JPH11148998A - Solidification material for radioactive waste liquid containing sodium sulfate and solidification processing method - Google Patents
Solidification material for radioactive waste liquid containing sodium sulfate and solidification processing methodInfo
- Publication number
- JPH11148998A JPH11148998A JP31559197A JP31559197A JPH11148998A JP H11148998 A JPH11148998 A JP H11148998A JP 31559197 A JP31559197 A JP 31559197A JP 31559197 A JP31559197 A JP 31559197A JP H11148998 A JPH11148998 A JP H11148998A
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- Prior art keywords
- sodium sulfate
- waste liquid
- solidification
- radioactive waste
- solidifying
- Prior art date
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、硫酸ナトリウム含
有放射性廃液固化用材及び固化処理方法に関し、より詳
細には、ＢＷＲ発電所濃縮廃液，ＰＷＲ発電所樹脂溶離
廃液等の硫酸ナトリウム含有廃棄物を高充填固化処理す
るための固化用材及び固化処理方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a material for solidifying a radioactive waste liquid containing sodium sulfate and a solidification treatment method, and more particularly to a method for solidifying a waste liquid containing sodium sulfate such as a concentrated waste liquid of a BWR power station and a resin elution waste liquid of a PWR power station. The present invention relates to a solidification material and a solidification method for performing a solidification treatment.
【０００２】[0002]
【従来の技術】ＢＷＲ発電所等から廃棄物として発生す
る硫酸ナトリウム（硫酸ソーダ）は、プラスチック固化
あるいはペレット化されて中間貯蔵されている。しかし
ながらプラスチック固化体は一期埋設場では２割以上埋
設できず、また潜在的火災の可能性がある。一方、硫酸
ナトリウムをセメントで高充填固化すると、混練時の流
動性や固化体の圧縮強度が良好であっても、固化後の耐
水性が充分でなく、膨潤してひび割れ崩壊する現象が生
じる。このため従来のセメント固化においては硫酸ナト
リウムの充填量を制限し、例えば、２００Ｌドラム缶当
たり充填率８％，約３０kg程度の充填量としていた。2. Description of the Related Art Sodium sulfate (sodium sulfate) generated as waste from a BWR power plant or the like is solidified or pelletized in plastic and stored intermediately. However, more than 20% of the solidified plastic cannot be buried at the first-stage burial site, and there is a possibility of a potential fire. On the other hand, when sodium sulfate is highly filled and solidified with cement, even if the fluidity at the time of kneading and the compressive strength of the solidified body are good, the water resistance after solidification is not sufficient, and the phenomenon of swelling and cracking occurs. For this reason, in the conventional solidification of cement, the filling amount of sodium sulfate is limited, for example, the filling rate is about 30 kg at a filling rate of 8% per 200 L drum.
【０００３】[0003]
【発明が解決しようとする課題】このような耐水性不良
により膨潤する現象が解決されれば、硫酸ナトリウムを
ドラム缶に約２００kg程度充填可能となり、従来のセメ
ント固化法に比較して、６〜７倍の充填量となる。すな
わち、廃棄体発生量を６分の１以下に減少させることが
でき、処分コストの削減につながる。この充填率の値は
プラスチック固化処理における充填量に匹敵するもので
あり、既存の処理設備を置き換えていくことが可能とな
る。また、ＰＷＲ発電所においても、保存されているイ
オン交換樹脂の溶離が計画されており、硫酸ナトリウム
が発生する見通しで、この廃液の固化処理を適用するこ
とが可能になり処理対象が拡大される。If the phenomenon of swelling due to such poor water resistance is solved, about 200 kg of sodium sulfate can be filled in a drum, which is 6 to 7 times more than the conventional cement hardening method. Double the filling amount. That is, the amount of waste generated can be reduced to 1/6 or less, which leads to a reduction in disposal costs. This value of the filling rate is comparable to the filling amount in the plastic solidification treatment, and it is possible to replace existing processing equipment. Also in the PWR power plant, elution of the stored ion-exchange resin is planned, and it is expected that sodium sulfate will be generated. .
