EP3029163B1 - Verfahren und System zur Behandlung eines Kohlenstoffstahlbandes, insbesondere zur Abbeizungsbehandlung - Google Patents

Verfahren und System zur Behandlung eines Kohlenstoffstahlbandes, insbesondere zur Abbeizungsbehandlung Download PDF

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Publication number
EP3029163B1
EP3029163B1 EP14195949.4A EP14195949A EP3029163B1 EP 3029163 B1 EP3029163 B1 EP 3029163B1 EP 14195949 A EP14195949 A EP 14195949A EP 3029163 B1 EP3029163 B1 EP 3029163B1
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EP
European Patent Office
Prior art keywords
steel strip
treatment
treatment liquid
section
spray
Prior art date
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Application number
EP14195949.4A
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English (en)
French (fr)
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EP3029163B9 (de
EP3029163A1 (de
Inventor
Thomas Marx
Wolfgang WALSDORF
Rafael Rituper
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John Cockerill UVK GmbH
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CMI UVK GmbH
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Application filed by CMI UVK GmbH filed Critical CMI UVK GmbH
Priority to EP14195949.4A priority Critical patent/EP3029163B9/de
Priority to ES14195949T priority patent/ES2742827T3/es
Priority to RU2017123254A priority patent/RU2691688C2/ru
Priority to CA2969369A priority patent/CA2969369A1/en
Priority to CN201580065566.5A priority patent/CN107002254A/zh
Priority to JP2017528780A priority patent/JP2018502985A/ja
Priority to PCT/EP2015/078311 priority patent/WO2016087493A1/en
Priority to US15/532,121 priority patent/US20170268113A1/en
Priority to BR112017011358A priority patent/BR112017011358A2/pt
Priority to MX2017007112A priority patent/MX2017007112A/es
Priority to KR1020177018058A priority patent/KR20170088433A/ko
Priority to EP15804431.3A priority patent/EP3227466A1/de
Publication of EP3029163A1 publication Critical patent/EP3029163A1/de
Publication of EP3029163B1 publication Critical patent/EP3029163B1/de
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0278—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular surface treatment
    • 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
    • C23G3/024—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously by a combination of dipping and spraying
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • 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
    • 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

Definitions

  • metal surfaces are treated by removing impurities such as typically rust or scale using treatment liquids, or pickle liquors, typically containing strong acids.
  • Scale itself is chemically quite similar to rust, being made up of iron and oxygen bonded together in various molecular arrangements. Like rust, scale typically develops at the surface of the steel product where the metal surface is exposed to air.
  • a pickling line having one or a plurality of acid baths, typically using a plurality of pickling tanks or pickling stations in a row, normally containing hydrochloric acid at a certain temperature in the range of typically between 50 °C and 95 °C.
  • hydrochloric acid e.g. hydrochloric acid, sulfuric acid, etc.
  • pickling agents or treatment liquid for pickling of e.g. ferrous metals.
  • the steel strip is pulled (or pushed or both pulled and pushed) through the pickling line - especially the treatment tank (or pickling tank) - at a certain speed (e.g. up to a couple of meters per second), then rinsed - typically with water -, and dried, normally air-dried.
  • the layer of scale dissolves in the acid.
  • the concentration of the acid itself becomes depleted during the pickling operation, so that it is necessary to add fresh acid continuously.
  • large amounts of spent acids are not only hazardous to the environment but usually also expensive.
  • the pickling operation should be carried out such that the regeneration of the acids spent can be realized in a comparatively simple and comparatively environmentally compatible manner.
  • HCI acts less aggressive to the base metal than H 2 SO 4 and consequently reducing the risk of over-pickling.
  • Today pickling lines are designed as shallow tank turbulence installations comprising of several consecutive pickling tanks.
  • the steel strip is pulled or pushed through the treatment tanks.
  • the complete pickling section is arranged as a cascade, i.e. the fresh or regenerated acid is added to the last treatment tank (i.e. the most downstream treatment tank according to the direction of movement of the steel strip) and is then processed in a countercurrent flow to the strip transport direction in order to maximize the use of the pickling acid.
  • wringer rolls are installed to remove the pickling acid from the strip to the greatest possible extend in order to enhance the cascade effect.
  • German patent disclosure DE 40 31 234 describes this technology.
  • JP H06 128774 A discloses a method for improving the sheet passing speed in a pickling vessel and to increase a production capacity by dripping or spraying hydrochloric acid before dipping into the pickling vessel. Furthermore, WO 02/081776 A1 discloses a process for pickling silicon containing electrical steel strip.
  • the pickling acid is injected on both sides of the tank creating a high turbulence between the strip surface and the pickling acid.
  • the pickling acid is then overflowing from the treatment tank to a circulation tank from where it is again injected into the treatment tank by means of pumps.
  • the high turbulence reduces the thickness of the liquid boundary layer on the strip surface resulting in an improved media and energy exchange and consequently reducing the required pickling time.
  • pickling Another well-known pickling method is the spray pickling, wherein the pickling acid is directly sprayed onto the strip surface using several spray nozzles installed both above and below the steel strip. The pickling acid is then collected in a circulation tank from where it is pumped to the spray nozzles and sprayed on to the strip surface again.
