CN102677078B - Stop spot control method for shallow slot turbulent pickling line - Google Patents
Stop spot control method for shallow slot turbulent pickling line Download PDFInfo
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- CN102677078B CN102677078B CN 201110067115 CN201110067115A CN102677078B CN 102677078 B CN102677078 B CN 102677078B CN 201110067115 CN201110067115 CN 201110067115 CN 201110067115 A CN201110067115 A CN 201110067115A CN 102677078 B CN102677078 B CN 102677078B
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Abstract
A stop spot control method for a shallow slot turbulent pickling line comprises the following steps: 1) strip steel sequentially enters an acid bath for pickling and then enters a bleaching bath, so the residual chloridion on the surface can be rinsed; 2) corrosion inhibition solution is prepared in a corrosion inhibition solution tank in advance, pure water and corrosion inhibitor are sequentially added to the corrosion inhibition solution tank, and the addition volume of the corrosion inhibitor is 0.1wt%-2.0wt% of the addition volume of the pure water; 3) when the pickling line stops, a bleaching water pump stops operating, and the bleaching water is drained completely; 4) the corrosion inhibition solution in the corrosion inhibition solution tank is injected to the bleaching bath by a solution feed pump until the strip steel is completely immersed; 5) the pickling line is restarted, a corrosion inhibition solution emptying valve is opened, the corrosion inhibition solution is emptied to the corrosion inhibition solution tank, and then the corrosion inhibition solution emptying valve is closed; and a bleaching water reflow valve is opened, the bleaching water pump starts to operate and clean the strip steel by spraying again. the stop spot control method can effectively prevent the stop spot from being formed on the surface of the strip steel, the pickling efficiency is greatly improved, and the pickling line plate yield and rate of quality products are also improved.
Description
Technical field
The present invention relates to the strip pickling technology, be specifically related to a kind of control method of shallow slot turbulent flow pickling unit parking spot.
Background technology
Hot rolled strip at high temperature is rolled and batches, and the iron scale that belt steel surface generates under this condition covers on the surface with steel securely, and has covered the defective of belt steel surface.Therefore, the band steel must be removed its scale on surface before cold rolling, removes defective band steel.
The method of the removal iron scale that present cold rolling product line is commonly used is chlorohydric acid pickling, along with the continuous maturation of chlorohydric acid pickling technology in recent years, continuous pickling machine take shallow slot turbulent flow pickling technology as representative consists of main flow, especially the appearance of pickling and milling train associating unit greatly improves cold rolling efficient, has promoted at double throughput.But elongate along with producing line, the continous way unit often can meet with an accidet and shut down or scheduled outage, thereby forces the pickling compressor emergency shutdown.At this moment, the belt steel surface that rests in pickling tank and the rinse tank can form secondary oxidation, produces parking spot defective.The main component of parking spot is oxidizing aqueous layer, is sorrel or tawny, tissue looseness.It not only has a strong impact on the surface quality of pickled steel strip, and can produce a series of consequences of degradation under follow-up rolling difficulty, the coating tack, generally crossing the logical and excision of milling train space-time, the parking spot of excision is as scrap handling, thereby the unit lumber recovery is reduced, useless time rate improves, and has a strong impact on quality product and economic benefit.
Parking spot defective is as the No.1 defective of cold-rolling pickling unit, also there is not at present good method of controlling, parking spot defective for the short period of time, the general rewinding method that adopts, be about to be with steel to refund again pickling one time of acid tank, can reduce to a certain extent the degree of parking spot defective, but can't thoroughly eradicate.
Chinese patent CN200620127640.X discloses a kind of the realization with the continuous pickling unit of steel without the spot pickling, is used for solving the problem of eliminating belt steel rolling parking spot.This patent is the control technique that at present more representative employing rewinding method is processed the parking spot, and its core content is that the parking spot is refunded acid tank again carries out the repetition pickling.
