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JP2005112706A - Hexavalent chromium component elution suppression material and hexavalent chromium component elution suppression method using the elution suppression material. - Google Patents

Hexavalent chromium component elution suppression material and hexavalent chromium component elution suppression method using the elution suppression material. Download PDF

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JP2005112706A
JP2005112706A JP2003380524A JP2003380524A JP2005112706A JP 2005112706 A JP2005112706 A JP 2005112706A JP 2003380524 A JP2003380524 A JP 2003380524A JP 2003380524 A JP2003380524 A JP 2003380524A JP 2005112706 A JP2005112706 A JP 2005112706A
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Junsuke Haruna
淳介 春名
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TAIYOO ENGINEERING KK
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Abstract

【課題】地盤強化等に用いられるセメントから六価クロムが溶出するのを、これまで以上により確実に抑制出来るようにすること。
【解決手段】亜硫酸ソーダ、重亜硫酸ソーダ又は亜硫酸カルシウムの粉末或いは水溶液と人工ゼオライトとを用い、これらをセメントに添加してセメントから六価クロ厶成分が溶出するのを抑制するようにした。
[PROBLEMS] To more reliably suppress the elution of hexavalent chromium from cement used for ground reinforcement or the like.
SOLUTION: A powder or aqueous solution of sodium sulfite, sodium bisulfite or calcium sulfite and an artificial zeolite are used, and these are added to the cement to suppress the elution of the hexavalent black koji component from the cement.

Description

本発明は、軟弱地盤強化等に用いるセメントに添加して、セメントから六価クロムが溶出するのを抑制する溶出抑制材と該抑制材を用いた六価クロム成分の溶出抑制方法に関する。  The present invention relates to an elution inhibitor that suppresses elution of hexavalent chromium from cement, which is added to cement used for soft ground reinforcement, and a method for inhibiting elution of a hexavalent chromium component using the inhibitor.

技術背景Technical background

軟弱地盤の強化を図るのに一般にセメントが用いられるが、このセメントには六価クロム成分を直接含有する場合がある。これが溶出することで公害発生を招く原因となっており、更に、セメントには、数百ppm以上の六価クロム成分の予備軍である三価クロム成分が含有されており、これが酸化されて六価クロム成分に変化し、溶出するという危険性もある。  Cement is generally used to strengthen soft ground, but this cement may contain a hexavalent chromium component directly. This is a cause of pollution due to elution, and the cement contains a trivalent chromium component that is a reserve of hexavalent chromium component of several hundred ppm or more, and this is oxidized to six. There is also a danger of changing to a valent chromium component and elution.

これまで、セメントから六価クロム成分の溶出を防止できないとされてきたが、こうした六価クロム成分の溶出防止の問題意識は高く、種々の対策案が提案されている。
特開平1−92193(六価クロム溶出抑制セメント)には、塩化バリウムをセメントに添加し、セメントに含有された六価クロムを溶出を抑制しようとする考えが提案されている。 特開平10−235316(六価クロム溶出防止方法)には、上記の塩化バリウムをカプセルに入れてセメントと共に六価クロム含有物に加える方法が提案されている。 尚、このような塩化バリウムの他に、塩化第一鉄のような還元材を添加、使用する方法も提案されている。しかし、これはセメントの硬化を抑制するという欠点がある。
Up until now, it has been said that elution of hexavalent chromium components from cement cannot be prevented, but awareness of the problem of preventing elution of such hexavalent chromium components is high, and various countermeasures have been proposed.
JP-A-1-92193 (hexavalent chromium elution suppression cement) proposes an idea of adding barium chloride to cement and suppressing elution of hexavalent chromium contained in the cement. Japanese Patent Laid-Open No. 10-235316 (Method for preventing elution of hexavalent chromium) proposes a method in which the above barium chloride is put in a capsule and added to a hexavalent chromium-containing material together with cement. In addition to such barium chloride, a method of adding and using a reducing material such as ferrous chloride has also been proposed. However, this has the disadvantage of suppressing cement hardening.

しかし、何れの場合も、セメントから直接溶出した六価クロム成分を還元させるか、或いは溶出した三価クロム成分が酸化して六価クロム成分となるのを還元させるという考えはあるものの、還元された三価クロム成分或いはセメントから直接溶出した三価クロム成分が再度六価クロム成分に酸化されるのを防止しようという考え方は採られてきておらず、この対策が求められていた。  However, in any case, although there is an idea that the hexavalent chromium component eluted directly from the cement is reduced or the eluted trivalent chromium component is oxidized and reduced to a hexavalent chromium component, it is reduced. The idea of preventing the trivalent chromium component or the trivalent chromium component eluted directly from the cement from being oxidized again to the hexavalent chromium component has not been taken, and this countermeasure has been demanded.

