JP2001246348A - Method of treating ash containing selenium - Google Patents
Method of treating ash containing seleniumInfo
- Publication number
- JP2001246348A JP2001246348A JP2000062433A JP2000062433A JP2001246348A JP 2001246348 A JP2001246348 A JP 2001246348A JP 2000062433 A JP2000062433 A JP 2000062433A JP 2000062433 A JP2000062433 A JP 2000062433A JP 2001246348 A JP2001246348 A JP 2001246348A
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- Prior art keywords
- ash
- containing ash
- added
- kneading
- heavy metal
- 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.)
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- Gasification And Melting Of Waste (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はＳｅ（セレン）含有
灰の処理方法に係り、特に、Ｓｅ含有灰に第一鉄塩を添
加、混練することにより、或いは更に重金属固定剤を添
加、混練することにより、Ｓｅ含有灰からのＳｅ及びそ
の他の重金属類の溶出を確実に防止する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating Se (selenium) -containing ash, and in particular, by adding and kneading a ferrous salt to a Se-containing ash, or further adding and kneading a heavy metal fixing agent. Accordingly, the present invention relates to a method for reliably preventing the elution of Se and other heavy metals from Se-containing ash.
【０００２】[0002]
【従来の技術】都市ゴミ、産業廃棄物、下水汚泥、石炭
を燃焼させた際に発生する飛灰（フライアッシュ）や焼
却灰（ボトムアッシュ）などの焼却残渣、もしくはこれ
らを溶融した際に発生する飛灰（溶融飛灰（本発明にお
いては、以下、これらを「Ｓｅ含有灰」と称す。）は、
通常、埋立処分されるが、これらはＳｅやその他、Ｐ
ｂ，Ｃｄ等の重金属類を含有するため、その処分に当っ
ては、Ｓｅ、その他の重金属類の溶出を防止する処理を
施す必要がある。2. Description of the Related Art Incineration residues such as fly ash and incinerated ash (bottom ash) generated when municipal garbage, industrial waste, sewage sludge, and coal are burned, or generated when these are melted Fly ash (melt fly ash (hereinafter, referred to as “Se-containing ash”) in the present invention)
Usually they are landfilled, but these are Se and others, P
Since it contains heavy metals such as b and Cd, it is necessary to perform a treatment for preventing the elution of Se and other heavy metals at the time of disposal.
【０００３】従来、Ｓｅ含有灰、その他のＳｅ含有物か
らＳｅ等の重金属類の溶出を防止する方法としては、次
のような方法が提案されている。Conventionally, the following method has been proposed as a method for preventing the elution of heavy metals such as Se from Se-containing ash and other Se-containing substances.
【０００４】 Ｓｅを含有したメッキ排水処理汚泥
に、セメントを混合してｐＨ１０〜１２として養生後、
塩化第二鉄を添加してｐＨ４〜７に調整して、Ｓｅの溶
出を防止する方法（「セレンを含む産業廃棄物のセメン
ト固化による処理技術の検討」第８回廃棄物学会研究発
表会講演論文集：ｐｐ．９３４−９３６）。[0004] Cement is mixed with the plating wastewater treatment sludge containing Se to adjust the pH to 10 to 12, and the mixture is cured.
A method to prevent the elution of Se by adjusting the pH to 4 to 7 by adding ferric chloride (“Examination of treatment technology by solidification of industrial waste containing selenium by cement” The 8th Annual Conference of Japan Society of Waste Management Dissertations: pp. 934-936).
【０００５】 塩化第一鉄又は硫酸第一鉄単独、もし
くはこれらの第一鉄塩とキレート剤との併用処理で、溶
融飛灰の重金属類と六価クロムを固定化する方法。A method of immobilizing heavy metals and hexavalent chromium in molten fly ash by treatment with ferrous chloride or ferrous sulfate alone or in combination with a ferrous salt thereof and a chelating agent.
