CN111621794A

CN111621794A - Steel surface pickling processing system

Info

Publication number: CN111621794A
Application number: CN202010623695.4A
Authority: CN
Inventors: 徐小锋
Original assignee: Jiangsu Changhong Frp Co ltd
Current assignee: Jiangsu Changhong Frp Co ltd
Priority date: 2020-06-30
Filing date: 2020-06-30
Publication date: 2020-09-04

Abstract

The utility model relates to a steel surface pickling processing system belongs to steel surface treatment field, and it includes that new acid tank, acidizing fluid heater and upper end that connect gradually through the pipeline are equipped with open-ended steel descaling bath, still includes circulation hot acid tank and filters the jar, the acidizing fluid export of steel descaling bath with the import of filtering the jar links to each other, be equipped with filtering piece in the filtration jar, the export of filtering the jar with the import of circulation hot acid tank links to each other, the export of circulation hot acid tank with pipeline between new acid tank, the acidizing fluid heater links to each other. The acid liquor in the acid washing treatment system can be recycled at constant temperature, and equipment used in three processes of acid washing, alkali washing and water washing of steel is integrated, so that the effects of high efficiency and energy conservation are achieved.

Description

Steel surface pickling processing system

Technical Field

The application relates to the technical field of steel surface treatment, in particular to a steel surface pickling treatment system.

Background

The sulfur print test is a method for detecting the surface quality of steel products, and can display central cracks, segregation lines, low-power structures, inclusion distribution and the like of steel ingots and continuous casting billets. The steel is required to be acid-washed before the sulfur mark test, the acid-washing is one of the most common methods for cleaning the metal surface, and the acid-washing solution generally comprises hydrochloric acid, sulfuric acid, phosphoric acid, hydrofluoric acid and other solutions.

The acid pickling system for the steel sulfur mark test in the related technology comprises a new acid tank, an acid liquid heater and a steel pickling tank, wherein the acid liquid in the new acid tank is heated by the acid liquid heater and then is introduced into the steel pickling tank, and the steel is placed in the steel pickling tank so as to realize the acid pickling purpose. After pickling, because the acid liquor in the steel pickling tank is directly discharged into the waste acid tank, the method easily causes great waste of acid liquor resources.

Disclosure of Invention

In order to solve the problem of great resource waste of acid liquor in the related art, the application provides a steel surface pickling treatment system.

The above application purpose of the present application is achieved by the following technical solutions:

the utility model provides a steel surface pickling processing system, includes that the new acid tank, acidizing fluid heater and the upper end that connect gradually through the pipeline are equipped with open-ended steel descaling bath, still includes circulation hot acid tank and filters the jar, the acidizing fluid export of steel descaling bath with the import of filtering the jar links to each other, be equipped with in the filtration jar and filter the piece, the export of filtering the jar with the import of circulation hot acid tank links to each other, the export of circulation hot acid tank with pipeline between new acid tank, the acidizing fluid heater links to each other.

By adopting the technical scheme, the acid liquor in the new acid tank is heated by the acid liquor heater and enters the steel pickling tank, and the new acid tank stops supplying acid to the acid liquor heater when the acid pickling dosage is reached. The steel pickling tank is used for pickling the steel, acid liquor can be discharged into the circulating hot acid tank after the pickling is finished, then the circulating hot acid tank is discharged into the acid liquor heater for heating, and the acid liquor is discharged into the steel pickling tank again for pickling the steel, so that the acid liquor is effectively recycled, and resources are saved. The new acid tank can supplement acid to the circulating hot acid tank, acid liquor in the circulating hot acid tank is regularly and intensively discharged after being used for many times, and the new acid tank supplies acid to the acid liquor heater again after being discharged, so that the acid cleaning of the steel can be continued.

