CN210796636U - Pickling equipment for stainless steel band - Google Patents
Pickling equipment for stainless steel band Download PDFInfo
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- CN210796636U CN210796636U CN201822272434.3U CN201822272434U CN210796636U CN 210796636 U CN210796636 U CN 210796636U CN 201822272434 U CN201822272434 U CN 201822272434U CN 210796636 U CN210796636 U CN 210796636U
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Abstract
The utility model discloses pickling equipment for stainless steel bands, which comprises a first electrolytic tank for carrying out electrolytic treatment on the stainless steel bands; a first pickling tank connected with the first electrolytic tank and used for carrying out primary pickling treatment on the stainless steel belt; a second pickling tank which is connected with the first pickling tank and is used for carrying out secondary pickling treatment on the stainless steel band; a third pickling tank which is connected with the second pickling tank and is used for carrying out pickling treatment on the stainless steel band for the third time; rinsing equipment which is connected with the third pickling tank and used for rinsing the stainless steel band; and the drying equipment is connected with the rinsing equipment and used for drying the stainless steel band. Adopt the utility model discloses, can adjust the volume of wasting discharge of acid according to the stainless steel band of different speeds or thickness, reach a balance between the consumption of metal ion and the consumption of acid to reduce sour emission, realize energy saving and emission reduction.
Description
Technical Field
The utility model relates to a stainless steel technical field especially relates to a pickling installation of stainless steel band.
Background
The stainless steel band is an extension of the ultrathin stainless steel plate, is a narrow and long steel plate produced by meeting the requirements of different industrial departments for industrially producing various types of metal or mechanical products, is widely applied to high-technology industry, IT industry and aviation and aerospace industry, and has high added value.
Scale or oxide layers may form on the strip surfaces during rolling and annealing of stainless and acid resistant alloy steels. The scale layer is composed of ferrochrome oxide, iron oxide and oxides of other alloying elements. Their mixing ratio is determined by the steel composition, annealing conditions (temperature, heating period and atmosphere) and other parameters.
Most of the metal oxides in the scaly layer exist in the form of spinel, and are extremely difficult to dissolve in acid. Moreover, in some cases a chromium-free band of a certain composition and thickness is formed under the scale layer. In order to ensure the properties of the strip surface, the chromium content of the surface must be consistent with that in the strip. The scale layer and the chrome-free strip are removed from the strip surface by multistage pickling in various solutions.
Most of the existing pickling processes simply set pickling conditions, and acid emission can be involved in the pickling process, so that energy conservation and emission reduction are not facilitated. Chinese patent publication No. CN 106244783B discloses "a continuous production method of stainless steel strip steel", which includes the steps of cold rolling, annealing, derusting, leveling, etc., wherein the derusting treatment is performed on the annealed strip steel, and the three stages are: and (3) a pulling, straightening and scale breaking stage: the strip steel passes through a pulling, straightening and scale breaking machine, so that the strip steel has 1.2% of elongation, and oxide skin on the surface of the strip steel is broken and peeled off; an electrolysis stage: immersing the band steel after being pulled, corrected and descaled in neutral salt sodium sulfate electrolyte, wherein the electrolysis temperature is 80 ℃, the concentration of sodium sulfate is 220g/L, the pH value is 5.5, and the electrolysis time is 30 s; acid pickling and passivation stage: and immersing the electrolyzed strip steel in a mixed solution of nitric acid and hydrofluoric acid for pickling, wherein the concentration of the nitric acid is 150g/L, the concentration of the hydrofluoric acid is 30g/L, the pickling temperature is 58 ℃, and removing the oxidized rusty scale on the surface of the strip steel.
In the above pickling conditions, the stainless steel belts with different speeds or thicknesses are liable to fluctuate in acid concentration, and a balance between the consumption of metal ions and the consumption of acid cannot be achieved, resulting in a large acid discharge amount in the pickling process.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is to provide a pickling equipment of stainless steel band, can reduce acid emission, realize energy saving and emission reduction.
The technical problem to be solved by the utility model is to provide a pickling device for stainless steel bands, which consumes less heat energy.