  • the spray nozzles are typically operated at a pressure above 1 bar. Due to the high impulse of the pickling acid sprayed onto the strip surface, the pickling efficiency and consequently the pickling time can be further improved.
  • this technology has never been used commercially in strip pickling lines.
  • the air dissolves in the pickling acid and oxidizes the FeCl 2 together with the HCI forming FeCl 3 .
  • HCI is a non oxidizing acid and therefore dissolving the base metal only slowly
  • FeCl 3 is an oxidizing agent, consequently increasing the dissolving speed of the base material.
  • the FeCl 3 concentration can reach 60 g/l and above.
  • FeCl 3 concentration in the pickling acid is the effect on the regeneration process of the spent pickling acid.
  • Spent pickling acid is typically regenerated using the pyrohydrolysis process.
  • FeCl 2 and FeCl 3 are converted back to HCI and Fe 2 O 3 .
  • FeCl 3 however has a much lower evaporation temperature than FeCl 2 and evaporates in the pyrohydrolysis reactor causing very fine Fe 2 O 3 particles below 1 ⁇ m in size when converted to Fe 2 O 3 . These fine particles are difficult to remove from the process off-gases causing high dust emissions.
  • the object of the present invention is achieved by a method according to claim 7.
  • the present invention is related to a process for chemical or electrochemical treatment of the surface of carbon steel, preferably strip shaped, wherein the material is treated with a pickling solution, preferably containing HCI, in one or more treatment tanks to remove an oxide scale layer which was previously formed during the hot rolling process of the metal strip (steel strip). This treatment is needed to reach a clean surface for either further processing it in a cold rolling process or for direct commercial use.
  • the process for chemical or electrochemical treatment of the surface of carbon steel is conducted using a pickling solution containing HCI as the only pickling agent, wherein the advantages of spray pickling are used to a maximum extend. Furthermore the process shall be controllable minimizing the risk of over-pickling so that the process can be realized in commercially used industrial scale pickling lines.
  • the spent acid of such a process is of a quality such that it can be treated in regeneration plants without additional investment considering in particular the FeCl 3 concentration in such spent acid.
  • the present invention is also directed to the possibility to revamp existing pickling lines, in particular the treatment tanks, and to use more efficient pickling technology with improved efficiency while re-using existing equipment in order to reduce installation costs, as for example acid circulation circuits etc. can be reused.
  • the present invention comprising a pickling process using an HCI containing pickling solution as the only pickling acid, wherein the material to be treated (i.e. the steel strip) is processed horizontally through one or more treatment tanks which are - in case of more than one treatment tank - operated as a pickling cascade.
  • the carbon steel strip is a continuous steel strip being oriented substantially horizontally, both in its longitudinal and transverse directions, at least at the treatment station.
  • steel strip is mostly horizontally oriented in its transverse direction but is allowed to be sagging in its longitudinal direction.
  • the height variation through the treatment station of the steel strip in its longitudinal direction may reach, e.g., up to 0,5 m.
  • the height variations of the steel strip in its longitudinal direction are also comprised up to 0,5 m.
  • the height variation of the steel strip in its longitudinal direction is comprised between up to 0,5 m throughout the complete treatment system, that potentially (and typically) comprises a plurality of treatment stations one after the other in the transport direction of the steel strip.
  • two pickling technologies are directly combined in one treatment tank (i.e. in one treatment station), i.e. using physically the same pickling acids (or the same treatment liquid) in both pickling sections (i.e. in both the spray section and the immersion section of the considered treatment station), as described.
  • the concentration of FeCl 3 can be kept below a critical level throughout the entire pickling process, guaranteeing a uniform pickling result without the risk of over-pickling.
  • the spent acid of such process can be easily regenerated in regeneration plants without additional investment to reach the legally required emission values, especially regarding dust emissions.
  • the efficiency of the treatment process is increased.
  • Tests have proven that a certain increase in the FeCl 3 concentration reduces the pickling time also for the dip pickling process. Consequently the process according to the present invention uses the advantage of the high efficient spray pickling process while the efficiency of the dip pickling process is improved as well, due to the common use of the pickling acid (i.e. the same treatment liquid is used both in the spray section and the immersion section of one and the same treatment station), and the consequently increased FeCl 3 level.
  • the pickling acid i.e. the same treatment liquid is used both in the spray section and the immersion section of one and the same treatment station
  • the design of the treatment line or pickling line is done in such a way that it is advantageously possible that the treatment stations or treatment tanks can easily replace existing treatment tanks in case of a required revamp (or refurbishment) while the circulation circuits can be reused.
  • This is mainly attributed to the fact that the spray pickling technology and the dip pickling technology (i.e. the spray section and the immersion section) are combined in one treatment tank (i.e. as part of one treatment tank).
  • the spray section comprises an effective spray length in parallel to the longitudinal direction of the steel strip such that - during the first step - the top and bottom surfaces of the steel strip receive the treatment liquid while being located within the effective spray length
  • the immersion section comprises an effective immersion length in parallel to the longitudinal direction of the steel strip such that - during the second step - the steel strip is immersed - with its top and bottom surfaces - in the treatment liquid while being located within the effective immersion length
  • the effective spray length and the effective immersion length are provided having a ratio of between and including 30:70 to 70:30, especially a ratio of 50:50.
