JPH11199227A - Method for recovering chemical raw material from fly ash - Google Patents
Method for recovering chemical raw material from fly ashInfo
- Publication number
- JPH11199227A JPH11199227A JP2036798A JP2036798A JPH11199227A JP H11199227 A JPH11199227 A JP H11199227A JP 2036798 A JP2036798 A JP 2036798A JP 2036798 A JP2036798 A JP 2036798A JP H11199227 A JPH11199227 A JP H11199227A
- Authority
- JP
- Japan
- Prior art keywords
- fly ash
- raw material
- chemical raw
- raw materials
- washing 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
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はゴミの焼却炉または
溶融炉で発生する飛灰からアルカリ金属を主体とするガ
ラス原料や石鹸、洗剤、肥料等に有用な化学原料を回収
する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 a method for recovering glass raw materials mainly composed of alkali metals and chemical raw materials useful for soaps, detergents and fertilizers from fly ash generated in a refuse incinerator or melting furnace. is there.
【０００２】[0002]
【従来の技術】ゴミの焼却炉または溶融炉でゴミを焼却
したときに発生する飛灰には、重金属および塩類がふく
まれている。その飛灰を水で洗浄した洗浄水中には、重
金属のほかにＮａ，Ｋ，Ｃａ，ＳＯ4 ，Ｃｌ成分などの
ガラス原料、石鹸、洗剤、肥料として有用な化学原料が
含まれている。とくに、Ｋ成分は化学原料として貴重で
ある。これは、光学ガラス、薬用石鹸、肥料の原料とし
て不可欠なものである。従来、飛灰の洗浄水から重金属
を除去回収して有効利用する方法は、各種検討されてい
たが、飛灰の洗浄水から上記の塩類を回収し有効利用す
る方法は提案されていなかった。一方、これらの化学原
料は減少する傾向にあり、新たな原料供給ルートの確保
が重要になっている。2. Description of the Related Art Fly ash generated when waste is incinerated in a waste incinerator or melting furnace contains heavy metals and salts. The washing water obtained by washing the fly ash with water contains glass raw materials such as Na, K, Ca, SO 4 , and Cl components, and chemical raw materials useful as soaps, detergents, and fertilizers, in addition to heavy metals. In particular, the K component is valuable as a chemical raw material. It is indispensable as a raw material for optical glass, medicated soap and fertilizer. Conventionally, various methods have been studied for removing and recovering heavy metals from the fly ash washing water for effective use. However, no method has been proposed for recovering the above-mentioned salts from the fly ash washing water for effective use. On the other hand, these chemical raw materials tend to decrease, and it is important to secure new raw material supply routes.
【０００３】[0003]
【発明が解決しようとする課題】本発明は、ゴミの焼却
炉または溶融炉の飛灰中にアルカリ成分を主体とする有
用な化学原料が含まれていることに注目し、それを回収
すればガラス原料等の新しい供給源になるという知見を
もとにしており、飛灰を洗浄した洗浄水から効率的に化
学原料を回収することを課題とするものである。SUMMARY OF THE INVENTION The present invention focuses on the fact that fly ash from garbage incinerators or melting furnaces contains useful chemical raw materials mainly composed of alkali components. It is based on the knowledge that it will be a new supply source of glass raw materials and the like, and it is an object of the present invention to efficiently recover chemical raw materials from washing water obtained by washing fly ash.
