EP3227466A1 - Procédé et système permettant un traitement d'une bande d'acier au carbone, en particulier un traitement de décapage - Google Patents

Procédé et système permettant un traitement d'une bande d'acier au carbone, en particulier un traitement de décapage

Info

Publication number
EP3227466A1
EP3227466A1 EP15804431.3A EP15804431A EP3227466A1 EP 3227466 A1 EP3227466 A1 EP 3227466A1 EP 15804431 A EP15804431 A EP 15804431A EP 3227466 A1 EP3227466 A1 EP 3227466A1
Authority
EP
European Patent Office
Prior art keywords
steel strip
treatment
treatment liquid
section
spray
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.)
Withdrawn
Application number
EP15804431.3A
Other languages
German (de)
English (en)
Inventor
Thomas Marx
Wolfgang WALSDORF
Rafael Rituper
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.)
John Cockerill UVK GmbH
Original Assignee
CMI UVK 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=51999367&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP3227466(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by CMI UVK GmbH filed Critical CMI UVK GmbH
Publication of EP3227466A1 publication Critical patent/EP3227466A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • 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
    • 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

  • the present invention relates to a method for treating a steel strip, especially for a pickling treatment of the steel strip, by means of a treatment liquid in a treatment station, the treatment station comprising a treatment tank.
  • the present invention relates to a system for treating a steel strip, especially for a pickling treatment of the steel strip, by means of a treatment liquid in a treatment station, the treatment station comprising a treatment tank.
  • the steel strip to be treated according to the method of the present invention and in a system of the present invention is a carbon steel.
  • 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.
  • 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.
  • HCI replaced H 2 S0 4 due to shorter pickling time, lower consumption and the possibility of total regeneration of the acid.
  • Pickling acids are consumed during the pickling process.
  • the acid dissolves the oxide scale and metal salts are formed.
  • H 2 S0 4 mainly forms FeS0 4 which can be removed from the pickling liquid and has to be disposed and consequently has to be replaced by fresh H 2 S0 4 .
  • HCI on the contrary forms mainly FeCI 2 and a minor amount of FeCI 3 during the pickling process. Both can be converted back to HCL in the so called pyrohydrolysis reaction using fluidized bed or spray roaster regeneration plants resulting in a complete recovery of the spent pickling acid.
  • HCI acts less aggressive to the base metal than H 2 S0 4 and consequently reducing the risk of over-pickling.
  • 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.
  • the last treatment tank i.e. the most downstream treatment tank according to the direction of movement of the steel strip
  • 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. [0013] Inside the treatment tank, 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.
  • 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, cf. e.g. document DE 42 28 808 A1 .
  • 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.
  • FeCI 3 aggressiveness with regards to the base metal is the formation of FeCI 3 in the pickling acid.
  • the spray nozzles used in the spray pickling technology create fine droplets with a high surface which are in direct contact with air.
  • the air in particular the oxygen contained in the air, dissolves in the pickling acid and oxidizes the FeCI 2 together with the HCI forming FeCI 3 .
  • HCI is a non oxidizing acid and therefore dissolving the base metal only slowly
  • FeCI 3 is an oxidizing agent, consequently increasing the dissolving speed of the base material.
  • the FeCI 3 concentration can reach 60 g/l and above.
  • Another drawback of the increased FeCI 3 concentration in the pickling acid is the effect on the regeneration process of the spent pickling acid.
  • Spent pickling acid is typically
  • FeCI 2 and FeCI 3 are converted back to HCI and Fe 2 0 3 .
  • FeCI 3 however has a much lower evaporation temperature than FeCI 2 and evaporates in the pyrohydrolysis reactor causing very fine Fe 2 0 3 particles below 1 ⁇ in size when converted to Fe 2 0 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 for treating a steel strip, especially for a pickling treatment of the steel strip, by means of a treatment liquid in a treatment station, the treatment station comprising a treatment tank with a spray section and an immersion section, and the treatment station comprising a common collection means for the treatment liquid,
  • steel strip comprises carbon steel and is a continuous steel strip being oriented substantially horizontally, both in its longitudinal and transverse directions,
  • the steel strip has a top surface and a bottom surface
  • the method comprises transporting the steel strip continuously through the treatment station in a transport direction, the transport direction being parallel to the longitudinal direction of the steel strip, such that
  • the treatment liquid is sprayed onto the top surface of the steel strip and onto the bottom surface of the steel strip while the steel strip being in the spray section of the treatment station,
  • the steel strip is immersed in the treatment liquid while the steel strip being in the immersion section of the treatment station,
