CN102877080A - Hot-rolled stainless steel strip steel mixed-acid pickling circulation system and method - Google Patents
Hot-rolled stainless steel strip steel mixed-acid pickling circulation system and method Download PDFInfo
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- CN102877080A CN102877080A CN2012103643460A CN201210364346A CN102877080A CN 102877080 A CN102877080 A CN 102877080A CN 2012103643460 A CN2012103643460 A CN 2012103643460A CN 201210364346 A CN201210364346 A CN 201210364346A CN 102877080 A CN102877080 A CN 102877080A
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Abstract
The invention discloses a hot-rolled stainless steel strip steel mixed-acid pickling circulation system and a method. The technical scheme of the system is that: the system comprises a mixed-acid pickling circulation tank, an acid liquid circulating pump, an acid liquid heat exchanger, and a pickling bath; an acid preparing pipeline is equipped at the top of the mixed-acid pickling circulation tank; an outlet of the mixed-acid pickling circulation tank is connected with a liquid inlet of the acid liquid circulating pump; an liquid outlet of the acid liquid circulating pump is communicated with the acid liquid heat exchanger; an outlet of the acid liquid heat exchanger is connected with the pickling bath; an acid discharge port of the pickling bath is communicated with an inlet of the mixed-acid pickling circulation tank; the system also comprises an air feed pump, and an air heat exchanger; the air feed pump is connected with an inlet of the air heat exchanger; an outlet of the air heat exchanger is connected with the pickling bath; a potential meter is disposed in the pickling bath. Through introducing certain amount of air into the acid liquid in the pickling bath, and measuring the redox reaction potential of the acid liquid in the pickling bath, the forming amount of sludge in the acid liquid is reduced, and the pickling quality of the strip steel surface is controlled well.
Description
Technical field
The present invention relates to hot-rolled stainless steel annealing and pickling field, particularly a kind of hot-rolled stainless steel band steel reinforced concrete acid pickling recycle system and method.
Background technology
Hot-rolled stainless steel annealing and pickling line is a critical process of cold-rolling stainless steel production process, what hot-rolled stainless steel band steel annealing and pickling line pickling section adopted at present generally all is the nitration mixture pickling, in the production process, what adopt is semi-automatic artificial control, at set intervals, acid solution is taken a sample, detect the concentration of acid solution, then by the artificial concentration of revising acid solution of calculating, control that can not be continuous in the production process can not be controlled well with the surface acid-washing quality of steel, and the mud formation volume in the acid cleaning process in the acid solution is also larger, increase the spent acid discharging frequency of acid solution, increased the consumption of eo-acid.
Summary of the invention
Technical problem to be solved by this invention is that the deficiency that exists for above-mentioned prior art proposes a kind ofly to increase pickling effect, improve hot-rolled stainless steel band steel reinforced concrete acid pickling acid preparing system and method with the pickling quality of steel.
The present invention solves the problems of the technologies described above the technical scheme that adopts to be: a kind of hot-rolled stainless steel band steel reinforced concrete acid pickling recycle system, it comprises nitration mixture pickling circulation tank, the acid cycle pump, the acid solution interchanger, pickling tank, the top of nitration mixture pickling circulation tank disposes the complex acid pipeline, the outlet of nitration mixture pickling circulation tank is connected with the fluid inlet of acid cycle pump, the liquid outlet of acid cycle pump is communicated with the entrance of acid solution interchanger, the outlet of acid solution interchanger links to each other with pickling tank, pickling tank the acid discharge mouth be connected with nitration mixture pickling circulation tank entrance, also comprise air air feed pump and air heat exchanger, the air air feed pump links to each other with the entrance of air heat exchanger, the outlet of air heat exchanger links to each other with pickling tank, is provided with the potential measurement meter in pickling tank.
By technique scheme, the outlet of air heat exchanger links to each other with nozzle by airflow pipe, and nozzle is arranged in the pickling tank.
By technique scheme, described nozzle is 4 ~ 6, is 14cm ~ 16cm apart from the distance of pickling tank bottom land, and the angle that described nozzle arranges is 12 ° obliquely ~ 15 °.
By technique scheme, be connected with the spent acid transport pipe at the leakage fluid dram of pickling recycle pump.