本発明は、地盤強化等に用いられるセメントから六価クロムが溶出するのを、これまで以上により確実に抑制することの出来る六価クロム成分の溶出抑制材と該溶出抑制材を用いた六価クロム成分の溶出抑制方法を提供することを目的とする。  The present invention relates to an elution inhibitor of a hexavalent chromium component capable of more reliably suppressing elution of hexavalent chromium from cement used for ground reinforcement and the like, and a hexavalent using the elution inhibitor. It aims at providing the elution suppression method of a chromium component.

本発明にかかる六価クロム成分の溶出抑制材は、上記目的を達成するために、セメントに添加してセメントから六価クロム成分が溶出するのを抑制するための溶出抑制材であって、
亜硫酸ソーダ水溶液、重亜硫酸ソーダ水溶液又は亜硫酸カルシウム水溶液の何れか一つを含浸させた人工ゼオライトからなる、ことを特徴とする。
The hexavalent chromium component elution suppressing material according to the present invention is an elution suppressing material for suppressing the elution of the hexavalent chromium component from the cement added to the cement in order to achieve the above-described object,
It consists of artificial zeolite impregnated with any one of sodium sulfite aqueous solution, sodium bisulfite aqueous solution and calcium sulfite aqueous solution.

また、本発明にかかる六価クロム成分の溶出抑制材は、上記目的を達成するために、セメントに添加してセメントから六価クロム成分が溶出するのを抑制するための溶出抑制材であって、
亜硫酸ソーダ粉末、重亜硫酸ソーダ粉末又は亜硫酸カルシウム粉末の何れか一つと人工ゼオライト粉末とを混合させてなる、ことを特徴とする。
In addition, the hexavalent chromium component elution suppressing material according to the present invention is an elution suppressing material for suppressing the elution of the hexavalent chromium component from the cement by adding it to the cement in order to achieve the above object. ,
It is characterized by mixing any one of sodium sulfite powder, sodium bisulfite powder or calcium sulfite powder and artificial zeolite powder.

また、本発明にかかる六価クロム成分の溶出抑制方法は、上記目的を達成するために、
上記の溶出抑制材を、セメントに対して重量比で1〜10%添加し、軟弱地盤のヘドロと混合して地盤強化を図り、強化地盤のセメントから六価クロム成分が溶出するのを抑制する、ことを特徴とする。
Further, the elution suppression method of the hexavalent chromium component according to the present invention achieves the above-mentioned object,
Add 1-10% by weight of the above elution inhibitor to the cement, mix with sludge of soft ground to strengthen the ground, and suppress the elution of hexavalent chromium components from the cement of the reinforced ground It is characterized by that.

本発明の効果は、セメントから溶出した六価クロ厶成分の3価クロム成分への還元作用(2Cr6++3SO 3−→2Cr3++3SO 2−)のみならず、ゼオライトによる吸着機能によって3価クロム成分及び還元された3価クロム成分を留め置き(Cr3++Ze−Na→Na+(Ze)Cr)、以って、三価クロム成分が再度六価クロム成分に酸化されるのを防止することが出来るに至ったものであり、これにより、セメントの強度発現を劣化させずに、即ち、系をアルカリ状態に保ちつつ、結果としてセメント(強化地盤等)から有害な六価クロムが溶出するのを大幅に抑制することが出来る点にある。
本発明にかかるその他の具体的な効果は、本発明の
The effect of the present invention is not only due to the reduction action (2Cr 6+ + 3SO 3 3− → 2Cr 3+ + 3SO 4 2− ) of the hexavalent chromium component eluted from the cement to the trivalent chromium component, but also by the adsorption function by zeolite. The chromium component and the reduced trivalent chromium component are retained (Cr 3+ + Ze-Na → Na + + (Ze) a Cr), thereby preventing the trivalent chromium component from being oxidized again to the hexavalent chromium component. As a result, harmful hexavalent chromium is eluted from the cement (reinforced ground, etc.) without deteriorating the strength of the cement, that is, while maintaining the system in an alkaline state. It is in the point which can be suppressed significantly.
Other specific effects according to the present invention are as follows.

及びas well as

に記載されている通りである。As described in.

上記の亜硫酸ソーダ水溶液、重亜硫酸ソーダ水溶液又は亜硫酸カルシウム水溶液の何れか一つを含浸させた人工ゼオライトからなる本発明においては、前記亜硫酸ソーダ水溶液、重亜硫酸ソーダ水溶液又は亜硫酸カルシウム水溶液の濃度が、10%〜30%であるのが好ましい。
このような濃度であれば、人工ゼオライトの微細孔へのより確実な浸透と、微細孔での効率の良い付着が期待出来て、その後のセメントから溶出した三価クロム乃至六価クロムに対する効率のよい還元作用が期待出来る。
In the present invention comprising an artificial zeolite impregnated with any one of the above-mentioned sodium sulfite aqueous solution, sodium bisulfite aqueous solution or calcium sulfite aqueous solution, the concentration of the sodium sulfite aqueous solution, sodium bisulfite aqueous solution or calcium sulfite aqueous solution is 10 % To 30% is preferred.
With such a concentration, more reliable penetration of the artificial zeolite into the micropores and efficient adhesion in the micropores can be expected, and the efficiency of trivalent chromium to hexavalent chromium eluted from the cement after that can be improved. Good reduction action can be expected.