【０００４】[0004]
【課題を解決するための手段】すなわち請求項１に記載
の発明は、ゴミの焼却炉または溶融炉で発生した飛灰の
洗浄水から有用な原料を回収する方法である。そしてこ
の方法は、先ず前記洗浄水をｐＨ調整により重金属の大
部分を沈殿または濾過分離し、次いでその上澄み液また
は濾過液をキレート樹脂に接触させて残った重金属を吸
着除去し、さらにアルカリ金属を含むその残液中から水
分を蒸発させてアルカリ金属を主成分とする化学原料を
分離することを特徴とするものである。上記方法によれ
ば、ゴミ焼却炉で発生した飛灰の洗浄水から通常は廃棄
処理されるアルカリ金属が化学原料として有効に活用で
きるようになる。そして上記方法を実施することによ
り、効率的に重金属を取り除いて高価なガラス原料、石
鹸原料、肥料として有用なものだけを効率的に回収する
ことができる。That is, the first aspect of the present invention is a method for recovering useful raw materials from washing water of fly ash generated in a refuse incinerator or a melting furnace. In this method, most of the heavy metal is precipitated or separated by filtration of the washing water by pH adjustment, and then the supernatant or the filtrate is brought into contact with a chelating resin to adsorb and remove the remaining heavy metal. The present invention is characterized in that water is evaporated from the remaining liquid to separate a chemical raw material containing an alkali metal as a main component. According to the above method, the alkali metal that is normally discarded from the washing water of the fly ash generated in the refuse incinerator can be effectively used as a chemical raw material. By carrying out the above-described method, heavy metals can be efficiently removed, and only expensive glass materials, soap materials, and materials useful as fertilizers can be efficiently collected.
【０００５】請求項２に記載の発明は、請求項１に記載
の発明の実施の形態であって、キレート樹脂に接触させ
て残った残液中から水分を遠心薄膜蒸発機により蒸発さ
せることを特徴とするものである。この方法によれば、
少ないエネルギーで効率良く残液中の水分を蒸発して化
学原料を分離することができる。請求項３に記載の発明
は、請求項１または請求項２に記載の発明の実施の形態
であって、洗浄水に酸を加えてｐＨが中性になるように
中和してからキレート樹脂に接触させることを特徴とす
るものである。この方法によれば、キレート樹脂による
重金属の吸着効率をより高めることができる。請求項４
に記載の発明は、請求項１〜請求項２のいずれかに記載
の発明の実施の形態であって、上澄み液または濾過液に
バリウム源を加えて含まれている硫酸イオンを硫酸バリ
ウムとして、それを分離除去するものである。この方法
によれば、硫酸イオンがガラス原料として不都合な場合
にそれを硫酸バリウムに変え、効率的に取り除くことが
できる。According to a second aspect of the present invention, there is provided an embodiment of the first aspect of the present invention, wherein moisture is evaporated by a centrifugal thin-film evaporator from remaining liquid remaining in contact with the chelating resin. It is a feature. According to this method,
It is possible to efficiently evaporate the water in the residual liquid with little energy and separate the chemical raw material. The invention according to claim 3 is an embodiment of the invention according to claim 1 or 2, wherein the chelating resin is neutralized by adding an acid to the washing water so that the pH becomes neutral. Is characterized by being brought into contact with. According to this method, the efficiency of heavy metal adsorption by the chelate resin can be further increased. Claim 4
The invention described in the embodiment of the invention according to any one of claims 1 to 2, wherein the sulfate ion contained by adding a barium source to the supernatant or the filtrate as barium sulfate, It is to separate and remove it. According to this method, when the sulfate ion is inconvenient as a glass raw material, it can be converted to barium sulfate and efficiently removed.
