CN103451669B - Pickling liquid circulated stainless steel pickling mist inhibition system and pickling process thereof - Google Patents
Pickling liquid circulated stainless steel pickling mist inhibition system and pickling process thereof Download PDFInfo
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- CN103451669B CN103451669B CN201310361064.XA CN201310361064A CN103451669B CN 103451669 B CN103451669 B CN 103451669B CN 201310361064 A CN201310361064 A CN 201310361064A CN 103451669 B CN103451669 B CN 103451669B
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- 238000005554 pickling Methods 0.000 title claims abstract description 56
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 33
- 239000010935 stainless steel Substances 0.000 title claims abstract description 33
- 239000003595 mist Substances 0.000 title claims abstract description 32
- 239000007788 liquid Substances 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000005764 inhibitory process Effects 0.000 title abstract 3
- 239000002253 acid Substances 0.000 claims abstract description 104
- 239000006260 foam Substances 0.000 claims abstract description 24
- 238000005273 aeration Methods 0.000 claims abstract description 18
- 239000003112 inhibitor Substances 0.000 claims abstract description 12
- 235000021110 pickles Nutrition 0.000 claims description 42
- 238000005406 washing Methods 0.000 claims description 23
- 239000003795 chemical substances by application Substances 0.000 claims description 22
- 230000002401 inhibitory effect Effects 0.000 claims description 21
- 238000001914 filtration Methods 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 15
- 238000004140 cleaning Methods 0.000 claims description 12
- -1 polyethylene Polymers 0.000 claims description 12
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 8
- 239000004698 Polyethylene Substances 0.000 claims description 6
- 239000004743 Polypropylene Substances 0.000 claims description 6
- 229920003023 plastic Polymers 0.000 claims description 6
- 239000004033 plastic Substances 0.000 claims description 6
- 229920000573 polyethylene Polymers 0.000 claims description 6
- 229920001155 polypropylene Polymers 0.000 claims description 6
- 239000004800 polyvinyl chloride Substances 0.000 claims description 6
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 5
- 238000005215 recombination Methods 0.000 claims description 3
- 230000006798 recombination Effects 0.000 claims description 3
- 239000008399 tap water Substances 0.000 claims description 3
- 235000020679 tap water Nutrition 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 101100006584 Mus musculus Clnk gene Proteins 0.000 abstract 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000006396 nitration reaction Methods 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000010306 acid treatment Methods 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 239000000443 aerosol Substances 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Landscapes
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Cleaning By Liquid Or Steam (AREA)
Abstract
The invention discloses a pickling liquid circulated stainless steel pickling mist inhibition system and a pickling process thereof. The pickling liquid circulated stainless steel pickling mist inhibition system comprises a system body, an acid liquid delivery pipe, a steam delivery pipe, an acid liquid circulating pump, a mist inhibitor dosing and air dissolving pump and a compressed air delivery pipe, wherein the system body comprises a pickling tank, a microporous aeration head, an overflowing sloping plate, a filter mesh, a first mixing zone and a second mixing zone. Steam and acid liquid are rapidly mixed by the acid liquid circulating pump, so that the heating rate is increased remarkably; acid mist hardly escapes during pickling operation, so that the production environment is improved; in addition, due to a dense foam layer of the liquid surface of the pickling tank, the loss of the acid liquid and heat can be reduced effectively while the volatilization of the acid mist and water vapor is reduced, and the stainless steel pickling rate is increased remarkably.
Description
Technical field
The present invention relates to hard goods pickling circulation technology, the acid-washing stainless steel particularly relating to the circulation of a kind of pickle solution presses down mist system and acid cleaning process thereof.
Background technology
When stainless steel becomes various sheet material and section bar from hot rolling of steel billet, surface can by the O in air
2oxidation, produce black, yellow tight zone of oxidation, in order to improve stainless outward appearance and solidity to corrosion, the stainless steel after processing must carry out cleanup acid treatment.In stainless steel (special steel) pickling line, usually adopt nitration mixture (HNO
3+ HF) acid cleaning process.Mixing acid has very strong corrodibility and oxidisability, and the temperature of pickle solution is usually 40 ~ 80
oc, these propose very high requirement to the corrosion resisting property of pickling lines equipment and material.The stainless material form of pickling has band to wash, pipe is washed, plate is washed, line is washed, no matter the pickling of which kind of technique, and the pickling tank in stainless steel sulfuric acid refining production line is key equipment.
