JPS6228440B2 - - Google Patents
Info
- Publication number
- JPS6228440B2 JPS6228440B2 JP60252619A JP25261985A JPS6228440B2 JP S6228440 B2 JPS6228440 B2 JP S6228440B2 JP 60252619 A JP60252619 A JP 60252619A JP 25261985 A JP25261985 A JP 25261985A JP S6228440 B2 JPS6228440 B2 JP S6228440B2
- Authority
- JP
- Japan
- Prior art keywords
- powder
- mixer
- thermosetting resin
- waste
- tank
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000000843 powder Substances 0.000 claims description 34
- 239000011347 resin Substances 0.000 claims description 16
- 229920005989 resin Polymers 0.000 claims description 16
- 229920001187 thermosetting polymer Polymers 0.000 claims description 13
- 239000002901 radioactive waste Substances 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 239000000654 additive Substances 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 239000002699 waste material Substances 0.000 description 14
- 238000002156 mixing Methods 0.000 description 12
- 239000003505 polymerization initiator Substances 0.000 description 7
- 238000003860 storage Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 239000003112 inhibitor Substances 0.000 description 4
- 238000006116 polymerization reaction Methods 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000011109 contamination Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000003670 easy-to-clean Effects 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000003456 ion exchange resin Substances 0.000 description 1
- 229920003303 ion-exchange polymer Polymers 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Landscapes
- Processing Of Solid Wastes (AREA)
Description
本発明は放射性廃棄物固化体の製造方法に係
る。放射性廃棄物（以下単に廃棄物と呼ぶ）をア
スフアルト、セメント等に混合して安定な固体化
とすることは現在一般に行われている。一方、熱
硬化性樹脂と廃棄物を混合して固化体を得る方法
も開発されつつある。
後者、すなわち熱硬化性樹脂を使用するものに
おいて、廃棄物を一たん乾燥し、その廃棄物を熱
硬化性樹脂と混合し固化すればその発生量を少く
することができる。また樹脂の硬化反応を生じさ
せる重合開始剤として常温で作用するものを使用
すれば、混合終了後、混合物をドラム罐等の適宜
容器に移し放置すれば加熱することなく固化体が
得られる。しかし乍ら、乾燥された廃棄物は粉体
状であり飛散し易く樹脂との混合前に環境を汚染
するおそれがある。
また、常温で作用する重合開始剤を使用するこ
とにより混合機で混合中にも硬化が開始されるの
で、混合時間が問題となる。また、混合終了後混
合物を容器に移した時、混合機内に付着残留した
混合物が固化し混合機の故障の原因となるので、
混合終了後混合機を洗滌して残留した混合物を除
去する必要がある。ところが、この洗滌により生
じた洗滌廃液は放射性廃棄物であり、処理が必要
となる。
本発明は上記の事情に基きなされたもので、常
温に作用する重合開始剤を使用する熱硬化性樹脂
によるものであつて、廃棄物粉体による汚染を生
じるおそれがなく、しかも混合機の洗滌を常に必
要としない放射性廃棄物の固化体製造方法を得る
ことを目的としている。
本発明においては、放射性廃棄液を乾燥して粉
体とする乾燥機と廃棄物粉体と熱硬化性樹脂、添
加剤とを混合する混合機とを密閉結合し、且つ混
合機を冷却して前記目的を達成している。
以下、図面につき本発明の詳細を説明する。図
に示すように、本発明の方法が適用される装置
は、放射性の廃液から廃棄物粉体を作る粉体製造
部１と、前記粉体と固化剤とを混合する混合部２
とから構成されている。粉体製造部１は、廃液タ
ンク３と、このタンクからポンプ４により流量計
５、弁６を経由して廃液を供給される乾燥機７
と、この乾燥機７により得られた粉体を粉体貯蔵
槽８に送込む粉体輸送機９と、貯蔵槽８の粉体を
混合部２の混合機１０に定量供給する粉体供給機