  • the present invention it is thereby advantageously possible to flexibly adapt process parameters of a pickling line to fit best with the intended operative use after construction.
  • the time is defined during which the treatment liquid is effectively treating the steel strip in the immersion section.
  • the maximum time of spray pickling is defined in relation to the dip pickling time.
  • the effective spray length and hence the ratio of the effective spray length vs. the effective immersion length is varied by activating only a part of the spray nozzles.
  • the present invention it is thereby advantageously possible to vary the spray pickling time even during operational use of the pickling line, i.e. by de-activating a part of the spray nozzles.
  • By selectively activating and/or de-activating groups of spray nozzles is it advantageously possible according to the present invention, that also the manner or the intensity of the spray pickling step can be varied in operational use of the pickling line, e.g. by using only every second spray nozzle such that spray pickling is less intensive in the spray section.
  • the spray section is located - along the transport direction of the steel strip - upstream with respect to the immersion section. According to an alternative preferred embodiment of the present invention, the spray section is located - along the transport direction of the steel strip - downstream with respect to the immersion section.
  • the present invention it is thereby advantageously possible to provide the possibility of different pickling line architectures.
  • the first treatment station such that the spray section is located downstream with respect to the immersion section (i.e. the steel strip passes the immersion section first and afterwards the spray section)
  • the second treatment station such that the spray section is located upstream with respect to the immersion section (i.e. the steel strip passes the spray section (of the second treatment station) first and afterwards the dip section (of the second treatment station)):
  • these building blocks of two treatment stations can be either repeated or combined with other treatment stations or configurations of treatment stations.
  • the method comprises using - besides using the treatment liquid in the treatment station - a further treatment liquid in a further treatment station, the further treatment station comprising a further treatment tank with a further spray section and a further immersion section, and the further treatment station comprising a further common collection means for the further treatment liquid, wherein the method comprises transporting the steel strip continuously through the further treatment station in the transport direction such that
  • the two inventive treatment station are either located directly subsequent one after the other along the transport direction of the steel strip or the combination with one or a plurality of conventional treatment stations is provided such that the treatment station (or the first treatment station) is located upstream according to the transport direction of the steel strip with respect to a conventional treatment station (or with respect to a plurality of conventional treatment stations) and downstream with respect to this or these conventional treatment station(s) is located the further treatment station (or second treatment station) according to the present invention.
  • the treatment liquid and/or the further treatment liquid comprises
  • the present invention also relates to a system according to claim 1.
  • the present invention it is thereby advantageously possible to provide a system (or a treatment station) that requires comparatively low installation costs as well as reduced maintenance costs. According to the present invention, it is advantageously possible to combine the advantages of spray pickling and dip pickling and to minimize the risk of over-pickling. It is furthermore advantageous that the spent acid of such a system is of a quality such that it can be treated in regeneration plants without additional investment considering in particular the FeCl 3 concentration in such spent acid.
  • the spray section comprises an effective spray length in parallel to the longitudinal direction of the steel strip such that the top and bottom surfaces of the steel strip receive the treatment liquid while being located within the effective spray length
  • the immersion section comprises an effective immersion length in parallel to the longitudinal direction of the steel strip such that the steel strip is immersed - with its top and bottom surfaces - in the treatment liquid while being located within the effective immersion length
  • the effective spray length and the effective immersion length are provided having a ratio of between and including 30:70 to 70:30, especially a ratio of 50:50.
  • the spray section is located - along the transport direction of the steel strip - upstream with respect to the immersion section.
  • the spray section is located - along the transport direction of the steel strip - downstream with respect to the immersion section.
  • the treatment tank in a very cost effective manner such that especially the volume of the treatment tank is comparably small (and hence less treatment liquid is to be used).
  • the treatment liquid is pumped through the common collection means (or circulation tank) that is separated from the treatment tank.
  • the length of the treatment station is preferably 20 m or less, preferably between 16 m and 20 m.
  • the treatment station comprising both the spray section and the immersion section is preferably assembled using two main components of the treatment tank such that the treatment tank is - after assembling the two main components - integrally formed using the two main components.
  • each of the main components have a maximum length of 11,6 m, i.e. the two main components have a length of 11, 6 m or less.
  • transport these main components of the treatment tank, used in a treatment station according to the inventive method such that no welding of the two main components is required.
  • the main components of the treatment tank are slid into one another. This enables a much faster setup of the treatment station which is especially advantageous in case of re-furbishing existing pickling lines, as the down-time due to the refurbishment can be considerably reduced.
  • the system comprises - besides the treatment liquid in the treatment station - a further treatment liquid in a further treatment station, the further treatment station comprising a further treatment tank with a further spray section and a further immersion section, and the further treatment station comprising a further common collection means for the further treatment liquid, wherein the system is configured such that the steel strip is transported continuously through the further treatment station in the transport direction such that
  • the system comprises - besides the treatment liquid in the treatment station and the further treatment liquid in the further treatment station - a third treatment liquid in a third treatment station, the third treatment station comprising a third treatment tank with a third spray section and a third immersion section, and the third treatment station comprising a third common collection means for the third treatment liquid.
