CN115572978A - Rapid and low-acid-consumption hot rolled steel plate pickling method - Google Patents
Rapid and low-acid-consumption hot rolled steel plate pickling method Download PDFInfo
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- CN115572978A CN115572978A CN202211313461.5A CN202211313461A CN115572978A CN 115572978 A CN115572978 A CN 115572978A CN 202211313461 A CN202211313461 A CN 202211313461A CN 115572978 A CN115572978 A CN 115572978A
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- steel plate
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 88
- 239000010959 steel Substances 0.000 title claims abstract description 88
- 238000005554 pickling Methods 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 36
- 239000002253 acid Substances 0.000 claims abstract description 80
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 55
- 239000007921 spray Substances 0.000 claims abstract description 50
- 229910052742 iron Inorganic materials 0.000 claims abstract description 28
- 238000011084 recovery Methods 0.000 claims abstract description 9
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 32
- 239000007788 liquid Substances 0.000 claims description 21
- 230000008569 process Effects 0.000 claims description 21
- 230000009471 action Effects 0.000 claims description 12
- 238000004064 recycling Methods 0.000 claims description 4
- -1 iron ions Chemical class 0.000 claims description 3
- 239000002699 waste material Substances 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 7
- 238000002791 soaking Methods 0.000 abstract description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 20
- 239000000243 solution Substances 0.000 description 11
- 238000005406 washing Methods 0.000 description 6
- 238000005096 rolling process Methods 0.000 description 5
- 238000005452 bending Methods 0.000 description 4
- 238000001035 drying Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- NGWKGSCSHDHHAJ-YPFQVHCOSA-N Liquoric acid Chemical compound C1C[C@H](O)C(C)(C)C2CC[C@@]3(C)[C@]4(C)C[C@H]5O[C@@H]([C@](C6)(C)C(O)=O)C[C@@]5(C)[C@@H]6C4=CC(=O)C3[C@]21C NGWKGSCSHDHHAJ-YPFQVHCOSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001603 reducing effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention belongs to the technical field of hot-rolled pickled plate production, and particularly relates to a quick and low-acid-consumption hot-rolled steel plate pickling method. A plurality of lower rollers and upper rollers are alternately distributed in the pickling tank along the moving direction of the steel plate, and the steel plate sequentially runs from left to right around the lower rollers and the upper rollers; an upper spray head is arranged at the upper right part of each lower roller, a spray nozzle of the upper spray head faces the lower roller, and the included angle between the spray direction and the vertical direction is 15 degrees; a lower spray head is arranged at the lower right side of each upper roller, a spray nozzle of each lower spray head faces the upper rollers, and an included angle between the spray direction and the vertical direction is 15 degrees; the bottom of the pickling tank is provided with a plurality of acid liquor recovery ports. According to the invention, high-pressure acid liquor is directly injected into cracks of the iron scale, and the high-pressure acid liquor is more fully contacted with the steel plate and the iron scale and has quicker reaction than soaking reaction; the invention increases the high-pressure descaling effect, not only can improve the pickling efficiency, but also can reduce the acid liquor consumption.
Description
Technical Field
The invention belongs to the technical field of hot-rolled pickled plate production, and particularly relates to a quick and low-acid-consumption hot-rolled steel plate pickling method.
Background
At present, the steel plates on the market are mainly divided into three types: cold rolled sheet, hot rolled sheet and pickled sheet. The cold-rolled sheet has high surface smoothness and high dimensional accuracy and is generally used for the outer surface of products, but the price of the cold-rolled sheet is higher than that of the hot-rolled sheet because the cold-rolled sheet is a hot-rolled sheet as a production raw material. The hot rolled sheet is processed and formed at high temperature, and the steel sheet is easy to react with oxygen at high temperature to generate iron scale, so that the surface quality of the steel sheet is far lower than that of the cold rolled sheet. The pickled sheet combines the advantages of cold-rolled sheets and hot-rolled sheets. On one hand, the pickled plate is directly pickled after hot rolling and then sold without a cold rolling process, so the price is slightly higher than that of a hot rolled plate and is far lower than that of a cold rolled plate. On the other hand, the pickling process can remove scales on the surface of the steel sheet, and therefore the surface quality of the pickled sheet is much better than that of the hot-rolled sheet.
In summary, the pickling plates are widely applied to internal bearing parts in the fields of automobiles, buildings, machinery and the like due to the advantages of high surface quality, good mechanical properties, low price and the like.
