CN100462454C - Dual channel electromagnetic method for separating zinc dross from hot galvanizing zinc fluid - Google Patents
Dual channel electromagnetic method for separating zinc dross from hot galvanizing zinc fluid Download PDFInfo
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- CN100462454C CN100462454C CNB2007100417062A CN200710041706A CN100462454C CN 100462454 C CN100462454 C CN 100462454C CN B2007100417062 A CNB2007100417062 A CN B2007100417062A CN 200710041706 A CN200710041706 A CN 200710041706A CN 100462454 C CN100462454 C CN 100462454C
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- zinc
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
This invention discloses a double-channel electromagnetic method for separating zinc residue from hot-plating zinc solution. The method comprises: sucking out zinc solution from a kettle with a pump that can continuously run, introducing into a double-channel electromagnetic purification flow groove outside the kettle, performing primary filtration with a foamed ceramic filter, introducing into an electromagnetic purification apparatus, performing secondary filtration via applying an alternate magnetic field, and returning into the kettle via a pipeline. Both the primary and the secondary filtration processes are performed in the double-channel electromagnetic purification flow groove, in which there are an electromagnetic valve, a primary filter and a secondary filtration electromagnetic purification apparatus inside either channel. During the purification process, more and more zinc residues are attached to the ceramic tube wall, so the ceramic tube should be replaced when accumulated zinc residues reach a certain quantity. The ceramic tube is replaced by: tswitching off the electromagnetic valve at the front end of one channel to cut off the communication of the zinc solution, and meanwhile switching on the electromagnetic valve at the front end of the other channel. The method can continuously purify for 6 h, reduce the content of zinc residues suspending in the zinc solution by more than 90%, and decrease zinc consumption by 12%.
Description
Technical field
What the present invention relates to is a kind of method of Metal smelting technical field, specifically is the method for cadmia in a kind of dual-channel electromagnetic heat of dissociation galvanizing flux.
Background technology
Hot-dip galvanizing sheet steel is widely used in automotive industry owing to having good anti-corrosion, weldability, coating and press formability.Great surface quality is that hot-dip galvanizing sheet steel is as the automobile prerequisite quality of inner and outer plates.Although the surface quality of hot dip galvanizing automobile plate has obtained large increase recent years, the hot-dip galvanized sheet used by automobile of producing free of surface defects remains a stern challenge.
In the defective that influences hot dip galvanizing automobile plate surface quality, the cadmia defective is to reduce the greatest factor of vehicle plate surface quality.Cadmia is that the react to each other Fe-Al-Zn that generates of Al, Fe and the Zn in the zinc liquid is that compound is mutually between ternary metal.According to physical properties (mainly according to the density) difference of cadmia, cadmia can be divided three classes: face slag, suspension slag and end slag.In pot galvanize was produced, even if can accomplish the accurate control of hot galvanizing liquid composition, cadmia also can the inevitable formation owing to the inhomogeneous of zinc bath temperature in the interpolation of Al in the zinc liquid, the dissolving of being with Fe in the steel and the zinc pot.Cadmia in the zinc liquid is in case produce, the face slag can be skimmed by the workman is constantly manual, end slag can be pulled out when stopping production, removal for scum silica frost is then powerless, there is certain limitation in this cadmia removal method, be entrained with expensive pure zinc more than 90% in the cadmia of for example pulling out, manually drag for the inefficiency of slag etc.For this reason, must find a kind of separation method of cadmia more efficiently to remove cadmia in the hot galvanizing liquid, to satisfy the dual needs of economy and technological layer.In recent years, utilize electromagnetic separation technology to remove the application of having succeeded of nonmetal inclusion in the liquid metal.Electromagnetic separation technology possesses advantages such as pollution-free and efficient, utilizes this technology can separate the very little nonmetal inclusion of granularity in the liquid metal.
Find through literature search prior art, application number is that 200510028882.3 Chinese invention patent relates to a kind of method of removing cadmia in the hot galvanizing liquid, this method be 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 grants and directional migration takes place, be trapped in the vitrified pipe wall, thereby reach the purpose of removing cadmia.But the shortcoming of the described method of this patent is to accomplish that most zinc liquid participate in purifying in the zinc pot, and the cadmia of the ceramic vessel wall in being immersed in zinc liquid absorption is when running up to some amount, must change vitrified pipe, the electromagnetic purification of this moment can only interrupt, can not accomplish the continuous separation of cadmia in the hot galvanizing liquid, all there is certain deficiency in the purification efficiency and the effect of zinc pot integral body.