【０００６】 飛灰のｐＨを８以上にして、硫化剤
と、硫化剤に対して当量以上の第一鉄塩を加え、ｐＨを
９〜１１で重金属類を固定化する方法。[0006] A method of adjusting the pH of fly ash to 8 or more, adding a sulfurizing agent and a ferrous salt in an equivalent amount or more to the sulfurating agent, and immobilizing heavy metals at pH 9 to 11.
【０００７】 焼却灰に、キレート剤及び塩化第一鉄
などのフェライト形成塩を添加し、ｐＨ又は温度をフェ
ライト形成域に調整して、重金属類を固定化する方法。[0007] A method in which a chelating agent and a ferrite-forming salt such as ferrous chloride are added to incinerated ash, and the pH or temperature is adjusted to a ferrite-forming region to fix heavy metals.
【０００８】[0008]
【発明が解決しようとする課題】しかしながら、上記従
来の方法では、いずれもＳｅを含む重金属類を確実に防
止し得ず、その改良が望まれている。However, none of the above-mentioned conventional methods can reliably prevent heavy metals including Se, and improvements are desired.
【０００９】即ち、の方法では、処理物のｐＨが４〜
７であり、酸性領域で溶出しやすい鉛、カドミウム等の
重金属類が処理物に含有されている場合、Ｓｅの溶出が
防止できても、これらが溶出してしまう。また、，
の方法では、六価クロムの還元処理と、ｐＨ調整による
重金属類の不溶化は可能であるが、Ｓｅの不溶化のため
にはｐＨ調整や第一鉄塩の添加率が不十分で、Ｓｅの不
溶化処理はできない。の方法も、フェライト化を主眼
においており、ｐＨ、温度調整もフェライト化のための
条件であるために、Ｓｅ不溶化のためにはｐＨ調整が不
十分で、Ｓｅを確実に不溶化処理することはできない。That is, in the method (1), the pH of the treated product is 4 to
7, when heavy metals such as lead and cadmium which are easily eluted in the acidic region are contained in the treated product, they are eluted even if the elution of Se can be prevented. Also,,
In the method of (1), reduction treatment of hexavalent chromium and insolubilization of heavy metals by pH adjustment are possible. Processing is not possible. Also focuses on ferrite formation, and since pH and temperature adjustments are also conditions for ferrite formation, pH adjustment is insufficient for Se insolubilization, and Se cannot be reliably insolubilized. .
【００１０】本発明は、上記従来の問題点を解決し、Ｓ
ｅ含有灰に第一鉄塩を添加、混練することにより、或い
は更に重金属固定剤を添加、混練することにより、Ｓｅ
含有灰からのＳｅ及びその他の重金属類の溶出を確実に
防止するＳｅ含有灰の処理方法を提供することを目的と
する。The present invention solves the above-mentioned conventional problems, and
By adding and kneading a ferrous salt to the e-containing ash, or further adding and kneading a heavy metal fixing agent, Se
An object of the present invention is to provide a method for treating Se-containing ash, which reliably prevents the elution of Se and other heavy metals from the contained ash.
【００１１】[0011]
【課題を解決するための手段】請求項１のＳｅ含有灰の
処理方法は、Ｓｅ含有灰に第一鉄塩を添加、混練するこ
とにより、該Ｓｅ含有灰からのＳｅの溶出を防止するＳ
ｅ含有灰の処理方法において、該Ｓｅ含有灰にアルカリ
を添加して該Ｓｅ含有灰をｐＨ１１以上とした後、ｐＨ
１１以上を維持した状態で第一鉄塩の添加、混練を行う
ことを特徴とする。According to a first aspect of the present invention, there is provided a method for treating Se-containing ash, wherein a ferrous salt is added to the Se-containing ash and kneaded to prevent the elution of Se from the Se-containing ash.
In the method for treating an e-containing ash, an alkali is added to the Se-containing ash to adjust the Se-containing ash to a pH of 11 or more.
