JPH0679254A - Treating method to make fly ash harmless - Google Patents
Treating method to make fly ash harmlessInfo
- Publication number
- JPH0679254A JPH0679254A JP5197028A JP19702893A JPH0679254A JP H0679254 A JPH0679254 A JP H0679254A JP 5197028 A JP5197028 A JP 5197028A JP 19702893 A JP19702893 A JP 19702893A JP H0679254 A JPH0679254 A JP H0679254A
- Authority
- JP
- Japan
- Prior art keywords
- fly ash
- diethylenetriamine
- dithiocarboxy
- parts
- water
- 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.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、都市ゴミや産業廃棄物
などの焼却プラントから排ガスとともに排出される灰
分、たとえば電気集塵機で捕集されたＥＰ灰や、バグフ
ィルターで捕集された灰分など（以下、本明細書では
「飛灰」と略称する。）を無害化する処理方法に関する
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to ash discharged together with exhaust gas from an incinerator plant such as municipal waste and industrial waste, for example, EP ash collected by an electric dust collector, ash collected by a bag filter, etc. (Hereinafter, it is abbreviated as "fly ash" in the present specification.) The present invention relates to a treatment method for detoxifying.
【０００２】[0002]
【従来の技術】都市ゴミや産業廃棄物などの飛灰には、
人体に有害な重金属類が多量に含まれており、特に鉛、
カドミウム、水銀等は、飛灰の処分地において雨水など
による溶出が問題とされている。そのため、雨水による
流出対策として、飛灰にセメントと水を添加して混練、
固化する方法や、飛灰に含まれる重金属を酸によって抽
出し、飛灰を無害化する方法等が行われている。[Prior Art] Fly ash such as municipal waste and industrial waste,
It contains a large amount of heavy metals that are harmful to the human body, especially lead,
Dissolution of cadmium, mercury, etc. due to rainwater at the fly ash disposal site is a problem. Therefore, as a measure against runoff due to rainwater, cement and water are added to fly ash and kneaded,
A method for solidifying, a method for detoxifying fly ash by extracting heavy metals contained in the fly ash with an acid, and the like are performed.
【０００３】しかしながら、これらの処理方法は、いず
れも実用上不都合な方法である。すなわち、セメントを
用いて固化する方法は、使用するセメントの量が多大な
ため処理コストが高くなったり、重金属の固定化が不完
全なため、飛灰中の重金属濃度が高くなると、雨水への
溶出濃度が上昇する。また、酸抽出する方法は、抽出操
作が煩雑であり、さらに、抽出液からの重金属の無害
化、排水の無害化等の操作が必要である。However, all of these processing methods are practically inconvenient. In other words, the method of solidifying with cement increases the treatment cost due to the large amount of cement used, or the immobilization of heavy metals is incomplete, so when the heavy metal concentration in fly ash increases, The elution concentration increases. In addition, the method of acid extraction requires complicated operations such as detoxification of heavy metals from the extraction liquid and detoxification of waste water.
【０００４】[0004]
【発明が解決しようとする問題点】本発明は、上記問題
点を解決するため、従来比較的普及している設備を使用
し、安価で、都市ゴミや産業廃棄物の焼却炉から発生し
た飛灰中に含まれる重金属の雨水等への溶出を簡単な方
法で長期にわたり安定して防止するための飛灰中の重金
属の無害化処理方法を提供することを目的とする。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention uses equipment that has been comparatively widely used in the past, is inexpensive, and produces the waste generated from an incinerator for municipal waste and industrial waste. It is an object of the present invention to provide a detoxifying treatment method for heavy metals in fly ash, which is capable of stably preventing heavy metals contained in ash from eluting into rainwater and the like for a long period of time by a simple method.
【０００５】[0005]
【課題を解決するための手段】本発明者等は、鋭意研究
を重ねた結果、重金属を含む飛灰に、水とキレート化剤
であるトリス（ジチオカルボキシ）ジエチレントリアミ
ン、又は、Ｎ1 ，Ｎ2−ビス（ジチオカルボキシ）ジエ
チレントリアミン、若しくはそれらの塩の少なくとも一
種を加え、混練することにより、飛灰中の重金属とキレ
ート化剤とが反応して、水に不溶性のキレート化合物を
生成し、飛灰からの重金属の溶出が防止し得ることを見
出した。Means for Solving the Problems As a result of intensive studies, the present inventors have found that fly ash containing heavy metals is mixed with water and a chelating agent, tris (dithiocarboxy) diethylenetriamine, or N 1 , N 2 -By adding at least one of bis (dithiocarboxy) diethylenetriamine or a salt thereof and kneading, the heavy metal in the fly ash reacts with the chelating agent to produce a water-insoluble chelate compound, and fly ash It was found that the elution of heavy metals from the can be prevented.
