JP2000167512A - One component heavy metal fixing agent - Google Patents
One component heavy metal fixing agentInfo
- Publication number
- JP2000167512A JP2000167512A JP10343066A JP34306698A JP2000167512A JP 2000167512 A JP2000167512 A JP 2000167512A JP 10343066 A JP10343066 A JP 10343066A JP 34306698 A JP34306698 A JP 34306698A JP 2000167512 A JP2000167512 A JP 2000167512A
- Authority
- JP
- Japan
- Prior art keywords
- heavy metal
- fixing agent
- iron
- salt
- metal fixing
- 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.)
- Granted
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- Processing Of Solid Wastes (AREA)
- Fire-Extinguishing Compositions (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は重金属固定化剤に係
り、特に、焼却煤塵、主灰、溶融媒塵などの都市ゴミや
産業廃棄物の焼却灰ないし飛灰、シュレッダーダスト、
廃水処理に伴なって発生する汚泥、鉱滓、汚染土壌など
の重金属含有廃棄物、とりわけ、重金属含有灰や重金属
汚染土壌を容易かつ効率的に処理して、処理物からの重
金属の溶出を確実に防止する一液型重金属固定化剤に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heavy metal fixing agent, and more particularly, to incinerated ash or fly ash of city waste such as incinerated dust, main ash, melting medium dust and industrial waste, shredder dust, and the like.
Easily and efficiently treat heavy metal-containing waste such as sludge, slag, and contaminated soil generated during wastewater treatment, especially heavy metal-containing ash and heavy metal-contaminated soil, to ensure elution of heavy metals from the treated material. The present invention relates to a one-pack type heavy metal fixing agent to be prevented.
【０００２】[0002]
【従来の技術】都市ゴミや産業廃棄物を焼却プラントで
焼却した際に発生する焼却灰や飛灰には、鉛、カドミウ
ム、水銀、クロム、セレン、ヒ素、アンチモンなどの重
金属類が多量に含まれている。特に、飛灰中には鉛、カ
ドミウム、アンチモン、ヒ素が多く含有されている。2. Description of the Related Art The incineration ash and fly ash generated when municipal garbage and industrial waste are incinerated at incineration plants contain large amounts of heavy metals such as lead, cadmium, mercury, chromium, selenium, arsenic, and antimony. Have been. In particular, fly ash contains a large amount of lead, cadmium, antimony, and arsenic.
【０００３】これらの重金属含有灰は、埋立て、地盤工
事等に有効利用されるか、或いは廃棄処分されるが、重
金属を含むことから、重金属含有灰の有効利用又は廃棄
に当っては、含有される重金属の溶出を防止する処理を
施す必要がある。[0003] These heavy metal-containing ashes are effectively used for landfills, ground works, and the like, or are disposed of. However, since they contain heavy metals, they are not used for effective use or disposal of heavy metal-containing ash. It is necessary to perform a treatment for preventing the elution of heavy metals.
【０００４】また、シュレッダーダストや廃水処理工程
で発生する汚泥、鉱滓、汚染土壌にも重金属が含まれて
いることから、これらの廃棄に当っては、含有される重
金属の溶出を防止する処理を施す必要がある。[0004] Further, since sludge, slag, and contaminated soil generated in the shredder dust and wastewater treatment processes also contain heavy metals, a treatment for preventing the elution of the heavy metals contained in these wastes is required. Need to be applied.
【０００５】従来、重金属含有廃棄物の重金属溶出防止
方法としては、溶融法、セメント固化法、酸或いはその
他の溶媒による抽出法、薬剤処理法などが提案されてい
るが、設備、運転管理、処理コスト等の面から薬剤処理
法が注目されている。Conventionally, as a method for preventing heavy metal-containing waste from eluting heavy metals, a melting method, a cement solidification method, an extraction method using an acid or other solvent, a chemical treatment method, and the like have been proposed. Attention has been paid to the drug treatment method from the viewpoint of cost and the like.
【０００６】薬剤処理法としては、水溶性リン酸又はそ
の塩を重金属含有灰に添加する方法（特公平４−６１７
１０号公報）、ジチオカルバミン酸を主成分とするキレ
ート系重金属固定化剤を重金属含有灰に添加する方法な
どが提案されているが、これらの方法は、鉛及びカドミ
ウムに対する固定効果は高く、これらの溶出を防止でき
るが、アンチモンやヒ素に対する固定効果は乏しく、ア
ンチモンやヒ素の溶出を防止し得ないという問題点があ
った。As a chemical treatment method, a method of adding water-soluble phosphoric acid or a salt thereof to heavy metal-containing ash (Japanese Patent Publication No. 4-617).