【０００４】本発明は、上述のごとき実情に鑑みてなさ
れたもので、固化体における良好な耐水性が得られ、高
充填率でセメント固化が可能な硫酸ナトリウム含有放射
性廃液固化用材及び固化処理方法を提供することを目的
とするものである。The present invention has been made in view of the above-mentioned circumstances, and provides a material for solidifying a sodium sulfate-containing radioactive waste liquid capable of obtaining a solidified body having good water resistance, being capable of solidifying cement at a high filling rate, and a method of solidifying. The purpose is to provide.
【０００５】[0005]
【課題を解決するための手段】請求項１の発明は、高炉
水砕スラグ，アルカリ土類金属塩，及び硬化刺激剤を原
料として有することを特徴としたものである。The invention of claim 1 is characterized in that it comprises granulated blast furnace slag, an alkaline earth metal salt, and a hardening stimulant as raw materials.
【０００６】請求項２の発明は、請求項１の発明におい
て、更に硬化調整剤，微粉，針状無機質粉末，及び分散
剤から選ばれる１種以上を原料として有することを特徴
としたものである。According to a second aspect of the present invention, there is provided the method of the first aspect, further comprising, as a raw material, at least one selected from a curing modifier, a fine powder, an acicular inorganic powder, and a dispersant. .
【０００７】請求項３の発明は、請求項１又は２の発明
において、前記アルカリ土類金属塩が塩化バリウム，硝
酸バリウム，塩化ストロンチウム，及び硝酸ストロンチ
ウムから選ばれる１種以上であることを特徴としたもの
である。The invention of claim 3 is characterized in that, in the invention of claim 1 or 2, the alkaline earth metal salt is at least one selected from barium chloride, barium nitrate, strontium chloride, and strontium nitrate. It was done.
【０００８】請求項４の発明は、硫酸ナトリウム含有放
射性廃液とアルカリ土類金属塩とを混合して加熱濃縮す
る混合・加熱濃縮工程と、高炉水砕スラグ及び硬化刺激
剤を含有する固化材と前記混合・加熱濃縮工程で得られ
た加熱濃縮物とを混練する混練工程と、該混練工程で得
られた混練物を養生固化する養生固化工程を有すること
を特徴としたものである。A fourth aspect of the present invention provides a mixing and heating concentration step of mixing and heating and concentrating a radioactive waste solution containing sodium sulfate and an alkaline earth metal salt, and a solidifying material containing granulated blast furnace slag and a hardening stimulant. It is characterized by having a kneading step of kneading the heat concentrate obtained in the mixing and heat concentration step, and a curing and solidifying step of curing and solidifying the kneaded material obtained in the kneading step.
【０００９】請求項５の発明は、請求項４の発明におい
て、前記混練工程に用いる前記固化材を、前記高炉水砕
スラグ及び前記硬化刺激剤に加えて、更に硬化調整剤，
微粉，針状無機質粉末，及び分散剤から選ばれる１種以
上を含有する固化材とすることを特徴としたものであ
る。According to a fifth aspect of the present invention, in the fourth aspect of the present invention, in addition to the granulated blast furnace slag and the hardening stimulant, the hardened material used in the kneading step is further added with a hardening modifier,
A solidified material containing at least one selected from fine powder, acicular inorganic powder, and dispersant.
【００１０】請求項６の発明は、請求項４又は５の発明
において、前記アルカリ土類金属塩として、塩化バリウ
ム，硝酸バリウム，塩化ストロンチウム，及び硝酸スト
ロンチウムから選ばれる１種以上を用いることを特徴と
したものである。A sixth aspect of the present invention is characterized in that, in the fourth or fifth aspect, at least one selected from the group consisting of barium chloride, barium nitrate, strontium chloride, and strontium nitrate is used as the alkaline earth metal salt. It is what it was.
【００１１】請求項７の発明は、請求項４ないし６いず
れか１の発明において、前記混合・加熱濃縮工程で前記
硫酸ナトリウム含有放射性廃液と混合する前記アルカリ
土類金属塩の量を、前記硫酸ナトリウム含有放射性廃液
に含まれる硫酸ナトリウムに対して１〜１００ｍｏｌ％
とすることを特徴としたものである。The invention of claim 7 is the invention according to any one of claims 4 to 6, wherein the amount of the alkaline earth metal salt mixed with the sodium sulfate-containing radioactive waste liquid in the mixing / heating and concentrating step is adjusted to the amount of the sulfuric acid. 1 to 100 mol% based on sodium sulfate contained in sodium-containing radioactive waste liquid
It is characterized by the following.