【０００６】本発明は、上記知見に基づいてなされたも
のであって、都市ゴミや産業廃棄物の焼却炉で発生した
重金属を含む飛灰に、水とキレート化剤を加え混練する
ことにより、飛灰中の重金属を水に対し不溶性にしたこ
とを特徴とするものである。The present invention has been made on the basis of the above findings, and by adding water and a chelating agent to a fly ash containing heavy metals generated in an incinerator for municipal waste and industrial waste, and kneading the mixture, It is characterized in that the heavy metal in the fly ash is made insoluble in water.
【０００７】以下、本発明を詳細に説明する。本発明に
おいて使用するキレート化剤とは、トリス（ジチオカル
ボキシ）ジエチレントリアミン、又は、Ｎ1 ，Ｎ2 −ビ
ス（ジチオカルボキシ）ジエチレントリアミン、若しく
はそれらの塩であり、それらの１種又は２種を混合して
使用することができる。The present invention will be described in detail below. The chelating agent used in the present invention is tris (dithiocarboxy) diethylenetriamine, N 1 , N 2 -bis (dithiocarboxy) diethylenetriamine, or a salt thereof, and one or two of them may be mixed. Can be used.
【０００８】本発明において使用するキレート化剤であ
るトリス（ジチオカルボキシ）ジエチレントリアミンの
塩、又は、Ｎ1 ，Ｎ2 −ビス（ジチオカルボキシ）ジエ
チレントリアミンの塩としては、それらのナトリウム
塩、カリウム塩、カルシウム塩及びアンモニウム塩など
を例示することができる。As the salt of tris (dithiocarboxy) diethylenetriamine or N 1 , N 2 -bis (dithiocarboxy) diethylenetriamine which is a chelating agent used in the present invention, sodium salt, potassium salt and calcium salt thereof are available. Examples thereof include salts and ammonium salts.
【０００９】本発明のキレート化剤は、例えば、特開昭
４９─９９９７８号報において教示されるように、ジエ
チレントリアミン、二硫化炭素、及びアルカリ化合物と
の反応により容易に製造することができる。The chelating agent of the present invention can be easily prepared by reaction with diethylenetriamine, carbon disulfide, and an alkaline compound, as taught in JP-A-49-99978.
【００１０】本発明においてキレート化剤の添加量は、
飛灰中の重金属の含有量や重金属の形態により異なる
が、通常、飛灰に対して０．１〜１０重量％である。In the present invention, the amount of the chelating agent added is
Although it depends on the content of heavy metal in fly ash and the form of heavy metal, it is usually 0.1 to 10 wt% with respect to fly ash.
【００１１】本発明において加えられる水の量は、混練
後の混練物の取扱方法により異なるが、通常、飛灰に対
して２０〜７０重量％である。The amount of water added in the present invention varies depending on the method of handling the kneaded product after kneading, but is usually 20 to 70% by weight based on the fly ash.
【００１２】本発明のキレート化剤は、混練時に特にｐ
Ｈ調整を行わなくとも重金属の固定化は十分になされ
る。The chelating agent of the present invention is used especially at the time of kneading.
Even if H adjustment is not carried out, the heavy metal can be sufficiently fixed.
【００１３】都市ゴミや産業廃棄物の焼却炉で発生する
飛灰のｐＨは１０以上のアルカリ性を示すものが多い。
一方、本発明のキレート化剤は、混練時のｐＨによって
重金属の固定化力が異なり、水への溶出濃度が異なる。
本発明のキレート化剤であるトリス（ジチオカルボキ
シ）ジエチレントリアミン、又は、Ｎ1 ，Ｎ2 −ビス
（ジチオカルボキシ）ジエチレントリアミン、若しくは
それらの塩の混練時のｐＨと金属溶出濃度の関係は、い
ずれも重金属の種類によって異なるが、飛灰中に含まれ
る重金属類である鉛、カドミウム、クロム、ニッケル、
亜鉛に対しては、ｐＨ４〜１０の範囲で使用すると、さ
らに重金属の固定化力が増し、飛灰からの重金属の溶出
防止が確実になる。The pH of fly ash generated in an incinerator for municipal waste and industrial waste often shows an alkalinity of 10 or more.
