Method and device for on-line rusting and stabilizing of steel sheets in a limited space

Abstract

The application discloses a kind of limited space in steel plate on-line rusting and rust layer stabilization treatment method and equipment, utilize chemical method to complete the rusting treatment of steel plate on-line, make the even rust layer of steel plate surface, then spray rust layer fast stabilization reagent on the surface of steel plate, complete the fast stabilization process of steel plate rust layer on-line, finally realize the rusting and rust layer stabilization treatment of steel plate in limited space are completed.The application is saved by the special design of the limited space in steel plate on-line rusting and rust layer stabilization treatment equipment to space, can be completed to 100m / min walking speed of weathering steel plate in the range of 10-20m production line range continuous on-line processing.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of weathering steel surface treatment, and particularly relates to a method and equipment for on-line rusting and rust layer stabilization treatment of steel plates in a limited space. BACKGROUND

[0002] Compared with carbon steel, weathering steel has good atmospheric corrosion resistance, mainly because a stable and dense protective rust layer is formed on the surface of the weathering steel after long-term exposure to the atmosphere, which hinders the entry of corrosive media, while the rust layer formed on the surface of carbon steel is often loose and has a large number of microcracks, which has poor protection to the substrate.

[0003] Currently, in the natural environment, it takes 4 years or more for weathering steel to form a stable protective rust layer, and before the weathering steel forms a stable rust layer, it often appears phenomena such as uneven rust color, rust liquid dripping, rust slag flying, etc., which affect the surrounding environment and appearance. However, after 4 years or more, when the surface rust layer is stable, the weathering steel can show a deep brown or coffee color appearance with strong thickness, which has a strong retro art atmosphere and is loved by people; and the color does not change for many years, which can well hinder the further penetration of corrosive media and prevent corrosion.

[0004] The existing technology mainly focuses on the aspects of fast rusting and rust layer stabilization solution formula, for example: application No. 86103534 discloses a method for rapidly forming a weather-resistant rust film on steel, which is actually an optimization of the existing method in Japan, using tannin instead of the more expensive tannin acid. The patent document No. CN103173754A discloses a preparation method of a weathering steel surface rust layer stabilization treatment agent, which is composed of 25-45% alcohol acid varnish, 4-12% copper pyrophosphate, 2-10% barium chromate, 1-14% Fe3O4, 20-50% Fe2O3, 1-10% solvent oil and 0.5-5% dispersant. The above technical solution has obtained some small-scale applications in China, but it is often used for on-site treatment of processed weathering steel products, which has great limitations, as follows:

[0005] (1) The treatment time often needs at least 1 to 2 days, because complex pretreatment such as degreasing and cleaning is required before treatment, and multiple spraying of special chemicals and then water is required, which results in time-consuming and labor-intensive treatment process;

[0006] (2) The rusting effect has certain requirements for the technical level of the construction personnel, if the technical level of the construction personnel is not high enough, the rust color will be uneven and dripping, which affects the appearance;

[0007] (3) The above technology has certain requirements for the site environment during construction, and needs a special site to store samples. On-site construction of large buildings can easily pollute the surrounding environment, and special equipment is needed for construction.

[0008] In contrast, there are not many technologies for rusted products; for example: Chinese patent CN207512973U discloses a structure of a weather-resistant steel plate. The product involved in this patent document is a rusted weather-resistant steel product, but it must be coated on the basis of the rust plate. The patent document with publication number CN103459670A discloses a rusted steel material that is particularly excellent in corrosion resistance in a state without coating in a severe corrosion environment where the content of atmospheric salt mist is high, such as a coastal area. However, in the technical solution disclosed in this technology, the material does not have a stable rust layer from the beginning of service, but naturally generates a rust layer in the natural environment and gradually stabilizes. Therefore, the problems of uneven color, instability, and dripping yellow rust and rust slag before stabilization have not been solved.

[0009] In summary, there is no mature related rusted product at present because of the contradiction between the fast rusting time, production efficiency, and production line length. The existing fast rusting technology can at most compress the fast rusting time to 1 hour, as described in application number CN201810620156.8. However, even if the fast rusting treatment time is compressed to the limit of 30 minutes, it is difficult to realize continuous online processing of the product. According to the existing low-speed hot-rolled strip of 10 meters / minute, it takes a production line of up to 300 meters to complete the product processing. If the hot-rolled strip travels at a conventional speed of 45 meters / minute, the required production line length will be a staggering 1350 meters. Limited by the thickness specifications, conventional hot-rolled strips, especially those with a thickness of more than 6 mm, are often difficult to save space by adopting a vertical production line layout in the form of a looper. The main user of rusted weather-resistant steel plates is weather-resistant steel bridges, and the product specifications used are mainly medium-thick hot-rolled steel plates with a thickness of more than 6 mm. This means that to realize online processing of steel plates with rust for delivery, at least 300 meters of space is needed, which is almost impossible to achieve. Or it is necessary to slow down the speed to 1 meter / minute or even lower, which will seriously affect the production efficiency.