Because heating tube can not be arranged in pickling tank inside, usually steam is utilized to heat to pickle solution in one end of pickling tank.Because acid-washing stainless steel slot length is generally all greater than 10m, need longer warm-up time, particularly winter by natural diffuseness.The temperature of pickle solution also can reduce along with distributing of heat in acid cleaning process gradually simultaneously, must carry out continuing to heat.In nitration mixture acid cleaning process, because violent chemical reaction occurs for metal and metal oxide and strong acid, a large amount of acid aerosol state pollutents can be produced, be acid mist.Acid mist has the features such as instantaneous concentration is high, corrodibility is strong.In addition, after entering air, also can produce serious chimney " Huanglong " phenomenon, produce serious harm by healthy and other animals and plants of surrounding environment, the people.In order to reduce or slow down the volatilization of acid mist, current most enterprises adopts and add acid fog inhibitor in pickle solution, and the foam produced by tensio-active agent carries out surface coverage to pickle solution, thus plays and suppress acid mist.There is adding of agent difficulty in actually operating, disperse uneven, foam layer such as easily to break at the situation.In order to make foam layer continual and steady, usually adopt artificial multi-point adding, dosage of surfactant is comparatively large, and this just directly affects the processing pressure of follow-up pickling waste waters, more particularly containing the acid fog inhibitor of ammonia.In addition, along with the carrying out of Acid Rust Removalling Technics process, due to the consumption of acid, cause pickle solution concentration to reduce, when pickle solution concentration lower than 5% time, pickle solution must supplement in time.
Summary of the invention
The object of patent of the present invention overcomes the deficiency that existing acid cleaning process acid solution is difficult to circulating technology, and the acid-washing stainless steel providing a kind of pickle solution to circulate presses down mist system and acid cleaning process thereof.
The acid-washing stainless steel of pickle solution circulation presses down mist system and comprises system ontology, acid liquor delivery pipe, steam pipeline, acid cycle pump, inhibiting fog agent dosing air dissolved pump, blowpipe, and system ontology comprises pickling tank, micro porous aeration head, overflow swash plate, filtering net, the first mixing zone and the second mixing zone;
The first mixing zone, pickling tank, overflow swash plate, the second mixing zone is provided with in turn in system ontology, in first mixing zone, middle part is laterally provided with filtering net, micro porous aeration head is provided with in second mixing zone, first upper end, mixing zone is provided with acid liquor delivery pipe, steam pipeline is provided with below first mixing zone filtering net, be connected with in the middle part of the second mixing zone through acid cycle pump above first mixing zone filtering net, inhibiting fog agent dosing air dissolved pump is connected with acid cycle pump, and blowpipe is connected with micro porous aeration head.
The flow of described acid cycle pump is 0.1 ~ 5 times of pickling tank volume.The impeller material of described acid cycle pump is surface recombination tetrafluoroethylene.The material of described pickling tank is the plastic plate of polyethylene, polypropylene or reinforced polyvinyl chloride.Described inhibiting fog agent dosing air dissolved pump is Self-sucking gas/liquid mixing pump.The material of described micro porous aeration head is the plastics of polyethylene, polypropylene, reinforced polyvinyl chloride or tetrafluoroethylene, and micropore size is at 0.01-0.5mm.The gradient of described overflow swash plate becomes 20-60 with liquid level
o.The material of described filtering net is tetrafluoroethylene, and average mesh is 10-100 order.
The acid cleaning process that the acid-washing stainless steel that pickle solution circulates presses down mist system adds tap water in advance in pickling tank, and open the valve of acid liquor delivery pipe and steam pipeline, the acid solution in acid liquor delivery pipe is HNO
3and HF, according to the dosage of pickling tank Liquid level acid solution, and open acid cycle pump and inhibiting fog agent dosing air dissolved pump simultaneously, acid solution is made by acid cycle pump, steam and acid fog inhibitor mix and are rapidly heated rapidly in pipeline, the gas simultaneously dissolved in by inhibiting fog agent dosing air dissolved pump is discharged and produces a large amount of microbubble in pickling tank, stable foam layer can be formed rapidly at pickling tank liquid level, this foam layer keeps stable under acid cycle and micro porous aeration head discharge the effect of bubble, simultaneously, the circulation of acid solution makes the acid fog inhibitor added in pickling tank by inhibiting fog agent dosing air dissolved pump again to bubble rapidly, make foam uniform fold on pickle solution surface by the horizontal thrust of overflow swash plate, formed fine and close, stable foam layer.