On the other hand, in the chelating agent of the present invention, the immobilizing power of heavy metals varies depending on the pH during kneading, and the elution concentration in water varies.
The chelating agent of the present invention, tris (dithiocarboxy) diethylenetriamine, or N 1 , N 2 -bis (dithiocarboxy) diethylenetriamine, or the salt thereof when kneading, is related to the relationship between pH and metal elution concentration. , Which are heavy metals contained in fly ash, such as lead, cadmium, chromium, nickel,
When zinc is used in a pH range of 4 to 10, the immobilization power of heavy metals is further increased, and the elution of heavy metals from fly ash is reliably prevented.
【００１４】本発明は、都市ゴミや産業廃棄物の焼却炉
で発生する飛灰に、水とキレート化剤を加え混練するこ
とにより、飛灰中に含まれる重金属の雨水等への溶出を
防止する飛灰の無害化処理方法であるが、混練後の処理
については、埋め立て、海洋投棄等のその後の処理目的
に応じて、造粒、成形等の処理を行うことができる。The present invention prevents the elution of heavy metals contained in fly ash into rainwater by adding water and a chelating agent to the fly ash generated in an incinerator for municipal waste and industrial waste. Regarding the method for detoxifying fly ash, the treatment after kneading may be granulation, molding or the like depending on the purpose of the subsequent treatment such as landfill or ocean dumping.
【００１５】[0015]
【実施例】次に、実施例によりさらに詳細に本発明を説
明する。但し、本発明は下記実施例によって何ら制限を
うけるものではない。 （製造例１）密閉容器中にジエチレントリアミン１０５
部、ＮａＯＨ８８部、水７００部とを入れ、この混合溶
液中に、窒素雰囲気下、３０〜４０℃で二硫化炭素１５
０部を２時間かけて滴下した。滴下終了後、反応液中に
窒素ガスをバブリングさせて未反応の二硫化炭素を留去
して黄褐色の液体を得た。ヨードメトリー法による分子
中のＣＳ2 量を定量した結果、生成物１００ｇ当たり１
０．９ｇであった。このこと、このものは、Ｎ1 ，Ｎ2
−ビス（ジチオカルボキシ）ジエチレントリアミンのナ
トリウム塩と推定された。EXAMPLES Next, the present invention will be described in more detail by way of examples. However, the present invention is not limited to the following examples. (Production Example 1) Diethylenetriamine 105 was placed in a closed container.
Parts, 88 parts of NaOH, and 700 parts of water were added, and carbon disulfide 15 was added to the mixed solution at 30 to 40 ° C. under a nitrogen atmosphere.
0 part was added dropwise over 2 hours. After completion of dropping, nitrogen gas was bubbled into the reaction solution to distill off unreacted carbon disulfide to obtain a yellowish brown liquid. As a result of quantifying the amount of CS 2 in the molecule by the iodometry method, 1 per 100 g of the product was obtained.
It was 0.9 g. This thing, this one is N 1 , N 2
-Suspected to be the sodium salt of bis (dithiocarboxy) diethylenetriamine.
【００１６】（製造例２）密閉容器中にジエチレントリ
アミン１０５部、ＮａＯＨ１３２部、水７００部とを入
れ、この混合溶液中に、窒素雰囲気下、３０〜４０℃で
二硫化炭素２２５部を２時間かけて滴下した。滴下終了
後、反応液中に窒素ガスをバブリングさせて未反応の二
硫化炭素を留去して黄褐色の液体を得た。このものの重
水（Ｄ2 Ｏ）中のＨ1 −ＮＭＲスペクトル（内部標準：
Sodium 3-Trimethylsilylpropionate-2,2,3,3-d4，以下
ＴＳＰと略，δｐｐｍ）は、３．９（ｔ），４．３
（ｔ）であり、Ｃ13−ＮＭＲスペクトル（内部標準：Ｔ
ＳＰ，δｐｐｍ）は、４８、５５、２１３．５、２１
３．８であった。また、ヨードメトリー法による分子中
のＣＳ2 量を定量した結果、生成物１００ｇ当たり１
８．６ｇであった。以上の結果から、このものは、Ｎ，
Ｎ’，Ｎ”−トリス（ジチオカルボキシ）ジエチレント
リアミンのナトリウム塩の水溶液と推定された。(Production Example 2) 105 parts of diethylenetriamine, 132 parts of NaOH and 700 parts of water were placed in a closed container, and 225 parts of carbon disulfide was added to this mixed solution at 30 to 40 ° C. for 2 hours in a nitrogen atmosphere. Was dropped. After completion of dropping, nitrogen gas was bubbled into the reaction solution to distill off unreacted carbon disulfide to obtain a yellowish brown liquid. H 1 -NMR spectrum of this product in heavy water (D 2 O) (internal standard:
Sodium 3-Trimethylsilylpropionate-2,2,3,3-d 4 , hereinafter abbreviated as TSP, δppm) is 3.9 (t), 4.3
(T) and C 13 -NMR spectrum (internal standard: T
SP, δppm) is 48, 55, 213.5, 21
It was 3.8. In addition, the amount of CS 2 in the molecule was quantified by the iodometry method.
