CN105040031A - Non-power-outage repairing method for aluminum electrolysis cell short circuit busbar - Google Patents
Non-power-outage repairing method for aluminum electrolysis cell short circuit busbar Download PDFInfo
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Abstract
The invention belongs to the aluminum electrolysis industry and relates to a non-power-outage repairing method for an aluminum electrolysis cell short circuit busbar in a high-intensity magnetic field. The method includes the following steps that firstly, a short circuit busbar damaged area is cut off; secondly, a prefabricated aluminum block is manufactured, and a surface is machined and ground; thirdly, assembling is conducted before welding; fourthly, heat-released welding is conducted; and fifthly, processing is conduced after welding. The non-power-outage repairing method is not disturbed by a high-intensity magnetic field of an electrolysis plant; non-power-outage repairing of open seams, pits and other defects on the short circuit busbar can be achieved; the repaired surface is extremely high in smoothness; the problem that the electric conduction area is reduced due to the uneven surface is effectively solved; the repairing technology is safe and reliable; operation is simple and fast; and the method is suitable for being applied and popularized in the aluminum electrolysis industry.
Description
Technical field
The invention belongs to aluminum electrolysis industry, relate to the restorative procedure that do not have a power failure of the aluminium electrolytic bath short circuit bus under a kind of strong magnetic field circumstance.
Background technology
In recent years, national aluminium industry development is swift and violent, is the output improving aluminium, aluminum cell current intensity also from before 100KA develop into present 300KA, 400KA, 500KA and 600KA, current 700KA electrolyzer is also among research and development.Electrolytic bath amount is large, and conductor configuration is comparatively complicated, and whole potroom produces powerful electromagnetic field.Different according to strength of current, electrolyzer magneticstrength design maximum is 20 ~ 50GS, but the field strength values in actual moving process reaches 850GS, even if under the state had a power failure, powerful remanent magnetism still difficulty is eliminated in short-term.
Aluminium cell in process of production; riser bus bar and short-circuit busbar often can be subject to unexpected injury and occur damage; especially short-circuit opening arc-over, insulcrete puncture the riser bus bar that causes and short-circuit busbar and blow out seam broken etc.; so that conductive area reduces; the current density of unit surface increases; cause the temperature of riser bus bar too high, energy consumption increases, and there are potential major safety risks.For these damages that short-circuit busbar occurs, generally need to adopt arc welding method to repair.But the enforcement of the existence in magnetic field to welding creates very large negative impact, cause whole welding process difficulty, appearance of weld of poor quality, even likely make welding process implement.In selection welding process, the welding process that diamagnetic ability is strong or not affected by magnetic fields can be taked in theory.From current status quo, conventional welding process is difficult to the interference problem solving high-intensity magnetic field near electrolyzer.If take power down, electrolyzer being produced and will bring immeasurable loss, welding technique not affected by magnetic fields can be taked when not having a power failure to become a technical barrier in the urgent need to address.
In order to avoid the destroying infection brought electrolyzer that has a power failure, domestic and international electrolytic aluminum producer attempts the processing method taking various band electric welding.If denomination of invention is " a kind of magnetic disturbance resistant electric arc welding apparatus ", application number technology disclosed in the patent of 200820077927.5 will have carried out successful welding test the end of the year 2008 on the anode balance bus of 190KA electrolyzer.Research and develop in test the continuation of 2009, have employed three-dimensional combination shielding, electromagnetic shielding is protected, regulation experiment has been carried out in safety operation protection, carried out in October, 2009 welding test that do not have a power failure and succeeded.Denomination of invention is " electrifying welding method of aluminium bus of electrolyzer ", the patent No. be 200810153133 the aluminium bus of electrolyzer that patent discloses not have a power failure welding process, place a stainless steel shield ring in the front of explosive welding block, then carry out conventional junction steel plate built-up welding welding.These method ranges of application and limited, be suitable only for the less and simple occasion in magnetic field of electric current, and due to the complicacy of aluminium cell ambient conditions, all three-dimensional stereoscopic rotating magnetic field in the magnetic field of cell side busbar any point in actual moving process, and be change over time, magneticstrength is very large, there is distribution in magnetic field along all directions, be difficult to adopt conventional " covering, anti-, lead, dredge, disturb " etc. Technology eliminate influence of magnetic field, especially perpendicular to the more difficult shielding of magnetic-field component of bead direction, and demagnetization cost is very high, so cannot apply on a large scale in actual production.
