JP2002166247A - Heavy metal elusion inhibitor and method for treating fly ash therewith - Google Patents
Heavy metal elusion inhibitor and method for treating fly ash therewithInfo
- Publication number
- JP2002166247A JP2002166247A JP2001274699A JP2001274699A JP2002166247A JP 2002166247 A JP2002166247 A JP 2002166247A JP 2001274699 A JP2001274699 A JP 2001274699A JP 2001274699 A JP2001274699 A JP 2001274699A JP 2002166247 A JP2002166247 A JP 2002166247A
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- Prior art keywords
- chelating agent
- fly ash
- heavy metal
- liquid
- inhibitor
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ごみ焼却炉等の各
種焼却炉から排出される飛灰及び焼却灰（以下、これら
を併せて「焼却飛灰」と称する）の処理において用いる
薬液の調整に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the preparation of chemicals used in the treatment of fly ash and incinerated ash discharged from various incinerators such as refuse incinerators (hereinafter collectively referred to as "incinerated fly ash"). About.
【０００２】[0002]
【従来の技術】ごみ焼却炉等の焼却炉から排出される焼
却飛灰には、鉛、カドミウム、クロム、水銀、亜鉛、銅
等の人体に有害な重金属類が高濃度に含有されている。
これらは雨水等の環境水と接触すると溶出を起こし、土
壌や地下水、河川、海水等を汚染する。したがって、焼
却飛灰からのこれらの重金属類の溶出を防止することが
必要である。2. Description of the Related Art Incineration fly ash discharged from incinerators such as refuse incinerators contains heavy metals such as lead, cadmium, chromium, mercury, zinc and copper which are harmful to human bodies in high concentrations.
When they come into contact with environmental water such as rainwater, they elute and contaminate soil, groundwater, rivers, seawater, and the like. Therefore, it is necessary to prevent the elution of these heavy metals from incineration fly ash.
【０００３】従来、焼却炉から排出される焼却飛灰中の
重金属類の処理方法として、焼却飛灰をジチオカルバミ
ン酸塩などの液体キレート剤で処理する方法が採用され
ている。このような液体キレート剤による焼却飛灰の処
理は、上水やプラント内再利用水（工程水）によって液
体キレート剤を所定の濃度に希釈して、このキレート剤
希釈液を混練処理機に導き、そこで焼却飛灰と混練する
ことによって行われる。この処理により、重金属類がキ
レート剤と反応して水に不溶性の化合物を生成すること
によって、重金属類の溶出が防止される。Conventionally, as a method of treating heavy metals in incineration fly ash discharged from an incinerator, a method of treating incineration fly ash with a liquid chelating agent such as dithiocarbamate has been adopted. The treatment of incineration fly ash with such a liquid chelating agent involves diluting the liquid chelating agent to a predetermined concentration with tap water or reused water (process water) in a plant, and guiding the diluted chelating agent to a kneading treatment machine. It is carried out there by kneading with incinerated fly ash. By this treatment, heavy metals react with the chelating agent to generate a compound insoluble in water, thereby preventing elution of the heavy metals.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、この処
理方法には次のような問題点があった。液体キレート剤
を希釈するのに用いられる上水や工程水には、マグネシ
ウム、カルシウム、ケイ素、鉄等の無機物が含まれてい
る。このような水によってジチオカルバミン酸塩などの
液体キレート剤を希釈すると、液体キレート剤自体が高
いｐＨ（アルカリ性）を示すために、希釈液のｐＨが上
昇する。ここで、希釈液のｐＨが約１０以上になると、
水中に含まれている上記の無機物から、ケイ酸マグネシ
ウム、ケイ酸カルシウム、ケイ酸鉄などが生成する。こ
れらの生成物は、スケールとなって沈積し、混練処理機
までの配管、ストレーナ、或いは混練処理機として用い
られる二軸押出成形機やバイブロミキサーなどの装置中
の配管やノズル部分で閉塞を起こす原因となっている。
このような装置内での閉塞が起こった場合には、その都
度部品の交換や分解清掃等の作業を行わなければなら
ず、極めて煩雑であった。However, this processing method has the following problems. The tap water and process water used to dilute the liquid chelating agent contain inorganic substances such as magnesium, calcium, silicon, and iron. When a liquid chelating agent such as a dithiocarbamate is diluted with such water, the pH of the diluting liquid increases because the liquid chelating agent itself has a high pH (alkaline). Here, when the pH of the diluent becomes about 10 or more,
Magnesium silicate, calcium silicate, iron silicate and the like are formed from the above-mentioned inorganic substances contained in water. These products are deposited as scale, causing clogging in pipes and nozzles in equipment such as a pipe to a kneader, a strainer, or a twin-screw extruder or a vibro mixer used as a kneader. Cause.
