Efficient hot rolled plate rust removal device and process

Abstract

The invention discloses an efficient hot-rolled plate rust removal device and process. The efficient hot-rolled plate rust removal device comprises an uncoiling device, an abrasive water jet device, a pickling device and a coiling device which are sequentially arranged. The uncoiling device is used for straightening a bent plate; the abrasive water jet device is used for conducting preliminary rust removal on the two sides of the plate and comprises an abrasive water jet spray gun and a high-pressure water spray gun, and the abrasive water jet spray gun is arranged close to the uncoiling device; the pickling device comprises a pickling tank and a washing tank, the pickling tank is used for pickling and derusting the plates, and the washing tank is used for washing the plates subjected to pickling and derusting; and the coiling device is used for coiling the washed plates. The device integrates the advantages of an abrasive water jet and a pickling device, compared with a traditional hydrochloric acid pickling and abrasive water jet rust removal device, rust removal is more complete and thorough, plates subjected to rust removal through environment-friendly acid are not prone to re-rusting, the acid recovery cost is low, the treatment capacity is large, pungent smell is not prone to volatilization, and the device is environmentally friendly.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgical engineering, and in particular to an efficient hot-rolled plate rust removal device and process. Background Art

[0002] Steel is exposed to the air, because there is water and oxygen in the air, so the steel will rust, which greatly affects the use and sales of steel. However, the rust of steel is inevitable, unless it is placed in a vacuum area, which is of course unrealistic. Therefore, finding a rust removal device and process with good rust removal performance and low cost has become an urgent problem to be solved.

[0003] Existing rust removal processes include chemical rust removal and physical rust removal. Chemical rust removal generally refers to methods such as pickling, but such methods can lead to various disadvantages: First, the chemical method itself has certain damage to the iron matrix and has strict requirements on the rust removal time. Improper time management will lead to poor rust removal effect or excessive rust removal that damages the iron matrix; second, as environmental awareness gradually gains popularity, the pollution of chemical drugs should be gradually reduced; third, chemical methods such as pickling, the volatile substances in the acid can cause harm to the human body, etc., so physical rust removal has become the mainstream rust removal method. Physical rust removal methods mainly include high-pressure water jet, sandblasting, shot blasting and other methods.

[0004] At present, the application scenarios of high-pressure water jets are becoming more and more extensive, mainly including two processes: high-pressure pure water jet method and high-pressure abrasive water jet method. High-pressure water jet mainly uses a pressure pump to pressurize water to a certain pressure value, and directly sprays it on the material that needs to be rusted with a spray gun to achieve the purpose of rust removal. However, using only pure water will have disadvantages such as incomplete rust removal and high noise during rust removal. The abrasive water jet method uses abrasives and water to mix in the silo, and then pressurizes it through a pressure pump, and sprays it evenly on the material that needs to be rusted. In this process, the rust on the iron matrix is ​​peeled off, so as to achieve the purpose of rust removal. However, abrasive water jets have higher requirements for nozzles, because abrasives will cause certain damage to the nozzles. The abrasive water jet method also has high requirements for the silo where abrasives are stored and its supporting delivery pipes to prevent blockage and affect the spraying.

[0005] At present, the pickling process generally uses hydrochloric acid and other inorganic acids for pickling. This type of acid has a short rust removal time and low price, and has become the preferred pickling raw material for many steel mills. However, this type of acid is easy to volatilize a pungent odor, the recycling cost is high, and the pickling time is too long and it is easy to corrode the iron matrix. Therefore, the pickling process must develop in the direction of reducing environmental pollution, low recycling cost, and less harm to the human body in the future. Summary of the invention

[0006] The purpose of the present invention is to provide an efficient hot-rolled plate rust removal device and process in view of the shortcomings of the existing pickling process, so as to solve the problems existing in the above-mentioned existing pickling process.

