EP0079987B1 - Verfahren und Vorrichtung zur Rückgewinnung einer Waschflüssigkeit und von Wärme, die im Abwasser von Verfahren zur Behandlung von Metalloberflächen enthalten ist - Google Patents

Verfahren und Vorrichtung zur Rückgewinnung einer Waschflüssigkeit und von Wärme, die im Abwasser von Verfahren zur Behandlung von Metalloberflächen enthalten ist Download PDF

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Publication number
EP0079987B1
EP0079987B1 EP19810305502 EP81305502A EP0079987B1 EP 0079987 B1 EP0079987 B1 EP 0079987B1 EP 19810305502 EP19810305502 EP 19810305502 EP 81305502 A EP81305502 A EP 81305502A EP 0079987 B1 EP0079987 B1 EP 0079987B1
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EP
European Patent Office
Prior art keywords
washing tank
tank
hot water
water washing
cold 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.)
Expired
Application number
EP19810305502
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English (en)
French (fr)
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EP0079987A1 (de
Inventor
Aisaburo Yagishita
Kinshiro Kusumi
Yoshio Tsuji
Noboru Mori
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.)
Sanshin Mfg Co Ltd
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Sanshin Mfg Co Ltd
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Publication date
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Priority to EP19810305502 priority Critical patent/EP0079987B1/de
Priority to DE8181305502T priority patent/DE3173910D1/de
Publication of EP0079987A1 publication Critical patent/EP0079987A1/de
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Publication of EP0079987B1 publication Critical patent/EP0079987B1/de
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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D21/00—Processes for servicing or operating cells for electrolytic coating
    • C25D21/16—Regeneration of process solutions
    • C25D21/22—Regeneration of process solutions by ion-exchange
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts

Definitions

  • the invention relates to a method and apparatus for recovery and recycling of a washing liquid and heat contained in the washings discharged from a metal surface treatment process.
  • This invention has been accomplished with a view to providing a solution to the aforesaid problem.
  • a main object of this invention is therefore to provide a method and apparatus which combine recycling of washing liquids with that of heat.
  • Another object of this invention is to stabilize the quality of water supplied into and held in cold water and hot water washing tanks for the purpose of preventing deterioration of the metal products to be treated due to variations in quality of the water supplied.
  • a method for recovery and recycling of a washing liquid and heat contained in the washings discharged from a metal surface treatment process comprising filtering the washings discharged from a hot water washing tank, subjecting the hot filtrate to a heat exchange and to an ion exchange and then supplying the resultant cooled pure water to a cold water washing tank, said heat exchange being carried out with cold water discharged from said cold water washing tank and the resultant heated water being supplied to said hot water washing tank.
  • a method for recovery and recycling of a washing liquid and heat contained in the washings discharged from a metal surface treatment process comprising filtering the liquid discharged from a cold water washing tank, subjecting the resulting filtrate to ion exchange to obtain pure water, heating the obtained pure water by heat exchange with hot water, and feeding the thus heated water to a hot water washing tank, said hot water for said heat exchange being hot water discharged from said hot water washing tank and being fed, after being cooled in said heat exchange, to said cold water washing tank.
  • a method for recovery and recycling of a washing liquid and heat contained in the washings discharged from a metal surface treatment process comprising subjecting hot water dischaged from a hot water washing tank to heat exchange with cold, pure water, introducing the resultant cooled water into a cushion tank together with impurities-containing cold water coming from a cold water washing tank, filtering the liquid contained in said cushion tank, subjecting the resultant filtrate to ion exchange to obtain pure water, and heating a part of said pure water by said heat exchange with said hot water and supplying said heated pure water to said hot water washing tank while supplying another part of said pure water to said cold water washing tank without application of heat.
  • an apparatus for recovery and recycling of a washing liquid and heat contained in the washings discharged from a metal surface treatment process comprising a cold water washing tank and a hot water washing tank used in said metal surface treatment process, and cushion tanks operable- in association with said washing tanks respectively, the cushion tank, operable in association with said cold water washing tank being in communication with said hot water washing tank through a heat exchanger, while the cushion tank operable in association with said hot water washing tank is in communication with said cold water washing tank through a filter, said heat exchanger and an ion exchanger.
  • an apparatus for recovery and recycling of a washing liquid and heat contained in the washings discharged from a metal surface treatment process comprising a hot water washing tank for washing the surface of a metal to be treated, said tank having a hot water recovery pipe located on one side and a hot water discharge pipe on the other side; a cushion tank with which the other end of said hot water discharge pipe communicates; a filter connected to said cushion tank by means of a pipe; a filtrate reservoir connected to said filter by means of a pipe; a heat exchanger connected to said filtrate reservoir by means of a pipe; which pipe passes through said heat exchanger to form communication between said filtrate reservoir and an ion exchanger; a cold water washing tank connected to said ion exchanger by means of a pipe; a cushion tank connected to said cold water washing tank by means of a cold water discharge pipe; and a pipe passing through said heat exchanger to form communication between the second-mentioned cushion tank and the said hot water washing tank.
  • an apparatus for recovery and recycling of a washing liquid and heat contained in the washings discharged from a metal surface treatment process comprising a cold water washing tank and a hot water washing tank used in said metal surface treatment process, and cushion tanks operable in association with said washing tanks respectively, the cushion tank operable in association with said hot water washing tank being in communication with said cold water washing tank through a heat exchanger, while the cushion tank operable in association with said cold water washing tank is in communication with said hot water washing tank through a filter, an ion exchanger and said heat exchanger.
  • an apparatus for recovery and recycling of a washing liquid and heat contained in the washings discharged from a metal surface treatment process comprising a cold water washing tank and a hot water washing tank, and cushion tanks operable in association with said washing tanks respectively each cushion tank being connected to its respective washing tank to receive water therefrom, the hot water cushion tank being connected through a heat exchanger to the cold water cushion tank and the cold water cushion tank being connected through a filter to the input side of an ion exchanger the output side of which is connected through said heat exchanger to said hot water washing tank so that pure water from the ion exchanger can be heated in the heat exchanger before reaching the hot water washing tank, and the output side of the ion exchanger also being connected to the cold water washing tank so that pure unheated water can be supplied to the cold water washing tank.
  • connection from the output side of the ion exchanger to said cold water washing tank is made by way of a bypass pipe connected at one end to the connection between the ion exchanger and the heat exchanger and connected at its other end to said cold water washing tank.
  • a filter in the flow path from the hot water cushion tank to the heat exchanger.
  • a hot water washing tank 1 includes therein a fresh steam inlet pipe 2, and has a hot water recovery pipe 3 located on one side and a hot water discharge pipe 4 on the other side. The other end of pipe 4 is then in communication within a cushion tank 5.
  • the cushion tank 5 includes therein a water suction pipe 6 which extends through a pump 7 to a filter 8.
  • the filter 8 communicates with a filtrate reservoir 10 via a discharge pipe 9.
  • the filtrate reservoir 10 is in communication with a pipe 12 having a pump 11 on its way, which pipe passes through heat exchanger 13.