In order to realize the good welds of magnetic field internal short-circuit bus, the welding process that diamagnetic ability is strong or not affected by magnetic fields can be adopted in theory.From current status quo, conventional method is difficult to the interference problem solving magnetic field.Resistance welding needs unit clamp, and is subject to the restriction in short-circuit busbar position and space, and distribution of current is uneven simultaneously, and appearance of weld and welding quality are difficult to be guaranteed.Gas welding and pressure gas welding due to its welding efficiency is lower and pressure gas welding time pressing technology restriction, be not suitable for the site welding operation of aluminium cell.It is very ripe that agitating friction is welded in technology when being applied to thin plate aluminum alloy welding, but still can not be used for the welding that aluminium bar bus is amassed in large section.Casting welding is a kind of welding technique that foundry engieering and soldering tech combine.Domestic many aluminium smelter enterprises are attempted in this respect.If denomination of invention is " a kind of fusion casting and welding method of aluminum mother plate ", application number is the fusion casting and welding method that patent discloses a kind of aluminum mother plate of 200510003327.5, aluminum mother plate welding surface is removed contamination, oil removing, remove oxide film process, at mother metal surface smear soldering flux to be welded, according to shape and the requirement of joint, founding chamber is made in welding joint position with fire resistant flame retardant material, preheating is carried out to aluminum mother plate, after aluminum mother plate temperature reaches 100-200 DEG C, with the aluminum and its alloy that melting equipment heat fused prepares by a certain percentage, the aluminum alloy melt of melting is cast in molten chamber, utilize the high temperature melting base metals of molten metal, fill weld seam simultaneously, realize welding.This method has the following disadvantages: (1), due to the restriction of heating condition, the temperature of aluminium liquid only has degree more than 900, only a little more than the fusing point of aluminium, topples over mother metal after entering weld seam and dispels the heat rapidly, is difficult to realize fusing preferably; (2) joint filling of aluminium liquid only relies on gravity, and joint filling effect is bad; (3) aluminium liquid and mother metal wetting effect poor.
In view of the inferior position of above-mentioned various method, Some Enterprises is attempted adopting exothermic welding method column bus and short-circuit busbar to repair, and makes certain gains.As patent " the charged restorative procedure of aluminum electrolytic cell riser bus bar " (application number: 201310175028.4), disclose the charged restorative procedure of a kind of aluminum electrolytic cell riser bus bar, comprise and carry out damaging process, graphite rod being installed and calculating the series of processes such as the addition of the charged reparation flux of aluminum electrolytic cell riser bus bar, installation mold, welding, die sinking and the process of weld metal face to breach surface.The charged restorative procedure of the aluminum electrolytic cell riser bus bar adopting this invention to provide, can realize the charged reparation of riser bus bar and short-circuit busbar, can not by the interference of cell room high-intensity magnetic field.But there is following problem in this invention: (1) belongs to the side opening shape of the mouth as one speaks due to weldprocedure, when molten metal enters from the side and fills up breach gradually, easily occur incomplete fusion after upper strata molten metal solidifies and between lower floor's bus, and welding slag not easily processes, easy generation slag inclusion, affects welding quality; (2) carry out short circuit (being called short-circuit opening) because riser bus bar and short-circuit busbar need when stopping groove to be crimped together, surface finish requires high, so postwelding needs conscientiously to polish to face of weld to make its smooth surface.Weldering meat metal is oxidized by there will be metallic high temperature in alloy composition and welding process on the one hand, so weldering meat hardness is very high, polishing speed is very slow; On the other hand, due to the existence of high-intensity magnetic field and the restriction of short-circuit opening site space, the comparatively skinny device such as angle grinding machine can only be used, considerably increase polishing difficulty.In general, a short-circuit busbar welding only needs dozens of minutes, but the polishing of weldering meat surface often needs even time a couple of days a few hours; And the weldering meat surface after polishing cannot reach surface flatness and the flatness requirement of original bus, still there is certain potential safety hazard.