[0007] To achieve the above object, the present invention provides an efficient hot-rolled plate rust removal device, comprising an unwinding device, an abrasive water jet device, a pickling device and a coiling device which are arranged in sequence;

[0008] The unwinding device is used to straighten the bent plate;

[0009] The abrasive water jet device is used to perform preliminary rust removal on both sides of the plate, and the abrasive water jet device includes an abrasive water jet spray gun and a high-pressure water spray gun, and the abrasive water jet spray gun is arranged close to the unwinding device;

[0010] The pickling device comprises a pickling tank and a water washing tank, wherein the pickling tank is used to pickle and remove rust from the plate, and the water washing tank is used to wash the plate after pickling and removing rust;

[0011] The coiling device is used to coil the washed plate.

[0012] Preferably, the number of the abrasive water jet spray guns arranged on one side of the plate is not less than 5, and the distance between two adjacent abrasive water jet spray guns is 5 mm to 10 mm.

[0013] Preferably, the abrasive water jet spray gun comprises a water tank, a silo, a pressurizing device and an inner cavity of the abrasive water jet spray gun, the water tank is connected to the inner cavity of the abrasive water jet spray gun through the pressurizing device, and the silo is connected to the inner cavity of the abrasive water jet spray gun.

[0014] Preferably, the abrasive water jet spray gun is a front-mixing spray gun, and the inner cavity of the abrasive water jet spray gun includes a shell, and the interior of the shell is provided with an abrasive inlet, a high-pressure water inlet, a mixing bin and a nozzle, the central axis of the abrasive inlet and the central axis of the high-pressure water inlet intersect in the mixing bin, and the central axis of the high-pressure water inlet coincides with the central axis of the inlet end of the nozzle.

[0015] Preferably, the number of the high-pressure water spray guns arranged on one side of the plate is not less than 2, and the angle between the high-pressure water spray guns and the plate is 45°.

[0016] Preferably, the medium sprayed by the abrasive water jet spray gun includes water and abrasive, and the abrasive is quartz sand or corundum with a particle size of 0.5 mm.

[0017] Preferably, the pickling tank includes several water tanks arranged in succession, and an environmentally friendly acid is arranged in the water tank, the acidity of the environmentally friendly acid is not less than 10, and the components of the environmentally friendly acid include: 80-110 g / L of citric acid, 80-110 g / L of hydroxyethylidene diphosphonic acid, 30-50 g / L of sodium gluconate, 15-20 g / L of disodium ethylenediaminetetraacetic acid, and 6-10 g / L of polyethylene glycol.

[0018] Preferably, the length of the water tank is not less than 9 m, and the length of the washing tank is not less than 7 m.

[0019] An efficient hot-rolled plate rust removal process, using an efficient hot-rolled plate rust removal device, comprises the following steps:

[0020] The bent plate is straightened by the rollers in the unwinding device, and the plate feeding speed is controlled at 20m / min;

[0021] The plate is initially derusted by using a mixed high-pressure water-material mixture sprayed by an abrasive water jet spray gun, and the plate is rinsed by using a high-pressure water spray gun;

[0022] Use the pickling tank to pickle and remove rust from the plate. The pickling temperature in the pickling tank is 55°C, and the acidity of the environmentally friendly acid in the pickling tank is controlled to be no less than 10;

[0023] Use a water washing tank to wash the pickled and rust-removed plates to remove the acid and rust remaining on the plates;

[0024] Finally, the rust-removed plate is coiled by a coiling device.

[0025] Preferably, the distance between the abrasive water jet spray gun and the plate is 5 mm to 10 mm, and the mixing pressure of the mixed high-pressure water-material mixture sprayed by the abrasive water jet spray gun in the mixing material bin is 20 MPa to 40 MPa.