No. 10), a method of adding a chelating heavy metal fixing agent containing dithiocarbamic acid as a main component to a heavy metal-containing ash has been proposed, but these methods have a high fixing effect on lead and cadmium, and these methods have a high effect. Although elution can be prevented, there is a problem that the effect of fixing antimony and arsenic is poor and elution of antimony and arsenic cannot be prevented.
【０００７】これに対して、鉛、カドミウム、ヒ素など
を固定できる重金属固定化剤として、水溶性リン酸又は
その塩と二価の鉄化合物とを併用するものが提案されて
いる（特開平１０−１２８２７３号公報）。On the other hand, as a heavy metal fixing agent capable of fixing lead, cadmium, arsenic, etc., a combination of water-soluble phosphoric acid or a salt thereof and a divalent iron compound has been proposed (Japanese Patent Application Laid-Open No. Hei 10 (1998)). -128273).
【０００８】その他、リン化合物と鉄化合物とを併用す
る重金属固定化剤としては、リン酸塩と三価の鉄塩物と
を含む粉体状重金属固定化剤（特開平９−２４８４５０
号公報）やリン酸（塩）と二価の鉄塩物とを含む重金属
固定化剤（特開平９−２９９９０５号公報）が提案され
ている。In addition, as a heavy metal fixing agent using a phosphorus compound and an iron compound together, a powdery heavy metal fixing agent containing a phosphate and a trivalent iron salt (JP-A-9-248450)
JP-A-9-299905) and a heavy metal fixing agent containing phosphoric acid (salt) and a divalent iron salt.
【０００９】[0009]
【発明が解決しようとする課題】上記従来のリン酸化合
物／鉄塩系重金属固定化剤のうち、特開平９−２４８４
５０号公報に記載されるものは、粉末状であり、液状と
することはもとより、液状化した場合の安定性について
の考慮は全くなされていないが、このような粉体状重金
属固定化剤では、補充等の取り扱いの際の薬剤飛散の問
題がある。Among the above-mentioned conventional phosphoric acid compound / iron salt-based heavy metal fixing agents, JP-A-9-2484
No. 50 is in the form of a powder, which is in the form of a liquid. In addition to the fact that no consideration is given to the stability in the case of liquefaction, such a powdery heavy metal fixing agent is used. In addition, there is a problem of scattering of the medicine when handling such as replenishment.
【００１０】重金属固定化処理における薬剤の取り扱い
性を考慮した場合、薬剤は液状であることが、更には薬
剤注入操作の簡便化のためには一液型薬剤であることが
望まれるが、二価の鉄塩を用いた重金属固定化剤では、
リン化合物と共に一液化した状態で保存すると結晶（固
体状物質）が析出ないし沈殿し、これにより薬注ポンプ
や散布ノズルの閉塞が起き、注入、散布が困難ないし不
可能になるという欠点があった。[0010] Considering the handling properties of the drug in the heavy metal immobilization treatment, it is desired that the drug is in a liquid state, and it is desirable that the drug be a one-pack type drug in order to simplify the drug injection operation. In heavy metal immobilizing agents using valent iron salts,
When stored in a liquid state together with the phosphorus compound, crystals (solid substances) precipitate or precipitate, which causes clogging of a chemical injection pump or a spray nozzle, which makes it difficult or impossible to inject or spray. .
【００１１】本発明は、上記従来の問題点を解決し、
鉛、カドミウムだけでなく、ヒ素やアンチモンなどの重
金属の溶出を確実に防止することができるリン化合物／
鉄塩系重金属固定化剤であって、結晶の析出の問題がな
く、保存安定性に優れた一液型重金属固定化剤を提供す
ることを目的とする。The present invention solves the above conventional problems,
Phosphorus compounds that can reliably prevent the elution of heavy metals such as arsenic and antimony as well as lead and cadmium /
An object of the present invention is to provide a one-part heavy metal fixing agent which is an iron salt-based heavy metal fixing agent, which has no problem of crystal precipitation and has excellent storage stability.
【００１２】[0012]
【課題を解決するための手段】本発明の一液型重金属固
定化剤には、リン酸化合物５〜５０重量％（ＰＯ4とし
て）と、三価の鉄塩１〜１５重量％（Ｆｅとして）と、
水２０〜９４重量％とを含有することを特徴とする。The one-part heavy metal immobilizing agent of the present invention solving the problem to means for the ## phosphate compound 5-50% by weight (as PO 4), as trivalent iron salt 1-15 wt% (Fe )When,
20 to 94% by weight of water.