  • the treatment liquid is continuously pumped out of the common collection means and through both the spray section and the immersion section of the treatment station, wherein spraying of the treatment liquid onto the top and bottom surfaces of the steel strip is provided using spray nozzles.
  • 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 steel strip instead of the steel strip comprising carbon steel, it is also preferred that the steel strip consists of carbon steel.
  • 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 FeCI 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.
  • each single treatment tank (of the treatment station) of the above described process comprises of one spray pickling zone and one dip pickling zone arranged as one unit using one common circulation circuit, i.e. one common circulation tank (common collection means) with several pump circuits as required. All pickling acid coming from the dip section and the spray section are collected and mixed in the common circulation tank (common collection means) and pumped back to the above mentioned two pickling sections (of the treatment tank of the treatment station).
  • a guide roll underneath the strip located between the spray and pickling section might be required to better position the steel strip inside the treatment tank.
  • a wringer roll unit - as it is typically installed between two pickling sections - is not required.
  • the first section of the treatment tank is a spray section while the second section of the dip pickling type, preferably with high efficiency such as shallow tank turbulence technology.
  • the steel strip is treated - in the treatment tank of the treatment station - by means of a treatment liquid such that the same treatment liquid is used both in the spray section and in the immersion section of the treatment tank.
  • a treatment liquid such that the same treatment liquid is used both in the spray section and in the immersion section of the treatment tank.
  • the steel strip comprises carbon steel and 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.
  • the treatment liquid is sprayed - in a first step and by means of nozzles - onto the top surface of the steel strip and onto the bottom surface of the steel strip while the steel strip is in the spray section of the treatment station.
  • second step that is not necessarily subsequent to the first step but could also be preceding the first step
  • the steel strip is immersed in the treatment liquid while the steel strip is in the immersion section of the treatment station.
  • the treatment liquid of the treatment station is continuously pumped out of the common collection means (of that treatment station) and through both the spray section and the immersion section of the treatment tank, wherein spraying of the treatment liquid onto the top and bottom surfaces of the steel strip is provided using spray nozzles.
  • 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 FeCI 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 FeCI 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 FeCI 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 design of the present invention also allows the possibility to operate the treatment tanks without an additional (external) circulation tank - or common collection means - (i.e. external or separate to the treatment tank).
  • the treatment tank itself in particular the area underneath the spray section, and, if required, also underneath the dip section, is used as circulation tank (or common collection means), i.e. the circulation tank (or common collection means) is realized in a manner integrated with the treatment tank.
  • circulation tank or common collection means
  • the circulation tank or common collection means
  • 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,
  • the method comprises transporting the steel strip continuously through the further treatment station in the transport direction such that
  • the further treatment liquid is sprayed onto the top surface of the steel strip and onto the bottom surface of the steel strip while the steel strip being in the further spray section of the further treatment station,
  • the steel strip is immersed in the further treatment liquid while the steel strip being in the further immersion section of the further treatment station,
  • the further treatment liquid is continuously pumped out of the further common collection means and through both the further spray section and the further immersion section of the further treatment station , wherein spraying of the further treatment liquid onto the top and bottom surfaces of the steel strip is provided using further spray nozzles, wherein the third and fourth steps are preceding the first and second steps or are subsequent to the first and second steps.
  • 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
  • hydrochloric acid in a concentration ranging from and including 150 g/l to and including 250 g/l and
  • FeCI 3 in a concentration ranging from and including 10 g/l to and including 35 g/l, especially in a concentration ranging from and including 15 g/l to and including 30 g/l or especially in a concentration ranging from and including 19 g/l to and including 26 g/l and,
  • FeCI 2 + ions in a concentration ranging from and including 30 g/l to and including 300 g/l, especially in a concentration ranging from and including 30 g/l to and including 60 g/l or in a concentration ranging from and including 130 g/l to and including 180 g/l or in a