In the hot rolling process, the steel sheet is deformed at 800 to 1300 ℃, and at such a high temperature, the surface of the steel sheet is in contact with oxygen in the air and cooling water, and oxidation reaction occurs to generate scale. The scale on the surface of the steel plate is generally divided into three layers: feO in the innermost layer contacting with the steel plate matrix, and Fe in the middle 3 O 4 And Fe as the outermost layer 2 O 3 。
The pickling process aims to remove scales on the surface of the steel sheet using hydrochloric acid (HCl). In the prior art, acid washing mainly comprises the following procedures: uncoiling → straightening and scale breaking → pickling tank 1 → pickling tank 2 → pickling tank 3 → rinsing → drying → coiling.
In a conventional pickling line, a steel plate needs to pass through a straightening and descaling machine before contacting with acid liquor, and the structure of the steel plate is shown in fig. 1. The process has three functions: firstly, a steel plate is in contact with a pulling and straightening roller, and the surface iron oxide scale is positioned between the steel plate and the pulling and straightening roller and is easy to damage and peel under the action of rolling pressure; secondly, the other surface of the steel plate is subjected to the action of tensile force, and the iron scale can crack or peel off; thirdly, after the steel sheet is subjected to a straightening and withdrawal process, 1 to 3% of tensile deformation occurs, and cracks are introduced into the scale.
In a subsequent pickling tank, acid liquor can rapidly enter the inside of the iron scale through cracks, part of the acid liquor is in contact reaction with a steel substrate to generate hydrogen to generate a stripping effect, and the other part of the acid liquor is in chemical reaction with FeO to promote the dissolution of the FeO.
In order to reduce the difficulty of the subsequent acid washing process, the pulling, straightening and scale breaking process generally adopts large rolling reduction and large tension. However, this process also has 4 disadvantages: firstly, the total elongation of the steel plate is a fixed value, and the elongation of the finished steel plate is reduced by increasing the tensile deformation before pickling; secondly, after the stretched steel plate leaves the straightening and descaling machine, the rebound quantity can be generated, so that the straightening and withdrawal cracks are reduced; thirdly, the screw-down capability of the withdrawal and straightening machine is limited, and particularly, when high-strength steel is produced, the screw-down force of the withdrawal and straightening machine hardly meets the requirement of screw-down amount, so that the pickling effect is influenced; thirdly, the crushed iron scale remains on the surface of the steel plate, and the surface of the steel plate is damaged when the iron scale is rolled again.
In the conventional pickling process, three pickling tanks are provided, and all the three pickling tanks are filled with hydrochloric acid solutions with different concentrations, and during pickling, the steel plate sequentially passes through the hydrochloric acid solutions, so that the iron oxide scales on the surface of the steel plate are removed through the mechanical stripping action, the dissolving action and the reducing action. The disadvantages of this pickling method are: the steel plate continuously reacts with acid liquor, and hydrochloric acid and FeCl are contained in the solution 2 The concentration of the water is changed continuously, which is very easy to causeIn addition to the quality defect of acid washing, the acid liquor can continuously react with the stripped iron scale, and the consumption of the acid liquor is increased.
Disclosure of Invention
The invention aims to provide a pickling tank, namely a pickling method for a hot-rolled steel plate, which cancels a straightening and descaling process before pickling, solves the problem of insufficient pressing force of a straightening and descaling machine during production of high-strength steel, and reduces the damage of a production process to the elongation of a finished steel plate; the invention realizes scale breaking, crack manufacturing, high-pressure acid washing and recovery separation, and continuous four processes, can accurately control acid liquor parameters, improve acid washing speed and reduce acid liquor consumption.
In order to realize the purpose, the technical scheme of the invention is as follows:
the invention provides a hot rolled steel plate pickling tank, wherein a plurality of lower rollers and upper rollers are alternately distributed in the pickling tank along the moving direction of a steel plate, the lower rollers and the upper rollers are used for bending the steel plate, and the steel plate sequentially runs from left to right around the lower rollers and the upper rollers; an upper spray head is arranged at the upper right part of each lower roller, a spray nozzle of the upper spray head faces the lower roller, and the included angle between the spray direction and the vertical direction is 15 degrees; a lower spray head is arranged at the right lower part of each upper roller, a spray nozzle of the lower spray head faces the upper rollers, and an included angle between the spray direction and the vertical direction is 15 degrees; the bottom of the pickling tank is provided with a plurality of acid liquor recovery ports.
Because the upper roller and the lower roller are alternately arranged, the iron scale on the upper surface of the steel plate can also go through the processes of rolling crushing, stretching crack manufacturing and high-pressure acid liquor spraying for many times.
In the above technical solution, further, the vertical distances from the upper nozzle and the lower nozzle to the bent portion of the steel plate are both 120-200 mm.
