CN207343455U - Production system is washed in a kind of tandem rolling continuous annealing that can switch more grade stainless strips online - Google Patents
Production system is washed in a kind of tandem rolling continuous annealing that can switch more grade stainless strips online Download PDFInfo
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- CN207343455U CN207343455U CN201720584532.3U CN201720584532U CN207343455U CN 207343455 U CN207343455 U CN 207343455U CN 201720584532 U CN201720584532 U CN 201720584532U CN 207343455 U CN207343455 U CN 207343455U
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Abstract
The utility model provides a kind of tandem rolling continuous annealing that can switch more grade stainless strips online and washes production system, involved in by the raw steel of more grade stainless strips after the production system and then prepare different grades of stainless strip, the production system includes the decoiling equipment set gradually, welder, entry loop, rolling machine system, milling train kink, annealing cooling system, mechanical descaling system, cathodic pickling system, final cleaning and drying unit, outlet looping, planarization system and devices for taking-up, the cathodic pickling system includes being sequentially connected the precleaning unit of setting, sodium sulphate electrolysis unit, sulfuric acid washing device and nitration mixture acid dip pickle.The technical solution of the utility model realizes the band that stainless steel NO.1,2E, 2B, 2D surface grade can be only produced by a production line, and can realize the online production for being switched fast different surfaces grade and unlike material.
Description
Technical field
A kind of stainless steel production system is the utility model is related to, more particularly to a kind of production stainless steel NO.1,2E, 2B, 2D
Production system is washed in the band tandem rolling continuous annealing of surface grade, and in particular to one kind can switch the production more material multi-surfaces of stainless steel online
Production system is washed in the tandem rolling continuous annealing of grade band.
Background technology
At present, stainless steel hot-rolling casting skin band obtains product after the processing of continuous annealing pickling lines, its surface etc.
Level is NO.1；Surface grade is the product of 2E, then is that two racks or three machines are added before common continuous annealing pickling lines
The collateral support stressing device of frame carries out casting skin rolling for 18 cold mills of hydraulic.Downstream cold rolling process is with surface grade NO.1
Or the band of 2E is raw material, after cold continuous rolling or single milling train are rolled, rolling semi-finished product are gone to the special annealing of cold rolling
The finished product of 2B or 2D surface grades is obtained after pickling line processing.The production of above surface grade product is completed, existing process is set
It is standby to be configured with following deficiency：Longer technological process, more device configuration and larger investment, band circulation cycle be long, into
Material rate is relatively low, production unlike material when switch steel grade time-consuming and need that the template thickness for shutting down, produce 2E plate faces is not good enough, produces
The flexibility of line reply turn of the market is not enough, energy consumption is higher, environmentally friendly configuration is not good enough.
It would therefore be highly desirable to propose a kind of stainless steel production system for solving above-mentioned defect in the prior art.
The content of the invention
The purpose of this utility model is to provide a kind of dependable performance, environmental protection, low energy consumption, quality to be guaranteed, can be flexibly
Meet the continuous process system of stainless steel unlike material different surfaces grade band production requirement, to solve to exist in the prior art
Technological process it is complicated, device configuration is more, production cost is high, band circulates, and the cycle is long, lumber recovery is relatively low, when producing unlike material
Switching steel grade, time-consuming and needs the flexibility that the template thickness for shutting down, producing 2E plate faces is not good enough, production line tackles turn of the market
Not enough, energy consumption it is higher, it is environmentally friendly configuration it is not good enough the problems such as defect.
To achieve these goals, the utility model provides following technical solution：
A kind of production system that can switch more grade stainless strips online, by the raw material of more grade stainless strips
Coil of strip enters after the production system and then prepares different grades of stainless strip, and the production system includes setting gradually
Decoiling equipment, welder, entry loop, rolling machine system, milling train kink, annealing cooling system, mechanical descaling system, electrolysis
Pickling system, outlet looping, planarization system and devices for taking-up, the cathodic pickling system include being sequentially connected the prerinse of setting
Device, sodium sulphate electrolysis unit, sulfuric acid washing device and nitration mixture acid dip pickle.
The production system of more grade stainless strips can switched online as described above, be preferably, the rolling machine system
It is made of successively eighteen-high mill device, the first brushing device and the degreasing plant that possesses drying function；Wherein, 18 roller
Rolling mill assembly is arranged on the exit of the entry loop, and the degreasing plant is arranged on the entrance of the milling train kink；Make
The eighteen-high mill device used for collateral support stressing device is 18 roller tandem mills of worm-gear endless-screw type.
The production system of more grade stainless strips can switched online as described above, be preferably, the mechanical descaling
System includes being sequentially connected the descaling mill, drying unit and shot-blasting machine of setting；Wherein, it is cold to be arranged on the annealing for the descaling mill
But the exit of system, the shot-blasting machine are arranged on the entrance of the cathodic pickling system；The descaling mill is wet type scale breading
Machine, the lower descaling rolls of the wet type descaling mill are fixed and are added without adjusting mechanism, working roll and support roller using material GCr15
Work, hardening depth is up to 4~5mm.