Summary of the invention
The objective of the invention is to overcome deficiency of the prior art, the method of cadmia in a kind of dual-channel electromagnetic heat of dissociation galvanizing flux is provided, hot galvanizing liquid is being purified when the external dual-channel electromagnetic of zinc pot purifies chute by being installed in, cadmia in the zinc liquid obtains separating, avoid it in the zinc pot, to continue to grow up or deposit being adhered on zinc-plated roller or the plating piece, to reduce the cadmia defective on hot-galvanized steel device surface, effectively improve its surface quality.And use the dual-channel electromagnetic purifying method can guarantee the continuous purification of hot galvanizing liquid, increase the melt treatment amount in the unit time, improve purification efficiency, electromagnetic purification is ended because of the vitrified pipe of changing in the electromagnetic cleaning means.
The present invention is achieved through the following technical solutions, the present invention includes following steps:
(1) adopts continuous type zinc liquid pump that zinc liquid is extracted out from the zinc pot, zinc liquid is flowed into be placed into the external dual-channel electromagnetic purification chute of zinc pot; This dual-channel electromagnetic purifies each passage front end of chute magnetic valve all is installed, and grade one filter and cascade filtration electromagnetic cleaning means all are installed in each passage;
(2) sepn process of cadmia from zinc liquid all purifies in the chute at described dual-channel electromagnetic and carries out.Sepn process comprises two parts: one-level is filtered and cascade filtration.In one-level is filtered, use ceramic foam filter to remove the cadmia of granularity greater than 30 μ m.
(3) flow into electromagnetic cleaning means through the hot galvanizing liquid after the one-level filtration and carry out cascade filtration, apply alternating magnetic field by the coaxial solenoid coil coil, make the zinc liquid of vitrified pipe inside be subjected to electromagnetic force effect perpendicular to the vitrified pipe wall, cadmia in the zinc liquid moves in the opposite direction along the electromagnetic force side that is subjected to zinc liquid under the effect of electromagnetic field, is hunted down up to migrating to the vitrified pipe wall.
(4) after zinc liquid flows out, flow back to the zinc pot from dual-channel electromagnetic purification chute, finish the external continuous purification process of zinc pot of hot galvanizing liquid by the pipeline that links to each other with the zinc pot.
(5) after purification after a while, cadmia can be more and more attached on the vitrified pipe inwall, when cadmia runs up to some amount, close the magnetic valve that is installed on this passage front end, cut off the circulation of zinc liquid, open the magnetic valve of another passage simultaneously, make the flow through dual stage filter apparatus of this passage of zinc liquid, guarantee the continuity that zinc liquid purifies.
Described ceramic foam filter specification is 5～60ppi, removes the cadmia of granularity greater than 30 μ m.
Described vitrified pipe is that external diameter is that 70-200mm, length are cellular square opening or the circular port vitrified pipe of 200-400mm.
Describedly apply alternating magnetic field by the coaxial solenoid coil coil, wherein field frequency is 20-30kHz, and magnetic induction density virtual value B is 0.03-0.10T.
Described zinc liquid flows out from electromagnetic cleaning means, and its zinc liquid velocity of flow is 30-50mm/s, can remove the cadmia greater than 5-30 μ m after the purification substantially.
The method of cadmia is a zinc pot purging in vitro in the dual-channel electromagnetic heat of dissociation galvanizing flux of the present invention, and the zinc liquid that extracts under the effect of zinc liquid pump in the zinc pot purifies in the chute one-level of flowing through ceramic foam filter and electromagnetic cleaning means to dual-channel electromagnetic.When flowing through the one-level ceramic foam filter, granularity is removed greater than the cadmia of 30 μ m; After the grade one filter outflow, zinc liquid constantly flows through from the porous ceramic pipe of electromagnetic cleaning means, in this process, apply electromagnetic field by ruhmkorff coil, since cadmia and zinc liquid on electroconductibility than big-difference, the following cadmia of granularity 30 μ m takes place to move under the effect of electromagnetic pinch force and also constantly is deposited on the vitrified pipe wall.When the vitrified pipe inwall in one of them passage needs to change owing to the more cadmia of absorption, can be installed on the magnetic valve realization zinc liquid circulation of passage front end by control, like this, hot galvanizing liquid in the zinc pot is purified continuously, wherein most of cadmia was removed in the very first time that forms, and reduced the possibility that produces the cadmia defective greatly.