In the above technical scheme, further, the left and right sides of the upper nozzle are provided with an upper acid liquid suction unit, and the right side of the lower nozzle is provided with a lower acid liquid suction unit.
On the upper surface, an upper acid liquid suction unit is arranged in front of and behind the jet flow, and on the lower surface, a lower acid liquid suction device is arranged only behind the jet flow and is used for quickly sucking the reacted acid liquid and the iron oxide scales into a recovery box for separation so as to prevent the acid liquid and the iron oxide scales from continuously reacting and reduce the consumption of the acid liquid.
In another aspect of the present invention, there is provided a method for pickling a hot rolled steel sheet, the method comprising the steps of:
(1) Uncoiling the coiled steel plate, and feeding the uncoiled steel plate into a pickling tank;
(2) In the pickling process, the pickling tank is utilized, the steel plate is bent and deformed under the action of an upper roller and a lower roller in the pickling tank, and the acid liquor is sprayed out by a spray head and is contacted with iron oxide scales on the upper surface and the lower surface of the steel plate;
(3) And after the pickling is finished, the steel plate is rinsed, dried and oiled, and then is coiled.
When the steel plate is bent under the action of the lower roller, the iron scale on the lower surface is crushed by rolling, and then is bent under the action of the upper roller, the crushed iron scale is subjected to tensile stress, and a large number of micro cracks appear. Spraying out the acid liquor by a spray head, and contacting a part of the acid liquor with iron scale on the surface of the steel plate to perform chemical reaction; the other part of acid liquor is filled into the microcracks at high pressure, so that not only can mechanical stripping and dissolving actions be triggered, but also the high-pressure descaling action can be introduced into the acid liquor obliquely sprayed at high pressure, and therefore, the pickling efficiency and effect are greatly higher than those of soaking type pickling. Because the upper roller and the lower roller are alternately arranged, the iron scale on the upper surface of the steel plate can also go through the processes of rolling crushing, stretching crack manufacturing and high-pressure acid liquor spraying for many times.
In the above technical scheme, further, in the step (2), the concentration of free acid in the acid solution is 110-150 g/L, the concentration of iron ions is 30-70 g/L, the temperature of the acid solution is 70-85 ℃, and the pressure of the acid solution is 20MPa.
In the above technical scheme, further, in the step (2), the acid solution and the iron scale after the reaction are discharged into a waste recovery tank through an acid solution recovery port, and the iron scale is separated from the acid solution.
The pickling process principle of the invention is as follows:
when the steel plate is bent around the lower roller, the iron scale on the lower surface of the steel plate is crushed, the upper surface of the steel plate bears tensile stress, a large number of cracks are formed in the brittle iron scale, and hydrochloric acid solution is sprayed into the cracks along the direction of 15 degrees by the high-pressure spray nozzle, as shown in figure 3. When the steel plate is bent and deformed around the upper roller, the rolled iron scale on the lower surface is easy to crack, and the nozzle below the steel plate sprays acid liquid to a crack area along the direction of 15 degrees.
The pickling process of the invention can lead the acid liquor to be fully contacted with the steel matrix and FeO, not only can initiate mechanical stripping and dissolving action, but also can lead the acid liquor obliquely sprayed by the high-pressure spray head to introduce high-pressure descaling action, thus the pickling efficiency and effect are greatly higher than those of soaking type pickling. In addition, the method only carries out bending deformation on the steel plate without tensile deformation, thereby avoiding the damage of the traditional pickling process to the elongation of the finished steel plate.
The left side and the right side of the upper spray head are provided with the upper acid liquid suction units, and the right side of the lower spray head is provided with the lower acid liquid suction units, so that the functions of the upper acid liquid suction units are as follows: (1) The stripped iron scale, residual acid liquor on the surface of the steel plate and volatilized acid mist can be quickly sucked into solid-liquid separation equipment, so that the hydrochloric acid is prevented from continuously reacting with the stripped iron scale, the consumption of the hydrochloric acid is reduced, and the hydrochloric acid is recovered to the maximum extent; (2) The chemical reaction between the residual acid liquor and the steel plate is prevented, and the surface of the steel plate is prevented from being corroded; (3) And the stripped iron oxide scale is prevented from entering between the next roller and the steel plate, and the surface of the steel plate is damaged.
An acid liquor recovery port is arranged at the bottom of the pickling tank and is used for recovering acid liquor flowing down in front of the nozzle on the lower surface of the steel plate and peeled iron oxide scales.