In order to solve the above problem, the utility model provides a pair of pickling installation of stainless steel band, include:
a first electrolytic tank for electrolyzing the stainless steel strip, wherein the medium of the first electrolytic tank is Na2SO4A solution;
a first pickling tank connected with the first electrolytic tank and used for carrying out primary pickling treatment on the stainless steel strip, wherein the medium of the first pickling tank is HNO3And HF, wherein the first pickling tank is provided with a first feeding mechanism and a first waste discharge mechanism, and the first feeding mechanism injects a preset amount of HNO3And HF, the first exhaust mechanism exhausting a preset amount of HNO3And HF, so that the medium of the first pickling tank flows in a circulating manner;
a second pickling tank connected with the first pickling tank and used for carrying out secondary pickling treatment on the stainless steel strip, wherein the medium of the second pickling tank is HNO3And HF, the second acid washing tank is provided with a second feeding mechanism and a second waste discharge mechanism, and the second feeding mechanism injects preset amount of HNO3And HF, the second waste discharge mechanism discharges a preset amount of HNO3And HF, so as to circulate the medium of the second acid washing tank;
a third pickling tank connected with the second pickling tank and used for carrying out third pickling treatment on the stainless steel strip, wherein the medium of the third pickling tank is HNO3And HF, wherein the third pickling tank is provided with a third feeding mechanism and a third waste discharge mechanism, and the third feeding mechanism is injected with HNO with preset amount3And HF, the third exhaust mechanism discharging a preset amount of HNO3And HF, so that the medium of the third pickling tank flows in a circulating manner;
rinsing equipment which is connected with the third pickling tank and used for rinsing the stainless steel band;
the drying equipment is connected with the rinsing equipment and used for drying the stainless steel band;
and the first pickling tank, the second pickling tank and the third pickling tank are respectively provided with a thickness detector for detecting the thickness d of the stainless steel strip, a width detector for detecting the width a of the stainless steel strip and a speed detector for detecting the speed v of the stainless steel strip.
As a modification of the above, Na in the first electrolytic cell2SO4The concentration of the solution is less than 200g/L, the concentration of metal ions is less than 15g/L, the temperature is 75-85 ℃, and the current density is 0-20A/dm2The concentration of hexavalent chromium is less than 5g/L, and the content of suspended matters is less than 4 g/L;
HNO of the first pickling tank3The concentration of the metal ions is 80-150g/L, the concentration of HF is 3-40g/L, the concentration of the metal ions is less than 35g/L, and the temperature is 40-65 ℃;
HNO of the second acid wash tank3The concentration of the metal ions is 80-150g/L, the concentration of HF is 3-40g/L, the concentration of the metal ions is less than 35g/L, and the temperature is 40-65 ℃;
HNO of the third pickling tank3The concentration of the metal ions is 80-150g/L, the concentration of HF is 3-40g/L, the concentration of the metal ions is less than 35g/L, and the temperature is 40-65 ℃.
As a modification of the above, Na in the first electrolytic cell2SO4Concentration of the solution150-200g/L, the concentration of metal ions is less than 15g/L, the temperature is 75-85 ℃, the current density is 5-10A/dm2, the concentration of hexavalent chromium is 0.5-1.5g/L, and the content of suspended matters is less than 4 g/L;
HNO of the first pickling tank3The concentration of the metal ion is 100-130g/L, the concentration of HF is 10-40g/L, the concentration of the metal ion is less than 25g/L, and the temperature is 45-60 ℃;
HNO of the second acid wash tank3The concentration of the metal ion is 100-130g/L, the concentration of HF is 10-40g/L, the concentration of the metal ion is less than 25g/L, and the temperature is 45-60 ℃;
HNO of the third pickling tank3The concentration of the metal ion is 100-130g/L, the concentration of HF is 10-40g/L, the concentration of the metal ion is less than 25g/L, and the temperature is 45-60 ℃.
As an improvement of the scheme, the thickness of the stainless steel belt is 0.3-3mm, and the transmission speed is 100-200 m/min.
As an improvement of the scheme, the rinsing equipment comprises a first spraying rinsing tank, a second spraying rinsing tank, a double-brush machine, a third spraying rinsing tank and a thermal spraying rinsing tank, wherein the first spraying rinsing tank, the second spraying rinsing tank, the double-brush machine, the third spraying rinsing tank and the thermal spraying rinsing tank are sequentially connected.