Based on above-mentioned each patent defect, contriver is for providing a kind of restorative procedure that do not have a power failure of the aluminium electrolytic bath short circuit bus based on exothermic weld.
Summary of the invention
Technical problem to be solved by this invention is the restorative procedure that do not have a power failure providing a kind of aluminium electrolytic bath short circuit bus based on exothermic weld.
For reaching above object, the technical solution adopted in the present invention is:
The restorative procedure that do not have a power failure of aluminium electrolytic bath short circuit bus, specifically comprises the following steps:
1) damage zone is excised: tilted 3 ~ 5 ° from top by short-circuit busbar and excise l-shaped downwards, guarantee that on bus, damage field removes completely;
2) prefabricated aluminium block is made: according to the prefabricated aluminium block of area size cut on short-circuit busbar, prefabricated aluminium block treats that fusion face retains the inclination angle of 3 ~ 5 °, and be configured with the connecting hole with position, size match on short-circuit busbar, then polishing process is carried out to prefabricated aluminium block electrolysis (treating the fusion face back side);
3) assembling before weldering: what prefabricated aluminium block is placed in short-circuit busbar is removed district, guarantees that prefabricated aluminium block electrolysis is concordant with short-circuit busbar facade, inserts close-fitting graphite rod in the connecting hole of short-circuit busbar and prefabricated aluminium block; Between prefabricated aluminium block and short-circuit busbar, form V-type groove, V-type groove two ends graphite cake is sealed, and uses chamotte sealing-gap;
Be placed in by charging mould on V-type groove, below aperture catch seals; According to gap length to be welded, take appropriate aluminium base self-propagating welding powder, load in charging mould, and sprinkle pyrophoric powders on its surface, insert lead-in wire;
4) exothermic weld: carry out weld preheating to short-circuit busbar, prefabricated aluminium block, graphite cake, then put combustion wire, causes thermopositive reaction, and after the catch fusing of charging mold bottom, high-temperature liquid metal flow into V-type groove by mould small hole at bottom part of feeding;
5) after welding treatment: after molten metal cooling, the lower graphite cake of dismounting and graphite rod, cleaning welding slag, then polish flat high for weldering.
There is the inclination angle of 3 ~ 5 ° in the short-circuit busbar tangent plane of step (1) and the prefabricated aluminium block seam face for the treatment of of step (2), mainly in order to high-temperature liquid metal from charging mould below aperture ejection after, easilier on tangent plane, go out pit, form rough coarse tangent plane, high temperature aluminum liquid can be increased and fuse area with short-circuit busbar and welding of prefabricated aluminium block, make welding more solid and reliable.
Undertaken processing and polishing process by the milling machine of prefabricated aluminium block electrolysis in advance outside potroom and grinding machine in step (2), the high rigidity, high-intensity magnetic field, the narrow space that exist when avoiding on-the-spot directly polishing weldering meat, the comparatively restriction such as skinny device polishing such as angle grinding machine can only be used, greatly reduce operation easier and working strength, improve remediation efficiency, just the same even slightly higher before repairing the surface finish of rear short-circuit busbar electrolysis, slickness and reparation, meet service requirements, avoid potential safety hazard.
Charging mold material in step (3) is graphite.
Preliminary heating device in step (3) is the oxyacetylene welding equipment without the need to electricity consumption.Preheating flame is avoided directly to impact the surface to be welded of short-circuit busbar and prefabricated aluminium block.
Step is preheating to 200 ~ 300 DEG C in (3).
The V-type trench bottom formed between prefabricated aluminium block and short-circuit busbar in step (3) has 10 ~ 20mm width.Mainly in order to there be enough molten metals can arrive V-type trench bottom, thus gap bottom prefabricated aluminium block and between short-circuit busbar can be fused by wicking action.But gap, V-type bottom land limit again can not be excessive, if this excessive clearance, prefabricated aluminium block thickness certainly will be reduced, then easily cause the prefabricated aluminium block of too much high-temperature liquid metal burn through.
In the connecting hole of short-circuit busbar and prefabricated aluminium block, insert close-fitting graphite rod in step (3), graphite rod is across V-type groove.Object is the connecting hole in order to reserve after welding on short-circuit busbar, does not need to carry out secondary processing.