  • a cold water recovery pipe 15 then connects the ion exchanger 14 to a water washing tank 16.
  • the washing tank 16 is connected on its one side with one end of a cold water discharge pipe 17 which is, in turn, connected on its other end within a cushion tank 18.
  • the water washing tank 16 then discharges contaminated cold water (ca. 40°C) which passes through the pipe 17, cushion tank 18, and pipe 19 and exchanges heat in the heat exchanger 13, with hot water from the reservoir 10, the resulting hot water (ca. 80°C) being fed into the hot water washing tank 1.
  • the tank 1 discharges hot water containing contaminants into the cushion tank 5 through the pipe 4. Subsequently, the hot water is supplied from the suction pipe 6 into the filter 8 via the pump 7, where it is filtered off. The resulting filtrate is discharged into the reservoir 10 via the pipe 9.
  • the filtrate which leaves the reservoir 10 is supplied into the heat exchanger 13 via the pipe 12 by means of the pump 11, where it exchanges heat with cold water.
  • the filtrate which is now adjusted to a temperature suitable for ion exchange is fed into the ion exchanger 14.
  • the ion exchanger 14 permits removal of cations (Ca ++ , Na + , etc.) and anions (S04-- etc.) contained in the filtrate through ion exchange until it is converted into pure water.
  • a hot water washing tank 101 includes therein a fresh steam inlet pipe 102, and has a hot water recovery pipe 103 located on one side and a hot water discharge pipe 104 on the other side. The other end of the pipe 104 is then in communication within a cushion tank 105.
  • the cushion tank 105 communicates with one side of a cold water washing tank 108 via a pipe 107 passing through a heat exchanger 106.
  • a pump 109 is mounted on the pipe 107 between the tank 105 and the heat exchanger 106.
  • a cold water discharge pipe 110 communicates at its one end with the other side of the cold water washing tank 108 and at its other end with a cushion tank 111.
  • the cushion tank 111 includes therein a water suction pipe 112 which terminates in a filter 114 via a pump 113.
  • the filter 114 communicates with a filtrate reservoir 116 via a discharge pipe 115.
  • the reservoir 116 communicates with a ion exchanger 119 via a pipe 118 having a pump 117 on its way.
  • the ion exchanger 119 communicates with a pipe 120 passing through the heat exchanger 106, said pipe 120 being connected with the hot water recovery pipe 103. In this way the washing liquid and heat recycling system, generally shown at A, is assembled.
  • the hot water washing tank 101 then discharges contaminated hot water (ca. 80°C) which passes through the pipe 104, cushion tank 105 and pipe 107 and exchanges heat with cold, pure water in the heat exchanger 106 with the resulting cold water (ca. 40°C) being fed into the cold water washing tank 108.
  • contaminated hot water ca. 80°C
  • the hot water washing tank 101 then discharges contaminated hot water (ca. 80°C) which passes through the pipe 104, cushion tank 105 and pipe 107 and exchanges heat with cold, pure water in the heat exchanger 106 with the resulting cold water (ca. 40°C) being fed into the cold water washing tank 108.
  • the tank 108 discharges cold water containing contaminants into the cushion tank 111 through the pipe 110. Subsequently, the cold water is supplied from the suction pipe 112 into the filter 114 via the pump 113, where it is filtered off. The resulting filtrate is discharged into the reservoir 116 via the pipe 115.
  • the filtrate which leaves the reservoir 116 is supplied into the ion exchanger 119 via the pipe 118 by means of the pump 117, where it is converted to pure water by ion exchange.
  • the filtrate which is supplied to the ion exchanger 119 is at a temperature suitable for ion exchange, the ion exchanger 119 functioning in the same manner as mentioned in connection with the ion exchanger 14.
  • Purified cold water (approx. 35°C), from the ion exchanger 119 is fed into the heat exchanger 106, where it exchanges heat with the above-mentioned hot water (approx. 80°C) containing contaminants, and becomes heated pure water (approx. 75°C). This pure water is then fed to the tank 101 where it is brought to a higher temperature by blowing of fresh steam or other means.
  • the third embodiment is similar to the second embodiment except for the provision of a bypass pipe 122 extending from between the heat exchanger 106 and the ion exchanger 119 into the cold water washing tank 108.
  • Further pipe 107 connects heat exchanger 106 with pipe 110 instead of connecting heat exchanger 106 with cold water washing tank 108.
  • a filter 121 may be disposed between the pump 109 and the heat exchanger 106 to prevent the exchanger 106 from being scaled.
  • the third embodiment works in a manner that is explained with reference to the second embodiment, except that a part of pure water obtained by ion exchange is fed back to the hot water washing tank 101 via the heat exchanger 106, while another part of pure water is fed back to the cold water washing tank 108 through the bypass pipe 122. More specifically, an amount of cold water (ca. 35°C) converted by ion exchange into pure water is supplied into the heat exchanger 106, where it exchanges heat with the hot water (ca. 80°C) containing impurities and becomes pure water having a temperature on the order of about 75°C. This pure water is then fed back to the hot water washing tank 101 and brought to a higher temperature by blowing of fresh steam or other means.
  • the remaining amount of pure water is fed back to the cold water washing tank 108 through the bypass pipe 122. Further cooled water from the heat exchanger 106 is fed to the cushion tank 111 by way of the pipe 107 which communicates with the pipe 110 between the tanks 108 and 111.
  • a washing liquid is recycled many times and no need of such supply of a constant amount of water as required in the prior art. This results in water savings and efficient washing.
  • Alternate use of the cold water in the cold water washing tank and the hot water in the hot water washing tank for heat exchange also leads to simplifications in the equipment involved and decreases in the amount of steam introduced into the hot water washing tank, and is preferable in view of energy savings.
  • the quality of the washing water in both tanks can be stabilized to prevent deterioration of the metal products to be treated. As there is no fear that clogging of the filtering material may take place, the operation for washing it can be simplified.
  • washing water to a temperature suitable for ion exchange is done through heat exchange, and the number of washing the filtering material is considerably reduced.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Electrochemistry (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Cleaning By Liquid Or Steam (AREA)