１１とをそなえている。なお、図中１２は乾燥機
７を加熱する熱媒、１３は乾燥機７から排出され
る排気中の蒸気を復水させるための凝縮器、１４
は前記廃棄中の非凝縮ガスを抽出する抽気装置、
１５は凝縮器１３を冷却する冷却水をそれぞれ示
している。また、粉体貯蔵槽８の側壁には粉体の
出口近傍におけるブリツジングを防止する加振器
１６が設けられている。
一方、混合部２の混合機１０は、−20℃以下の
冷却液１７が（冷媒）が流されるクーリングジヤ
ケツト１８を有している。
なおクーリングジヤケツト１８に供給される冷
却の温度が−20℃以下であつても、混合機１０内
の混合物の温度は５℃程度のプラス温度に制御出
来ることは一般に知られていることであり、混合
物の温度は処理時間の間隔に応じて適切に制御す
ればよい。
さらに、混合機１０には、熱硬化性樹脂タンク
１９から熱硬化性樹脂がポンプ２０により、流量
計２１、弁２２を経由して供給される。また、重
合開始剤タンク２３同促進剤タンク２４、同禁止
剤タンク２５からも、それら添加剤が同様にして
適時に供給される。なお２６，２７，２８はポン
プ、２９，３０，３１は流量計、３２，３３，３
４は弁をそれぞれ示している。また、３５は混合
機１０からの混合物を受容する受容器を示す。さ
らに、３ａ，１０ａ，１９ａ，２３ａ，２４ａ，
２５ａはそれぞれ液面計、１９ｂ，２３ｂ，２４
ｂ，２５ｂは温度計、８ａは粉面計をそれぞれ示
している。
上記本発明の方法が適用される装置において、
廃棄物は廃液タンク３より前述の各装置により乾
燥機７へ供給され乾燥される。乾燥された粉体は
粉体貯蔵槽８で一時貯蔵される。粉体を一時貯蔵
することにより、所定量の粉体が貯蔵れておれば
乾燥機７の運転状況に関係なく混合部２を稼動さ
せることができる。粉体は粉体供給機１１により
混合機１０へ送り込まれる。混合機１０におい
て、粉体はポンプ２０等により供給された熱硬化
性樹脂、重合開始剤等と混合され適宜容器へ排出
される。粉体が混合機１０から排出されるときは
スラリー状になつているため粉体飛散のおそれは
なくなつている。したがつて粉体製造部１の各装
置を密閉構造としたことにより、粉体飛散による
汚染の問題はほとんどなくなる。
又混合機１０は冷却されているため混合機内部
に付着した熱硬化性樹脂の硬化を必要時間延長出
来る。第１表に示したように−20℃に冷却した場
合は硬化時間は１日であり、本発明装置を毎日運
転している場合は、混合機内部に付着したものが
硬化する前に新しい熱硬化性樹脂、粉体等が供給
されるため、付着物はそれらと共に混合され、排
出される。したがつて混合機内部での硬化はおこ
らない。
なお、第１表に示したように熱硬化性樹脂に適
当量の重合禁止剤を添加することにより硬化時間
を１週間以上に延長することができるため、通常
の稼動状態において週末に本発明の装置の運転を
休止したときにも洗浄の必要はなくなる。したが
つて長期の運転休止以外は混合機を洗浄する必要
はない。
The present invention relates to a method for producing solidified radioactive waste. It is currently common practice to mix radioactive waste (hereinafter simply referred to as waste) with asphalt, cement, etc. to form a stable solid. On the other hand, a method for obtaining a solidified material by mixing thermosetting resin and waste is also being developed. In the latter case, that is, one that uses a thermosetting resin, the amount generated can be reduced by drying the waste once and then mixing the waste with the thermosetting resin and solidifying it. Furthermore, if a polymerization initiator that acts at room temperature is used to cause the curing reaction of the resin, a solidified product can be obtained without heating by transferring the mixture to an appropriate container such as a drum can after mixing and leaving it to stand. However, the dried waste is in the form of powder and easily scatters, which may contaminate the environment before it is mixed with the resin. Furthermore, by using a polymerization initiator that acts at room temperature, curing starts even during mixing in a mixer, so the mixing time becomes a problem. Also, when the mixture is transferred to a container after mixing, the mixture remaining inside the mixer may solidify and cause the mixer to malfunction.
