WO2019068482A1 - Installation de décapage avec dispositif de circulation - Google Patents

Installation de décapage avec dispositif de circulation Download PDF

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Publication number
WO2019068482A1
WO2019068482A1 PCT/EP2018/075568 EP2018075568W WO2019068482A1 WO 2019068482 A1 WO2019068482 A1 WO 2019068482A1 EP 2018075568 W EP2018075568 W EP 2018075568W WO 2019068482 A1 WO2019068482 A1 WO 2019068482A1
Authority
WO
WIPO (PCT)
Prior art keywords
pickling
circulation
circulation tank
tank
plant according
Prior art date
Application number
PCT/EP2018/075568
Other languages
German (de)
English (en)
Inventor
Michael Haentjes
Jörg Oberdiek
Siegfried ENGEL
Original Assignee
Sms Group Gmbh
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 Sms Group Gmbh filed Critical Sms Group Gmbh
Publication of WO2019068482A1 publication Critical patent/WO2019068482A1/fr

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Classifications

    • 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
    • C23G3/00—Apparatus for cleaning or pickling metallic material
    • C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously
    • 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
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C23G1/08—Iron or steel

Definitions

  • the present invention relates to a pickling plant for strip steel, in particular for normal steel, stainless steel and electrical steel, comprising a circulation device with a circulation tank in which a pickling liquid is stored and via pipes by means of pumps in at least one pickling tank for pickling the steel strip in the circuit is conductive.
  • Such pickling plants of the above type are required to remove oxidations and scale from hot-rolled steel strip.
  • the process is based on the band going through acid baths, which removes the rust on the surface.
  • the pickling mainly depends on the chemical composition of the steel strip, the temperature of the pickling baths, the turbulence, the acid concentration and the length of the tanks.
  • the steel belts are pulled through the pickling tank filled with the pickling liquid in a continuous process.
  • the pickling tank is not completely filled, but it remains above the liquid level (pickling tank is filled to Abquetschrollenhimsten) a free space.
  • the pickling liquid can also be sprayed onto the steel strips to be pickled.
  • the pickling liquid draining from the pickled steel strip initially remains in the pickling tank before being returned to the circulation tank (which is usually done by free return).
  • DE 196 02 303 C2 discloses a method for pickling material webs made of steel, in particular stainless steel, in which the band has at least one pickling bath with min. at least one pickling acid, wherein the acid concentration and / or acid composition is automatically selected depending on the material quality, the pretreatment and the operating parameters of the pickling.
  • the acid dosage can be effected by feeding from storage containers with different acid concentration and / or acid composition. This is done solely to be able to change the actual pickling media and to adjust the steel grades to be processed.
  • austenitic or ferritic steel qualities require pickling media with different concentrations of the pickling acids used.
  • the pickling acids are stored in different tanks and fed to the pickling tank as required.
  • the Beizmatikeitsniklauf is assigned at least a two ter circulation tank, which is fluidly connected to the first circulation tank, wherein the first circulation tank and the second circulation tank can be shut off from Beiquing liquid circuit, so that in each case a circulation tank is switched to the Beizillonkeitsniklauf during pickling ,
  • the first circulation tank can be shut off from the second circulation tank and the second circulation tank can be shut off from the first circulation tank by means of shut-off means.
  • the pickling liquid between the two circulation tanks can also be spatially separated and the pickling liquid in a small pickling liquid, in which only one circulation tank is operatively connected to the pickling tank, are performed.
  • the pickling liquid is conducted in a large Beizflüs stechniksnikonne, in which then both circulation tanks are connected in series or pa rallel.
  • first circulation tank and the second circulation tank can be alternately connected to the pickling liquid circuit.
  • the circulation tanks in the installation position below a conical bottom is assigned, in which accumulating during pickling and insoluble in the pickling liquid components are accumulated.
  • the bottom of the circulation tank at least one Altklarepumpe be assigned, via which the pickling on falling insoluble residues via a piping system for further treat- ment are derivable.
  • the derived residues are then fed through fresh pickling liquid via an inlet to the circulation tank (additional tank), ie. in that the residues derived from the circulation tank in the circulation tank can be replaced by fresh pickling liquid via an inlet.
  • a quantitative measurement is conceivable which replaces the discharged amount of pickling liquid by a corresponding amount of new unused or regenerated pickling liquid.
  • the system can always be ren with the optimal amount of pickling gefah ren and this both in physical / chemical terms (necessary amount for optimal Beizergebn is) and in economic terms, to no more than the necessary amount of pickling liquid in the pickling liquid to have to lead.