【００１２】[0012]
【発明の実施の形態】前述したごとくに、硫酸ナトリウ
ムのセメント固化体は、湿空養生中あるいは水中養生中
に膨潤現象を起こし、ひび割れる現象が生じる場合があ
る。湿空養生中に膨潤し、ひび割れて固化体表面に生じ
た結晶をＸ線回折による分析測定を行った結果、この結
晶がＮａ2ＳＯ4・１０Ｈ2Ｏであることが確認された。
すなわち、固化体中の無水硫酸ナトリウム（Ｎａ2Ｓ
Ｏ4）が、空気中あるいは水中の水と反応して含水塩化
し、容積が増して膨潤し、固化体にひび割れや崩壊を生
じさせるものと考えられた。このような硫酸ナトリウム
固化体の耐水性不良によるひび割れ現象は、以下に示す
式によって無水塩が含水塩化することで生じると考えら
れる。DESCRIPTION OF THE PREFERRED EMBODIMENTS As described above, a solidified cement of sodium sulfate may swell during wet-air curing or underwater curing, causing a cracking phenomenon. X-ray diffraction analysis of the crystals that swelled and cracked on the surface of the solidified body during the wet-air curing showed that the crystals were Na 2 SO 4 .10H 2 O.
That is, anhydrous sodium sulfate (Na 2 S) in the solidified product
It was considered that O 4 ) reacted with water in the air or water to be hydrochlorinated, increased in volume and swelled, and caused cracking and collapse of the solidified body. It is considered that such a cracking phenomenon due to poor water resistance of the solidified sodium sulfate is caused by hydrous salting of an anhydrous salt by the following formula.
【００１３】[0013]
【数１】 (Equation 1)
【００１４】表１には、各種硫酸塩における１ｍｏｌ当
たりの結晶容積等の特性値を示した。硫酸ナトリウムが
含水塩化することで、容積が約４倍になることがわか
る。Table 1 shows characteristic values such as the crystal volume per mol of various sulfates. It can be seen that the volume is increased about four times by hydrochlorination of sodium sulfate.
【００１５】[0015]
【表１】 [Table 1]
【００１６】上記のような膨潤・ひび割れ現象を抑制す
るためには、硫酸イオンと反応して不溶性でかつモル容
積が小さい安定な物質を生成させることにより、上記
（２）式の反応による膨潤現象を抑制させることができ
ると考えられる。溶解度が低くモル容積が小さな物質と
して表１に示したように、ＳｒＳＯ4及びＢａＳＯ4に注
目し、可溶性のＳｒＣｌ2，Ｓｒ（ＮＯ3）2，Ｂａ（Ｎ
Ｏ3）2，及びＢａＣｌ2の添加による評価を試みた。In order to suppress the above-mentioned swelling and cracking phenomena, a swelling phenomenon due to the reaction of the above formula (2) is performed by reacting with sulfate ions to form a stable substance which is insoluble and has a small molar volume. Is considered to be able to be suppressed. As shown in Table 1 as substances having low solubility and small molar volume, SrSO 4 and BaSO 4 were focused on, and soluble SrCl 2 , Sr (NO 3 ) 2 , Ba (N
An evaluation was made by adding O 3 ) 2 and BaCl 2 .