【００１３】本発明の重金属固定剤は、リン化合物と鉄
塩とを含むため、鉛、カドミウムの他、ヒ素、アンチモ
ンなどの重金属をも効果的に固定化してその溶出を確実
に防止することができる。このリン化合物と鉄塩との併
用による重金属固定機構の詳細は明らかではないが、次
のように推定される。Since the heavy metal fixing agent of the present invention contains a phosphorus compound and an iron salt, it can effectively immobilize not only lead and cadmium but also heavy metals such as arsenic and antimony to prevent the elution thereof. it can. The details of the heavy metal fixing mechanism by the combined use of the phosphorus compound and the iron salt are not clear, but are presumed as follows.
【００１４】即ち、鉄塩は、これを添加することにより
生成する水酸化鉄が、アンチモンやヒ素などの重金属と
難溶性の塩を形成して共沈することによりこれらを固定
化する。また、リン化合物は、重金属含有廃棄物中の鉛
とカドミウムを固定化すると共に、鉄塩と相互作用し、
重金属固定化能を強める。That is, the iron salt is immobilized by the coprecipitation of iron hydroxide produced by the addition of the salt to form a hardly soluble salt with heavy metals such as antimony and arsenic. In addition, the phosphorus compound immobilizes lead and cadmium in heavy metal-containing waste and interacts with iron salts,
Improve heavy metal immobilization ability.
【００１５】本発明の一液型重金属固定化剤が、液状の
一液製剤としても結晶の析出が起こらず、保存安定性に
優れることの理由の詳細は明らかではないが、一般に三
価の鉄塩は二価の鉄塩に比べて結晶化し難く、また、本
発明では、このような三価の鉄塩と共に、リン化合物を
特定の濃度で配合するために、結晶化が抑制され、一液
型液状薬剤が安定するものと考えられる。Although the details of the reason why the one-pack type heavy metal fixing agent of the present invention does not cause precipitation of crystals even when used as a liquid one-pack preparation and has excellent storage stability are not clear, generally, trivalent iron is generally used. Salts are less likely to crystallize than divalent iron salts, and in the present invention, a phosphorus compound is added at a specific concentration together with such a trivalent iron salt, so that crystallization is suppressed, and It is thought that the mold liquid drug is stable.
【００１６】[0016]
【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.
【００１７】本発明においては、リン化合物と三価の鉄
塩とを水に溶解して一液製剤とする。In the present invention, a phosphorus compound and a trivalent iron salt are dissolved in water to form a one-part preparation.
【００１８】リン化合物としては、リン酸又はその塩が
用いられ、このうち、リン酸としては正リン酸や次亜リ
ン酸、メタ亜リン酸、ピロ亜リン酸、正亜リン酸、次リ
ン酸、メタリン酸、ピロリン酸、三リン酸、縮合リン酸
が挙げられ、リン酸塩としては、これらのリン酸の塩、
第一リン酸塩、第二リン酸塩が挙げられる。As the phosphorus compound, phosphoric acid or a salt thereof is used. Among them, phosphoric acid includes orthophosphoric acid, hypophosphorous acid, metaphosphorous acid, pyrophosphorous acid, orthophosphorous acid, hypophosphorous acid, and the like. Acid, metaphosphoric acid, pyrophosphoric acid, triphosphoric acid, condensed phosphoric acid, and as the phosphate, salts of these phosphoric acids,
Primary phosphate and secondary phosphate are mentioned.
【００１９】本発明においては、特に水溶性の高いリン
化合物が好ましく、特に正リン酸（Ｈ3ＰＯ4）、リン酸
二水素一ナトリウム（ＮａＨ2ＰＯ4）、リン酸一水素二
ナトリウム（Ｎａ2ＨＰＯ4）、縮合リン酸等を好適に使
用することができる。In the present invention, phosphorus compounds having high water solubility are particularly preferred, and orthophosphoric acid (H 3 PO 4 ), monosodium dihydrogen phosphate (NaH 2 PO 4 ), disodium monohydrogen phosphate (Na) are particularly preferred. 2 HPO 4 ), condensed phosphoric acid and the like can be suitably used.
【００２０】三価の鉄塩、即ち、第二鉄塩としては、入
手のし易さから、硫酸第二鉄（III）、塩化第二鉄（II
I）、ポリ硫酸鉄（III）等を好適に使用することができ
る。As the trivalent iron salt, ie, ferric salt, ferric sulfate (III), ferric chloride (II)
I), iron (III) polysulfate and the like can be suitably used.
【００２１】なお、本発明の一液型重金属固定化剤で
は、薬剤の安定性を損なわない範囲で二価の鉄塩を含有
しても良く、この場合、二価の鉄塩としては、塩化第一
鉄（II）、硫酸第一鉄（II）等が挙げられる。The one-part heavy metal fixing agent of the present invention may contain a divalent iron salt as long as the stability of the drug is not impaired. In this case, the divalent iron salt may be chloride. Ferrous (II), ferrous sulfate (II) and the like.
