JPH07305185A - Production of derusting solution - Google Patents
Production of derusting solutionInfo
- Publication number
- JPH07305185A JPH07305185A JP22249994A JP22249994A JPH07305185A JP H07305185 A JPH07305185 A JP H07305185A JP 22249994 A JP22249994 A JP 22249994A JP 22249994 A JP22249994 A JP 22249994A JP H07305185 A JPH07305185 A JP H07305185A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- water
- treatment
- thioglycolic acid
- ozone
- 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
Links
Landscapes
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は安全で衣服を傷つけるこ
となく、かつ低コストを実現できる錆落とし液の新規な
製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel method for producing a rust remover which is safe, does not damage clothes and can be manufactured at low cost.
【０００２】[0002]
【発明の背景】従来、錆落とし液としては、英国ホルツ
社製の「ラストップ・キット」等が知られているが、人
体に害を与えたり、衣服を傷つけるおそれがあり、また
コストも高く改善が求められていた。BACKGROUND OF THE INVENTION Conventionally, as a rust remover, "Last Stop Kit" manufactured by UK Holts Co., Ltd. has been known, but it may cause harm to the human body or damage clothes, and the cost is high. Improvement was sought.
【０００３】[0003]
【発明が解決しようとする課題】そこで本発明の目的
は、安全で衣服を傷つけることなく、かつ低コストを実
現できる錆落とし液の新規な製造方法を提供することに
ある。SUMMARY OF THE INVENTION It is an object of the present invention to provide a novel method for producing a rust remover which is safe, does not damage clothes, and can be realized at low cost.
【０００４】[0004]
【課題を解決するための手段】即ち、上記目的を達成す
る本発明に係る錆落とし液の製造方法の第一は、水を磁
場処理及び／又はオゾン処理した後、該処理液にチオグ
リコール酸類を混合した後、曝気し、その後赤外線処理
及び／又は磁場処理することを特徴とする。That is, the first method for producing a rust remover according to the present invention that achieves the above object is to subject water to a magnetic field treatment and / or an ozone treatment, and then add thioglycolic acid to the treatment liquid. Are mixed, aerated, and then subjected to infrared treatment and / or magnetic field treatment.
【０００５】本発明においては、磁場処理及び／又はオ
ゾン処理された水に対するチオグリコール酸類の混合量
が０．５〜５重量％であることが好ましい。またチオグ
リコール酸類の中で、チオグリコール酸を用いることが
好ましい。In the present invention, it is preferable that the mixing amount of thioglycolic acid with respect to the water subjected to the magnetic field treatment and / or the ozone treatment is 0.5 to 5% by weight. Among the thioglycolic acids, it is preferable to use thioglycolic acid.
【０００６】[0006]
【作用】本発明では、水を磁場処理及び／又はオゾン処
理した後の処理液にチオグリコール酸類を混合した後、
曝気しているが、かかる曝気の作用は定かでないが、推
論するに、水分子は分子式でＨ2Ｏと表されているが、
現実には数個のＨ2Ｏが結合した状態で存在し、一般に
は（Ｈ2Ｏ）nと表されている。本発明の曝気を行うと、
水の分子群の結合が切れあるいは緩み小さくなり、チオ
グリコール酸類の分子が水分子の中に嵌め込まれ易い状
態が形成され、時間の経過と共にチオグリコール酸類の
分子が水分子の中に嵌め込れ、新たな水分子の結合系が
形成されるものと思料される。かかるチオグリコール酸
類の分子の水分子への嵌め込みは曝気の作用のみなら
ず、前処理としての磁場処理及び／又はオゾン処理によ
ってより相乗作用的に確実に可能となるものと思われ
る。In the present invention, after mixing thioglycolic acid with the treatment liquid after magnetic field treatment and / or ozone treatment of water,
Although it is aerated, the effect of such aeration is not clear, but it is inferred that the water molecule is represented by H 2 O in the molecular formula,
In reality, several H 2 O exist in a bonded state, and are generally represented by (H 2 O) n . When the aeration of the present invention is performed,
The bond of the water molecule group is broken or loosened and a state in which the thioglycolic acid molecule is easily embedded in the water molecule is formed, and over time, the thioglycolic acid molecule is embedded in the water molecule. , It is considered that a new water molecule binding system is formed. It is considered that the fitting of the molecules of such thioglycolic acid into the water molecules can be achieved not only by the action of aeration but also by the magnetic field treatment and / or the ozone treatment as the pretreatment more synergistically and reliably.