By technique scheme, described nitration mixture pickling circulation tank is 2.
By technique scheme, above pickling tank, also be provided with the acid mist emission pipeline.
A kind of hot-rolled stainless steel band steel reinforced concrete acid acid washing method, it may further comprise the steps:
(1) first the nitration mixture in the nitration mixture pickling circulation tank is passed into the acid solution interchanger and carry out circulating-heating to nitration mixture pickling circulation tank again;
(2) the nitration mixture acid solution that heats is injected pickling tank, after reaching the requirement liquid level, the liquid level in the pickling tank passes into stainless steel strip, simultaneously, the nitration mixture acid solution from pickling tank to nitration mixture pickling circulation tank to the acid solution interchanger again to pickling tank, thereby realize stainless steel strip is carried out cycle pickling;
(3) start the air air feed pump, with air heat exchanger air heating is arrived the temperature identical with the nitration mixture acid solution, the air that heated is passed into carries out redox reaction in the pickling tank, adopt the potential measurement meter to measure the electromotive force of redox reaction in the pickling tank.
By technique scheme, when passing into ferritic stainless steel strip steel, the needed air capacity 2.74Nm of each hour every square metre of band steel
3~ 3.08Nm
3When passing into the austenic stainless steel belt steel, the needed air capacity 1.84Nm of each hour every square metre of band steel
3~ 2.11Nm
3
By technique scheme, the redox reaction electromotive force is controlled according to steel grade type and surface condition with steel.
By technique scheme, described redox reaction electromotive force is controlled at 0-+600mv.
By technique scheme, described redox reaction electromotive force is controlled at+100mv-+300mv.
The present invention's beneficial effect obtained with respect to prior art is: 1, native system is by arranging pneumatic pump and air heat exchanger and potential measurement meter, by producing redox reaction, reduced the formation volume of mud in the acid solution, improved the strip pickling surface quality, owing to reduced the spent acid discharging frequency of acid solution, saved the consumption of eo-acid, reduced production costs, all be suitable for for different steel grades; 2, pass into a certain amount of air by the acid solution in pickling tank, also measure simultaneously the method for the redox reaction electromotive force of acid solution in the pickling tank, the redox reaction electromotive force of acid solution is remained in the scope of 0 ~ 600mv, reduce the formation volume of the central mud of acid solution, controlled preferably the pickling quality of belt steel surface.
Description of drawings
Fig. 1 is principle schematic of the present invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail.
As shown in Figure 1, it comprises nitration mixture pickling circulation tank T1 and nitration mixture pickling circulation tank T2, air air feed pump 9, air heat exchanger 7, acid cycle pump 13, acid solution interchanger 16, pickling tank 22, the top of two nitration mixture pickling circulation tanks all is connected with the HNO3 service, the HF service, the regenerating acid service, the service water service, the outlet of nitration mixture pickling circulation tank T1 is provided with control valve 10, the outlet of nitration mixture pickling circulation tank T2 is provided with control valve 12, control valve 10 is connected with control valve by 11 connections of acid solution transport pipe, the fluid inlet of acid cycle pump 13 is communicated with acid solution transport pipe 11, the liquid outlet of acid cycle pump 13 is communicated with spent acid pipeline 14 on the one hand, the discharging of spent acid is by control valve 15 controls, entrance with acid solution interchanger 16 is communicated with on the other hand, the outlet of acid solution interchanger 16 links to each other by pipeline 17 with pickling tank 22, be installed on control valve 18 at pipeline 17, the outlet of acid solution interchanger 16 also is connected respectively corresponding and nitration mixture pickling circulation tank T1 by control valve 8 respectively simultaneously and is connected entrance with nitration mixture pickling circulation tank T2 and is connected with control valve.Pickling tank 22 is provided with three overflow grooves, is respectively overflow groove 3, overflow groove 21 and overflow groove 24, pickling tank 22 the acid discharge mouth be connected by the entrance of acid solution reflux line with nitration mixture pickling circulation tank T1 on the one hand, the backflow of acid solution is controlled by control valve 4; On the other hand by being communicated with the entrance of nitration mixture pickling circulation tank T2 by the acid solution return line, the backflow of acid solution is by control valve 25 controls, air air feed pump 9 links to each other with the entrance of air heat exchanger 7, the outlet of air heat exchanger 7 is communicated with by airflow pipe 6, tail end at airflow pipe is provided with nozzle, nozzle is arranged in the acid solution of pickling tank, is provided with potential measurement meter 5 and the potential measurement meter 20 of measuring acid solution redox reaction electromotive force in pickling tank.