[0010] Therefore, a new manufacturing method and production equipment are expected, which can generate a uniform and stable rust layer on the surface of a weather-resistant steel plate in a limited space in batches and continuously, and solve the contradiction between the rusting time, production efficiency, and production line space. SUMMARY

[0011] In view of the above-mentioned defects in the prior art, the purpose of the present application is to provide a method and equipment for on-line rusting and rust layer stabilization treatment of steel plates in a limited space, which adopts a chemical treatment method to perform surface treatment on weather-resistant steel plates, and completes the rusting process which needs 3-6 months in a natural environment and the rust layer stabilization process which needs 4-8 years in a natural environment; the significant advantage of the method and equipment for on-line rusting and rust layer stabilization treatment of steel plates in a limited space is that the space is saved through special design of the on-line rusting and rust layer stabilization treatment equipment for steel plates in a limited space, and the continuous on-line treatment of weather-resistant steel plates with a walking speed of 100 m / min can be completed in a production line with a range of 10-20 m.

[0012] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0013] The first aspect of the present application provides a method for on-line rusting and rust layer stabilization treatment of steel plates in a limited space, characterized in that the rusting treatment of the steel plates is completed on-line by using a chemical method, a uniform rust layer is generated on the surface of the steel plates, then a rust layer fast stabilization reagent is sprayed on the surface of the steel plates, the fast stabilization process of the rust layer of the steel plates is completed on-line, and finally the rusting and rust layer stabilization treatment of the steel plates is completed in a limited space.

[0014] Preferably, the treatment method adopts an on-line rusting and rust layer stabilization treatment equipment for steel plates to perform treatment on the steel plates, and specifically includes the following steps:

[0015] S1, incoming material, after continuous strip steel is cut into steel plates with a uniform length, the steel plates are conveyed on-line to a fixed support of an incoming material area of the on-line rusting and rust layer stabilization treatment equipment for steel plates by a conveying roller, and the steel plates are fixed by the fixed support;

[0016] S2, side standing, the fixed support and the steel plates are lifted and rotated by 90° along a conveying track under the driving of a conveying mechanism, after the upper surface of the steel plates contacts a previous fixed support, the previous fixed support locks the steel plates, and the side standing operation of the steel plates is completed;

[0017] S3, oxidation and air drying, after the side standing operation is completed, the steel plates enter a treatment area, rusting agent is sprayed to the surface of the steel plates in a rusting agent spraying area of the treatment area, and after the steel plates are air dried, the oxidant in the rusting agent oxidizes the Fe atoms on the surface of the steel plates into Fe 2+ ions;

[0018] S4, wetting and air drying, after the steel plates treated in the step S3 enter a wetting and air drying area of the treatment area, water is repeatedly sprayed to the steel plates and compressed air is used to accelerate air drying, so that the rust layer is generated on the surface of the steel plates by rusting, and the surface of the steel plates becomes yellow or yellowish brown;

[0019] S5, stabilizing and air-drying, the steel plate treated by the step S4 enters the stabilizing and air-drying area of the treatment area, a rust layer stabilizing agent is sprayed on the surface of the steel plate and air-dried, the stabilization of the rust layer of the steel plate is completed, and the rust layer becomes brown or coffee color;

[0020] S6, drying, the steel plate treated by the step S5 is accelerated to evaporate the moisture in the steel plate and the rust layer by radiation heating or hot air baking;

[0021] S7, flattening, after the moisture in the steel plate and the rust layer is evaporated, the steel plate is released by the next fixed support, and the steel plate is slowly flattened with the previous fixed support under the driving of the conveying mechanism and is directly caught by the conveying roller;

[0022] S8, feeding, after the steel plate is contacted by the conveying roller, the steel plate is released by the previous fixed support and is sent away by the conveying roller.

[0023] Preferably, in the step S3, the rusting agent contains a metal cation oxidant with a stronger oxidation than Fe 2+ ; and / or

[0024] In the step S5, the rust layer stabilizing agent contains a water-soluble phosphate; and / or

[0025] In the step S5, the rust layer stabilizing agent contains a strong oxidant.

[0026] Preferably, in the step S3, the metal cation oxidant is Cu 2+ or Fe 3+ ; and / or

[0027] In the step S5, the phosphate is Mg(H2PO4)2, NaH2PO4 or KH2PO4; and / or

[0028] In the step S5, the strong oxidant is KMnO4 or KClO3.

[0029] Preferably, in the on-line rusting and rust layer stabilizing treatment method of the steel plate in the limited space, the waste liquid generated in the on-line rusting and rust layer stabilizing treatment method of the steel plate in the limited space is collected by the recycling tank of the on-line rusting and rust layer stabilizing treatment of the steel plate; and / or

[0030] After the step S8 is completed, the previous fixed support is rotated downward and is conveyed to the incoming area by the conveying device for the next treatment.

[0031] Preferably, in the on-line rusting and rust layer stabilizing treatment method of the steel plate in the limited space, a reducing acid is periodically added to the recycling tank to convert the waste liquid into Fe 3+ oxidant in the rusting agent.

[0032] Preferably, the walking speed V of the steel plate in the treatment zone is:

[0033]

[0034] Wherein, V0 is the walking speed of the side-standing steel plate, in units of m / min;

[0035] a is the length of the steel plate along the direction of the incoming material, in units of m;

[0036] d is the spacing between the side-standing steel plates, in units of m.