The production system of more grade stainless strips can switched online as described above, be preferably, the decoiling equipment
To possess the big stroke harmomegathus uncoiler of recycling packing paper function；The welder is the Laser Welding for possessing laser cutting function
Machine；Final cleaning and drying unit are additionally provided between the cathodic pickling system and the outlet looping；The smooth system
System includes the planisher, smooth small kink, monitor station for being sequentially connected setting；The devices for taking-up is the volume for possessing cushioning paper function
Take device.
The production system of more grade stainless strips can switched online as described above, be preferably, in the sodium sulphate
The exit of electrolysis unit, the sulfuric acid washing device and the nitration mixture acid dip pickle is respectively arranged with the second brushing device,
Three brushing devices and the 4th brushing device；Wherein, the precleaning unit is arranged on the exit of the mechanical descaling system, institute
State the entrance that the 4th brushing device is arranged on the outlet looping.
The production system of more grade stainless strips can switched online as described above, be preferably, the sodium sulphate electricity
Solution device is made of the sulfuric acid natrium electrolytic cell, sodium sulphate circulating tank and sodium sulphate regenerating unit for being sequentially connected setting；Wherein, it is described
Second brushing device is arranged on the exit of the sulfuric acid natrium electrolytic cell；Circular electrolyte enters out of described sodium sulphate circulating tank
In the sodium sulphate regenerating unit, the regenerated liquid produced through the sodium sulphate regenerating unit is back to the sodium sulphate circulating tank
Interior, the crystal produced through the sodium sulphate regenerating unit is transported to sintering circuit and is recycled, the sodium sulphate
The electrolyte circulated between circulating tank and the sulfuric acid natrium electrolytic cell is the sodium sulphate circulated, easy to the stainless steel band
The electrolytic cleaned of material.
The production system of more grade stainless strips can switched online as described above, be preferably, the sulfuric acid washing
Device includes the sulfuric acid washing groove, sulfuric acid circulating tank and on-line filtration device for being sequentially connected setting；Wherein, the 3rd scrub dress
Put the exit for being arranged on the sulfuric acid washing groove；The on-line filtration device is equipment for separating liquid from solid；Sulfuric acid circulation fluid is from institute
State in sulfuric acid circulating tank and enter in the equipment for separating liquid from solid, the filtrate isolated through the equipment for separating liquid from solid is back to described
In sulfuric acid circulating tank, the filter cake isolated through the equipment for separating liquid from solid is transported to sintering circuit and is recycled, described
Circulation fluid between sulfuric acid circulating tank and the sulfuric acid washing groove is the sulfuric acid circulated, easy to the stainless strip
Chemical cleaning.
The production system of more grade stainless strips can switched online as described above, be preferably, the nitration mixture pickling
Device includes the nitration mixture descaling bath, nitration mixture circulating tank and on-line filtration device for being sequentially connected setting；Wherein, the 4th scrub dress
Put the exit for being arranged on the nitration mixture descaling bath；The on-line filtration device is equipment for separating liquid from solid；Nitration mixture circulation fluid is from institute
State in nitration mixture circulating tank and enter in the equipment for separating liquid from solid, the filtrate isolated through the equipment for separating liquid from solid is back to described
In nitration mixture circulating tank, the filter cake isolated through the equipment for separating liquid from solid is transported to sintering circuit and is recycled, described
Circulation fluid between nitration mixture circulating tank and the nitration mixture descaling bath is the mixed acid circulated, easy to the stainless strip
Chemical cleaning.
The production system of more grade stainless strips can switched online as described above, be preferably, further include：Waste mixed acid
Tank, waste mixed acid regenerative system and regenerated acid tank；Waste mixed acid enters in the waste mixed acid tank out of described nitration mixture circulating tank, then through pipe
Road is delivered to the waste mixed acid regenerative system, and the regenerated acid produced through the waste mixed acid regenerative system is delivered to the regenerated acid
Need add in the nitration mixture circulating tank according to technique in tank, the iron powder quilt produced through the waste mixed acid regenerative system
Collection is transitted to sintering circuit and is recycled.
The production system of more grade stainless strips can switched online as described above, be preferably, each nitration mixture section is matched somebody with somebody
There are two circulating tanks, two sets of heat exchangers, two circuits systems to be connected with acid tank, be easy to implement being switched fast for steel grade.
The production system of more grade stainless strips can switched online as described above, be preferably, more grades are not
Rust steel band is the stainless steel finished product that surface grade is NO.1,2B, 2D or 2E.
Compared with the immediate prior art, technical solution provided by the utility model has following excellent effect：
1st, the technical solution of the utility model realize only by a production line can produce stainless steel NO.1,2E,
The band of 2B, 2D surface grade, and can realize the online production for being switched fast different surfaces grade and unlike material.