Principle of work of the present invention is: when passing into air in the pickling tank, and O in the air
2With Fe
2+It is as follows to react:
In the time of between the pH value that passes into continuously air and acid solution remains on 1 ~ 3, the direction of reaction formula trends towards generating Fe
3+The reaction positive dirction moves.
Under the same conditions, when the reaction soln temperature reaches 50 ℃ of left and right sides, Fe
3+With F
-The Fe F that forms
3﹒ 3H
2O solubleness in the middle of acid solution is Fe
2+With F
-The Fe F that forms
2﹒ nH
23-4 times of O solubleness.Size by electromotive force in the potential measurement instrumentation amount pickling tank can the reaction acid washing trough in mud formation what, more the mud of the bright generation of novel is fewer for the reaction electromotive force, generally, the selection of acid solution redox reaction electromotive force needs to decide according to steel grade type and surface condition with steel, the redox reaction electromotive force of acid solution need be controlled at 0 ~+600mv, preferably be controlled at+100 ~+300mv.
The acid washing conditions of different steel grades in pickling tank is as follows:
Ferritic stainless steel: HF:3 ~ 10g/l, HNO3:80 ~ 100 g/l, T:40 ~ 50 ℃, Fe
3+: 〉=15g/l;
Austenitic stainless steel: HF:30 ~ 40g/l, HNO3:80 ~ 100 g/l, T:50 ~ 60 ℃, Fe
3+: 〉=15g/l.
The intake of pickling tank Air needs to calculate according to the area that passes through with steel, and the air capacity that each pickling tank per hour passes into is: every m
2The air capacity that need to pass into steel is not less than 1Nm
3(Nm
3The meaning is: temperature is that 20 ℃, normal atmosphere are a certain amount of volume of air under 1 normal atmosphere conditions).
A kind of hot-rolled stainless steel band steel reinforced concrete acid acid washing method is:
When the pickling chrome content is 17% ferritic stainless steel strip steel 2, the band steel is wide to be 1000mm, thick 2mm, strip pickling is by wide 2.2m, the pickling tank of long 15m, when including the acid solution of 30000L in the whole recycle system, select nitration mixture pickling circulation tank T1 to carry out complex acid, in the acid solution: HF:5g/l, HNO3:80 ~ 100 g/l, T:40 ~ 50 ℃, Fe
3+: 25g/l, after complex acid is finished, open control valve 10, start acid cycle pump 13 and acid solution interchanger 16, carry out first the partial circulating heating, acid solution is heated to target temperature, at this moment control valve 8,10 open, other control valves are closed, and after acid solution is heated to target temperature, carry out systemic circulation, acid solution is injected in the pickling tank 22, at this moment control valve 10,18,4 open, and other control valves are closed, and the acid solution in the pickling tank 22 reaches after the certain liquid, acid solution overflows in the middle of the pickling tank and the overflow groove 21 of both sides, 3, in 24, acid solution is back among the nitration mixture pickling circulation tank T1 by reflux line, at this moment, passes into ferritic stainless steel strip steel 2 and produces.
Simultaneously, start air air feed pump 9, with air be input to be preheating to the temperature identical with the nitration mixture acid solution in the air heat exchanger 7 after, with air by nozzle by in pickling tank, the acid mist that produces in the pickling tank and waste gas are taken away by acid mist emission pipeline 1 and acid mist emission pipeline 22.
Air is by being installed in the pickling tank side and spraying into pickling tank close to the nozzle bottom the pickling tank, the number of nozzle is 5, nozzle distance pickling tank distance from bottom is 15cm, and the distance between each nozzle is 2.2 m ~ 3.3m, and the setting angle of nozzle is obliquely 13
0, by test of many times, when the cumulative volume that passes into the pickling tank air is 82 Nm
3/ h-92 Nm
3/ h, relatively good with the cleaning performance of steel, especially the cumulative volume when the pickling tank air is 87 Nm
3/ h, best with the cleaning performance of steel, this moment acid solution redox reaction electromotive force need maintain+150mv about.