As an improvement of the scheme, the thermal spraying rinsing tank is provided with a steam ejector, and the temperature of rinsing water is less than 95 ℃.
As an improvement of the above scheme, the first electrolytic cell is connected with a first waste gas treatment system for recycling the first waste gas discharged after the electrolysis treatment;
the first waste gas treatment system comprises a fan, a deep spraying area, a liquid drop separator and a demister, waste gas generated by electrolysis treatment and sodium sulfate regeneration is guided to the deep spraying area through the fan, the first waste gas in the deep spraying area is contacted with a washing solution, liquid drop separation is realized through the liquid drop separator and the demister, and the washing solution in the deep spraying area is desalted water.
As an improvement of the above scheme, the first pickling tank, the second pickling tank and the third pickling tank are connected with the second waste gas treatment system, and are used for recovering and treating the second waste gas discharged after pickling treatment;
the second waste gas treatment system comprises a hydrofluoric acid washing tower and a denitrification device, acid components in the second waste gas are removed through the hydrofluoric acid washing tower until the acid components are reduced to a limit value, and then the nitrogen oxides are reduced through the denitrification device.
Implement the utility model discloses, following beneficial effect has:
(1) the utility model provides a pair of pickling equipment of stainless steel band can obtain the real-time volume of steel band in the pickling medium according to the speed and the thickness of stainless steel band, then adjusts in real time to the volume of wasting discharge, reaches a balance between the consumption of metal ion and sour consumption to reduce sour emission, reduce power consumption simultaneously, realize energy saving and emission reduction.
(2) The utility model can also use the HNO of the first pickling tank, the second pickling tank and the third pickling tank according to the waste discharge amount3And HF are added in an amount adjusted to efficiently remove the scale layer and the chrome-free belt.
(3) The utility model discloses first electrolysis trough is connected with first exhaust treatment system, can carry out recovery processing to the first waste gas of electrolysis processing back discharge, and in addition, first descaling bath, second pickling bath, third pickling bath are connected with second exhaust treatment system for carry out recovery processing to the exhaust second waste gas after the pickling processing, effectively carry out recovery processing, energy saving and emission reduction to the emission of pickling in-process.
Drawings
FIG. 1 is a schematic structural diagram of the pickling apparatus for stainless steel strip of the present invention.
Fig. 2 is a schematic structural view of the rinsing apparatus of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below.
Scale or oxide layers may form on the strip surface during stainless steel rolling and annealing. The scale layer is composed of ferrochrome oxide, iron oxide and oxides of other alloying elements. Their mixing ratio is determined by the steel composition, annealing conditions (temperature, heating period and atmosphere) and other parameters. The stainless steel strip after annealing carries out pickling through pickling equipment and is specifically as shown in figure 1, the utility model provides a pair of stainless steel strip's pickling equipment, include:
a first electrolytic tank 1 for electrolyzing the stainless steel strip, wherein the medium of the first electrolytic tank 1 is Na2SO4A solution;
a first pickling tank 2 connected with the first electrolytic tank 1 and used for carrying out primary pickling treatment on the stainless steel strip, wherein the medium of the first pickling tank 2 is HNO3And HF, the first pickling tank 2 is provided with a first feeding mechanism 21 and a first waste discharging mechanism 22, and the first feeding mechanism 21 injects a preset amount of HNO3And HF, the first exhaust mechanism 22 exhausting a preset amount of HNO3And HF, so that the medium of the first pickling tank flows in a circulating manner;
a second pickling tank 3 connected with the first pickling tank 2 and used for carrying out secondary pickling treatment on the stainless steel strip, wherein the medium of the second pickling tank 3 is HNO3And HF, the second acid washing tank 3 is provided with a second feeding mechanism 31 and a second waste discharge mechanism 32, and the second feeding mechanism 31 injects a preset amount of HNO3And HF, the second exhaust mechanism 32 discharging a preset amount of HNO3And HF, so as to circulate the medium of the second acid washing tank;
a third pickling tank 4 connected with the second pickling tank 3 and used for carrying out third pickling treatment on the stainless steel strip, wherein the medium of the third pickling tank 4 is HNO3And HF, the third pickling tank 4 is provided with a third feeding mechanism 41 and a third waste discharge mechanism 42, and the third feeding mechanism 41 is injected with a preset amount of HNO3And HF, the third exhaust mechanism 42 discharging a preset amount of HNO3And HF, so that the medium of the third pickling tank flows in a circulating manner;
a rinsing device 5 connected with the third pickling tank 4 for rinsing the stainless steel band;
a drying device 6 connected with the rinsing device 5 for drying the stainless steel band;
wherein the medium of the first electrolytic tank 1 is Na2SO4Solution, Na2SO4The concentration of the solution is less than 200g/L, the concentration of metal ions is less than 15g/L, the temperature is 75-85 ℃, and the current density is 0-20A/dm2The concentration of hexavalent chromium is less than 5g/L, and the content of suspended matters is less than 4 g/L.