It was 8.6 g. From the above results, this
Presumed to be an aqueous solution of sodium salt of N ', N "-tris (dithiocarboxy) diethylenetriamine.
【００１７】（実施例１）鉛イオン１４００ｐｐｍを含
む都市ゴミ焼却炉飛灰１００重量部に対し、水４０重量
部を加え、Ｎ1 ，Ｎ2 −ビス（ジチオカルボキシ）ジエ
チレントリアミン３重量部加え、混練し、混練物を１０
日間常温で放置後、環境庁告示第１３号の方法により溶
出試験を行った。Example 1 40 parts by weight of water was added to 100 parts by weight of fly ash of an incinerator containing 1400 ppm of lead ions, and 3 parts by weight of N 1 , N 2 -bis (dithiocarboxy) diethylenetriamine was added and kneaded. And knead 10
After being left at room temperature for a day, a dissolution test was carried out by the method of Environmental Agency Notification No. 13.
【００１８】（実施例２）鉛イオン２５００ｐｐｍを含
む都市ゴミ焼却炉飛灰１００重量部に対し、水３５重量
部を加え、Ｎ1 ，Ｎ2 −ビス（ジチオカルボキシ）ジエ
チレントリアミン７重量部加え、混練し、混練物を１０
日間常温で放置後、環境庁告示第１３号の方法により溶
出試験を行った。(Example 2) 35 parts by weight of water was added to 100 parts by weight of fly ash of an incinerator containing 2500 ppm of lead ions, and 7 parts by weight of N 1 , N 2 -bis (dithiocarboxy) diethylenetriamine was added and kneaded. And knead 10
After being left at room temperature for a day, a dissolution test was carried out by the method of Environmental Agency Notification No. 13.
【００１９】（実施例３）鉛イオン１４００ｐｐｍを含
む都市ゴミ焼却炉飛灰１００重量部に対し、水４０重量
部を加え、ｐＨが７．５になるように塩酸を添加した
後、Ｎ1 ，Ｎ2 −ビス（ジチオカルボキシ）ジエチレン
トリアミン３重量部加え、混練し、混練物を１０日間常
温で放置後、環境庁告示第１３号の方法により溶出試験
を行った。[0019] For Example 3 municipal incinerator fly ash 100 parts by weight containing lead ions 1400 ppm, water 40 parts by weight was added and after addition of hydrochloric acid to pH 7.5, N 1, N 2 - bis (dithiocarboxy) diethylenetriamine 3 parts by weight was added and kneaded, after leaving the kneaded mixture at room temperature for 10 days, were subjected to an elution test according to the method of notification of the Environment Agency No. 13.
【００２０】（実施例４）鉛イオン２５００ｐｐｍを含
む都市ゴミ焼却炉飛灰１００重量部に対し、水３５重量
部を加え、ｐＨが６．５になるよう塩酸を添加した後、
Ｎ1 ，Ｎ2 −ビス（ジチオカルボキシ）ジエチレントリ
アミン７重量部加え、混練し、混練物を１０日間常温で
放置後、環境庁告示第１３号の方法により溶出試験を行
った。Example 4 35 parts by weight of water was added to 100 parts by weight of fly ash of a municipal waste incinerator containing 2500 ppm of lead ions, and hydrochloric acid was added to adjust the pH to 6.5.
After 7 parts by weight of N 1 , N 2 -bis (dithiocarboxy) diethylenetriamine was added and kneaded, the kneaded product was allowed to stand at room temperature for 10 days, and then the dissolution test was carried out by the method of Environmental Agency Notification No. 13.