  • the present invention also relates to a system for treating a steel strip, especially for a pickling treatment of the steel strip, by means of a treatment liquid in a treatment station, the system comprising the treatment station, wherein the treatment station comprises a treatment tank with a spray section, an immersion section, and the treatment station comprising a common collection means for the treatment liquid,
  • steel strip comprises carbon steel and is a continuous steel strip being oriented substantially horizontally, both in its longitudinal and transverse directions,
  • the steel strip has a top surface and a bottom surface
  • system is configured to transport the steel strip continuously through the treatment station in a transport direction, the transport direction being parallel to the longitudinal direction of the steel strip, such that
  • the treatment liquid is sprayed onto the top surface of the steel strip and onto the bottom surface of the steel strip while the steel strip being in the spray section of the treatment station,
  • the steel strip is immersed in the treatment liquid while the steel strip being in the immersion section of the treatment station,
  • system is configured such that the treatment liquid is continuously pumped out of the common collection means and through both the spray section and the immersion section of the treatment station, wherein the system comprises spray nozzles such that the treatment liquid is sprayed onto the top and bottom surfaces of the steel strip using the spray nozzles.
  • 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 FeCI 3 concentration in such spent acid.
  • the steel strip instead of the steel strip comprising carbon steel, it is also preferred that the steel strip consists of carbon steel.
  • 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 common collection means for the treatment liquid of both the spray section and the immersion section is a collection means separated from the treatment tank of the treatment station.
  • the present invention it is thereby advantageously possible to build 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 common collection means for the treatment liquid of both the spray section and the immersion section is a collection means integrated with the treatment tank of the treatment station, especially integrated such that the bottom part of the treatment tank forms the common collection means.
  • 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.
  • 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,
  • system is configured such that the steel strip is transported continuously through the further treatment station in the transport direction such that
  • the further treatment liquid is sprayed onto the top surface of the steel strip and onto the bottom surface of the steel strip while the steel strip being in the further spray section of the further treatment station,
  • 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
  • hydrochloric acid in a concentration ranging from and including 150 g/l to and including 250 g/l and — FeCI 3 in a concentration ranging from and including 10 g/l to and including 35 g/l, especially in a concentration ranging from and including 15 g/l to and including 30 g/l or especially in a concentration ranging from and including 19 g/l to and including 26 g/l and,
  • Figure 1 schematically illustrates a treatment system comprising three different treatment stations, each one being configured 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.
  • Figure 2 schematically illustrates a first embodiment of a treatment station having a treatment tank and a common collection means separated from the treatment tank, the treatment tank having its spray section and its immersion section to treat the steel strip with a common treatment liquid circulating between - and within - the common collection means on the one hand, and the spray and immersion sections on the other hand.
  • 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 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
  • the following treatment stations do not need such wringer roll 12.
  • 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
  • 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.
  • 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.
  • 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.
  • the test results have proven that the pickling time could be reduced by 40 - 45% compared to the conventional pickling process using dip pickling with shallow tank turbulence technology, while the FeCI3 concentration was constantly below 30 g/l which is considered to be uncritical as far as the acid regeneration process is concerned. All tested materials showed uniform pickling results without any signs of over-pickling.
  • the concentration of HCI is in the range of between and comprising 205 g/l to and comprising 220 g/l
  • the concentration of FeCI2 is in the range of between and comprising 260 g/l to and comprising 278 g/l
  • the concentration of FeCI3 is in the range of between and comprising 22 g/l to and comprising 26 g/l.
  • the temperature of the treatment liquid is in the range of between and comprising 88 °C to and comprising 91 °C.
  • the concentration of HCI is in the range of between and comprising 201 g/l to and comprising 21 1 g/l
  • the concentration of FeCI2 is in the range of between and comprising 140 g/l to and comprising 146 g/l
  • the concentration of FeCI3 is in the range of between and comprising 21 g/l to and comprising 26 g/l.
  • the temperature of the treatment liquid is in the range of between and comprising 88 °C to and comprising 91 °C.