Preferably, the steel descaling bath lateral wall is connected with into acid line and acid discharge pipe, the steel descaling bath inside wall encircles and is provided with the shower, evenly be provided with a plurality of spray nozzles on the shower, the import intercommunication of shower is provided with into alkali pipe and inlet tube, the steel descaling bath lateral wall is connected with the waste liquid discharge pipe.

By adopting the technical scheme, after the steel is placed in the steel pickling tank, the processes of pickling, alkali washing and water washing can be directly and sequentially carried out in the steel pickling tank, only one tank body is used in the three processes, the occupied space is small, and meanwhile, other special equipment for carrying out inter-process operation on the steel is not required to be additionally arranged.

Preferably, the side wall of the spray pipe is connected with a liquid inlet pipe of which one end penetrates out of the side wall of the steel pickling tank, one end of the liquid inlet pipe is connected with a three-way joint, and the alkali inlet pipe and the water inlet pipe are communicated with the three-way joint.

By adopting the technical scheme, the alkali inlet pipe, the water inlet pipe and the spray pipe are connected by utilizing the three-way joint, so that the pipeline arrangement can be simplified.

Preferably, still include alkali lye storage tank and clear water storage tank, advance alkali pipe and alkali lye storage tank intercommunication, inlet tube and clear water storage tank intercommunication, alkali lye storage tank sets up with the laminating of clear water storage tank.

Through adopting above-mentioned technical scheme, can be used to contain hot water in the clear water storage tank, utilize hot water can preheat the alkali lye that holds in the alkali lye storage tank, can make alkali lye better with the acidizing fluid neutralization effect when spraying through the shower, also reduced simultaneously and additionally used the resource that heating equipment carries out the heating to alkali lye to occupy.

Preferably, a connecting port is arranged on the top wall of the circulating hot acid tank, and the outlet of the filter tank is connected with the connecting port in a flange mode.

Through adopting above-mentioned technical scheme, filter tank can practice thrift installation space with the integrative installation of circulation hot acid jar.

Preferably, the acid liquor heater is a silicon carbide heater.

By adopting the technical scheme, the silicon carbide heat exchanger is a novel heat exchanger which utilizes a silicon carbide ceramic material as a heat transfer medium. Because the silicon carbide ceramic has the excellent characteristics of high strength, high hardness, good wear resistance, high temperature resistance, corrosion resistance, good thermal shock resistance, large heat conductivity coefficient, good oxidation resistance and the like, the silicon carbide ceramic is suitable for the use requirements of high-temperature and corrosion-resistant environments. And air-cooling from 1000 ℃ to room temperature, and no crack appears after repeating for more than 50 times; the heat conductivity coefficient is equal to that of stainless steel, the overall heat transfer efficiency is high, and the energy-saving effect is obvious.

Preferably, the steel descaling bath top is equipped with the ring canal that induced drafts, induced draft the ring canal and keep away from the lateral wall at steel descaling bath center and seted up the main mouth that induced drafts, induced draft the ring canal and seted up a plurality of rows towards the lateral wall at steel descaling bath center and induced draft the branch mouth, induced draft the branch mouth edge the circumference setting of the ring canal that induced drafts.

By adopting the technical scheme, when the air suction main port is communicated with other air suction equipment, the acid mist formed above the steel pickling tank can be sucked into the air suction ring pipe through the air suction branch port and can be discharged after being purified outwards by the air suction equipment, so that the pollution of the acid mist to the environment is reduced.

Preferably, the ring canal roof fixedly connected with installation frid and the symmetry that induced drafts set up slide the frid, be formed with the space of sliding of intercommunication between installation frid, the frid that slides and the ring canal that induced drafts, the space that slides is connected with and seals steel descaling bath upper end open-ended apron, the relative both sides and the frid laminating that slides of apron.

By adopting the technical scheme, the cover plate can further reduce the outward dispersion of acid mist in the steel pickling tank, and the cover plate is more convenient to open by adopting a translation operation mode.

Preferably, a plurality of balls are embedded in the top wall of the air suction ring pipe along the sliding direction of the cover plate in an array mode, and one side, facing the steel pickling tank, of the cover plate rolls relative to the balls.