【００２２】本発明の一液型重金属固定化剤において、
リン化合物、三価の鉄塩及び水の含有量は、リン化合物
（ＰＯ4換算）：５〜５０重量％、好ましくは１０〜４
５重量％、三価の鉄塩（Ｆｅ換算）：１〜１５重量％、
好ましくは３〜１０重量％、水：２０〜９４重量％、好
ましくは４０〜９４重量％である。In the one-pack type heavy metal fixing agent of the present invention,
The content of the phosphorus compound, trivalent iron salt and water is phosphorus compound (PO 4 conversion): 5 to 50% by weight, preferably 10 to 4 %.
5% by weight, trivalent iron salt (Fe equivalent): 1 to 15% by weight,
Preferably it is 3 to 10% by weight, water: 20 to 94% by weight, preferably 40 to 94% by weight.
【００２３】リン化合物含有量（ＰＯ4換算）が５重量
％未満であっても５０重量％を超えても結晶の析出の問
題があり、良好な保存安定性を得ることができない。三
価の鉄塩含有量（Ｆｅ換算）が１重量％未満では、鉄塩
を併用することによる重金属固定化効果の向上作用を得
ることができず、１５重量％を超えると結晶の析出の問
題があり、良好な保存安定性を得ることができない。If the phosphorus compound content (in terms of PO 4 ) is less than 5% by weight or more than 50% by weight, there is a problem of crystal precipitation, and good storage stability cannot be obtained. If the content of trivalent iron salt (in terms of Fe) is less than 1% by weight, the effect of improving the effect of fixing heavy metals by using the iron salt in combination cannot be obtained. And good storage stability cannot be obtained.
【００２４】このような本発明の一液型重金属固定化剤
は、重金属含有廃棄物１００重量部に対して、次のよう
な量で添加して処理するのが好ましい。The one-pack type heavy metal fixing agent of the present invention is preferably added to the heavy metal-containing waste in an amount of 100 wt.
【００２５】重金属含有飛灰・焼却灰に対して：０．５
〜５０重量部、特に５〜１５重量部 重金属含有土壌に対して：０．０５〜５０重量部、特に
０．５〜１５重量部 このような本発明のリン化合物／鉄塩系重金属固定化剤
は、マグネシウム化合物及び／又はカルシウム化合物と
共に用いることが好ましい。即ち、マグネシウム化合
物、カルシウム化合物は、本発明の重金属固定化剤と共
にアパタイトを生成して鉛、カドミウムを取り込んだ安
定な結晶を生成すると共に、鉄塩から生成する水酸化鉄
と相互作用して水酸化鉄の重金属共沈作用を強める。ま
た、水酸化マグネシウムと水酸化カルシウムは、ｐＨ調
整剤としても作用し、処理物の溶出液ｐＨをｐＨ８〜１
２に保持することで、安定した重金属固定化処理を可能
とする。For fly ash and incinerated ash containing heavy metals: 0.5
50 to 50 parts by weight, especially 5 to 15 parts by weight For heavy metal-containing soil: 0.05 to 50 parts by weight, especially 0.5 to 15 parts by weight Such a phosphorus compound / iron salt-based heavy metal fixing agent of the present invention. Is preferably used together with a magnesium compound and / or a calcium compound. That is, the magnesium compound and the calcium compound form apatite together with the heavy metal fixing agent of the present invention to form stable crystals incorporating lead and cadmium, and interact with iron hydroxide generated from an iron salt to form water. Intensifies the heavy metal coprecipitation of iron oxide. Further, magnesium hydroxide and calcium hydroxide also act as pH adjusters, and adjust the pH of the eluate of the treated product to pH 8 to 1.
Holding at 2 enables stable heavy metal immobilization treatment.
【００２６】この場合、カルシウム化合物、マグネシウ
ム化合物としては、特に制限はなく、市販されている水
酸化カルシウム、塩化カルシウム等のカルシウム化合
物、水酸化マグネシウム、塩化マグネシウム等のマグネ
シウム化合物を用いることができる。カルシウム化合
物、マグネシウム化合物として水酸化物を用いた場合に
は、同時にｐＨ調整を行うこともできるが、水酸化カル
シウムを過剰に添加した場合には、処理物の溶出液のｐ
Ｈが高くなり（ｐＨ１２以上）、鉛が溶出するおそれが
あるので、水酸化カルシウムを用いる場合には、塩化カ
ルシウム等の他のカルシウム化合物と組み合わせ、ｐＨ
が適当な値となるように調整するのが好ましい。一方、
水酸化マグネシウムでは処理物の溶出液のｐＨは９．５
〜１０で安定するため、鉛が溶出するおそれは少ない。In this case, the calcium compound and the magnesium compound are not particularly limited, and commercially available calcium compounds such as calcium hydroxide and calcium chloride, and magnesium compounds such as magnesium hydroxide and magnesium chloride can be used. When a hydroxide is used as the calcium compound and the magnesium compound, the pH can be adjusted at the same time. However, when calcium hydroxide is excessively added, the pH of the eluate of the treated product is reduced.