The invention has the beneficial effects that:
compared with the traditional process, the acid washing process has the following advantages:
because a straightening and descaling machine is cancelled, the floor area of the new equipment is greatly reduced;
(1) A withdrawal straightening and scale breaking machine is not used, so that the requirement of high-strength steel on the equipment pressing capacity is greatly reduced;
(2) The number of the drying rollers is reduced, so that the production and maintenance cost is reduced, and the surface defects of the steel plate caused by the drying rollers can be effectively reduced;
(3) The tensile deformation of the steel plate in the production process is reduced, and the elongation of the final product is improved;
(4) Can accurately control the concentration, the temperature and the FeCl of the acid liquid participating in the chemical reaction 2 Concentration and other key process parameters;
(5) The high-pressure acid liquid is directly injected into cracks of the iron scale, is more fully contacted with the steel plate and the iron scale and has quicker reaction than soaking reaction;
(6) Compared with three mechanisms of traditional soaking and pickling, the method provided by the invention increases a high-pressure descaling effect, can improve pickling efficiency, and can reduce acid liquor consumption;
(7) After the acid liquor is contacted with the iron oxide scale, the hydrochloric acid and the iron oxide scale are immediately recovered and separated, so that the acid liquor and the peeled iron oxide scale are prevented from continuously reacting, and the consumption of the acid liquor is reduced.
Drawings
FIG. 1 is a schematic diagram of a conventional pickling process;
FIG. 2 is a schematic structural view of a pickling tank of the present invention;
in the figure: 1. the lower roller 2, the upper roller 3, the upper spray head 4, the lower spray head 5, the upper acid liquid suction unit 6, the lower acid liquid suction unit 7 and the sprayed acid liquid;
FIG. 3 is a schematic diagram of the pickling process of the present invention.
Detailed Description
The following examples are presented to enable one of ordinary skill in the art to more fully understand the present invention and are not intended to limit the invention in any way.
A pickling tank for a hot rolled steel plate is characterized in that as shown in figure 2, a plurality of lower rollers and upper rollers are alternately distributed in the pickling tank along the moving direction of a steel plate, the lower rollers and the upper rollers are used for bending the steel plate, and the steel plate sequentially runs from left to right around the lower rollers and the upper rollers; an upper spray head is arranged at the upper right part of each lower roller, a spray nozzle of each upper spray head faces the lower roller, and an included angle between the spray direction and the vertical direction is 15 degrees; a lower spray head is arranged at the right lower part of each upper roller, a spray nozzle of the spray head faces the upper rollers, and an included angle between the spray direction and the vertical direction is 15 degrees; the bottom of the pickling tank is provided with a plurality of acid liquor recovery ports; the vertical distance between the upper spray head and the lower spray head and the bent part of the steel plate is 120-200 mm; the left and right sides of the upper spray head are provided with an upper acid liquid suction unit, and the right side of the lower spray head is provided with a lower acid liquid suction unit.
The pickling method by using the pickling tank comprises the following steps:
after uncoiling the hot-rolled steel coil, feeding the hot-rolled steel coil into a pickling tank;
the steel sheet takes place bending deformation many times under the effect of roller and lower roll in the descaling bath, and the shower nozzle spouts acidizing fluid, contacts with the iron scale of steel sheet upper surface and lower surface, acidizing fluid pressure 20MPa, the acidizing fluid composition of injection: the concentration of free acid is 110-150 g/l, the concentration of iron ions is 30-70 g/l, the temperature of acid liquor is 70-85 ℃, the reacted acid liquor and iron scale are discharged into a waste recycling tank through an acid liquor recycling port, and the iron scale is separated from the acid liquor;
and after the pickling is finished, the steel plate is rinsed, dried and oiled, and then is coiled.
Claims (6)
1. A pickling tank for a hot-rolled steel plate is characterized in that a plurality of lower rollers and upper rollers are alternately distributed in the pickling tank along the moving direction of the steel plate, and the steel plate sequentially runs from left to right around the lower rollers and the upper rollers;
an upper spray head is arranged at the upper right part of each lower roller, a spray nozzle of the upper spray head faces the lower roller, and the included angle between the spray direction and the vertical direction is 15 degrees;
a lower spray head is arranged at the lower right side of each upper roller, a spray nozzle of each lower spray head faces the upper rollers, and an included angle between the spray direction and the vertical direction is 15 degrees;
the bottom of the pickling tank is provided with a plurality of acid liquor recovery ports.
2. The pickling tank as claimed in claim 1, wherein the vertical distance between the upper spray head and the lower spray head and the bend of the steel plate is 120-200 mm.
3. The pickling tank as claimed in claim 1, wherein upper acid liquid suction units are provided on the left and right sides of the upper spray head, and lower acid liquid suction units are provided on the right side of the lower spray head.