The below is take the cumulative volume of pickling tank air as 87 Nm
3/ h is example, calculates every m of each hour
2The needed air capacity of band steel.
In the middle of 1 hour, the band steel total area that passes into pickling tank is: 18(m/min) x2x1(m) x60(min)=and 2160m
2
Pickling time with steel is: 15 (m)/18 (m/min)=0.83min=0.83/60h, the band steel area that passed through in 1 hour is: 2160(m
2/ h) x0.83/60(h)=29.88 m
2
Every m of each hour then
2The needed air capacity of band steel is: 87 (Nm
3/ h)/29.88(m
2/ h)=2.9 Nm
3
It is 82 Nm that same method of calculation are calculated the cumulative volume that ought pass into the pickling tank air
3/ h-92 Nm
3/, corresponding every m of each hour
2The needed air capacity 2.74Nm of band steel
3~ 3.08Nm
3
After pickling is through the broken phosphorus of machinery, when width is 1250mm, thick austenic stainless steel belt steel 2 for 0.9mm, select nitration mixture pickling circulation tank T2 to carry out complex acid, in the acid solution: HF:25g/l, HNO3:80 ~ 100 g/l, T:50 ~ 60 ℃, Fe
3+: 25g/l.After complex acid is finished, open control valve 12, start acid cycle pump 13 and acid solution interchanger 16, carry out first the partial circulating heating, acid solution is heated to target temperature, and at this moment control valve 12,19 open, and other control valves are closed, after acid solution is heated to target temperature, carry out systemic circulation, acid solution is injected in the pickling tank 22, at this moment control valve 12,18,25 open, other control valves are closed, acid solution in the pickling tank 22 reaches after the certain liquid, and acid solution overflows in the middle of the pickling tank and the overflow groove 21 of both sides, 3, in 24, acid solution is back among the nitration mixture pickling circulation tank T2 by reflux line, at this moment, passing into austenic stainless steel belt steel 2 produces.The austenic stainless steel belt steel is 38m/min by the speed of this pickling tank.
Simultaneously, start air air feed pump 9, with air be input to be preheating to the temperature identical with the nitration mixture acid solution in the air heat exchanger 7 after, with air by nozzle by in pickling tank, the acid mist that produces in the pickling tank and waste gas are taken away by acid mist emission pipeline 1 and acid mist emission pipeline 22.By test of many times, the volume of air that per hour passes in the pickling tank is 68m
3/ h-78 m
3/ h, the effect of strip pickling is relatively good, when being 73 m
3During/h, the strip pickling effect is best, in the middle of the pickling tank redox reaction electromotive force of acid solution maintain+more than the 220mv.
In the middle of 1 hour, the band steel total area that passes into pickling tank is:
38（m/min）?x1.25（m）x2x60（min）=5700m
2
Pickling time with steel is: 15 (m)/38 (m/min)=0.39min=0.39/60h, the band steel area that passed through in 1 hour is: 5700(m
2/ h) x0.39/60(h)=37.05 m
2
Every m of each hour then
2The needed air capacity of band steel is: 73 (Nm
3/ h)/37.05(m
2/ h)=1.97 Nm
3
It is 68Nm that same method of calculation are calculated the cumulative volume that ought pass into the pickling tank air
3/ h-78 Nm
3/ h, corresponding every m of each hour
2The needed air capacity 1.84Nm of band steel
3~ 2.11Nm
3
To sum up, pass into a certain amount of air by the acid solution in pickling tank, also measure simultaneously the redox reaction electromotive force of acid solution in the pickling tank, the redox reaction electromotive force of acid solution is remained in the scope of 0 ~ 600mv, can reduce the formation volume of the central mud of acid solution, control preferably the pickling quality of belt steel surface, simultaneously, because the formation volume of mud is less in the acid solution, reduced the spent acid discharging frequency of acid solution, reduce the consumption of eo-acid, reduced production cost.And utilize the needed pickling time of native system pickling of stainless steel band steel shorter, can improve the process section speed of whole production line, improved production efficiency.The present invention can be used for the transformation of existing stainless steel annealing pickling line, can reduce the consumption of production line acid, increases pickling effect, reduces production costs, and also can alleviate environmental pollution simultaneously.
