CN101775609A - Method for reducing chloride ion content on surface of pickled steel strip - Google Patents
Method for reducing chloride ion content on surface of pickled steel strip Download PDFInfo
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- CN101775609A CN101775609A CN 201010131002 CN201010131002A CN101775609A CN 101775609 A CN101775609 A CN 101775609A CN 201010131002 CN201010131002 CN 201010131002 CN 201010131002 A CN201010131002 A CN 201010131002A CN 101775609 A CN101775609 A CN 101775609A
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Abstract
The invention discloses a method for reducing chloride ion content on the surface of a pickled steel strip, which adds a steel strip rinsing process between a steel strip pickling process and a steel strip drying process. The steel strip rinsing process comprises the steps of making the pickled steel strip pass through a rinsing system continuously from a low temperature segment to a high temperature segment, performing water spray rinsing on the steel strip before the steel strip is outputted from a pickling tank and enters the rinsing system, and transversally purging the steel strip before the steel strip is outputted from a rinsing water tank and enters the drying process; and the rinsing system consists of five sections of rinsing circulation tanks with different temperatures. In the method, the steel strip is washed by adopting water spray rinsing firstly, and the steel strip is put in the five sections of the rinsing circulation tanks with different temperatures for rinsing to ensure that the chloride ion content of the rinsing water is reduced to lower than 15mg/l, acid does not exist on the surface of the steel strip, and the surface quality of the steel strip which is subjected to cold rolling is improved. Furthermore, the method improves the speed of removing the chloride ions from the surface of the steel strip, reduces water consumption, and saves cost.
Description
Technical field
The present invention relates to a kind of hot rolled strip and enter the cold rolling method of before the band steel being handled, relate in particular to a kind of method that reduces chloride ion content on surface of pickled steel strip.
Background technology
Hot rolled strip enter cold rolling before must to the band steel carry out operations such as prewashing, pickling and oven dry, dust and the grease of water cleaning to remove belt steel surface mainly adopted in prewashing, the iron rust (as ferric oxide, ferric oxide and Z 250 etc.) of belt steel surface is mainly removed in pickling, the main moisture of removing belt steel surface of oven dry is avoided belt steel surface generation corrosion.
The quality of pickling quality has played deterministic effect to the surface quality of cold-rolled steel strip products, and the quality of strip pickling post rinsing quality directly influences the quality of final finished, and the chloride ion content in the rinse water is the important parameter of measurement rinsing quality.In the prior art, mainly the band steel after the pickling is washed away, residual acid solution with belt steel surface after the pickling of place to go, arrive the purpose of rinsing, but mainly there is following deficiency in this mode to the removal of the belt steel surface after pickling chlorion: the chlorion that one, can not remove belt steel surface fully, and the chlorion that remains in belt steel surface will seriously corrode belt steel surface, belt steel surface is yellow or yellowish green spot usually, behind the belt steel rolling of corrosion not as normal light like that, behind the finished product warehouse-in corrosion takes place once more easily; Two, the content of chlorion is at 100mg/l～150mg/l in the final rinse water, and not only the consumption of rinse water is big, and also can produce corrosion seriously to equipment such as rinse tank, grooves; Three, influenced the quality of thin plate after the roll forming, selling price reduces, and the maintenance and the maintenance cost of equipment also can increase simultaneously.
Summary of the invention
At weak point of the prior art, the invention provides chloride ion content in a kind of effective reduction rinse water, improve the pickled steel strip surface quality, reduction equipment is subjected to the method for the reduction chloride ion content on surface of pickled steel strip of extent of corrosion.
The method of reduction chloride ion content on surface of pickled steel strip provided by the invention, between pickled steel strip operation and drying belt steel operation, increase rinsing band steel operation, described rinsing band steel operation is meant passes through rinse-system continuously with the band steel after the pickling from the low-temperature zone to the high temperature section, and before band steel output pickling tank enters rinse-system to the rinsing of spraying water of band steel, before band steel output rinsing water tank is dried, the band steel is laterally purged;
Described rinse-system is made up of five sections rinse cycle casees, and first section interior rinse water of rinse cycle case is controlled at 55 ℃～57 ℃; Second section interior rinse water of rinse cycle case is controlled at 60 ℃～63 ℃; The 3rd section interior rinse water of rinse cycle case are controlled at 67 ℃～70 ℃; The 4th section interior rinse water of rinse cycle case are controlled at 75 ℃～78 ℃; The 5th section interior rinse water of rinse cycle case are controlled at 82 ℃～85 ℃; Described the 5th section rinse cycle case, the 4th section rinse cycle case, the 3rd section rinse cycle case, second section rinse cycle case and first section rinse cycle case are ladder from high to low and distribute.