【００１７】(評価方法)本発明に係る処理方法によって
得られたセメントスラリー及びセメント固化物は、以下
に示す評価法にて評価を行った。 フロー値 混練後のスラリーをＪＩＳ Ｒ-５２０１に準拠して測定
した。 圧縮強度 混練後のスラリーを４ｃｍ×４ｃｍ×１６ｃｍの圧縮強
度用型枠に流し込み、６０℃で２４時間養生して得られ
た固化体を、アムスラー型万能試験機を用いて裁荷速度
８０ｋｇｆ／秒の割合で裁荷し、測定された最大荷重値
を個化体の断面積で除して算出した。 耐水性 混練後のスラリーを直径４.５ｃｍ，高さ４.４ｃｍの耐
水性試験用型枠に流し込み、６０℃で２４時間養生して
得られた固化体を、固形物容積の１０倍量の脱イオン水
中に浸漬して、重量変化，及び体積変化を測定し、さら
に目視観察にて表面のひび割れを観察した。なお、耐水
性の評価は、その形状を保っているものを“良好”とし
た。(Evaluation Method) The cement slurry and the solidified cement obtained by the treatment method according to the present invention were evaluated by the following evaluation methods. Flow value The slurry after kneading was measured according to JIS R-5201. Compressive strength The kneaded slurry is poured into a 4 cm × 4 cm × 16 cm mold for compressive strength and cured at 60 ° C. for 24 hours. The solidified product is subjected to a loading speed of 80 kgf / sec using an Amsler universal testing machine. And calculated by dividing the measured maximum load value by the sectional area of the individualized body. Water resistance The kneaded slurry was poured into a mold for water resistance test having a diameter of 4.5 cm and a height of 4.4 cm, and cured at 60 ° C. for 24 hours. The sample was immersed in deionized water to measure the change in weight and the change in volume, and the surface was visually observed for cracks. In the evaluation of the water resistance, those having the same shape were evaluated as “good”.
【００１８】本実施例で使用した固化材，分散液，及び
硬化液の組成を以下に示す。固化材は、高炉水砕スラグ
（新日鐵化学社製エスメントスーパー１００Ｐ）／シリ
カヒューム（日本重化学工業社製）／ウオラストナイト
（ナイコ社製）／消石灰=６.４／０.８／０.８／２（重
量比）のものを使用した。また分散液は、アクリル酸マ
レイン酸共重合物（９：１）のナトリウム塩を使用し、
硬化液は、２５％ ＮａＯＨ溶液を使用した。The compositions of the solidifying material, the dispersion and the curing liquid used in the present embodiment are shown below. The solidified material is granulated blast furnace slag (Esment Super 100P manufactured by Nippon Steel Chemical Co., Ltd.) / Silica fume (manufactured by Nippon Heavy Chemical Industry Co., Ltd.) / Wollastonite (manufactured by Nyco) / slaked lime = 6.4 / 0.8 / 0.8 / 2 (weight ratio) was used. In addition, the dispersion uses a sodium salt of an acrylic acid-maleic acid copolymer (9: 1),
As the curing liquid, a 25% NaOH solution was used.
【００１９】（実施例１）丸菱機械社製モルタルミキサ
ーに、水，塩化ストロンチウム６水和物，硫酸ナトリウ
ム（無水中性芒硝）を投入し、さらに分散液，スラグセ
メント，硬化液を投入して混練した。配合仕様を表２
に、評価結果を表３に示す。この時の硫酸ナトリウムの
充填率は４０ｗｔ％、塩化ストロンチウムの添加率は硫
酸ナトリウムに対し９.４ｍｏｌ％であった。(Example 1) Water, strontium chloride hexahydrate, and sodium sulfate (anhydrous anhydrous sodium sulfate) were charged into a mortar mixer manufactured by Marubishi Machine Co., Ltd., and further a dispersion, slag cement, and a hardening liquid were charged. And kneaded. Table 2 shows the formulation specifications
Table 3 shows the evaluation results. At this time, the filling rate of sodium sulfate was 40 wt%, and the addition rate of strontium chloride was 9.4 mol% based on sodium sulfate.
【００２０】[0020]
【表２】 [Table 2]
【００２１】[0021]
【表３】 [Table 3]
【００２２】得られた固化体の圧縮強度は２００ｋｇ／
ｃｍ2で、目標値（１００ｋｇ／ｃｍ2以上）を満たし、
また耐水性能においては、４週間の水への浸漬後も外観
に変化はなく、良好な結果が得られた。The compression strength of the obtained solidified material is 200 kg /
cm 2 , satisfy the target value (100 kg / cm 2 or more)
In addition, in the water resistance performance, there was no change in appearance even after immersion in water for 4 weeks, and good results were obtained.
