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31. 发明专利

JPH11118990A METHOD FOR TREATING RADIOACTIVE LIQUID WASTE 失效
公开(公告)号：JPH11118990A
公开(公告)日：1999-04-30
申请号：JP28005897
申请日：1997-10-14
申请人： HITACHI LTD
发明人： NOSHITA KENJI , NISHI TAKASHI , YUKITA ATSUSHI , MATSUDA MASAMI
IPC分类号： G21F9/16
摘要： PROBLEM TO BE SOLVED: To dissolve a large amount of boron by an evaporation condensation process, suppress the deposition of boric acid salt, and at the same time achieve a high- magnification condensation by increasing the pH of liquid waste in an alkali addition process larger than 12. SOLUTION: After a boric acid liquid waste is supplied to a pH adjustment tank 4, a valve 6 is opened and sodium hydroxide in an alkali storage tank 5 is supplied to the tank 4. In the meantime, an agitator 7 is driven, thus agitating the boric acid liquid waste and NaOH and making uniform the composition. Then, a solution where pH is adjusted to at least 13 is supplied into a total amount condenser 10 by opening a valve 9. After that, the solution is heated at 100 deg.C under the atmosphere by a heater 10a and is subjected to evaporation condensation treatment, thus setting a boron concentration to approximately 150 g/L. More specifically, the amount of the solution is condensed from 3,000 L to approximately 100 L, which is approximately 30 times larger. After the condensed liquid is supplied to a kneading machine 12, a specific amount of ordinary portland cement in a curing material tank 13 is supplied to the kneading machine 12. By setting pH to 13 or more before curing, the curing reaction of cement can be promoted preferentially due to the precipitation reaction caused by boric acid ion.

32. 发明专利

JPH10227895A SOLIDIFICATION PROCESSING METHOD OF RADIOACTIVE WASTE 失效
公开(公告)号：JPH10227895A
公开(公告)日：1998-08-25
申请号：JP3004197
申请日：1997-02-14
申请人： HITACHI LTD
发明人： NOSHITA KENJI , NISHI TAKASHI
IPC分类号： G21F9/16
摘要： PROBLEM TO BE SOLVED: To improve holding performance for radioactive iodine of radioactive waste solid body by adding an oxidizing agent of a specific concentration in the case of solidifying processing radioactive waste with a cement group solidifier agent. SOLUTION: In solidifying processing, condensed waste liquid is supplied form a waste liquid tank 1 through a constant amount supply device 4 to a kneader 5 and a cement group solidifying agent is supplied from a solidifying agent tank 2 through a quantifying supply device 6 to the kneader 5. The oxidizing agent is supplied so as to be 0.01mol for 100g of waste solid weight from a oxidizing agent tank 3 through a constant amount supply device 7 to the kneader 5. For oxidizing agent, peroxodisulfate, silver oxide, permanganate or dichromate are used. After sufficiently mixing with the kneader 5, the cement paste of the condensed waste liquid is injected in a solidifying vessel 9 with an electromagnetic valve 8 and is statically cured for ca. a month. By this, holding capability of radioactive iodine of solid by cement group solidifying agent can be improved.

33. 发明专利

JPH09218297A METHOD FOR TREATING RADIOACTIVE WASTE 失效
公开(公告)号：JPH09218297A
公开(公告)日：1997-08-19
申请号：JP6415197
申请日：1997-03-18
申请人： HITACHI LTD , HITACHI ENG SERVICE
发明人： MATSUDA MASAMI , NISHI TAKASHI , KIKUCHI JUN , IZUMIDA TATSUO , TAMADA SHIN , KIUCHI YOSHIMASA
IPC分类号： G21F9/10 , G21F9/16 , G21F9/30
摘要： PROBLEM TO BE SOLVED: To improve retain ability (distribution factor) of a radioactive waste solidified body to C-14. SOLUTION: A condensed waste liquid is dried, powdered and turned into pellets. The pellets are filled in a solidification container 4. A paste of solidifying material including a soluble substance which reacts with carbonic acid ions and produces an insoluble compound is formed. The paste of solidifying material is injected in the solidification container 4 filled with the pellets. The soluble substance reacting with carbonic acid ions and producing an insoluble compound reacts with C-14 in the pellets, whereby the C-14 becomes the insoluble compound. Accordingly, the retain ability (distribution factor) of a waste solidified body to the C-14 is improved nearly by one digit.