Whenever such blockage occurs in the apparatus, it is necessary to carry out operations such as replacement of parts and disassembly cleaning each time, which is extremely complicated.
【０００５】本発明は、かかる従来技術における問題を
解決し、焼却飛灰の重金属類溶出防止処理プロセスにお
いて、ケイ酸マグネシウムやケイ酸カルシウムなどのス
ケール発生による配管、ストレーナ、装置ノズル部分な
どの閉塞を防止することを目的とするものである。[0005] The present invention solves the problems in the prior art, and in the process for preventing heavy metals from being dissolved out of incinerated fly ash, clogging of pipes, strainers, nozzles of equipment and the like due to generation of scales such as magnesium silicate and calcium silicate. The purpose is to prevent the problem.
【０００６】[0006]
【課題を解決するための手段】上記課題を達成する手段
として、本発明者は、液体キレート剤希釈液に、アミノ
カルボン酸系キレート剤を含ませることにより、系中の
マグネシウム、カルシウムなどのスケール形成物質を除
去して、ケイ酸マグネシウム、ケイ酸カルシウムなどの
スケールの形成を防止することができることを見出し、
本発明を完成するに至った。As a means for achieving the above object, the present inventor has proposed that an aminocarboxylic acid-based chelating agent is added to a liquid chelating agent diluent to reduce the scale of magnesium, calcium and the like in the system. Finding out that forming substances can be removed to prevent the formation of scales such as magnesium silicate and calcium silicate,
The present invention has been completed.
【０００７】即ち、本発明の一態様は、焼却炉からの焼
却飛灰に液体キレート剤希釈液を添加して混練すること
を特徴とする焼却飛灰の処理方法において、液体キレー
ト剤希釈液中にアミノカルボン酸系キレート剤を含ませ
ることを特徴とする方法に関する。[0007] That is, one aspect of the present invention relates to a method for treating incinerated fly ash, which comprises adding a liquid chelating agent diluent to incineration fly ash from an incinerator and kneading the mixture. A chelating agent containing an aminocarboxylic acid.
【０００８】[0008]
【発明の実施の形態】本発明によれば、重金属捕捉剤と
しての液体キレート剤を水で希釈したキレート剤希釈液
中に、スケール生成防止剤としてアミノカルボン酸系キ
レート剤を含ませることにより、マグネシウムやカルシ
ウムなどのスケール形成性物質がアミノカルボン酸系キ
レート剤と結合して水中から除去される。これにより、
ｐＨの上昇に伴うケイ酸カルシウムやケイ酸マグネシウ
ムなどのようなスケール物質の生成が抑制される。According to the present invention, an aminocarboxylic acid-based chelating agent as a scale formation inhibitor is contained in a chelating agent diluent obtained by diluting a liquid chelating agent as a heavy metal scavenger with water. Scale-forming substances such as magnesium and calcium bind to the aminocarboxylic acid-based chelating agent and are removed from the water. This allows
The generation of scale substances such as calcium silicate and magnesium silicate accompanying the increase in pH is suppressed.