It is characterized in that the ferrous salt is added and kneaded while maintaining 11 or more.
【００１２】請求項２のＳｅ含有灰の処理方法は、Ｓｅ
含有灰に第一鉄塩と重金属固定剤とを添加、混練するこ
とにより、該Ｓｅ含有灰からのＳｅとその他の重金属類
の溶出を防止するＳｅ含有灰の処理方法において、該Ｓ
ｅ含有灰に第一鉄塩を添加、混練した後、重金属固定剤
を添加、混練する方法であって、該Ｓｅ含有灰にアルカ
リを添加して該Ｓｅ含有灰をｐＨ１１以上とした後、ｐ
Ｈ１１以上を維持した状態で第一鉄塩の添加、混練と重
金属固定剤の添加、混練を行うことを特徴とする。[0012] The method for treating Se-containing ash according to claim 2 is characterized in that:
In a method for treating Se-containing ash which prevents elution of Se and other heavy metals from the Se-containing ash by adding and kneading a ferrous salt and a heavy metal fixing agent to the containing ash,
A method of adding and kneading a ferrous salt to an e-containing ash, and then adding and kneading a heavy metal fixing agent, wherein an alkali is added to the Se-containing ash to adjust the Se-containing ash to a pH of 11 or more, and then p
The method is characterized in that the addition and kneading of the ferrous salt and the addition and kneading of the heavy metal fixing agent are performed while maintaining H11 or more.
【００１３】本発明の方法では、焼却残渣や溶融飛灰等
のＳｅ含有灰にアルカリを加えｐＨを１１以上にするこ
とにより、Ｓｅが溶出する。次に、この状態で第一鉄塩
溶液を加えることによりＳｅ６＋をＳｅ４＋に還元し、
また還元されたＳｅ４＋やもともとＳｅ含有灰に含有さ
れているＳｅ４＋と鉄とが反応して難溶解性の塩（亜セ
レン酸鉄）を形成し、Ｓｅが不溶化する。これと共に、
Ｃｒ６＋はＣｒ３＋に還元され、難溶性の塩（水酸化ク
ロム）として不溶化する。特に、その後、リン酸や硫化
物等の重金属固定剤を添加することにより、アルカリ領
域で溶出するＰｂ，Ｚｎなどの二価の両性金属を難溶性
リン酸化合物（Ｐｂ５（ＰＯ４）３Ｃｌ，Ｚｎ３（ＰＯ
４）２）や硫化物（ＰｂＳ，ＺｎＳなど）にして不溶化
することができる。In the method of the present invention, Se is eluted by adding an alkali to Se-containing ash such as incineration residue and molten fly ash to adjust the pH to 11 or more. Next, Se 6+ is reduced to Se 4+ by adding a ferrous salt solution in this state,
Also a reduced Se 4+ and originally Se 4+ and iron contained in the Se-containing ash react to form a poorly soluble salt (selenite iron), Se is insoluble. With this,
Cr 6+ is reduced to Cr 3+ and insolubilized as a hardly soluble salt (chromium hydroxide). In particular, thereafter, a heavy metal fixing agent such as phosphoric acid or sulfide is added to convert a divalent amphoteric metal such as Pb or Zn that elutes in the alkaline region into a poorly soluble phosphate compound (Pb 5 (PO 4 ) 3 Cl). , Zn 3 (PO
4 ) It can be insolubilized into 2 ) or sulfide (PbS, ZnS, etc.).