4. A pickling method for a hot rolled steel plate is characterized by comprising the following steps:
(1) Uncoiling the coiled steel plate, and feeding the uncoiled steel plate into a pickling tank;
(2) The pickling process comprises the steps of using the pickling tank of any one of claims 1 to 3, wherein the steel plate is bent and deformed by the action of the upper roller and the lower roller in the pickling tank, and the acid solution is sprayed by the spray heads to be in contact with the iron oxide scales on the upper surface and the lower surface of the steel plate;
(3) And after the pickling is finished, the steel plate is rinsed, dried and oiled, and then is coiled.
5. The method as claimed in claim 4, wherein in the step (2), the concentration of the free acid in the acid solution is 110-150 g/L, the concentration of iron ions is 30-70 g/L, the temperature of the acid solution is 70-85 ℃, and the pressure of the acid solution is 20MPa.
6. The method as claimed in claim 4, wherein in the step (2), the reacted acid solution and iron oxide scale are discharged into a waste recycling tank through an acid solution recycling port, and the iron oxide scale is separated from the acid solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211313461.5A CN115572978A (en) | 2022-10-25 | 2022-10-25 | Rapid and low-acid-consumption hot rolled steel plate pickling method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211313461.5A CN115572978A (en) | 2022-10-25 | 2022-10-25 | Rapid and low-acid-consumption hot rolled steel plate pickling method |
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| CN115572978A true CN115572978A (en) | 2023-01-06 |
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| CN202211313461.5A Pending CN115572978A (en) | 2022-10-25 | 2022-10-25 | Rapid and low-acid-consumption hot rolled steel plate pickling method |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5472579A (en) * | 1993-09-17 | 1995-12-05 | Hitachi, Ltd. | Hot-rolled steel strip manufacturing and descaling method and apparatus |
| JPH09164416A (en) * | 1995-10-09 | 1997-06-24 | Nisshin Steel Co Ltd | Method and equipment for descaling by rolling |
| JP2001071021A (en) * | 1999-09-01 | 2001-03-21 | Nippon Steel Corp | Equipment for both light rolling reduction and pickling |
| CN1404420A (en) * | 2000-12-27 | 2003-03-19 | Posco公司 | Method and device for manufacturing a hot rolled steel strip |
| KR20040055991A (en) * | 2002-12-23 | 2004-06-30 | 주식회사 포스코 | Method for preventing corrosion of steel strip in the rinsing line |
| KR20040059267A (en) * | 2002-12-28 | 2004-07-05 | 주식회사 포스코 | Method for Removing Oxide Film on the Annealed Hot Rolled Steel Strip for Electrical Steel Sheet, Method and Device for Manufacturing the Annealed Hot Rolled Steel Strip for Electrical Steel Strip |
| CN105170665A (en) * | 2015-08-26 | 2015-12-23 | 武汉钢铁(集团)公司 | Method for removing iron oxide scale from surface of strip steel efficiently |
| CN114054515A (en) * | 2021-06-18 | 2022-02-18 | 德龙钢铁有限公司 | Method for controlling cold rolling base material iron scale after rolling |
-
2022
- 2022-10-25 CN CN202211313461.5A patent/CN115572978A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5472579A (en) * | 1993-09-17 | 1995-12-05 | Hitachi, Ltd. | Hot-rolled steel strip manufacturing and descaling method and apparatus |
| JPH09164416A (en) * | 1995-10-09 | 1997-06-24 | Nisshin Steel Co Ltd | Method and equipment for descaling by rolling |
| JP2001071021A (en) * | 1999-09-01 | 2001-03-21 | Nippon Steel Corp | Equipment for both light rolling reduction and pickling |
| CN1404420A (en) * | 2000-12-27 | 2003-03-19 | Posco公司 | Method and device for manufacturing a hot rolled steel strip |
| KR20040055991A (en) * | 2002-12-23 | 2004-06-30 | 주식회사 포스코 | Method for preventing corrosion of steel strip in the rinsing line |
| KR20040059267A (en) * | 2002-12-28 | 2004-07-05 | 주식회사 포스코 | Method for Removing Oxide Film on the Annealed Hot Rolled Steel Strip for Electrical Steel Sheet, Method and Device for Manufacturing the Annealed Hot Rolled Steel Strip for Electrical Steel Strip |
| CN105170665A (en) * | 2015-08-26 | 2015-12-23 | 武汉钢铁(集团)公司 | Method for removing iron oxide scale from surface of strip steel efficiently |
| CN114054515A (en) * | 2021-06-18 | 2022-02-18 | 德龙钢铁有限公司 | Method for controlling cold rolling base material iron scale after rolling |
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