Since H becomes high (pH 12 or more) and lead may be eluted, when calcium hydroxide is used, it is combined with other calcium compounds such as calcium chloride,
Is preferably adjusted to an appropriate value. on the other hand,
With magnesium hydroxide, the pH of the eluate of the treated product is 9.5.
Since it is stable at 10 to 10, lead is less likely to elute.
【００２７】本発明において、これらのカルシウム化合
物及び／又はマグネシウム化合物の添加量は、重金属含
有廃棄物が重金属含有飛灰、焼却灰の場合には、これら
の重金属含有灰に対して１〜２０重量％、重金属を含有
する汚染土壌である場合には、重金属含有汚染土壌に対
して０．１〜５０重量％とするのが好ましい。In the present invention, when the heavy metal-containing waste is heavy metal-containing fly ash or incinerated ash, the amount of the calcium compound and / or magnesium compound to be added is 1 to 20% by weight based on the heavy metal-containing ash. %, In the case of contaminated soil containing heavy metals, the content is preferably 0.1 to 50% by weight based on the contaminated soil containing heavy metals.
【００２８】なお、カルシウム化合物及び／又はマグネ
シウム化合物は、粉体として添加しても、スラリーや水
溶液として添加してもよい。The calcium compound and / or magnesium compound may be added as a powder, a slurry or an aqueous solution.
【００２９】本発明においては、重金属含有廃棄物に、
本発明の一液型重金属固定化剤と、必要に応じてカルシ
ウム化合物及び／又はマグネシウム化合物の他、更に別
途水を添加しても良い。この場合、処理物の含水率によ
り処理効果に差が生じることはないことから、取り扱い
性や作業性の面から、水の添加量を適宜調整すれば良
く、一般的には、重金属含有廃棄物に添加する水の総
量、即ち、一液型重金属固定化剤中の水、カルシウム化
合物及び／又はマグネシウム化合物をスラリーとして添
加する場合のスラリー中の水及び別途添加する水の合計
量が重金属含有廃棄物に対して１０〜６０重量％となる
ようにするのが好ましい。In the present invention, heavy metal-containing waste is
In addition to the one-component heavy metal fixing agent of the present invention and, if necessary, a calcium compound and / or a magnesium compound, water may be added separately. In this case, since there is no difference in the treatment effect depending on the water content of the treated product, the amount of water added may be appropriately adjusted from the viewpoint of handleability and workability. The total amount of water to be added to the wastewater, that is, the total amount of water in the one-pack type heavy metal fixing agent, the water in the slurry when the calcium compound and / or the magnesium compound is added as a slurry, and the water to be added separately is heavy metal-containing waste. It is preferable that the content be 10 to 60% by weight based on the weight of the product.
【００３０】本発明において、重金属含有廃棄物への、
本発明の一液型重金属固定化剤、カルシウム化合物及び
／又はマグネシウム化合物、水の添加順の違いによる処
理効果の差はなく、本発明では、重金属含有廃棄物に水
を添加した後、本発明の一液型重金属固定化剤とカルシ
ウム化合物及び／又はマグネシウム化合物とを添加して
も良く、また、これらを同時に添加しても良いが、同時
添加の場合であっても、一液型重金属固定化剤とカルシ
ウム化合物及び／又はマグネシウム化合物とは、瞬時に
反応し、析出物が生成するため、薬注に不具合が生じ
る、リン酸と鉄がカルシウム、マグネシウムに消費され
るため、重金属固定化効果が悪くなるなどの点から、本
発明の一液型重金属固定化剤と、カルシウム化合物及び
／又はマグネシウム化合物とは、予め混合することな
く、別々に添加するのが好ましい。In the present invention, the heavy metal-containing waste
There is no difference in the treatment effect due to the difference in the order of addition of the one-pack type heavy metal fixing agent of the present invention, the calcium compound and / or the magnesium compound, and the water. In the present invention, after adding water to the heavy metal-containing waste, the present invention One-part heavy metal fixing agent and a calcium compound and / or a magnesium compound may be added, and these may be added simultaneously. The agent and the calcium compound and / or the magnesium compound react instantaneously to form a precipitate, which causes inconvenience in chemical injection. Since phosphoric acid and iron are consumed by calcium and magnesium, the effect of immobilizing heavy metals is obtained. For example, the one-component heavy metal fixing agent of the present invention and the calcium compound and / or the magnesium compound are separately added without being mixed in advance. Preferred.