また、上記亜硫酸ソーダ粉末、重亜硫酸ソーダ粉末又は亜硫酸カルシウム粉末の何れか一つと人工ゼオライト粉末とを混合させてなる本発明においては、前記人工ゼオライト粉末に対して前記亜硫酸ソーダ粉末、重亜硫酸ソーダ粉末又は亜硫酸カルシウム粉末が、重量比で5%〜15%混合されているのが好ましい。
このような重量比の混合状態を採ることで、コストを最小限に抑えながら、セメントから溶出した三価クロ厶乃至六価クロ厶に対する効率のよい還元作用を行ない得る。
Further, in the present invention in which any one of the sodium sulfite powder, sodium bisulfite powder or calcium sulfite powder is mixed with artificial zeolite powder, the sodium sulfite powder and sodium bisulfite powder are mixed with the artificial zeolite powder. Or it is preferable that 5%-15% of calcium sulfite powder is mixed by weight ratio.
By adopting such a mixed state of the weight ratio, it is possible to perform an efficient reducing action on trivalent or hexavalent chromium eluted from the cement while minimizing the cost.

また、本発明において用いる人工ゼオライトは、Ca−Typeのゼオライト、Na−Typeのゼオライトが用いられるが、人工ゼオライト自体については、既に公知の種々の原料及び方法で製造されたものであればよく、従って、この人工ゼオライト自体のタイプ乃至原料、製造方法についての詳細説明を省くが、低コストで製造できるものであれば、本発明に適用するに際して依り一層コストダウンを図ることができるものである。  In addition, as the artificial zeolite used in the present invention, Ca-Type zeolite and Na-Type zeolite are used, but the artificial zeolite itself may be any one that has already been produced by various known raw materials and methods, Therefore, the detailed description of the type or raw material of the artificial zeolite itself, and the production method is omitted, but if it can be produced at low cost, the cost can be further reduced when applied to the present invention.

ここでは、溶出抑制材−Bとして、Na−Typeの人工ゼオライト粉末と重亜硫酸ソーダ粉末とを、重量比で9対1の割合で混合したものを準備した。この溶出抑制材−Bをセメントに対して、重量比で1%、5%、10%の割合で添加し、これを軟弱地盤に対して撒布してヘドロと混合し、その地盤強化を図ることとした。  Here, as the elution inhibitor-B, a mixture of Na-Type artificial zeolite powder and sodium bisulfite powder at a weight ratio of 9 to 1 was prepared. This dissolution inhibitor-B is added to cement at a ratio of 1%, 5%, and 10% by weight, and this is spread on soft ground and mixed with sludge to strengthen the ground. It was.

その後、対象軟弱地盤について、セメント100%のみによる対象軟弱地盤と比較するべく、六価クロム成分の溶出濃度及び全クロム成分の溶出濃度を測定した結果は次ぎの通りであった。

Figure 2005112706
Thereafter, the results of measuring the elution concentration of the hexavalent chromium component and the elution concentration of all the chromium components in order to compare the target soft ground with the target soft ground made of only 100% cement were as follows.
Figure 2005112706

ここでは、溶出抑制材−Cとして、Na−Typeの人工ゼオライト粉末と亜硫酸カルシウム粉末とを、重量比で9対1の割合で混合したものを準備した。この溶出抑制材−Cをセメントに対して、重量比で1%、5%、10%の割合で添加し、これを軟弱地盤に対して撒布してヘドロと混合し、その地盤強化を図ることとした。  Here, an elution inhibitor-C prepared by mixing Na-Type artificial zeolite powder and calcium sulfite powder at a weight ratio of 9 to 1 was prepared. This dissolution inhibitor-C is added to cement at a ratio of 1%, 5%, and 10% by weight, and this is distributed to soft ground and mixed with sludge to strengthen the ground. It was.

