CN106400096A - Strip steel electrolysis descaling process and device - Google Patents
Strip steel electrolysis descaling process and device Download PDFInfo
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- CN106400096A CN106400096A CN201610956481.2A CN201610956481A CN106400096A CN 106400096 A CN106400096 A CN 106400096A CN 201610956481 A CN201610956481 A CN 201610956481A CN 106400096 A CN106400096 A CN 106400096A
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- electrode
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- electrolysis
- pair
- electrolytic cell
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Classifications
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F1/00—Electrolytic cleaning, degreasing, pickling or descaling
- C25F1/02—Pickling; Descaling
- C25F1/04—Pickling; Descaling in solution
- C25F1/06—Iron or steel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F7/00—Constructional parts, or assemblies thereof, of cells for electrolytic removal of material from objects; Servicing or operating
Abstract
The invention provides a strip steel electrolysis descaling process and device and relates to the technical field of steel part surface treatment. The strip steel electrolysis descaling process includes the following electrolysis steps that a neutral electrolyte, namely a Na2SO4 solution, is contained in an electrolytic cell, and the pH of the electrolyte is regulated to be 4-7.0; a plurality of pairs of electrodes are arranged in the electrolytic cell, each pair of electrodes is the same in polarity and arranged up and down, and the pairs of electrodes are divided into positive electrode pairs and negative electrode pairs; and strip steel penetrates through the space between each pair of electrodes, the pair of electrodes at the tail end of the strip discharging end is negative electrodes, and the strip steel is relatively a positive electrode, so that electrolysis descaling is carried out. The electrolysis time is shorter than the acid pickling time, the production is correspondingly increased, corrosion is avoided, environment pollution is eliminated or weakened, using is safe, and the cost is low.
Description
Technical field
The present invention relates to technical field of steel piece surface treatment.
Background technology
" de-scaling " in Plate Production typically refers to remove the metal oxide of surface of steel plate, to ensure the surface matter of steel plate
Amount.
The generation of steel-plate iron oxide scale scale：
During Plate Production, have three technical process and can produce oxide skin：
(1) slab, before hot rolling, heats in heating furnace and is incubated（1200-1250℃）, produce once oxidation skin.Once oxidation
Skin is made up of fine and close top layer and loose internal layer.Top layer is Fe2O3、Fe3O4And FeO, and internal layer FeO accounts for 14%-16%,
Remaining is Fe3O4And pore.
(2) hot rolling slab from heating furnace out after, through water under high pressure remove once oxidation skin after carry out roughing.Roughing in the short time
With create secondary oxidation skin in finishing stands, secondary oxidation skin is red squama layer, by wustite（FeO）, bloodstone（Fe2
O3）Deng particulate composition, this oxidated layer thickness is relatively thin, and steel plate is little with the interfacial stress of squama, so fissility is poor.Open in finish rolling
During the beginning and finishing pass gap is removed with high pressure water descaling device, and scale removal effect depends on the pressure of water under high pressure, actual hitting power
And the factor such as arrangement of nozzles.
(3) produce three oxide skins in the cooling procedure after finish rolling, and retain to room temperature state.Hot-rolled sheet coil product surface matter
Oxide skin in amount is essentially all three oxide skins.If secondary oxidation iron sheet can not remove in the operation of rolling, can roll
Form iron scale press-in defect, this iron scale assumes pitchy, little navicular, is distributed in defect loose sand shape during system
Surface of steel plate.Under conditions of continuous coo1ing, due to by factors such as finishing temperature, final cooling temperature, red temperature and cooling velocities
Impact, may eventually form the oxide layers of different compositions；General structure consists of：The Fu Shi body of innermost layer（Fe3O4Solid with FeO
Solution）, the Fe in intermediate layer3O4With outermost Fe2O3.In continuous cooling process, oxide skin constantly changes hot-rolled carbon steel
Become, the fault of construction of oxide skin mainly has：Oxide skin bubbling, sliding lead to oxide skin partial fracture and Fe3O4Analysis with Fe particle
Go out.
Iron scale（Scale）Harm：
(1) iron scale can be pressed into band steel matrix, impact cold-reduced sheet surface quality and processing characteristics in rolling.
(2) enter the emulsion system of cooling and lubricating after iron scale crushes, damage equipment simultaneously shortens emulsion and uses the longevity
Life.
(3) iron scale and various impurity are liable to stick to immerse roller surface, can damage roll, shadow in the follow-up operation of rolling
Ring strip quality.