[0037] The second aspect of the present application provides an online rusting and rust layer stabilizing treatment equipment for the online rusting and rust layer stabilizing treatment method in a limited space as described in the first aspect of the present application, characterized in that it comprises:

[0038] an equipment body;

[0039] a conveying device comprising a conveying track and a conveying mechanism arranged on the equipment body; the conveying track is arranged vertically on the bottom of the equipment body, and the conveying track is sequentially provided with an incoming material area, a side-standing area, a treatment area, a flattening area, an outgoing material area, and a recycling area;

[0040] a plurality of fixed supports for supporting and locking the steel plate and driving the steel plate to move along the conveying track under the action of the conveying mechanism;

[0041] a plurality of groups of spraying mechanisms arranged above the treatment area of the conveying track for spraying the steel plate on the conveying track;

[0042] a plurality of groups of blowing mechanisms arranged above the treatment area of the conveying track for blowing the steel plate on the conveying track after spraying;

[0043] a drying mechanism arranged above the treatment area of the conveying track for drying the steel plate to be discharged;

[0044] a recycling tank arranged below the conveying track for collecting waste liquid flowing down from the steel plate and the fixed support.

[0045] Preferably, the fixed support comprises a force-bearing rod for supporting the steel plate, a locking mechanism arranged at both ends of the force-bearing rod, and a buffer mechanism symmetrically arranged on both sides of the force-bearing rod;

[0046] Both sides of the force-bearing rod are provided with a locking mechanism, and the locking mechanism is used to fix the steel plate on the force-bearing rod.

[0047] Preferably, the locking mechanism and the buffer mechanism both adopt a telescopic structure.

[0048] Preferably, the conveying track is arranged in an oval track shape, which is composed of two straight tracks and circular arc tracks symmetrically arranged at two ends of the straight tracks.

[0049] The incoming area and the outgoing area are symmetrically arranged in the circular arc tracks; the processing area and the recycling area are separately arranged in the two straight tracks, and the processing area is arranged above the recycling area.

[0050] Preferably, the processing area is sequentially provided with a rusting agent spraying area, a wetting and drying area, a stabilizing and drying area and a drying area.

[0051] The plurality of spraying mechanisms are separately arranged at the top of the rusting agent spraying area, the wetting and drying area and the stabilizing and drying area.

[0052] The plurality of blowing mechanisms are separately arranged at the top of the wetting and drying area and the stabilizing and drying area.

[0053] The drying mechanism is arranged at the top of the drying area.

[0054] Preferably, the recycling tank includes a first recycling tank arranged below the incoming area and the rusting agent spraying area, and a second recycling tank arranged below the wetting and drying area, the stabilizing and drying area, the drying area and the outgoing area.

[0055] The online rusting and rust layer stabilizing treatment method and device for steel plates in a limited space provided by the present application have the following beneficial effects:

[0056] 1. The online rusting and rust layer stabilizing treatment method and device for steel plates in a limited space can realize rapid rusting treatment of the surface of weathering steel, and the pipeline of the device occupies a very small area. The length of the process pipeline is related to the length and thickness of the steel plate. According to the calculation of a 10-meter-long, 4-6cm-thick weathering steel plate, the process pipeline site using the technology of the present application is only 1% of the conventional treatment line without using the technology of the present application. The weathering steel plates of various sizes with a walking speed of 100m / min can be synchronously and rapidly rusted in a limited space of 10m x 20m.

[0057] 2. The bare weathering steel produced by the online rusting and rust layer stabilizing treatment method for steel plates in a limited space has a uniform rust layer, which avoids the problems of slow rust layer formation, uneven rust layer color, yellow rust dripping and rust slag falling during the use of the weathering steel in the prior art.

[0058] 3. The online rusting and rust layer stabilizing treatment method for steel plates in a limited space can rapidly rust the steel plates by using the pipeline device, and the process and material costs are much lower than those of coating.

[0059] 4. The online rust formation and rust layer stabilization treatment method for steel plates in a confined space of the present invention can quickly rust weathering steel by using only conventional salt and a small amount of water. All substances participate in the reaction during the process, with no emissions, and the manufacturing process is safe and environmentally friendly.

[0060] 5. The bare weathering steel with rust layer prepared by the online rusting and rust layer stabilization treatment method of steel plate in a limited space of the present invention can be welded by simply grinding the bevel. Moreover, it can be put into normal service without any treatment after welding. The weld will naturally form a protective rust layer during service and will be integrated with other parts after the final rust layer stabilizes. If there are high requirements for early appearance, the weld can also be subjected to simple and rapid rusting treatment.

[0061] 6. The method for online rust formation and rust layer stabilization treatment of steel plates in a confined space of the present invention realizes the recycling of waste liquid, which is more environmentally friendly and can also save material costs, thus achieving both economic benefits.

[0062] 7. The method for online rust formation and rust layer stabilization treatment of steel plates in a limited space of the present invention produces rust plates of uniform size, which can facilitate subsequent packaging, transportation and use. Attached Figure Description

[0063] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0064] Figure 1 This is a schematic diagram of the structure of the online rust formation and rust layer stabilization treatment equipment for steel plates in a confined space according to the present invention;

[0065] Figure 2 A schematic diagram of an outdoor exposure test apparatus for evaluating the corrosion resistance of bare weathering steel prepared in this invention by the weight gain method;

[0066] Figure 3 The corrosion weight gain rate curves are shown for the bare weathering steel prepared according to the present invention and the same type of weathering steel that has not been treated by the present invention, obtained through outdoor exposure treatment experiments. Detailed Implementation

[0067] To better understand the above-mentioned technical solutions of the present invention, the technical solutions of the present invention will be further described below in conjunction with embodiments.