【０００９】本発明において重金属捕捉剤として用いる
ことのできる液体キレート剤としては、当該技術におい
て従来公知のジチオカルバミン酸基を有する化合物を挙
げることができる。具体的な化合物としては、ジエチル
ジチオカルバミン酸ナトリウム、Ｎ1,Ｎ2,Ｎ3,Ｎ5−テ
トラ（ジチオカルボキシ）テトラエチレンペンタミンの
４ナトリウム塩、ピペリジン−Ｎ−ジチオカルバミン酸
（ペンタメチレンジチオカルバミン酸）カリウムなどを
挙げることができる。使用の際には、この液体キレート
剤を水で希釈して用いるが、好ましい希釈倍率は、１〜
２５重量％濃度である。[0009] Examples of the liquid chelating agent which can be used as a heavy metal scavenger in the present invention include compounds having a dithiocarbamic acid group which are conventionally known in the art. Specific compounds, sodium diethyldithiocarbamate, N 1, N 2, N 3, N 5 - tetra (dithiocarboxy) tetraethylenepentamine tetrasodium salt of Min, piperidine -N- dithiocarbamate (pentamethylene dithiocarbamate) Potassium and the like can be mentioned. When used, the liquid chelating agent is used after being diluted with water.
The concentration is 25% by weight.
【００１０】また、本発明においてスケール生成防止剤
として用いられるアミノカルボン酸系キレート剤として
は、ＥＤＴＡ（エチレンジアミン四酢酸）、ＮＴＡ（ニ
トリロ三酢酸）、ＤＴＰＡ（ジエチレントリアミン五酢
酸）などのアルカリ金属塩等を挙げることができる。ア
ルカリ金属としては、ナトリウム、カリウム、リチウム
などが挙げられる。The aminocarboxylic acid-based chelating agent used as a scale formation inhibitor in the present invention includes alkali metal salts such as EDTA (ethylenediaminetetraacetic acid), NTA (nitrilotriacetic acid) and DTPA (diethylenetriaminepentaacetic acid). Can be mentioned. Examples of the alkali metal include sodium, potassium, lithium and the like.
【００１１】本発明におけるアミノカルボン酸系キレー
ト剤の使用量は、液体キレート剤の希釈液中に０．０１
〜１００，０００ｍｇ／Ｌ、好ましくは０．１〜１０，
０００ｍｇ／Ｌ、更に好ましくは１〜１，０００ｍｇ／
Ｌの範囲で存在させることが好ましい。なお、アミノカ
ルボン酸系キレート剤は、液体キレート剤希釈液中に加
えてもよく、或いは、液体キレート剤を希釈するために
用いる希釈水中に加えてもよい。更には、アミノカルボ
ン酸系キレート剤を重金属溶出防止剤である液体キレー
ト剤に添加して焼却飛灰用重金属溶出防止剤を調製し、
これを使用時に水で希釈して液体キレート剤希釈液とし
て用いることもできる。The amount of the aminocarboxylic acid chelating agent used in the present invention is 0.01 to 0.01 in the diluent of the liquid chelating agent.
-100,000 mg / L, preferably 0.1-10,
000 mg / L, more preferably 1 to 1,000 mg / L
It is preferred to be present in the range of L. The aminocarboxylic acid-based chelating agent may be added to a liquid chelating agent diluent, or may be added to diluting water used for diluting the liquid chelating agent. Further, an aminocarboxylic acid-based chelating agent is added to a liquid chelating agent that is a heavy metal elution inhibitor to prepare a heavy metal elution inhibitor for incineration fly ash,
This can be diluted with water at the time of use and used as a liquid chelating agent diluent.
