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21. 发明专利

JPS5614942A METHOD AND APPARATUS FOR DETERMINING AMOUNT OF URANIUM 失效
公开(公告)号：JPS5614942A
公开(公告)日：1981-02-13
申请号：JP9038779
申请日：1979-07-18
申请人： HITACHI LTD
发明人： MAEKOYA CHIAKI , TAKADA YOSHITADA , YAMASHITA HISAO , OZAWA YOSHIHIRO
IPC分类号： G01N30/02 , G01N27/00 , G01N27/49 , G01N30/26 , G01N30/64 , G01N30/88
摘要： PURPOSE:To determine an amount of uranium quickly and automatically by using an electrochemical uranium-amount detector, and a concentrating unit for a low- concentrated uranium sample, which is disposed shiftably with respect to a uranium sample supply unit. CONSTITUTION:An eluate is supplied by a liquid supply pump in an eluate supply section A so as to be sent to a separation section D through a concentration section B, which is communicated with an arbitrary passage by a control section F. A predetermined amount of sample is added to the eluate in a sample injection section C which is on the upstream side of the separation section D. Uranium is separated from the other components in the separation section D and sent to a detection section E. Only when uranium liquates out from the separation section D, an electric current corresponding to the concentration thereof flows, so that a chromatogram is drawn in a recording section G.

22. 发明专利

JPS5544548A COLLECTING METHOD FOR URANIUM IN SEA WATER 失效
公开(公告)号：JPS5544548A
公开(公告)日：1980-03-28
申请号：JP11745478
申请日：1978-09-26
申请人： HITACHI LTD
发明人： OZAWA YOSHIHIRO , YAMASHITA HISAO , MAEKOYA CHIAKI , FUJITA KAZUNORI
IPC分类号： C22B60/02 , B01D15/00 , B01J20/06 , B01J20/28 , C01G43/00
摘要： PURPOSE:To increase the amt. of uranium adsorbed on a magnetic adsorbent by magnetically binding the adsorbent in a magnetic fixed bed to reduce the press. loss of sea water passed when dissolved uranium is collected from the sea water. CONSTITUTION:Uranium adsorbing magnetic fixed bed 1 is divided into magnetic thin wire packed part 1a of large capacity and magnetic thin wire packed part 1b of small capacity, and parts 1a, 1b are provided with external magnetic field generating electromagnetic coils 1c, 1d. Sea water is passed through bed 1 with sea water pump 2. An uranium adsorbent such as ferrite or magnetite is bound by the thin wire packing such as steel wire or wire netting in bed 1 magnetized with coils 1c, 1d. After uranium is allowed to be well adsorbed on the adsorbent, the electric current being supplie to coil 1c is shut off, and the adsorbent in part 1a is shifted to part 1b. Gates 15, 16, 17 are closed, and an aq. soln. of ammonium carbonate is passed through bed 1 with pump 6 to elute the adsorbed uranium, which is then recovered. Since the adsorbent is magnetically bound in bed 1, it is not fall off and can be packed sparsely to reduce the press. loss of sea water.

23. 发明专利

JPS54137417A RECOVERY OF URANIUM IN SEA WATER BY COPRECIPITATION 失效
公开(公告)号：JPS54137417A
公开(公告)日：1979-10-25
申请号：JP4536678
申请日：1978-04-19
申请人： HITACHI LTD
发明人： YAMASHITA HISAO , OZAWA YOSHIHIRO , MAEKOYA CHIAKI , FUJITA KAZUNORI , NAKASHIMA FUMITO
IPC分类号： C22B60/02 , B01D21/00 , B01D21/01
摘要： PURPOSE:To recover uranium present in the sea water with good efficiency by the procedure in which the sea water is continuously introduced into a container, then a coprecipitator and a ferrous salt are added to the sea water from one end of the container to coprecipitate U in the sea water in the form of a precipitate with a magnetism, and lastly the precipitate is adsorped by a magnetic separator. CONSTITUTION:The sea water is introduced into the container 1 from the sea water intake 2 of the sea water storage container 1, when an U-coprecipitator is added to the sea water concurrently from the charging opening 4. The U-coprecipitator used is composed of the hydroxides of Ti, Al, and Fe(III) and, when using, is mixed with a ferrous salt, e.g., ferrous chloride, ferrous fulfate, etc., in a Ti/Fe(II) molal ratio = 0.4 to 6, in a Al/Fe(II) molal ratio = 0.3 to 6, and in a Fe(II/Fe(III) molal ratio = 0.4 to 8 in order give the copricipitate a magnetism. Because the copricipitate 6 contains U and also the Fe(II) becomes gamma-Fe2O3 or Fe3O4 with a magnetism, it is separated by the magnetic separator 5 provided at the outlet of the container 1 for recovery.