The method of cadmia is carried out purifying treatment in zinc pot outside in the dual-channel electromagnetic heat of dissociation galvanizing flux of the present invention, to apply frequency in coil be 30kHz, when magnetic induction density is the alternating magnetic field of 0.10T, the employing diameter is that 70mm, length are that 400mm, circular port diameter are that 10mm is the cellular circular port vitrified pipe of 10mm * 10mm, at the zinc flow quantity is under the situation of 10t/h, continuous purification 6h, the zinc slag content that suspends in the zinc liquid in the zinc pot is reduced more than 85%, and make zinc consumption reduce by 10%.When adopting diameter is that 70mm, length are the cellular square opening vitrified pipe that 400mm, square opening are of a size of 10 * 10mm, at the zinc flow quantity is under the situation of 10t/h, continuous purification 6h can make the zinc slag content that suspends in the zinc liquid in the zinc pot reduce more than 90%, and make zinc consumption reduce by 12%.
Description of drawings
Fig. 1 applies the synoptic diagram that alternating magnetic field is removed cadmia.
Fig. 2 is the embodiment synoptic diagram of cadmia in the dual-channel electromagnetic heat of dissociation galvanizing flux.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated: present embodiment has provided detailed embodiment and process being to implement under the prerequisite with the technical solution of the present invention, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, the present invention utilize cadmia and zinc liquid on electroconductibility than big-difference, by applying alternating magnetic field, 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.Zinc liquid is flowed through and is placed ruhmkorff coil interior square opening or circular port porous ceramic pipe, and cadmia moves in ceramic vessel wall, and zinc liquid is purified.
As shown in Figure 2, hot galvanizing liquid is extracted out from the zinc pot by the zinc liquid pump, flows through to place the outer dual-channel electromagnetic of zinc pot to purify chute, and by ceramic foam filter and electromagnetic cleaning means, zinc liquid obtains continuous purification.
Embodiment 1
Present embodiment adopts continuous type zinc liquid pump that zinc liquid is extracted out from the zinc pot, makes zinc liquid be placed into the external dual-channel electromagnetic purification chute of zinc pot through zinc liquid ingress pipe and magnetic valve inflow.The sepn process of cadmia from zinc liquid all purifies in the chute at dual-channel electromagnetic to be carried out.Sepn process comprises two parts: one-level is filtered and cascade filtration.In one-level is filtered, use ceramic foam filter to remove the cadmia of granularity greater than 30 μ m.Produce alternating magnetic field by the high frequency magnetic field generating unit, field frequency is 20kHz, and magnetic induction density virtual value B is 0.03T, and employing length is that 200mm, diameter are the circular port vitrified pipe of 10mm, zinc liquid velocity of flow is 50mm/s, can remove the cadmia greater than 18 μ m after the purification substantially.Employing length is that 200mm, cross-sectional dimension are the square opening vitrified pipe of 10mm * 10mm, and zinc liquid velocity of flow is 40mm/s, can remove the cadmia greater than 15 μ m after the purification substantially.Zinc liquid flows back to the zinc pot by the zinc liquid delivery line that links to each other with the zinc pot after flowing out from dual-channel electromagnetic purification chute, finish the external continuous purification process of zinc pot of hot galvanizing liquid.After purification after a while, cadmia can be more and more attached on the vitrified pipe inwall, when cadmia runs up to some amount and need change vitrified pipe, close the magnetic valve that is installed on this passage front end, open the magnetic valve of another passage front end simultaneously, make zinc liquid another chute of flowing through, zinc liquid is uninterruptedly purified.Press processing parameter and vitrified pipe specification in the present embodiment, when using the circular port vitrified pipe, through the 10h purifying treatment, total removal efficient of cadmia can reach 60% in the zinc liquid, and zinc consumption can reduce by 6%; When using the square opening vitrified pipe, through the 8h purifying treatment, total removal efficient of cadmia can reach 65% in the zinc liquid, and zinc consumption can reduce by 6.5%.