[0026] Compared with the prior art, the present invention has the following advantages and technical effects:

[0027] The efficient hot-rolled plate rust removal device provided by the present invention combines the advantages of abrasive water jet and pickling device, can remove rust more completely, and will not cause great damage to the hot-rolled plate. It is environmentally friendly and will not produce a particularly strong irritating odor in actual production. The acid can be recycled with low recovery cost, which provides a new research idea for environmentally friendly and economical rust removal of hot-rolled plates. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a structural schematic diagram of the hot-rolled plate rust removal device of the present invention;

[0030] Figure 2It is a schematic diagram of the structure of the abrasive water jet spray gun of the present invention;

[0031] Figure 3 It is a schematic diagram of the structure of the inner cavity of the abrasive water jet spray gun of the present invention;

[0032] In the figure: 1. unwinding device; 2. rolling roller; 3. abrasive water jet device; 4. abrasive water jet spray gun; 5. high-pressure water spray gun; 6. pickling device; 7. pickling tank; 8. washing tank; 9. winding device; 10. rolling roller; 11. water tank; 12. silo; 13. pressurizing device; 14. inner cavity of abrasive water jet spray gun; 15. abrasive inlet; 16. high-pressure water inlet; 17. mixing silo; 18. nozzle. DETAILED DESCRIPTION

[0033] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0034] like Figures 1 to 3 As shown, the present invention provides an efficient hot-rolled plate rust removal device, comprising an unwinding device 1, an abrasive water jet device 3, a pickling device 6 and a coiling device 9 which are arranged in sequence;

[0035] The unwinding device 1 is used to straighten the bent sheet;

[0036] The abrasive water jet device 3 is used to perform preliminary rust removal on both sides of the plate. The abrasive water jet device 3 includes an abrasive water jet spray gun 4 and a high-pressure water spray gun 5. The abrasive water jet spray gun 4 is arranged close to the unwinding device 1.

[0037] The pickling device 6 comprises a pickling tank 7 and a water washing tank 8. The pickling tank 7 is used for pickling and derusting the plate, and the water washing tank 8 is used for washing the plate after pickling and derusting.

[0038] The coiling device 9 is used to coil the washed plate.

[0039] According to a further optimization scheme, the number of abrasive water jet spray guns 4 arranged on one side of the plate is not less than 5, and the distance between two adjacent abrasive water jet spray guns 4 is 5 mm to 10 mm.

[0040] According to a further optimization scheme, the abrasive water jet spray gun 4 includes a water tank 11, a silo 12, a pressurizing device 13 and an abrasive water jet spray gun inner cavity 14. The water tank 11 is connected to the abrasive water jet spray gun inner cavity 14 through the pressurizing device 13, and the silo 12 is connected to the abrasive water jet spray gun inner cavity 14.

[0041] A further optimization scheme is that the abrasive water jet spray gun 4 is a front-mixing spray gun, and the inner cavity 14 of the abrasive water jet spray gun includes a shell, and the interior of the shell is provided with an abrasive inlet 15, a high-pressure water inlet 16, a mixing bin 17 and a nozzle 18. The central axis of the abrasive inlet 15 intersects with the central axis of the high-pressure water inlet 16 in the mixing bin 17, and the central axis of the high-pressure water inlet 16 coincides with the central axis of the inlet end of the nozzle 18.

[0042] The abrasive water jet spray gun 4 used in the present invention can not only make the abrasive better mixed into the high-pressure water to avoid the accumulation of abrasive in the mixing bin 13, but also ensure the water outlet depth of the high-pressure water after mixing with the abrasive, thereby ensuring the cleaning effect of rust on the plate.

[0043] According to a further optimization scheme, the number of high-pressure water spray guns 5 arranged on one side of the plate is not less than 2, and the angle between the high-pressure water spray gun 5 and the plate is 45°.

[0044] According to a further optimized solution, the medium sprayed by the abrasive water jet spray gun 4 includes water and abrasive, and the abrasive is quartz sand or corundum with a particle size of 0.5 mm.

[0045] To further optimize the solution, the pickling tank 7 includes several water tanks arranged in succession, in which environmentally friendly acid is arranged, the acidity of the environmentally friendly acid is not less than 10, and the components of the environmentally friendly acid include: citric acid 80-110 g / L, hydroxyethylidene diphosphonic acid 80-110 g / L, sodium gluconate 30-50 g / L, disodium ethylenediaminetetraacetic acid 15-20 g / L, and polyethylene glycol 6-10 g / L.