[0068] The method for on-line rusting and rust layer stabilization treatment of steel plates in limited space provided by the application is realized by using chemical method to complete the rusting treatment of steel plates on line, to make the steel plate surface generate uniform rust layer, and then spraying the rust layer fast stabilization reagent on the steel plate surface to complete the fast stabilization process of the rust layer on line, so as to finally realize the completion of the rusting and rust layer stabilization treatment of the steel plate in limited space. Specifically, the method can complete the rusting process which needs 3-6 months in natural environment on line, and complete the rust layer stabilization process which needs 4-8 years in natural environment on line through automatic treatment of the flow line. The significant advantage of the application is that the space is saved through the on-line rusting and rust layer stabilization treatment equipment of the steel plate, and the continuous on-line treatment of the weathering steel plate with a walking speed of 100 m / min can be completed in the production line range of 10-20 m.

[0069] In combination Figure 1 As shown in the figure, the method of the application completes the on-line rusting and rust layer stabilization treatment of the steel plate through the processes of incoming material, side standing, oxidation and airing, wetting and airing, stabilization and airing, drying, laying flat and feeding, and is fully automatic and batch. The airing time is greatly shortened through the means of vertical drainage and accelerated air circulation, and the whole process time is compressed to 10-40 min. The specific steps of the method of the application are as follows:

[0070] S1, incoming material, first, the continuous steel strip is transversely cut into steel plates 1 with uniform length, and then the steel plates 1 are conveyed on line to the upper side of the fixed support 2 of the incoming material area of the on-line rusting and rust layer stabilization treatment equipment of the steel plate through the conveying roller, after the steel plates 1 are stabilized, the fixed support 2 is lifted to contact the lower plane of the steel plates 1 under the action of the conveying mechanism, then the locking mechanism 8 on the fixed support 2 automatically extends and locks the steel plates 1, and the fixed support 2 below and the buffer mechanism 9 on the fixed support 2 support the steel plates 1;

[0071] S2, side standing, the fixed support 2 and the steel plates 1 are slowly lifted and rotated by 90° along the conveying track 3 under the action of the conveying mechanism, until the upper surface of the steel plates 1 contacts the previous fixed support 2 and the buffer mechanism 9 thereon, then the locking mechanism 8 of the previous fixed support 2 automatically extends and locks the steel plates 1, to ensure that the steel plates 1 are always controlled by the next fixed support 2 and the previous fixed support 2, and the side standing of the steel plates 1 is completed; wherein the locking mechanism 8 and the buffer mechanism 9 on the fixed support 2 are telescopic, and can be automatically adjusted and adapted according to different plate thickness and plate width;

[0072] S3, oxidation and airing, the steel plates 1 after the completion of the side standing are conveyed into the treatment area under the action of the conveying mechanism, the spraying mechanism 4 above the rusting agent spraying area C in the treatment area is started to spray the rusting agent 10 on the surface of the steel plates 1, and after the steel plates 1 are dried, the oxidizing agent in the rusting agent 10 takes away the free electrons of the iron atoms on the surface of the steel plates 1, to make them become Fe 2+The Fe atoms on the surface of steel plate 1 are oxidized to Fe2+. 2+ At this point, the surface of steel plate 1 turns green or reddish-brown; the rust-forming agent 10 contains an oxidizing agent that can oxidize iron atoms on the surface of steel plate 1 into ferrous ions, such as an oxidizing agent with stronger oxidizing power than Fe. 2+ Metal cation oxidizing agents, such as Cu 2+ Oxidizing agent or Fe 3+ Oxidizing agents, etc.;

[0073] S4, Wetting and Drying: After being processed in step S3, the steel plate 1 is moved to the next process by the conveyor mechanism, namely, the wetting and drying zone D of the processing area. The spraying mechanism 4 and the blowing mechanism 5 at the top of this zone are activated, repeatedly spraying water onto the steel plate 1 and passing compressed air 12 to accelerate drying. Through this process, Fe adhering to the surface of the steel plate 1 is promoted... 2+ The ions undergo hydrolysis to become iron hydroxide and its hydrate precipitate. Then, the iron hydroxide and its hydrate precipitate are dehydrated under compressed air 12 and react with oxygen in compressed air 12 to gradually become rust. That is, through the above process, rust is generated on the surface of steel plate 1 to form a rust layer. At this time, the surface of steel plate 1 turns yellow or yellowish-brown.

[0074] S5. Stabilization and Drying: After treatment in step S4, the steel plate 1 enters the next process, namely the stabilization and drying zone E, driven by the conveyor mechanism. The spraying mechanism 4 and blowing mechanism 5 above this zone are activated, spraying rust stabilizing agent 13 onto the surface of the steel plate 1 and accelerating drying with compressed air 12. The rust stabilizing agent 13 helps to seal the early rust pores and micro-cracks in the steel plate 1, until the rust stabilization of the steel plate 1 is complete. At this point, the rust layer turns brown or coffee-colored. The rust stabilizing agent 13 contains cocoa to seal the early rust pores and micro-cracks in the steel plate 1. The components that help seal the rust layer include water-soluble phosphate reagents such as Mg(H2PO4)2, NaH2PO4, and KH2PO4. The rust layer stabilizing agent 13 may also contain components that accelerate the solid-phase transformation of the rust layer, causing γ-FeOOH to rapidly transform into α-FeOOH. Strong oxidants such as KMnO4 and KClO3 are recommended. The rust layer stabilizing agent 13 enhances the corrosion resistance of the steel plate 1 by sealing the pores and cracks on the rust layer through phosphates, and accelerates the transformation of γ-FeOOH to α-FeOOH through the reagent, thereby achieving rapid stabilization of the rust layer.