Claims (9)

1. Verfahren zum Rückgewinnen und Zurückführen einer Waschflüssigkeit und von Wärme, die im Abwasser von Verfahren zum Behandeln von Metalloberflächen enthalten ist, wobei das von einem Heißwaschwasser tank abgegebene Abwasser gefiltert wird, das heiße Filtrat durch einen Wärmeaustauscher und einen lonenaustauscher geführt wird, und dann das erhaltene gekühlte reine Wasser in einen Kaltwaschwassertank geleitet wird, wobei der Wärmeaustausch mit kaltem, von dem Kaltwaschwassertank abgegebenen Wasser durchgeführt wird und das erhaltene erhitzte Wasser in den Heißwaschwassertank geleitet wird.
2. Vorrichtung zum Rückgewinnen und Zurückführen einer Waschflüssigkeit und von Wärme, die im Abwasser von Verfahren zum Behandeln von Metalloberflächen enthalten ist, mit einem Kaltwaschwassertank und einem Heißwaschwassertank, die in dem Verfahren zum Behandeln von Metalloberflächen verwendet werden, mit Auffangbecken, die im Zusammenhang mit den Waschtanks verwendbar sind, wobei das im Zusammenhang mit dem Kaltwaschwassertank verwendbare Auffangbecken über einen Wärmeaustauscher mit dem Heißwaschwassertank in Verbindung steht, während das im Zusammenhang mit dem Heißwaschwassertank verwendbare Auffangbecken über einen Filter, den Wärmeaustauscher und einen Ionenaustauscher mit dem Kaltwaschwassertank in Verbindung steht.
3. Vorrichtung zum Rückgewinnen und Zurückführen einer Waschflüssigkeit und von Wärme, die im Abwasser von Verfahren zum Behandeln von Metalloberflächen enthalten ist, mit einem Heißwaschwassertank zum Waschen der zu behandelnden Metalloberfläche, wobei dieser Tank an seiner einen Seite ein Heißwasserrückgewinnungsrohr und an seiner anderen Seite ein Heißwasserabflußrohr aufweist, mit einem Auffangbecken, mit dem das nadere Ende des Heißwasserablaufrohrs in Verbindung steht, mit einem über ein Rohr mit dem Auffangbecken verbundenen Filter, mit einem über ein Rohr mit dem Filter verbundenen Filtratreservoir, mit einem über ein Rohr mit dem Filtratreservoir verbundenen Wärmeaustauscher, wobei dieses Rohr zum Verbinden des Filtratreservoirs mit einem Ionenaustauscher durch den Wärmeaustauscher verläuft, mit einem über ein Rohr mit dem Ionenaustauscher verbundenen Kaltwaschwassertank, mit einem über ein Kaltwasserablassrohr mit dem Kaltwaschwassertank verbundenen Auffangbecken und mit einem Rohr, das zum Verbinden des zweitgenannten Auffangbeckens mit dem Heißwaschwassertank durch den Wärmeaustauscher verläuft.
4. Verfahren zum Rückgewinnen und Zurückführen einer Waschflüssigkeit und von Wärme, die im Abwasser von Verfahren zum Behandeln von Metalloberflächen enthalten ist, wobei die von einem Kaltwaschwassertank abgegebene Flüssigkeit gefiltert wird, das erhaltene Filtrat durch einen Ionenaustauscher geleitet wird, um reines Wasser zu erhalten, das erhaltene reine Wasser über einen Wärmeaustauscher mit heißem Wasser erhitzt wird und das so erhitzte Wasser einem Heißwaschwassertank zugeführt wird, wobei das heiße Wasser für den Wärmeaustauscher von dem Heißwaschwassertank abgelassen und nach Kühlung in dem Wärmeaustauscher dem Kaltwaschwassertank zugeführt wird.
5. Vorrichtung zum Rückgewinnen und Zurückführen einer Waschflüssigkeit und von Wärme, die im Abwasser von Verfahren zum Behandeln von Metalloberflächen enthalten ist, mit einem Kaltwaschwassertank und einem Heißwaschwassertank, die in dem Verfahren zum Behandeln von Metalloberflächen verwendet werden, und mit im Zusammenhang mit den Waschtanks verwendbaren Auffangbecken, wobei das im Zusammenhang mit dem Heißwaschwassertank verwendbare Auffangbecken über einen Wärmeaustauscher mit dem Kaltwaschwassertank in Verbindung steht, während das im Zusammenhang mit dem Kaltwaschwassertank verwendbare Auffangbecken über einen Filter, einen lonenaustauscher und den Wärmeaustauscher mit dem Heißwaschwassertank in Verbindung steht.