When present invention process significantly can reduce pickling operation acid solution volatilization and reduce the generation of acid mist, substantially improve production environment.The loss of pickle solution heat can be reduced simultaneously, make pickle solution can keep constant temp for a long time, thus improve the efficiency of acid-washing stainless steel.Pickle solution completes short mix and heats in closed cycle system, possesses acid solution and inhibiting fog agent makeup function simultaneously, is a kind of efficient, clean and energy-conservation acid washing process for stainless steel.
Accompanying drawing explanation
Fig. 1 is that the acid-washing stainless steel of pickle solution circulation presses down mist system architecture schematic diagram;
In figure, pickling tank 1, acid liquor delivery pipe 2, steam pipeline 3, acid cycle pump 4, inhibiting fog agent dosing air dissolved pump 5, blowpipe 6, micro porous aeration head 7, overflow swash plate 8, mixing zone 11, filtering net 9, first mixing zone 10, second.
Embodiment
Present invention employs the acid washing process for stainless steel of pickle solution circulation, make acid solution, steam and acid fog inhibitor mix and be rapidly heated rapidly in pipeline by the circulation of pump.Air dissolved pump can make acid solution, steam and acid fog inhibitor mix rapidly in pipeline, and the gas simultaneously dissolved in discharges and produces a large amount of bubble in pickling tank.Acid solution, steam and acid fog inhibitor, under micro-pore aeration and release bubble, bubble rapidly.Make foam uniform fold on pickle solution surface by the horizontal thrust of overflow swash plate, the minute gas simultaneously produced in acid cleaning process also contributes to the stable of foam layer.Filtering net is set in one end of pickling tank, prevents the suspended substance in pickle solution and other impurity from entering air dissolved pump, in order to avoid cause the damage of pump.Stable, fine and close foam layer, significantly can reduce the volatilization of acid solution, reduces the generation of acid mist, can reduce the loss of pickle solution heat simultaneously, makes pickle solution keep constant temp, thus improves the efficiency of acid-washing stainless steel.Pickle solution completes short mix and heats in closed cycle system, possesses acid solution and inhibiting fog agent makeup function simultaneously.Do not have acid mist effusion in pickling operation process, substantially improve production environment, significantly improve acid-washing stainless steel speed simultaneously, be a kind of efficient, press down mist and energy-conservation acid-washing stainless steel system.
For a better understanding of the present invention, be described further below by accompanying drawing and concrete enforcement.
As shown in Figure 1, the acid-washing stainless steel of pickle solution circulation presses down mist system and comprises system ontology, acid liquor delivery pipe 2, steam pipeline 3, acid cycle pump 4, inhibiting fog agent dosing air dissolved pump 5, blowpipe 6, and system ontology comprises pickling tank 1, micro porous aeration head 7, overflow swash plate 8, filtering net 9, first mixing zone 10 and the second mixing zone 11;
The first mixing zone 10, pickling tank 1, overflow swash plate 8, second mixing zone 11 is provided with in turn in system ontology, first middle part in mixing zone 10 is laterally provided with filtering net 9, micro porous aeration head 7 is provided with in second mixing zone 11, first upper end, mixing zone 10 is provided with acid liquor delivery pipe 2, steam pipeline 3 is provided with below first mixing zone 10 filtering net 9, be connected with in the middle part of the second mixing zone 11 through acid cycle pump 4 above first mixing zone 10 filtering net 9, inhibiting fog agent dosing air dissolved pump 5 is connected with acid cycle pump 4, and blowpipe 6 is connected with micro porous aeration head 7.
The flow of described acid cycle pump 4 is 0.1 ~ 5 times of pickling tank 1 volume.The impeller material of described acid cycle pump 4 is surface recombination tetrafluoroethylene.The material of described pickling tank 1 is the plastic plate of polyethylene, polypropylene or reinforced polyvinyl chloride.Described inhibiting fog agent dosing air dissolved pump 5 is Self-sucking gas/liquid mixing pump.The material of described micro porous aeration head 7 is the plastics of polyethylene, polypropylene, reinforced polyvinyl chloride or tetrafluoroethylene, and micropore size is at 0.01-0.5mm.The gradient of described overflow swash plate 8 becomes 20-60 with liquid level
o.The material of described filtering net 9 is tetrafluoroethylene, and average mesh is 10-100 order.
The acid cleaning process that the acid-washing stainless steel that pickle solution circulates presses down mist system is: in pickling tank 1, add tap water in advance, and open the valve of acid liquor delivery pipe 2 and steam pipeline 3, the acid solution in acid liquor delivery pipe 2 is HNO
3and HF, according to the dosage of pickling tank 1 Liquid level acid solution, and open acid cycle pump 4 and inhibiting fog agent dosing air dissolved pump 5 simultaneously, acid solution, steam and acid fog inhibitor is made to mix and be rapidly heated rapidly in pipeline by acid cycle pump 4, through mixing and the Circulation of recycle pump, pickle solution temperature can rise to 40 ~ 80 fast
oc, now can reduce or the valve of steam off transfer lime 3, the gas simultaneously dissolved in by inhibiting fog agent dosing air dissolved pump 5 is discharged and produces a large amount of microbubble in pickling tank 1, stable foam layer can be formed rapidly at pickling tank 1 liquid level, this foam layer keeps stable under acid cycle and micro porous aeration head 7 discharge the effect of bubble, simultaneously, the circulation of acid solution makes the acid fog inhibitor added in pickling tank by inhibiting fog agent dosing air dissolved pump 5 again to bubble rapidly, make foam uniform fold on pickle solution surface by the horizontal thrust of overflow swash plate 8, formed fine and close, stable foam layer.Hang in undressed stainless steel pipe afterwards, have no obvious acid mist above pickling tank and produce, because the insulation effect pickle solution of foam layer can keep constant temp for a long time.Take out stainless steel tube after pickling, its surface cleaning is clean, and can form the sub-photo structure of silvery white.When pickle solution temperature is lower than design temperature 5
oduring C, open the valve of steam pipeline 3, suitably heat.When pickle solution concentration lower than 5% time, acid liquor delivery pipe 2 supplements in time the acid consumed.
As can be seen from experimental result, circulation technology substantially increases the rate of warming of pickle solution, and about 8min can reach 70
oC.Stable, fine and close foam layer plays a very good insulation effect, and above foam layer, temperature is significantly lower than pickle solution temperature 20
oc ~ 24
oc, this illustrates the loss decreasing pickle solution heat, and the speed of pickling simultaneously improves more than 100%.The NO of non-foam layer distance pickling tank liquid level 20cm and 100cm is determined respectively in specific implementation process
xconcentration, result shows, and has foam layer significantly can suppress the generation of acid mist, distance liquid level 20cm average N O
xsource strength concentration reduces more than 82%.
Claims (8)
1. the acid-washing stainless steel of a pickle solution circulation presses down mist system, it is characterized in that comprising system ontology, acid liquor delivery pipe (2), steam pipeline (3), acid cycle pump (4), inhibiting fog agent dosing air dissolved pump (5), blowpipe (6), system ontology comprises pickling tank (1), micro porous aeration head (7), overflow swash plate (8), filtering net (9), the first mixing zone (10) and the second mixing zone (11);
The first mixing zone (10) is provided with in turn in system ontology, pickling tank (1), overflow swash plate (8), second mixing zone (11), in first mixing zone (10), middle part is laterally provided with filtering net (9), micro porous aeration head (7) is provided with in second mixing zone (11), first mixing zone (10) upper end is provided with acid liquor delivery pipe (2), first mixing zone (10) filtering net (9) below is provided with steam pipeline (3), first mixing zone (10) filtering net (9) top is connected with the second mixing zone (11) middle part through acid cycle pump (4), inhibiting fog agent dosing air dissolved pump (5) is connected with acid cycle pump (4), blowpipe (6) is connected with micro porous aeration head (7).
2. the acid-washing stainless steel of a kind of pickle solution circulation according to claim 1 presses down mist system, it is characterized in that the impeller material of described acid cycle pump (4) is surface recombination tetrafluoroethylene.
3. the acid-washing stainless steel of a kind of pickle solution circulation according to claim 1 presses down mist system, it is characterized in that the material of described pickling tank (1) is the plastic plate of polyethylene, polypropylene or reinforced polyvinyl chloride.
4. the acid-washing stainless steel of a kind of pickle solution circulation according to claim 1 presses down mist system, it is characterized in that described inhibiting fog agent dosing air dissolved pump (5) is Self-sucking gas/liquid mixing pump.
5. the acid-washing stainless steel of a kind of pickle solution circulation according to claim 1 presses down mist system, it is characterized in that the material of described micro porous aeration head (7) is the plastics of polyethylene, polypropylene, reinforced polyvinyl chloride or tetrafluoroethylene, micropore size is at 0.01-0.5mm.
6. the acid-washing stainless steel of a kind of pickle solution circulation according to claim 1 presses down mist system, it is characterized in that the gradient of described overflow swash plate (8) becomes 20-60 with liquid level
o.
7. the acid-washing stainless steel of a kind of pickle solution circulation according to claim 1 presses down mist system, and it is characterized in that the material of described filtering net (9) is tetrafluoroethylene, average mesh is 10-100 order.
8. one kind uses acid-washing stainless steel as claimed in claim 1 to press down the acid cleaning process of mist system, it is characterized in that adding tap water in advance in pickling tank (1), open the valve of acid liquor delivery pipe (2) and steam pipeline (3), the acid solution in acid liquor delivery pipe (2) is HNO
3and HF, according to the dosage of pickling tank (1) Liquid level acid solution, and open acid cycle pump (4) and inhibiting fog agent dosing air dissolved pump (5) simultaneously, acid solution is made by acid cycle pump (4), steam and acid fog inhibitor mix and are rapidly heated rapidly in pipeline, the gas simultaneously dissolved in by inhibiting fog agent dosing air dissolved pump (5) is discharged and produces a large amount of microbubble in pickling tank (1), stable foam layer can be formed rapidly at pickling tank (1) liquid level, this foam layer keeps stable under acid cycle and micro porous aeration head (7) discharge the effect of bubble, simultaneously, the circulation of acid solution makes the acid fog inhibitor added in pickling tank by inhibiting fog agent dosing air dissolved pump (5) again to bubble rapidly, make foam uniform fold on pickle solution surface by the horizontal thrust of overflow swash plate (8), formed fine and close, stable foam layer.
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| CN201310361064.XA CN103451669B (en) | 2013-08-19 | 2013-08-19 | Pickling liquid circulated stainless steel pickling mist inhibition system and pickling process thereof |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103882462A (en) * | 2014-03-18 | 2014-06-25 | 浙江大学 | Stainless steel pickling system and method adopting pickling solution without nitric acid |
| CN104152931B (en) * | 2014-07-22 | 2016-03-30 | 浙江大学 | A kind of whirlwind-type acid-washing stainless steel system and method thereof |
| CN104404551A (en) * | 2014-12-22 | 2015-03-11 | 青岛锻艺金属有限公司 | Stainless steel acid pickling technology |
| JP6586392B2 (en) * | 2016-04-27 | 2019-10-02 | Ｐｒｉｍｅｔａｌｓ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｊａｐａｎ株式会社 | Pickling equipment |
| CN106011902A (en) * | 2016-07-06 | 2016-10-12 | 湖北大帆金属制品有限公司 | Pickling tank |
| CN108381357A (en) * | 2018-04-16 | 2018-08-10 | 江山海维科技有限公司 | A kind of efficient corrosion steel polishing cleaning device |
| CN108468055A (en) * | 2018-04-16 | 2018-08-31 | 江山海维科技有限公司 | A kind of safe and efficient corrosion acid washing rolled steel equipment |
| CN115386890A (en) * | 2022-08-22 | 2022-11-25 | 河南神恒实业有限公司 | Automatic casting part pickling device and pickling process |
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| CN203498477U (en) * | 2013-08-19 | 2014-03-26 | 浙江大学 | Stainless steel acid-pickling mist suppression system with circulating acid-pickling solution |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2564552B2 (en) * | 1987-06-08 | 1996-12-18 | 住友重機械工業株式会社 | Pickling equipment for strip steel |
| JP2966991B2 (en) * | 1991-12-28 | 1999-10-25 | 住友重機械工業株式会社 | Pickling equipment for strip steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN101775607A (en) * | 2010-01-27 | 2010-07-14 | 中国瑞林工程技术有限公司 | Forced circulation pickling method of copper and copper alloy tubes, rods and wires |
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| CN203498477U (en) * | 2013-08-19 | 2014-03-26 | 浙江大学 | Stainless steel acid-pickling mist suppression system with circulating acid-pickling solution |
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