  • the system comprises - besides the treatment liquid in the treatment station, the further treatment liquid in the further treatment station, and the third treatment liquid in the third treatment station - a fourth treatment liquid in a fourth treatment station, the fourth treatment station comprising a fourth treatment tank with a fourth spray section and a fourth immersion section, and the fourth treatment station comprising a fourth common collection means for the fourth treatment liquid.
  • the combination of five treatment stations according to the present invention is possible and preferred according to the present invention.
  • the treatment liquid and/or the further treatment liquid and/or the third treatment liquid comprises
  • FIG 1 schematically illustrates a treatment system comprising three different treatment stations 3, 31, 32 as an example of a pickling line according to the present invention.
  • all three treatment stations 3, 31, 32 represent treatment stations according to the present invention, i.e. having a treatment tank with both a spray section and an immersion section such that a common collection means and the same treatment liquid is used for the treatment of the steel strip in both the respective spray section and the immersion section.
  • all three treatment stations 3, 31, 32 are realized either according to a first embodiment of the present invention, represented in Figure 2 for the exemplary case of the treatment station being represented by reference sign 3, or according to a second embodiment of the present invention, represented in Figure 3 for the exemplary case of the treatment station being represented by reference sign 3.
  • a part of the three treatment stations 3, 31, 32 is or are realized according to the first embodiment of the present invention ( Figure 2 ) and another part is or are realized according to the second embodiment of the present invention ( Figure 3 ).
  • the terms treatment station' and 'first treatment station' as well as 'further treatment station' and 'second treatment station' are used synonymously and only aim to differentiate the treatment stations from one another.
  • the naming convention typically (but not necessarily) relates to the location of a treatment station along the transport direction of the steel strip, the transport direction being represented by reference sign 2.
  • a treatment station (or first treatment station) 3 is located upstream of a further treatment station (or second treatment station) 31.
  • the further treatment station (or second treatment station) 31 is located upstream of a third treatment station 32.
  • the treatment station (or first treatment station) 3 comprises a treatment tank (or first treatment tank) 4, and a common collection means (or first common collection means) 5.
  • the further treatment station (or second treatment station) 31 comprises a further treatment tank (or second treatment tank) 41, and a further common collection means (or second common collection means) 51.
  • the third treatment station 32 comprises a third treatment tank 42, and a third common collection means 52.
  • all tree treatment stations 3, 31, 32 each have a spray section and an immersion section as part of their respective treatment tank 4, 41, 42, i.e.
  • the treatment station (or first treatment station) 3 has a spray section (or first spray section) and an immersion section (or first immersion section) using a treatment liquid (or first treatment liquid)
  • the further treatment station (or second treatment station) 31 has a further spray section (or second spray section) (not depicted in Figure 1 ) and a further immersion section (or second immersion section) (not depicted in Figure 1 ) using a further treatment liquid (or second treatment liquid)
  • the third treatment station 32 has a third spray section (not depicted in Figure 1 ) and a third immersion section (not depicted in Figure 1 ) using a third treatment liquid.
  • the present invention is schematically shown in Figures 2 .
  • Figure 2 schematically illustrates the first embodiment of the treatment station 3 having the treatment tank 4 and the common collection means 5 separated from the treatment tank 4, the treatment tank 4 having its spray section 13 and its immersion section 14 to treat the steel strip 1 with a common treatment liquid circulating between - and within - the common collection means 5 on the one hand, and the spray and immersion sections 13, 14 on the other hand.
  • Figure 3 schematically illustrates a treatment station 3 not belonging to this invention having the treatment tank 4 and the common collection means 5 separated from the treatment tank 4, the treatment tank 4 having its spray section 13 and its immersion section 14 to treat the steel strip 1 with a common treatment liquid circulating between - and within - the common collection means 5 on the one hand, and the spray and immersion sections 13 on the other hand.
  • Figures 1 and 2 combined illustrate the inventive treatment process and system (or treatment station) for chemical or electrochemical treatment of the surface of the steel strip 1, the steel strip 1 being a carbon steel strip.
  • the steel strip 1 is first horizontally transported through the treatment stations 3, 31, 32 in which the steel strip 1 is treated with a treatment liquid in the form of a pickling acid, normally containing HCI.
  • At least one of the treatment stations 3, 31, 32 (or their respective treatment tanks 4, 41, 42) comprises a spray pickling section (as represented in Figures 2 and 3 as spray section 13 of the treatment station 3) and a dip pickling section (as represented in Figures 2 and 3 as immersion section 14 of the treatment station 3) according to the present invention.
  • Figure 1 shows an exemplary implementation with three treatment station 3, 31, 32 (each having a treatment tank) as a preferred embodiment, however the number of treatment stations (and treatment tanks) is at least one and is not limited to three.
  • All treatment stations 3, 31, 32 comprise a common collection means, respectively (i.e. the respective treatment tanks 4, 41, 42 are connected to respective common collection means (or circulation tanks) 5, 51, 52), wherein the common collection means 5, 51, 52 are (i.e. potentially for each treatment station 3, 31, 32 differently) realized as separate tanks as shown in the first embodiment represented in Figure 2 .