【０００７】曝気によってチオグリコール酸類の分子が
水分子の中に嵌め込れ、新たな水分子の結合系が形成さ
れ、次いで上記の赤外線処理及び磁場処理を行うことに
より、嵌め込まれ整列した状態を維持、安定化する作用
をもたらし、錆落とし効果の持続性を発揮するものと思
われる。また前処理としての磁場処理及び／又はオゾン
処理によってかかる効果は相乗的により顕著となる。By aeration, molecules of thioglycolic acid are fitted into water molecules to form a new bond system of water molecules, and then the above infrared treatment and magnetic field treatment are carried out, so that the fitted and aligned state is maintained. It is thought to bring about the effect of maintaining and stabilizing, and exert the sustainability of the rust removal effect. In addition, the effect obtained by the magnetic field treatment and / or the ozone treatment as the pretreatment becomes synergistically more remarkable.
【０００８】また本発明では、水をベースとし添加剤成
分としてチオグリコール酸類しか用いていないので、安
全で衣服を傷つけることもなく、低コストを実現でき
る。Further, in the present invention, since only thioglycolic acid is used as an additive component based on water, it is safe and does not damage clothes, and low cost can be realized.
【０００９】[0009]
【具体的構成】以下、本発明の内容について詳述する。
本発明では、チオグリコール酸類を混合する前処理とし
て水を磁場処理する方法が採用されている。磁場処理は
極めて弱い磁場を水にかけることができればよく、具体
的には２〜２０ガウス程度の磁場が好ましい。かかる磁
場処理に用いられる磁石は永久磁石でも電磁石でもよ
い。Specific Structure The details of the present invention will be described below.
In the present invention, a method of magnetically treating water is used as a pretreatment for mixing thioglycolic acids. The magnetic field treatment only needs to be able to apply an extremely weak magnetic field to water, and specifically, a magnetic field of about 2 to 20 gauss is preferable. The magnet used for such magnetic field processing may be a permanent magnet or an electromagnet.
【００１０】またオゾン処理としては、公知のオゾン発
生機によって得られるオゾンを水中に供給すればよい。
オゾンの量は特に限定されないがコスト上昇の抑制を考
慮し水中で数ｐｐｍ程度であればよい。For ozone treatment, ozone obtained by a known ozone generator may be supplied into water.
The amount of ozone is not particularly limited, but may be about several ppm in water in consideration of suppressing cost increase.
【００１１】用いることができる水は特に限定されず、
通常の水道水や工業用水、天然水、自然水等のいずれで
もよい。The water that can be used is not particularly limited,
It may be ordinary tap water, industrial water, natural water, natural water, or the like.
【００１２】この磁場処理された水にチオグリコール酸
類を好ましくは０．５〜５重量％、より好ましくは１〜
２．５重量％混合し、所定時間放置する。チオグリコー
ル酸類としてはチオグリコール酸もしくはジチオグリコ
ール等が用いられるが、中でもチオグリコール酸がより
好ましい。Thioglycolic acids are preferably added to the magnetically treated water in an amount of 0.5 to 5% by weight, more preferably 1 to 5% by weight.
Mix 2.5 wt% and leave for a predetermined time. Thioglycolic acid or dithioglycol is used as the thioglycolic acid, and thioglycolic acid is more preferable.