  • an additional sedimentation together with filter unit (for example chamber filter press) can be assigned to the circulation tanks (additional tanks).
  • the pickling liquid can be pumped from the circulation tanks into the pickling tank in an advantageous embodiment of the pickling plant according to the invention with vertical pumping.
  • the circulation tanks can be associated with heat exchangers. This would, for example, facilitate cleaning, which would occur if one of the circulation tanks is shut off from the pickling liquid circuit in order to be able to discharge the contaminants from the conical bottom of the circulation tank.
  • the heat exchanger (s) can be checked and cleaned.
  • the above-mentioned pumps may be formed as a vertical and / or Horizontalpum pen.
  • Fig. 1 is a schematic circuit diagram of an embodiment of the pickling plant according to the invention with two
  • Circulation tanks being in the circulation tank inside
  • FIG. 2 is a schematic circuit diagram of the pickling plant according to the invention according to FIG. 1, wherein the heat exchangers in this embodiment are outside the
  • the pickling plant 10 comprises a pickling tank 1 1, in which the strip steel / steel strip 12 to be pickled is impinged with a pickling liquid 13 be.
  • the pickling liquid is guided into a pickling liquid circuit, as shown by the arrows 14, 15, and 16, 17.
  • the pickling plant 10 comprises at least a first circulation tank 18 and a second circulation tank 19.
  • the pickling liquor is stored in the circulation tanks 18 and 19 and made available to the pickling tank 11 as needed via a pump system 20.
  • the pumping system can be operated with vertical or horizontal pumps.
  • the Beiz mill is speed 13 via a nozzle system 21, 21 a applied to the steel strip 12 to be pickled.
  • the circulation tanks 18 and 19 are associated with heat exchangers 22 and 23 in order to keep the pickling liquid 13 in the optimum temperature range for the pickling process.
  • the circulation tanks 18 and 19 have a conically shaped bottom 24 and 25. This has the advantage that the insoluble constituents 29 accumulating in the pickling liquid during the pickling process can accumulate concentrated in the soil region.
  • the insoluble constituents 29 are pumped via a desludging 26 and 27 (Schlammentleeru ng) in the bottom region of the circulation tanks 1 8 and 19 by means of Altklarepumpen / Entschlammungspumpen (Grobstoffpum pen / sludge pumps) 28, 28 a for further reason.
  • the pickling plant 10 is by no means limited to a double tank system.
  • Conceivable are a variety of circulation tanks, which can be switched on and off one after the other in the pickling liquid system.
  • at least one circulation tank with fresh, purified admixing liquid 13 can always be made available to the pickling tank.
  • it is provided to arrange a heat exchanger 22a, 23a in the pipelines for the pickling liquid circuit 14, 15.
  • the lines for the Beizitmaykeitsniklauf 14, 15 may be provided with a bypass (not shown) in order to bypass the heat exchanger 22a, 23a, if necessary.
  • External heat exchangers 22a, 23a have the advantage that they are flowed through better than immersed, ie. H . the heat transfer is more effective. There - they are smaller, cheaper and more accessible than the immersion heat exchangers 22, 23 according to FIG. 1.
  • the circulation tank 18, 19 located in "sedimentation" is not heated, since the return only takes place in the tank in circulation. Either it is accepted that the sedimentation tank, the pickling liquid 13 is slightly colder by heat radiation, or you leads the circulation tank 18, 19 heat, z. B. over a heated container wall and thus prevents cooling. As a result, the pickling liquid can be kept in the optimum temperature range.
  • the first circulation tank 18 is conventionally operated in cooperation with the pickling tank 11. As soon as the concentration of insoluble constituents reaches a critical threshold, the system is switched to the second circulation tank 19, which is in a standby position. This can be done fully automatically.
  • the second circulation tank 19 is filled with a largely free of insoluble constituents pickling acid 13 and therefore can carry out the pickling process immediately wei.
  • the insoluble constituents in the first circulation tank 18 settle in the tapered bottom 24.
  • the sludge of insoluble matter collected in the funnel (conical bottom) of the circulation tank 18 is pumped by means of sludge 28, 28a and subjected to further treatment (e.g. Sedimentation) supplied.
  • the withdrawn Beiz thoroughlykeitsmenge is replenished by appropriate fresh pickling acid 13 (regenerated, fresh or filtered acid).
  • the first circulation tank 18 is again available for production and the second circulation tank 19 can be deslimed according to the above-described pattern.
  • the accumulated amount of insoluble components in the etching fluid circuit 14, 15 and 16, 17 is predictively calculated via an appropriate model or the insoluble components are measured online, for example via an optical turbidity measurement.
  • the sludge level in the circulation tank 18, 19 after the settling process can be determined by means of suitable measurement in order to minimize the pickling liquid 13 to remove from the system.
  • a treatment of the sludge in a suitable downstream sedimentation would also with regard to the resource savings (pickling acid) advantage.