34. 发明专利

JPH08285995A METHOD FOR SOLIDIFICATION PROCESS OF RADIOACTIVE WASTE 失效
公开(公告)号：JPH08285995A
公开(公告)日：1996-11-01
申请号：JP9385795
申请日：1995-04-19
申请人： HITACHI LTD
发明人： NOSHITA KENJI , MATSUDA MASAMI , NISHI TAKASHI , KOMORI ITARU , MATSUO TOSHIAKI , IZUMIDA TATSUO
IPC分类号： G21F9/16 , G21F9/30
摘要： PURPOSE: To perform favorably reduced volume solidification processing by using a relative value of weight of both normal Portland cement and amorphous silica addition material in a particular range. CONSTITUTION: When amorphous silica addition material is added so that weight A of normal Portland cement and the weight B of the amorphous silica addition material may be in an expression of 0.20

35. 发明专利

JPH08129100A DISPOSAL METHOD OF RADIOACTIVE WASTE 失效
公开(公告)号：JPH08129100A
公开(公告)日：1996-05-21
申请号：JP26653294
申请日：1994-10-31
申请人： HITACHI LTD
发明人： NOSHITA KENJI , MATSUDA MASAMI , NISHI TAKASHI , KOMORI ITARU , MATSUO TOSHIAKI , IZUMIDA TATSUO
IPC分类号： G21F9/30
摘要： PURPOSE: To reduce residual coverage onto a disposal equipment by crushing massive radioactive waste, mixing the crushed waste with a solidifying material and infecting the mixture into a solidifying container. CONSTITUTION: When incinerated ash in a storage container 1 is charged into an incinerated-ash hopper 4 and a valve 5 is opened, the inside of a cage type rotor for a crusher 6 is supplied with incinerated ash. Moistened massive incinerated ash is shocked by pin shields, in which adjacent rows in the rotor are rotated in the opposite directions mutually, and crushed. Incinerated ash, in which massive ash is crushed completely, is introduced into a screw feeder 7, and the inside of a kneading machine 8 is supplied with incinerated ash by driving the feeder 7. Incinerated ash fed into the kneading machine 8 is kneaded with previously charged cement paste by an agitator 13, the inside of a solidifying container 15 is fed with these mixtures through an outlet piping by opening a solenoid valve 14, an upper end is sealed with a cover, and the solidifying container 15 is carried into a solidifying-container storage region.

36. 发明专利

JPH0875898A TREATING METHOD FOR RADIOACTIVE WASTE AND SOLIDIFIED BODY OF RADIOACTIVE WASTE 失效
公开(公告)号：JPH0875898A
公开(公告)日：1996-03-22
申请号：JP20952294
申请日：1994-09-02
申请人： HITACHI LTD
发明人： NISHI TAKASHI , MATSUDA MASAMI , NAITO TAKASHI
IPC分类号： G21F9/30
摘要： PURPOSE: To carry out solidifying treatment of radioactive waste at a temperature at which radioactive nuclides does not evaporate and improve sealing function for the nuclides by mixing oxide-based glass consisting of specified elements and the radioactive nuclides at a specified temperature and solidifying the mixture. CONSTITUTION: Oxide-based glass consisting of at least vanadium, phosphorus, and antimony is softened, fluidized, and uniformly mixed with radioactive waste at 400-550 deg.C at which radioactive nuclides such as iodine, etc., do not evaporate. Especially, anitmony has a function to reduce vanadium, which is normally in pentavalent state, to tetravalence and the structure of the glass is made to be three-dimensional to improve the water-proofness of the glass. To maintain the water-proofness of the glass, it is preferable to convert 40% or more of vanadium contained in the oxide-based glass into tetravalent vanadium. It is also preferable that the composition of the oxide-based glass consists of 30-60wt.% of V2 O5 , 15-30wt.% of P2 O5 , and 10-30wt.% of Sb2 O3 (in conversion into oxides, respectively).

37. 发明专利

JPH0829594A SOLIDIFICATION OF RADIOACTIVE WASTE 失效
公开(公告)号：JPH0829594A
公开(公告)日：1996-02-02
申请号：JP16178794
申请日：1994-07-14
申请人： HITACHI LTD
发明人： MATSUDA MASAMI , NISHI TAKASHI , NOSHITA KENJI , KOMORI ITARU , IZUMIDA TATSUO , OURA MASATO
IPC分类号： G21F9/16 , G21F9/30 , G21F9/36
摘要： PURPOSE:To achieve reduction of the treating cost and enhancement of the reliability simultaneously by solidifying various types of radioactive waste using a single facility. CONSTITUTION:Concentrated waste liquid 1, waste resin 3, and the like are kneaded by means of a kneader 10 along with a hydraulic hardener and filled in a drum can 23. Miscellaneous solids are previously filled in the drum can 23 and injected into the gap of the drum can using a hydraulic harclener paste produced by means of the kneader 10. Fluidity of the kneaded material or paste produced using the hydraulic hardener is regulated by controlling the supply of fluidizing agent from a fluidizing agent supply tank 17. Consequently, the solidification cost can be reduced while lessening the burden on the operator and the radioactive waste can be solidified soundly and stably.