【００１２】したがって、本発明の他の態様は、液体キ
レート剤及びアミノカルボン酸系キレート剤を含むこと
を特徴とする焼却飛灰用重金属溶出防止剤に関する。ま
た、本発明の更に他の態様は、アミノカルボン酸系キレ
ート剤を含むことを特徴とする、焼却飛灰からの重金属
溶出防止処理プロセスにおいて用いるためのスケール生
成防止剤に関する。Accordingly, another aspect of the present invention relates to a heavy metal elution inhibitor for incineration fly ash, which comprises a liquid chelating agent and an aminocarboxylic acid chelating agent. Still another embodiment of the present invention relates to a scale formation inhibitor for use in a process for preventing heavy metal from being dissolved from incinerated fly ash, which comprises an aminocarboxylic acid-based chelating agent.
【００１３】本発明にかかるアミノカルボン酸系キレー
ト剤を含む液体キレート剤希釈液を、焼却飛灰に加えて
混練することによって、焼却飛灰中に含まれている重金
属類が液体キレート剤と結合して水に不溶性の化合物が
生成する。これによって、焼却飛灰からの重金属類の溶
出が防止される。この際、希釈液中に上記に示した量の
アミノカルボン酸系キレート剤が存在していても、液体
キレート剤と重金属類との反応には影響を与えない。[0013] The liquid chelating agent diluent containing the aminocarboxylic acid chelating agent according to the present invention is added to the incineration fly ash and kneaded, whereby heavy metals contained in the incineration fly ash are combined with the liquid chelating agent. As a result, a compound insoluble in water is formed. This prevents elution of heavy metals from incinerated fly ash. At this time, even if the amount of the aminocarboxylic acid-based chelating agent described above is present in the diluent, the reaction between the liquid chelating agent and heavy metals is not affected.
【００１４】焼却飛灰と液体キレート剤希釈液とを混練
するために使用される混練機としては、当該技術におい
て周知の混練機、例えば、押出造粒機、転動造粒機など
を用いることができる。混練りは、常温〜８０℃程度の
温度で、混合物が均一な状態に混合されるまで行うこと
が好ましい。なお、混練りにより発熱が起こるので、混
練機に加熱手段を用いる必要性はない。As the kneading machine used for kneading the incinerated fly ash and the liquid chelating agent diluent, a kneading machine known in the art, for example, an extrusion granulator, a rolling granulator, or the like may be used. Can be. The kneading is preferably performed at a temperature of about room temperature to about 80 ° C. until the mixture is mixed in a uniform state. Since heat is generated by kneading, there is no need to use a heating means in the kneader.
【００１５】[0015]
【実施例】以下の実施例によって、本発明をより具体的
に説明する。以下の実施例は、本発明の好ましい態様の
例示であり、本発明を限定するものではない。以下にお
いてパーセント濃度はすべて重量基準である。The present invention will be described more specifically with reference to the following examples. The following examples are illustrative of preferred embodiments of the present invention and do not limit the present invention. In the following, all percentage concentrations are by weight.
【００１６】実施例１ ７５ｍｇ／ＬのＥＤＴＡ・Ｎａ塩水溶液中に、ジエチル
ジチオカルバミン酸ナトリウムを溶解して７．５％濃度
の重金属捕捉剤水溶液を作成した。この水溶液を、孔径
０．４５μｍのメンブランフィルターで濾過して、濾紙
上のスケール物質の重量を測定し、水溶液中のスケール
濃度を算出した。また、水溶液のｐＨも測定した。結果
を表１に示す。Example 1 In a 75 mg / L aqueous solution of EDTA · Na salt, sodium diethyldithiocarbamate was dissolved to prepare a 7.5% concentration aqueous solution of a heavy metal scavenger. This aqueous solution was filtered through a membrane filter having a pore size of 0.45 μm, the weight of the scale substance on the filter paper was measured, and the scale concentration in the aqueous solution was calculated. The pH of the aqueous solution was also measured. Table 1 shows the results.