Embodiment 2
Present embodiment adopts continuous type zinc liquid pump that zinc liquid is extracted out from the zinc pot, makes zinc liquid be placed into the external dual-channel electromagnetic purification chute of zinc pot through zinc liquid ingress pipe and magnetic valve inflow.The sepn process of cadmia from zinc liquid all purifies in the chute at dual-channel electromagnetic to be carried out.Sepn process comprises two parts: one-level is filtered and cascade filtration.In one-level is filtered, use ceramic foam filter to remove the cadmia of granularity greater than 30 μ m.Produce alternating magnetic field by the high frequency magnetic field generating unit, field frequency is 20kHz, and magnetic induction density virtual value B is 0.06T, and employing length is that 300mm, diameter are the circular port vitrified pipe of 10mm, zinc liquid velocity of flow is 40mm/s, can remove the cadmia greater than 12 μ m after the purification substantially.Employing length is that 300mm, cross-sectional dimension are the square opening vitrified pipe of 10mm * 10mm, and zinc liquid velocity of flow is 40mm/s, can remove the cadmia greater than 10 μ m after the purification substantially.Zinc liquid flows back to the zinc pot by the zinc liquid delivery line that links to each other with the zinc pot after flowing out from dual-channel electromagnetic purification chute, finish the external continuous purification process of zinc pot of hot galvanizing liquid.After purification after a while, cadmia can be more and more attached on the vitrified pipe inwall, when cadmia runs up to some amount and need change vitrified pipe, close the magnetic valve that is installed on this passage front end, open the magnetic valve of another passage front end simultaneously, make zinc liquid another chute of flowing through, zinc liquid is uninterruptedly purified.Press processing parameter and vitrified pipe specification in the present embodiment, when using the circular port vitrified pipe, through the 8h purifying treatment, total removal efficient of cadmia can reach 70% in the zinc liquid, and zinc consumption can reduce by 7%; When using the square opening vitrified pipe, through the 8h purifying treatment, total removal efficient of cadmia can reach 75% in the zinc liquid, and zinc consumption can reduce by 7.5%.
Embodiment 3
Present embodiment adopts continuous type zinc liquid pump that zinc liquid is extracted out from the zinc pot, makes zinc liquid be placed into the external dual-channel electromagnetic purification chute of zinc pot through zinc liquid ingress pipe and magnetic valve inflow.The sepn process of cadmia from zinc liquid all purifies in the chute at dual-channel electromagnetic to be carried out.Sepn process comprises two parts: one-level is filtered and cascade filtration.In one-level is filtered, use ceramic foam filter to remove the cadmia of granularity greater than 30 μ m.Produce alternating magnetic field by the high frequency magnetic field generating unit, field frequency is 25kHz, and magnetic induction density virtual value B is 0.10T, and employing length is that 300mm, diameter are the circular port vitrified pipe of 10mm, zinc liquid velocity of flow is 35mm/s, can remove the cadmia greater than 10 μ m after the purification substantially.Employing length is that 300mm, cross-sectional dimension are the square opening vitrified pipe of 10mm * 10mm, and zinc liquid velocity of flow is 35mm/s, can remove the cadmia greater than 8 μ m after the purification substantially.Zinc liquid flows back to the zinc pot by the zinc liquid delivery line that links to each other with the zinc pot after flowing out from dual-channel electromagnetic purification chute, finish the external continuous purification process of zinc pot of hot galvanizing liquid.After purification after a while, cadmia can be more and more attached on the vitrified pipe inwall, when cadmia runs up to some amount and need change vitrified pipe, close the magnetic valve that is installed on this passage front end, open the magnetic valve of another passage front end simultaneously, make zinc liquid another chute of flowing through, zinc liquid is uninterruptedly purified.Press processing parameter and vitrified pipe specification in the present embodiment, when using the circular port vitrified pipe, through the 6h purifying treatment, total removal efficient of cadmia can reach 80% in the zinc liquid, and zinc consumption can reduce by 9%; When using the square opening vitrified pipe, through the 6h purifying treatment, total removal efficient of cadmia can reach 85% in the zinc liquid, and zinc consumption can reduce by 10%.
Embodiment 4
Present embodiment adopts continuous type zinc liquid pump that zinc liquid is extracted out from the zinc pot, makes zinc liquid be placed into the external dual-channel electromagnetic purification chute of zinc pot through zinc liquid ingress pipe and magnetic valve inflow.The sepn process of cadmia from zinc liquid all purifies in the chute at dual-channel electromagnetic to be carried out.Sepn process comprises two parts: one-level is filtered and cascade filtration.In one-level is filtered, use ceramic foam filter to remove the cadmia of granularity greater than 30 μ m.Apply alternating magnetic field by the coaxial solenoid coil coil, field frequency is 30kHz, and magnetic induction density virtual value B is 0.10T, and employing length is that 400mm, diameter are the circular port vitrified pipe of 10mm, zinc liquid velocity of flow is 30mm/s, can remove the cadmia greater than 6 μ m after the purification substantially.Employing length is that 400mm, cross-sectional dimension are the square opening vitrified pipe of 10mm * 10mm, and zinc liquid velocity of flow is 30mm/s, can remove the cadmia greater than 5 μ m after the purification substantially.Zinc liquid flows back to the zinc pot by the zinc liquid delivery line that links to each other with the zinc pot after flowing out from dual-channel electromagnetic purification chute, finish the external continuous purification process of zinc pot of hot galvanizing liquid.After purification after a while, cadmia can be more and more attached on the vitrified pipe inwall, when cadmia runs up to some amount when cadmia runs up to some amount need change vitrified pipe the time, close the magnetic valve that is installed on this passage front end, open the magnetic valve of another passage front end simultaneously, make zinc liquid another chute of flowing through, zinc liquid is uninterruptedly purified.Press processing parameter and vitrified pipe specification in the present embodiment, when using the circular port vitrified pipe, through the 6h purifying treatment, total removal efficient of cadmia can reach 85% in the zinc liquid, and zinc consumption can reduce by 10%; When using the square opening vitrified pipe, through the 6h purifying treatment, total removal efficient of cadmia can reach 90% in the zinc liquid, and zinc consumption can reduce by 12%.