[0075] S6, Drying: The steel plate 1 after step S5 enters the drying zone F, where the drying mechanism 6 accelerates the evaporation of moisture from the steel plate 1 and the rust layer through radiation heating or hot air baking; for example, hot air 14 is introduced into the drying mechanism 6 to treat the steel plate 1 and the rust layer.

[0076] S7, the steel plate 1 and the moisture in the rust layer volatilize, the locking mechanism of the rear fixed support 2 loosens the edge of the steel plate 1, the steel plate 1 is slowly flattened under the driving of the conveying mechanism, and is directly caught by the conveying roller;

[0077] S8, feeding, the locking mechanism 8 of the front fixed support 2 loosens the edge of the steel plate 1 after the steel plate 1 is contacted by the conveying roller, and the steel plate 1 is sent away by the conveying roller.

[0078] When the steel plate 1 is sent away, the front fixed support 2 rotates downward to the circulation area, the front fixed support 2 is conveyed to the incoming area by the conveying mechanism for the next time, and the rust on the surface of the fixed support 2 can be continuously sprayed by a plurality of spraying mechanisms 4 installed above the fixed support 2 (non-rail area in the middle of the conveying rail 3) to clean the rust. The waste liquid generated in the above-mentioned limited space in the on-line rusting and rust layer stabilizing treatment method of the steel plate 1 is collected by the recycling tank 7 of the on-line rusting and rust layer stabilizing treatment of the steel plate 1; wherein the rusting agent 10 flowing down the steel plate 1 is collected and recycled by the first recycling tank 7a below the feeding area A and the rusting agent spraying area C, the rust layer stabilizing agent 13 is collected and recycled by the second recycling tank 7b below the wetting and drying area D, the stabilizing and drying area E, the drying area F and the discharging area H, and the rust flowing down can be replaced into Fe 3+ ion by adding a reducing acid to the recycling tank 7 periodically, the reducing acid can be dilute hydrochloric acid or other reducing acids, and the reducing acid replaces the oxygen in the rust to become Fe 3+ cation oxidant in the rusting agent 10.

[0079] In the above-mentioned treatment process, the walking speed V of the steel plate 1 in the treatment area is:

[0080]

[0081] Wherein, V0 is the advancing speed of the side-standing front steel plate 1, and the unit is m / min;

[0082] a is the length of the steel plate 1 along the incoming direction, and the unit is m;

[0083] d is the spacing between the side-standing steel plates 1, and the unit is m.

[0084] Therefore, the treatment method of the present application can greatly shorten the production line length, and the production line length L is determined by the following formula:

[0085]

[0086] Wherein, V0 is the running speed of the side-standing front steel plate 1, the unit is m / min; a is the length of the steel plate 1 along the running direction of the material, the unit is m; b is the width of the steel plate 1, the unit is m; d is the spacing between the side-standing steel plates 1, the unit is m; t is the total time of the surface treatment process.

[0087] After the above treatment, the surface of the weathering steel has a uniform and stable rust layer, and the early rust layer corrosion weight gain rate is only within 50% of the untreated same material. The rust layer of the treated weathering steel contains α-FeOOH, and the Raman spectrum of the rust layer exposed to the outdoors for 15 days has a clear α-FeOOH peak, and the peak height is greater than 5 cps, which is equivalent to an outdoor exposure sample for eight years.

[0088] As shown in Figure 1 The equipment used in the on-line rusting and rust layer stabilization treatment method in the limited space includes an equipment body, a conveying device, a plurality of fixed supports 2, a plurality of spraying mechanisms 4, a plurality of blowing mechanisms 5, a drying mechanism 6, and a recycling tank 7.

[0089] As shown in Figure 1 The conveying device includes a conveying track 3 and a conveying mechanism arranged on the equipment body. The conveying track 3 is arranged vertically with the bottom of the equipment body, and the conveying track 3 is sequentially provided with a material inlet area, a side-standing area B, a treatment area, a flat laying area G, a material outlet area H, and a recycling area. In a preferred embodiment, the conveying track 3 is arranged in an oval racetrack shape, which is composed of two straight tracks and circular arc tracks symmetrically arranged at the two ends of the straight tracks. The material inlet area and the material outlet area H are symmetrically arranged in the circular arc tracks. The treatment area and the recycling area are arranged in the two straight tracks, and the treatment area is arranged above the recycling area. The rusting agent spraying area C, the wetting and drying area D, the stabilization and drying area E, and the drying area F are sequentially arranged in the treatment area. The plurality of spraying mechanisms 4 are arranged at the top of the rusting agent spraying area C, the wetting and drying area D, and the stabilization and drying area E. The spraying mechanism 4 arranged at the top of the rusting agent spraying area C is used to spray the rusting agent 10 on the steel plate 1. The spraying mechanism 4 arranged at the top of the wetting and drying area D is used to spray water 11 on the steel plate 1. The spraying mechanism 4 arranged at the top of the stabilization and drying area E is used to spray the rust layer stabilization reagent 13 on the steel plate 1. The plurality of blowing mechanisms 5 are arranged at the top of the wetting and drying area D and the stabilization and drying area E. The blowing mechanism 5 arranged at the top of this area is used to dry the steel plate 1. The drying mechanism 6 is arranged at the top of the drying area F. The drying mechanism 6 can use radiation heating or hot air baking to accelerate the evaporation of water from the steel plate 1 and the rust layer.