【００１３】次いで上記の混合液を曝気する。曝気手段
としては混合液にブロアー等を用いて空気や窒素等の不
活性ガスを送り込む方法が一般的に考えられる。装置化
する上ではガスの気泡を微細にするための散気ノズルや
ディフューザー等を用いることも好ましい。曝気時間は
特に限定されないが、２〜１０時間程度が好ましく、よ
り好ましくは４〜６時間程度である。Next, the above mixed solution is aerated. As the aeration means, a method of sending an inert gas such as air or nitrogen to the mixed solution by using a blower or the like is generally considered. It is also preferable to use an air diffuser nozzle, a diffuser, or the like for making gas bubbles fine in order to make the apparatus. The aeration time is not particularly limited, but is preferably about 2 to 10 hours, more preferably about 4 to 6 hours.
【００１４】前述の如く、曝気の作用は定かでないが、
推論するに、水分子は分子式でＨ2Ｏと表されている
が、現実には数個のＨ2Ｏが結合した状態で存在し、一
般には（Ｈ2Ｏ）nと表されている。本発明の曝気を行う
と、水の分子群の結合が切れあるいは緩み小さくなり、
チオグリコール酸類の分子が水分子の中に嵌め込まれ易
い状態が形成され、時間の経過と共にチオグリコール酸
類の分子が水分子の中に嵌め込れ、新たな水分子の結合
系が形成されるものと思料される。As mentioned above, although the effect of aeration is not clear,
It is inferred that the water molecule is represented by H 2 O in the molecular formula, but in reality, it exists in a state in which several H 2 O are bonded, and is generally represented by (H 2 O) n . When the aeration of the present invention is performed, the bond of the water molecule group is broken or loosened, and
A state in which thioglycolic acid molecules are easily embedded in water molecules, and over time, thioglycolic acid molecules are embedded in water molecules, forming a new water molecule binding system. Is considered.
【００１５】かかるチオグリコール酸類の分子の水分子
への嵌め込みは曝気の作用のみならず、前処理としての
磁場処理及び／又はオゾン処理によってより確実に可能
となるものと思われる。It is considered that such fitting of molecules of thioglycolic acid into water molecules can be more surely achieved not only by the action of aeration but also by magnetic field treatment and / or ozone treatment as pretreatment.
【００１６】本発明では曝気を行った後、赤外線処理及
び又は磁場処理を行う。即ち曝気処理後に赤外線処理と
磁場処理をいずれか一方だけ行ってもよいが、好ましく
は赤外線処理と磁場処理の両方を行うことである。この
場合赤外線処理と磁場処理を同時に行うことが更に好ま
しい。In the present invention, after performing aeration, infrared processing and / or magnetic field processing is performed. That is, either the infrared treatment or the magnetic field treatment may be performed after the aeration treatment, but it is preferable to perform both the infrared treatment and the magnetic field treatment. In this case, it is more preferable to perform the infrared treatment and the magnetic field treatment at the same time.
【００１７】赤外線処理を施す手段は特に限定されない
が、暗室下で赤外線照射装置から前記混合液に直接照射
するようにすればよい。照射時間は４８〜５０時間の範
囲が好ましい。遠赤外線の照射も併用することは更に好
ましいことである。The means for applying infrared treatment is not particularly limited, but the infrared irradiation device may directly irradiate the mixed solution in a dark room. The irradiation time is preferably in the range of 48 to 50 hours. It is more preferable to use irradiation of far infrared rays together.
【００１８】またここにおける磁場処理は前述の前処理
としての磁場処理と同様であり極めて弱い磁場をかけら
れればよく、具体的には２〜２０ガウス程度の磁場が好
ましく、より好ましくは５〜８ガウス程度である。かか
る磁場処理に用いられる磁石は永久磁石でも電磁石でも
よい。The magnetic field treatment here is the same as the magnetic field treatment as the above-mentioned pretreatment, and an extremely weak magnetic field may be applied. Specifically, a magnetic field of about 2 to 20 gauss is preferable, and more preferably 5 to 8. It is about Gauss. The magnet used for such magnetic field processing may be a permanent magnet or an electromagnet.