【００１４】本発明において、第一鉄塩としては塩化第
一鉄及び／又は硫酸第一鉄を用いることができ、その添
加量はＳｅ含有灰１００重量部に対して５〜１００重量
部とするのが好ましい。また、重金属固定剤としてはリ
ン酸、リン酸塩、キレート剤、硫化ソーダ、水硫化ソー
ダ及び硫化カルシウムよりなる群から選ばれる１種又は
２種以上が好適であり、ｐＨ調整用のアルカリとしては
苛性ソーダ、苛性カリ、消石灰及びセメントよりなる群
から選ばれる１種又は２種以上を用いることができる。
前記セメントとしてはポルトランドセメント、高炉セメ
ント、アルミナセメントのいずれも使用可能である。In the present invention, ferrous chloride and / or ferrous sulfate can be used as the ferrous salt, and the amount of the ferrous salt is 5 to 100 parts by weight based on 100 parts by weight of the ash containing Se. Is preferred. Further, as the heavy metal fixing agent, one or more selected from the group consisting of phosphoric acid, phosphate, chelating agent, sodium sulfide, sodium hydrosulfide and calcium sulfide is preferable, and as the alkali for pH adjustment, One or more selected from the group consisting of caustic soda, caustic potash, slaked lime and cement can be used.
As the cement, any of Portland cement, blast furnace cement, and alumina cement can be used.
【００１５】[0015]
【発明の実施の形態】以下に本発明の実施の形態を詳細
に説明する。Embodiments of the present invention will be described below in detail.
【００１６】本発明において、処理対象とするＳｅ含有
灰とは、都市ゴミ、産業廃棄物、下水汚泥、石炭を燃焼
させた際に発生する飛灰（フライアッシュ）や焼却灰
（ボトムアッシュ）などの焼却残渣、或いはこれらを溶
融した際に発生する飛灰（溶融飛灰）等の、Ｓｅとその
他の重金属類を含有するものである。In the present invention, the Se-containing ash to be treated includes municipal garbage, industrial waste, sewage sludge, fly ash generated when coal is burned, and fly ash (bottom ash). Contains Se and other heavy metals, such as incineration residues of, or fly ash (melted fly ash) generated when these are melted.
【００１７】本発明において、これらのＳｅ含有灰に、
まずアルカリを添加してｐＨ１１以上に調整する。この
調整ｐＨが１１未満では、Ｓｅやその他の重金属類、特
にＣｄの溶出を防止し得ない。この調整ｐＨは過度に高
いとアルカリ添加コストが高騰する上に、第一鉄塩の添
加後、重金属固定剤を添加しない場合には、両性金属の
Ｐｂ等の溶出量が増加することから、その後の重金属固
定剤の添加の有無に応じて、重金属固定剤を添加しない
場合の調整ｐＨは１１〜１２、重金属固定剤を添加する
場合の調整ｐＨは１１〜１３とするのが好ましい。この
調整ｐＨは、その後の第一鉄塩の添加、混練、更に重金
属固定剤を添加する場合には、重金属固定剤の添加、混
練の処理工程において維持されるようにする。In the present invention, these Se-containing ashes include:
First, the pH is adjusted to 11 or more by adding an alkali. If the adjusted pH is less than 11, the elution of Se and other heavy metals, particularly Cd, cannot be prevented. If the adjusted pH is excessively high, the alkali addition cost rises. In addition, if the heavy metal fixing agent is not added after the addition of the ferrous salt, the elution amount of the amphoteric metal such as Pb increases. The adjusted pH when no heavy metal fixing agent is added is preferably 11 to 12, and the adjusted pH when the heavy metal fixing agent is added is preferably 11 to 13, depending on whether or not the heavy metal fixing agent is added. This adjusted pH is maintained during the subsequent steps of adding and kneading the ferrous salt, and further adding the heavy metal fixing agent when adding the heavy metal fixing agent.
【００１８】なお、Ｓｅ含有灰に添加するアルカリとし
ては特に制限はなく、苛性ソーダ、苛性カリ、消石灰、
セメント等の１種を単独で、或いは２種以上を混合して
用いることができる。The alkali added to the Se-containing ash is not particularly limited, and is caustic soda, caustic potash, slaked lime,
One kind of cement or the like can be used alone, or two or more kinds can be used in combination.