[0090] As shown in Figure 1As shown, a plurality of fixed supports 2 are used to support and lock the steel plate 1, and drive the steel plate 1 to move along the conveying track 3 under the action of the conveying mechanism; in a specific embodiment, the fixed support 2 comprises a force-bearing rod for supporting the steel plate 1, a locking mechanism 8 arranged at both ends of the force-bearing rod, and a buffer mechanism 9 symmetrically arranged on both sides of the force-bearing rod; wherein both sides of the force-bearing rod are provided with the locking mechanism 8, and the locking mechanism 8 is used to fix the steel plate 1 on the force-bearing rod; taking the fixed support 2 in the feeding area as an example, the upper surface and the lower surface of the force-bearing rod are provided with the locking mechanism 8, and the locking mechanism 8 on the upper surface or the lower surface of the force-bearing rod can lock the steel plate 1 on the fixed support 2. The locking mechanism 8 and the buffer mechanism 9 on the force-bearing rod are both telescopic structures, which can automatically adapt and adjust according to steel plates 1 of different thicknesses and widths.

[0091] In combination Figure 1 As shown, a plurality of groups of spraying mechanisms 4 are arranged above the conveying track 3 processing area, which are used to spray the steel plate 1 on the conveying track 3, such as spraying rust agent 10 or water 11.

[0092] In combination Figure 1 As shown, a plurality of groups of blowing mechanisms 5 are arranged above the conveying track 3 processing area, which are used to blow the steel plate 1 on the conveying track 3 after spraying treatment;

[0093] In combination Figure 1 As shown, the drying mechanism 6 is arranged above the conveying track 3 processing area, which is used to dry the steel plate 1 to be discharged; the drying mechanism 6 can adopt radiation heating or hot air baking to volatilize the moisture in the steel plate 1 and the rust layer.

[0094] In combination Figure 1 As shown, the recycling tank 7 is arranged below the conveying track 3, which is used to collect the waste liquid flowing down from the steel plate 1 and the fixed support 2; wherein the recycling tank 7 comprises a first recycling tank 7a arranged below the feeding area A, the rust agent spraying area C, and the wetting and drying area D, and a second recycling tank 7b arranged below the stabilization and drying area E, the drying area F, and the discharging area H; the first recycling tank 7a is mainly used to collect the rust agent 10 and water 11 flowing down from the steel plate 1 in the rust agent spraying area C; the second recycling tank 7b is mainly used to collect the rust layer stabilization reagent 13, rust, and water 11 flowing down from the steel plate 1. A plurality of spraying mechanisms 4 are arranged above the recycling area, and the plurality of spraying mechanisms 4 are specifically arranged above the recycling area in the transverse direction along the trackless area in the middle of the conveying track 3, which are mainly used to continuously spray water on the fixed support 2 in the recycling area to clean the rust on the surface of the fixed support 2.

[0095] The following will further introduce the steel plate online rusting and rust layer stabilization treatment method and equipment in a limited space according to specific examples.

[0096] Embodiment

[0097] In the embodiment, the steel plate BC550 is taken as an example, the steel plate is treated by the on-line rusting and rust layer stabilizing treatment method and equipment, and the specific process is as follows:

[0098] S1, incoming material: the continuous steel plate is first cut into steel plates with uniform length, the steel plates are conveyed to the upper side of the fixed support by the conveying roller, then the fixed support is lifted to the lower surface of the steel plate under the driving of the conveying mechanism, then the telescopic locking mechanism at the edge of the fixed support automatically extends and locks the steel plate, and the force rod and the buffer mechanism of the fixed support under the steel plate support the steel plate.

[0099] S2, side standing: the fixed support and the steel plate thereon are slowly lifted and rotated by 90 degrees under the driving of the conveying mechanism, until the other surface of the steel plate contacts the force rod and the buffer mechanism of the previous fixed support, the telescopic locking mechanism at the edge of the previous support extends and locks the steel plate, so that the steel plate is always controlled by the front and rear fixed supports, and the side standing operation is completed. The locking mechanism and the buffer mechanism of the fixed support are telescopic, and can be automatically adjusted and adapted according to different plate thickness and plate width.

[0100] S3, oxidation and drying: after the side standing operation of the steel plate and the fixed support is completed, the spraying mechanism starts to spray a layer of fast rusting agent on the steel plate, and after drying, the oxidizing agent in the rusting agent takes away the free electrons of the iron atoms on the surface of the steel plate, so that the Fe 2+ ions are attached to the surface of the steel plate, and the surface of the steel plate becomes green or red-brown.