Further, described band steel output pickling tank enters the temperature of before the rinse-system band steel being sprayed water and is controlled at 50 ℃～55 ℃.
Compared with prior art, the present invention has following advantage:
1, before band steel output pickling tank enters rinse-system to the rinsing of spraying water of band steel, again will be with rinsing in five sections rinse cycle casees of steel input differing temps, reduced the content of chlorion in the rinse water, chloride ion content can be reduced to below the 15mg/l, make belt steel surface not be with sour matter, improved the surface quality behind the cold rolling of strip steel.
2, adopt the circulation rinse water of certain temperature to carry out rinsing, improved the speed of belt steel surface removal chlorion, reduced water consumption, save cost.
3, because the reduction of chloride ion content in the final rinse water has also reduced the corrosion to equipment such as rinse tank, grooves, reduced the maintenance and the maintenance cost of equipment.
Embodiment
Reduce the method for chloride ion content on surface of pickled steel strip, between pickled steel strip operation and drying belt steel operation, increase rinsing band steel operation, described rinsing band steel operation is meant passes through rinse-system continuously with the band steel after the pickling from the low-temperature zone to the high temperature section, and band steel output pickling tank enter float Xian system before to the rinsing of spraying water of band steel, before band steel output rinsing water tank is dried, the band steel is carried out laterally (laterally referring to along the width of being with steel) purging.
Rinse-system is made up of five sections rinse cycle casees, and first section interior rinse water of rinse cycle case is controlled at 55 ℃～57 ℃; Second section interior rinse water of rinse cycle case is controlled at 60 ℃～63 ℃; The 3rd section interior rinse water of rinse cycle case are controlled at 67 ℃～70 ℃; The 4th section rinse cycle case is controlled at 75 ℃～78 ℃; The 5th section interior rinse water of rinse cycle case are controlled at 82 ℃～85 ℃; Described the 5th section rinse cycle case, the 4th section rinse cycle case, the 3rd section rinse cycle case, second section rinse cycle case and first section rinse cycle case are ladder from high to low and distribute.
In the present embodiment, band steel output pickling tank enters the temperature of before the rinse-system band steel being sprayed water and is controlled at 50 ℃～55 ℃, the water spray that has certain temperature carries out at first rinsing, both flushablely fall to export a large amount of residual acid that remains in belt steel surface behind the pickling tank, simultaneously, the residual acid of avoiding temperature to cross low strap steel surface is set in the surface of band steel, helps five sections rinse cycle casees to the follow-up rinsing of band steel.
When using this method, at first the output terminal at pickling tank is provided with one group of spray water, output terminal at five sections rinse cycle casees is provided with blow device (can adopt pressurized air), when exporting, just opens the band steel after pickling spray water, avoid the belt steel surface cooling, residual acid cure is solid, first behind the spray rinsing, import first section rinse cycle case immediately successively, second section rinse cycle case, the 3rd section rinse cycle case, in the 4th section rinse cycle case and the 5th section rinse cycle case, the temperature of the rinse water in the rinse cycle case from low to high, recirculated water from top to bottom carries out rinsing, just adopt blow device that the band steel is laterally purged after the rinsing of band steel, remove impurity and water that belt steel surface stays, enter baking operation at last.
The Xian Shui that floats after the rinse cycle case rinsing under the differing temps is carried out chloride ion content and inspects by random samples, as shown in the table.
| Five sections rinse cycle casees | First section rinse cycle case | Second section rinse cycle case | The 3rd section rinse cycle case | The 4th section rinse cycle case | The 5th section rinse cycle case |
| The rinse water temperature (℃) | ??55℃ | ??60℃ | ??68℃ | ??75℃ | ??82℃ |
| Chloride ion content (mg/l) | ??9800 | ??6800 | ??2800 | ??1800 | ??14.75 |
| Five sections rinse cycle casees | First section rinse cycle case | Second section rinse cycle case | The 3rd section rinse cycle case | The 4th section rinse cycle case | The 5th section rinse cycle case |
| Five sections rinse cycle casees | First section rinse cycle case | Second section rinse cycle case | The 3rd section rinse cycle case | The 4th section rinse cycle case | The 5th section rinse cycle case |
| The rinse water temperature (℃) | ??56℃ | ??61℃ | ??69℃ | ??76℃ | ??84℃ |
| Chloride ion content (mg/l) | ??9490 | ??6500 | ??2100 | ??1600 | ??14.72 |
| Five sections rinse cycle casees | First section rinse cycle case | Second section rinse cycle case | The 3rd section rinse cycle case | The 4th section rinse cycle case | The 5th section rinse cycle case |
| The rinse water temperature (℃) | ??57℃ | ??63℃ | ??70℃ | ??78℃ | ??85℃ |
| Chloride ion content (mg/l) | ??8400 | ??5500 | ??1980 | ??1470 | ??14.69 |
The data of inspecting by random samples from top three tables can have been seen, rising along with temperature, the band steel reduces rapidly from the chloride ion content of four sections rinse cycle casees of first section rinse cycle case to the rear surface, but the chlorion of belt steel surface almost is eliminated after through the 5th section rinse cycle case.