【００１９】Ｓｅ含有灰にアルカリを添加してｐＨ１１
以上に調整した後は、第一鉄塩を添加して十分に混練す
る。この第一鉄塩としては、塩化第一鉄、硫酸第一鉄等
の１種又は２種以上を用いることができ、その添加量は
少な過ぎるとＳｅその他の重金属類の溶出防止効果が十
分でなく、多過ぎてもそれ以上の効果は望めず、徒に薬
剤コストが高騰するため、Ｓｅ含有灰（アルカリを含ま
ないＳｅ含有灰）１００重量部に対して５〜１００重量
部、特に２０〜４０重量部とするのが望ましい。第一鉄
塩は、その取り扱い上、水溶液として添加するのが好ま
しく、一般的には３０〜４０重量％程度の水溶液として
使用される。An alkali is added to the ash containing Se to adjust the pH to 11
After the above adjustment, ferrous salt is added and kneaded sufficiently. As the ferrous salt, one or more of ferrous chloride, ferrous sulfate, and the like can be used. If the amount of addition is too small, the effect of preventing the elution of Se and other heavy metals is sufficient. No further effect can be expected even if the amount is too large, and the cost of the drug rises unnecessarily. It is desirable to use 40 parts by weight. The ferrous salt is preferably added as an aqueous solution in terms of handling, and is generally used as an aqueous solution of about 30 to 40% by weight.
【００２０】なお、この第一鉄塩の添加に際しては、混
練性の向上のために更に水を添加しても良い。この水の
添加量は、処理効果に影響を及ぼすものではなく、混練
性、取り扱い性の面から、適宜決定される。When the ferrous salt is added, water may be further added to improve the kneading property. The amount of water added does not affect the treatment effect, and is appropriately determined from the viewpoint of kneading and handling.
【００２１】この第一鉄塩の添加後に重金属固定剤を添
加する場合、使用される重金属固定剤としては、リン
酸、リン酸塩、キレート剤、硫化ソーダ、水硫化ソー
ダ、硫化カルシウム等が挙げられ、これらは１種を単独
で、或いは２種以上を併用して用いることができる。こ
の重金属固定剤の添加量は、処理するＳｅ含有灰の性
状、処理ｐＨ等に応じて適宜決定されるが、通常の場
合、Ｓｅ含有灰（アルカリ及び第一鉄塩を含まないＳｅ
含有灰）１００重量部に対して１〜３０重量部とするの
が好ましい。When the heavy metal fixing agent is added after the addition of the ferrous salt, examples of the heavy metal fixing agent used include phosphoric acid, phosphate, chelating agent, sodium sulfide, sodium hydrosulfide, calcium sulfide and the like. These can be used alone or in combination of two or more. The amount of the heavy metal fixing agent to be added is appropriately determined depending on the properties of the Se-containing ash to be treated, the treatment pH, and the like. In general, however, the Se-containing ash (Se containing no alkali and ferrous salt) is used.
The content is preferably 1 to 30 parts by weight with respect to 100 parts by weight of the contained ash.
【００２２】このようにして処理された処理灰は、Ｓ
ｅ、その他の重金属類が確実に固定化され、その溶出量
は埋立基準値を十分に満足するものであるため、埋立処
分に供することができる。The treated ash thus treated is S
e) Since other heavy metals are immobilized with certainty and the amount of elution sufficiently satisfies the landfill standard value, it can be used for landfill disposal.
【００２３】[0023]
【実施例】以下に実施例及び比較例を挙げて本発明をよ
り具体的に説明する。The present invention will be described more specifically below with reference to examples and comparative examples.
【００２４】なお、以下の実施例及び比較例で処理した
供試灰Ａ，Ｂの成分分析結果は表１に示す通りである。The results of component analysis of the test ashes A and B treated in the following Examples and Comparative Examples are as shown in Table 1.
【００２５】[0025]
【表１】 [Table 1]
【００２６】また、処理効果の判定は、処理灰を採取し
て、下記の環境庁告示１３号試験により行った。The treatment effect was determined by sampling the treated ash and conducting the following test conducted by the Environment Agency, No. 13.