【００３１】なお、本発明においては、従来の重金属固
定化剤を併用添加することもでき、この場合、併用でき
る重金属固定化剤としては、キレート系重金属固定化
剤、活性白土のような粘土鉱物系重金属固定化剤、澱粉
のような高分子化合物系重金属固化剤、セメント系重金
属固定化剤、チタン系重金属固定化剤などが挙げられ
る。In the present invention, a conventional heavy metal fixing agent can also be added in combination. In this case, the heavy metal fixing agent that can be used in combination is a chelating heavy metal fixing agent or a clay mineral such as activated clay. Heavy metal-fixing agents, polymer-based heavy metal-fixing agents such as starch, cement-based heavy metal-fixing agents, titanium-based heavy metal-fixing agents, and the like.
【００３２】本発明の一液型重金属固定化剤により重金
属含有飛灰や焼却灰を処理する場合には、これらの重金
属含有灰に、本発明の一液型重金属固定化剤、必要に応
じて更にカルシウム化合物及び／又はマグネシウム化合
物と水を添加して混練すればよく、これにより、比較的
少量の薬剤添加量で重金属の固定が可能となり、重金属
の溶出の問題が殆どない混練物が得られる。この混練物
は、通常の場合、埋立処分される。When the heavy metal-containing fly ash or incinerated ash is treated with the one-part heavy metal fixing agent of the present invention, the one-part heavy metal fixing agent of the present invention may be added to these heavy metal-containing ash, if necessary. Further, the calcium compound and / or the magnesium compound and water may be added and kneaded, whereby the fixation of heavy metals becomes possible with a relatively small amount of drug added, and a kneaded material having almost no problem of elution of heavy metals is obtained. . This kneaded material is usually disposed of in landfill.
【００３３】また、重金属を含有する汚染土壌を処理す
る場合には、例えば予めボーリング調査等により、重金
属類で汚染された土壌の範囲や濃度分布を調べておくの
が良く、この結果に基いて、重金属類の汚染が地表付近
の土壌のみである場合には、本発明の一液型重金属固定
化剤と、必要に応じて更にカルシウム化合物及び／又は
マグネシウム化合物、水を直接地表に向けて散布すれば
良い。また、汚染がある程度地中の深い部分にまで達し
ている場合には、その汚染領域に達するように、数カ所
掘削して、汚染部分に本発明の一液型重金属固定化剤
と、必要に応じてカルシウム化合物及び／又はマグネシ
ウム化合物と水とを、これらが地中で接触するように掘
削穴から散布するか、土壌を採り出して混練機などで混
合し再度埋め戻すようにすればよい。When treating contaminated soil containing heavy metals, the range and concentration distribution of the soil contaminated with heavy metals may be examined in advance by, for example, a boring survey. When heavy metals are contaminated only in the soil near the ground surface, the one-pack type heavy metal fixing agent of the present invention and, if necessary, a calcium compound and / or a magnesium compound and water are sprayed directly to the ground surface. Just do it. When the contamination reaches a deep part of the ground to some extent, excavation is performed at several places to reach the contaminated area, and the one-part heavy metal fixing agent of the present invention is added to the contaminated part, if necessary. Then, the calcium compound and / or magnesium compound and water may be sprayed from an excavation hole so that they come into contact with the ground, or the soil may be taken out, mixed with a kneader or the like, and backfilled.
【００３４】[0034]
【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.
【００３５】実施例１〜５、比較例１〜４ 正リン酸水溶液（７５重量％asＰＯ4）と鉄塩水溶液を
用いて表１に示す薬剤を調製し、−５℃と室温（約２５
℃）でそれぞれ放置し、外観を観察することにより経時
安定性を調べ、結果を表１に示した。[0035] Examples 1-5, the agent shown in Table 1 with Comparative Examples 1 to 4 orthophosphoric acid aqueous solution (75 wt% ASPO 4) iron salt aqueous solution was prepared, -5 ° C. and room temperature (about 25
C), and the stability over time was examined by observing the appearance. The results are shown in Table 1.