Landscapes

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

Abstract

La présente invention concerne une installation de décapage (10) pour feuillard d'acier, en particulier pour acier normal, acier inoxydable et acier électrique, comprenant un dispositif de circulation avec un premier réservoir de circulation (18) dans lequel un liquide décapant (13) est stocké et dirigé au moyen de pompes (20) dans des conduites jusque dans au moins un récipient de décapage (11) afin de décaper le feuillard d'acier (12), dans un circuit de liquide décapant (14, 15, 16, 17). Selon l'invention, au moins un second réservoir de circulation (19) est associé au circuit de liquide décapant (14, 15, 16, 17), ledit second réservoir de circulation étant raccordé hydrauliquement au premier réservoir de circulation (18), le premier réservoir de circulation (18) et le second réservoir de circulation (19) pouvant être alternativement isolés du circuit de fluide décapant (14, 15, 16, 17) pour que respectivement un réservoir de circulation (18, 19) soit raccordé au circuit de liquide décapant (14, 15, 16, 17) pendant le décapage.
PCT/EP2018/075568 2017-10-05 2018-09-21 Installation de décapage avec dispositif de circulation WO2019068482A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017123152.8A DE102017123152A1 (de) 2017-10-05 2017-10-05 Beizanlage mit Zirkulationsvorrichtung
DE102017123152.8 2017-10-05

Publications (1)

Publication Number Publication Date
WO2019068482A1 true WO2019068482A1 (fr) 2019-04-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2018/075568 WO2019068482A1 (fr) 2017-10-05 2018-09-21 Installation de décapage avec dispositif de circulation

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DE (1) DE102017123152A1 (fr)
WO (1) WO2019068482A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112342557A (zh) * 2020-10-14 2021-02-09 首钢京唐钢铁联合有限责任公司 一种酸洗系统及其清堵方法
CN114318355B (zh) * 2021-11-19 2024-02-13 盐城市冉峰机械设备制造有限公司 一种钢帘线酸洗装置及其清洗方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2711814A1 (de) * 1977-03-18 1978-09-21 Steuler Industriewerke Gmbh Beizvorrichtung mit einem nacheinander mit verschiedenen behandlungsfluessigkeiten beschickbaren, das beizgut aufnehmenden behandlungsbehaelter
US5510018A (en) * 1993-11-30 1996-04-23 Danieli & C. Officine Meccaniche Spa System to re-circulate treatment material in processes of surface treatment and finishing
DE19602303C2 (de) 1995-02-15 2001-11-15 Andritz Patentverwaltung Verfahren und Vorrichtung zur Beize von Materialbahnen aus Stahl
CN1683593A (zh) * 2004-04-15 2005-10-19 三菱日立制铁机械株式会社 酸洗设备

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2711814A1 (de) * 1977-03-18 1978-09-21 Steuler Industriewerke Gmbh Beizvorrichtung mit einem nacheinander mit verschiedenen behandlungsfluessigkeiten beschickbaren, das beizgut aufnehmenden behandlungsbehaelter
US5510018A (en) * 1993-11-30 1996-04-23 Danieli & C. Officine Meccaniche Spa System to re-circulate treatment material in processes of surface treatment and finishing
DE19602303C2 (de) 1995-02-15 2001-11-15 Andritz Patentverwaltung Verfahren und Vorrichtung zur Beize von Materialbahnen aus Stahl
CN1683593A (zh) * 2004-04-15 2005-10-19 三菱日立制铁机械株式会社 酸洗设备

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