2nd, the utility model is using big stroke harmomegathus uncoiler (band recycling packing paper function), it is not necessary to additionally configures diameter increasing sleeve
Cylinder increases footpath block, and compared to more general uncoiler, its fluctuation applicability to hot-rolled black-skin supplied materials internal diameter is stronger, and production returns to volume
Shi Buxu tears diameter increasing sleeve cylinder open or increases footpath block.
3rd, the utility model uses solid disc-type using laser cutting and laser welding technology, lasing light emitter, and steel band is end to end
Each configuration laser cutting is cut, and weld line and unit cross central line are had certain angle partially, with argon arc welding machine or general sharp
Welding machine is compared, this kind of technical solution can solve the problems, such as slab shearing difficulty and blade chipping, ensure welding quality, smooth welded seam
Smooth, physical property meets rolling requirements, is not required to lift roller (temporarily stopping rolling) and crosses weld seam, directly roller welding can stitch and be not required to drop rolling
Tension force before and after power or drop, weld seam is partially angled to make weld seam spirally be contacted with working roll in rolling, greatly reduces weld seam and breaks
Band risk, adapts to the weld seam rolling of more material multi-surface class requirements and greatly improves the lumber recovery of various products.
4th, the utility model uses the eighteen-high mill that collateral support stressing device is arranged for three rack of worm-gear endless-screw type, its side
Support stress can be resisted up to 100 tons.Compared to other tandem mills, the technical solution of the utility model can be adapted for multi-surface etc.
The production of level, and template is more preferable and tolerance smaller, maximum can roll 1550mm wide * 8.0mm thickness, casting skin maximum depression rate is reachable
50%, white skin maximum depression rate is up to 60%, it can be achieved that not stopping to roll online roll change.
5th, the utility model is designed with two sets of emulsion systems, and different emulsification can be selected according to different plate face class requirements
Liquid and different configuration concentrations, filtering are combined using Magnetic filtration device and vacuum filter.
6th, the utility model is equipped with brushing device in milling train outlet, can switch unlike material according to different surfaces class requirement
Bristle, can effectively remove plate face soil or loose scale, provide convenient for follow-up surface treatment and save and rinse
Use water.
7th, the utility model uses wet type descaling mill, effectively inhibits iron scale dust, can reduce belt steel surface to a certain degree
Wipe and scratch.Its structure uses lower descaling rolls to be fixed, and no adjusting mechanism is easy to operation, and on-site maintenance amount is small；Working roll and branch
Support roller to process using material GCr15, hardening depth is up to 4~5mm, it is allowed to which working roll and support roller repeatedly grind Reusability.
8th, the utility model uses is configured with sodium sulphate electrolysis unit and sulfuric acid washing device, it can be achieved that producing at the same time
The sodium sulphate that comes into operation when 2B, 2D surface is electrolysed, and come into operation sulfuric acid washing when producing NO.1 or 2E surfaces, can also come into operation at the same time as place
Manage the oxidation skin depth defect of raw material casting skin.
The utility model carries out on-line filtration using solid-liquid separation technique to the acid solution in sour circulating tank, and it is heavy to greatly reduce
Starch accumulation, improve acid solution activity, extend pickling duty cycle, reduce acid solution discharge, and the filter cake moisture content formed is low, can be just
In the recycling of sintering circuit；Meanwhile pretreatment of the technology as waste mixed acid spray roasting regeneration techniques, greatly reduce
The risk of roaster knot wall.
The utility model realizes the regeneration of nitric acid and hydrofluoric acid in waste mixed acid with waste mixed acid spray roasting regeneration techniques,
Metal ion in waste mixed acid is recycled in the form of oxide (powdery), acid consumption is greatly reduced and mitigates neutralisation treatment
Load, beneficial to the recycling of noble metal, remarkable in economical benefits.
The utility model uses selective catalytic reduction handling to nitration mixture exhaust gas, and the catalyst of its core uses
The rare-earth type low temperature catalyst of environmental protection, reducing agent use ammonium hydroxide, urea are used compared with than general vanadium Titanium series catalyst and reducing agent
Solution, its energy consumption is low, catalyst surface does not tend to have urea crystals or dust stratification, and catalytic effect stablizes service life length, catalyst
It is not dangerous discarded object after scrapping.
The nitration mixture acid dip pickle that the utility model uses has two sets of independent acid circulation can system, it is possible to achieve different steel grades
It is switched fast online.
9th, planisher provided by the utility model, reduction ratio meet the requirement of 2B/2D plate faces, while can change up to 10%
The roughness of kind NO.1 plate faces.
Brief description of the drawings
The accompanying drawings which form a part of this application are used to provide a further understanding of the present invention, this practicality
New schematic description and description is used to explain the utility model, does not form the improper restriction to the utility model.