Hot rolled steel plate, as the raw material of cold-strip steel, needs to carry out de-scaling operation before cold rolling.Technique of scale removal is to steel plate matter
Amount plays very important effect.In order to eliminate iron scale, generally there is following several method：
（1）Acid wash
Chlorohydric acid pickling is adopted to process the iron scale on surface, chemically the principle of pickling understands, because of chemical reaction outside in
Carry out, the oxide skin(coating) thin and thick of steel surface differs, may react incomplete at thick point, pickling time need to be lengthened；Steel at thin point
The long-time contact with acid of plate matrix is easily corroded, that is, cause peracid etched the matrix or deficient pickling impermeable, so the steel plate after pickling
Easily " pit " occurs（Can be observed under the microscope）.Because of the corrosivity of acid solution, spare part rapid wear, increase maintenance, the cost of overhaul is used.Especially
It is groove lid, and its structure is that box hat is lined, and liner by the black slag that comes off after acid mist corrosion, falls on steel plate, affects surface for a long time
Quality, and increase maintenance cost.In addition, in pickling processes, acid solution requires heat to 60OLeft and right, acid solution produces after the heating
Acid mist, acid mist can be dispersed in the air in processing procedure and produce air pollution.Harm operator and surrounding resident health；Useless
If acid, waste water drain into sewer, corrode factory building foundation, affect environmental sanitation, polluted source.Acid solution is when heating is using one section
Between can produce low acid spent acid, current spent acid is difficult to process.Be exactly acid regeneration equipment, processing cost also costly, on
A set of acid regeneration equipment investment is wanted between 6 million to one thousand ten thousand, and three wastes problem does not reach environmental protection standard yet, or gives ring
Severe contamination is caused in border.
At present China is Pickling Descaling method using traditional chemical method mostly, will to Cold-strip Steel Surface quality with market
The more and more higher asked, traditional chemical method can not meet the requirement of special user, and exists in pickling production process
De-scaling efficiency is low, high cost, seriously polluted the shortcomings of.Have been used up acid wash for many years and remove materials statement surface oxidized skin, often
Year will consume kiloton spent acid.In acid cleaning process, a large amount of acid mists escape, and harm operator and surrounding resident are healthy, spent acid,
Discharge of wastewater enters sewer, corrodes factory building foundation, affects environmental sanitation, polluted source.In view of this descaling method efficiency low, become
The shortcomings of this is high, seriously polluted.Use is prohibited by country.
(2), sand-blast
Shot-peening is in sandblasting again, and this technology starts from the U.S. of 19 century 70s.It is the gases at high pressure using air compressor output,
Make abrasive material (sand or ball) with very high speed directive belt steel surface by nozzle, using impact and the rubbing action of abrasive material, reach
Remove the purpose of firecoat and other dirts.During this method operation, dust flies upward everywhere, seriously polluted；Not only affect field operation work
People's is healthy, and abrasive material consumes greatly simultaneously, and how waste material is it is difficult to process.In addition, the effect of Sand blasting descaling is less desirable.Greatly
Amount it was verified that the surface of steel plate after blasting treatment seems good, but when cold rolling, the strip of below 0.5mm is easy
Broken belt or surface quality problems occur.Because carbon dust is also remained on the surface of steel plate after blasting treatment.So cold rolling
During below 0.5mm strip, occur increasing roll-force, damage roll, cold rolling strip version type out is bad, in hot dip, zinc amount is high,
And coating easily comes off in later stage use.Can not be in this way therefore require to flat cold-rolled sheet and clad plate.
(3) ball blast method
Ball blast technology decades more late than blasting technology, are to make abrasive grain obtain very big centrifugation using the impeller of high-speed rotation
Power, abrasive material throws to belt steel surface at a relatively high speed from ramming head, to remove firecoat and other dirts.Although ball blast method de-scaling subtracts
Lack dust pollution, reduced noise, but ball blast method lossy is very high, impeller and lining steel plate etc. are more easy to wear, to its material
Have high demands;Additionally, dust, abrasive reclaiming piece-rate system are complicated, seriously polluted.Therefore this method also cannot be promoted.
In sum, this several descaling method all cannot be promoted or on the verge of being replaced, and this requires in the urgent need to a kind of section
The descaling method of energy environmental protection.
Content of the invention
Present invention solves the technical problem that there is provided a kind of steel plate electrolysis descaling process, electrolysis time is compared with pickling time
Short, accordingly improve yield, corrosion-free, eliminate or reduce environmental pollution, using safety, low cost.