【０００６】[0006]
【発明の実施の形態】次に、本発明の実施の形態を説明
する。図１は本発明の方法を実施するプロセスフロー図
である。ゴミの焼却炉または溶融炉で発生した飛灰を洗
浄した洗浄水は、高アルカリ性でそのｐＨ値が１０〜１
２と高いので、これにｐＨ調整用の硫酸を加えてｐＨ
８．５程度に調整する。次いで、この洗浄水は配管１か
ら炭酸塩処理槽２に導入され、そこで配管３から供給さ
れる炭酸ナトリウムなどの炭酸イオン源を含む処理液と
混合して炭酸塩処理される。すなわち洗浄水中に含まれ
ている重金属およびカルシウムなどは通常水酸化物とし
て存在するが、これをこの工程で炭酸塩に変化して水に
対する溶解を低下させ、固形物として沈殿、濾過しやす
くするものである。なお、この炭酸塩による処理に代え
てリン酸塩または、水酸化物として処理することにより
重金属の溶解度を低下させて、それを固形物として沈
殿、濾過し易くしてもよい。また、重金属の水のｐＨに
対する溶解度は、各重金属により異なるので、各金属毎
にｐＨを代えて複数の工程で、複数の重金属を取り除く
こともできる。これらの処理は、公知であるのでさらな
る詳細は省略する。Next, an embodiment of the present invention will be described. FIG. 1 is a process flow diagram for implementing the method of the present invention. Wash water for washing fly ash generated in a garbage incinerator or melting furnace is highly alkaline and has a pH value of 10 to 1
2 and add sulfuric acid for pH adjustment
Adjust to about 8.5. Next, the washing water is introduced into the carbonate treatment tank 2 from the pipe 1, where it is mixed with a treatment liquid containing a carbonate ion source such as sodium carbonate supplied from the pipe 3 and subjected to carbonate treatment. In other words, heavy metals and calcium contained in the wash water are usually present as hydroxides, which are converted into carbonates in this step to reduce dissolution in water, and precipitate as solids and are easily filtered. It is. It is to be noted that, instead of the treatment with the carbonate, the solubility of the heavy metal may be reduced by treating it with a phosphate or a hydroxide to facilitate precipitation and filtration as a solid. In addition, since the solubility of heavy metals in water varies with the pH of each heavy metal, a plurality of heavy metals can be removed in a plurality of steps by changing the pH of each metal. Since these processes are known, further details are omitted.
【０００７】前記炭酸塩処理された洗浄水は配管４によ
り沈殿槽または濾過槽５に移送され、そこで溶解度の差
を利用して重金属およびカルシウムを固形物として沈殿
濾過分離して重金属処理系６に移送する。一方上澄み液
または濾過液は配管７によりｐＨ調整槽８に移送され、
そこで配管９から供給される硫酸などの酸と混合され、
例えばｐＨ７程度に中和する。なお、ｐＨ調整槽８には
必要に応じて配管１０から水酸化バリウム等のバリウム
源を含む溶液が添加される。通常、飛灰中には硫酸成分
が含まれているが、化学原料例えばガラス原料によって
は硫酸イオンが不都合な場合もあるので、そのような場
合に硫酸イオンをバリウムと反応させ、硫酸バリウムと
して取り除くことができる。The washing water subjected to the carbonate treatment is transferred to a sedimentation tank or a filtration tank 5 by a pipe 4 where heavy metals and calcium are precipitated and separated as solids by utilizing the difference in solubility to a heavy metal treatment system 6. Transfer. On the other hand, the supernatant or the filtrate is transferred to a pH adjusting tank 8 by a pipe 7,
There, it is mixed with an acid such as sulfuric acid supplied from the pipe 9,
For example, it is neutralized to about pH 7. In addition, a solution containing a barium source such as barium hydroxide is added to the pH adjusting tank 8 from the pipe 10 as necessary. Normally, fly ash contains a sulfuric acid component.Sulfate ions may be inconvenient depending on chemical raw materials, for example, glass raw materials.In such a case, the sulfate ions are reacted with barium and removed as barium sulfate. be able to.
【０００８】ｐＨ調整槽８でｐＨ調整した濾過液は配管
１１により吸着槽１２に移送され、そこで僅かに残存す
る重金属をキレート樹脂に吸着させて取り除く。重金属
鉄、マンガンなどがガラス原料中に混入するとガラスが
着色するなどの不都合が発生するので、できるだけ重金
属は除去する必要がある。重金属およびカルシウムが除
去された残液は配管１３により蒸発装置１４に移送さ
れ、そこで水分を蒸発除去してアルカリ成分を主成分と
するガラス原料を固形分として分離し、回収管１５より
回収する。なお、図示した蒸発装置１４は遠心薄膜蒸発
機を使用した例である。遠心薄膜蒸発機は筒状の本体外
周に加熱部が設けられ、本体内に連続的に導入される残
液が回転遠心装置により本体壁面に押しつけられて流下
する間に、本体壁面により加熱され水分が蒸発するよう
になっている。そのため遠心薄膜蒸発機を使用すると、
残液中の水分を迅速かつ効率よく蒸発できる。The filtrate whose pH has been adjusted in the pH adjusting tank 8 is transferred to an adsorption tank 12 by a pipe 11, where the slightly remaining heavy metal is adsorbed and removed by a chelating resin. When heavy metals such as iron and manganese are mixed in the glass raw material, disadvantages such as coloring of the glass occur, so that it is necessary to remove the heavy metals as much as possible. The residual liquid from which the heavy metals and calcium have been removed is transferred to an evaporator 14 by a pipe 13, where the water is evaporated to separate a glass raw material containing an alkali component as a main component as a solid content, which is recovered from a recovery pipe 15. The illustrated evaporator 14 is an example using a centrifugal thin film evaporator. The centrifugal thin-film evaporator is provided with a heating section on the outer periphery of a cylindrical main body, and while the residual liquid continuously introduced into the main body is pressed down against the main body wall by the rotary centrifugal device and flows down, the moisture is heated by the main body wall and Is to evaporate. Therefore, when using a centrifugal thin film evaporator,
Moisture in the residual liquid can be quickly and efficiently evaporated.