[0046] According to the further optimization scheme, the length of the water tank is not less than 9m, and the length of the washing tank 8 is not less than 7m.

[0047] An efficient hot-rolled plate rust removal process, using an efficient hot-rolled plate rust removal device, comprises the following steps:

[0048] The bent plate is straightened by the roller 2 in the unwinding device 1, and the plate feeding speed is controlled at 20 m / min;

[0049] The plate is preliminarily derusted by the mixed high-pressure water-material mixture sprayed by the abrasive water jet spray gun 4, and the plate is rinsed by the high-pressure water spray gun 5; in this process, the particle size of the abrasive is controlled to be 0.5 mm. When the abrasive sprayed by the abrasive water jet spray gun 4 hits the plate, it can cause the plate to vibrate slightly, which is conducive to the shedding of rust. If the abrasive particle size is too large, it is easy to damage the plate under high pressure. Although the abrasive particle size is too small, a certain rust removal effect can be achieved, it cannot cause the plate to vibrate to a certain amplitude, which is not conducive to the shedding of rust on the plate.

[0050] The plate is pickled and rust-removed in the pickling tank 7, the pickling temperature in the pickling tank is 55°C, and the acidity of the environmental acid in the pickling tank 7 is controlled to be not less than 10;

[0051] The plate after pickling and rust removal is washed with water in the washing tank 8 to remove the acid and rust remaining on the plate. When the iron ions in the washing tank accumulate to a certain level, the water needs to be replaced;

[0052] Finally, the rust-removed plate is coiled by the coiling device 9.

[0053] According to a further optimization scheme, the distance between the abrasive water jet spray gun 4 and the plate is 5 mm to 10 mm, and the mixing pressure of the mixed high-pressure water-material mixture sprayed by the abrasive water jet spray gun 4 in the mixing bin 17 is 20 MPa to 40 MPa.

[0054] Example 1

[0055] Take a roll of Q235 hot-rolled plate;

[0056] The hot rolled plate is unrolled by using the unrolling device 1, and the plate is straightened by using the roller 2 in the unrolling device 1;

[0057] The feeding speed of the plate is set to 20m / min. First, the plate is subjected to preliminary rust removal treatment by means of a symmetrical abrasive water jet spray gun 4, and the pressure in the spray gun is 40MPa. Then, a high-pressure water gun with the same pressure is set to spray off the abrasive and rust remaining on the plate.

[0058] Then it enters the pickling part, which consists of four pickling tanks and one water washing tank. The acid in the pickling tank is environmentally friendly acid. The plate enters the pickling tank and the water washing tank at a speed of 20m / min. The water washing tank can wash away the rust and residual acid on the plate;

[0059] After the plate is washed, it enters the coiling stage, and the rust-removed hot-rolled plate is coiled by a coiler through a roller 10 in the coiler to obtain the rust-removed hot-rolled plate.

[0060] The present invention combines the advantages of abrasive water jet and pickling device 6, which can remove rust more completely without causing great damage to hot-rolled plates, is environmentally friendly, does not produce particularly strong irritating odor in actual production, and the acid can be recycled with low recovery cost.

[0061] The above are only preferred specific implementations of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. An efficient hot-rolled plate rust removal device, characterized in that: It comprises an unwinding device (1), an abrasive water jet device (3), a pickling device (6) and a winding device (9) which are arranged in sequence; The unwinding device (1) is used to straighten the bent plate; The abrasive water jet device (3) is used to perform preliminary rust removal on both sides of the plate, and the abrasive water jet device (3) comprises an abrasive water jet spray gun (4) and a high-pressure water spray gun (5), and the abrasive water jet spray gun (4) is arranged close to the unwinding device (1); The pickling device (6) comprises a pickling tank (7) and a water washing tank (8), wherein the pickling tank (7) is used to pickle and remove rust from the plate, and the water washing tank (8) is used to wash the plate after pickling and removing rust; The coiling device (9) is used to coil the washed plate.