【００２７】［環境庁告示１３号試験］ボトルに試料及
び試料重量の１０倍量（重量）の蒸留水を入れ、６時間
振とう後、１μｍのグラスファイバーペーパーフィルタ
ーで濾過した濾液を検液とし、その検液中の重金属の濃
度を測定する。溶出値が基準を満足する場合には、埋立
処分することが可能となる。[Environment Agency Notification No. 13 Test] A sample and 10 times the weight of the sample weight (weight) of distilled water were placed in a bottle, shaken for 6 hours, and the filtrate filtered with a 1 μm glass fiber paper filter was used as a test solution. Then, the concentration of heavy metal in the test solution is measured. If the elution value satisfies the standard, it can be landfilled.
【００２８】また、重金属固定剤としては、栗田工業
（株）製「アッシュナイトＲ７０３」（キレート剤系）
を用いた。As a heavy metal fixing agent, "Ashnite R703" manufactured by Kurita Kogyo KK (chelating agent)
Was used.
【００２９】実施例１〜５、比較例１〜５ ５００ｍＬのポリビーカーに供試灰Ａと表２に示す量の
消石灰を入れ、十分に混合後、水１０重量％対灰と、表
２に示す量の３０重量％塩化第一鉄水溶液を添加し、ス
パーテルを用いて十分に混練した。この処理灰について
環境庁告示１３号試験を行い、結果を表２に示した。な
お、この処理において、ｐＨは表２に示す値に維持され
た。Examples 1 to 5 and Comparative Examples 1 to 5 The test ash A and the amount of slaked lime shown in Table 2 were placed in a 500 mL polybeaker, mixed well, and then mixed with 10% by weight of water and ash. The indicated amount of a 30% by weight aqueous ferrous chloride solution was added, and kneaded sufficiently using a spatula. This treated ash was subjected to the Environment Agency Notification No. 13 test, and the results are shown in Table 2. In this treatment, the pH was maintained at the value shown in Table 2.
【００３０】[0030]
【表２】 [Table 2]
【００３１】表２より明らかなように、塩化第一鉄の添
加量を増しても、ｐＨが低い範囲ではＳｅへの効果がな
く、また、ＰｂやＣｄなどの重金属が溶出する。ただ
し、塩化第一鉄のＣｒ６＋への効果は顕著である。消石
灰を加えｐＨを１１以上にした処理灰は、塩化第一鉄の
添加量を増すとＳｅへの効果が顕著で、また、Ｐｂ，Ｃ
ｄ，Ｃｒ６＋も溶出しない。As is clear from Table 2, even if the amount of ferrous chloride added is increased, there is no effect on Se in a low pH range, and heavy metals such as Pb and Cd are eluted. However, the effect of ferrous chloride on Cr 6+ is remarkable. The treated ash to which the pH has been increased to 11 or more by adding slaked lime has a remarkable effect on Se when the added amount of ferrous chloride is increased, and Pb, C
d, Cr 6+ also does not elute.
【００３２】実施例６〜９、比較例６，７ ５００ｍＬのポリビーカーに供試灰Ｂと表３に示す量の
消石灰を入れ、十分に混合後、１０重量％対灰の水と、
表３に示す量の３０重量％塩化第一鉄水溶液を添加し、
スパーテルを用いて十分に混練後、更に表３に示す量の
重金属固定剤を添加、混練した。この処理灰について環
境庁告示１３号試験を行い、結果を表３に示した。な
お、この処理において、ｐＨは表３に示す値に維持され
た。Examples 6 to 9 and Comparative Examples 6 and 7 The test ash B and the slaked lime in the amounts shown in Table 3 were placed in a 500 mL polybeaker, mixed well, and then mixed with 10% by weight of ash water.