Preferably, Na of the first electrolytic tank 12SO4The concentration of the solution is 150-200g/L, the concentration of metal ions is less than 15g/L, the temperature is 75-85 ℃, the current density is 5-10A/dm2, the concentration of hexavalent chromium is 0.5-1.5g/L, and the content of suspended matters is less than 4 g/L.
The scale layer portion of the stainless steel strip is composed of an iron-based oxide and can be effectively removed by an electrolytic process. The acid wash takes place in an aqueous solution of sodium sulfate electrolyte. The process uses a dc power supply. Electrolyte descaling is the result of alternating polarization of the strip anode and cathode by a neutral conductor system. Therefore, the stainless steel strip passes through the first electrolytic bath, and Fe can be removed2O3NiO and Cr2O3Corresponding metal ion (Fe)3+、Cr3+、Ni2+) Hydroxides are formed in the neutral solution by hydrolysis, i.e. dissolved scale, iron ions and a part of the nickel and chromium ions precipitate as hydroxide sludge, with the formation of chromates. After electrolytic pickling, the surface of the strip steel is rinsed and scrubbed in a brushing unit, and scale residues and hydroxide sludge particles are removed.
HNO of the first pickling tank 23The concentration of the metal ions is 80-150g/L, the concentration of HF is 3-40g/L, the concentration of the metal ions is less than 35g/L, and the temperature is 40-65 ℃. Preferably, HNO in the first pickling tank 23The concentration of the metal ion is 100-130g/L, the concentration of HF is 10-40g/L, the concentration of the metal ion is less than 25g/L, and the temperature is 45-60 ℃.
HNO of the second acid washing tank 33Concentration of (2)80-150g/L, 3-40g/L HF concentration, less than 35g/L metal ion concentration and 40-65 deg.C. Preferably, the HNO of the second acid washing tank 33The concentration of the metal ion is 100-130g/L, the concentration of HF is 10-40g/L, the concentration of the metal ion is less than 25g/L, and the temperature is 45-60 ℃.
HNO of the third pickling tank 43The concentration of the metal ions is 80-150g/L, the concentration of HF is 3-40g/L, the concentration of the metal ions is less than 35g/L, and the temperature is 40-65 ℃. Preferably, HNO of the third pickling tank 43The concentration of the metal ion is 100-130g/L, the concentration of HF is 10-40g/L, the concentration of the metal ion is less than 25g/L, and the temperature is 45-60 ℃.
Due to the high quality requirement of strip steel pickling, the mixed acid process is carried out in three stages. The last oxide is removed in the last pickling tank. And meanwhile, the surface is leveled, and high-quality acid washing is ensured by the strongly oxidized nitric acid.
The parameter settings of the media of the first electrolytic tank 1, the first pickling tank 2, the second pickling tank 3 and the third pickling tank 4 are set according to different section bars, so that the optimal pickling effect is achieved.
Preferably, when the stainless steel strip is 304, the medium of the first electrolytic tank is Na2SO4Solution, Na2SO4The concentration of the solution is less than 200g/L, the concentration of metal ions is less than 15g/L, the temperature is 75-85 ℃, and the current density is 10-20A/dm2The concentration of hexavalent chromium is less than 5g/L, and the content of suspended matters is less than 4 g/L;
HNO in the first pickling tank, the second pickling tank and the third pickling tank3The concentration of the metal ions is 80-150g/L, the concentration of HF is 10-40g/L, the concentration of the metal ions is less than 35g/L, and the temperature is 60-65 ℃.
Preferably, when the stainless steel band is 200, the medium of the first electrolytic tank is Na2SO4Solution, Na2SO4The concentration of the solution is less than 200g/L, the concentration of metal ions is less than 15g/L, the temperature is 75-85 ℃, and the current density is 10-20A/dm2The concentration of hexavalent chromium is less than 5g/L, and the content of suspended matters is less than 4 g/L;
HNO in the first pickling tank, the second pickling tank and the third pickling tank3Has a concentration of 80-150g/L, 3-10g/L of HF, less than 35g/L of metal ions and 45-50 ℃ of temperature.
Most of the existing pickling processes are simply provided with pickling conditions, stainless steel belts with different speeds or thicknesses are easy to fluctuate the concentration of acid, and cannot reach a balance between the consumption of metal ions and the consumption of acid, so that the acid discharge amount of the pickling process is large.
The inventor unexpectedly finds in the innovation process that when the waste discharge and the real-time volume of the steel strip in the media of the first pickling tank, the second pickling tank and the third pickling tank reach a certain relation value, a balance can be achieved between the consumption of metal ions and the consumption of acid, so that the scale layer and the chromium-free strip can be effectively removed, and the emission of acid can be reduced. Specifically, assuming that the amount of scrap discharged from the first pickling tank, the second pickling tank, and the third pickling tank is V, and the volume of the steel strip in the medium in the first pickling tank, the second pickling tank, and the third pickling tank is V1, V is (4 ml/m)3-6ml/m3) V1. Wherein the stainless steel strip has a thickness d, a width a, a velocity V, and a unit of m, V1 ═ d ×, a ×, V3/min。
In order to achieve a balance between the consumption of metal ions and the consumption of acid, the first pickling tank 2, the second pickling tank 3 and the third pickling tank 4 are respectively provided with a thickness detector for detecting the thickness d of the stainless steel strip, a width detector for detecting the width a of the stainless steel strip and a speed detector for detecting the speed v of the stainless steel strip;
the waste discharge mechanisms of the first pickling tank 2, the second pickling tank 3 and the third pickling tank 4 are provided with flow regulating devices which control HNO3And HF (4 ml/m)3-6ml/m3)*(d*a*v)。
It should be noted that the specific model selection, installation mode and installation position of the thickness detector, the width detector, the speed detector and the flow rate adjusting device can be designed according to the prior art.
When V is less than 4ml/m3V1, the consumption of metal ions is too large, which affects the removal effect of the scale layer and the chromium-free belt, and the electric energy is eliminatedThe consumption is also large; when V is more than 6ml/m3V1, the consumption of acid is too large, the emission of acid is increased, and the effects of energy conservation and emission reduction cannot be achieved.
Most preferably, the amount of waste discharged from the first pickling tank, the second pickling tank, and the third pickling tank is V, and the volume of the steel strip in the medium in the first pickling tank, the second pickling tank, and the third pickling tank is S, and V is 5ml/m3(d a v). The real-time volume of the steel belt in the pickling medium can be obtained according to the speed and the thickness of the stainless steel belt, then the waste discharge amount is adjusted in real time, the optimal balance point between the consumption of metal ions and the consumption of acid is achieved, the acid discharge is greatly reduced, the electric energy consumption is reduced, the energy conservation and emission reduction are realized, and the scale layer and the chromium-free belt are effectively removed.
The thickness of the stainless steel belt is preferably 0.3-3mm, and the conveying speed is preferably 100-200 m/min. The conveying speed and the pickling time of the stainless steel strip in the pickling process should be optimally adjusted according to different profiles.
Preferably, when the stainless steel band is 200, the transmission speed is 200m/min, the total length of the first electrolytic tank is 90-100m, the length of the anode segment is 35-38m, the total treatment time is 28-30s, and the anodic treatment time is 9-11 s; the total length of the first pickling tank, the second pickling tank and the third pickling tank is 75-85m, and the pickling time is 22-26 s.
