperature for 5 minutes at a rotational speed of 250 rpm. Furthermore, 40 ml of ferric chloride / hexahydrate aqueous solution (concentration 50 mg / ml) was added and stirred for 30 minutes. 15 ml of ferrous chloride / tetrahydrate aqueous solution (concentration: 50 mg / ml) was added and heated in a water bath while stirring was continued.
- Example 2 68 ml of 10 volume% seawater aqueous solution was put into a 100 ml three-necked flask, followed by addition of 1 ml of cesium chloride (concentration 20 mg / ml) and 2 ml of potassium ferrocyanide trihydrate aqueous solution (concentration 100 mg / ml) Stir at 250 rpm for 5 minutes. Further, 2.5 ml each of ferric chloride / hexahydrate aqueous solution (87 mg / ml) and ferrous chloride / tetrahydrate aqueous solution (32 mg / ml) were added to the flask, and the liquid temperature was 50 ° C. in a water bath. The temperature was raised until.
- Example 3 In Example 2, the addition amount of potassium ferrocyanide / trihydrate aqueous solution was 1 ml, ferric chloride / hexahydrate aqueous solution (87 mg / ml) and ferrous chloride / tetrahydrate aqueous solution (32 mg / ml).
- the cesium ion concentration before and after the reaction was measured in the same manner as in Example 2 except that the amount of addition was 1.5 ml each.
- the cesium ion concentration in the supernatant after the magnetic particle recovery decreased from the cesium ion concentration (200 ppm) before the reaction to 5 ppm or less, and 97% or more of the cesium ions were recovered on the magnetic particle side.
- the weight of the magnetic particles recovered at this time was 150 mg.
- the method and apparatus of the present invention can effectively remove and recover cesium ions in an aqueous solution, and is particularly suitable as a technique for removing cesium ions from water contaminated with radioactive cesium such as 137 Cs and 134 Cs. is there.
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Abstract
Description