【００２３】（実施例２）丸菱機械社製モルタルミキサ
ーに、水，塩化ストロンチウム６水和物，硫酸ナトリウ
ム（無水中性芒硝）を投入し、さらに分散液，スラグセ
メント，硬化液を投入して混練した。配合仕様を表４
に、評価結果を表５に示す。この時の硫酸ナトリウムの
充填率は５０ｗｔ％、塩化ストロンチウム６水和物の添
加率は硫酸ナトリウムに対し９.４ｍｏｌ％であった。Example 2 Water, strontium chloride hexahydrate, and sodium sulfate (anhydrous neutral sodium sulfate) were charged into a mortar mixer manufactured by Marubishi Machine Co., Ltd., and further a dispersion, slag cement, and a curing liquid were charged. And kneaded. Table 4 shows the formulation specifications
Table 5 shows the evaluation results. At this time, the filling rate of sodium sulfate was 50 wt%, and the addition rate of strontium chloride hexahydrate was 9.4 mol% based on sodium sulfate.
【００２４】[0024]
【表４】 [Table 4]
【００２５】[0025]
【表５】 [Table 5]
【００２６】得られた固化体の圧縮強度は１５２ｋｇ／
ｃｍ2で、目標値（１００ｋｇ／ｃｍ2以上）を満たし、
また耐水性能においては、４週間の水への浸漬後も外観
に変化はなく、良好な結果が得られた。The compressive strength of the obtained solid is 152 kg /
cm 2 , satisfy the target value (100 kg / cm 2 or more)
In addition, in the water resistance performance, there was no change in appearance even after immersion in water for 4 weeks, and good results were obtained.
【００２７】（実施例３）丸菱機械社製モルタルミキサ
ーに、水，硝酸ストロンチウム，硫酸ナトリウム（無水
中性芒硝）を投入し、さらに分散液，スラグセメント，
硬化液を投入して混練した。配合仕様を表６に、評価結
果を表７に示す。この時の硫酸ナトリウム充填率は５０
ｗｔ％、硝酸ストロンチウムの添加率は硫酸ナトリウム
に対し１１.８ｍｏｌ％であった。(Example 3) Water, strontium nitrate, and sodium sulfate (anhydrous anhydrous sodium sulfate) were charged into a mortar mixer manufactured by Marubishi Machinery Co., Ltd., and a dispersion, slag cement,
The curing liquid was charged and kneaded. Table 6 shows the formulation specifications, and Table 7 shows the evaluation results. The filling rate of sodium sulfate at this time is 50
wt% and the addition rate of strontium nitrate were 11.8 mol% with respect to sodium sulfate.
【００２８】[0028]
【表６】 [Table 6]
【００２９】[0029]
【表７】 [Table 7]
【００３０】得られた固化体の圧縮強度は１４０ｋｇ／
ｃｍ2で、目標値（１００ｋｇ／ｃｍ2以上）を満たし、
また耐水性能においては、４週間の水への浸漬後も外観
に変化はなく、良好な結果が得られた。The compressive strength of the obtained solid is 140 kg /
cm 2 , satisfy the target value (100 kg / cm 2 or more)
In addition, in the water resistance performance, there was no change in appearance even after immersion in water for 4 weeks, and good results were obtained.
【００３１】（実施例４）丸菱機械社製モルタルミキサ
ーに、水，硝酸ストロンチウム，硫酸ナトリウム（無水
中性芒硝）を投入し、さらに分散液，スラグセメント，
硬化液を投入して混練した。配合仕様を表８に、評価結
果を表９に示す。この時の硫酸ナトリウム充填率は５０
ｗｔ％、硝酸ストロンチウムの添加率は硫酸ナトリウム
に対し７.５ｍｏｌ％であった。Example 4 Water, strontium nitrate, and sodium sulfate (anhydrous anhydrous sodium sulfate) were charged into a mortar mixer manufactured by Marubishi Machinery Co., Ltd., and a dispersion, slag cement,
The curing liquid was charged and kneaded. Table 8 shows the formulation specifications, and Table 9 shows the evaluation results. The filling rate of sodium sulfate at this time is 50
wt%, the addition rate of strontium nitrate was 7.5 mol% with respect to sodium sulfate.