  • the common collection means (or circulation tanks) 5, 51, 52 are operated as a cascade, i.e. the fresh or regenerated acid (i.e. the treatment liquid) is added (cf. reference sign 54) to the last common collection means (or last circulation tank) 52 - i.e. being related to the most downstream treatment station 32 according to the transport direction 2 of the steel strip 1 - and is consequently transferred to the other common collection means (or circulation tanks) in counter direction to the strip transport direction 2.
  • the level of free acid is the highest in the third treatment liquid (circulating in the third treatment station 32), the level of free acid is medium in the further treatment liquid (second treatment liquid) (circulating in the further (second) treatment station 31), and lowest in the treatment liquid (first treatment liquid) (circulating in the (first) treatment station 3.
  • the spent acid is removed (reference sign 55) from the (first) common collection means (or (first) circulation tank) 5.
  • the steel strip 1 is further processed in section 6 which comprises a rinse section and a dryer, if required.
  • the treatment station 3 comprises the treatment tank 4 with a separate common collection means 5 (or separate circulation tank 5).
  • wringer rolls 12 are installed to remove pickling acid from the strip and to guide the steel strip 1 inside the treatment tank 4.
  • the wringer roll 12 in the entry section is only used when the treatment tank is the first tank in the pickling process like the treatment station 3 in Figure 1 .
  • the following treatment stations (or treatment tanks), like treatment stations 31, 32 in Figure 1 do not need such wringer roll 12.
  • Figure 2 i.e.
  • the first part (according to the transport direction of the steel strip 1) of the treatment tank 4 is a spray pickling section 13 or spray section 13, followed by a dip pickling section 14 or immersion section 14.
  • spray nozzles 15 are mounted above and below the surface of the steel strip 1.
  • the pickling acid (or treatment liquid) is pumped from the circulation tank 5 (or common collection means 5) by means of pumps 17, 18 to both the spray pickling section 13 and the dip pickling section 14.
  • a heat exchanger 19 is installed to heat the pickling acid (treatment liquid) to the required temperature.
  • a guide roll 20 can be installed between the spray pickling section13 and the dip pickling section 14 in order to reduce the slack of the strip.
  • a common collection means (or circulation tank) wherein the treatment station 3 comprises the treatment tank 4 with an integrated common collection means 5.
  • the other components of the treatment station 3 are analogous to the description of Figure 2 .
  • the pickling line is configured for a maximum width of the steel strip 1 of 1890 mm, a maximum speed of the steel strip 1 of 255 m/min.
  • the distance of the spray nozzles 15 to the steel strip 1 (both from the spray nozzles to the top surface 1' of the steel strip 1, and to the bottom surface 1" of the steel strip 1) is 200 mm or approximately 200 mm.
  • the distance of the spray nozzles 15 to each other in the lateral direction of the steel strip 1 corresponds to 200 mm or approximately 200 mm.
  • the distance of the spray nozzles 15 to each other in the longitudinal direction of the steel strip 1 corresponds to 500 mm or approximately 500 mm.
  • the treatment liquid is preferably pumped out of the spray nozzles having a pressure of between and including 1 bar to and including 3 bar, and the amount of treatment liquid per spray nozzle is preferably 12 l/min or approximately 12 l/min.
  • the total number of spray nozzles per treatment station corresponds to 306 or approximately 306, and the amount of pumped treatment liquid per treatment station corresponds to 220 m3/h or approximately 220 m3/h.
  • Test trials were carried out in a pilot plant.
  • the pilot plant consisted of two treatment stations (each having a treatment tank) both arranged as described in the present invention with a first spray pickling section followed by a dip pickling section in each of the treatment tanks.
  • the treatment tanks were designed so that the length of both sections was approximately the same.
  • the pickling acid used was HCI with a concentration of approx. 200 g/l total acid in both tanks.
  • the material treated during the test runs were different IF steel grades (interstitial Free steel), which belong to the group of steel grades that are more difficult to pickle mainly due to their high recoiling temperature.