しかしこれらの担体はセシウムイオンに対する選択性が低く、水溶液中の海水中の金属イオン、特にナトリウムイオンが共存すると、極端にセシウムイオンに対する吸着能が低下し、大量の吸着担体が必要となる。その結果、大量の放射性廃棄物を処理する必要となる。また水に不溶性の担体を使用しているため、セシウムイオンの吸着反応は不均一となり、吸着平衡に達するまでに時間を要する。
さらに近年、磁性粒子を用いた排水処理システムが開発され、水溶液中の重金属の除去に磁気分離が利用されている。したがって、この方法を水溶液中のセシウムイオンの分離に利用すれば、遠心分離、減圧濾過の工程がなく、磁気分離によりセシウムイオンを除去することが可能である。そのため、ヒトに対する被爆の少ない迅速なセシウムイオンの除去に向いていると想定される。
例えば、フェロシアン化鉄を結合させた磁性粒子からなる固体吸着剤をあらかじめ調整し、これを放射性セシウムに汚染された水に投入してセシウムイオンを吸着させ、磁場中に設置したカラムを用いて、セシウムイオンが吸着した固体吸着剤を分離する方法が知られている(非特許文献3)。磁気分離により固体吸着剤と水とを分離する方法は、短時間での分離、比較的小型の設備で処理が可能となる。しかしながら、この方法では、予めフェロシアン化鉄を結合した磁性粒子を製造する必要があり、また、この方法も水に不溶性の磁性粒子を固形吸着剤として使用しているため、吸着平衡に達するまでに時間を要し、実用化は困難である。
(1) セシウム含有水溶液中でセシウムイオンを含有する磁性粒子を調製し、該磁性粒子を磁気分離する、水溶液中のセシウムイオンの除去方法。
(2) セシウム含有水溶液中でセシウムイオンを含有する磁性粒子を調製し、該磁性粒子を濾過または磁気分離する、水溶液中のセシウムイオンの除去方法。
(3) セシウムイオンとセシウムイオン吸着物質を均一系で反応させた後にセシウムイオンを含有する磁性粒子を調製する、前記(1)または(2)記載のセシウムイオンの除去方法。
(4) 前記セシウム含有水溶液中に水溶性フェロシアン化物と水溶性鉄塩を添加してセシウムイオンを含有する磁性粒子を調製する、前記(1)または(2)記載のセシウムイオンの除去方法。
(5) 前記水溶性フェロシアン化物が、フェロシアン化カリウム又はフェロシアン化ナトリウムであり、前記水溶性鉄塩が、塩化鉄、硫酸鉄又は硝酸鉄である、前記(4)記載のセシウムイオンの除去方法。
(6) 前記水溶性鉄塩が、塩化鉄第一鉄と塩化第二鉄との混合物である、前記(5)記載のセシウムイオンの除去方法。
(7) 前記磁性粒子の調製後、前記セシウム含有水溶液中に凝集剤を添加して濾過または磁気分離を行う、前記(1)~(6)のいずれか1つに記載のセシウムイオンの除去方法。
(8) 前記セシウム含有水溶液中のセシウムイオンを、磁性微粒子調製工程と濾過または磁気分離工程とを併せて60分以内に除去する、前記(1)~(7)のいずれか1つに記載のセシウムイオンの除去方法。
(9) セシウムイオンを含有する磁性粒子を調製する槽を有し、かつ、該槽に該磁性粒子を自動的に濾過または磁気分離を行うための機能が配備された、前記(1)~(8)のいずれか1つに記載のセシウム含有水溶液中のセシウムイオンの除去を行うための除去装置。
更に本発明によれば、従来必要であった遠心分離、減圧濾過等の工程が、汎用の濾過または磁気分離工程で簡略化されるため、セシウム除去工程の自動化が可能である。その結果、ヒトに対する被爆は最低限度に止めることが可能であり、放射性セシウムの処理技術として、極めて価値の大きいものである。また回収されたセシウムイオンを含有する磁性粒子も、ゼオライトなどの水に不溶性の吸着担体によるセシウムイオンの吸着方法と比較して、その容積が非常に小さく、放射性廃棄物の量を大幅に低減することができる。
さらに非特許文献3によるとフェロシアン化鉄を固定化した磁性微粒子を用いて放射性セシウムイオンの吸着を試みているが、その吸着反応は不均一系であるために、10時間以上の処理時間を要している。
さらに、本発明の方法によれば、予めフェロシアン化鉄を担体に担持させて吸着剤を製造する等の予備操作を行う必要がなく、また、生成した磁性粒子は濾過または磁気分離により含水率の低い廃棄物として容易に分離できるため、廃棄物の低減につながる。
本発明では、セシウム含有水溶液中で磁性粒子を製造することによって、磁性粒子の製造過程において、磁性粒子中にセシウムイオンを吸着又は取り込んだ、セシウムイオンを含有する磁性粒子を調製することができれば、いかなる製造方法であってもよい。例えば、セシウム含有水溶液中でセシウムイオン吸着能を有する化合物の存在下で磁性粒子を製造することにより、セシウムイオンを含有する磁性粒子を調製することができる。セシウム含有水溶液は、セシウムがイオンの状態で溶解した水溶液である。なお、セシウム含有水溶液は必要に応じて、油水分離、濾過、pH調整等の前処理を行ってもよい。