【００１９】曝気によってチオグリコール酸類の分子が
水分子の中に嵌め込れ、新たな水分子の結合系が形成さ
れ、次いで上記の赤外線処理及び磁場処理を行うことに
より、嵌め込まれ整列した状態を維持、安定化する作用
をもたらし、錆落とし効果の持続性を発揮するものと思
われる。また本発明では前処理としての磁場処理及び／
又はオゾン処理によってかかる効果は相乗的により顕著
となる。By aeration, thioglycolic acid molecules are fitted into water molecules to form a new bond system of water molecules, and then the above infrared treatment and magnetic field treatment are carried out so that the fitted and aligned state is maintained. It is thought to bring about the effect of maintaining and stabilizing, and exert the sustainability of the rust removal effect. Further, in the present invention, the magnetic field treatment as the pretreatment and / or
Alternatively, the effect of ozone treatment becomes synergistically more remarkable.
【００２０】本発明の製造方法によって得られた錆落と
し液を使用するには、錆落とし液を容器内に入れておい
て、その容器の中に錆落とし対象物を浸漬する方法があ
るが、これに限定されず、錆落とし対象物が配管のよう
な場合には錆落とし液をポンプで配管内に送り、その配
管内を錆落とし液で充満するようにして所定時間放置す
る方法も好ましい方法である。In order to use the rust remover obtained by the production method of the present invention, there is a method in which the rust remover is put in a container and the rust remover is immersed in the container. Not limited to this, when the rust removal target is a pipe, a method is also preferable in which the rust removal liquid is pumped into the pipe, and the pipe is filled with the rust removal liquid and left for a predetermined time. Is.
【００２１】[0021]
【実施例】以下、本発明の実施例に基づき更に本発明の
内容を詳述するが、かかる実施例により本発明が限定さ
れるものではない。EXAMPLES The contents of the present invention will be described in more detail below with reference to examples of the present invention, but the present invention is not limited to these examples.
【００２２】実施例１ 図１に示す実験装置を用いて錆落とし液を製造する。同
図において、１は暗箱状ケースであり、この中に設けら
れた基台部２上に遠赤外線セラミックマット３が敷設さ
れており、また基台部２内には電磁石４が配置されてい
る。Example 1 A rust remover is manufactured using the experimental apparatus shown in FIG. In the figure, reference numeral 1 is a dark box-shaped case, on which a far-infrared ceramic mat 3 is laid on a base part 2 provided therein, and an electromagnet 4 is arranged in the base part 2. .
【００２３】基台部２にビーカー６を載置し、そのビー
カー１内に水道水５００ｍｌを入れる。次いで電磁石よ
り７．０ガウスの磁場を発生させ、水を数時間磁場処理
する。磁場処理後の水にチオグリコール酸を２．５重量
％添加する。次いで常温にて曝気管５を介して空気を送
り曝気する。６時間の曝気を行った後曝気を停止する。
その後、赤外線照射器７より赤外線を混合液に照射す
る。それと同時に電磁石より７．０ガウスの磁場を発生
させ前記混合液にあてる。赤外線照射及び磁場処理の処
理時間は約５０時間とした。A beaker 6 is placed on the base 2, and 500 ml of tap water is placed in the beaker 1. Then, a magnetic field of 7.0 gauss is generated from the electromagnet, and water is subjected to magnetic field treatment for several hours. 2.5% by weight of thioglycolic acid is added to water after the magnetic field treatment. Next, air is sent through the aeration pipe 5 at room temperature for aeration. Aeration is stopped after 6 hours of aeration.
Then, the mixed liquid is irradiated with infrared rays from the infrared irradiation device 7. At the same time, a 7.0 Gauss magnetic field is generated by an electromagnet and applied to the mixed solution. The processing time for infrared irradiation and magnetic field processing was about 50 hours.
【００２４】以上のようにして製造した試料液１を用い
て錆落とし効果の確認実験を行った。又試料液１を１か
月放置したものを試料液２として同様の確認実験を行っ
た。A test for confirming the rust removal effect was conducted using the sample liquid 1 produced as described above. Further, the same confirmation experiment was conducted by using the sample solution 1 left for one month as the sample solution 2.
【００２５】（確認実験）試料液１を試験管に移し、６
０×８×１ｍｍの全面に赤錆の発生した鉄片を投入・浸
漬した。鉄片に対しては一切の接触を行うことなく静置
した状態で観察した。 その結果、時間の経過と共に錆
が脱落し始め、その脱落部の面積が徐々に拡大し、１時
間後には鉄片全面積の７０％の錆が脱落し、銀色の金属
表面に戻った。またその金属片を４８時間放置しても脱
落部に錆は少ししか再発生しなかった。(Confirmation experiment) Sample liquid 1 was transferred to a test tube, and 6
Iron pieces in which red rust had occurred were placed and immersed on the entire surface of 0 × 8 × 1 mm. The iron pieces were observed in a stationary state without any contact. As a result, the rust started to drop off with the passage of time, the area of the drop-off portion gradually expanded, and after 1 hour, 70% of the total area of the iron piece had fallen off and returned to the silver metal surface. Even if the metal piece was left for 48 hours, only a small amount of rust was regenerated on the dropout part.
【００２６】試料液２についても同様の結果が得られ、
錆落とし効果の持続性に優れることが判った。Similar results were obtained for the sample liquid 2,
It was found that the rust removal effect was excellent in sustainability.
【００２７】実施例２ 最初の磁場処理に代えて、オゾン処理を行った以外は同
様に実験を行ったところ、同様の結果が得られた。Example 2 Similar results were obtained when the same experiment was conducted except that ozone treatment was carried out instead of the first magnetic field treatment.
【００２８】比較例１ 実施例１において、水道水を前処理としての磁場処理を
しない以外は同様にして比較試料液１を作成し、確認実
験を行ったところ、実験開始後１時間経過しても何の変
化も起きず、２〜３時間経過すると錆落とし効果が少し
認められた。Comparative Example 1 A comparative sample solution 1 was prepared in the same manner as in Example 1 except that tap water was not subjected to a magnetic field treatment as a pretreatment, and a confirmation experiment was carried out. No change occurred, and a little rust-removing effect was observed after a lapse of 2-3 hours.
【００２９】比較例２ 実施例１において、前処理としての磁場処理を行ない、
その磁場処理水にチオグリコール酸を混合した混合液
を、曝気、赤外線照射処理、磁場処理を行わず、そのま
ま比較試料液２とした。またその比較試料液２を１か月
間放置したものを比較試料液３として同様の確認実験を
行った。Comparative Example 2 In Example 1, magnetic field treatment was performed as pretreatment,
The mixed liquid prepared by mixing thioglycolic acid with the magnetic field-treated water was used as Comparative Sample Liquid 2 as it was without performing aeration, infrared irradiation treatment, and magnetic field treatment. Further, the same confirmation experiment was conducted by using the comparative sample solution 2 left for one month as the comparative sample solution 3.
【００３０】その結果、比較試料液２では錆落とし効果
が実験開始後１時間経過した時点で面積で約７０％の錆
部分が落ちた。しかし比較試料液４では錆落とし効果は
全く認められなかった。As a result, in the comparative sample solution 2, the rust-removing effect was such that about 70% of the area of the rust-removed portion fell off when 1 hour had passed after the start of the experiment. However, the rust-removing effect was not recognized at all in Comparative Sample Liquid 4.
【００３１】比較例３ 実施例１において、チオグリコール酸を用いない以外は
同様にして比較試料液５を作成し、確認実験を行ったと
ころ、実験開始後１時間経過しても何の変化も起きず、
全く錆落とし効果が認められなかった。Comparative Example 3 A comparative sample solution 5 was prepared in the same manner as in Example 1 except that thioglycolic acid was not used, and a confirmation experiment was conducted. As a result, no change was observed even after 1 hour from the start of the experiment. Don't get up
No rust removal effect was observed.
【００３２】実施例３ 実施例１、２において、実験装置において赤外線照射器
の位置を代えたり、あるいは電磁石を永久磁石に代えて
同様の実験を行なったが、各々実施例１、２と同様の効
果が得られた。Example 3 In Examples 1 and 2, the same experiment was carried out by changing the position of the infrared irradiator in the experimental apparatus or replacing the electromagnet with a permanent magnet. The effect was obtained.