But in actual production process, mainly there is following problem in the rewinding method: acid solution is taken out of acid tank in 1) the rewinding process, and the outer equipment of corrosion acid tank has larger side effect to equipment; 2) carry out the repetition pickling after the band steel is poured out acid tank, how be equal to one pickling process, larger on the impact of unit production capacity; 3) after the rewinding parking spot is partly repeated pickling, makes the local attenuation of band steel, when rolling thickness fluctuation produce thick poor, when serious even cause broken belt; 4) it is useless to go excision to declare for serious parking spot, causes the loss of quality and lumber recovery.
Summary of the invention
The object of the present invention is to provide the control method of a kind of shallow slot turbulent flow pickling unit parking spot, make belt steel surface form the adsorption film of one deck densification, isolated with the contacting of steel and air, thus prevent from stopping the spot generation.
For achieving the above object, technical scheme of the present invention is:
The present invention is according to the characteristic of chlorohydric acid pickling; set about from the mechanism that the parking spot produces, utilize chemical process isolated with the contacting of steel and oxygen, at the adsorption film of belt steel surface formation one deck densification; the protection metallic surface not with contact with air, fundamentally eliminated parking spot defective.
Particularly, the control method of shallow slot turbulent flow pickling unit parking spot of the present invention may further comprise the steps:
1) will enter successively acid tank through the band steel of straightening and begin pickling, enter successively more afterwards the residual chlorine ion of rinse tank clean surface; When the pickling unit normally moved, the rinse tank reverse flow valve was opened all the time, and the interior rinse water of groove are back in the rinsing water pot, returned rinse tank by the rinsing water pump again, and belt steel surface is sprayed cleaning;
2) prepare in advance corrosion inhibiting solution in the corrosion inhibiting solution tank, successively add pure water, inhibiter in the corrosion inhibiting solution tank, the inhibiter addition is the 0.1wt%～2.0wt% of pure water addition, and the temperature of control corrosion inhibiting solution is between 20～40 ℃;
3) when the pickling compressor emergency shutdown, the rinsing water pump is out of service, and rinse water begin emptying in the groove;
4) the rinse tank reverse flow valve cuts out, and the corrosion inhibiting solution liquid feed valve is opened, and by solution feed pump corrosion inhibiting solution in the corrosion inhibiting solution tank is injected in the rinse tank, until corrosion inhibiting solution will be with the complete submergence of steel; The iron ion reacting forming complex of the inhibiter in the corrosion inhibiting solution and belt steel surface;
When 5) the pickling unit was started shooting operation again, the corrosion inhibiting solution exhaust-valve was opened, and corrosion inhibiting solution in the rinse tank is emptied to the corrosion inhibiting solution tank, and the corrosion inhibiting solution exhaust-valve is closed afterwards; The rinse tank reverse flow valve is opened, and the rinsing water pump brings into operation, and again the band steel is sprayed cleaning in rinse tank.Further, described inhibiter is absorption membranous type inhibiter.
Described absorption membranous type inhibiter is selected from benzotriazole or Methylbenzotriazole.
Described rinse tank reverse flow valve is automatic valve, its On/Off action and pickling unit run signal interlocking.
In the step 3), when the pickling compressor emergency shutdown, the rinsing water pump is out of service, and the interior rinse water of groove begin emptying, and emptying time was controlled in 40 seconds, and the time-delay of rinse tank reverse flow valve was closed after 40 seconds.
In control method of the present invention:
It is absorption membranous type inhibiter (such as benzotriazole or Methylbenzotriazole etc.) that the present invention adopts inhibiter, and the inhibiter addition is the 0.1wt%～2.0wt% of pure water addition.The inhibition tank can be used for corrosion inhibiting solution is mixed with the self-circulation pipeline.For reducing temperature to the impact with steel oxidation speed, the temperature of corrosion inhibiting solution is controlled between 20～40 ℃.
The absorption membranous type inhibiter that contains in the corrosion inhibiting solution has polarity gene, can be by the surface charge absorption with steel, form complex compound by the iron ion with belt steel surface, with the chemisorption film forming, form one deck unimolecular film at whole anode and cathode zone, thereby stop or slow down corresponding electrochemical reaction.The molecule of these compounds is adsorbed on the metallic surface with hydrophilic group (for example amino), forms the corrosion inhibiting film of one deck densification, and the protection belt steel surface is not oxidized, thus the generation of the spot of avoiding stopping.