Wherein：
Fig. 1 is the tandem rolling that can switch the production more material multi-surface grade bands of stainless steel online of the utility model embodiment
Production system schematic diagram is washed in continuous annealing；
Fig. 2 is the rolling machine system schematic diagram in Fig. 1；
Fig. 3 is the annealing cooling system schematic diagram in Fig. 1；
Fig. 4 is the mechanical descaling system schematic in Fig. 1；
Fig. 5 is the cathodic pickling system schematic in Fig. 1；
Fig. 6 is the planarization system schematic diagram in Fig. 1.
Embodiment
The utility model will be described in detail below with reference to the accompanying drawings and embodiments.It should be noted that do not conflicting
In the case of, the feature in embodiment and embodiment in the application can be mutually combined.
In the description of the utility model, term " longitudinal direction ", " transverse direction ", " on ", " under ", "front", "rear", "left", "right",
The orientation or position relationship of the instruction such as " vertical ", " level ", " top ", " bottom " be based on orientation shown in the drawings or position relationship,
It is for only for ease of description the utility model rather than requires the utility model must be with specific azimuth configuration and operation, therefore
It is not intended that the limitation to the utility model.The term " connected " that is used in the utility model, " connection " should be interpreted broadly,
For example, it may be it is fixedly connected or is detachably connected；It can be directly connected, can also be indirect by intermediate member
It is connected, for the ordinary skill in the art, can understands the concrete meaning of above-mentioned term as the case may be.
As shown in figs 1 to 6, the utility model provides a kind of production system that can switch more grade stainless strips online,
Involved in by the raw steel of more grade stainless strips after production system and then prepare different grades of stainless strip, produced
System include set gradually decoiling equipment, welder, entry loop, rolling machine system, milling train kink, annealing cooling system,
Mechanical descaling system, cathodic pickling system, outlet looping, planarization system and devices for taking-up, cathodic pickling system include connecting successively
Connect precleaning unit, sodium sulphate electrolysis unit, sulfuric acid washing device and the nitration mixture acid dip pickle of setting.
In the utility model embodiment, the different brackets stainless strip prepared refer to surface grade for NO.1,2B,
The stainless steel finished product of 2D or 2E.The utility model can realize only by a production line can produce stainless steel NO.1,2E,
The band of 2B, 2D surface grade, and can realize the production of online switching different surfaces grade and unlike material.
In the utility model embodiment, rolling machine system by eighteen-high mill device, the first brushing device and possesses successively
The degreasing plant composition of drying function；Wherein, eighteen-high mill device is arranged on the exit of entry loop, and degreasing plant is set
In the entrance of milling train kink.
In the utility model embodiment, the eighteen-high mill device used as collateral support stressing device is worm and gear
18 roller tandem mills of type.The utility model uses collateral support stressing device as worm-gear endless-screw type eighteen-high mill, its collateral support
Stress can be resisted up to 100 tons, arranged using three racks.Compared to other tandem mills (eighteen-high mill of such as cylinder type), sheet
Technical solution can be adapted for the production of multi-surface grade, and the template produced is more preferable and tolerance smaller, maximum can roll
1550mm wide * 8.0mm thickness, casting skin maximum depression rate is up to 50%, and white skin maximum depression rate is up to 60%, it can be achieved that changing online
Roller does not stop to roll.
In the utility model embodiment, the first brushing device is arranged on the exit position of collateral support rolling mill assembly, can
Switch the bristle of unlike material according to different surfaces class requirement, plate face soil or loose scale are effectively removed, after being
Continuous surface treatment provides convenient and saving rinse water.Preferably, the bristle of the first brushing device can use PPH or carbonization
Silicon.
The utility model is designed with two sets of emulsion systems, and different emulsions can be selected according to different plate face class requirements
With different configuration concentrations, filtering is combined using Magnetic filtration device and vacuum filter.
In the utility model embodiment, mechanical descaling system include being sequentially connected the descaling mill of setting, drying unit and
Shot-blasting machine；Wherein, descaling mill is arranged on the exit of annealing cooling system, and shot-blasting machine is arranged on the import of cathodic pickling system
Place；Descaling mill is wet type descaling mill, and the lower descaling rolls of wet type descaling mill are fixed and without adjusting mechanism, working roll and support roller
Processed using material GCr15, hardening depth is up to 4~5mm.
The factor that the type selecting of the wet type descaling mill of the utility model is considered is as follows：
1) harmful effect of the dry type descaling mill to surrounding environment is directed to, is sprayed using wet type descaling mill, and using three tunnels
Moisture safety pin effectively inhibits iron scale dust, while can reduce to a certain degree to scale breading roller surface, belt steel surface and equipment groove body
Belt steel surface, which is wiped, to be scratched.
2) lower descaling rolls are used as fixed structure, without adjusting mechanism, for spraying water environment, service life of equipment will be big
Big enhancing.