Aluminium base self-propagating welding powder component described in step (3) can be by mass percentage: cupric oxide 17 ~ 19%, Vanadium Pentoxide in FLAKES 12 ~ 14%, tindioxide 13 ~ 15%, vitriol 1 ~ 2%, boron powder 3 ~ 4%, and Calcium Fluoride (Fluorspan) 2.5 ~ 3%, all the other are aluminium powder.
Aluminium electrolytic bath short circuit bus provided by the invention is adopted not have a power failure restorative procedure, not by the interference of cell room high-intensity magnetic field, the reparation that do not have a power failure of the defects such as the seam broken on short-circuit busbar, pit can be realized, and the surface smoothness after repairing is high, effectively evade the problem that the conductive area that causes due to surface irregularity reduces.Process safety is reliable, rapidly simple to operate, is adapted at electrolysis of aluminum industry and applies.
A kind of aluminium electrolytic bath short circuit bus of the present invention restorative procedure that do not have a power failure compares previous method, has following outstanding beneficial effect:
200820077927.5), patent " the electrifying welding method of aluminium bus of electrolyzer " (patent No.: compared with 200810153133) etc. (1) with patent " a kind of magnetic disturbance resistant electric arc welding apparatus " (application number:, the present invention need not use Deperming Facility to carry out demagnetization process, has evaded high demagnetization cost.And the present invention by the impact of the complexity in magnetic field and intensity etc., has not effectively widened range of application.
(2) with patent " a kind of fusion casting and welding method of aluminum mother plate " (application number: 200510003327.5), the present invention utilizes the heat production of thermite reaction to melt short-circuit busbar and prefabricated aluminium block inwall, and molten metal is gone out by small hole injection below mould under the pressure of thermite reaction.Under the high calorie and strong pressure effect of thermite reaction, fusion and joint filling effect preferably can be realized, avoid casting demixing phenomenon.
(3) with patent " the charged restorative procedure of aluminum electrolytic cell riser bus bar " (application number: 201310175028.4), the present invention need not carry out extra Artificial lesions's process to welding surface, utilize the jetting action of molten metal can go out pit at surface to be welded, realize solid and reliable welding; Molten metal of the present invention injects molten bath from top to bottom, and molten metal cools from top to bottom gradually, and welding slag floats, and has evaded the shortcoming that incomplete fusion, scarfing cinder difficulty, poor welding quality easily appear in original method; The present invention adds in workshop at the machine without magnetic field in advance prefabricated aluminium block electrolysis and milling machine and grinding machine is processed and polishes process, the high rigidity, high-intensity magnetic field, the narrow space that exist when avoiding on-the-spot directly polishing weldering meat, the comparatively restriction such as skinny device polishing such as angle grinding machine can only be used, greatly reduce operation easier and working strength, improve remediation efficiency, just the same even slightly higher before repairing the surface finish of rear short-circuit busbar electrolysis, slickness and reparation, meet service requirements, avoid potential safety hazard.
Accompanying drawing explanation
Fig. 1 is short-circuit busbar seam broken schematic three dimensional views.
Fig. 2 is short-circuit busbar seam broken side diagram.
Fig. 3 is schematic diagram behind short-circuit busbar excision damage zone.
Fig. 4 is short-circuit busbar and prefabricated aluminium block wiring layout.
Fig. 5 is welding plant schematic diagram.
Fig. 6 is schematic diagram after short-circuit busbar reparation.
Wherein, 1-short-circuit busbar; 2-connecting hole; 3-seam broken; 4-prefabricated aluminium block; 5-graphite rod; 6-graphite cake; 7-charging mould; 8-aluminium base self-propagating welding powder; 9-catch; 10-weld seam.
Embodiment
Embodiment one:
(1) damage zone is excised: from the downward-sloping excision in short-circuit busbar top, 3 °, angle of inclination, guarantees that on bus, damage field removes completely.
(2) prefabricated aluminium block is made, processing and polishing process is carried out on electrolysis surface: measure cut area size (length 220mm on short-circuit busbar, height 180mm, bottom side length 30mm) and connecting hole size (diameter 48mm), prefabricated aluminium block (length 220mm is made according to measurement size, height 180mm, bottom side length 20mm), prefabricated aluminium block treats that fusion face retains the inclination angle of 3 °, prefabricated aluminium block gets out the circular hole with connecting hole position, size match on short-circuit busbar, and on grinding machine, polishing process is carried out to the electrolysis (treating the fusion face back side) of prefabricated aluminium block.