【００１７】実施例２ ３７５ｍｇ／ＬのＥＤＴＡ・Ｎａ塩水溶液中に、Ｎ1,Ｎ
2,Ｎ3,Ｎ5−テトラ（ジチオカルボキシ）テトラエチレ
ンペンタミンの４ナトリウム塩を溶解して７．５％濃度
の重金属捕捉剤水溶液を作成した。この水溶液を、孔径
０．４５μｍのメンブランフィルターで濾過して、濾紙
上のスケール物質の重量を測定し、水溶液中のスケール
濃度を算出した。また、水溶液のｐＨも測定した。結果
を表１に示す。Example 2 In a 375 mg / L aqueous solution of EDTA · Na salt, N 1 , N
2, N 3, N 5 - has created a heavy metal scavenger solution 7.5% strength by dissolving tetrasodium salt of tetra (dithiocarboxy) tetraethylene pentamine. This aqueous solution was filtered through a membrane filter having a pore size of 0.45 μm, the weight of the scale substance on the filter paper was measured, and the scale concentration in the aqueous solution was calculated. The pH of the aqueous solution was also measured. Table 1 shows the results.
【００１８】実施例３ ５０％濃度のジエチルジチオカルバミン酸ナトリウム水
溶液に、ＥＤＴＡ・Ｎａ塩を０．５（ｗ／ｗ％）濃度で
溶解した。この混合溶液を水道水で希釈して、７．５％
濃度の重金属捕捉剤水溶液を作成した。この水溶液を、
孔径０．４５μｍのメンブランフィルターで濾過して、
濾紙上のスケール物質の重量を測定し、水溶液中のスケ
ール濃度を算出した。また、水溶液のｐＨも測定した。
結果を表１に示す。Example 3 EDTA.Na salt was dissolved in a 50% aqueous solution of sodium diethyldithiocarbamate at a concentration of 0.5 (w / w%). This mixed solution was diluted with tap water to 7.5%
A heavy metal scavenger aqueous solution having a concentration was prepared. This aqueous solution is
Filtered with a 0.45 μm pore size membrane filter,
The weight of the scale substance on the filter paper was measured, and the scale concentration in the aqueous solution was calculated. The pH of the aqueous solution was also measured.
Table 1 shows the results.
【００１９】実施例４ ０．０５ｍｇ／ＬのＥＤＴＡ・Ｎａ塩水溶液を用いて、
この中にジエチルジチオカルバミン酸ナトリウムを溶解
した他は実施例１と同様に実験を行った。結果を表１に
示す。Example 4 Using a 0.05 mg / L aqueous solution of EDTA · Na salt,
An experiment was conducted in the same manner as in Example 1 except that sodium diethyldithiocarbamate was dissolved therein. Table 1 shows the results.
【００２０】実施例５ ９０，０００ｍｇ／ＬのＥＤＴＡ・Ｎａ塩水溶液を用い
て、この中にＮ1,Ｎ2,Ｎ3,Ｎ5−テトラ（ジチオカルボ
キシ）テトラエチレンペンタミンの４ナトリウム塩を溶
解した他は実施例２と同様に実験を行った。結果を表１
に示す。[0020] using EDTA · Na salt solution of Example 5 90,000mg / L, N 1, N 2, N 3, N 5 in this - tetra (dithiocarboxy) tetrasodium salt of tetraethylene pentamine The experiment was carried out in the same manner as in Example 2 except that it was dissolved. Table 1 shows the results
Shown in
【００２１】実施例６ ５０％濃度のジエチルジチオカルバミン酸ナトリウム水
溶液に、ＥＤＴＡ・Ｎａ塩を０．０５（ｗ／ｗ％）濃度
で溶解して混合溶液を調製した他は実施例３と同様に実
験を行った。結果を表１に示す。Example 6 An experiment was conducted in the same manner as in Example 3 except that a mixed solution was prepared by dissolving EDTA · Na salt in a 50% aqueous sodium diethyldithiocarbamate solution at a concentration of 0.05 (w / w%). Was done. Table 1 shows the results.