3) the problem of wet type descaling mill working roll service life is short is directed to, it is special that the sealing of working roll supporting roller bearing is carried out
Design, under the adverse circumstances of iron scale muddy water mixing, it is ensured that the sufficient lubrication of working roll and supporting roller bearing, ensures working
Roller will not be replaced in the support roller work period because of bearing problem, reach the service life of dry type descaling mill working roll, together
The working environment of Shi Gaishan descaling mills.
4) working roll and support roller are processed using material GCr15, and hardening depth is up to 4~5mm, it is allowed to working roll support roller
Multiple grinding roller Reusability.
In the utility model embodiment, decoiling equipment is the big stroke harmomegathus uncoiler for possessing recycling packing paper function；Weldering
Tipping is set to the laser welder for possessing laser cutting function；It is additionally provided between cathodic pickling system and outlet looping final clear
Wash and drying unit；Planarization system includes the planisher, smooth small kink, monitor station for being sequentially connected setting；Devices for taking-up is tool
The devices for taking-up of standby cushioning paper function.
In the utility model embodiment, decoiling equipment is big stroke harmomegathus uncoiler (packing paper function is torn in band selection open), no
Need additionally to configure diameter increasing sleeve cylinder or increase footpath block, compared to general uncoiler, its fluctuation to hot-rolled black-skin supplied materials internal diameter is applicable in
Property it is stronger, production is not required to tear open diameter increasing sleeve cylinder or increases footpath block when returning to volume, dismountable recycling packing paper.
In the utility model embodiment, welder is the laser welder for possessing laser cutting function；Laser welder
Lasing light emitter is solid disc-type, is respectively configured with laser cutting in the cut place end to end of stainless strip, and set weld line and machine
Deviation has certain angle between group cross central line.Compared with argon arc welding machine or general laser welder, this kind of technical solution energy
Solve the problems, such as slab shearing difficulty and blade chipping, ensure welding quality, smooth welded seam is smooth, physical property meets that rolling is wanted
Ask, be not required to lift roller (temporarily stop rolling) and cross weld seam, can tension force before and after directly roller welding stitches and is not required to rolling force reduction or drops, weld seam has partially
Angle can be such that weld seam is spirally contacted with working roll in rolling, greatly reduce weld seam broken belt risk, adapt to more material multi-surfaces
The weld seam rolling of class requirement and the lumber recovery for greatly improving various products.
In the utility model embodiment, annealing cooling system is made of annealing furnace and three-level cooling system, three-level cooling
System is arranged on the exit of annealing furnace.Three-level cooling system is by being sequentially connected the air cooling device, mist device for cooling and water cooling of setting
Device forms.Annealing furnace is arranged on milling train kink exit, and water cooling plant is arranged on the entrance of mechanical descaling system.
In the utility model embodiment, in going out for sodium sulphate electrolysis unit, sulfuric acid washing device and nitration mixture acid dip pickle
The second brushing device, the 3rd brushing device and the 4th brushing device are respectively arranged with mouthful；Wherein, precleaning unit is arranged on machine
The exit of tool descaling system, the 4th brushing device are arranged on the entrance of outlet looping.
In the utility model embodiment, sodium sulphate electrolysis unit is by being sequentially connected sulfuric acid natrium electrolytic cell, the sulfuric acid of setting
Sodium circulating tank and sodium sulphate regenerating unit composition；Wherein, the second brushing device is arranged on the exit of sulfuric acid natrium electrolytic cell；Circulation
Electrolyte enters in sodium sulphate regenerating unit out of sodium sulphate circulating tank, the regenerated liquid reflux produced through sodium sulphate regenerating unit
To sodium sulphate circulating tank, the crystal produced through sodium sulphate regenerating unit is transported to sintering circuit and is recycled,
The electrolyte circulated between sodium sulphate circulating tank and sulfuric acid natrium electrolytic cell is the sodium sulphate circulated, easy to stainless strip
Electrolytic cleaned.
In the utility model embodiment, sulfuric acid washing groove, sulfuric acid that sulfuric acid washing device includes being sequentially connected setting follow
Ring tank and on-line filtration device；Wherein, the 3rd brushing device is arranged on the exit of sulfuric acid washing groove；On-line filtration device is solid
Liquid separating apparatus；Sulfuric acid circulation fluid enters in equipment for separating liquid from solid out of sulfuric acid circulating tank, is isolated through equipment for separating liquid from solid
Filtrate is back in sulfuric acid circulating tank, and the filter cake isolated through equipment for separating liquid from solid is transported to sintering circuit and carries out at recycling
Reason, the circulation fluid between sulfuric acid circulating tank and sulfuric acid washing groove is the sulfuric acid circulated, easy to the chemistry to stainless strip
Cleaning.