6. Verfahren zum Rückgewinnen und Zurückführen einer Waschflüssigkeit und von Wärme, die im Abwasser von Verfahren zum Behandeln von Metalloberflächen enthalten ist, wobei heißes Wasser aus einem Heißwaschwassertank mit kaltem, reinem Wasser zum Wärmeaustausch beaufschlagt wird, das erhaltene gekühlte Wasser zusammen mit verunreinigtem kalten Wasser aus einem Kaltwaschwassertank in ein Auffangbecken geleitet wird, die in dem Auffangbecken enthaltene Flüssigkeit gefiltert wird, das erhaltene Filtrat einem Ionenaustausch ausgesetzt wird, um reines Wasser zu erhalten, und ein Teil des reinen Wassers mit dem heißen Wasser über einen Wärmeaustauscher erhitzt und das erhitzte reine Wasser dem Heißwaschwassertank zugeführt wird, während ein anderer Teile des reinen Wassers ohne Anwendung von Wärme dem Kaltwaschwassertank zugeführt wird.
7. Vorrichtung zum Rückgewinnen und Zurückführen einer Waschflüssigkeit und von Wärme, die im Abwasser von Verfahren zum Behandeln von Metalloberflächen enthalten ist, mit einem Kaltwaschwassertank, einem Heißwaschwassertank und mit im Zusammenhang mit den Waschtanks verwendbaren Auffangbecken, wobei jedes Auffangbecken mit seinem entsprechenden Waschtank zum Zuführen von Wasser daraus verbunden ist, das Heißwasserauffangbecken mit dem Kaltwasserauffangbecken über einen Wärmeaustauscher und das Kaltwasserauffangbecken mit dem Einlaß eines Ionenaustauschers über ein Filter verbunden ist, wobei der Auslaß des Ionenaustauschers mit dem Heißwaschwassertank über den Wärmeaustauscher verbunden ist, so daß reines Wasser aus dem lonenaustauscher vor dem Erreichen des Heißwaschwassertanks in dem Wärmeaustauscher erhitzbar ist, und wobei der Auslaß des lonenaustauschers auch mit dem Kaltwaschwassertank verbunden ist, so daß reines, nicht erhitztes Wasser zum Kaltwaschwassertank zuführbar ist.
- 8. Vorrichtung nach Anspruch 7, mit einer ein Umleitungsrohr aufweisenden Verbindung zwischen dem Auslaß des Ionenaustauschers und dem Kaltwaschwassertank, wobei das Umleitungsrohr an einem Ende mit der Verbindung zwischen dem Ionenaustauscher und dem Wärmeaustauscher und am anderen Ende mit dem Kaltwaschwassertank verbunden ist.
9. Vorrichtung nach Anspruch 7 oder 8, mit einem Filter im Fließweg vom Heißwasserauffangbecken zum Wärmeaustauscher.
EP19810305502 1981-11-20 1981-11-20 Verfahren und Vorrichtung zur Rückgewinnung einer Waschflüssigkeit und von Wärme, die im Abwasser von Verfahren zur Behandlung von Metalloberflächen enthalten ist Expired EP0079987B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19810305502 EP0079987B1 (de) 1981-11-20 1981-11-20 Verfahren und Vorrichtung zur Rückgewinnung einer Waschflüssigkeit und von Wärme, die im Abwasser von Verfahren zur Behandlung von Metalloberflächen enthalten ist
DE8181305502T DE3173910D1 (en) 1981-11-20 1981-11-20 Method and apparatus for recycling washing liquid and heat contained in washings discharged from metal surfacing process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19810305502 EP0079987B1 (de) 1981-11-20 1981-11-20 Verfahren und Vorrichtung zur Rückgewinnung einer Waschflüssigkeit und von Wärme, die im Abwasser von Verfahren zur Behandlung von Metalloberflächen enthalten ist