【００２２】比較例１ ジエチルジチオカルバミン酸ナトリウムを水道水で希釈
して、７．５％濃度の水溶液を作成した。この水溶液
を、孔径０．４５μｍのメンブランフィルターで濾過し
て、濾紙上のスケール物質の重量を測定し、水溶液中の
スケール濃度を算出した。また、水溶液のｐＨも測定し
た。結果を表１に示す。COMPARATIVE EXAMPLE 1 Sodium diethyldithiocarbamate was diluted with tap water to prepare a 7.5% aqueous solution. This aqueous solution was filtered with a membrane filter having a pore size of 0.45 μm, the weight of the scale substance on the filter paper was measured, and the scale concentration in the aqueous solution was calculated. The pH of the aqueous solution was also measured. Table 1 shows the results.
【００２３】[0023]
【表１】 [Table 1]
【００２４】表１より、アミノカルボン酸系キレート剤
を含まない比較例１の重金属捕捉剤希釈液では、スケー
ルが２５ｍｇ／Ｌの濃度で生成していたのに対して、本
発明の実施例においては水溶液のスケール濃度が大幅に
減少していたことが分かる。なお、上記実施例１〜３及
び比較例１で生成したスケールの蛍光Ｘ線分析を行った
ところ、スケールは、ケイ素、マグネシウム、カルシウ
ム、アルミニウム及び鉄が主成分であることが分かっ
た。From Table 1, it can be seen that in the heavy metal scavenger diluent containing no aminocarboxylic acid-based chelating agent, the scale was formed at a concentration of 25 mg / L, whereas in the Examples of the present invention. Indicates that the scale concentration of the aqueous solution was significantly reduced. In addition, when the fluorescent X-ray analysis of the scales produced in Examples 1 to 3 and Comparative Example 1 was performed, it was found that the scales were mainly composed of silicon, magnesium, calcium, aluminum and iron.
【００２５】実施例４ 実施例１〜３で調製した重金属捕捉剤水溶液を、焼却炉
から取り出した焼却飛灰に対重量比で４０％添加し（重
金属捕捉剤有効成分添加率＝７．５×０．４＝３％(w/
w)）、二軸押出混練機を用いて、約１分間混練処理を行
った。混練中の発熱により混練物の温度は約８０℃に上
昇した。処理前及び処理後の焼却飛灰のｐＨ及び焼却飛
灰からの溶出重金属濃度の測定を行った。重金属類の溶
出濃度は、環境庁告示１３号法に準拠して測定を行っ
た。結果を表２に示す。Example 4 The aqueous solution of the heavy metal scavenger prepared in Examples 1 to 3 was added to the incinerated fly ash taken out of the incinerator at a ratio of 40% by weight to the incinerated fly ash (addition ratio of the heavy metal scavenger active ingredient = 7.5 ×). 0.4 = 3% (w /
w)), kneading was performed for about 1 minute using a twin-screw extruder. The temperature of the kneaded material rose to about 80 ° C. due to heat generation during kneading. The pH of the incinerated fly ash before and after the treatment and the concentration of heavy metal dissolved from the incinerated fly ash were measured. The elution concentration of heavy metals was measured in accordance with the Environment Agency Notification No. 13 method. Table 2 shows the results.
【００２６】[0026]
【表２】 [Table 2]
【００２７】表２より、重金属捕捉剤にスケール生成防
止剤としてアミノカルボン酸系キレート剤を加えた本発
明にかかる重金属溶出防止剤は、焼却飛灰中の重金属類
の溶出防止に関して優れた効果を有していることが示さ
れた。From Table 2, it can be seen that the heavy metal elution inhibitor of the present invention obtained by adding an aminocarboxylic acid chelating agent as a scale formation inhibitor to a heavy metal scavenger has an excellent effect on preventing elution of heavy metals from incinerated fly ash. It was shown to have.
