CN1730712A - Method for removing zinc slag from hot galvanizing liquid - Google Patents
Method for removing zinc slag from hot galvanizing liquid Download PDFInfo
- Publication number
- CN1730712A CN1730712A CN 200510028882 CN200510028882A CN1730712A CN 1730712 A CN1730712 A CN 1730712A CN 200510028882 CN200510028882 CN 200510028882 CN 200510028882 A CN200510028882 A CN 200510028882A CN 1730712 A CN1730712 A CN 1730712A
- Authority
- CN
- China
- Prior art keywords
- cadmia
- zinc
- zinc liquid
- liquid
- vitrified pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Coating With Molten Metal (AREA)
Abstract
The invention relates to a method for removing zinc slag from hot galvanizing liquid by utilizing the difference of electrical conductivity between zinc slag and zinc liquid, the method comprises exerting electric-magnetic force field through direct or induction modes, building up a pressure gradient in zinc liquid within the ceramic tube, thus bringing directional emigration to the zinc slag with poor conductivity under the action of electromagnetic extrusion pressure exerted by the ambient zinc liquid, as a result, the zinc slag is trapped onto the walls of the ceramic tube.
Description
Technical field
What the present invention relates to is a kind of purifying method of Metal smelting technical field, particularly a kind of method of removing cadmia in the hot galvanizing liquid.
Background technology
Pot galvanize is to use general and the most effective technological measure in the steel anti-corrosion method up to now.The hot-dip galvanizing sheet steel of modernization continuous hot galvanizing explained hereafter is widely used in light industry, household electrical appliances, building and automobile industry.Particularly in recent years, along with the develop rapidly of automotive industry, automobile constantly increases with the demand of hot-dip galvanizing sheet steel.And auto sheet is except the requirement of aspects such as solidity to corrosion, intensity, deep drawing quality, and great surface quality also is its primary condition that must possess.Cadmia in the hot galvanizing liquid is the greatest factor that influences the galvanized sheet surface quality.Cadmia be the band steel in hot galvanizing process because the dissolving of base steel and and fusion Zn or and zinc liquid in reaction at high temperature forms between the Al that adds Fe-Zn system or Fe-Al series intermetallic compound, hardness is greater than zinc coating.Different according to composition, structure, density and size, cadmia can be different states such as end slag, face slag and scum silica frost in zinc liquid.The formation of cadmia not only consumes a large amount of zinc, also can have a strong impact on its surface quality in case deposit or stick on sinking roller or the steel plate, therefore avoids the cadmia defective very crucial for the production of high quality heat zinc coating plate.At present, mainly take the way of " preventing " at cadmia, replace irony zinc pot etc. as processing parameters such as strictness control zinc bath temperature and immersion plating time, employing induction heating or internal heating pottery zinc pot, purpose is to suppress dissolving and the Fe-Zn speed of response of Fe, reduces the formation of cadmia from the source.In case and after cadmia formed, modal measure was to fish for the face slag by craft or mechanism from zinc liquid surface.It is not only powerless to hazardness big end slag and scum silica frost to drag for slag, also unavoidably is entrained with a large amount of pure zinc with cadmia, causes the huge waste of these narrow resources of zinc.
Through the literature search of prior art is found, United States Patent (USP) " slagging-off of coating production line " (DrossRemoval on Coating Lines), the patent No. is US6187257 B1, this patent disclosure a kind of method and device that utilizes magnet to remove slag in the plating bath.This method utilize the magnetic of slag realize its with nonmagnetic plating bath between separate.But since in the cadmia except that the face slag Fe content all be lower than 12wt.%, at high temperature magnetic a little less than, so remove efficient and be subjected to considerable restraint.
Summary of the invention
The objective of the invention is to overcome deficiency of the prior art, a kind of electromagnetic purification method of removing cadmia in the hot galvanizing liquid is provided, cadmia in the hot galvanizing liquid was just effectively removed in the very first time that forms, avoid its deposition or be adhered on zinc-plated roller or the steel plate, with the remarkable surface quality of improving heat zinc coating plate.