Claims (10)
1. the hot-rolled stainless steel band steel reinforced concrete acid pickling recycle system, it comprises nitration mixture pickling circulation tank, the acid cycle pump, the acid solution interchanger, pickling tank, the top of nitration mixture pickling circulation tank disposes the complex acid pipeline, the outlet of nitration mixture pickling circulation tank is connected with the fluid inlet of acid cycle pump, the liquid outlet of acid cycle pump is communicated with the entrance of acid solution interchanger, the outlet of acid solution interchanger links to each other with pickling tank, pickling tank the acid discharge mouth be connected with nitration mixture pickling circulation tank entrance, it is characterized in that: also comprise air air feed pump and air heat exchanger, the air air feed pump links to each other with the entrance of air heat exchanger, the outlet of air heat exchanger links to each other with pickling tank, is provided with the potential measurement meter in pickling tank.
2. a kind of hot-rolled stainless steel band steel reinforced concrete acid pickling recycle system according to claim 1 is characterized in that the outlet of air heat exchanger links to each other with nozzle by airflow pipe, and nozzle is arranged in the pickling tank.
3. a kind of hot-rolled stainless steel band steel reinforced concrete acid pickling recycle system according to claim 2 is characterized in that described nozzle is 4 ~ 6, is 14cm ~ 16cm apart from the distance of pickling tank bottom land, and the angle that described nozzle arranges is 12 ° obliquely ~ 15 °.
4. a kind of hot-rolled stainless steel band steel reinforced concrete acid pickling recycle system according to claim 1 and 2 is characterized in that being connected with the spent acid transport pipe at the leakage fluid dram of pickling recycle pump.
5. a kind of hot-rolled stainless steel band steel reinforced concrete acid pickling recycle system according to claim 1 and 2 is characterized in that described nitration mixture pickling circulation tank is 2.
6. a kind of hot-rolled stainless steel band steel reinforced concrete acid pickling recycle system according to claim 1 and 2 is characterized in that also being provided with the acid mist emission pipeline above pickling tank.
7. hot-rolled stainless steel band steel reinforced concrete acid acid washing method, it is characterized in that: it may further comprise the steps:
(1) first the nitration mixture in the nitration mixture pickling circulation tank is passed into the acid solution interchanger and carry out circulating-heating to nitration mixture pickling circulation tank again;
(2) the nitration mixture acid solution that heats is injected pickling tank, after reaching the requirement liquid level, the liquid level in the pickling tank passes into stainless steel strip, simultaneously, the nitration mixture acid solution from pickling tank to nitration mixture pickling circulation tank to the acid solution interchanger again to pickling tank, thereby realize cycle pickling to stainless steel strip;
(3) start the air air feed pump, with air heat exchanger air heating is arrived the temperature identical with the nitration mixture acid solution, the air that heated is passed into carries out redox reaction in the pickling tank, adopt the potential measurement meter to measure the electromotive force of the redox reaction of acid solution in the pickling tank.
8. a kind of hot-rolled stainless steel band steel reinforced concrete acid acid washing method according to claim 7 is characterized in that: when passing into ferritic stainless steel strip steel, and the needed air capacity 2.74Nm of each hour every square metre of band steel
3~ 3.08Nm
3When passing into the austenic stainless steel belt steel, the needed air capacity 1.84Nm of each hour every square metre of band steel
3~ 2.11Nm
3
9. a kind of hot-rolled stainless steel band steel reinforced concrete acid acid washing method according to claim 8 is characterized in that: described redox reaction electromotive force is controlled at 0-+600mv.
10. a kind of hot-rolled stainless steel band steel reinforced concrete acid acid washing method according to claim 8 is characterized in that: described redox reaction electromotive force is controlled at+and 100mv-+300mv.