例えば、セシウム含有水溶液において、上記水溶性フェロシアン化物の存在下で、水溶性鉄塩を添加することにより、水溶液中でセシウムイオンを含有する磁性粒子を調製することができる。かかる磁性粒子の調製過程において、セシウムイオンと反応しつつフェロシアン化物と水溶性鉄塩が反応して、セシウムイオンを含有する磁性粒子が得られるものと推定され、かつ、かかる調製工程を経ることにより、セシウムイオンが非常に効率よく、かつ短時間で磁性粒子に吸着ないし取り込まれることが判明した。
濾過は、工業用濾紙、メンブランフィルタ、中空フィルタ、カートリッジフィルタ、ガラス濾紙、濾過板などの公知のフィルタを用いて、従来公知の方法により行うことができ、磁気分離の場合と同様に、人的作業を経ることなく自動化することが、放射性物質の人的影響を最小限に抑える上で好ましい。フィルタの孔径は特に限定的ではないが、濾過速度の向上、目詰まり防止の点で、0.2μm以上であることが好ましい。上限は特に限定的でないが、生成した磁性微粒子の濾過時の回収漏れを防ぐ点で、1μm以下であることが好ましい。
磁性粒子の濾過または磁気分離が可能であれば粒径も特に限定的ではないが、1~400μmに調製することが好ましい。
なお、原子吸光光度法によるセシウムイオンの濃度の測定は、株式会社日立ハイテクノロジーズ製フレーム原子吸光光度計「Z-2300」を用いて、測定波長852.1nmで測定した。
また、本発明で使用した水は、ミリポア社製純水製造装置「Elix UV 35」によって精製された導電率14.7MΩcmの精製水である。
100mlの三口フラスコに塩化セシウム水溶液(濃度20mg/ml)を1mlとフェロシアン化カリウム・三水和物水溶液(濃度50mg/ml)を20ml添加し、室温で回転数250rpmにて5分間攪拌した。さらに塩化第二鉄・六水和物水溶液(濃度50mg/ml)を40ml添加し、30分攪拌した。塩化第一鉄・四水和物水溶液(濃度50mg/ml)15mlを添加し、攪拌を継続しながらウォーターバス中で加温した。液温が60℃に到達後、28重量%アンモニア水溶液を3ml添加し、60℃で10分攪拌を継続した。その後、攪拌を停止し、生成した磁性粒子を4000Gのネオジウム磁石にて回収した。磁性粒子回収後の上清を採取し、原子吸光光度法にて反応前後のセシウムイオン濃度を測定した。その結果、反応前のセシウムイオン濃度(200ppm)から磁性粒子回収後の上清のセシウムイオン濃度が5ppm以下に低下し、97%以上のセシウムイオンが磁性粒子側に回収されていた。
100mlの三口フラスコに10容量%海水水溶液を68ml入れ、続いて塩化セシウム(濃度20mg/ml)を1mlとフェロシアン化カリウム・三水和物水溶液(濃度100mg/ml)を2ml添加し、室温で回転数250rpmにて5分間攪拌した。さらに塩化第二鉄・六水和物水溶液(87mg/ml)と塩化第一鉄・四水和物水溶液(32mg/ml)各2.5mlをフラスコに添加し、ウォーターバスで液温が50℃になるまで昇温した。50℃到達後、28重量%アンモニア水溶液を2ml添加し、50℃で10分間、攪拌を継続した。その後、攪拌を停止し、生成した磁性粒子を4000Gのネオジウム磁石にて回収した。磁性粒子回収後の上清を採取し、原子吸光光度法にて反応前後のセシウムイオン濃度を測定した。その結果、反応前のセシウムイオン濃度(200ppm)から磁性粒子回収後の上清セシウムイオン濃度が5ppm以下に低下し、97%以上のセシウムイオンが磁性粒子側に回収されていた。
実施例2において、フェロシアン化カリウム・三水和物水溶液の添加量を1ml、塩化第二鉄・六水和物水溶液(87mg/ml)と塩化第一鉄・四水和物水溶液(32mg/ml)の添加量を各1.5mlとした以外は実施例2と同様にして、反応前後のセシウムイオン濃度を測定した。その結果、反応前のセシウムイオン濃度(200ppm)から磁性粒子回収後の上清のセシウムイオン濃度が5ppm以下に低下し、97%以上のセシウムイオンが磁性粒子側に回収されていた。また、このときに回収された磁性粒子の重量は150mgであった。
粉砕した天然硬質ゼオライト(NEW STONE社NS-IZK-ZEOLITE)390mgを50mlのサンプルチューブに入れ、さらに塩化セシウム(濃度20mg/ml)10mlを海水78ml、水692mlに添加して調製したセシウム含有10容量%海水水溶液39mlをサンプルチューブに入れ、5分、30分、1時間、4時間、24時間ロータリーシェーカーで攪拌した後、遠心分離(10000rpm、2分)にてゼオライトを分離した。その後、上清を採取し、原子吸光光度法にて反応前後のセシウムイオン濃度を測定した。その結果、5分後で70%、30分後で84%、1時間で88%、4時間で89%、24時間で95%のセシウムが回収されており、24時間吸着操作を継続しても5%のセシウムが残存することが確認された。