The present invention is achieved through the following technical solutions, the present invention utilize cadmia and zinc liquid on electroconductibility than big-difference, apply electromagnetic force field by direct or induced mode, set up certain pressure gradient in the zinc liquid in vitrified pipe, make the cadmia of poorly conductive wherein be subjected to the effect of the electromagnetic pinch force that zinc liquid on every side bestows and directional migration takes place, be trapped in the vitrified pipe wall, thereby reach the purpose of removing cadmia.
Below the present invention is further described, step is as follows:
(1) make zinc liquid continuously by one or a branch of circle or rectangular ceramic pipe by the mobile of zinc liquid in the zinc pot or employing electromagnetic pump;
(2) in vitrified pipe, feed direct current and also apply one and the vertical steady magnetic field of the sense of current simultaneously, or apply alternating magnetic field by the coaxial solenoid coil coil, or apply travelling-magnetic-field by linear motor, make the zinc liquid of vitrified pipe inside be subjected to electromagnetic force effect perpendicular to the vitrified pipe wall;
(3) cadmia in the zinc liquid is subjected to the effect of the electromagnetic pinch force that zinc liquid on every side bestows, and moves in the opposite direction along the electromagnetic force side that is subjected to zinc liquid, is hunted down up to migrating to the vitrified pipe wall;
(4) vitrified pipe of cadmia is caught in periodic replacement, removes cadmia.
The direction of electromagnetic pinch force is opposite with the electromagnetic force direction that zinc liquid is subjected to, and size is directly proportional with the electromagnetic force that equal-volume zinc liquid is subjected to.By changing the size of electromagnetic force, can change the travelling speed of cadmia and remove efficient.
Because the zinc liquid in the zinc pot flows into vitrified pipe continuously, the cadmia that forms in the hot galvanizing process also enters in the pipe with zinc liquid.In the process of zinc liquid circulation, cadmia is owing to the effect of electromagnetic field migration takes place and constantly is deposited on the vitrified pipe wall.Like this, hot galvanizing liquid is purified continuously, and wherein most of cadmia was removed in the very first time that forms, and reduces the possibility that produces the cadmia defective greatly.
The present invention has substantive distinguishing features and marked improvement, by applying orthogonal direct current and steady magnetic field or applying alternating magnetic field, cadmia in the hot galvanizing liquid was just effectively removed in the very first time that forms, avoid its deposition or be adhered on zinc-plated roller or the steel plate, significantly improve the surface quality of heat zinc coating plate, also avoided simultaneously being entrained with a large amount of pure zinc, saved resource, after purification, can remove in the zinc liquid cadmia substantially greater than 20 μ m with cadmia.
Embodiment
In conjunction with content description following examples of the present invention:
Embodiment 1: the employing caliber is that 10mm, length are the round ceramic pipe of 800mm, and zinc liquid velocity of flow is 40mm/s, and feeding current density in vitrified pipe is 10
5A/m
2Direct current, simultaneously by electro-magnet apply magnetic induction density be 1T and with the vertical steady magnetic field of the sense of current, producing electromagnetic force density in zinc liquid is 1 * 10
5N/m
3, can remove cadmia after the purification substantially greater than 20 μ m.
Embodiment 2: the employing cross-sectional dimension is that 10mm * 10mm, length are the square opening vitrified pipe of 500mm, zinc liquid velocity of flow is 50mm/s, apply alternating magnetic field by the coaxial solenoid coil coil, field frequency is 20kHz, the magnetic induction density virtual value is 0.04T, and the maximum electromagnetic force density that produces in zinc liquid is 5 * 10
5N/m
3, can remove cadmia after the purification substantially greater than 15 μ m, the cadmia of 10 μ m is removed efficient can reach 70%.
Embodiment 3: the employing caliber is that 6mm, length are the round ceramic tube bank of 300mm, zinc liquid velocity of flow is 30mm/s, apply travelling-magnetic-field by linear motor, the travel direction of travelling-magnetic-field is vertical with zinc liquid flow direction, magnetic induction density is 0.1T in the air gap, and the electromagnetic force density that produces in zinc liquid is 1.2 * 10
5N/m
3, remove efficient greater than the cadmia of 20 μ m after purifying and to reach 90%.