Claims (12)

  1. System zum Behandeln eines Stahlbands (1), insbesondere für eine Abbeizbehandlung des Stahlbands, mittels einer Behandlungsflüssigkeit in einer Behandlungsstation (3), wobei das System die Behandlungsstation (3) umfasst, wobei die Behandlungsstation (3) einen Behandlungsbehälter (4) mit einem Sprühbereich (13), einem Eintauchbereich (14) und der Behandlungsstation (3), die eine allgemeine Sammeleinrichtung (5) für die Behandlungsflüssigkeit umfasst, wobei die allgemeine Sammeleinrichtung (5) für die Behandlungsflüssigkeit sowohl des Sprühbereichs (13) als auch des Eintauchbereichs (14) eine Sammeleinrichtung (5) ist, die von dem Behandlungsbehälter (4) der Behandlungsstation (3) getrennt ist, wobei das Stahlband (1) aus Kohlenstoffstahl besteht und ein fortlaufendes Stahlband (1) ist, das sowohl in seiner Längs- als auch seiner Querrichtung im Wesentlichen horizontal ausgerichtet ist,
    wobei das Stahlband (1) eine obere Fläche (1') und eine untere Fläche (1") aufweist,
    wobei das System ausgelegt ist, um das Stahlband (1) fortlaufend durch die Behandlungsstation (3) in einer Transportrichtung zu transportieren, wobei die Transportrichtung derart parallel zur Längsrichtung des Stahlbands (1) ist, dass
    -- die Behandlungsflüssigkeit auf die obere Fläche (1') des Stahlbands (1) und auf die untere Fläche (1") des Stahlbands (1) gesprüht wird, während das Stahlband (1) in dem Sprühbereich (13) der Behandlungsstation (3) ist,
    -- das Stahlband (1) in die Behandlungsflüssigkeit eingetaucht wird, während das Stahlband (1) in dem Eintauchbereich (14) der Behandlungsstation (3) ist,
    wobei das System derart ausgelegt ist, dass die Behandlungsflüssigkeit fortlaufend aus der allgemeinen Sammeleinrichtung (5) und durch sowohl den Sprühbereich (13) als auch den Eintauchbereich (14) der Behandlungsstation (3) gepumpt wird, wobei das System Sprühdüsen (15) umfasst, derart, dass die Behandlungsflüssigkeit auf die obere und die untere Fläche (1', 1") des Stahlbands (1) unter Verwendung der Sprühdüsen (15) gesprüht wird.
  2. System nach Anspruch 1, wobei der Sprühbereich (13) eine effektive Sprühlänge umfasst, die derart parallel zur Längsrichtung des Stahlbands (1) verläuft, dass die obere und die untere Fläche (1', 1") des Stahlbands (1) die Behandlungsflüssigkeit aufnehmen, während sie innerhalb der effektiven Sprühlänge angeordnet sind, wobei der Eintauchbereich (14) eine effektive Eintauchlänge umfasst, die derart parallel zur Längsrichtung des Stahlbands (1) verläuft, dass das Stahlband (1) - mit seiner oberen und seiner unteren Fläche (1', 1") - in die Behandlungsflüssigkeit eingetaucht wird, während es innerhalb der effektiven Eintauchlänge angeordnet ist, wobei die effektive Sprühlänge und die effektive Eintauchlänge mit einem Verhältnis von zwischen und einschließlich 30:70 bis 70:30, insbesondere einem Verhältnis von 50:50, versehen sind.
  3. System nach einem der Ansprüche 1 bis 2, wobei der Sprühbereich (14) - entlang der Transportrichtung des Stahlbands (1) - in Bezug auf den Eintauchbereich (15) stromaufwärts oder stromabwärts angeordnet ist.
  4. System nach einem der Ansprüche 1 bis 3, wobei das System - neben der Behandlungsflüssigkeit in der Behandlungsstation (3) - eine weitere Behandlungsflüssigkeit in einer weiteren Behandlungsstation (31) umfasst, wobei die weitere Behandlungsstation (31) einen weiteren Behandlungsbehälter (41) mit einem weiteren Sprühbereich und einem weiteren Eintauchbereich umfasst, und wobei die weitere Behandlungsstation (31) eine weitere allgemeine Sammeleinrichtung (51) für die weitere Behandlungsflüssigkeit umfasst,
    wobei das System derart ausgelegt ist, dass das Stahlband (1) fortlaufend durch die weitere Behandlungsstation (31) derart in der Transportrichtung transportiert wird, dass
    -- die weitere Behandlungsflüssigkeit auf die obere Fläche (1') des Stahlbands (1) und auf die untere Fläche (1") des Stahlbands (1) gesprüht wird, während das Stahlband (1) in dem weiteren Sprühbereich der weiteren Behandlungsstation (31) ist,
    -- das Stahlband (1) in die weitere Behandlungsflüssigkeit eingetaucht wird, während das Stahlband (1) in dem weiteren Eintauchbereich der weiteren Behandlungsstation (31) ist,
    wobei das System derart ausgelegt ist, dass die weitere Behandlungsflüssigkeit fortlaufend aus der weiteren allgemeinen Sammeleinrichtung (51) und durch sowohl den weiteren Sprühbereich als auch den weiteren Eintauchbereich der weiteren Behandlungsstation (31) gepumpt wird,
    wobei das System weitere Sprühdüsen umfasst, derart, dass die weitere Behandlungsflüssigkeit auf die obere und die untere Fläche (1', 1") des Stahlbands (1) unter Verwendung der weiteren Sprühdüsen gesprüht wird.
  5. System nach einem der Ansprüche 1 bis 4, wobei das System - neben der Behandlungsflüssigkeit in der Behandlungsstation (3) und der weiteren Behandlungsflüssigkeit in der weiteren Behandlungsstation (31) - eine dritte Behandlungsflüssigkeit in einer dritten Behandlungsstation (32) umfasst, wobei die dritte Behandlungsstation (32) einen dritten Behandlungsbehälter (42) mit einem dritten Sprühbereich und einem dritten Eintauchbereich umfasst, und die dritte Behandlungsstation (32) eine dritte allgemeine Sammeleinrichtung (52) für die dritte Behandlungsflüssigkeit umfasst.