【０００９】上記のようにして重金属を除去した化学原
料中には、通常Ｎａ，Ｋ，Ｃｌなどが多く含まれてい
る。例えば、 （１）標準ガラスはＮａ2 −ＣａＯ−６ＳｉＯ2 に近い
組成比になっており、 （２）硬質ガラスはナトリウムをカリウムに置換したも
のであり、光学ガラスとして極めて有用である。したが
って、本発明の方法により供給される固形物はこれらの
ガラス原料として極めて有用である。 （３）また、前記原料中のＫはカリウム石鹸の原料とな
り、肌に優しい薬用石鹸として広く用いられている。 （４）さらに、前記原料中のＫは化学肥料として重要な
ものである。The chemical raw materials from which heavy metals have been removed as described above usually contain a large amount of Na, K, Cl and the like. For example, (1) the standard glass has a composition ratio close to that of Na 2 —CaO-6SiO 2 , and (2) the hard glass is obtained by replacing sodium with potassium, and is extremely useful as an optical glass. Therefore, the solids supplied by the method of the present invention are extremely useful as these glass raw materials. (3) K in the above-mentioned raw materials is a raw material for potassium soap, and is widely used as a medicated soap which is gentle on the skin. (4) Further, K in the raw material is important as a chemical fertilizer.
【００１０】[0010]
【発明の効果】以上のように請求項１に記載された発明
によれば、ゴミ焼却炉で発生した飛灰の洗浄水から通常
は廃棄処理されるアルカリ金属が化学原料として有効に
活用できるようになる。そして上記方法を実施すること
により、重金属を効率的に取り除いて化学原料に有用な
ものだけを回収することができる。請求項２に記載の発
明によれば、キレート樹脂に接触させて残った残液中か
ら遠心薄膜蒸発機により水分を蒸発させるようにしたの
で、少ないエネルギーで効率良く残液中の水分を蒸発し
て化学原料を分離することができる。請求項３に記載の
発明によれば、上澄み液または濾過液に硫酸などを加え
ｐＨを中性にしてからキレート樹脂に接触させ、キレー
ト樹脂による重金属の吸着効率をより高めることができ
る。請求項４に記載の発明によれば、上澄み液または濾
過液にバリウム源を加えて含まれている硫酸イオンを硫
酸バリウムとして分離除去してからキレート樹脂に接触
させるようにしたので、硫酸イオンが化学原料として不
都合な場合にそれを効率的に取り除くことができる。As described above, according to the first aspect of the present invention, alkali metals normally discarded from the washing water of fly ash generated in a garbage incinerator can be effectively used as a chemical raw material. become. By carrying out the above method, heavy metals can be efficiently removed, and only those useful as chemical raw materials can be recovered. According to the second aspect of the present invention, water is evaporated by the centrifugal thin-film evaporator from the residual liquid remaining in contact with the chelating resin, so that the water in the residual liquid is efficiently evaporated with little energy. To separate chemical raw materials. According to the third aspect of the invention, sulfuric acid or the like is added to the supernatant or the filtrate to make the pH neutral, and then the mixture is brought into contact with the chelate resin, whereby the efficiency of heavy metal adsorption by the chelate resin can be further increased. According to the invention as set forth in claim 4, a barium source is added to the supernatant or the filtrate to separate and remove sulfate ions contained therein as barium sulfate, and then contact with the chelate resin. When it is inconvenient as a chemical raw material, it can be efficiently removed.