38. 发明专利

JPH06180393A SOLIDIFYING METHOD OF RADIOACTIVE WASTE 失效
公开(公告)号：JPH06180393A
公开(公告)日：1994-06-28
申请号：JP33409392
申请日：1992-12-15
申请人： HITACHI LTD
发明人： NOSHITA KENJI , MATSUDA MASAMI , NISHI TAKASHI , KOMORI ITARU
IPC分类号： G21F9/30
摘要： PURPOSE:To increase the elution rate of cation while reducing treatment cost using normal cement by performing solidification on condition that bivalent cations of Ca are increased for the cement at the time of hardening reaction. CONSTITUTION:A water hardening inorganic solidification material is subjected to main hardening process where water reacts on the surface of the hardening material to produce a hydrate from which bivalent cations of Ca are then eluted. The reaction progresses gradually into the solidifying material and sustains until the bivalent cation of Ca exceeds a saturable solubility. When the saturable solubility is exceeded, Ca(OH)2 is deposited on the surface of the solidifying material. At that time, concentration of bivalent cation of Ca in the liquid increases and a part of cations of Ca stays in the solidifying material thus creating a gel phase of CaO-SiO2-H2O. Consequently, hardening is ended within a normal interval by adding a Ca compound having high solubility or increasing elution rate of bivalent cation of Ca from the solidifying material through high temperature curing.

39. 发明专利

JPH05312996A METHOD FOR SOLIDIFYING RADIOACTIVE WASTE 失效
公开(公告)号：JPH05312996A
公开(公告)日：1993-11-26
申请号：JP12322392
申请日：1992-05-15
申请人： HITACHI LTD
发明人： NOSHITA KENJI , MATSUDA MASAMI , NISHI TAKASHI , KOMORI ITARU
IPC分类号： B09B3/00 , G21F9/16
摘要： PURPOSE:To reduce hydrogen generation due to radiation decomposition and improve the long term soundness of a solid by controlling the organic substance concentration in the solid. CONSTITUTION:Due to radiation decomposition of water contained in a solid body, hydrogen is generated. The hydrogen generation rate per unit of radiation is affected by organic substances contained as impurity in hydraulic-setting inorganic hardening agent. Thus, in a solidifying agent tank 1, the hydraulic- setting inorganic solidifying agent as a solidifying agent and various additives are sufficiently mixed at proper mixing ratio and stored. After eliminating organic substances from this solidifying agent powder with an organic substance elimination device, a constant amount of powder is supplied to a mixer 6 with a constant amount conveyer 3 and sufficiently mixed with mixing water from a mixing water tank 4 to form a paste. After injecting this paste in a solidifying vessel 8 containing miscellaneous solids 9, a vessel lid is put on to leave it for a month until a solid is made. In this process in the device 2, organic matter is eliminated to lower than ca. 500ppm concentration by using a filter, aborption agent, burner and chemical reactions, etc., to improve the long term soundness of the solid.

40. 发明专利

JPH05171309A DEVICE FOR REMOVING AND RECOVERING NOBLE METAL FROM AQUEOUS SOLUTION 失效
公开(公告)号：JPH05171309A
公开(公告)日：1993-07-09
申请号：JP33688091
申请日：1991-12-19
申请人： HITACHI LTD
发明人： HOSHIKAWA TADAHIRO , SASAHIRA AKIRA , NISHI TAKASHI , CHINO KOICHI , BABA TSUTOMU , IKEDA TAKASHI
IPC分类号： C22B11/00 , C25C1/20 , G21F9/04
摘要： PURPOSE:To remove and recover noble metals from a waste aq. soln. contg. metals such as the radioactive waste liq. having a high content of nitric acid from the nuclear fuel reprocessing plant by using this device. CONSTITUTION:A moving endless electrode (formed on the outer surface of a rotary drum 2) having the metallic surface of gold, silver, platinum, etc., is brought into contact with the mercury 5 held in a bottomless vessel 3 to form the amalgam and continuously passed through a noble metal-contg. aq. soln. in tank 1 with the amalgam as a cathode. The electrodeposited noble metal is occluded in the amalgam. The amalgam leaving the soln. is scraped off from the metallic surface of the endless electrode by a scraper 7 and recovered in a vessel 8. The exposed metal on the electrode surface is again amalgamated and repeatedly processed in the same way as above.

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