24. 发明专利

JPS54135686A RECOVERING METHOD FOR SEAWATER URANIUM COLLECTING ADSORBENT 失效
公开(公告)号：JPS54135686A
公开(公告)日：1979-10-22
申请号：JP4311378
申请日：1978-04-14
申请人： HITACHI LTD
发明人： MAEKOYA CHIAKI , OZAWA YOSHIHIRO , YAMASHITA HISAO , FUJITA KAZUNORI , NAKASHIMA FUMITO
IPC分类号： C22B60/02 , B01D15/00
摘要： PURPOSE:To efficiently recover an adsorbent which has adsorbed U in seawater, by removing part of the adsorbent in seawater which part is of a relatively large diameter by sedimentation separation; adding a ferrous salt soln. to the seawater to coprecipitate the residual fine adsorbent and an iron cpd.; and magnetically separating the adsorbent. CONSTITUTION:Adsorbent 2 and seawater 3 are contacted in adsorption vessel 1 for a fixed time and fed to settler 6 with pump 5 to remove part of adsorbent 2 which part is of a relatively large diameter. Seawater contg. fine adsorbent 2 is supplied to mixer 10 with pump 9. A ferrous salt soln. is fed from tank 12 to mixer 10 with pump 11 and mixed into the seawater. The mixed soln. is introduced into magnetic separtor 13 to separate the adsorbent and seawater. The seawater is discharged. Precipitates accumulated in the lower part of settler 6 are fed to a U adsorption process together with the adsorbent recovered by the magnetic separation. Since the adsorbent concn. after the sedimentation separation is below 1 ppm, below 1 ppm of the ferrous salt is enough to be added. The salt easily forms magnetic precipitates such as gamma-Fe2O3 and Fe3O4 in seawater to coprecipitate the fine adsorbent.

25. 发明专利

JPS54128994A URANIUM COLLECTING MAGNETIC ADSORBENT 失效
公开(公告)号：JPS54128994A
公开(公告)日：1979-10-05
申请号：JP3665078
申请日：1978-03-31
申请人： HITACHI LTD
发明人： OZAWA YOSHIHIRO , MAEKOYA CHIAKI , YAMASHITA HISAO , FUJITA KAZUNORI , TAKEUCHI SEIJI , NAKASHIMA FUMITO
IPC分类号： C22B60/02 , B01D15/00 , B01J20/08
摘要： PURPOSE:To provide a U collecting magnetic adsorbent consisting of a slightly sol. hydrated oxide of Al, Mn, Zn or the like and iron hydroxide which adsorbent efficiently recovers U from a U ion-contg. soln. and easily separates into solid and liquid. CONSTITUTION:An ap. soln. of a ferrous salt such as iron chloride or iron sulfate is mixed with an aq. soln. contg. a slightly sol. hydrated oxide-forming cpd. of Al, Mn, Zn, iron, rare earth elements or the like, e.g. AlCl3. To the mixed soln. is slowly added n alkali soln. such as an aq. soln. of NaOH or ammonia water, fomring precipitates of a binary complex such as iron-Al. The precipitates are then gradually oxidized in an oxidizing atmosphere such as air to be converted into Fe3O4, FeOOH or their mixt. As the precipitates-forming temp. is raised, formation of ferrimagnetic Fe3O4 is facilitated. By adding an alkali in an amt. just equivalent or slightly excess to the amt. of the ferrous salt, a suspension of pH 9 may be formed and mostly converted into Fe3O4 at an oxidation temp. above 50 deg.C. Thus, a magnetic adsorbent is obtd. having U adsorbing power and ferromagnetism.