The technical scheme is that：A kind of strip electrolysis descaling process is it is characterised in that include following electrolysis step：
（1）Electrolysis：Neutral electrolyte Na is filled in electrolytic cell2SO4Solution, electrolyte adjustment is 4 7.0 scopes in pH, electricity
Be disposed with solution groove some to electrode, each pair polarity of electrode is identical, each pair is divided and is arranged above and below, and some is divided into negative electrode to electricity to electrode
, to electrode, strip passes through between each pair electrode for pole and anode, and going out band edge most end a pair of electrodes is negative electrode, and strip is opposite anode,
Carry out being electrolysed de-scaling.Strip itself is not charged, and when to polarity of electrode for anode, strip is opposing cathode, when to polarity of electrode
During for negative electrode, strip is opposite anode.
Further, a kind of described strip electrolysis descaling process is it is characterised in that also include step（2）Cleaning.
Further, a kind of described strip electrolysis descaling process is it is characterised in that also include step（3）Dry.
Preferably, described electrode sheet material is Silel cast iron.
Preferably, described some electrode is staggered for anode and cathode.
Preferably, described some every to configuration of electrodes 4 to for one group, is 3-5 in a group of the first end of groove and end
Right, each pair upper/lower electrode polarity is identical, is staggered for cathode and anode between group and group.Strip itself is not charged, when to polarity of electrode
During for anode, strip is opposing cathode, and when to polarity of electrode for negative electrode, strip is opposite anode.
Preferably, described some be 30-40 pair to electrode, each pair electrode spacing be 1.5-2m, upper and lower die opening 280-
320mm, electrode thickness 40mm, upper/lower electrode length is adapted to strip width, and power supply source is 4500A/24V-30V direct current.
Preferably, described electrolyte adopts 15% 25% Na2SO4Solution, 80 90 DEG C of temperature, metal ion in solution
Content is less than 25 g/L i.e. wherein hexavalent chromium content and is less than 5 g/L；Cathode-current density 10 19A/dm2, negative electrode
Process time 9 14s.
A kind of strip is electrolysed the strip electrolytic descaling device used by descaling process it is characterised in that including strip coil of strip uncoiling
Power traction material machine level(l)ing machine electrolytic cell, is provided with strip guiding and support roller between electrode in electrolytic cell.
Further, described cell body there is groove lid and be provided with air intake duct exhaust mist cleaning system；Electrolytic cell contour structures are
Ship shape cell body, backward middle part tilts trench bottom in the past.
Further, a kind of described strip electrolytic descaling device is it is characterised in that also include cleaning device after electrolytic cell
And drying unit, described cleaning device includes scrubbing unit and high pressure water spray machine, and described scrubbing unit includes brush roll and line with rubber counter-pressure cylinder
Arrange in vertical type, top is disposed with sparge pipe, there is water storage recovery system lower section；Described high pressure water spray machine includes spray gun, water
Case, water circulation system and hot-water heating system, 85 DEG C of wash water temperature, water circulation system includes water-circulating pump, flow 15m3/h,
Pressure 0.5MPa；Described drying unit is air flow dryer.
The positive effect of the present invention is that electrolysis time is short compared with pickling time, accordingly improves yield, corrosion-free, eliminate or
Reduce environmental pollution, using safety, low cost.
All of strip de-scaling is all carried out with neutral salt electrolysis, Neutral Electrolysis salt de-scaling compensate for traditional underpickling it
Place, outstanding behaviours is in the following aspects.
(1) from electrolysis principle, during the oxide layer dissolving of belt steel surface, it is inside and outside uniformly carried out, and is not in
The plate quality problem that " peracid " or deficient acid " causes, that is, be not in " pit ".Meanwhile, electrolysis time is short compared with pickling time, phase
Yield should be improve.
(2) neutral electrolyte selects Na2S04Solution, it is cheap and easy to get, uses security insurance.Electrolyte in pH is
Use in the range of 4.5 7.0, pH value is too high or too low, can be by adding Na2S04Or NaOH is adjusted to range.
(3) because electrolyte is in neutrality, so not having etching problem, therefore maintenance cost is low.Because Neutral Electrolysis only exist
Electric current by when just occur, so after failure of current, belt steel surface oxide layer and its basal plane all will not suffer erosion, in
Under disconnected ruuning situation, strip can rest in groove not impairedly.
(4)Na2SO4Use greatly reduce HNO3Usage amount, due to Na2SO4Price be less than HNO3, plus
Na2SO4Be not involved in electrode reaction, except in addition to drag that loss is outer on a small quantity not to consume, therefore de-scaling cost substantially reduces.