(3) assembling before weldering: what prefabricated aluminium block is placed in short-circuit busbar is removed district, guarantee that prefabricated aluminium block polished face is concordant with short-circuit busbar facade, form V-type groove between prefabricated aluminium block and short-circuit busbar, and gap, V-type bottom land limit is 10mm.In the connecting hole of short-circuit busbar and prefabricated aluminium block, insert close-fitting graphite rod, V-type groove two ends graphite cake, across V-type groove, seals, and uses chamotte sealing-gap, to prevent molten metal excessive by graphite rod.Weld preheating is carried out to short-circuit busbar, prefabricated aluminium block, graphite cake, is preheating to 300 DEG C.Aperture kaolin below charging mould is sealed, and is placed on position to be welded.According to gap length to be welded, according to 43(Al powder): 19(CuO): 14(V2O5): 15(SnO2): 2(CaSO4): 4(B powder): mass percent 3(CaF2) prepares 3 kilograms of aluminium base self-propagating welding powders, load in charging mould, and sprinkle pyrophoric powders on its surface, insert lead-in wire.
(4) exothermic weld: some combustion wire, causes thermopositive reaction.After the catch fusing of charging mold bottom, high-temperature liquid metal flow into position to be welded by mould small hole at bottom part of feeding.
(5) after welding treatment: after molten metal cooling, the lower graphite cake of dismounting and graphite rod, cleaning welding slag, then polish flat high for weldering.
Embodiment two:
(1) damage zone is excised: from the downward-sloping excision in short-circuit busbar top, 4 °, angle of inclination, guarantees that on bus, damage field removes completely.
(2) prefabricated aluminium block is made, processing and polishing process is carried out on electrolysis surface: measure cut area size (length 220mm on short-circuit busbar, height 175mm, bottom side length 37mm) and connecting hole size (diameter 48mm), prefabricated aluminium block (length 220mm is made according to measurement size, height 175mm, bottom side length 22mm), prefabricated aluminium block treats that fusion face retains the inclination angle of 4 °, prefabricated aluminium block gets out the circular hole with connecting hole position, size match on short-circuit busbar, and on grinding machine, polishing process is carried out to the electrolysis (treating the fusion face back side) of prefabricated aluminium block.
(3) assembling before weldering: what prefabricated aluminium block is placed in short-circuit busbar is removed district, guarantee that prefabricated aluminium block polished face is concordant with short-circuit busbar facade, form V-type groove between prefabricated aluminium block and short-circuit busbar, and gap, V-type bottom land limit is 15mm.In the connecting hole of short-circuit busbar and prefabricated aluminium block, insert close-fitting graphite rod, V-type groove two ends graphite cake, across V-type groove, seals, and uses chamotte sealing-gap, to prevent molten metal excessive by graphite rod.Weld preheating is carried out to short-circuit busbar, prefabricated aluminium block, graphite cake, is preheating to 250 DEG C.Aperture kaolin below charging mould is sealed, and is placed on position to be welded.According to gap length to be welded, according to 43(Al powder): 19(CuO): 14(V2O5): 15(SnO2): 2(CaSO4): 4(B powder): mass percent 3(CaF2) prepares 4.5 kilograms of aluminium base self-propagating welding powders, load in charging mould, and sprinkle pyrophoric powders on its surface, insert lead-in wire.
(4) exothermic weld: some combustion wire, causes thermopositive reaction.After the catch fusing of charging mold bottom, high-temperature liquid metal flow into position to be welded by mould small hole at bottom part of feeding.
(5) after welding treatment: after molten metal cooling, the lower graphite cake of dismounting and graphite rod, cleaning welding slag, then polish flat high for weldering.
Embodiment three:
(1) damage zone is excised: from the downward-sloping excision in short-circuit busbar top, 5 °, angle of inclination, guarantees that on bus, damage field removes completely.