In the utility model embodiment, nitration mixture descaling bath, nitration mixture that nitration mixture acid dip pickle includes being sequentially connected setting follow
Ring tank and on-line filtration device；Wherein, the 4th brushing device is arranged on the exit of nitration mixture descaling bath；On-line filtration device is solid
Liquid separating apparatus；Nitration mixture circulation fluid enters in equipment for separating liquid from solid out of nitration mixture circulating tank, is isolated through equipment for separating liquid from solid
Filtrate is back in nitration mixture circulating tank, and the filter cake isolated through equipment for separating liquid from solid is transported to sintering circuit and carries out at recycling
Reason, the circulation fluid between nitration mixture circulating tank and nitration mixture descaling bath is the mixed acid circulated, easy to the change to stainless strip
Learn cleaning.Preferably, the mixed acid is nitric acid and the mixed liquor of hydrofluoric acid.
, can be real using sodium sulphate electrolysis unit and sulfuric acid washing device is configured with the same time in the utility model embodiment
Come into operation sodium sulphate electrolysis during production 2B, 2D surface now, and come into operation sulfuric acid washing when producing NO.1 or 2E surfaces, can also make at the same time
It is used as the oxidation skin depth defect of processing raw material casting skin.
In the utility model embodiment, further preferably further include：Waste mixed acid tank, waste mixed acid regenerative system and regenerated acid
Tank；Waste mixed acid enters in waste mixed acid tank out of nitration mixture circulating tank, then through pipeline to waste mixed acid regenerative system, through waste mixed acid again
The regenerated acid that raw system production goes out is delivered in regenerated acid tank to be needed add in nitration mixture circulating tank according to technique, through useless mixed
The iron powder that acid purification system is produced, which is collected, to be transitted to sintering circuit and is recycled.
In the utility model embodiment, using separation of solid and liquid (two fractionation technique of solid-liquid) to the acid solution in sour circulating tank
On-line filtration is carried out, precipitate bulk can be greatly reduced, acid solution activity is improved, extend pickling duty cycle, reduce acid solution discharge,
The filter cake moisture content formed is low, can be easy to the recycling of sintering circuit；Meanwhile the technology as waste mixed acid spray roasting again
The pretreatment of raw technology, greatly reduces the risk of roaster knot wall.
In the utility model embodiment, nitric acid and hydrogen in waste mixed acid are realized with waste mixed acid spray roasting regeneration techniques
The regeneration of fluoric acid, recycles the metal ion in waste mixed acid in the form of oxide (powdery), greatly reduce acid consumption and
The load of neutralisation treatment is alleviated, beneficial to the recycling of noble metal.
Further preferably, each nitration mixture section connects equipped with two circulating tanks, two sets of heat exchangers, two circuits systems and acid tank
Connect, be easy to implement being switched fast for steel grade.In the utility model embodiment, the nitration mixture acid dip pickle of design have two sets it is independent
Acid circulation can system, it is possible to achieve different steel grades are switched fast online.
In the utility model embodiment, using SCR denitration technology handling to nitration mixture exhaust gas, the catalysis of its core
Agent is used ammonium hydroxide, is adopted compared with than general vanadium Titanium series catalyst and reducing agent using environmentally friendly rare-earth type low temperature catalyst, reducing agent
With urea liquid, its energy consumption is low, catalyst surface does not tend to have urea crystals or dust stratification, and catalytic effect stablizes service life length,
It is not dangerous discarded object after scrapping.
In the utility model embodiment, entry loop, milling train kink, outlet looping, the small kink of planisher are both preferably
Horizontal type kink.
In the utility model embodiment, drying unit is additionally provided between cathodic pickling system and outlet looping；It is flat
Whole system includes being sequentially connected the planisher, smooth small kink, monitor station of setting.Planisher is two rollers or four-roller planisher.It is excellent
Selection of land, the planisher are four-roller planisher, and reduction ratio meets the requirement of 2B/2D plate faces, while can improve NO.1 up to 10%
The roughness of plate face.
In order to more specifically understand the production system of the utility model embodiment, following productions by the utility model
The operating method of system is described in detail, and particular content is as follows：
The production system raw material of the utility model can make choice according to finished surface class requirement, if finished product is NO.1
Or 2E surfaces, then raw material is hot-rolled black-skin；If finished product is 2B, 2D surface, then ingredient requirement is NO.1 surfaces.
Raw material coil of strip enters production line by decoiling equipment, is taken the lead by laser cutting to what the magnetic tape trailer of preceding volume was rolled up with after
Laser welding is carried out after carrying out the high-precision shearing with drift angle.
Strip enters tandem mill by entry loop, needs to choose whether to roll according to surface grade.When production NO.1 tables
During the grade of face, milling train does not come into operation；When producing 2E, 2B, 2D surface grade, put into milling train and needed to select pressure according to thickness
Distribution, maximum can roll 1550mm wide * 8.0mm thickness, and for casting skin maximum depression rate up to 50%, white skin maximum depression rate is reachable
60%, it can be achieved that do not stop to roll online roll change.It is to be noted that：The system is designed with two emulsion systems, is respectively suitable for
2E, 2B/2D surface grade.
After strip has gone out tandem mill, into the first brushing device, enter after removing plate face soil or loose scale
Degreasing plant (drying).It is pointed out that degreasing plant only drying function comes into operation when tandem mill does not come into operation, degreasing work(
It can not come into operation.