  6. System nach einem der Ansprüche 1 bis 5, wobei die Behandlungsflüssigkeit und/oder die weitere Behandlungsflüssigkeit und/oder die dritte Behandlungsflüssigkeit
    -- Salzsäure in einer Konzentration im Bereich von und einschließlich 150 g/l bis und einschließlich 250 g/l und
    -- FeCl3 in einer Konzentration im Bereich von und einschließlich 10 g/l bis und einschließlich 35 g/l, insbesondere in einer Konzentration im Bereich von und einschließlich 15 g/l bis und einschließlich 30 g/l oder insbesondere in einer Konzentration im Bereich von und einschließlich 19 g/l bis und einschließlich 26 g/l, und
    -- FeCl2 in einer Konzentration im Bereich von und einschließlich 30 g/l bis und einschließlich 300 g/l, insbesondere in einer Konzentration im Bereich von und einschließlich 30 g/l bis und einschließlich 60 g/l oder in einer Konzentration im Bereich von und einschließlich 130 g/l bis und einschließlich 180 g/l oder in einer Konzentration im Bereich von und einschließlich 230 g/l bis und einschließlich 300 g/l,
    umfasst.
  7. Verfahren zum Behandeln eines Stahlbands (1), insbesondere für eine Abbeizbehandlung des Stahlbands (1), mittels einer Behandlungsflüssigkeit in einer Behandlungsstation (3), wobei die Behandlungsstation (3) einen Behandlungsbehälter (4) mit einem Sprühbereich (13) und einem Eintauchbereich (14) umfasst, und die Behandlungsstation (3) eine allgemeine Sammeleinrichtung (5) für die Behandlungsflüssigkeit umfasst, wobei die allgemeine Sammeleinrichtung (5) für die Behandlungsflüssigkeit sowohl des Sprühbereichs (13) als auch des Eintauchbereichs (14) eine Sammeleinrichtung (5) ist, die von dem Behandlungsbehälter (4) der Behandlungsstation (3) getrennt ist, wobei das Stahlband (1) aus Kohlenstoffstahl besteht und ein fortlaufendes Stahlband (1) ist, das sowohl in seiner Längs- als auch seiner Querrichtung im Wesentlichen horizontal ausgerichtet ist,
    wobei das Stahlband (1) eine obere Fläche (1') und eine untere Fläche (1") aufweist,
    wobei das Verfahren das fortlaufende Transportieren des Stahlbands (1) durch die Behandlungsstation (3) in einer Transportrichtung (2) umfasst, wobei die Transportrichtung derart parallel zur Längsrichtung des Stahlbands (1) ist, dass
    -- in einem ersten Schritt die Behandlungsflüssigkeit auf die obere Fläche (1') des Stahlbands (1) und auf die untere Fläche (1") des Stahlbands (1) gesprüht wird, während das Stahlband (1) in dem Sprühbereich (13) der Behandlungsstation (3) ist,
    -- in einem zweiten Schritt das Stahlband (1) in die Behandlungsflüssigkeit eingetaucht wird, während das Stahlband (1) in dem Eintauchbereich (14) der Behandlungsstation (3) ist,
    wobei beim Behandeln des Stahlbands (1) die Behandlungsflüssigkeit fortlaufend aus der allgemeinen Sammeleinrichtung (5) und durch sowohl den Sprühbereich (13) als auch den Eintauchbereich (14) der Behandlungsstation (3) gepumpt wird, wobei das Sprühen der Behandlungsflüssigkeit auf die obere und die untere Fläche (1', 1") des Stahlbands (1) unter Verwendung der Sprühdüsen (15) bereitgestellt wird.
  8. Verfahren nach Anspruch 7, wobei der Sprühbereich (13) eine effektive Sprühlänge umfasst, die derart parallel zur Längsrichtung des Stahlbands (1) verläuft, dass - während des ersten Schritts - die obere und die untere Fläche (1', 1") des Stahlbands (1) die Behandlungsflüssigkeit aufnehmen, während sie innerhalb der effektiven Sprühlänge angeordnet sind, wobei der Eintauchbereich (14) eine effektive Eintauchlänge umfasst, die derart parallel zur Längsrichtung des Stahlbands (1) verläuft, dass - während des zweiten Schritts - das Stahlband (1) - mit seiner oberen und seiner unteren Fläche (1', 1") - in die Behandlungsflüssigkeit eingetaucht wird, während es innerhalb der effektiven Eintauchlänge angeordnet ist, wobei die effektive Sprühlänge und die effektive Eintauchlänge mit einem Verhältnis von zwischen und einschließlich 30:70 bis 70:30, insbesondere einem Verhältnis von 50:50, versehen sind.
  9. Verfahren nach einem der Ansprüche 7 bis 8, wobei die effektive Sprühlänge und daher das Verhältnis der effektiven Sprühlänge gegenüber der effektiven Eintauchlänge variiert wird, indem nur ein Teil der Sprühdüsen (15) aktiviert wird.