[0101] S4, wetting and drying: under the driving of the conveying mechanism, the fixed support enters the next process, the spraying mechanism starts to repeatedly spray water on the steel plate, and the blowing mechanism starts to blow compressed air to accelerate drying, so that the Fe 2+ ions attached to the surface of the steel plate are hydrolyzed into iron hydroxide and its hydrate precipitate, then dehydrated and reacted with oxygen in the air to gradually become iron rust, and the steel plate becomes yellow or yellow-brown.

[0102] S5, stabilizing and drying: after the iron rust generated on the surface of the steel plate becomes yellow or yellow-brown, under the driving of the conveying mechanism, the fixed support enters the next process, the spraying mechanism starts to repeatedly spray the rust layer stabilizing reagent on the steel plate and dry, until the stabilizing is completed, and the rust layer becomes brown or coffee color.

[0103] S6, drying: after the steel plate completes the rust layer stabilizing, the steel plate automatically enters the next process, the drying mechanism starts to accelerate the volatilization of water in the steel plate and the rust layer by radiation heating or hot air baking.

[0104] S7, laying flat: after the water in the steel plate and rust layer is completely volatilized, the fastening mechanism of the rear fixed support at the edge of the steel plate is loosened, and the steel plate is slowly laid flat with the front fixed support under the drive of the conveying mechanism until it is caught by the conveying roller.

[0105] S8, feeding: after the steel plate is caught by the conveying roller, the fastening mechanism of the front fixed support at the edge of the steel plate is loosened, and the steel plate is sent away by the conveying roller.

[0106] S9, cycle: after the treatment is completed, the fixed support continues to rotate downward and is conveyed to the steel plate inlet position (i.e. the incoming area) by the conveying mechanism for the next treatment. During the cycle, the fixed support can be continuously sprayed with water through the spraying mechanism to clean the rust on the surface of the fixed support. The waste liquid generated during the entire treatment process is collected separately, and the flowing rust agent and rust layer stabilizing agent on the steel plate are respectively recovered and recycled by the first and second recycling tanks, and the flowing rust water is replaced by Fe 3+ after being reduced by the reducing acid in the recovery tank.

[0107] The specific process parameters involved in Examples 1-8 are shown in Table 1, and the concentrations of the following rust agent solutions are all percentages;

[0108] The rusted sample plates (test plates) produced in the above examples and the bare BC550 plates (control plates) are subjected to outdoor exposure experiments, and the impurities and corrosion products falling off the sample plates are weighed periodically. Figure 2 The sample plates (test plates and control plates) are hung above the beaker, and one diagonal line of the sample plate is parallel to the horizontal direction, and the other diagonal line is inclined at an angle of 45 degrees to the vertical direction. The beaker is used to collect the corrosion products and other impurities falling off the sample plate, and the vertical projection of the sample plate is entirely within the vertical projection range of the beaker opening to ensure that all the substances falling off the sample plate enter the beaker. The placement of the control plate and the test plate and the environment are kept highly consistent. The exposure is carried out in Shanghai, China (the average atmospheric salt content is less than 0.05 mg NaCl / dm2 / day), the sample plates are placed on the rack in September of the year, and the experiment ends in November of the year. The total weight gain of the sample plates and the device is measured periodically, as shown in Figure 3 It can be seen that the corrosion weight gain of the sample plates treated by the method of the present application within the first two months is only within 50% of that of the untreated bare plate, and after 15 days of exposure, the rust powder on the surface of the sample plate is scraped off, and the Raman spectrum analysis of the rust powder shows that there is a clear α-FeOOH peak in the corresponding Raman spectrum, and the peak height is greater than 5 cps, which is comparable to the eight-year outdoor exposure sample plate and significantly better than the rust layer exposed for 1-2 years.

[0109] Table 1 Main process parameters in the examples

[0110]

[0111] Those skilled in the art will recognize that the above-described embodiments are merely illustrative of the application and should not be construed as limiting the scope of the application. Variations and modifications to the embodiments disclosed herein can be made based on the description set forth herein, without departing from the scope and spirit of the application as recited in the following claims.

Claims

1. A method for on-line rusting and stabilizing of rust layer of steel sheet in a limited space, characterized in that, The method comprises the following steps: S1, incoming material; S2, side standing; S3, rusting; S4, wetting and drying; S5, stabilizing and drying; S6, drying; S7, laying flat; and S8, feeding. The method comprises the following steps: S1, incoming material; S2, side standing; S3, rusting; S4, wetting and drying; S5, stabilizing and drying; S6, drying; S7, laying flat; and S8, feeding. S1, incoming material; S2, side standing; S3, rusting; S4, wetting and drying; S5, stabilizing and drying; S6, drying; S7, laying flat; and S8, feeding. S1, incoming material; S2, side standing; S3, rusting; S4, wetting and drying; S5, stabilizing and drying; S6, drying; S7, laying flat; and S8, feeding. S3, oxidation and drying, the steel plate after side standing enters into the treatment area, in the rusting agent spraying area of the treatment area, the rusting agent is sprayed to the surface of the steel plate, after the steel plate is dried, the oxidant in the rusting agent oxidizes the Fe atom on the surface of the steel plate into Fe 2+ ions; S1, incoming material; S2, side standing; S3, rusting; S4, wetting and drying; S5, stabilizing and drying; S6, drying; S7, laying flat; and S8, feeding. S1, incoming material; S2, side standing; S3, rusting; S4, wetting and drying; S5, stabilizing and drying; S6, drying; S7, laying flat; and S8, feeding. S1, incoming material; S2, side standing; S3, rusting; S4, wetting and drying; S5, stabilizing and drying; S6, drying; S7, laying flat; and S8, feeding. S1, incoming material; S2, side standing; S3, rusting; S4, wetting and drying; S5, stabilizing and drying; S6, drying; S7, laying flat; and S8, feeding.