【００３６】[0036]
【表１】 [Table 1]
【００３７】表１より明らかなように、二価の鉄塩を用
いた比較例１、リン酸の濃度が５０重量％を超える比較
例２及び５重量％未満の比較例３、三価の鉄塩が１５重
量％を超える比較例４では、１０日後に結晶が析出した
のに対し、三価の鉄塩を用い、かつリン酸濃度５〜５０
重量％で鉄塩濃度０．１〜１５重量％の実施例１〜５で
は４０日後にも結晶は析出せず、保存安定性に優れてい
た。As apparent from Table 1, Comparative Example 1 using a divalent iron salt, Comparative Example 2 in which the concentration of phosphoric acid exceeds 50% by weight, Comparative Example 3 in which the concentration of phosphoric acid is less than 5% by weight, and trivalent iron In Comparative Example 4 in which the salt exceeded 15% by weight, crystals were precipitated after 10 days, whereas a trivalent iron salt was used and the phosphoric acid concentration was 5 to 50%.
In Examples 1 to 5 in which the iron salt concentration was 0.1 to 15% by weight in terms of% by weight, no crystals were precipitated even after 40 days, and the storage stability was excellent.
【００３８】実施例６、比較例５ 実施例５及び比較例１の薬剤を用い、図１に示す処理装
置により産業廃棄物焼却飛灰（成分分析値を表２に示
す。）の処理を行った。Example 6, Comparative Example 5 Using the chemicals of Example 5 and Comparative Example 1, the processing apparatus shown in FIG. 1 was used to treat incinerated fly ash from industrial waste (component analysis values are shown in Table 2). Was.
【００３９】[0039]
【表２】 [Table 2]
【００４０】図１に示す処理装置は、集塵装置（図示せ
ず）で捕集された煤塵を搬送コンベア１で搬送して一旦
サイロ２に貯留し、サイロ２の下部より定量的に排出し
て混練機３に供給すると共に、重金属固定化剤タンク４
及び希釈水タンク５からそれぞれ重金属固定化剤及び水
を定量的に供給し、十分混練した後、養生コンベア６で
ピット７に搬送して処理物を貯留するものである。The processing apparatus shown in FIG. 1 conveys dust collected by a dust collector (not shown) by a conveyor 1 and temporarily stores it in a silo 2, and quantitatively discharges the dust from a lower portion of the silo 2. To the kneading machine 3 and the heavy metal fixing agent tank 4
After the heavy metal fixing agent and water are quantitatively supplied from the diluting water tank 5 and sufficiently kneaded, the mixture is transported to the pit 7 by the curing conveyor 6 to store the processed material.
【００４１】薬剤及び水の添加量は、煤塵１００重量部
に対して重金属固定化剤１０重量部、水１０重量部と
し、薬剤調製後１週間後と、１ヶ月後において、それぞ
れサイロ２及びピット７から処理前の煤塵と処理灰とを
採取して、環境庁告示１３号に準じて溶出試験を行い、
結果を表３に示した。The addition amounts of the chemical and water were 10 parts by weight of the heavy metal fixing agent and 10 parts by weight of water with respect to 100 parts by weight of the dust. One week and one month after the preparation of the chemical, the silo 2 and the pit were used, respectively. The dust and treated ash before treatment were collected from 7 and subjected to a dissolution test according to the Environment Agency Notification No. 13.
The results are shown in Table 3.
【００４２】なお、重金属固定化剤タンク４の設置場所
の環境温度は約２０〜２５℃であった。The environmental temperature of the place where the heavy metal fixing agent tank 4 was installed was about 20 to 25 ° C.
【００４３】[0043]
【表３】 [Table 3]
【００４４】表３より明らかなように、比較例１の薬剤
を用いた比較例５では、薬剤調製後１ヶ月経過したとき
に、処理灰の重金属溶出量が増大した。このとき、薬注
ポンプを点検したところ、目詰まりを起こしており、薬
剤が適正に注入されていなかった。As is clear from Table 3, in Comparative Example 5 using the drug of Comparative Example 1, the amount of heavy metal eluted from the treated ash increased one month after the preparation of the drug. At this time, inspection of the chemical injection pump revealed that the chemical injection pump was clogged, and the chemical was not properly injected.
【００４５】これに対して、実施例５の薬剤を用いた実
施例６では、安定した薬注を行うことができたため、１
ヶ月経過後も重金属の溶出はなく、安定して処理するこ
とができた。On the other hand, in Example 6 using the drug of Example 5, stable drug injection could be performed.
Even after a lapse of months, there was no elution of heavy metals, and stable treatment was possible.