Through adopting above-mentioned technical scheme, the ball is used for becoming rolling friction with the sliding friction in apron and the space that slides, can effectively reduce frictional force, is convenient for promote and open the apron.

In summary, the present application includes at least one of the following beneficial technical effects:

1. through the arrangement of the circulating hot acid tank and the filtering tank, the acid liquor for steel acid washing can be recycled, and the effects of saving resources and reducing cost are achieved;

2. through the arrangement of the spray pipe, the alkali inlet pipe and the water inlet pipe, the steel bath pickling tank can simultaneously meet the working condition requirements of steel acid washing, alkali washing and water washing, the operation is convenient, and the occupied area is saved;

3. through the setting of the ring canal that induced drafts, can in time absorb the produced acid mist of steel pickling in-process, the apron can cooperate the ring canal that induced drafts to further absorb the acid mist simultaneously, also makes external object be difficult for directly dropping to the steel descaling bath.

Drawings

FIG. 1 is a schematic view of the overall process for embodying a steel surface pickling treatment system in the embodiment of the present application;

FIG. 2 is a schematic diagram of the overall structure of the steel pickling tank and the air suction ring pipe when the installation is completed in the embodiment of the application;

FIG. 3 is a schematic view of an embodiment of the present application for showing a steel pickling tank and its internal structure separately;

fig. 4 is a schematic structural diagram for embodying the sliding connection of the cover plate and the suction ring pipe in the embodiment of the present application.

Description of reference numerals: 1. a steel pickling tank; 11. an upper working area; 111. an acid inlet pipe; 112. an acid discharge pipe; 113. an alkali inlet pipe; 114. a water inlet pipe; 115. a waste liquid discharge pipe; 116. an overflow pipe; 117. a support plate; 118. clamping the tube; 12. a lower isolation region; 13. flanging; 2. a shower pipe; 21. a spray nozzle; 22. positioning the metal hose; 24. a liquid inlet pipe; 241. a three-way joint; 3. an air suction ring pipe; 31. a main air suction port; 32. air suction and port division; 33. installing a groove plate; 34. a sliding groove plate; 35. a ball bearing; 4. a cover plate; 5. placing a tray; 51. a stirring blade; 52. rotating the tube; 6. a drive assembly; 61. a drive motor; 62. a bevel gear; 63. a helical gear; 7. a rotary joint; 71. a heat source inlet pipe; 72. a heat source outlet pipe; 8. a partition plate; 9. a fresh acid tank; 10. an acid liquor heater; 14. a circulating hot acid tank; 141. a connecting port; 15. a filter tank; 151. a filter screen; 152. an access door; 16. a lye storage tank; 17. clear water storage tank.

Detailed Description

The present application is described in further detail below with reference to the attached drawings.

The steel surface pickling treatment system disclosed in the embodiment of the application, as shown in fig. 1, includes a new acid tank 9, an acid liquid heater 10, a steel pickling tank 1, a filter tank 15, and a circulating hot acid tank 14. The fresh acid tank 9, the acid liquid heater 10 and the steel pickling tank 1 are communicated through pipelines, a connecting port 141 is arranged on the top wall of the circulating hot acid tank 14, the filtering tank 15 is positioned above the circulating hot acid tank 14, and the outlet of the filtering tank 15 is in flange connection with the connecting port 141.

The fresh acid tank 9 stores fresh acid, the fresh acid is pumped to the acid liquor heater 10 through a pipeline to be heated, the heated acid liquor is pumped to the steel acid washing tank 1 through the pipeline, and the fresh acid tank 9 stops supplying acid to the acid liquor heater 10 when the acid washing dosage is reached. The acid liquor heater 10 may be a graphite heater or a silicon carbide heater, and in this embodiment, a silicon carbide heater with high heat transfer efficiency and good energy-saving effect is preferred, so that the activation degree of internal molecules of the acid liquor can be increased after the acid liquor is heated, and the efficiency of subsequent steel acid washing is improved.

Acid liquor in the steel pickling tank 1 is pumped into a filtering tank 15 through a pipeline after being used, a filtering piece is arranged in the filtering tank 15, impurities in the acid liquor are filtered by the filtering piece and then enter a circulating hot acid tank 14, and the acid liquor in the circulating hot acid tank 14 is pumped into an acid liquor heater 10 through the pipeline, so that the cyclic utilization of the acid liquor is realized. The acid liquor in the circulating hot acid tank 14 is replenished by the new acid tank 9, and is completely discharged from the circulating hot acid tank 14 after being recycled for a certain number of times.

The filtering member is horizontally or obliquely arranged on a filtering net 151 on the inner side wall of the filtering tank 15, and an access door 152 is arranged on the side wall of the filtering tank 15 and below the filtering net 151. Filter screen 151 adopts the mode of slope installation in this embodiment, opens the back when access door 152, and impurity on the filter screen 151 can receive the dead weight to gather in the least significant end of filter screen 151 to made things convenient for and cleared up impurity.

As shown in figure 2, the steel pickling tank 1 is provided with an opening at the upper end, a flange 13 is integrally formed outwards at the opening, and an air suction ring pipe 3 for absorbing acid mist is erected on the flange 13. A horizontally arranged clapboard 8 is fixedly connected in the steel pickling tank 1, and the clapboard 8 divides the steel pickling tank 1 into an upper working area 11 and a lower isolation area 12. A rotating pipe 52 is rotatably connected at the center of the partition plate 8, and a dynamic sealing structure is arranged between the rotating pipe 52 and the partition plate 8; one end of the rotating pipe 52 is positioned in the upper working area 11 and is fixedly connected with a placing disc 5 for placing steel to be subjected to a sulfur mark test, the other end of the rotating pipe 52 is positioned in the lower isolation area 12, and a driving assembly 6 for driving the rotating pipe 52 to rotate is arranged in the lower isolation area 12.

As shown in fig. 2, the driving assembly 6 includes a driving motor 61, a bevel gear 63 and a bevel gear 62, the driving motor 61 is fixedly installed in the lower isolation area 12, the bevel gear 63 is coaxially fixed with an output shaft of the driving motor 61, the bevel gear 62 is fixedly installed outside the rotating tube 52, and the bevel gear 63 and the bevel gear 62 are in meshing transmission to enable the rotating tube 52 and the object placing disk 5 to rotate synchronously.

As shown in fig. 2, the side wall of the tray 5 is further fixedly connected with obliquely arranged stirring blades 51 along the circumferential direction, the inner parts of the stirring blades and the inner part of the tray are hollow and are communicated with each other, the inner part of the rotating tube 52 is divided into an inner flow passage and a return flow passage, and the inner flow passage and the outer flow passage are both communicated with the tray 5. One end of the rotating pipe 52 far away from the object placing disc 5 is connected with a rotating joint 7, a heat source inlet pipe 71 and a heat source outlet pipe 72 are connected to the rotating joint 7, the heat source inlet pipe 71 is communicated with the inner flow channel, the heat source outlet pipe 72 is communicated with the return flow channel, and the heat source inlet pipe 71 and the heat source outlet pipe 72 both penetrate through the side wall of the lower isolation area 12.

As shown in fig. 2, the side wall of the upper working area 11 is connected to an acid inlet pipe 111, the acid inlet pipe 111 is a bent pipe, and one end of the bent pipe is connected to the outlet of the acid heater 10, and the other end extends to the partition plate 8. When acid liquor is injected into the upper working area 11 through the acid inlet pipe 111, a heat source with sufficient pressure is injected into the inner flow passage of the rotating pipe 52 through the heat source inlet pipe 71 and is filled into the object placing disc 5 and the stirring blades 51, and at the moment, air in the object placing disc 5 and the stirring blades 51 can be completely discharged from the heat source outlet pipe 72. The heat source is discharged from the heat source outlet pipe 72 through the return passage of the rotating pipe 52 to heat the whole acid solution, thereby effectively compensating the temperature drop of the acid solution, maintaining the activation degree of molecules in the acid solution and reducing the time for pickling the steel. Meanwhile, the placing disc 5 can rotate together with the steel in the acid liquor, so that the effective contact degree of the steel and the acid liquor is increased, and the reaction efficiency of acid washing of the steel is further improved. The stirring blades 51 are rotated and obliquely arranged, so that the flowing of the acid liquor can be accelerated, the heating time of the acid liquor is shortened, and the heating temperature is more uniform.

In the specific implementation process, the heat source can be water, oil or steam, and the inclination direction of the stirring blade 51 is consistent with the rotation direction of the object placing disc 5, so that the disturbed acid liquid is quickly stirred to the steel. An acid-resistant thermocouple can be arranged in the upper working area 11 for detecting the temperature of acid liquid in the upper working area, if the temperature is lower than the set temperature, a heat source is introduced into the rotating pipe 52 for heating, and when the temperature is higher than the set temperature, the heating is stopped, so that the steel is kept at the constant temperature for pickling.

As shown in FIGS. 2 and 3, an overflow pipe 116 is connected to the side wall of the upper working area 11, the overflow pipe 116 is opened near the upper end of the steel pickling tank 1, and the overflow pipe 116 is connected to an external acid storage tank (not shown). The partition plate 8 is also connected with an acid discharge pipe 112 and a waste liquid discharge pipe 115, one end of the acid discharge pipe 112 and one end of the waste liquid discharge pipe 115, which are far away from the partition plate 8, penetrate through the side wall of the lower isolation region 12, and the acid discharge pipe 112 is communicated with an inlet of the filter tank 15.

As shown in fig. 3, the inner side wall of the upper working area 11 is fixedly connected with a clamping pipe 118 and a support plate 117 which are arranged up and down, a spray pipe 2 surrounding the inner side wall of the upper working area 11 is clamped between the clamping pipe 118 and the support plate 117, and a plurality of spray nozzles 21 are uniformly arranged on the spray pipe 2. The spraying pipe 2 is communicated with a liquid inlet pipe 24, one end of the liquid inlet pipe 24 penetrates through the side wall of the upper working area 11, one end of the liquid inlet pipe 24, which is far away from the spraying pipe 2, is connected with a three-way joint 241, and the other two joints of the three-way joint 241 are respectively connected with an alkali inlet pipe 113 and an alkali inlet pipe 114. The alkali inlet pipe 113 is connected with an alkali storage tank 16, the water inlet pipe 114 is connected with a clear water storage tank 17, hot water is stored in the clear water storage tank 17, or heating devices such as heating wires are arranged in the clear water storage tank 17 to heat cold water, the heat of the clear water storage tank 17 can be used for preheating alkali liquid in the alkali storage tank 16, and the effect is better when the alkali liquid is neutralized with acid liquid. In the specific implementation process, the steel is placed on the placing plate 5, acid liquor is injected through the acid inlet pipe 111 until the steel is completely submerged, the acid liquor is discharged from the acid discharge pipe 112 after being soaked for a period of time, the spraying pipe 2 firstly sprays the alkali liquor to neutralize the acid liquor on the surface of the steel, and then sprays clear water to clean the steel.

As shown in fig. 3, because the shape and length of the steel are different, the surface of the steel soaked in the acid solution is easily unable to be effectively cleaned by the alkali solution and the clean water, so the spray nozzle 21 is connected with the spray pipe 2 by the positioning metal hose 22, and the positioning metal hose 22 can be self-shaped after being bent and deformed, so as to freely adjust the spray direction of the spray nozzle 21 according to different steel, so that the end of the spray nozzle 21 far away from the spray pipe 2 can be inclined towards the steel, and further the surface of the steel can be cleaned to the maximum extent.

As shown in fig. 4, a plurality of rows of uniformly distributed air suction branch openings 32 are formed in the side wall of the air suction ring pipe 3 facing the center of the steel pickling tank 1, any two adjacent rows of air suction branch openings 32 are staggered with each other, and an air suction main opening 31 (see fig. 2) is formed in one side wall of the air suction ring pipe 3 far away from the center of the steel pickling tank 1. Induced draft 3 roof fixedly connected with of ring canal 3 along the centre line symmetry of its width direction set up the frid 34 that slides, induced draft ring canal 3's roof still fixedly connected with installation frid 33, installation frid 33 all is L shape with the frid 34 section that slides, installation frid 33 communicates with two same one end of the frid 34 that slides simultaneously, and the two with induced draft be formed with between the ring canal 3 each other intercommunication and one end open-ended space of sliding, it is connected with apron 4 to slide in the space of sliding. The top wall of the air suction ring pipe 3 is also embedded with a plurality of balls 35 which are used for reducing the sliding friction between the air suction ring pipe and the cover plate 4 in an array manner along the sliding direction of the cover plate 4.

When carrying out the sulphur seal experiment, promote apron 4 to with installation frid 33 butt, apron 4 can seal steel descaling bath 1 upper end opening completely, the main mouth 31 accessible flange that induced drafts this moment links to each other with external equipment (not shown in the figure) that induced drafts, induced drafts equipment and can be handled through the acid mist suction that produces in the steel descaling bath 1 after starting, acid mist accessible acid-base method absorption box. In order to reduce the resistance when the acid mist enters the air suction ring pipe 3, a flow guide inclined plane is further arranged on one side of the air suction branch opening 32 close to the bottom of the steel pickling tank 1 and inclines towards the bottom of the steel pickling tank 1. The flow guide inclined plane can reduce the flow path of the acid mist, so that the acid mist can enter the air suction ring pipe 3 more smoothly and quickly.

The implementation principle of the embodiment is as follows:

firstly, steel is hoisted to a placing plate 5, the orientation of a spray nozzle 21 is adjusted according to the shape and the size of the steel, a cover plate 4 is pushed to seal a steel pickling tank 1, meanwhile, an air suction main port 31 of an air suction ring pipe 3 is communicated with external air suction equipment, fresh acid enters the steel pickling tank 1 after being heated by an acid liquor heater 10, and when the steel is completely immersed by the acid liquor, a fresh acid tank 9 stops supplying acid to the acid liquor heater 10.

And secondly, starting the driving motor 61, automatically judging whether a heat source is introduced into the rotary joint 7 or not according to the thermocouple temperature and a background program, pickling the steel, wherein the pickling duration of the steel is 20-30min, discharging the acid liquor into the filtering tank 15 through the acid discharge pipe 112 after the pickling is finished, and storing the acid liquor in the circulating hot acid tank 14 after the acid liquor is filtered.

And thirdly, opening the alkali inlet pipe 113 and the waste liquid discharge pipe 115, spraying the steel by the alkali liquor through the spraying nozzle 21 for alkali washing, wherein the spraying time lasts for 2-3min, and discharging the waste alkali liquor from the waste liquid discharge pipe 115.

Fourthly, the alkali inlet pipe 113 is closed, the water inlet pipe 114 is opened, clean water is sprayed to the steel by the spray nozzle 21 for washing, the spraying time lasts for 2-3min, and waste water is also discharged from the waste liquid discharge pipe 115.

And step five, closing the air suction equipment, opening the cover plate 4 to take out the steel, and finishing the acid, alkali and water washing processes.

If other steel products need to be treated, the acid liquor in the circulating hot acid tank 14 is introduced into the acid liquor heater 10 to be heated and enters the steel product pickling tank 1, and the two to five steps are repeated. The acid liquor in the circulating hot acid tank 14 can be replenished by the new acid tank 9, and according to the judgment of the experience of workers, when the acid liquor in the circulating hot acid tank 14 is recycled for a certain number of times and cannot be used, the acid liquor is completely discharged from the interior of the circulating hot acid tank, and then the new acid tank 9 supplies acid to the steel pickling tank 1.

The embodiments of the present invention are preferred embodiments of the present application, and the scope of protection of the present application is not limited by the embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a steel surface pickling processing system, includes that new acid tank (9), acidizing fluid heater (10) and upper end that connect gradually through the pipeline are equipped with open-ended steel descaling bath (1), its characterized in that: still include circulation hot acid jar (14) and filter tank (15), the acidizing fluid export of steel descaling bath (1) with the import of filtering tank (15) links to each other, be equipped with in filtering tank (15) and filter, the export of filtering tank (15) with the import of circulation hot acid jar (14) links to each other, the export of circulation hot acid jar (14) with pipeline between new acid tank (9), acidizing fluid heater (10) links to each other.

2. The steel product surface pickling treatment system according to claim 1, wherein: the side wall of the steel pickling tank (1) is connected with an acid inlet pipe (111) and an acid outlet pipe (112), the inner side wall of the steel pickling tank (1) is surrounded by a spray pipe (2), a plurality of spray nozzles (21) are evenly arranged on the spray pipe (2), an inlet of the spray pipe (2) is communicated with an alkali inlet pipe (113) and a water inlet pipe (114), and the side wall of the steel pickling tank (1) is connected with a waste liquid discharge pipe (115).

3. The steel product surface pickling treatment system according to claim 2, wherein: the side wall of the spray pipe (2) is connected with a liquid inlet pipe (24) with one end penetrating out of the side wall of the steel pickling tank (1), one end of the liquid inlet pipe (24) is connected with a three-way joint (241), and the alkali inlet pipe (113) and the water inlet pipe (114) are communicated with the three-way joint (17).

4. The steel product surface pickling treatment system according to claim 3, wherein: still include alkali lye storage tank (16) and clear water storage tank (17), advance alkali pipe (113) and alkali lye storage tank (16) intercommunication, inlet tube (114) and clear water storage tank (17) intercommunication, alkali lye storage tank (16) and clear water storage tank (17) laminating setting.

5. The steel product surface pickling treatment system according to claim 1, wherein: a connecting port (141) is arranged on the top wall of the circulating hot acid tank (14), and the outlet of the filtering tank (15) is connected with the connecting port (141) in a flange mode.

6. The steel product surface pickling treatment system according to claim 1, wherein: the acid liquor heater (10) is a silicon carbide heater.

7. The steel product surface pickling treatment system according to claim 1, wherein: steel descaling bath (1) top is equipped with the ring canal (3) of induced drafting, induced draft ring canal (3) are kept away from the lateral wall at steel descaling bath (1) center and have been seted up induced draft main entrance (31), induced draft ring canal (3) have been seted up towards the lateral wall at steel descaling bath (1) center and have been induced drafted a plurality of rows and divide mouth (32), induced draft divide mouth (32) to follow the circumference setting of ring canal (3) of induced drafting.

8. The steel product surface pickling treatment system according to claim 7, wherein: induced draft ring canal (3) roof fixedly connected with installation frid (33) and the symmetrical frid (34) that slides that sets up, installation frid (33), frid (34) that slides and induced draft are formed with the space of sliding of intercommunication between ring canal (3), slide and move in the space of sliding and be connected with and seal open-ended apron (4) in steel pickling tank (1), the relative both sides and the frid (34) laminating of sliding of apron (4).

9. The steel product surface pickling treatment system of claim 8, wherein: the top wall of the air suction ring pipe (3) is embedded with a plurality of balls (35) along the sliding direction of the cover plate (4), and one side of the cover plate (4) facing the steel pickling tank (1) rolls relative to the balls (35).