Beneficial effect of the present invention
Control method of the present invention can effectively prevent the generation of belt steel surface parking spot, greatly reduces even eliminates the parking spot to the impact of strip quality.Simultaneously because the absorption membranous type inhibiter that adopts is organic inhibitor, the inorganic inhibitor of the in the past more use of cold-rolling process such as borate etc. are compared, even enter acid purification system with rinse water, in the roasting link, also can decompose, can on the impact of brown iron oxide mass formation, can not be down to the side effect of using inhibiter to produce minimum.Adopt technique of the present invention and device, its pickling efficient can significantly improve, and corresponding raising unit lumber recovery and the percentage of A-class goods.
Description of drawings
Fig. 1 is the structural representation of shallow slot turbulent flow pickling unit of the present invention.
Embodiment
Below in conjunction with specific embodiment, further set forth the present invention.
Embodiment 1
The control method of shallow slot turbulent flow pickling unit parking spot of the present invention comprises the following steps:
1) enter successively three sections acid tanks 11,12,13 beginning pickling through the band steel of straightening, by recycle pump 14 with sour tank 15 pickle solution recycles; Enter successively more afterwards the residual chlorine ion of four sections rinse tank 21 clean surface.
When the pickling unit normally moved, rinse tank 21 reverse flow valves 22 were opened all the time, and reverse flow valve 22 is automatic valve, its On/Off action and pickling unit run signal interlocking.
2) in corrosion inhibiting solution tank 31, dispose corrosion inhibiting solution, add first pure water, add absorption membranous type inhibiter in the 0.1wt% of pure water addition～2.0wt% ratio afterwards; Open corrosion inhibiting solution solution feed pump 32, by circulating line 35 corrosion inhibiting solution is mixed; The temperature of corrosion inhibiting solution is controlled between 20～40 ℃.
3) when the pickling compressor emergency shutdown, rinsing water pump 23 is out of service, and 22 time-delays of rinse tank reverse flow valve were closed in 40 seconds.
4) behind rinse tank reverse flow valve 22 valve closess, corrosion inhibiting solution liquid flowing valve 33 is opened, and corrosion inhibiting solution solution feed pump 32 injects corrosion inhibiting solution in the corrosion inhibiting solution tank 31 in the rinse tank 21, until solution will be with the complete submergence of steel.
When 5) the pickling unit was prepared again start operation, corrosion inhibiting solution exhaust-valve 34 was opened, and corrosion inhibiting solution in the groove is emptied to corrosion inhibiting solution tank 31, and corrosion inhibiting solution exhaust-valve 34 is closed afterwards.Rinse tank exhaust-valve 34 is opened, and rinsing water pump 23 brings into operation, and again the band steel is sprayed cleaning from the rinse water in the rinsing water pot 24.
The proportioning of corrosion inhibiting solution and temperature control parameter are referring to table 1.
Table 1 corrosion inhibiting solution compound method and temperature control parameter
The present invention can effectively prevent the generation of belt steel surface parking spot, greatly reduce even eliminate the parking spot to the impact of strip quality, and the side effect that will use inhibiter that the pickling unit is produced is down to minimum.Adopt the pickling unit of technique of the present invention, its pickling efficient can significantly improve, and corresponding raising unit lumber recovery and the percentage of A-class goods, can be widely used in the continuous pickling unit, is particularly useful for using the continuous pickling unit of shallow slot turbulent flow pickling technology.