A 30% by weight aqueous ferrous chloride solution in the amount shown in Table 3 was added,
After sufficiently kneading using a spatula, a heavy metal fixing agent in an amount shown in Table 3 was further added and kneaded. The treated ash was subjected to the Environment Agency Notification No. 13 test, and the results are shown in Table 3. In this treatment, the pH was maintained at the value shown in Table 3.
【００３３】[0033]
【表３】 [Table 3]
【００３４】表３より明らかなように、ｐＨ１２以上で
塩化第一鉄の添加量を増すと、Ｓｅへの効果は顕著であ
る。また、通常、ｐＨが１２以上になると両性金属のＰ
ｂの溶出が増加するが、重金属固定剤により不溶化され
ている。Ｈｇも重金属固定剤により不溶化されている。As is clear from Table 3, the effect on Se is remarkable when the addition amount of ferrous chloride is increased at pH 12 or more. In general, when the pH becomes 12 or more, the amphoteric metal P
Although the elution of b increases, it is insolubilized by the heavy metal fixing agent. Hg is also insolubilized by the heavy metal fixing agent.
【００３５】実施例１０，１１ 供試灰Ａ，Ｂに表４に示す量の消石灰を混合した後、混
練機へ供給し、まず、表４に示す量の３０重量％塩化第
一鉄水溶液を添加、混練後、表４に示す量の重金属固定
剤を添加、混練し（ただし、実施例１０では、重金属固
定剤を添加せず。）、処理灰について環境庁告示１３号
試験を行い、結果を表４に示した。なお、この処理にお
いて、ｐＨは表４に示す値に維持された。Examples 10 and 11 After mixing slaked lime in the amounts shown in Table 4 with the test ashes A and B, the mixture was supplied to a kneader. First, a 30% by weight aqueous solution of ferrous chloride in the amount shown in Table 4 was added. After the addition and kneading, the amount of the heavy metal fixing agent shown in Table 4 was added and kneaded (however, in Example 10, the heavy metal fixing agent was not added). Are shown in Table 4. In this treatment, the pH was maintained at the value shown in Table 4.
【００３６】表４には、供試灰Ａ，ＢのｐＨ及び供試灰
Ａ，Ｂについて何ら処理を施すことなく環境庁告示１３
号試験を行った結果と、埋立基準値も併記した。Table 4 shows the pH of the test ashes A and B and the notification of the Environment Agency 13 without any treatment on the test ashes A and B.
And the landfill standard values are also shown.
【００３７】[0037]
【表４】 [Table 4]
【００３８】表４より、本発明の方法によれば、全ての
重金属類について、埋立基準値を満足することができる
ことがわかる。From Table 4, it can be seen that according to the method of the present invention, the landfill standard values can be satisfied for all heavy metals.
【００３９】[0039]
【発明の効果】以上詳述した通り、本発明のＳｅ含有灰
の処理方法によれば、Ｓｅ含有灰に第一鉄塩を添加、混
練することにより、或いは更に重金属固定剤を添加、混
練することにより、Ｓｅ含有灰からのＳｅ及びその他の
重金属類の溶出を確実に防止することができる。As described above in detail, according to the method for treating Se-containing ash of the present invention, a ferrous salt is added to and kneaded with Se-containing ash, or a heavy metal fixing agent is further added and kneaded. Thereby, the elution of Se and other heavy metals from the Se-containing ash can be reliably prevented.
Claims (5)
ことにより、該Ｓｅ含有灰からのＳｅの溶出を防止する
Ｓｅ含有灰の処理方法において、 該Ｓｅ含有灰にアルカリを添加して該Ｓｅ含有灰をｐＨ
１１以上とした後、ｐＨ１１以上を維持した状態で第一
鉄塩の添加、混練を行うことを特徴とするＳｅ含有灰の
処理方法。1. A method for treating a Se-containing ash, which comprises adding and kneading a ferrous salt to the Se-containing ash to prevent the elution of Se from the Se-containing ash, wherein an alkali is added to the Se-containing ash. The Se-containing ash to pH
A method for treating Se-containing ash, comprising adding and kneading a ferrous salt while maintaining a pH of 11 or higher after adjusting the pH to 11 or higher.