Strip, which goes out after degreasing plant enters milling train kink, enters annealing furnace, and solutionizing processing is carried out in annealing furnace, goes out to move back
Cooled down after stove using three-level, i.e., it is air-cooled, mist is cold, water cooling.
After strip goes out annealing furnace cooling section, wet type descaling mill is entered after squeeze roller squeezes out pan section water.There is water
The lower progress two curved one of spray is rectified, and is made the oxide layer on strip in flexure stress and is drawn to descend to crush and drop, shower water takes away iron powder
And carry out separation of solid and liquid recycling iron powder and shower water is recycled.
Strip, which goes out after descaling mill carries out drying surface into drying unit, enters shot-blasting machine, it is pointed out that：Work as production
Finished product need the shot-blasting machine that comes into operation when being NO.1/2E, shot-blasting machine does not come into operation when the finished product of production is 2B/2D.
Strip enters the remaining abrasive material (ball blast material) that precleaning unit removes surface after going out shot-blasting machine, then passes sequentially through sulphur
Sour natrium electrolytic cell, the second brushing device, sulfuric acid washing groove, the 3rd brushing device, nitration mixture descaling bath, the 4th brushing device.Each groove
Corresponding circulating tank is provided with, wherein equipped with sodium sulphate regenerating unit, the crystal filtered out send sintering circuit to recycle.
Sulfuric acid circulating tank and nitration mixture circulating tank are furnished with on-line filtration device, you can circulation fluid is taken out from circulating tank and is filled into separation of solid and liquid
Put, filtrate stays back circulating tank, and the filter cake filtered out is transported to sintering circuit and is recycled.Waste mixed acid is sent after entering waste acid pot
Handled to waste mixed acid regenerative system, the rate of recovery 40%-50% of nitric acid, the rate of recovery of hydrofluoric acid is more than 98%, formation
Regenerated acid is sent to regenerated acid tank and is added according to technological requirement into the use of nitration mixture circulating tank, the iron powder (metal such as chromium, nickel, iron of formation
Oxide) send sintering circuit to recycle.It is to be noted that：1) when the finished product of production is NO.1/2E, generally only come into operation sulphur
Pickling can increase the sodium sulphate electrolysis that comes into operation without the sodium sulphate electrolysis that comes into operation when raw material oxide skin is thicker；But production
When finished product is 2B/2D, for ensure surface grade can only come into operation sodium sulphate electrolysis, it is impossible to come into operation sulfuric acid washing.2) each nitration mixture groove
Equipped with two sets of circulatory systems (nitration mixture circulating tank, heat exchanger, pump etc.), a set of is that production 300 comes into operation when being, a set of for production 200
Come into operation when being, online concentration switching can be realized according to raw material material.3) nitration mixture descaling bath and the circulatory system to match therewith
Have multiple, according to plate face situation and cross come into operation quantity and concentration of tape speed selection and select.
Then strip sequentially enters outlet looping, puts down by scrubbing and entering drying unit drying plate face after final cleaning
Complete machine, smooth small kink, monitor station, are finally rolled into coil of strip through devices for taking-up.It is to be noted that：1) planisher can be according to need
Two rollers or four-roller are used, when the finished product of production is NO.1/2E, is not come into operation generally；When the finished product of production is 2B/2D, then
Need to come into operation and reduction ratio is adjusted according to surface grade.2) when the finished product of production is 2B/2D, the devices for taking-up that need to come into operation is subsidiary
Packing paper function.
The above is only the preferred embodiment of the present invention, is not intended to limit the present invention, for this area
Technical staff for, various modifications and changes may be made to the present invention.Where within the spirit and principles of the present invention,
Any modification, equivalent replacement, improvement and so on, should be included within the scope of protection of this utility model.
Claims (9)
1. production system is washed in a kind of tandem rolling continuous annealing that can switch more grade stainless strips online, the production system is included successively
The decoiling equipment of setting, welder, entry loop, rolling machine system, milling train kink, annealing cooling system, mechanical descaling system,
Cathodic pickling system, outlet looping, planarization system and devices for taking-up, it is characterised in that the cathodic pickling system is included successively
Connect precleaning unit, sodium sulphate electrolysis unit, sulfuric acid washing device and the nitration mixture acid dip pickle set.
2. production system is washed in the tandem rolling continuous annealing that can switch more grade stainless strips online as claimed in claim 1, its feature
It is, the rolling machine system is successively by eighteen-high mill device, the first brushing device and the degreasing plant group for possessing drying function
Into；
Wherein, the eighteen-high mill device is arranged on the exit of the entry loop, and the degreasing plant is arranged on described
The entrance of milling train kink；The eighteen-high mill device used as collateral support stressing device is the 18 of worm-gear endless-screw type
Roller tandem mill.