Claims (4)
1, a kind of method of removing cadmia in the hot galvanizing liquid, it is characterized in that, utilize cadmia and zinc liquid on electroconductibility than big-difference, apply electromagnetic force field by direct or induced mode, set up pressure gradient in the zinc liquid in vitrified pipe, make the cadmia of poorly conductive wherein be subjected to the effect of the electromagnetic pinch force that zinc liquid on every side bestows and directional migration takes place, be trapped in the vitrified pipe wall, thereby reach the purpose of removing cadmia.
2, the method for cadmia in the removal hot galvanizing liquid according to claim 1 is characterized in that, comprises the steps:
(1) make zinc liquid continuously by one or a branch of circle or rectangular ceramic pipe by the mobile of zinc liquid in the zinc pot or employing electromagnetic pump;
(2) in vitrified pipe, feed direct current and apply simultaneously one with the vertical steady magnetic field of the sense of current, make the zinc liquid of vitrified pipe inside be subjected to electromagnetic force effect perpendicular to the vitrified pipe wall;
(3) cadmia in the zinc liquid is subjected to the effect of the electromagnetic pinch force that zinc liquid on every side bestows, and moves in the opposite direction along the electromagnetic force side that is subjected to zinc liquid, is hunted down up to migrating to the vitrified pipe wall;
(4) vitrified pipe of cadmia is caught in periodic replacement, removes cadmia.
3, the method for cadmia in the removal hot galvanizing liquid according to claim 2, it is characterized in that, step (2) feeds direct current and applies one and the vertical steady magnetic field of the sense of current simultaneously in vitrified pipe, or apply alternating magnetic field, or apply travelling-magnetic-field by linear motor by the coaxial solenoid coil coil.
4, the method for cadmia in the removal hot galvanizing liquid according to claim 1 is characterized in that, the direction of electromagnetic pinch force is opposite with the electromagnetic force direction that zinc liquid is subjected to, and size is directly proportional with the electromagnetic force that equal-volume zinc liquid is subjected to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100288823A CN100368587C (en) | 2005-08-18 | 2005-08-18 | Method for removing zinc slag from hot galvanizing liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100288823A CN100368587C (en) | 2005-08-18 | 2005-08-18 | Method for removing zinc slag from hot galvanizing liquid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1730712A true CN1730712A (en) | 2006-02-08 |
| CN100368587C CN100368587C (en) | 2008-02-13 |
Family
ID=35963133
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100288823A Expired - Fee Related CN100368587C (en) | 2005-08-18 | 2005-08-18 | Method for removing zinc slag from hot galvanizing liquid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100368587C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100462454C (en) * | 2007-06-07 | 2009-02-18 | 上海交通大学 | Dual channel electromagnetic method for separating zinc dross from hot galvanizing zinc fluid |
| CN103184344A (en) * | 2013-04-11 | 2013-07-03 | 常州大学 | Device and method of removing zinc dross in continuous hot dip galvanized aluminium |
| CN104040013A (en) * | 2011-10-20 | 2014-09-10 | 安赛乐米塔尔研发有限公司 | Method for dip coating a steel strip and facility for implementing same |
| WO2018223746A1 (en) * | 2017-06-06 | 2018-12-13 | 宝山钢铁股份有限公司 | Method and device for controlling flow of liquid zinc in zinc pot for hot-dip galvanization |
| CN111394673A (en) * | 2020-03-09 | 2020-07-10 | 上海大学 | Electromagnetic drive zinc pot bottom zinc liquid, method and device for fishing zinc pot bottom slag |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6187257B1 (en) * | 1998-07-30 | 2001-02-13 | Inductotherm Corp. | Dross removal on coating lines |
| CN1169979C (en) * | 2001-12-11 | 2004-10-06 | 上海交通大学 | Process for removing non-metal impurities from molten aluminium |
-
2005
- 2005-08-18 CN CNB2005100288823A patent/CN100368587C/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100462454C (en) * | 2007-06-07 | 2009-02-18 | 上海交通大学 | Dual channel electromagnetic method for separating zinc dross from hot galvanizing zinc fluid |