【図１】本発明の方法を実施するプロセスフロー図。FIG. 1 is a process flow diagram for implementing the method of the present invention.
１ 配管 ２ 炭酸塩処理槽 ３ 配管 ４ 配管 ５ 濾過槽 ６ 重金属処理系 ７ 配管 ８ ｐＨ調整槽 ９ 配管 １０ 配管 １１ 配管 １２ 吸着槽 １３ 配管 １４ 蒸発装置 １５ 回収管 １６ 配管 DESCRIPTION OF SYMBOLS 1 Pipe 2 Carbonate processing tank 3 Pipe 4 Pipe 5 Filtration tank 6 Heavy metal processing system 7 Pipe 8 pH adjustment tank 9 Pipe 10 Pipe 11 Pipe 12 Adsorption tank 13 Pipe 14 Evaporator 15 Recovery pipe 16 Pipe
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｃ２２Ｂ 7/02 Ｂ０９Ｂ 3/00 ３０４Ｇ ──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 6 Identification code FI C22B 7/02 B09B 3/00 304G
Claims (4)
灰を洗浄した洗浄水から有用な原料を回収する方法であ
って、前記洗浄水をｐＨの調整により重金属の大部分を
塩として沈殿または濾過分離し、上澄み液または濾過液
をキレート樹脂に接触させて残った重金属を吸着除去
し、その残液中から水分を蒸発させてアルカリ金属を主
成分とする化学原料を分離することを特徴とする飛灰か
ら化学原料を回収する方法。1. A method for recovering useful raw materials from washing water obtained by washing fly ash generated in a refuse incinerator or melting furnace, wherein the washing water is subjected to pH adjustment to precipitate most of heavy metals as salts. Alternatively, it is characterized by separating by filtration, contacting the supernatant or filtrate with a chelating resin to adsorb and remove the remaining heavy metals, and evaporating water from the remaining liquid to separate a chemical raw material containing an alkali metal as a main component. A method of recovering chemical raw materials from fly ash.
蒸発させる請求項１に記載の飛灰から化学原料を回収す
る方法。2. The method for recovering chemical raw materials from fly ash according to claim 1, wherein water is evaporated from the remaining liquid by a centrifugal thin film evaporator.
ト樹脂に接触させる請求項１または請求項２に記載の飛
灰から化学原料を回収する方法。3. The method for recovering chemical raw materials from fly ash according to claim 1, wherein the washing water is neutralized by adding an acid thereto, and then contacted with a chelating resin.
液にバリウム源を加えて含まれている硫酸イオンを硫酸
バリウムとして、それを除去して飛灰から化学原料を回
収する方法。4. The method according to claim 3, wherein a barium source is added to the supernatant or the filtrate to remove barium sulfate as barium sulfate and remove the barium sulfate to recover chemical raw materials from fly ash.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2036798A JPH11199227A (en) | 1998-01-16 | 1998-01-16 | Method for recovering chemical raw material from fly ash |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2036798A JPH11199227A (en) | 1998-01-16 | 1998-01-16 | Method for recovering chemical raw material from fly ash |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11199227A true JPH11199227A (en) | 1999-07-27 |
Family
ID=12025118
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2036798A Pending JPH11199227A (en) | 1998-01-16 | 1998-01-16 | Method for recovering chemical raw material from fly ash |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11199227A (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001047001A (en) * | 1999-08-09 | 2001-02-20 | Unitika Ltd | Fly ash recycling treatment |
| JP2001049360A (en) * | 1999-08-12 | 2001-02-20 | Unitika Ltd | Process for recovering lead in fly ash |
| JP2001347264A (en) * | 2000-06-07 | 2001-12-18 | Shimadzu Corp | Water treatment equipment and water treatment method |
| JP2002146691A (en) * | 2000-11-06 | 2002-05-22 | Nippon Rensui Co Ltd | Method for treating collected ash in cooking chemical recovery process |