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| CN103353776A (en) * | 2013-06-17 | 2013-10-16 | 邯钢集团邯宝钢铁有限公司 | Method for controlling acid liquid temperature in pickling in acid rolling mill set |
| CN105887103A (en) * | 2016-06-02 | 2016-08-24 | 中冶南方工程技术有限公司 | Nitric acid-free acid pickling method for hot-rolled 430 ferritic stainless steel |
| CN105887104A (en) * | 2016-06-02 | 2016-08-24 | 中冶南方工程技术有限公司 | Nitric acid-free pickling method for hot-rolled 439 ferrite stainless steel |
| CN105908196A (en) * | 2016-06-02 | 2016-08-31 | 中冶南方工程技术有限公司 | Nitric acid-free acid washing method of hot-rolled 304 austenitic stainless steel |
| CN105908195A (en) * | 2016-06-02 | 2016-08-31 | 中冶南方工程技术有限公司 | Nitric acid-free acid washing method of hot-rolled 409L ferrite stainless steel |
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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 |
| CN113584497A (en) * | 2021-07-23 | 2021-11-02 | 中冶南方工程技术有限公司 | Strip steel pickling device and method |
| WO2021223441A1 (en) * | 2020-05-05 | 2021-11-11 | 中冶南方工程技术有限公司 | Strip-steel mixed-acid pickling system |
| CN114593368A (en) * | 2020-12-07 | 2022-06-07 | 阳江宏旺实业有限公司 | Waste acid system with internal circulation structure |
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| CN103353776A (en) * | 2013-06-17 | 2013-10-16 | 邯钢集团邯宝钢铁有限公司 | Method for controlling acid liquid temperature in pickling in acid rolling mill set |
| CN103353776B (en) * | 2013-06-17 | 2015-05-13 | 邯钢集团邯宝钢铁有限公司 | Method for controlling acid liquid temperature in pickling in acid rolling mill set |
| CN105887103A (en) * | 2016-06-02 | 2016-08-24 | 中冶南方工程技术有限公司 | Nitric acid-free acid pickling method for hot-rolled 430 ferritic stainless steel |
| CN105887104A (en) * | 2016-06-02 | 2016-08-24 | 中冶南方工程技术有限公司 | Nitric acid-free pickling method for hot-rolled 439 ferrite stainless steel |
| CN105908196A (en) * | 2016-06-02 | 2016-08-31 | 中冶南方工程技术有限公司 | Nitric acid-free acid washing method of hot-rolled 304 austenitic stainless steel |
| CN105908195A (en) * | 2016-06-02 | 2016-08-31 | 中冶南方工程技术有限公司 | Nitric acid-free acid washing method of hot-rolled 409L ferrite stainless steel |
| CN106011886A (en) * | 2016-06-02 | 2016-10-12 | 中冶南方工程技术有限公司 | Nitric acid-free pickling method for hot-rolled 201 austenitic stainless steel |
| CN105908195B (en) * | 2016-06-02 | 2018-03-27 | 中冶南方工程技术有限公司 | A kind of hot rolling 409L ferritic stainless steels are without nitric acid acidwashing method |
| CN107881518A (en) * | 2017-11-20 | 2018-04-06 | 安徽新洲钢业有限公司 | A kind of Treatment of Sludge line in steel pipe's production workshop |
| CN107893235A (en) * | 2017-11-20 | 2018-04-10 | 安徽新洲钢业有限公司 | A kind of method for sludge treatment in steel pipe's production workshop |
| CN107881518B (en) * | 2017-11-20 | 2019-07-19 | 安徽新洲钢业有限公司 | A kind of Treatment of Sludge line in steel pipe's production workshop |
| CN107893235B (en) * | 2017-11-20 | 2019-08-09 | 安徽新洲钢业有限公司 | A kind of method for sludge treatment in steel pipe's production workshop |
| 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 |
| WO2021223441A1 (en) * | 2020-05-05 | 2021-11-11 | 中冶南方工程技术有限公司 | Strip-steel mixed-acid pickling system |
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| CN114593368A (en) * | 2020-12-07 | 2022-06-07 | 阳江宏旺实业有限公司 | Waste acid system with internal circulation structure |
| CN113584497A (en) * | 2021-07-23 | 2021-11-02 | 中冶南方工程技术有限公司 | Strip steel pickling device and method |
| WO2023000520A1 (en) * | 2021-07-23 | 2023-01-26 | 中冶南方工程技术有限公司 | Low-consumption high-efficiency silicon steel normalizing acid pickling process and acid pickling apparatus |
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Application publication date: 20130116 |