2. The method according to claim 1, wherein: in the step S5, the rust stabilizing agent comprises a water-soluble phosphate; and / or in the step S5, the rust stabilizing agent comprises a strong oxidant.

3. The method according to claim 2, wherein: in the step S5, the phosphate is Mg(H2PO4)2, NaH2PO4 or KH2PO4; and / or in the step S5, the strong oxidant is KMnO4 or KClO3. In the step S3, the rusting agent contains a metal cation oxidant having a stronger oxidizing power than Fe 2+ metal cation oxidant; and / or 4. The method according to claim 1, wherein: the waste liquid generated in the method is collected in a recycling tank of the steel plate online rusting and rust layer stabilizing treatment; and / or after the step S8, the previous fixed support is rotated downward and conveyed to the incoming material area by a conveying mechanism for the next treatment. ​ ​ The metal cation oxidizing agent in step S3 is Cu 2+ oxidizing agent or Fe 3+ oxidizing agent; and / or ​ ​ ​ ​ ​ 5. The method for online rusting and rust layer stabilizing treatment of steel sheets in a limited space according to claim 4, characterized by, In the method for on-line rusting and rust layer stabilizing treatment of steel plates in a limited space, a reducing acid is periodically added to the recycling tank to convert the waste liquid into Fe in the rusting agent 3+ oxidizing agent.

6. The method of claim 1, wherein the steel plate has a running speed V in the treatment zone, and wherein V = V0 (a / d), wherein V0 is the running speed of the incoming steel plate, a is the length of the steel plate in the incoming direction, and d is the distance between the steel plates after being stood up. The device comprises: ； a device body; a conveying device comprising a conveying track and a conveying mechanism arranged on the device body; the conveying track is arranged vertically on the bottom of the device body, and the conveying track is sequentially provided with an incoming area, a standing area, a treatment area, a flattening area, an outgoing area, and a recycling area; 7. A steel sheet on-line rusting and rust layer stabilizing treatment apparatus for performing the steel sheet on-line rusting and rust layer stabilizing treatment method according to any one of claims 1 to 6, characterized by a plurality of fixed supports for supporting and locking the steel plate and moving the steel plate along the conveying track under the action of the conveying mechanism; a plurality of spraying mechanisms arranged above the treatment area of the conveying track for spraying the steel plate on the conveying track; a plurality of blowing mechanisms arranged above the treatment area of the conveying track for blowing the steel plate on the conveying track after spraying; a drying mechanism arranged above the treatment area of the conveying track for drying the steel plate to be discharged; a recycling tank arranged below the conveying track for collecting the waste liquid flowing down from the steel plate and the fixed support. The fixed support comprises a force-bearing rod for supporting the steel plate, locking mechanisms arranged at both ends of the force-bearing rod, and buffer mechanisms symmetrically arranged on both sides of the force-bearing rod. The force-bearing rod is provided with locking mechanisms on both sides, and the locking mechanisms are used to fix the steel plate on the force-bearing rod. The locking mechanisms and the buffer mechanisms are both retractable structures. The conveying track is arranged in an oval racetrack shape, which is composed of two straight tracks and circular arc tracks symmetrically arranged at both ends of the straight tracks.

8. The steel sheet on-line rusting and rust layer stabilizing treatment apparatus according to claim 7, characterized by The incoming area and the outgoing area are symmetrically arranged in the circular arc tracks, and the treatment area and the recycling area are arranged in the two straight tracks, with the treatment area arranged above the recycling area. The treatment area is sequentially provided with a rusting agent spraying area, a wetting and drying area, a stabilization and drying area, and a drying area.

9. The steel sheet on-line rusting and rust layer stabilizing treatment apparatus according to claim 8, characterized by The plurality of spraying mechanisms are arranged at the top of the rusting agent spraying area, the wetting and drying area, the stabilization and drying area, and the recycling area, the spraying mechanism at the top of the rusting agent spraying area sprays the rusting agent to the surface of the steel plate, the spraying mechanism at the top of the stabilization and drying area sprays the rust layer stabilization reagent to the surface of the steel plate, and the spraying mechanism at the top of the recycling area sprays water to the fixed support.

10. The steel sheet on-line rusting and rust layer stabilizing treatment apparatus according to claim 7, characterized by The plurality of blowing mechanisms are arranged at the top of the wetting and drying area and the stabilization and drying area. The drying mechanism is arranged at the top of the drying area.

11. The steel sheet on-line rusting and rust layer stabilizing treatment apparatus according to claim 10, characterized by The recycling tank comprises a first recycling tank arranged below the incoming area, the rusting agent spraying area, and the wetting and drying area, and a second recycling tank arranged below the stabilization and drying area, the drying area, and the outgoing area. ​ ​ ​ 12. The steel sheet on-line rusting and rust layer stabilizing treatment apparatus according to claim 10, wherein ​

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