【００３２】[0032]
【表８】 [Table 8]
【００３３】[0033]
【表９】 [Table 9]
【００３４】得られた固化体の圧縮強度は１５５ｋｇ／
ｃｍ2で、目標値（１００ｋｇ／ｃｍ2以）を満たし、ま
た耐水性能においては、４週間の水への浸漬後も外観に
変化はなく、良好な結果が得られた。The compressive strength of the obtained solid was 155 kg /
cm 2 , the target value (100 kg / cm 2 or less) was satisfied, and in water resistance performance, there was no change in appearance even after immersion in water for 4 weeks, and good results were obtained.
【００３５】（実施例５）丸菱機械社製モルタルミキサ
ーに、水，硝酸バリウム，硫酸ナトリウム（無水中性芒
硝）を投入し、さらに分散液，スラグセメント，硬化液
を投入して混練した。配合仕様を表１０に、評価結果を
表１１に示す。この時の硫酸ナトリウム充填率は５０ｗ
ｔ％、硝酸バリウムの添加率は硫酸ナトリウムに対し
６.０ｍｏｌ％であった。Example 5 Water, barium nitrate, and sodium sulfate (anhydrous anhydrous sodium sulfate) were charged into a mortar mixer manufactured by Marubishi Machine Co., Ltd., and a dispersion, slag cement, and a curing liquid were further charged and kneaded. Table 10 shows the formulation specifications, and Table 11 shows the evaluation results. At this time, the filling rate of sodium sulfate is 50w
The addition rate of barium nitrate was 6.0 mol% with respect to sodium sulfate.
【００３６】[0036]
【表１０】 [Table 10]
【００３７】[0037]
【表１１】 [Table 11]
【００３８】得られた固化体の圧縮強度は１７０ｋｇ／
ｃｍ2で、目標値（１００ｋｇ／ｃｍ2以上）を満たし、
また耐水性能においては、４週間の水への浸漬後も外観
に変化はなく、良好な結果が得られた。The compressive strength of the obtained solid was 170 kg /
cm 2 , satisfy the target value (100 kg / cm 2 or more)
In addition, in the water resistance performance, there was no change in appearance even after immersion in water for 4 weeks, and good results were obtained.
【００３９】（実施例６）丸菱機械社製モルタルミキサ
ーに、水，塩化バリウム２水和物，硫酸ナトリウム（無
水中性芒硝）を投入し、さらに分散液，スラグセメン
ト，硬化液を投入して混練した。配合仕様を表１２に、
評価結果を表１３に示す。この時の硫酸ナトリウム充填
率は５０ｗｔ％、塩化バリウム２水和物の添加率は硫酸
ナトリウムに対し７.６ｍｏｌ％であった。Example 6 Water, barium chloride dihydrate and sodium sulfate (anhydrous neutral sodium sulfate) were charged into a mortar mixer manufactured by Marubishi Machine Co., Ltd., and a dispersion, slag cement and a hardening liquid were further charged. And kneaded. Table 12 shows the formulation specifications.
Table 13 shows the evaluation results. At this time, the filling rate of sodium sulfate was 50 wt%, and the adding rate of barium chloride dihydrate was 7.6 mol% based on sodium sulfate.
【００４０】[0040]
【表１２】 [Table 12]
【００４１】[0041]
【表１３】 [Table 13]
【００４２】得られた固化体の圧縮強度は１３５ｋｇ／
ｃｍ2で、目標値（１００ｋｇ／ｃｍ2以上）を満たし、
また耐水性能においては、４週間の水への浸漬後も外観
に変化はなく、良好な結果が得られた。The compressive strength of the obtained solid was 135 kg /
cm 2 , satisfy the target value (100 kg / cm 2 or more)
In addition, in the water resistance performance, there was no change in appearance even after immersion in water for 4 weeks, and good results were obtained.