(2) prefabricated aluminium block is made, processing and polishing process is carried out on electrolysis surface: measure cut area size (length 220mm on short-circuit busbar, height 192mm, bottom side length 25mm) and connecting hole size (diameter 48mm), prefabricated aluminium block (length 220mm is made according to measurement size, height 192mm, bottom side length 10mm), prefabricated aluminium block treats that fusion face retains the inclination angle of 5 °, prefabricated aluminium block gets out the circular hole with connecting hole position, size match on short-circuit busbar, and on grinding machine, polishing process is carried out to the electrolysis (treating the fusion face back side) of prefabricated aluminium block.
(3) assembling before weldering: what prefabricated aluminium block is placed in short-circuit busbar is removed district, guarantee that prefabricated aluminium block polished face is concordant with short-circuit busbar facade, form V-type groove between prefabricated aluminium block and short-circuit busbar, and gap, V-type bottom land limit is 15mm.In the connecting hole of short-circuit busbar and prefabricated aluminium block, insert close-fitting graphite rod, V-type groove two ends graphite cake, across V-type groove, seals, and uses chamotte sealing-gap, to prevent molten metal excessive by graphite rod.Weld preheating is carried out to short-circuit busbar, prefabricated aluminium block, graphite cake, is preheating to 250 DEG C.Aperture kaolin below charging mould is sealed, and is placed on position to be welded.According to gap length to be welded, according to 103(Al powder): 34(CuO): 24(V2O5): 26(SnO2): 2(CaSO4): 6(B powder): mass percent 5(CaF2) prepares 4.8 kilograms of aluminium base self-propagating welding powders, load in charging mould, and sprinkle pyrophoric powders on its surface, insert lead-in wire.
(4) exothermic weld: some combustion wire, causes thermopositive reaction.After the catch fusing of charging mold bottom, high-temperature liquid metal flow into position to be welded by mould small hole at bottom part of feeding.
(5) after welding treatment: after molten metal cooling, the lower graphite cake of dismounting and graphite rod, cleaning welding slag, then polish flat high for weldering.
Embodiment four:
(1) damage zone is excised: from the downward-sloping excision in short-circuit busbar top, 5 °, angle of inclination, guarantees that on bus, damage field removes completely.
(2) prefabricated aluminium block is made, processing and polishing process is carried out on electrolysis surface: measure cut area size (length 220mm on short-circuit busbar, height 195mm, bottom side length 35mm) and connecting hole size (diameter 48mm), prefabricated aluminium block (length 220mm is made according to measurement size, height 195mm, bottom side length 15mm), prefabricated aluminium block treats that fusion face retains the inclination angle of 5 °, prefabricated aluminium block gets out the circular hole with connecting hole position, size match on short-circuit busbar, and on grinding machine, polishing process is carried out to the electrolysis (treating the fusion face back side) of prefabricated aluminium block.
(3) assembling before weldering: what prefabricated aluminium block is placed in short-circuit busbar is removed district, guarantee that prefabricated aluminium block polished face is concordant with short-circuit busbar facade, form V-type groove between prefabricated aluminium block and short-circuit busbar, and gap, V-type bottom land limit is 20mm.In the connecting hole of short-circuit busbar and prefabricated aluminium block, insert close-fitting graphite rod, V-type groove two ends graphite cake, across V-type groove, seals, and uses chamotte sealing-gap, to prevent molten metal excessive by graphite rod.Weld preheating is carried out to short-circuit busbar, prefabricated aluminium block, graphite cake, is preheating to 200 DEG C.Aperture kaolin below charging mould is sealed, and is placed on position to be welded.According to gap length to be welded, according to 103(Al powder): 34(CuO): 24(V2O5): 26(SnO2): 2(CaSO4): 6(B powder): mass percent 5(CaF2) prepares 6.5 kilograms of aluminium base self-propagating welding powders, load in charging mould, and sprinkle pyrophoric powders on its surface, insert lead-in wire.
(4) exothermic weld: some combustion wire, causes thermopositive reaction.After the catch fusing of charging mold bottom, high-temperature liquid metal flow into position to be welded by mould small hole at bottom part of feeding.
(5) after welding treatment: after molten metal cooling, the lower graphite cake of dismounting and graphite rod, cleaning welding slag, then polish flat high for weldering.