Explanation is at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (2)
1. method that reduces chloride ion content on surface of pickled steel strip, it is characterized in that: between pickled steel strip operation and drying belt steel operation, increase rinsing band steel operation, described rinsing band steel operation is meant passes through rinse-system continuously with the band steel after the pickling from the low-temperature zone to the high temperature section, and before band steel output pickling tank enters rinse-system to the rinsing of spraying water of band steel, before band steel output rinsing water tank is dried, the band steel is laterally purged;
Described rinse-system is made up of five sections rinse cycle casees, and first section interior rinse water of rinse cycle case is controlled at 55 ℃～57 ℃; Second section interior rinse water of rinse cycle case is controlled at 60 ℃～63 ℃; The 3rd section interior rinse water of rinse cycle case are controlled at 67 ℃～70 ℃; The 4th section interior rinse water of rinse cycle case are controlled at 75 ℃～78 ℃; The 5th section interior rinse water of rinse cycle case are controlled at 82 ℃～85 ℃; Described the 5th section rinse cycle case, the 4th section rinse cycle case, the 3rd section rinse cycle case, second section rinse cycle case and first section rinse cycle case are ladder from high to low and distribute.
2. the method for reduction chloride ion content on surface of pickled steel strip according to claim 1 is characterized in that: described band steel output pickling tank enters the temperature of before the rinse-system band steel being sprayed water and is controlled at 50 ℃～55 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101310026A CN101775609B (en) | 2010-03-23 | 2010-03-23 | Method for reducing chloride ion content on surface of pickled steel strip |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101310026A CN101775609B (en) | 2010-03-23 | 2010-03-23 | Method for reducing chloride ion content on surface of pickled steel strip |
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| CN101775609A true CN101775609A (en) | 2010-07-14 |
| CN101775609B CN101775609B (en) | 2011-12-21 |
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| CN2010101310026A Expired - Fee Related CN101775609B (en) | 2010-03-23 | 2010-03-23 | Method for reducing chloride ion content on surface of pickled steel strip |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105483734A (en) * | 2015-12-08 | 2016-04-13 | 无锡华工薄板有限公司 | Dechlorination system with steel cleaning device |
| CN114807954A (en) * | 2022-04-29 | 2022-07-29 | 常熟科弘材料科技有限公司 | Strip steel pickling method with antirust effect and strip steel pickling line thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0396292A (en) * | 1989-09-08 | 1991-04-22 | Toshiba Corp | Printed wiring board |
| CN2692165Y (en) * | 2004-03-31 | 2005-04-13 | 宝山钢铁股份有限公司 | Acid pickling machine set flushing tank flushing device |
| 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 |
| JP2009185747A (en) * | 2008-02-07 | 2009-08-20 | Frontier:Kk | Method of manufacturing pump housing of spray vessel |
-
2010
- 2010-03-23 CN CN2010101310026A patent/CN101775609B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0396292A (en) * | 1989-09-08 | 1991-04-22 | Toshiba Corp | Printed wiring board |
| CN2692165Y (en) * | 2004-03-31 | 2005-04-13 | 宝山钢铁股份有限公司 | Acid pickling machine set flushing tank flushing device |
| 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 |
| JP2009185747A (en) * | 2008-02-07 | 2009-08-20 | Frontier:Kk | Method of manufacturing pump housing of spray vessel |
Non-Patent Citations (1)
| Title |
|---|
| 《中国优秀硕士学位论文全文数据库（电子期刊）工程科技I辑》 20080815 程玲俐 不锈钢冷带退火酸洗的工艺及设备的研究 55-56 1-2 , 第8期 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105483734A (en) * | 2015-12-08 | 2016-04-13 | 无锡华工薄板有限公司 | Dechlorination system with steel cleaning device |
| CN114807954A (en) * | 2022-04-29 | 2022-07-29 | 常熟科弘材料科技有限公司 | Strip steel pickling method with antirust effect and strip steel pickling line thereof |
| CN114807954B (en) * | 2022-04-29 | 2023-11-21 | 常熟科弘材料科技有限公司 | Strip steel pickling method with rust-proof effect and strip steel pickling line thereof |
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| CN101775609B (en) | 2011-12-21 |
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