【００４３】（比較例１）丸菱機械社製モルタルミキサ
ーに、塩類を加えず、水，硫酸ナトリウム（無水中性芒
硝）を投入し、さらに分散液，スラグセメント，硬化液
を投入して混練した。配合仕様を表１４に、評価結果を
表１５に示す。この時の硫酸ナトリウム充填率は５０ｗ
ｔ％であった。(Comparative Example 1) Water and sodium sulfate (anhydrous neutral sodium sulfate) were added to a mortar mixer manufactured by Marubishi Machinery Co., Ltd. without adding salts, and further, a dispersion, slag cement, and a curing liquid were added and kneaded. did. Table 14 shows the formulation specifications, and Table 15 shows the evaluation results. At this time, the filling rate of sodium sulfate is 50w
t%.
【００４４】[0044]
【表１４】 [Table 14]
【００４５】[0045]
【表１５】 [Table 15]
【００４６】得られた固化体の圧縮強度は３２８ｋｇ／
ｃｍ2で、目標値（１００ｋｇ／ｃｍ2以上）を満たして
いた。しかしながら、耐水性能においては、水に浸漬後
２日でひび割れが発生した。The compressive strength of the obtained solid was 328 kg /
cm 2 , the target value (100 kg / cm 2 or more) was satisfied. However, in water resistance, cracks occurred two days after immersion in water.
【００４７】[0047]
【発明の効果】耐水性向上剤としてアルカリ土類金属塩
を添加し、該アルカリ土類金属塩と硫酸ナトリウムを反
応させて不溶性で安定な物質を生成させることにより、
硫酸ナトリウムの含水塩化による膨潤・ひび割れを防ぐ
ことができ、良好な物性を有する固化体を得ることがで
きる。さらに硫酸ナトリウムに対する反応生成物の容積
比が小さいアルカリ土類金属塩を選択する事により、よ
り安定な固化体を得ることができる。これにより、硫酸
ナトリウム含有放射性廃液の高充填セメント固化処理が
可能となる。According to the present invention, an alkaline earth metal salt is added as a water resistance improver, and the alkaline earth metal salt is reacted with sodium sulfate to form an insoluble and stable substance.
Swelling and cracking due to hydrous chloride of sodium sulfate can be prevented, and a solid having good physical properties can be obtained. Further, by selecting an alkaline earth metal salt having a small volume ratio of the reaction product to sodium sulfate, a more stable solid can be obtained. This makes it possible to solidify the sodium sulphate-containing radioactive liquid waste with high filling cement.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 鈴木 和則 茨城県東茨城郡大洗町成田町2205番地 日 揮株式会社大洗原子力技術開発センター内 (72)発明者 三原 茂 茨城県東茨城郡大洗町成田町2205番地 日 揮株式会社大洗原子力技術開発センター内 (72)発明者 唐沢 義光 群馬県藤岡市本郷903−61 (72)発明者 田邊 義博 群馬県高崎市岩鼻町239 Ｅ−15 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Kazunori Suzuki 2205 Narita-cho, Oarai-machi, Higashiibaraki-gun, Ibaraki Japan JGC Corporation Oarai Nuclear Technology Development Center (72) Inventor Shigeru Mihara Narita, Oarai-cho, Higashiibaraki-gun, Ibaraki 2205-cho JGC Corporation Oarai Nuclear Technology Development Center (72) Inventor Yoshimitsu Karasawa 903-61 Hongo, Fujioka City, Gunma Prefecture (72) Inventor Yoshihiro Tanabe 239 Iwana-cho, Takasaki City, Gunma Prefecture E-15
Claims (7)
及び硬化刺激剤を原料として有することを特徴とする硫
酸ナトリウム含有放射性廃液固化用材。1. Granulated blast furnace slag, alkaline earth metal salt,
And a curing stimulant as a raw material.
末，及び分散剤から選ばれる１種以上を原料として有す
ることを特徴とする請求項１記載の硫酸ナトリウム含有
放射性廃液固化用材。2. The material for solidifying a sodium sulphate-containing radioactive waste liquid according to claim 1, further comprising, as a raw material, at least one selected from a curing regulator, a fine powder, an acicular inorganic powder, and a dispersant.