を添加、混練することにより、該Ｓｅ含有灰からのＳｅ
とその他の重金属類の溶出を防止するＳｅ含有灰の処理
方法において、 該Ｓｅ含有灰に第一鉄塩を添加、混練した後、重金属固
定剤を添加、混練する方法であって、 該Ｓｅ含有灰にアルカリを添加して該Ｓｅ含有灰をｐＨ
１１以上とした後、ｐＨ１１以上を維持した状態で第一
鉄塩の添加、混練と重金属固定剤の添加、混練を行うこ
とを特徴とするＳｅ含有灰の処理方法。2. A ferrous salt and a heavy metal fixing agent are added to and kneaded with Se-containing ash, whereby Se from the Se-containing ash is added.
A method for treating Se-containing ash that prevents the elution of water and other heavy metals, comprising adding and kneading a ferrous salt to the Se-containing ash, and then adding and kneading a heavy metal fixing agent. An alkali is added to the ash to adjust the Se-containing ash to pH.
11. A method for treating Se-containing ash, comprising adding ferrous salt, kneading and adding a heavy metal fixing agent and kneading while maintaining pH 11 or higher after adjusting the pH to 11 or higher.
化第一鉄及び／又は硫酸第一鉄であり、その添加量がＳ
ｅ含有灰１００重量部に対して５〜１００重量部である
ことを特徴とするＳｅ含有灰の処理方法。3. The ferrous salt according to claim 1, wherein the ferrous salt is ferrous chloride and / or ferrous sulfate, and
A method for treating Se-containing ash, wherein the amount is 5 to 100 parts by weight based on 100 parts by weight of e-containing ash.
がリン酸、リン酸塩、キレート剤、硫化ソーダ、水硫化
ソーダ及び硫化カルシウムよりなる群から選ばれる１種
又は２種以上であることを特徴とするＳｅ含有灰の処理
方法。4. The heavy metal fixing agent according to claim 2, wherein the heavy metal fixing agent is at least one member selected from the group consisting of phosphoric acid, phosphate, chelating agent, sodium sulfide, sodium hydrosulfide and calcium sulfide. A method for treating Se-containing ash, characterized in that:
て、アルカリが苛性ソーダ、苛性カリ、消石灰及びセメ
ントよりなる群から選ばれる１種又は２種以上であるこ
とを特徴とするＳｅ含有灰の処理方法。5. The treatment of Se-containing ash according to claim 1, wherein the alkali is at least one member selected from the group consisting of caustic soda, caustic potash, slaked lime and cement. Method.
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|---|---|---|---|
| JP2000062433A JP3831832B2 (en) | 2000-03-07 | 2000-03-07 | Se-containing ash treatment method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009028594A (en) * | 2007-07-25 | 2009-02-12 | Nihon Hels Industry Corp | Method of manufacturing granular product utilizing coal ash containing harmful chemical substance and granular product and resource material obtained thereby |
| JP2016169494A (en) * | 2015-03-12 | 2016-09-23 | 有限会社将楽産業 | Manufacturing method of recycled civil engineering material, and recycled civil engineering material |
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|---|---|---|---|---|
| JP5652293B2 (en) * | 2011-03-29 | 2015-01-14 | 栗田工業株式会社 | Method for processing heavy metal-containing solids |
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2000
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009028594A (en) * | 2007-07-25 | 2009-02-12 | Nihon Hels Industry Corp | Method of manufacturing granular product utilizing coal ash containing harmful chemical substance and granular product and resource material obtained thereby |
| JP2016169494A (en) * | 2015-03-12 | 2016-09-23 | 有限会社将楽産業 | Manufacturing method of recycled civil engineering material, and recycled civil engineering material |
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