その後、対象軟弱地盤について、セメント100%のみによる対象軟弱地盤と比較するべく、六価クロム成分の溶出濃度及び全クロ厶成分の溶出濃度を測定した結果は次ぎの通りであった。

Figure 2005112706
Thereafter, the results of measuring the elution concentration of the hexavalent chromium component and the elution concentration of all the black koji components were as follows for the subject soft ground to be compared with the subject soft ground with only 100% cement.
Figure 2005112706

上記の各実施例から、使用する人工ゼオライトとしては、Na−Typeのものが良好な溶出抑制効果をもたらすことが分かった。
そして、溶出抑制材がセメントに対して10%使用されれば、100%セメントのみの場合と比べて、六価クロム溶出が約1/50、全クロムの溶出が1/4程度に抑制出来ることが分かった。
From each of the above examples, it was found that the artificial zeolite used had Na-Type having a good elution suppressing effect.
And if the elution inhibitor is used 10% of cement, compared to the case of 100% cement alone, hexavalent chromium elution can be suppressed to about 1/50 and total chromium elution can be suppressed to about 1/4. I understood.

本発明の活用例として、軟弱地盤の強化に用いるセメントの他、一般家屋、建物、その他、水はけが求められるコンクリート打ちのフロア−、床、その他、常時水に晒されるタイル張の場所が予定されるコンクリート構築物に利用し、六価クロムの地下への溶出を極力抑制することが求められるところに応用できる。  As examples of utilization of the present invention, in addition to cement used for strengthening soft ground, general houses, buildings, etc., concrete floors that require drainage, floors, and other tiled places that are constantly exposed to water are planned. It can be applied to places where it is required to suppress the elution of hexavalent chromium to the underground as much as possible.

Claims (5)

セメントに添加してセメントから六価クロム成分が溶出するのを抑制するための溶出抑制材であって、
亜硫酸ソーダ水溶液、重亜硫酸ソーダ水溶液又は亜硫酸カルシウム水溶液の何れか一つを含浸させた人工ゼオライトからなる六価クロム成分の溶出抑制材。
An elution inhibitor for suppressing the elution of the hexavalent chromium component from the cement when added to the cement,
A hexavalent chromium component elution inhibitor comprising an artificial zeolite impregnated with any one of a sodium sulfite aqueous solution, a sodium bisulfite aqueous solution and a calcium sulfite aqueous solution.
前記亜硫酸ソーダ水溶液、重亜硫酸ソーダ水溶液又は亜硫酸カルシウム水溶液の濃度が、10%〜30%である、請求項1の六価クロム成分の溶出抑制材。  The hexavalent chromium component elution suppressing material according to claim 1, wherein the concentration of the sodium sulfite aqueous solution, the sodium bisulfite aqueous solution or the calcium sulfite aqueous solution is 10% to 30%. セメントに添加してセメントから六価クロム成分が溶出するのを抑制するための溶出抑制材であって、
亜硫酸ソーダ粉末、重亜硫酸ソーダ粉末又は亜硫酸カルシウム粉末の何れか一つと人工ゼオライト粉末とを混合させてなる、六価クロム成分の溶出抑制材。
An elution inhibitor for suppressing the elution of the hexavalent chromium component from the cement when added to the cement,
An elution inhibitor for hexavalent chromium components, comprising any one of sodium sulfite powder, sodium bisulfite powder, and calcium sulfite powder mixed with artificial zeolite powder.
前記人工ゼオライト粉末に対して前記亜硫酸ソーダ粉末、重亜硫酸ソーダ粉末又は亜硫酸カルシウ厶粉末が、重量比で5%〜15%混合されている、請求項3の六価クロム成分の溶出抑制材。  The hexavalent chromium component elution suppressing material according to claim 3, wherein the sodium sulfite powder, the sodium bisulfite powder or the calcium sulfite powder is mixed by 5 to 15% by weight with respect to the artificial zeolite powder. 請求項1乃至請求項4の溶出抑制材を、セメントに対して重量比で1〜10%添加し、軟弱地盤のヘドロと混合して地盤強化を図り、強化地盤のセメントから六価クロム成分が溶出するのを抑制する、六価クロム成分の溶出抑制方法。  Add 1 to 10% by weight of the elution inhibitor of claim 1 to claim 4 with respect to the cement, mix with the sludge of the soft ground to strengthen the ground, and the hexavalent chromium component from the cement of the reinforced ground A method for suppressing elution of a hexavalent chromium component, which suppresses elution.
JP2003380524A 2003-10-04 2003-10-04 Hexavalent chromium component elution suppression material and hexavalent chromium component elution suppression method using the elution suppression material. Pending JP2005112706A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2426514A (en) * 2005-05-24 2006-11-29 William Blythe Ltd Chromium VI reduced cements
JP2009074771A (en) * 2007-09-21 2009-04-09 Chugoku Electric Power Co Inc:The Coal fired power generation system and method of reducing elution of hexavalent chromium

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2426514A (en) * 2005-05-24 2006-11-29 William Blythe Ltd Chromium VI reduced cements
JP2009074771A (en) * 2007-09-21 2009-04-09 Chugoku Electric Power Co Inc:The Coal fired power generation system and method of reducing elution of hexavalent chromium

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