ム，硝酸バリウム，塩化ストロンチウム，及び硝酸スト
ロンチウムから選ばれる１種以上であることを特徴とす
る請求項１又は２記載の硫酸ナトリウム含有放射性廃液
固化用材。3. The solidification of a sodium sulfate-containing radioactive waste liquid according to claim 1, wherein the alkaline earth metal salt is at least one selected from barium chloride, barium nitrate, strontium chloride, and strontium nitrate. Lumber.
リ土類金属塩とを混合して加熱濃縮する混合・加熱濃縮
工程と、高炉水砕スラグ及び硬化刺激剤を含有する固化
材と前記混合・加熱濃縮工程で得られた加熱濃縮物とを
混練する混練工程と、該混練工程で得られた混練物を養
生固化する養生固化工程を有することを特徴とする硫酸
ナトリウム含有放射性廃液の固化処理方法。4. A mixing / heating / concentrating step of mixing and heating and concentrating a radioactive waste liquid containing sodium sulfate and an alkaline earth metal salt, and a mixing / heating / concentrating step with a solidified material containing granulated blast furnace slag and a hardening stimulant. A method for solidifying a sodium sulfate-containing radioactive waste liquid, comprising: a kneading step of kneading the heated concentrate obtained in the step; and a curing and solidifying step of curing and solidifying the kneaded product obtained in the kneading step.
記高炉水砕スラグ及び前記硬化刺激剤に加えて、更に硬
化調整剤，微粉，針状無機質粉末，及び分散剤から選ば
れる１種以上を含有する固化材とすることを特徴とする
請求項４記載の硫酸ナトリウム含有廃液の固化処理方
法。5. In addition to the granulated blast furnace slag and the hardening stimulant, the solidified material used in the kneading step is one or more selected from a hardening modifier, a fine powder, a needle-like inorganic powder, and a dispersant. The method for solidifying sodium sulphate-containing waste liquid according to claim 4, wherein the solidification material comprises:
リウム，硝酸バリウム，塩化ストロンチウム，及び硝酸
ストロンチウムから選ばれる１種以上を用いることを特
徴とする請求項４又は５記載の硫酸ナトリウム含有放射
性廃液の固化処理方法。6. The radioactive waste liquid containing sodium sulfate according to claim 4, wherein at least one selected from the group consisting of barium chloride, barium nitrate, strontium chloride, and strontium nitrate is used as the alkaline earth metal salt. Solidification treatment method.
リウム含有放射性廃液と混合する前記アルカリ土類金属
塩の量を、前記硫酸ナトリウム含有放射性廃液に含まれ
る硫酸ナトリウムに対して１〜１００ｍｏｌ％とするこ
とを特徴とする請求項４ないし６いずれか１記載の硫酸
ナトリウム含有放射性廃液の固化処理方法。7. The amount of the alkaline earth metal salt to be mixed with the sodium sulfate-containing radioactive waste liquid in the mixing / heating concentration step is 1 to 100 mol% based on sodium sulfate contained in the sodium sulfate-containing radioactive waste liquid. The method for solidifying a sodium sulphate-containing radioactive liquid waste according to any one of claims 4 to 6, wherein:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31559197A JPH11148998A (en) | 1997-11-17 | 1997-11-17 | Solidification material for radioactive waste liquid containing sodium sulfate and solidification processing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31559197A JPH11148998A (en) | 1997-11-17 | 1997-11-17 | Solidification material for radioactive waste liquid containing sodium sulfate and solidification processing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11148998A true JPH11148998A (en) | 1999-06-02 |
Family
ID=18067205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31559197A Withdrawn JPH11148998A (en) | 1997-11-17 | 1997-11-17 | Solidification material for radioactive waste liquid containing sodium sulfate and solidification processing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11148998A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007003393A (en) * | 2005-06-24 | 2007-01-11 | Hitachi Ltd | Solidification disposal method for radioactive waste |
-
1997
- 1997-11-17 JP JP31559197A patent/JPH11148998A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007003393A (en) * | 2005-06-24 | 2007-01-11 | Hitachi Ltd | Solidification disposal method for radioactive waste |
| JP4603941B2 (en) * | 2005-06-24 | 2010-12-22 | 株式会社日立製作所 | Solidification method for radioactive waste |
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