Preferably, when the stainless steel strip is 304, the conveying speed is 200m/min, the total length of the first electrolytic tank is 90-100m, the length of the anode segment is 35-38m, the total treatment time is 28-30s, and the anodizing treatment time is 9-11 s; the total length of the first pickling tank, the second pickling tank and the third pickling tank is 75-85m, and the pickling time is 22-26 s.
Preferably, when the stainless steel strip is 316, the conveying speed is 160m/min, the total length of the first electrolytic tank is 90-100m, the length of the anode segment is 35-38m, the total treatment time is 34-39s, and the anodic treatment time is 11-16 s; the total length of the first pickling tank, the second pickling tank and the third pickling tank is 75-85m, and the pickling time is 28-32 s.
As a preferable embodiment, the waste discharge amount of the first pickling tank is 25-40ml/min, the waste discharge amount of the second pickling tank is 15-30ml/min, and the waste discharge amount of the third pickling tank is 15-30 ml/min.
Adding HNO into the first pickling tank3And HF in an amount of 35-55g/L, and adding HNO to the second acid washing tank3The amount of the mixture of HF and HNO is 35-55g/L, and HNO is added into the third pickling tank3And the amount of the mixture of HF is 30 to 50 g/L.
As a better embodiment, the waste discharge amount of the first pickling tank is 30-35ml/min, the waste discharge amount of the second pickling tank is 20-25ml/min, and the waste discharge amount of the third pickling tank is 20-25 ml/min.
Adding HNO into the first pickling tank3And HF in an amount of 40-45g/L, and adding HNO to the second acid washing tank3The amount of the mixture of HF and HNO is 40-45g/L, and HNO is added into the third pickling tank3And the amount of the mixture of HF is 35 to 40 g/L.
Therefore, the utility model discloses can obtain the real-time volume of steel band in the pickling medium according to the speed and the thickness of stainless steel band, then adjust in real time the volume of wasting discharge, reach a balance between the consumption of metal ion and the consumption of acid to reduce sour emission, reduce electric energy consumption simultaneously, realize energy saving and emission reduction. Compared with the prior art, the utility model can reduce the acid discharge by 10-20 percent and reduce the consumption of electric energy by 5-10 percent. Moreover, the HNO of the first pickling tank, the second pickling tank and the third pickling tank can be treated according to the waste discharge amount3And the addition amount of the mixture of HF and the mixture of HF is adjusted, so that the scaly layer and the chromium-free belt are efficiently removed, and the removal rate of the scaly layer and the chromium-free belt is as high as 99.9%.
Further, referring to fig. 2, the rinsing apparatus 5 includes a first spray rinsing tank 51, a second spray rinsing tank 52, a double brush machine 53, a third spray rinsing tank 54, and a thermal spray rinsing tank 55, and the first spray rinsing tank 51, the second spray rinsing tank 52, the double brush machine 53, the third spray rinsing tank 54, and the thermal spray rinsing tank 55 are connected in this order. The thermal spraying rinsing tank is provided with a steam ejector, and the temperature of rinsing water is less than 95 ℃.
The rinsing equipment 5 is used for rinsing the stainless steel strip through 6 stages of cascade, and comprises the following steps in sequence:
rinsing the stainless steel strip through a first spray rinse tank 51, said first spray rinse tank 51 comprising a single circulation tank;
rinsing the stainless steel strip through a second spray rinse tank 52, said second spray rinse tank 52 comprising a separate recycle tank;
rinsing the stainless steel strip by a double brush 53;
rinsing the stainless steel strip through a third spray rinse tank 54, said third spray rinse tank 54 comprising a separate recycle tank;
rinsing the stainless steel strip through a thermal spray rinse tank 55, said thermal spray rinse tank 55 comprising a single circulation tank, the temperature of the rinse water being < 95 ℃;
after the stainless steel strip is subjected to 6-stage cascade rinsing, the concentration of total acid is less than 10mg/L, and substances remained after electrolysis and acid pickling can be removed to obtain a flat and bright stainless steel strip product.
The stainless steel can produce a large amount of waste gas in the pickling process, and in order to save energy and reduce emission, the first electrolytic tank 1 of the utility model is connected with a first waste gas treatment system 11 for recycling the first waste gas discharged after the electrolytic treatment;
the first waste gas treatment 11 system comprises a fan, a deep spraying area, a liquid drop separator and a demister, waste gas generated by electrolysis treatment and sodium sulfate regeneration is guided to the deep spraying area through the fan, the first waste gas in the deep spraying area is contacted with a washing solution, liquid drop separation is realized through the liquid drop separator and the demister, and the washing solution in the deep spraying area is desalted water.