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

Abstract

La présente invention concerne un procédé de traitement d'une bande d'acier à l'aide d'un liquide de traitement dans une station de traitement. La station de traitement comprend au moins une section de pulvérisation, une section d'immersion et un moyen de collecte commun destiné au liquide de traitement. La bande d'acier est constituée d'acier au carbone. Il s'agit d'une bande d'acier continue orientée sensiblement horizontalement à la fois dans les directions longitudinale et transversale. La bande d'acier a une surface supérieure et une surface inférieure. Le procédé suppose de transporter en continu la bande d'acier à travers la station de traitement dans une direction de transport. La direction de transport est parallèle à la direction longitudinale de la bande d'acier. Au cours d'une première étape, le liquide de traitement est pulvérisé sur les surfaces supérieure et inférieure de la bande d'acier lorsque cette dernière se trouve dans la section de pulvérisation de la station de traitement. Au cours d'une seconde étape, la bande d'acier est immergée dans le liquide de traitement lorsqu'elle se trouve dans la section d'immersion de la station de traitement. Lors du traitement de la bande d'acier, le liquide de traitement est continuellement pompé hors du moyen de collecte commun et à travers la section de pulvérisation et la section d'immersion de la station de traitement. La pulvérisation du liquide de traitement sur les surfaces supérieure et inférieure de la bande d'acier est effectuée à l'aide de buses de pulvérisation.
EP15804431.3A 2014-12-02 2015-12-02 Procédé et système permettant un traitement d'une bande d'acier au carbone, en particulier un traitement de décapage Withdrawn EP3227466A1 (fr)

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Application Number Priority Date Filing Date Title
EP14195949.4A EP3029163B9 (fr) 2014-12-02 2014-12-02 Procédé et système de traitement d'une bande d'acier au carbone, notamment pour un traitement de décapage
PCT/EP2015/078311 WO2016087493A1 (fr) 2014-12-02 2015-12-02 Procédé et système permettant un traitement d'une bande d'acier au carbone, en particulier un traitement de décapage

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EP3227466A1 true EP3227466A1 (fr) 2017-10-11

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EP15804431.3A Withdrawn EP3227466A1 (fr) 2014-12-02 2015-12-02 Procédé et système permettant un traitement d'une bande d'acier au carbone, en particulier un traitement de décapage

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US (1) US20170268113A1 (fr)
EP (2) EP3029163B9 (fr)
JP (1) JP2018502985A (fr)
KR (1) KR20170088433A (fr)
CN (1) CN107002254A (fr)
BR (1) BR112017011358A2 (fr)
CA (1) CA2969369A1 (fr)
ES (1) ES2742827T3 (fr)
MX (1) MX2017007112A (fr)
RU (1) RU2691688C2 (fr)
WO (1) WO2016087493A1 (fr)

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CN107499199A (zh) * 2017-08-20 2017-12-22 芜湖乐普汽车科技有限公司 一种儿童汽车座椅的头靠组件的制造工艺
DE102018117475A1 (de) * 2018-07-19 2020-01-23 Sms Group Gmbh Beizanlage zur Oberflächenbehandlung von Bandstahl
KR102088287B1 (ko) * 2019-12-19 2020-03-12 주식회사 디케이씨 수직형 연속 산세 설비
KR20220072983A (ko) 2020-11-26 2022-06-03 한동희 리튬이온 이차전지용 음극 복합체, 그의 제조방법, 그를 포함하는 리튬이온 이차전지
CN115261877B (zh) * 2022-08-29 2023-12-08 粤海中粤(中山)马口铁工业有限公司 一种连续式酸洗机组消除带钢酸洗停车斑的装置及方法

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Also Published As

Publication number Publication date
JP2018502985A (ja) 2018-02-01
US20170268113A1 (en) 2017-09-21
CN107002254A (zh) 2017-08-01
EP3029163A1 (fr) 2016-06-08
EP3029163B1 (fr) 2019-05-22
RU2691688C2 (ru) 2019-06-17
WO2016087493A1 (fr) 2016-06-09
CA2969369A1 (fr) 2016-06-09
ES2742827T3 (es) 2020-02-17
KR20170088433A (ko) 2017-08-01
RU2017123254A (ru) 2019-01-09
BR112017011358A2 (pt) 2018-04-03
MX2017007112A (es) 2017-08-18
EP3029163B9 (fr) 2019-11-27
RU2017123254A3 (fr) 2019-04-09

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