After mixing, it is necessary to wash the mixer to remove any remaining mixture. However, the cleaning waste generated by this cleaning is radioactive waste and must be disposed of. The present invention has been made based on the above circumstances, and is based on a thermosetting resin that uses a polymerization initiator that acts at room temperature, so there is no risk of contamination with waste powder, and moreover, it is easy to clean the mixer. The purpose of this study is to obtain a method for producing solidified radioactive waste that does not always require In the present invention, a dryer that dries radioactive waste liquid into powder and a mixer that mixes the waste powder, thermosetting resin, and additives are hermetically connected, and the mixer is cooled. The above objectives have been achieved. The invention will be explained in detail below with reference to the drawings. As shown in the figure, the apparatus to which the method of the present invention is applied includes a powder manufacturing section 1 that produces waste powder from radioactive waste liquid, and a mixing section 2 that mixes the powder and a solidifying agent.
It is composed of. The powder manufacturing unit 1 includes a waste liquid tank 3 and a dryer 7 to which waste liquid is supplied from the tank by a pump 4 via a flow meter 5 and a valve 6.
, a powder transport machine 9 that sends the powder obtained by the dryer 7 to a powder storage tank 8, and a powder feeder that supplies a fixed amount of the powder in the storage tank 8 to the mixer 10 of the mixing section 2. It has 11. In the figure, 12 is a heat medium for heating the dryer 7, 13 is a condenser for condensing steam in the exhaust gas discharged from the dryer 7, and 14 is a heat medium for heating the dryer 7.
is an extraction device for extracting the non-condensable gas being disposed of;
15 indicates cooling water for cooling the condenser 13, respectively. Further, a vibrator 16 is provided on the side wall of the powder storage tank 8 to prevent bridging near the outlet of the powder. On the other hand, the mixer 10 of the mixing section 2 has a cooling jacket 18 through which a cooling liquid 17 (refrigerant) of -20 DEG C. or lower is flowed. It is generally known that even if the temperature of the cooling supplied to the cooling jacket 18 is -20°C or lower, the temperature of the mixture in the mixer 10 can be controlled to a plus temperature of about 5°C. The temperature of the mixture may be appropriately controlled depending on the treatment time interval. Furthermore, thermosetting resin is supplied to the mixer 10 from a thermosetting resin tank 19 by a pump 20 via a flow meter 21 and a valve 22 . Further, these additives are also supplied from the polymerization initiator tank 23, accelerator tank 24, and inhibitor tank 25 in a similar manner at a suitable time. In addition, 26, 27, 28 are pumps, 29, 30, 31 are flow meters, 32, 33, 3
4 indicates a valve, respectively. Further, 35 indicates a receiver for receiving the mixture from the mixer 10. Furthermore, 3a, 10a, 19a, 23a, 24a,
25a are liquid level gauges, 19b, 23b, 24
25b and 25b are thermometers, and 8a is a powder level meter, respectively. In the apparatus to which the method of the present invention is applied,
The waste is supplied from the waste liquid tank 3 to the dryer 7 and dried by each of the above-mentioned devices. The dried powder is temporarily stored in a powder storage tank 8. By temporarily storing the powder, the mixing section 2 can be operated regardless of the operating status of the dryer 7 as long as a predetermined amount of powder is stored. The powder is fed into the mixer 10 by a powder feeder 11. In the mixer 10, the powder is mixed with a thermosetting resin, a polymerization initiator, etc. supplied by a pump 20, etc., and is discharged into a container as appropriate. When the powder is discharged from the mixer 10, it is in the form of a slurry, so there is no longer any risk of powder scattering. Therefore, by providing each device in the powder manufacturing section 1 with a closed structure, the problem of contamination due to powder scattering is almost eliminated. Further, since the mixer 10 is cooled, the curing of the thermosetting resin adhering to the inside of the mixer can be extended for the necessary time. As shown in Table 1, when the mixer is cooled to -20°C, the curing time is one day, and if the device of the present invention is operated every day, the hardening time is 1 day before the material adhering to the inside of the mixer is cured. Since curable resin, powder, etc. are supplied, deposits are mixed with them and discharged. Therefore, no curing occurs inside the mixer. As shown in Table 1, by adding an appropriate amount of polymerization inhibitor to the thermosetting resin, the curing time can be extended to one week or more. There is no need for cleaning even when the device is out of operation. Therefore, there is no need to clean the mixer unless it is out of operation for a long period of time.