26. 发明专利

JPS51140219A GAS JET VALVE 失效
公开(公告)号：JPS51140219A
公开(公告)日：1976-12-03
申请号：JP6433075
申请日：1975-05-30
申请人： HITACHI LTD
发明人： SATOU YOSHIHIKO , NAITOU KASAHIRO , FUKUSHIMA MINORU , MINATO AKIHIKO , OZAWA YOSHIHIRO
IPC分类号： B05B1/00 , F16K17/36 , F17C13/04 , F17C13/12 , G21C19/30
摘要： PURPOSE:The supply of cooled compressed gas to the container of coprecipitator without using any cooling materrials from outside.

27. 发明专利

JP2585327B2 失效
公开(公告)号：JP2585327B2
公开(公告)日：1997-02-26
申请号：JP31624087
申请日：1987-12-16
申请人： HITACHI LTD
发明人： OZAWA YOSHIHIRO , SAKAGAMI MASAHARU , KONDO MASAYOSHI
IPC分类号： B01D53/22 , B01D59/12 , C01B4/00 , G21B1/00 , G21B1/11

28. 发明专利

JPH0631852B2 失效
公开(公告)号：JPH0631852B2
公开(公告)日：1994-04-27
申请号：JP19102889
申请日：1989-07-24
申请人： HITACHI LTD
发明人： FUKAZAWA TETSUO , OOTSUKA MASAHARU , UETAKE NAOTO , OZAWA YOSHIHIRO
IPC分类号： G21F9/16 , G21F9/30 , G21F9/36

29. 发明专利

JPH0691163A METHOD FOR OXIDIZING OR REDUCING DISSOLVED MATERIAL 失效
公开(公告)号：JPH0691163A
公开(公告)日：1994-04-05
申请号：JP561193
申请日：1993-01-18
申请人： HITACHI LTD
发明人： NISHI TAKASHI , KITAMORI TAKEHIKO , FUKAZAWA TETSUO , FUJIMORI HARUO , SASAHIRA AKIRA , OZAWA YOSHIHIRO , SUZUKI KAZUMICHI , YUSA HIDEO , YOSHIDA TOMIO
IPC分类号： B01J19/12 , B01J23/40 , B01J35/02 , C02F1/30 , C02F1/70 , C02F1/72 , G21F9/06
摘要： PURPOSE:To drastically improve the efficiency of photo-oxidation or photoreduction by irradiating the granular semiconductor photocatalyst in the aq. nitric acid in which the material contained in the spent nuclear fuel is dis solved with a electromagnetic wave having an energy sufficient to excite the catalyst. CONSTITUTION:Aq. nitric acid, in which the material contained in the spent nuclear fuel is dissolved, is used as a processing soln. 7, a granular semiconductor photocatalyst 8 is used as the semiconductor photocatalyst, and the dissolved material is oxidized or reduced in the presence of a water-soluble electron acceptor or an electron donor. The excitation light 4 emitted from a light source 1 is passed through a glass filter 2 and deflected by a reflecting mirror 3 to irradiate the processing soln. 7 in a reaction vessel 5. The processing soln. 7 contains the fine particle of the photocatalyst 8 which is uniformly dispersed by a stirrer 11. The oxidation or reduction efficiency of the dissolved material is drastically enhanced.

30. 发明专利

JPH0424434B2 失效
公开(公告)号：JPH0424434B2
公开(公告)日：1992-04-27
申请号：JP19757382
申请日：1982-11-12
申请人： HITACHI LTD
发明人： OZAWA YOSHIHIRO , ENDO MASAO , UCHIDA SHUNSUKE , KITAMURA MASAO
IPC分类号： F28F19/02 , C23C22/00 , C23C22/68 , F28F19/06 , G21D1/00

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