3. production system is washed in the tandem rolling continuous annealing that can switch more grade stainless strips online as claimed in claim 1, its feature
It is, the mechanical descaling system includes being sequentially connected the descaling mill, drying unit and shot-blasting machine of setting；
Wherein, the descaling mill is arranged on the exit of the annealing cooling system, and the shot-blasting machine is arranged on the electrolysis acid
Wash the entrance of system；The descaling mill is wet type descaling mill, and the lower descaling rolls of the wet type descaling mill are fixed and without tune
Save mechanism, working roll and support roller to process using material GCr15, hardening depth is up to 4~5mm.
4. production system is washed in the tandem rolling continuous annealing that can switch more grade stainless strips online as claimed in claim 1, its feature
It is, the decoiling equipment is the big stroke harmomegathus uncoiler for possessing recycling packing paper function；The welder is to possess laser
The laser welder of cutting function；
Final cleaning and drying unit are additionally provided between the cathodic pickling system and the outlet looping；
The planarization system includes the planisher, smooth small kink, monitor station for being sequentially connected setting；
The devices for taking-up is the devices for taking-up for possessing cushioning paper function.
5. production system is washed in the tandem rolling continuous annealing that can switch more grade stainless strips online as claimed in claim 1, its feature
It is, is set respectively in the exit of the sodium sulphate electrolysis unit, the sulfuric acid washing device and the nitration mixture acid dip pickle
There are the second brushing device, the 3rd brushing device and the 4th brushing device；
Wherein, the precleaning unit is arranged on the exit of the mechanical descaling system, and the 4th brushing device is arranged on
The entrance of the outlet looping.
6. production system is washed in the tandem rolling continuous annealing that can switch more grade stainless strips online as claimed in claim 5, its feature
It is, the sodium sulphate electrolysis unit is regenerated by the sulfuric acid natrium electrolytic cell, sodium sulphate circulating tank and sodium sulphate for being sequentially connected setting
Device forms；
Wherein, second brushing device is arranged on the exit of the sulfuric acid natrium electrolytic cell.
7. production system is washed in the tandem rolling continuous annealing that can switch more grade stainless strips online as claimed in claim 5, its feature
It is, the sulfuric acid washing device includes the sulfuric acid washing groove, sulfuric acid circulating tank and on-line filtration device for being sequentially connected setting；
Wherein, the 3rd brushing device is arranged on the exit of the sulfuric acid washing groove；
The on-line filtration device is equipment for separating liquid from solid.
8. production system is washed in the tandem rolling continuous annealing that can switch more grade stainless strips online as claimed in claim 5, its feature
It is, the nitration mixture acid dip pickle includes the nitration mixture descaling bath, nitration mixture circulating tank and on-line filtration device for being sequentially connected setting；
Wherein, the 4th brushing device is arranged on the exit of the nitration mixture descaling bath；
The on-line filtration device is equipment for separating liquid from solid.
9. production system is washed in the tandem rolling continuous annealing that can switch more grade stainless strips online as claimed in claim 8, its feature
It is, further includes：Waste mixed acid tank, waste mixed acid regenerative system and regenerated acid tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720584532.3U CN207343455U (en) | 2017-05-24 | 2017-05-24 | Production system is washed in a kind of tandem rolling continuous annealing that can switch more grade stainless strips online |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720584532.3U CN207343455U (en) | 2017-05-24 | 2017-05-24 | Production system is washed in a kind of tandem rolling continuous annealing that can switch more grade stainless strips online |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107042239A (en) * | 2017-05-24 | 2017-08-15 | 北海诚德镍业有限公司 | Production system is washed in a kind of tandem rolling continuous annealing that can switch many grade stainless strips online |
| WO2020232935A1 (en) * | 2019-05-20 | 2020-11-26 | 中冶南方工程技术有限公司 | High-efficiency cleaning device and method for stainless steel |
| CN113302006A (en) * | 2019-01-28 | 2021-08-24 | 奥托库姆普联合股份公司 | Method for producing stainless steel strip |
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2017
- 2017-05-24 CN CN201720584532.3U patent/CN207343455U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107042239A (en) * | 2017-05-24 | 2017-08-15 | 北海诚德镍业有限公司 | Production system is washed in a kind of tandem rolling continuous annealing that can switch many grade stainless strips online |
| CN107042239B (en) * | 2017-05-24 | 2020-08-11 | 广西北部湾新材料有限公司 | Continuous rolling continuous annealing and washing production system capable of switching multi-grade stainless steel strips on line |
| CN113302006A (en) * | 2019-01-28 | 2021-08-24 | 奥托库姆普联合股份公司 | Method for producing stainless steel strip |
| EP3917693A4 (en) * | 2019-01-28 | 2022-10-26 | Outokumpu Oyj | Method for manufacturing of stainless steel strips |
| WO2020232935A1 (en) * | 2019-05-20 | 2020-11-26 | 中冶南方工程技术有限公司 | High-efficiency cleaning device and method for stainless steel |
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