The first pickling tank 2, the second pickling tank 3 and the third pickling tank 4 are connected with the second waste gas treatment system 12 and used for recycling the second waste gas discharged after pickling treatment;
the second exhaust gas treatment system 12 includes a hydrofluoric acid scrubber and a nitrogen removal device, and the hydrofluoric acid scrubber removes acid components in the second exhaust gas until the acid components are reduced to a limit value, and then the nitrogen oxide is reduced by the nitrogen removal device.
The above disclosure is only a preferred embodiment of the present invention, and certainly should not be taken as limiting the scope of the invention, which is defined by the claims and their equivalents.
Claims (6)
1. An acid washing equipment for stainless steel strip, characterized by comprising:
a first electrolytic tank for electrolyzing the stainless steel strip, wherein the medium of the first electrolytic tank is Na2SO4A solution;
the first pickling tank is connected with the first electrolytic tank and used for storing the mixture so as to carry out first pickling treatment on the stainless steel strip;
the first pickling tank is provided with a first feeding mechanism for injecting a preset amount of mixture and a first waste discharging mechanism for discharging the preset amount of mixture, so that the mixture in the first pickling tank flows circularly;
the second pickling tank is connected with the first pickling tank and used for storing the mixture so as to carry out pickling treatment on the stainless steel band for the second time;
the second pickling tank is provided with a second feeding mechanism for injecting a preset amount of mixture and a second waste discharging mechanism for discharging the preset amount of mixture so as to enable the mixture in the second pickling tank to flow circularly;
a third pickling tank connected with the second pickling tank and used for storing the mixture so as to carry out third pickling treatment on the stainless steel strip;
the third pickling tank is provided with a third feeding mechanism for injecting a preset amount of mixture and a third waste discharge mechanism for discharging the preset amount of mixture, so that the mixture in the third pickling tank flows circularly;
rinsing equipment which is connected with the third pickling tank and used for rinsing the stainless steel band;
the drying equipment is connected with the rinsing equipment and used for drying the stainless steel band;
and the first pickling tank, the second pickling tank and the third pickling tank are respectively provided with a thickness detector for detecting the thickness d of the stainless steel strip, a width detector for detecting the width a of the stainless steel strip and a speed detector for detecting the speed v of the stainless steel strip.
2. The pickling apparatus for stainless steel strip as claimed in claim 1, wherein the stainless steel strip has a thickness of 0.3-3mm and a transport speed of 100-200 m/min.
3. The pickling apparatus for stainless steel strip as claimed in claim 1, wherein said rinsing apparatus comprises a first spray rinsing tank, a second spray rinsing tank, a double-brush machine, a third spray rinsing tank, and a thermal spray rinsing tank, and said first spray rinsing tank, second spray rinsing tank, double-brush machine, third spray rinsing tank, and thermal spray rinsing tank are connected in sequence.
4. A plant for pickling stainless steel strip according to claim 3 wherein said hot spray rinse tank is provided with steam jets and the temperature of the rinse water is < 95 ℃.
5. The apparatus for pickling a stainless steel strip according to claim 1 wherein said first electrolytic cell is connected to a first off-gas treatment system;
the first waste gas treatment system comprises a fan, a deep spraying area, a liquid drop separator and a demister.
6. The apparatus for pickling a stainless steel strip according to claim 1, wherein a second exhaust gas treatment system is connected to said first pickling tank, said second pickling tank, and said third pickling tank;
the second waste gas treatment system comprises a hydrofluoric acid washing tower and a denitrification device.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109594086A (en) * | 2018-12-29 | 2019-04-09 | 佛山市诚德新材料有限公司 | A kind of pickler of stainless steel band |
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2018
- 2018-12-29 CN CN201822272434.3U patent/CN210796636U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109594086A (en) * | 2018-12-29 | 2019-04-09 | 佛山市诚德新材料有限公司 | A kind of pickler of stainless steel band |
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