Claims (4)
1. the method for cadmia in the dual-channel electromagnetic heat of dissociation galvanizing flux is characterized in that, may further comprise the steps:
(1) adopts continuous type zinc liquid pump that zinc liquid is extracted out from the zinc pot, zinc liquid is flowed into be placed into the external dual-channel electromagnetic purification chute of zinc pot; This dual-channel electromagnetic purifies each passage front end of chute magnetic valve all is installed, and grade one filter and cascade filtration electromagnetic cleaning means all are installed in each passage;
(2) sepn process of cadmia from zinc liquid all purifies in the chute at described dual-channel electromagnetic and carries out, and sepn process comprises one-level filtration and cascade filtration, and one-level is filtered and used ceramic foam filter to carry out;
(3) flow into electromagnetic cleaning means through the hot galvanizing liquid after the one-level filtration and carry out cascade filtration, apply alternating magnetic field by field generator for magnetic, make the zinc liquid of vitrified pipe inside be subjected to electromagnetic force effect perpendicular to the vitrified pipe wall, cadmia in the zinc liquid moves in the opposite direction along the electromagnetic force side that is subjected to zinc liquid under the effect of electromagnetic field, is hunted down up to migrating to the vitrified pipe wall;
(4) after zinc liquid flows out, flow back to the zinc pot from dual-channel electromagnetic purification chute, finish the external continuous purification process of zinc pot of hot galvanizing liquid by the pipeline that links to each other with the zinc pot;
(5) after purification after a while, cadmia can be more and more attached on the vitrified pipe inwall, when cadmia runs up to some amount and need change vitrified pipe, close the magnetic valve that is installed on this passage front end, cut off the circulation of zinc liquid, open the magnetic valve of another chute front end simultaneously, make zinc liquid another chute of flowing through, zinc liquid is uninterruptedly purified.
2. the method for cadmia is characterized in that in the dual-channel electromagnetic heat of dissociation galvanizing flux according to claim 1, and described ceramic foam filter specification is 5～60ppi, removes the cadmia of granularity greater than 30 μ m.
3. the method for cadmia is characterized in that in the dual-channel electromagnetic heat of dissociation galvanizing flux according to claim 1, describedly applies alternating magnetic field by field generator for magnetic, and wherein field frequency is 20-30kHz, and magnetic induction density virtual value B is 0.03-0.10T.
4. the method for cadmia is characterized in that in the dual-channel electromagnetic heat of dissociation galvanizing flux according to claim 1, and described zinc liquid flows out from electromagnetic cleaning means, and its zinc liquid velocity of flow is 30-50mm/s.
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| CNB2007100417062A CN100462454C (en) | 2007-06-07 | 2007-06-07 | Dual channel electromagnetic method for separating zinc dross from hot galvanizing zinc fluid |
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| CNB2007100417062A CN100462454C (en) | 2007-06-07 | 2007-06-07 | Dual channel electromagnetic method for separating zinc dross from hot galvanizing zinc fluid |
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| CN102168238B (en) * | 2011-02-25 | 2012-11-07 | 常州大学 | A circulating cooling deslagging method in continuous hot dip of zinc-aluminium alloys |
| JP6566048B2 (en) * | 2015-12-24 | 2019-08-28 | 日本製鉄株式会社 | Scum removing device and scum removing method |
| CN110295335B (en) * | 2018-03-22 | 2021-02-19 | 宝山钢铁股份有限公司 | Separation device for reducing accumulation of bottom slag of zinc pot |
| CN111118426B (en) * | 2018-10-31 | 2021-10-22 | 宝山钢铁股份有限公司 | Slag discharging structure and method for zinc pot |
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