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EP0079987A1 EP0079987A1 (de) 1983-06-01
EP0079987B1 true EP0079987B1 (de) 1986-02-26

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EP19810305502 Expired EP0079987B1 (de) 1981-11-20 1981-11-20 Verfahren und Vorrichtung zur Rückgewinnung einer Waschflüssigkeit und von Wärme, die im Abwasser von Verfahren zur Behandlung von Metalloberflächen enthalten ist

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103255466A (zh) * 2013-05-23 2013-08-21 中山中粤马口铁工业有限公司 一种镀铬薄钢板的含铬废水在线回收再利用装置及方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0132719B1 (de) * 1983-07-30 1988-03-09 Instytut Mechaniki Precyzyjnej Verfahren und Anordnung zum Betreiben eines Plattierbades in einem geschlossenen Kreislauf
DE3346249A1 (de) * 1983-12-21 1985-06-27 Walter 7758 Meersburg Holzer Verfahren zur behandlung von spuelwaessern, insbesondere zur entfernung umweltschaedlicher metallionen und vorrichtung zur ausuebung des verfahrens
US4572746A (en) * 1984-03-29 1986-02-25 Tiegel Manufacturing Co. Acid removal from dry charge battery plates

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2965441A (en) * 1956-11-29 1960-12-20 Du Pont Ion exchange for the recovery of chemicals
US3761381A (en) * 1966-10-18 1973-09-25 A Yagishita Plating waste recovery unit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103255466A (zh) * 2013-05-23 2013-08-21 中山中粤马口铁工业有限公司 一种镀铬薄钢板的含铬废水在线回收再利用装置及方法
CN103255466B (zh) * 2013-05-23 2015-12-02 中山中粤马口铁工业有限公司 一种镀铬薄钢板的含铬废水在线回收再利用装置及方法

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EP0079987A1 (de) 1983-06-01
DE3173910D1 (en) 1986-04-03

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