Claims (5)
1. the control method of shallow slot turbulent flow pickling unit parking spot may further comprise the steps:
1) will enter successively acid tank through the band steel of straightening and begin pickling, enter successively more afterwards the residual chlorine ion of rinse tank clean surface; When the pickling unit normally moved, the rinse tank reverse flow valve was opened all the time, and the interior rinse water of groove are back in the rinsing water pot, returned rinse tank by the rinsing water pump again, and belt steel surface is sprayed cleaning;
2) prepare in advance corrosion inhibiting solution in the corrosion inhibiting solution tank, successively add pure water, inhibiter in the corrosion inhibiting solution tank, the inhibiter addition is the 0.1wt%～2.0wt% of pure water addition, and the temperature of control corrosion inhibiting solution is between 20～40 ℃;
3) when the pickling compressor emergency shutdown, the rinsing water pump is out of service, and rinse water begin emptying in the groove;
4) the rinse tank reverse flow valve cuts out, and the corrosion inhibiting solution liquid feed valve is opened, and by solution feed pump corrosion inhibiting solution in the corrosion inhibiting solution tank is injected in the rinse tank, until corrosion inhibiting solution will be with the complete submergence of steel; The iron ion reacting forming complex of the inhibiter in the corrosion inhibiting solution and belt steel surface;
When 5) the pickling unit was started shooting operation again, the corrosion inhibiting solution exhaust-valve was opened, and corrosion inhibiting solution in the rinse tank is emptied to the corrosion inhibiting solution tank, and the corrosion inhibiting solution exhaust-valve is closed afterwards; The rinse tank reverse flow valve is opened, and the rinsing water pump brings into operation, and again the band steel is sprayed cleaning in rinse tank.
2. the control method of shallow slot turbulent flow pickling unit parking spot according to claim 1 is characterized in that described inhibiter is absorption membranous type inhibiter.
3. the control method of shallow slot turbulent flow pickling unit parking spot according to claim 2 is characterized in that described absorption membranous type inhibiter is selected from benzotriazole or Methylbenzotriazole.
4. the control method of shallow slot turbulent flow pickling unit parking spot according to claim 1 is characterized in that described rinse tank reverse flow valve is automatic valve, its On/Off action and pickling unit run signal interlocking.
5. the control method of shallow slot turbulent flow pickling unit parking spot according to claim 1 is characterized in that, in the step 3); when the pickling compressor emergency shutdown, the rinsing water pump is out of service, and rinse water begin emptying in the groove; emptying time was controlled in 40 seconds, and the time-delay of rinse tank reverse flow valve was closed after 40 seconds.
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| CN 201110067115 CN102677078B (en) | 2011-03-18 | 2011-03-18 | Stop spot control method for shallow slot turbulent pickling line |
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| CN 201110067115 CN102677078B (en) | 2011-03-18 | 2011-03-18 | Stop spot control method for shallow slot turbulent pickling line |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103331303B (en) * | 2013-06-17 | 2016-02-24 | 北京首钢股份有限公司 | A kind of pickling milling method of cold rolling parking spot |
| CN114618890B (en) * | 2022-03-23 | 2023-07-25 | 北京首钢股份有限公司 | Strip steel control method and device |
| CN115261877B (en) * | 2022-08-29 | 2023-12-08 | 粤海中粤(中山)马口铁工业有限公司 | Device and method for eliminating strip steel pickling stop spots by continuous pickling line |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007162087A (en) * | 2005-12-15 | 2007-06-28 | Nippon Steel Corp | Method for cleaning steel strip in pickling line |
| CN200952038Y (en) * | 2006-09-15 | 2007-09-26 | 唐山建龙实业有限公司 | Continuous pickling line capable of realizing band steel non-spot pickling |
| CN101096766A (en) * | 2006-06-30 | 2008-01-02 | 宝山钢铁股份有限公司 | Silicon steel sulfuric acid refining system cleaning process |
| CN101665946A (en) * | 2008-09-01 | 2010-03-10 | 鞍钢股份有限公司 | Cold-rolled strip steel pickling turbulence control device and method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007162087A (en) * | 2005-12-15 | 2007-06-28 | Nippon Steel Corp | Method for cleaning steel strip in pickling line |
| CN101096766A (en) * | 2006-06-30 | 2008-01-02 | 宝山钢铁股份有限公司 | Silicon steel sulfuric acid refining system cleaning process |
| CN200952038Y (en) * | 2006-09-15 | 2007-09-26 | 唐山建龙实业有限公司 | Continuous pickling line capable of realizing band steel non-spot pickling |
| CN101665946A (en) * | 2008-09-01 | 2010-03-10 | 鞍钢股份有限公司 | Cold-rolled strip steel pickling turbulence control device and method |
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