| JP2002528378A (en) * | 1998-10-30 | 2002-09-03 | ソルヴェイ | Method for producing aqueous sodium chloride solution |
| JP2004097890A (en) * | 2002-09-06 | 2004-04-02 | Kubota Corp | Addition method of heavy metal insolubilizing agent and equipment therefor |
| WO2004058423A1 (en) * | 2002-12-26 | 2004-07-15 | Kowa Co., Ltd. | Method for removing heavy metal in incineration ash |
| JP2007253029A (en) * | 2006-03-22 | 2007-10-04 | Kyoei Bussan Kk | Incineration residue treatment method and incineration residue treated matter |
| JP2008247647A (en) * | 2007-03-29 | 2008-10-16 | Mitsui Eng & Shipbuild Co Ltd | Manufacture method of sodium chloride aqueous solution for industrial use |
| JP2014199187A (en) * | 2013-03-29 | 2014-10-23 | 株式会社東芝 | Apparatus for processing contaminated fly ash, and processing method of contaminated fly ash |
| JP2016168545A (en) * | 2015-03-12 | 2016-09-23 | 戸田工業株式会社 | Heavy metal treatment material and treatment method of heavy metal-containing fly ash washing liquid |
| JP2018118192A (en) * | 2017-01-24 | 2018-08-02 | 清水建設株式会社 | Water treatment system and method |
| CN112893408A (en) * | 2021-01-20 | 2021-06-04 | 中洁蓝环保科技有限公司 | Method and system for producing salt by washing waste incineration fly ash to remove chlorine |
-
1998
- 1998-01-16 JP JP2036798A patent/JPH11199227A/en active Pending
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| JP2002528378A (en) * | 1998-10-30 | 2002-09-03 | ソルヴェイ | Method for producing aqueous sodium chloride solution |
| JP2001047001A (en) * | 1999-08-09 | 2001-02-20 | Unitika Ltd | Fly ash recycling treatment |
| JP2001049360A (en) * | 1999-08-12 | 2001-02-20 | Unitika Ltd | Process for recovering lead in fly ash |
| JP2001347264A (en) * | 2000-06-07 | 2001-12-18 | Shimadzu Corp | Water treatment equipment and water treatment method |
| JP2002146691A (en) * | 2000-11-06 | 2002-05-22 | Nippon Rensui Co Ltd | Method for treating collected ash in cooking chemical recovery process |
| JP2004097890A (en) * | 2002-09-06 | 2004-04-02 | Kubota Corp | Addition method of heavy metal insolubilizing agent and equipment therefor |
| WO2004058423A1 (en) * | 2002-12-26 | 2004-07-15 | Kowa Co., Ltd. | Method for removing heavy metal in incineration ash |
| JPWO2004058423A1 (en) * | 2002-12-26 | 2006-04-27 | 興和株式会社 | Method for removing heavy metals from incineration ash |
| JP2007253029A (en) * | 2006-03-22 | 2007-10-04 | Kyoei Bussan Kk | Incineration residue treatment method and incineration residue treated matter |
| JP2008247647A (en) * | 2007-03-29 | 2008-10-16 | Mitsui Eng & Shipbuild Co Ltd | Manufacture method of sodium chloride aqueous solution for industrial use |
| JP2014199187A (en) * | 2013-03-29 | 2014-10-23 | 株式会社東芝 | Apparatus for processing contaminated fly ash, and processing method of contaminated fly ash |
| JP2016168545A (en) * | 2015-03-12 | 2016-09-23 | 戸田工業株式会社 | Heavy metal treatment material and treatment method of heavy metal-containing fly ash washing liquid |
| JP2018118192A (en) * | 2017-01-24 | 2018-08-02 | 清水建設株式会社 | Water treatment system and method |
| CN112893408A (en) * | 2021-01-20 | 2021-06-04 | 中洁蓝环保科技有限公司 | Method and system for producing salt by washing waste incineration fly ash to remove chlorine |
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