2. The efficient hot-rolled plate rust removal device according to claim 1 is characterized in that: The number of the abrasive water jet spray guns (4) arranged on one side of the plate is not less than 5, and the distance between two adjacent abrasive water jet spray guns (4) is 5 mm to 10 mm.

3. The efficient hot-rolled plate rust removal device according to claim 1 is characterized in that: The abrasive water jet spray gun (4) comprises a water tank (11), a material bin (12), a pressurizing device (13) and an inner cavity (14) of the abrasive water jet spray gun. The water tank (11) is connected to the inner cavity (14) of the abrasive water jet spray gun via the pressurizing device (13), and the material bin (12) is connected to the inner cavity (14) of the abrasive water jet spray gun.

4. The efficient hot-rolled plate rust removal device according to claim 3 is characterized in that: The abrasive water jet spray gun (4) is a front-mixing spray gun. The inner cavity (14) of the abrasive water jet spray gun comprises a shell. The interior of the shell is provided with an abrasive inlet (15), a high-pressure water inlet (16), a mixing bin (17) and a nozzle (18). The central axis of the abrasive inlet (15) intersects with the central axis of the high-pressure water inlet (16) in the mixing bin (17), and the central axis of the high-pressure water inlet (16) coincides with the central axis of the inlet end of the nozzle (18).

5. The efficient hot-rolled plate rust removal device according to claim 1 is characterized in that: The number of the high-pressure water spray guns (5) arranged on one side of the plate is not less than 2, and the angle between the high-pressure water spray guns (5) and the plate is 45°.

6. The efficient hot-rolled plate rust removal device according to claim 1, characterized in that: The medium sprayed by the abrasive water jet spray gun (4) includes water and abrasive, and the abrasive is quartz sand or corundum with a particle size of 0.5 mm.

7. The efficient hot-rolled plate rust removal device according to claim 1, characterized in that: The pickling tank (7) comprises a plurality of water tanks arranged in series, wherein an environmentally friendly acid is arranged in the water tank, wherein the acidity of the environmentally friendly acid is not less than 10, and the components of the environmentally friendly acid include: 80-110 g / L of citric acid, 80-110 g / L of hydroxyethylidene diphosphonic acid, 30-50 g / L of sodium gluconate, 15-20 g / L of disodium ethylenediaminetetraacetate, and 6-10 g / L of polyethylene glycol.

8. The efficient hot-rolled plate rust removal device according to claim 7, characterized in that: The length of the water tank is not less than 9 m, and the length of the washing tank (8) is not less than 7 m.

9. An efficient hot-rolled plate rust removal process, characterized in that: The use of the efficient hot-rolled plate rust removal device according to any one of claims 1 to 8 comprises the following steps: The bent plate is straightened by using the roller (2) in the unwinding device (1), and the plate feeding speed is controlled at 20 m / min; The plate is initially derusted using a mixed high-pressure water-material mixture sprayed from an abrasive water jet spray gun (4), and the plate is rinsed using a high-pressure water spray gun (5); The plate is pickled and rust-removed in a pickling tank (7), the pickling temperature in the pickling tank is 55° C., and the acidity of the environmental acid in the pickling tank (7) is controlled to be not less than 10; The plate after pickling and rust removal is washed with water in a washing tank (8) to remove the acid and rust remaining on the plate; Finally, the rust-removed plate is coiled by a coiling device (9).

10. The efficient hot-rolled plate rust removal process according to claim 9, characterized in that: The distance between the abrasive water jet spray gun (4) and the plate is 5 mm to 10 mm, and the mixing pressure of the mixed high-pressure water-material mixture sprayed by the abrasive water jet spray gun (4) in the mixing material bin (17) is 20 MPa to 40 MPa.

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