  10. Verfahren nach einem der Ansprüche 7 bis 9, wobei der Sprühbereich (14) - entlang der Transportrichtung des Stahlbands (1) - in Bezug auf den Eintauchbereich (15) stromaufwärts oder stromabwärts angeordnet ist.
  11. Verfahren nach einem der Ansprüche 7 bis 10, wobei das Verfahren - neben dem Verwenden der Behandlungsflüssigkeit in der Behandlungsstation (3) - das Verwenden einer weiteren Behandlungsflüssigkeit in einer weiteren Behandlungsstation (31) umfasst, wobei die weitere Behandlungsstation (31) einen weiteren Behandlungsbehälter (41) mit einem weiteren Sprühbereich und einem weiteren Eintauchbereich umfasst, und wobei die weitere Behandlungsstation (31) eine weitere allgemeine Sammeleinrichtung (51) für die weitere Behandlungsflüssigkeit umfasst,
    wobei das Verfahren das fortlaufende Transportieren des Stahlbands (1) durch die weitere Behandlungsstation (31) in der Transportrichtung umfasst, derart, dass
    -- in einem dritten Schritt die weitere Behandlungsflüssigkeit auf die obere Fläche (1') des Stahlbands (1) und auf die untere Fläche (1") des Stahlbands (1) gesprüht wird, während das Stahlband (1) in dem weiteren Sprühbereich der weiteren Behandlungsstation (31) ist,
    - in einem vierten Schritt das Stahlband (1) in die weitere Behandlungsflüssigkeit eingetaucht wird, während das Stahlband (1) in dem weiteren Eintauchbereich der weiteren Behandlungsstation (31) ist,
    wobei während des Behandelns des Stahlbands (1) die weitere Behandlungsflüssigkeit fortlaufend aus der weiteren allgemeinen Sammeleinrichtung (51) und durch sowohl den weiteren Sprühbereich als auch den weiteren Eintauchbereich der weiteren Behandlungsstation (31) gepumpt wird,
    wobei das Sprühen der weiteren Behandlungsflüssigkeit auf die obere und die untere Fläche (1', 1") des Stahlbands (1) unter Verwendung der weiteren Sprühdüsen bereitgestellt wird, wobei der dritte und der vierte Schritt dem ersten und dem zweiten Schritt vorangehen oder dem ersten und dem zweiten Schritt folgen.
  12. Verfahren nach einem der Ansprüche 7 bis 11, wobei die Behandlungsflüssigkeit und/oder die weitere Behandlungsflüssigkeit
    -- Salzsäure in einer Konzentration im Bereich von und einschließlich 150 g/l bis und einschließlich 250 g/l und
    -- FeCl3 in einer Konzentration im Bereich von und einschließlich 10 g/l bis und einschließlich 35 g/l, insbesondere in einer Konzentration im Bereich von und einschließlich 15 g/l bis und einschließlich 30 g/l oder insbesondere in einer Konzentration im Bereich von und einschließlich 19 g/l bis und einschließlich 26 g/l, und
    -- FeCl2 in einer Konzentration im Bereich von und einschließlich 30 g/l bis und einschließlich 300 g/l, insbesondere in einer Konzentration im Bereich von und einschließlich 30 g/l bis und einschließlich 60 g/l oder in einer Konzentration im Bereich von und einschließlich 130 g/l bis und einschließlich 180 g/l oder in einer Konzentration im Bereich von und einschließlich 230 g/l bis und einschließlich 300 g/l,
    umfasst.
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ES14195949T ES2742827T3 (es) 2014-12-02 2014-12-02 Método y sistema de tratamiento de una banda de acero al carbono, especialmente para el decapado
BR112017011358A BR112017011358A2 (pt) 2014-12-02 2015-12-02 método e sistema de tratamento de uma tira de aço de carbono, especialmente para um tratamento de decapagem
MX2017007112A MX2017007112A (es) 2014-12-02 2015-12-02 Metodo y sistema de tratamiento de fleje de acero al carbono, especialmente para tratamiento de decapado.
CN201580065566.5A CN107002254A (zh) 2014-12-02 2015-12-02 处理碳钢带，特别是用于酸洗处理的方法和系统
JP2017528780A JP2018502985A (ja) 2014-12-02 2015-12-02 炭素鋼帯を処理する、特に酸洗処理のための方法及びシステム
PCT/EP2015/078311 WO2016087493A1 (en) 2014-12-02 2015-12-02 Method and system of treating a carbon steel strip, especially for a pickling treatment
US15/532,121 US20170268113A1 (en) 2014-12-02 2015-12-02 Method and system of treating a carbon steel strip, especially for a pickling treatment
RU2017123254A RU2691688C2 (ru) 2014-12-02 2015-12-02 Способ и система для обработки полосы из углеродистой стали, прежде всего для травления
CA2969369A CA2969369A1 (en) 2014-12-02 2015-12-02 Method and system of treating a carbon steel strip, especially for a pickling treatment
KR1020177018058A KR20170088433A (ko) 2014-12-02 2015-12-02 탄소강 스트립의 처리, 특히 피클링 처리를 위한 방법 및 시스템
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EP3227466A1 (de) 2017-10-11
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RU2017123254A (ru) 2019-01-09
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CA2969369A1 (en) 2016-06-09
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