【００４６】[0046]
【発明の効果】以上詳述した通り、本発明の一液型重金
属固定化剤によれば、 重金属含有灰や重金属含有土壌等の重金属含有廃棄
物を効果的に処理して、処理物からの鉛、カドミウム、
アンチモン、ヒ素等の重金属の溶出を確実に防止するこ
とができる。 液状であるため、飛散などの問題がなく取り扱い性
に優れる。 固体状物質の析出の問題のない長期保存安定性に優
れた一液製剤であるため、配管やポンプの閉塞を引き起
こすことなく、安定に供給することができ、また、土壌
等に散布する場合にもノズル等の目詰まりを引き起こす
ことがない。といった効果を奏し、処理効果及び取り扱
い性に優れた一液型重金属固定化剤が提供される。As described above in detail, according to the one-pack type heavy metal fixing agent of the present invention, heavy metal-containing waste such as heavy metal-containing ash and heavy metal-containing soil is effectively treated, and Lead, cadmium,
Elution of heavy metals such as antimony and arsenic can be reliably prevented. Since it is a liquid, there is no problem such as scattering, and the handleability is excellent. Because it is a one-part preparation with excellent long-term storage stability that does not have the problem of precipitation of solid substances, it can be supplied stably without causing clogging of pipes and pumps, and when sprayed on soil, etc. Also does not cause clogging of the nozzle or the like. Thus, a one-pack type heavy metal fixing agent excellent in processing effect and handleability is provided.
【図１】実施例６及び比較例５で用いた薬剤処理装置を
示す系統図である。FIG. 1 is a system diagram showing a medicine processing apparatus used in Example 6 and Comparative Example 5.
１ 搬送コンベア ２ サイロ ３ 混練機 ４ 重金属固定化剤タンク ５ 希釈水タンク ６ 養生コンベア ７ ピット DESCRIPTION OF SYMBOLS 1 Conveyor 2 Silo 3 Kneader 4 Heavy metal fixing agent tank 5 Dilution water tank 6 Curing conveyor 7 Pit
───────────────────────────────────────────────────── フロントページの続き (72)発明者 伊藤 一郎 東京都新宿区西新宿三丁目４番７号 栗田 工業株式会社 (72)発明者 内田 敏仁 東京都新宿区西新宿三丁目４番７号 栗田 工業株式会社 Ｆターム(参考） 2E191 BA02 BB00 BB01 BC01 4D004 AA02 AA36 AA37 AA41 AA43 AB03 BA02 CA34 CC03 CC11 DA03 DA10 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Ichiro Ito 3-4-7 Nishishinjuku, Shinjuku-ku, Tokyo Kurita Kogyo Co., Ltd. (72) Inventor Toshihito Uchida 3-4-2 Nishishinjuku, Shinjuku-ku, Tokyo Kurita Industrial Co., Ltd. F-term (reference) 2E191 BA02 BB00 BB01 BC01 4D004 AA02 AA36 AA37 AA41 AA43 AB03 BA02 CA34 CC03 CC11 DA03 DA10
Claims (1)
して）と、三価の鉄塩１〜１５重量％（Ｆｅとして）
と、水２０〜９４重量％とを含有することを特徴とする
一液型重金属固定化剤。1. A phosphoric acid compound of 5 to 50% by weight (as PO 4 ) and a trivalent iron salt of 1 to 15% by weight (as Fe)
And a 20-94% by weight of water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34306698A JP3419330B2 (en) | 1998-12-02 | 1998-12-02 | One-component heavy metal fixing agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34306698A JP3419330B2 (en) | 1998-12-02 | 1998-12-02 | One-component heavy metal fixing agent |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000167512A true JP2000167512A (en) | 2000-06-20 |
| JP3419330B2 JP3419330B2 (en) | 2003-06-23 |
Family
ID=18358679
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34306698A Expired - Fee Related JP3419330B2 (en) | 1998-12-02 | 1998-12-02 | One-component heavy metal fixing agent |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3419330B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002233858A (en) * | 2001-02-09 | 2002-08-20 | Dowa Mining Co Ltd | Detoxification method for heavy metal contaminated soil |
| JP2004314058A (en) * | 2003-03-28 | 2004-11-11 | Miyoshi Oil & Fat Co Ltd | Treatment method for waste |
| JP2009072657A (en) * | 2007-09-19 | 2009-04-09 | Jikco Ltd | Method for treating heavy metals in soil or soil slurry |
| US7714182B2 (en) * | 2005-07-27 | 2010-05-11 | Technische Universiteit Delft | Method for treating bottom ash |
-
1998
- 1998-12-02 JP JP34306698A patent/JP3419330B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002233858A (en) * | 2001-02-09 | 2002-08-20 | Dowa Mining Co Ltd | Detoxification method for heavy metal contaminated soil |
| JP2004314058A (en) * | 2003-03-28 | 2004-11-11 | Miyoshi Oil & Fat Co Ltd | Treatment method for waste |
| US7714182B2 (en) * | 2005-07-27 | 2010-05-11 | Technische Universiteit Delft | Method for treating bottom ash |
| JP2009072657A (en) * | 2007-09-19 | 2009-04-09 | Jikco Ltd | Method for treating heavy metals in soil or soil slurry |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3419330B2 (en) | 2003-06-23 |
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