【００２１】（比較例１）鉛イオン１４００ｐｐｍを含
む都市ゴミ焼却炉飛灰１００重量部に対し、水４０重量
部を加え混練し、混練物を１０日間常温で放置後、環境
庁告示第１３号の方法により溶出試験を行った。(Comparative Example 1) 40 parts by weight of water was added to 100 parts by weight of fly ash of an urban refuse incinerator containing 1400 ppm of lead ions and kneaded, and the kneaded product was allowed to stand at room temperature for 10 days. The dissolution test was performed by the method described in 1.
【００２２】（比較例２）鉛イオン２５００ｐｐｍを含
む都市ゴミ焼却炉飛灰１００重量部に対し、水３５重量
部を加え混練し、混練物を１０日間常温で放置後、環境
庁告示第１３号の方法により溶出試験を行った。(Comparative Example 2) 35 parts by weight of water was added to 100 parts by weight of fly ash of an urban refuse incinerator containing 2500 ppm of lead ions and kneaded, and the kneaded product was allowed to stand at room temperature for 10 days. The dissolution test was performed by the method described in 1.
【００２３】（試験結果）試験液中の鉛濃度は、以下の
通りであった。 実施例１ ０．５３ｍｇ／ｋｇ 実施例２ ０．３１ｍｇ／ｋｇ 実施例３ ０．２１ｍｇ／ｋｇ 実施例４ ０．１２ｍｇ／ｋｇ 比較例１ １０５ ｍｇ／ｋｇ 比較例２ １９０ ｍｇ／ｋｇ(Test Results) The lead concentration in the test solution was as follows. Example 1 0.53 mg / kg Example 2 0.31 mg / kg Example 3 0.21 mg / kg Example 4 0.12 mg / kg Comparative Example 1 105 mg / kg Comparative Example 2 190 mg / kg
【００２４】鉛イオン２７００ｐｐｍを含む都市ゴミ焼
却炉飛灰Ａ及び別の地域で採取した鉛イオン１７００ｐ
ｐｍを含む都市ゴミ焼却炉飛灰Ｂそれぞれ１００重量部
に対し、水１０００重量部、及び一定量の製造例１及び
２で得られたジチオカルボキシ化ジエチレントリアミン
のナトリウム塩水溶液を添加して十分に震盪したのち、
水溶液中に残存する鉛イオン濃度を測定した。水溶液中
の鉛イオン濃度を１ｐｐｍ以下にするのに必要な添加量
を下記表１にまとめた。Fly ash A from a municipal waste incinerator containing lead ion 2700 ppm and lead ion 1700 p collected in another area
To 100 parts by weight of city ash incinerator fly ash B containing pm, 1000 parts by weight of water and a certain amount of the aqueous solution of sodium salt of dithiocarboxylated diethylenetriamine obtained in Production Examples 1 and 2 were added and shaken sufficiently. After that,
The lead ion concentration remaining in the aqueous solution was measured. Table 1 below summarizes the amount of addition necessary to bring the concentration of lead ions in the aqueous solution to 1 ppm or less.
【００２５】[0025]
【表１】 [Table 1]
【００２６】[0026]
【発明の効果】以上説明したように、本発明の飛灰無害
化処理方法は、飛灰に水とキレート化剤としてトリス
（ジチオカルボキシ）ジエチレントリアミン、Ｎ1 ，Ｎ
2 −ビス（ジチオカルボキシ）ジエチレントリアミン、
又はそれらの塩を加えて混練することにより、飛灰中に
含まれる重金属の雨水等への溶出をほぼ完全に防止する
ことができる。As described above, according to the fly ash detoxification treatment method of the present invention, water and tris (dithiocarboxy) diethylenetriamine, N 1 , N as a chelating agent are added to fly ash.
2 -bis (dithiocarboxy) diethylenetriamine,
Alternatively, by adding these salts and kneading, elution of heavy metals contained in fly ash into rainwater or the like can be almost completely prevented.
【００２７】また、本発明の飛灰無害化処理方法の設備
としては、現在多くの都市ゴミや産業廃棄物の焼却炉
で、飛灰処理のため実施されている湿潤設備やセメント
固結装置等をそのまま使用することができるため、特別
な設備を必要とせず、経済的にも有利な方法である。As equipment for the fly ash detoxification treatment method of the present invention, there are many incinerators for municipal wastes and industrial wastes that are currently used for fly ash treatment, such as wet equipment and cement consolidator. Since it can be used as it is, no special equipment is required and it is an economically advantageous method.