【表】
この表から重合禁止剤を添加しない場合には常
温ならば数時間で硬化し、−20℃であつても半日
〜１日で硬化することがわかる。また、添加量が
重合開始剤のそれに比し適用であれば常温でも１
週間は硬化せず−20℃では１週間以上に硬化時間
が延長されることがわかる。
次に具体例として本発明の方法により放射性廃
棄物の一つであるNa2So4溶液、イオン交換樹脂
を含むスラリーを乾燥固化した。その結果を第２
表に示す。[Table] From this table, it can be seen that when no polymerization inhibitor is added, it will cure in several hours at room temperature, and will cure in half a day to one day even at -20°C. In addition, if the amount added is compared to that of the polymerization initiator, even at room temperature 1
It can be seen that the curing time was not cured for a week, but the curing time was extended to more than one week at -20°C. Next, as a specific example, a slurry containing a Na 2 So 4 solution, which is one of the radioactive wastes, and an ion exchange resin was dried and solidified by the method of the present invention. The second result is
Shown in the table.
【表】
この表から、本発明の方法により充分安定な固
化体が得られることがわかる。
なお、本発明は上記実施例のみに限定されな
い。乾燥機７と混合機１０の運転を連動させる場
合、粉体貯蔵槽８を省略した装置にも適用でき
る。[Table] This table shows that a sufficiently stable solidified product can be obtained by the method of the present invention. Note that the present invention is not limited to the above embodiments. When the dryer 7 and mixer 10 are operated in conjunction with each other, the present invention can also be applied to an apparatus in which the powder storage tank 8 is omitted.
図は本発明一実施例の流れ図である。
１…粉体製造部、２…混合部、３…廃液タン
ク、７…乾燥機、８…粉体貯蔵槽、１０…混合
機、１８…クーリングジヤケツト、１９…熱硬化
性樹脂タンク、２３…重合開始剤タンク、２４…
重合促進剤タンク、２５…重合禁止剤タンク。
The figure is a flowchart of one embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Powder production department, 2... Mixing part, 3... Waste liquid tank, 7... Dryer, 8... Powder storage tank, 10... Mixer, 18... Cooling jacket, 19... Thermosetting resin tank, 23... Polymerization initiator tank, 24...
Polymerization accelerator tank, 25...polymerization inhibitor tank.
Claims (1)
混合機に密閉結合手段を介して移送し、この混合
機に熱硬化性樹脂並びに各種添加材を移送し、さ
らにこの混合機に設けられたクーリングジヤケツ
トに−20℃以下の冷媒を供給し、冷却しながら上
記粉体及び熱硬化性樹脂並びに各種添加材を混合
し、混合後この混合物を混合機から排出し、その
後も必要時間この混合機を冷却してなることを特
徴とする放射性廃棄物固化体の製造方法。1 Dry and powder the radioactive waste liquid, transfer this powder to a mixer via a sealed coupling means, transfer the thermosetting resin and various additives to this mixer, and furthermore, The above powder, thermosetting resin, and various additives are mixed while cooling the cooling jacket, and the mixture is discharged from the mixer. A method for producing solidified radioactive waste, comprising cooling a mixer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25261985A JPS61137100A (en) | 1985-11-13 | 1985-11-13 | Production unit for radioactive waste solidified body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25261985A JPS61137100A (en) | 1985-11-13 | 1985-11-13 | Production unit for radioactive waste solidified body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61137100A JPS61137100A (en) | 1986-06-24 |
| JPS6228440B2 true JPS6228440B2 (en) | 1987-06-19 |
Family
ID=17239878
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25261985A Granted JPS61137100A (en) | 1985-11-13 | 1985-11-13 | Production unit for radioactive waste solidified body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61137100A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52153100A (en) * | 1976-06-14 | 1977-12-19 | Hitachi Ltd | Treating method and device for radioactive waste |
| JPS5430400A (en) * | 1977-08-10 | 1979-03-06 | Hitachi Ltd | Radioactive watse processing method |
-
1985
- 1985-11-13 JP JP25261985A patent/JPS61137100A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52153100A (en) * | 1976-06-14 | 1977-12-19 | Hitachi Ltd | Treating method and device for radioactive waste |
| JPS5430400A (en) * | 1977-08-10 | 1979-03-06 | Hitachi Ltd | Radioactive watse processing method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61137100A (en) | 1986-06-24 |
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