Claims (9)
- セシウム含有水溶液中でセシウムイオンを含有する磁性粒子を調製し、該磁性粒子を磁気分離する、水溶液中のセシウムイオンの除去方法。
- セシウム含有水溶液中でセシウムイオンを含有する磁性粒子を調製し、該磁性粒子を濾過または磁気分離する、水溶液中のセシウムイオンの除去方法。
- セシウムイオンとセシウムイオン吸着物質を均一系で反応させた後にセシウムイオンを含有する磁性粒子を調製する、請求項1または2記載のセシウムイオンの除去方法。
- 前記セシウム含有水溶液中に水溶性フェロシアン化物と水溶性鉄塩を添加してセシウムイオンを含有する磁性粒子を調製する、請求項1または2記載のセシウムイオンの除去方法。
- 前記水溶性フェロシアン化物が、フェロシアン化カリウム又はフェロシアン化ナトリウムであり、前記水溶性鉄塩が、塩化鉄、硫酸鉄又は硝酸鉄である、請求項4記載のセシウムイオンの除去方法。
- 前記水溶性鉄塩が、塩化鉄第一鉄と塩化第二鉄との混合物である、請求項5記載のセシウムイオンの除去方法。
- 前記磁性粒子の調製後、前記セシウム含有水溶液中に凝集剤を添加して濾過または磁気分離を行う、請求項1~6のいずれか1項に記載のセシウムイオンの除去方法。
- 前記セシウム含有水溶液中のセシウムイオンを、磁性微粒子調製工程と濾過または磁気分離工程とを併せて60分以内に除去する、請求項1~6のいずれか1項に記載のセシウムイオンの除去方法。
- セシウムイオンを含有する磁性粒子を調製する槽を有し、かつ、該槽に該磁性粒子を自動的に濾過または磁気分離を行うための機能が配備された、請求項1~8のいずれか1項に記載のセシウム含有水溶液中のセシウムイオンの除去を行うための除去装置。
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US14/233,885 US9659678B2 (en) | 2011-07-21 | 2012-07-20 | Method for removing cesium ions from water |
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JP5322335B1 (ja) * | 2013-06-12 | 2013-10-23 | 株式会社マイクロ・エナジー | 放射能汚染水の浄化処理方法 |
JP2014064991A (ja) * | 2012-09-26 | 2014-04-17 | Sumitomo Osaka Cement Co Ltd | セシウムを含む廃液の処理方法 |
JP5497226B1 (ja) * | 2013-05-07 | 2014-05-21 | 住友大阪セメント株式会社 | セシウムを含む脱塩ダストの処理方法及び処理装置 |
JP2015021802A (ja) * | 2013-07-18 | 2015-02-02 | 國分農場有限会社 | 放射性セシウムの処理方法 |
JP7390652B2 (ja) | 2019-02-08 | 2023-12-04 | 広島県公立大学法人 | 被処理物の調製方法並びに粉粒体の処理方法及び装置 |
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CN104054136B (zh) * | 2011-12-21 | 2016-05-11 | 捷恩智株式会社 | 使用磁性粒子的水溶液中的铯离子的除去方法 |
KR102160108B1 (ko) * | 2017-12-28 | 2020-09-25 | 한국원자력연구원 | 방사성 세슘 흡착제 및 이를 이용한 방사성 세슘의 제거방법 |
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JP7390652B2 (ja) | 2019-02-08 | 2023-12-04 | 広島県公立大学法人 | 被処理物の調製方法並びに粉粒体の処理方法及び装置 |
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US20140231353A1 (en) | 2014-08-21 |
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