Claims (1)
シ）ジエチレントリアミン、又はＮ1 ，Ｎ2 −ビス（ジ
チオカルボキシ）ジエチレントリアミン、若しくはそれ
らの塩とを、飛灰に添加し混練することを特徴とする飛
灰の無害化処理方法。1. A required amount of water and tris (dithiocarboxy) diethylenetriamine, N 1 , N 2 -bis (dithiocarboxy) diethylenetriamine, or a salt thereof are added to fly ash and kneaded. Method for detoxifying fly ash.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5197028A JPH0679254A (en) | 1992-07-14 | 1993-07-14 | Treating method to make fly ash harmless |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20976892 | 1992-07-14 | ||
| JP4-209768 | 1992-07-14 | ||
| JP5197028A JPH0679254A (en) | 1992-07-14 | 1993-07-14 | Treating method to make fly ash harmless |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0679254A true JPH0679254A (en) | 1994-03-22 |
Family
ID=26510121
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5197028A Pending JPH0679254A (en) | 1992-07-14 | 1993-07-14 | Treating method to make fly ash harmless |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0679254A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH091110A (en) * | 1995-04-17 | 1997-01-07 | Nippon Soda Co Ltd | Stabilizing method of heavy metal immobilizing agent |
| JPH09183763A (en) * | 1995-12-28 | 1997-07-15 | Nippon Soda Co Ltd | Aqueous solution of metal salt of dithiocarbamic acid and its production |
| KR100334328B1 (en) * | 1999-11-20 | 2002-04-25 | 주식회사 제이오스테크 | Method for treating fly ash containing heavy metal and soil covering materials using solid materials produced by the method |
| KR20030038914A (en) * | 2001-11-07 | 2003-05-17 | 주식회사 엠닥터 | A heavy metal-fixing agent stabilizing heavy metals contained in scattering wastes |
| JP2005336128A (en) * | 2004-05-28 | 2005-12-08 | Tosoh Corp | Aqueous dithiocarbamic acid salt solution, method for producing the same, heavy metal-fixing agent and method for fixing heavy metal |
| WO2011086999A1 (en) * | 2010-01-12 | 2011-07-21 | 東ソー株式会社 | Heavy metal treatment agent and heavy metal treatment method using same |
| WO2023277136A1 (en) | 2021-07-02 | 2023-01-05 | ミヨシ油脂株式会社 | Heavy metal treatment agent, and method for treating incinerated ash and wastewater using same |
-
1993
- 1993-07-14 JP JP5197028A patent/JPH0679254A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH091110A (en) * | 1995-04-17 | 1997-01-07 | Nippon Soda Co Ltd | Stabilizing method of heavy metal immobilizing agent |
| JPH09183763A (en) * | 1995-12-28 | 1997-07-15 | Nippon Soda Co Ltd | Aqueous solution of metal salt of dithiocarbamic acid and its production |
| KR100334328B1 (en) * | 1999-11-20 | 2002-04-25 | 주식회사 제이오스테크 | Method for treating fly ash containing heavy metal and soil covering materials using solid materials produced by the method |
| KR20030038914A (en) * | 2001-11-07 | 2003-05-17 | 주식회사 엠닥터 | A heavy metal-fixing agent stabilizing heavy metals contained in scattering wastes |
| JP2005336128A (en) * | 2004-05-28 | 2005-12-08 | Tosoh Corp | Aqueous dithiocarbamic acid salt solution, method for producing the same, heavy metal-fixing agent and method for fixing heavy metal |
| JP4696475B2 (en) * | 2004-05-28 | 2011-06-08 | 東ソー株式会社 | Dithiocarbamate aqueous solution, production method thereof, heavy metal immobilization agent and heavy metal immobilization treatment method |
| WO2011086999A1 (en) * | 2010-01-12 | 2011-07-21 | 東ソー株式会社 | Heavy metal treatment agent and heavy metal treatment method using same |
| JP2012120819A (en) * | 2010-01-12 | 2012-06-28 | Tosoh Corp | Heavy metal treating agent and heavy metal treating method using the same |
| WO2023277136A1 (en) | 2021-07-02 | 2023-01-05 | ミヨシ油脂株式会社 | Heavy metal treatment agent, and method for treating incinerated ash and wastewater using same |
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