【００３３】[0033]
【発明の効果】本発明によれば、安全で衣服を傷つける
ことなく、かつ低コストを実現できる錆落とし液の新規
な製造方法を提供でき、また錆落とし効果の持続性に優
れ、且つ効果の安定性および再現性に優れる錆落とし液
の製造方法を提供することができる。According to the present invention, it is possible to provide a novel method for producing a rust-removing solution which is safe, does not damage clothes, and can be realized at a low cost, and is excellent in the durability of the rust-removing effect. It is possible to provide a method for producing a rust remover which is excellent in stability and reproducibility.
【図面の簡単な説明】[Brief description of drawings]
【図１】実験装置を示す説明図FIG. 1 is an explanatory diagram showing an experimental device.
１：暗箱状ケース ２：基台部 ３：遠赤外線セラミックマット ４：電磁石 ５：曝気管 ６：ビーカー ７：赤外線照射器 1: Dark box case 2: Base part 3: Far infrared ceramic mat 4: Electromagnet 5: Aeration pipe 6: Beaker 7: Infrared irradiator
Claims (3)
後、該処理液にチオグリコール酸類を混合した後、曝気
し、その後赤外線処理及び／又は磁場処理することを特
徴とする錆落とし液の製造方法。1. A rust remover characterized by subjecting water to a magnetic field treatment and / or ozone treatment, mixing the treatment liquid with thioglycolic acid, and then aerating the mixture, followed by infrared treatment and / or magnetic field treatment. Production method.
対するチオグリコール酸類の混合量が０．５〜５重量％
であることを特徴とする請求項１記載の錆落とし液の製
造方法。2. The amount of thioglycolic acid mixed with water subjected to magnetic field treatment and / or ozone treatment is 0.5 to 5% by weight.
The method for producing a rust-removing liquid according to claim 1, wherein
ル酸を用いることを特徴とする請求項１又は２記載の錆
落とし液の製造方法。3. The method for producing a rust remover according to claim 1 or 2, wherein thioglycolic acid is used among the thioglycolic acids.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6222499A JP2821993B2 (en) | 1994-03-14 | 1994-08-24 | Rust remover manufacturing method |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6899294 | 1994-03-14 | ||
| JP6-68992 | 1994-03-14 | ||
| JP6222499A JP2821993B2 (en) | 1994-03-14 | 1994-08-24 | Rust remover manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07305185A true JPH07305185A (en) | 1995-11-21 |
| JP2821993B2 JP2821993B2 (en) | 1998-11-05 |
Family
ID=26410176
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6222499A Expired - Fee Related JP2821993B2 (en) | 1994-03-14 | 1994-08-24 | Rust remover manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2821993B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104911612A (en) * | 2015-06-13 | 2015-09-16 | 常州大学 | Biological aeration derusting method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01172584A (en) * | 1987-12-26 | 1989-07-07 | Sumishiyou Akua Kk | Rust removing and preventing method in pipeline in building or the like |
| JPH02227193A (en) * | 1988-10-11 | 1990-09-10 | Takeo Oe | Method for preventing generation of rust and/or scale in water channel |
| JPH03264681A (en) * | 1990-03-12 | 1991-11-25 | Kooken:Kk | Rust prevention equipment for water supply and discharge pipe |
-
1994
- 1994-08-24 JP JP6222499A patent/JP2821993B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01172584A (en) * | 1987-12-26 | 1989-07-07 | Sumishiyou Akua Kk | Rust removing and preventing method in pipeline in building or the like |
| JPH02227193A (en) * | 1988-10-11 | 1990-09-10 | Takeo Oe | Method for preventing generation of rust and/or scale in water channel |
| JPH03264681A (en) * | 1990-03-12 | 1991-11-25 | Kooken:Kk | Rust prevention equipment for water supply and discharge pipe |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104911612A (en) * | 2015-06-13 | 2015-09-16 | 常州大学 | Biological aeration derusting method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2821993B2 (en) | 1998-11-05 |
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