(5) during neutral salt electrolysis, there is no the discharge of acid mist, spent acid and low sour water, be inherently eliminated or reduce
Environmental pollution.
It is described further below in conjunction with an embodiment, but not as a limitation of the invention.
Brief description
Fig. 1 is the cell construction schematic diagram of an embodiment.
Fig. 2 is the structural representation of a pair of electrodes in Fig. 1.
In figure, 1, strip；2 slewing rollers；3rd, sinking roller；4th, guide carrying roller；5th, upper/lower electrode；6th, circulating pump；7 electrolyte；
8th, cell body；9th, leakage fluid dram；10th, purify fog discharge system.
Specific embodiment
Embodiment 1：This strip electrolysis descaling process comprises the following steps：
Electrolysis：Neutral electrolyte Na is filled in electrolytic cell2S04Solution, electrolyte adjustment is 4 7.0 scopes in pH, electrolytic cell
In be disposed with some to electrode, each pair polarity of electrode is identical, each pair is divided and is arranged above and below, and strip passes through between each pair electrode, described
Some electrode is staggered for cathode and anode.Strip itself is not charged, and when to polarity of electrode for anode, strip is relatively
Negative electrode, when to polarity of electrode for negative electrode, strip is opposite anode.Going out band edge most end a pair of electrodes is negative electrode, and strip is relatively
Anode, carries out being electrolysed de-scaling；Described electrode sheet material is Silel cast iron.Described some every to configuration of electrodes 4 to for one group, in groove
First end and one group of end be 3-5 pair, each pair upper/lower electrode polarity is identical, is staggered for cathode and anode between group and group.Described
Some right for 38 to electrode, each pair electrode spacing is 1.5-2m, upper and lower die opening 280-320mm, electrode thickness 40mm, upper/lower electrode
Length is adapted to strip width, and power supply source is 4500A/24V-30V direct current.Described electrolyte adopts 15% 25% Na2SO4Molten
Liquid, 80 90 DEG C of temperature, metal ion in solution content is less than 25 g/L i.e. wherein hexavalent chromium content and is less than 5 g/L
；Cathode-current density 10 19A/dm2, cathode treatment time 9 14s.
Negative and positive polarity, using alternately arranged, its objective is negative " loose " effect to combine with anodic dissolution effect.
The electrode going out band edge is negative electrode, and now strip could " be polished " as opposite anode, only in this way strip.
Embodiment 2：Some to configuration of electrodes for every 4 to for one group, every group of polarity is identical, between group and group be yin, yang
Pole is staggered.Remaining is with embodiment 1.
Embodiment 3：This strip is electrolysed descaling process, step（1）With embodiment 1, including step（2）Cleaning and step（3）
Dry.
Embodiment 4：Strip electrolytic descaling device, draws material machine level(l)ing machine electrolytic cell including strip steel roll opener,
It is provided with strip guiding and support roller in electrolytic cell between electrode, also include tension roller -- cleaning device drying section coiling machine steel
Volume.Groove lid is had on described cell body and is provided with air intake duct exhaust mist cleaning system；Electrolytic cell contour structures are ship shape cell body, trench bottom
In the past backward middle part tilts.Cleaning device and drying unit is also included after electrolytic cell；Described cleaning device includes scrubbing unit and height
Pressure sprinkler, it is in that vertical type is arranged that described scrubbing unit includes brush roll and line with rubber counter-pressure cylinder, and top is disposed with sparge pipe, and there is water lower section
Storage recovery system；Described high pressure water spray machine includes spray gun, water tank, water circulation system and hot-water heating system, wash water temperature 85
DEG C, water circulation system includes water-circulating pump, flow 15m3/ h, pressure 0.5MPa；Described drying unit is air flow dryer.
Claims (10)
1. a kind of strip electrolysis descaling process is it is characterised in that include electrolysis step：
Electrolysis：Neutral electrolyte Na is filled in electrolytic cell2S04Solution, electrolyte adjustment is 4 7.0 scopes in pH, in electrolytic cell
Be disposed with some to electrode, each pair polarity of electrode is identical, each pair is divided and is arranged above and below, and some electrode is divided into cathodic counter electrode and sun
Extremely to electrode, steel band passes through between each pair electrode, and going out band edge most end a pair of electrodes is negative electrode, and strip is relative anode, carries out
Electrolysis de-scaling.
2. strip electrolysis descaling process according to claim 1 is it is characterised in that also include step（2）Cleaning and step
（3）Dry.
3. strip electrolysis descaling process according to claim 1 is it is characterised in that described electrode sheet material is Silel cast iron.
4. strip according to claim 1 be electrolysed descaling process it is characterised in that described some be cathode and anode to electrode
It is staggered.
5. strip according to claim 4 electrolysis descaling process is it is characterised in that described some every to configuration of electrodes 4
To for one group, one group in the first end of groove and end is 3-5 pair, and each pair upper/lower electrode polarity is identical, is cathode and anode between group and group
It is staggered.
6. strip according to claim 5 electrolysis descaling process it is characterised in that described some be 30-40 pair to electrode,
Each pair electrode spacing is 1.5-2m, upper and lower die opening 280-320mm, electrode thickness 40mm, and upper/lower electrode length is fitted with strip width
Join, power supply source is 4500A/24V-30V direct current.
7. strip according to claim 1 electrolysis descaling process is it is characterised in that described electrolyte adopts 15% 25%
Na2SO4Solution, 80 90 DEG C of temperature, it is little that metal ion in solution content is less than 25 g/L i.e. wherein hexavalent chromium content
In 5 g/L；Cathode-current density 10 19A/dm2, cathode treatment time 9 14s.
8. a kind of strip according to claim 1,4,5,6 or 7 is electrolysed the descaling device used by descaling process, and its feature exists
Draw material machine level(l)ing machine electrolytic cell in including steel band steel roll opener, be provided with steel band guiding in electrolytic cell between electrode and support
Roller.
9. descaling device according to claim 8 is it is characterised in that having groove lid and being provided with air intake duct exhaust on described cell body
Mist cleaning system；Electrolytic cell contour structures are ship shape cell body, and backward middle part tilts trench bottom in the past.
10. descaling device according to claim 8 is it is characterised in that also including cleaning device and drying dress after electrolytic cell
Put, described cleaning device includes scrubbing unit and high pressure water spray machine, it is in vertical type that described scrubbing unit includes brush roll and line with rubber counter-pressure cylinder
Arrangement, top is disposed with sparge pipe, and there is water storage recovery system lower section；Described high pressure water spray machine includes spray gun, water tank, water circulation
System and hot-water heating system, 85 DEG C of wash water temperature, water circulation system includes water-circulating pump, flow 15m3/ h, pressure
0.5MPa；Described drying unit is air flow dryer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610956481.2A CN106400096A (en) | 2016-10-27 | 2016-10-27 | Strip steel electrolysis descaling process and device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610956481.2A CN106400096A (en) | 2016-10-27 | 2016-10-27 | Strip steel electrolysis descaling process and device |
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| CN106400096A true CN106400096A (en) | 2017-02-15 |
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| CN201610956481.2A Pending CN106400096A (en) | 2016-10-27 | 2016-10-27 | Strip steel electrolysis descaling process and device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108505106A (en) * | 2018-06-15 | 2018-09-07 | 邢立杰 | Ordinary carbon steel strip is electrolysed de-scaling production system |
| CN108707959A (en) * | 2018-04-08 | 2018-10-26 | 湖北大学 | A kind of neutral environmentally friendly electrochemistry rust remover and technique for applying |
| CN110230087A (en) * | 2019-02-18 | 2019-09-13 | 柴霄渊 | A method of electrolysis removes steel strip surface squama |
| CN116516460A (en) * | 2022-01-24 | 2023-08-01 | 湖南天童环保有限公司 | Process and device for electrocatalytic descaling agent for strip steel |
-
2016
- 2016-10-27 CN CN201610956481.2A patent/CN106400096A/en active Pending
Non-Patent Citations (2)
| Title |
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| 于宝补 等: "不锈钢带采用中性电解除鳞", 《重型机械》 * |
| 原金钊: "中性电解除鳞在不锈钢酸洗中的应用", 《材料保护》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108707959A (en) * | 2018-04-08 | 2018-10-26 | 湖北大学 | A kind of neutral environmentally friendly electrochemistry rust remover and technique for applying |
| CN108505106A (en) * | 2018-06-15 | 2018-09-07 | 邢立杰 | Ordinary carbon steel strip is electrolysed de-scaling production system |
| CN110230087A (en) * | 2019-02-18 | 2019-09-13 | 柴霄渊 | A method of electrolysis removes steel strip surface squama |
| CN116516460A (en) * | 2022-01-24 | 2023-08-01 | 湖南天童环保有限公司 | Process and device for electrocatalytic descaling agent for strip steel |
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