Claims (6)
1. the restorative procedure that do not have a power failure of aluminium electrolytic bath short circuit bus, is characterized in that, comprise the following steps:
1) damage zone is excised: tilted 3 ~ 5 ° from top by short-circuit busbar and excise l-shaped downwards, guarantee that on bus, damage field removes completely;
2) prefabricated aluminium block is made: according to the prefabricated aluminium block of area size cut on short-circuit busbar, prefabricated aluminium block treats that fusion face retains the inclination angle of 3 ~ 5 °, and be configured with the connecting hole with position, size match on short-circuit busbar, then polishing process is carried out to prefabricated aluminium block electrolysis;
3) assembling before weldering: what prefabricated aluminium block is placed in short-circuit busbar is removed district, guarantees that prefabricated aluminium block electrolysis is concordant with short-circuit busbar facade, inserts close-fitting graphite rod in the connecting hole of short-circuit busbar and prefabricated aluminium block; Between prefabricated aluminium block and short-circuit busbar, form V-type groove, V-type groove two ends graphite cake is sealed, and uses chamotte sealing-gap; Be placed in by charging mould on V-type groove, below aperture catch seals; According to gap length to be welded, take appropriate aluminium base self-propagating welding powder, load in charging mould, and sprinkle pyrophoric powders on its surface, insert lead-in wire;
4) exothermic weld: carry out weld preheating to short-circuit busbar, prefabricated aluminium block, graphite cake, then put combustion wire, causes thermopositive reaction, and after the catch fusing of charging mold bottom, high-temperature liquid metal flow into V-type groove by mould small hole at bottom part of feeding;
5) after welding treatment: after molten metal cooling, the lower graphite cake of dismounting and graphite rod, cleaning welding slag, then polish flat high for weldering.
2. the restorative procedure that do not have a power failure according to claim 1, is characterized in that, the charging mold material in step (3) is graphite.
3. the restorative procedure that do not have a power failure according to claim 1, is characterized in that, in step (3), preliminary heating device is the oxyacetylene welding equipment without the need to electricity consumption, avoids preheating flame directly to impact the surface to be welded of short-circuit busbar and prefabricated aluminium block.
4. the restorative procedure that do not have a power failure according to claim 1, is characterized in that, step is preheating to 200 ~ 300 DEG C in (3).
5. the restorative procedure that do not have a power failure according to claim 1, is characterized in that, the V-type trench bottom formed between prefabricated aluminium block and short-circuit busbar in step (3) has 10 ~ 20mm width.
6. aluminium electrolytic bath short circuit bus according to claim 1 does not have a power failure restorative procedure, it is characterized in that, aluminium base self-propagating welding powder component described in step (3) is by mass percentage: cupric oxide 17 ~ 19%, Vanadium Pentoxide in FLAKES 12 ~ 14%, tindioxide 13 ~ 15%, vitriol 1 ~ 2%, boron powder 3 ~ 4%, Calcium Fluoride (Fluorspan) 2.5 ~ 3%, all the other are aluminium powder.
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| CN106541246A (en) * | 2016-09-27 | 2017-03-29 | 新疆众和股份有限公司 | The method that aluminum cell bus-bar sweat soldering is repaired under electromagnetic field environment |
| CN108941883A (en) * | 2018-07-23 | 2018-12-07 | 武汉大学 | A kind of aluminium strain clamp in-situ remediation method using self-propagation seal technology |
| CN109262210A (en) * | 2018-10-29 | 2019-01-25 | 甘肃酒钢集团科力耐火材料股份有限公司 | A kind of aluminium electrolytic cell cathode bus burning powder welding procedure |
| CN112458500A (en) * | 2020-11-11 | 2021-03-09 | 内蒙古大唐国际呼和浩特铝电有限责任公司 | On-line repair method for cathode bus of electrolytic cell |
| CN113399866A (en) * | 2021-06-11 | 2021-09-17 | 武汉大学 | Aluminum electrolysis cell horizontal bus hot-line repair welding flux and preparation method thereof |
| CN113399930A (en) * | 2021-06-11 | 2021-09-17 | 武汉大学 | Method for carrying out electrified repair on horizontal aluminum bus |
| CN113399866B (en) * | 2021-06-11 | 2022-02-15 | 武汉大学 | Aluminum electrolysis cell horizontal bus hot-line repair welding flux and preparation method thereof |
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