| CN104040013A (en) * | 2011-10-20 | 2014-09-10 | 安赛乐米塔尔研发有限公司 | Method for dip coating a steel strip and facility for implementing same |
| CN104040013B (en) * | 2011-10-20 | 2016-04-13 | 安赛乐米塔尔研发有限公司 | The method of dip-coating steel band and facilities and equipments thereof |
| US9719162B2 (en) | 2011-10-20 | 2017-08-01 | ArcelorMittal Investigación y Desarrollo, S.L. | Method for dip coating a steel strip and facility for implementing same |
| US11072846B2 (en) | 2011-10-20 | 2021-07-27 | Arcelormittal | Method for hot-dip coating a steel strip and facility for implementing same |
| CN103184344A (en) * | 2013-04-11 | 2013-07-03 | 常州大学 | Device and method of removing zinc dross in continuous hot dip galvanized aluminium |
| CN103184344B (en) * | 2013-04-11 | 2014-10-29 | 常州大学 | Device and method of removing zinc dross in continuous hot dip galvanized aluminium |
| WO2018223746A1 (en) * | 2017-06-06 | 2018-12-13 | 宝山钢铁股份有限公司 | Method and device for controlling flow of liquid zinc in zinc pot for hot-dip galvanization |
| CN108998750A (en) * | 2017-06-06 | 2018-12-14 | 宝山钢铁股份有限公司 | The flow control method and device of zinc liquid in hot-dip galvanized pan |
| CN108998750B (en) * | 2017-06-06 | 2020-04-28 | 宝山钢铁股份有限公司 | Flow control method and device for zinc liquid in hot galvanizing zinc pot |
| CN111394673A (en) * | 2020-03-09 | 2020-07-10 | 上海大学 | Electromagnetic drive zinc pot bottom zinc liquid, method and device for fishing zinc pot bottom slag |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100368587C (en) | 2008-02-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100368587C (en) | Method for removing zinc slag from hot galvanizing liquid | |
| CN100503875C (en) | Continuous and electromagnetic separating method for zinc slag in heat galvanizing liquid | |
| CN101104917A (en) | Composite purification device for continuously removing zinc slag in heat zinc coating liquid | |
| CN103282535A (en) | Apparatus for removing pollutant source from snout of galvanizing line | |
| EP3608436B1 (en) | Method and device for controlling flow of liquid zinc in zinc pot for hot-dip galvanization | |
| CN111719103B (en) | Control method for spangles on surface of continuous hot-dip galvanized aluminum-silicon alloy coated steel plate/strip | |
| CN1329536C (en) | Electromagnetic cleaning means for hot galvanizing liquid | |
| CN101092681A (en) | Hot galvanizing pot in type of circulating and purifying zinc | |
| CN100462454C (en) | Dual channel electromagnetic method for separating zinc dross from hot galvanizing zinc fluid | |
| CN108300953B (en) | Zinc liquid purifying device and purifying method thereof | |
| CN100500892C (en) | Double-path electromagnetic separating device for zinc slag in heat galvanizing liquid | |
| CN2923733Y (en) | Ceramic zinc-sludge filtering device | |
| CN201395621Y (en) | Mobile liquid zinc purification device | |
| CN107523774A (en) | A kind of method of inhibiting band steel continuous hot galvanizing machine group zinc boiler bottom ash generation | |
| CN102925839A (en) | Method for centrifugally separating zinc slag from continuous hot dip coating zinc aluminum in medium-high-frequency amplitude-modulation magnetic field | |
| CN103184344B (en) | Device and method of removing zinc dross in continuous hot dip galvanized aluminium | |
| CN106399888A (en) | Operation method for galvanizing zinc purification | |
| CN201144273Y (en) | Constant temperature zinc liquid chute | |
| CN106756815A (en) | A kind of magnetic filter for cathodic arc ion plating | |
| JP2007284775A (en) | Coating weight controller for continuous hot dip metal plating | |
| CN102994930A (en) | Heating device for continuous hot dip aluminium plating zinc pot | |
| CN110295335A (en) | A kind of separator reducing Zinc bath bottom slag cumulant | |
| CN102212769A (en) | Alternating electromagnetic zinc smearing method and device | |
| JPH0293052A (en) | Galvanizing equipment | |
| Sippola et al. | Use of high zinc bath entry strip temperature to solve coating problems |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080213 Termination date: 20200818 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |