JPH0615250A - Ash treatment method suppressing generation of hydrogen - Google Patents

Ash treatment method suppressing generation of hydrogen

Info

Publication number
JPH0615250A
JPH0615250A JP4174548A JP17454892A JPH0615250A JP H0615250 A JPH0615250 A JP H0615250A JP 4174548 A JP4174548 A JP 4174548A JP 17454892 A JP17454892 A JP 17454892A JP H0615250 A JPH0615250 A JP H0615250A
Authority
JP
Japan
Prior art keywords
ash
water
hydrogen
treatment
chelating agent
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
Application number
JP4174548A
Other languages
Japanese (ja)
Other versions
JP2920717B2 (en
Inventor
Kenichi Nagai
健一 長井
Kiichi Matsuoka
喜一 松岡
Jinshiro Fujita
仁四郎 藤田
Toshio Hama
利雄 濱
Kanji Ota
完志 太田
Naoko Hirata
直子 平田
Tadao Murakawa
忠夫 村川
Nobuhiro Maeda
信広 前田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Zosen Corp
Original Assignee
Hitachi Zosen Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Zosen Corp filed Critical Hitachi Zosen Corp
Priority to JP4174548A priority Critical patent/JP2920717B2/en
Publication of JPH0615250A publication Critical patent/JPH0615250A/en
Application granted granted Critical
Publication of JP2920717B2 publication Critical patent/JP2920717B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Processing Of Solid Wastes (AREA)

Abstract

PURPOSE:To eliminate the danger of the explosion of a hermetically closed kneader and to enhance the treatment efficiency of ash, in subjecting ash containing a harmful heavy metal to stabilizing treatment by a metal collector such as a water-soluble polymeric chelating agent, by adjusting a treatment solution to a required pH value. CONSTITUTION:In an ash treatment method suppressing the generation of hydrogen, when ash containing a harmful heavy metal is subjected to stabilizing treatment using a metal collector such as a water-soluble polymeric chelating agent, the pH of a treatment solution is controlled to 8-13. As a pH controller, for example, alkali metal hydroxide, alkaline earth metal hydroxide or transition metal hydroxide showing pH 9-12 when dissolved in water or electrolized is used. The water-soluble polymeric chelating agent is composed of a polymer matrix having a hydrophilic chelate forming group. By this constitution, the generation of hydrogen in a hermetically closed kneader kneading the metal collector and matter to be treated can be effectively suppressed.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】この発明は、人体に有害な重金属
を含む産業廃棄物の焼却処理により生じた焼却灰、飛
灰、電気集塵機(EP)捕集灰など(本明細書全体を通
して「灰分」という)の処理方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to incinerated ash, fly ash, and electrostatic precipitator (EP) collected ash produced by incineration of industrial waste containing heavy metals harmful to the human body. ")) Processing method.

【0002】[0002]

【従来の技術】水溶性の高分子キレート化剤は、高分子
マトリックスに親水性のキレート形成基を有するもので
あり、重金属イオンと選択的に反応して強力なキレート
結合を形成し、水に不溶性の高分子金属錯体を生成する
性質を有する。この性質を利用して、EP灰中の重金属
の固定化を行うことは公知である。
2. Description of the Related Art A water-soluble polymer chelating agent has a hydrophilic chelate-forming group in a polymer matrix and selectively reacts with heavy metal ions to form a strong chelate bond, which is dissolved in water. It has the property of forming an insoluble polymer metal complex. It is known to utilize this property to immobilize heavy metals in EP ash.

【0003】[0003]

【発明が解決しようとする課題】重金属を含む焼却灰や
EP捕集灰の安定化処理において、水溶性の高分子キレ
ート化剤と被処理物を密封系の混練機内で混練する工程
において、密封混練機内に水素が発生し、爆発の危険が
ある(「集じん灰バンカーにおける爆発事故原因の究
明」京都大学環境保全センター、1987.2. 第8回全国都
市清掃研究発表会講演論文集)。
In the stabilization treatment of incinerated ash containing heavy metals and EP collected ash, in the step of kneading a water-soluble polymer chelating agent and an object to be treated in a hermetic kneader, the hermetically sealed Hydrogen is generated in the kneading machine and there is a danger of explosion (“Investigating the cause of an explosion accident in a dust ash bunker”, Kyoto University Environmental Preservation Center, 1987.2.

【0004】この発明は、上記の実情に鑑みてなされた
ものであって、その目的は、灰分の安定化処理に当た
り、混練機内での水素発生を抑え、爆発の危険性をなく
すことができる灰分処理方法を提供することにある。
The present invention has been made in view of the above circumstances, and an object thereof is to stabilize the ash and suppress the generation of hydrogen in the kneader to eliminate the risk of explosion. It is to provide a processing method.

【0005】[0005]

【課題を解決するための手段】この発明は上記課題を解
決すべく工夫されたもので、処理液のpHを所要値に調
整することにより上記目的が達成されるという知見を得
て完成されたものである。
The present invention was devised to solve the above problems, and was completed with the knowledge that the above objects can be achieved by adjusting the pH of a treatment liquid to a required value. It is one.

【0006】すなわち、この発明による灰分処理方法
は、有害重金属を含んだ灰分を水溶性の高分子キレート
化剤などの金属捕集剤で安定化処理するに当たり、処理
液のpHをpH8からpH13に調整することを特徴と
するものである。
That is, according to the ash treatment method of the present invention, the pH of the treatment liquid is changed from pH 8 to pH 13 when stabilizing the ash containing harmful heavy metals with a metal scavenger such as a water-soluble polymer chelating agent. It is characterized by adjusting.

【0007】pH調整剤としては、たとえば、アルカリ
金属またはアルカリ土類の水酸化物、水に溶解ないしは
電解したときのpHが9〜12の範囲の値を示す遷移金
属水酸化物などが用いられる。
As the pH adjuster, for example, an alkali metal or alkaline earth hydroxide, a transition metal hydroxide having a pH value in the range of 9 to 12 when dissolved or electrolyzed in water are used. .

【0008】水溶性の高分子キレート化剤は、高分子マ
トリックスに親水性のキレート形成基を有するものであ
り、親水性のキレート形成基としては、グリシン基、β
−アラニン基、イミノジ酢酸基などのアミノ酸基、ジチ
オカルバミン酸基、ポリアミノ基、チオウレイド基など
が例示される。また、高分子マトリックスとしては、ポ
リエチレン、ポリ塩化ビニル、ポリスチレン、ポリビニ
ルアルコール、ポリアクリル酸、ポリエチレンイミン、
セルロース、デンプンなどが使用される。水溶性の高分
子キレート化剤として特に好適なものは、ミヨシ油脂
(株)製のエポフロックL1などである。
The water-soluble polymer chelating agent has a hydrophilic chelate-forming group in the polymer matrix, and the hydrophilic chelate-forming group includes a glycine group and β.
Examples thereof include an amino acid group such as an alanine group and an iminodiacetic acid group, a dithiocarbamic acid group, a polyamino group, and a thioureido group. Further, as the polymer matrix, polyethylene, polyvinyl chloride, polystyrene, polyvinyl alcohol, polyacrylic acid, polyethyleneimine,
Cellulose, starch, etc. are used. Particularly suitable as the water-soluble polymer chelating agent is Epofloc L1 manufactured by Miyoshi Yushi Co., Ltd. and the like.

【0009】[0009]

【実施例】つぎに、この発明を具体的に説明するため
に、この発明の実施例およびこれとの比較を示すための
比較例をいくつか挙げる。
EXAMPLES In order to specifically explain the present invention, some examples of the present invention and comparative examples for showing a comparison therewith will be given.

【0010】実施例1 初めに、実験装置について説明する。図1において、攪
拌機(1) と温度計(2)とコンデンサ(3) とを備えた反応
器(4) がウオータバス(5) 中に配置され、コンデンサ
(3) を通り抜けたガスはグリセリンを入れた密閉容器
(6) に導かれ、同ガスによってこの容器(6) から押し出
されたグリセリンの量がメスシリンダ(7) によって測定
される。
Example 1 First, the experimental apparatus will be described. In FIG. 1, a reactor (4) equipped with a stirrer (1), a thermometer (2) and a condenser (3) is arranged in a water bath (5),
The gas that passed through (3) is a closed container containing glycerin.
The amount of glycerin guided to (6) and pushed out of this container (6) by the gas is measured by a graduated cylinder (7).

【0011】上記構成の実験装置において、反応器(4)
にEP灰100gとCa(OH)2を10gを投入し、
温度を60℃に保持して、EP灰とCa(OH)2 を3
00rpmで攪拌した。メスシリンダ(7) におけるグリ
セリンの滴下量を測定し、この値をガスの発生量とし
た。発生したガスが水素ガスであることはガスクロマト
グラフィで確認した。また、反応初期および反応終期に
おけるpHを測定した。こうして求めた水素ガスの発生
量およびpH値を表1および図2に示す。
In the experimental apparatus having the above structure, the reactor (4)
Add 100 g of EP ash and 10 g of Ca (OH) 2 to
Keeping the temperature at 60 ° C, the EP ash and Ca (OH) 2
It was stirred at 00 rpm. The amount of glycerin dropped in the graduated cylinder (7) was measured, and this value was used as the amount of gas generated. It was confirmed by gas chromatography that the generated gas was hydrogen gas. In addition, the pH was measured at the initial stage and the final stage of the reaction. The amount of generated hydrogen gas and the pH value thus obtained are shown in Table 1 and FIG.

【0012】実施例2〜4 Ca(OH)2 の使用量を5g(実施例2)、2g(実
施例3)、1g(実施例4)にそれぞれ変化させ、その
他の点は実施例1と同様の操作を行って、水素ガスの発
生量を測定した。
Examples 2 to 4 The amount of Ca (OH) 2 used was changed to 5 g (Example 2), 2 g (Example 3) and 1 g (Example 4), respectively. The same operation was performed to measure the amount of hydrogen gas generated.

【0013】実施例5〜7 Ca(OH)2 の代わりにNaOHを用い、その使用量
を4g(実施例5)、3g(実施例6)、1.2g(実
施例7)にそれぞれ変化させ、その他の点は実施例1と
同様の操作を行って、水素ガスの発生量を測定した。
Examples 5 to 7 NaOH was used in place of Ca (OH) 2 , and the amount used was changed to 4 g (Example 5), 3 g (Example 6) and 1.2 g (Example 7), respectively. The other operations were performed in the same manner as in Example 1 to measure the amount of hydrogen gas generated.

【0014】比較例1 Ca(OH)2 の代わりに水450mlを用い、その他
の点は実施例1と同様の操作を行って、水素ガスの発生
量を測定した。
Comparative Example 1 450 ml of water was used in place of Ca (OH) 2 , and the same operation as in Example 1 was carried out in other respects, and the amount of hydrogen gas generated was measured.

【0015】比較例2 Ca(OH)2 の代わりにCu(OH)2 1gを用い、
その他の点は実施例1と同様の操作を行って、水素ガス
の発生量を測定した。
Comparative Example 2 1 g of Cu (OH) 2 was used instead of Ca (OH) 2 .
Otherwise, the same operation as in Example 1 was carried out to measure the amount of hydrogen gas generated.

【0016】比較例3 Ca(OH)2 の代わりにNaOH18gを用い、その
他の点は実施例1と同様の操作を行って、水素ガスの発
生量を測定した。
Comparative Example 3 The same operation as in Example 1 was carried out except that 18 g of NaOH was used in place of Ca (OH) 2 and the amount of hydrogen gas generated was measured.

【0017】[0017]

【表1】 表1および図2から明らかなように、処理液のpHをp
H8からpH13に調整することにより、水素ガスの発
生量が効果的に抑制されることが認められる。
[Table 1] As is clear from Table 1 and FIG.
It is recognized that the amount of hydrogen gas generated is effectively suppressed by adjusting the pH from H8 to 13.

【0018】[0018]

【発明の効果】この発明による灰分処理方法では、有害
重金属を含んだ灰分を水溶性の高分子キレート化剤など
の金属捕集剤で安定化処理するに当たり、処理液のpH
をpH8からpH13に調整するので、金属捕集剤と被
処理物を混練する密封系の混練機内で水素が発生するの
を効果的に抑制することができ、その結果密封系の混練
機の爆発の危険性をなくすることができる。
According to the ash treatment method of the present invention, when the ash containing harmful heavy metals is stabilized with a metal scavenger such as a water-soluble polymer chelating agent, the pH of the treatment liquid is
Since the pH is adjusted from pH 8 to pH 13, it is possible to effectively suppress the generation of hydrogen in the sealed kneader for kneading the metal scavenger and the object to be treated, and as a result, the explosion of the sealed kneader The risk of can be eliminated.

【0019】また、こうして水素の発生が抑制されるの
で、混練すべき灰量を多くすることができ、灰分の処理
効率を向上させることができる。
Further, since the generation of hydrogen is suppressed in this way, the amount of ash to be kneaded can be increased and the efficiency of ash treatment can be improved.

【図面の簡単な説明】[Brief description of drawings]

【図1】実験装置の概略を示す垂直断面図である。FIG. 1 is a vertical sectional view showing the outline of an experimental device.

【図2】水素ガスの発生量とpH値の関係を示すグラフ
である。
FIG. 2 is a graph showing the relationship between the amount of hydrogen gas generated and the pH value.

─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───

【手続補正書】[Procedure amendment]

【提出日】平成4年9月11日[Submission date] September 11, 1992

【手続補正1】[Procedure Amendment 1]

【補正対象書類名】明細書[Document name to be amended] Statement

【補正対象項目名】0011[Correction target item name] 0011

【補正方法】変更[Correction method] Change

【補正内容】[Correction content]

【0011】上記構成の実験装置において、反応器(4)
にEP灰100gと水450mlとCa(OH)2 を1
0gを投入し、温度を60℃に保持して、300rpm
で攪拌した。メスシリンダ(7) におけるグリセリンの滴
下量を測定し、この値をガスの発生量とした。発生した
ガスが水素ガスであることはガスクロマトグラフィで確
認した。また、反応初期および反応終期におけるpHを
測定した。こうして求めた水素ガスの発生量およびpH
値を表1および図2に示す。
In the experimental apparatus having the above structure, the reactor (4)
To 100 g of EP ash, 450 ml of water and 1 Ca (OH) 2 .
0g was charged, and the temperature was kept at 60 ° C., 3 rpm
It was stirred at. The amount of glycerin dropped in the graduated cylinder (7) was measured, and this value was used as the amount of gas generated. It was confirmed by gas chromatography that the generated gas was hydrogen gas. In addition, the pH was measured at the initial stage and the final stage of the reaction. Generation amount and pH of hydrogen gas thus obtained
The values are shown in Table 1 and FIG.

【手続補正2】[Procedure Amendment 2]

【補正対象書類名】明細書[Document name to be amended] Statement

【補正対象項目名】0014[Correction target item name] 0014

【補正方法】変更[Correction method] Change

【補正内容】[Correction content]

【0014】比較例1 Ca(OH)2 を用いず、その他の点は実施例1と同様
の操作を行って、水素ガスの発生量を測定した。
Comparative Example 1 The same operation as in Example 1 was performed except that Ca (OH) 2 was not used , and the amount of hydrogen gas generated was measured.

フロントページの続き (72)発明者 濱 利雄 大阪市此花区西九条5丁目3番28号 日立 造船株式会社内 (72)発明者 太田 完志 大阪市此花区西九条5丁目3番28号 日立 造船株式会社内 (72)発明者 平田 直子 大阪市此花区西九条5丁目3番28号 日立 造船株式会社内 (72)発明者 村川 忠夫 大阪市此花区西九条5丁目3番28号 日立 造船株式会社内 (72)発明者 前田 信広 大阪市此花区西九条5丁目3番28号 日立 造船株式会社内Front page continued (72) Inventor Toshio Hama 5-3-8 Nishikujo, Konohana-ku, Osaka City Hitachi Shipbuilding Co., Ltd. (72) Koshi Ota 5-3-28 Nishikujo, Konohana-ku, Osaka Hitachi Shipbuilding (72) Inventor Naoko Hirata 5-3-28 Nishikujo, Konohana-ku, Osaka Hitachi Shipbuilding Co., Ltd. (72) Inventor Tadao Murakawa 5-3-28 Nishikujo, Konohana-ku, Osaka Hitachi Shipbuilding Co., Ltd. (72) Inventor Nobuhiro Maeda 5-3-28 Nishikujo, Konohana-ku, Osaka City Hitachi Shipbuilding Co., Ltd.

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 有害重金属を含んだ灰分を水溶性の高分
子キレート化剤などの金属捕集剤で安定化処理するに当
たり、処理液のpHをpH8からpH13に調整するこ
とを特徴とする水素発生を抑制した灰分処理方法。
1. A method for stabilizing ash containing harmful heavy metals with a metal scavenger such as a water-soluble polymer chelating agent, wherein the pH of the treatment liquid is adjusted from pH 8 to pH 13. Ash treatment method that suppresses generation.
JP4174548A 1992-07-01 1992-07-01 Ash treatment method with reduced hydrogen generation Expired - Fee Related JP2920717B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4174548A JP2920717B2 (en) 1992-07-01 1992-07-01 Ash treatment method with reduced hydrogen generation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4174548A JP2920717B2 (en) 1992-07-01 1992-07-01 Ash treatment method with reduced hydrogen generation

Publications (2)

Publication Number Publication Date
JPH0615250A true JPH0615250A (en) 1994-01-25
JP2920717B2 JP2920717B2 (en) 1999-07-19

Family

ID=15980484

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4174548A Expired - Fee Related JP2920717B2 (en) 1992-07-01 1992-07-01 Ash treatment method with reduced hydrogen generation

Country Status (1)

Country Link
JP (1) JP2920717B2 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4981270A (en) * 1972-12-13 1974-08-06
JPS63278589A (en) * 1987-05-11 1988-11-16 Minoru Sawachi Method for making fly ash harmless
JPH01218672A (en) * 1988-02-29 1989-08-31 Nkk Corp Method for treating alkali-containing fly ash

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4981270A (en) * 1972-12-13 1974-08-06
JPS63278589A (en) * 1987-05-11 1988-11-16 Minoru Sawachi Method for making fly ash harmless
JPH01218672A (en) * 1988-02-29 1989-08-31 Nkk Corp Method for treating alkali-containing fly ash

Also Published As

Publication number Publication date
JP2920717B2 (en) 1999-07-19

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