【００２８】[0028]
【発明の効果】本発明に係る重金属溶出防止剤は、重金
属捕捉剤にスケール生成防止剤としてアミノカルボン酸
系キレート剤を加えているので、優れた重金属溶出防止
効果を示すと共に、希釈液調整用の水中の無機物イオン
に起因するケイ酸カルシウムやケイ酸マグネシウムなど
のスケール物質の生成を防止することができ、配管や混
練機ノズルなどの閉塞を防ぐことができる。The heavy metal elution inhibitor according to the present invention exhibits an excellent heavy metal elution prevention effect since an aminocarboxylic acid-based chelating agent is added to the heavy metal scavenger as a scale formation inhibitor, and at the same time, is used for preparing a diluent. The formation of scale substances such as calcium silicate and magnesium silicate caused by inorganic ions in water can be prevented, and clogging of pipes, kneader nozzles, and the like can be prevented.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 柳沢 浩次郎 東京都大田区羽田旭町11番１号 株式会社 荏原製作所内 (72)発明者 池田 太 東京都大田区羽田旭町11番１号 株式会社 荏原製作所内 Ｆターム(参考） 4D004 AA37 AB03 CA34 CC06 DA03 DA10 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Kojiro Yanagisawa, Inventor 11-1 Haneda Asahimachi, Ota-ku, Tokyo Inside Ebara Works Co., Ltd. F-term in EBARA CORPORATION (reference) 4D004 AA37 AB03 CA34 CC06 DA03 DA10
Claims (5)
希釈液を添加して混練することを特徴とする焼却飛灰の
処理方法において、液体キレート剤希釈液中にアミノカ
ルボン酸系キレート剤を含ませることを特徴とする方
法。1. A method for treating incineration fly ash, comprising adding a liquid chelating agent diluent to incineration fly ash from an incinerator and kneading the mixture, wherein the aminocarboxylic acid-based chelating agent is contained in the liquid chelating agent diluent. The method characterized by including.
ン酸系キレート剤の量が、０．０１〜１００，０００
（ｍｇ／Ｌ）である請求項１に記載の方法。2. The amount of the aminocarboxylic acid-based chelating agent in the liquid chelating agent diluent is 0.01 to 100,000.
(Mg / L).
キレート剤を含むことを特徴とする重金属溶出防止剤。3. A heavy metal elution inhibitor comprising a liquid chelating agent and an aminocarboxylic acid chelating agent.
基を有するものである請求項３に記載の重金属溶出防止
剤。4. The heavy metal elution inhibitor according to claim 3, wherein the liquid chelating agent has a dithiocarbamic acid group.
とを特徴とする、焼却飛灰からの重金属溶出防止処理プ
ロセスにおいて用いるためのスケール生成防止剤。5. A scale formation inhibitor for use in a heavy metal leaching prevention process from incinerated fly ash, which comprises an aminocarboxylic acid-based chelating agent.
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|---|---|---|---|
| JP2001274699A JP2002166247A (en) | 2000-09-20 | 2001-09-11 | Heavy metal elusion inhibitor and method for treating fly ash therewith |
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| JP2000-284491 | 2000-09-20 | ||
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108744383A (en) * | 2018-08-06 | 2018-11-06 | 成都市兴蓉再生能源有限公司 | A kind of compound incineration of refuse flyash chelating agent and preparation method thereof |
| CN109759418A (en) * | 2018-12-20 | 2019-05-17 | 上海康恒环境股份有限公司 | A kind of domestic garbage incineration flyash chelating stabilization method |
| WO2024143028A1 (en) * | 2022-12-27 | 2024-07-04 | ミヨシ油脂株式会社 | Heavy metal treatment agent, and method for treating wastewater and incineration ash using same |
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| WO2024143028A1 (en) * | 2022-12-27 | 2024-07-04 | ミヨシ油脂株式会社 | Heavy metal treatment agent, and method for treating wastewater and incineration ash using same |
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