CN104711641A - Electrified shunt welding method for cathode soft belt of electrolytic cell - Google Patents
Electrified shunt welding method for cathode soft belt of electrolytic cell Download PDFInfo
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- CN104711641A CN104711641A CN201510073344.XA CN201510073344A CN104711641A CN 104711641 A CN104711641 A CN 104711641A CN 201510073344 A CN201510073344 A CN 201510073344A CN 104711641 A CN104711641 A CN 104711641A
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C3/00—Electrolytic production, recovery or refining of metals by electrolysis of melts
- C25C3/06—Electrolytic production, recovery or refining of metals by electrolysis of melts of aluminium
- C25C3/08—Cell construction, e.g. bottoms, walls, cathodes
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Abstract
The invention discloses an electrified shunt welding method for a cathode soft belt of an electrolytic cell. The method includes the following steps: firstly cleaning the connecting surface between a cell periphery bus and the soft belt; mounting a high-current switch at the short bus joint; measuring the initial temperatures of the pressure welding juncture at the short upright joint, the electrified cell periphery bus and the welding joint of the cell bottom bus; then operating the high-current switch to disconnect the short circuit joint, and inserting an insulation insert plate; measuring the welding temperatures of the short circuit block pressure welding juncture, the corresponding cell periphery bus and the welding joint of the cell bottom bus; moving the high-current switch away, starting welding and monitoring the welding temperatures of the short circuit block pressure welding juncture, the corresponding cell periphery bus and the welding joint of the cell bottom bus; enabling the short circuit joint to be short connected after the welding is completed. The method provided by the invention adopts the electrified shunt soft belt welding technology; according to the different thrust positions of the soft belt, the high-current switch is mounted nearby to disconnect the short circuit joint, so that the impact of the magnetic field on the welding operation is reduced, and the welding quality is improved; the welding joint temperature and the pressure drop value after the welding are basically the same as those for a normal soft belt, and the impact of power cut or limited power on series of electrolytic cells, so that the economic loss is effectively reduced, and normal production conditions are met.
Description
Technical field
The present invention relates to electrolysis of aluminum process field, the particularly charged shunting welding technique application of a kind of 400KA electric tank cathode soft ribbons.
Background technology
The electrolyzer put into production, by factors such as initial design, brickwork starting material, brickwork quality, roasting and starting, normal production managements, affect cell life, emphasis maintenance management postmenstruation is also difficult to reach the requirement in age of design groove, easily there is the situation such as early damage or runout, when there is rod iron runout and sidepiece runout, though adopt runout plate washer to protect bus, prick the measures such as stifled, the high temperature aluminum liquid spilt easily thrusts bath circumference bus soft ribbons; The bath circumference bus soft ribbons thrust during overhaul is difficult to repair under the impact of upfield.Design of electrolysis cells theory is mainly centered by " three ", wherein different to the soft ribbons sheet number that the design in magnetic field causes from rod iron connects, soft ribbons welding after thrusting needs the time to differ, for the impact reducing magnetic field welding quality takes serial load down or series to have a power failure, but larger on whole serial electrolyzer impact; And in welding process, easily there is rosin joint, sealing-off or the not full phenomenon of weldering meat, cause weld pressure drop to raise, hide some dangers for safety in production.
Therefore a kind of method for repairing and mending that just can realize soft ribbons that do not need to stop to ration the power supply is needed.
Summary of the invention
In view of this, technical problem to be solved by this invention is to provide the charged method for repairing and mending of a kind of electrolyzer soft ribbons.
The object of the present invention is achieved like this:
The charged shunting welding process of a kind of electric tank cathode soft ribbons provided by the invention, comprises the following steps:
S1: cleaning bath circumference bus and soft ribbons connecting surface;
S2: soft ribbons is arranged by docking length;
S3: install high-current switch at busbar short-circuit mouth place;
S4: measure and record each short-circuit opening seam, cross the initial temperature of soldered of electric bath circumference bus, bottom land bus;
S5: operation high-current switch, disconnects the short-circuit opening at high-current switch place, plug insulation insertion plate, and the voltage detecting electrolyzer has without exception; If be as good as, then carry out next step;
S6: high-current switch handling is left, and welding groove circumference bus and soft ribbons;
S7: the welding temperature measuring each short-circuit block seam, corresponding groove circumference bus, bottom land bus soldered;
S8: compare welding temperature and initial temperature, if welding temperature is increased beyond predetermined threshold value, then stops welding operation by short-circuit opening short circuit;
S9: welded, to the busbar short-circuit mouth short circuit at high-current switch place;
S10: after electrolyzer energising starts, tracking measurement temperature at weld changing conditions also carries out correcting process.
Further, the soft ribbons in described step S2 is arranged to " S " type.
Further, the voltage detecting front and back electrolyzer in described step S5 is carrying out when voltage is risen to 0.567V by 0.26V.
Further, the predetermined threshold value in described step S8 is 150 DEG C.
Beneficial effect of the present invention is: the present invention adopts shunting band electric welding soft ribbons technology, according to thrusting soft ribbons different positions, take that high-current switch is installed nearby and open-circuit operation is carried out to short-circuit opening, thus reduce the impact of magnetic field on welding operation, improve welding quality, the rear weld seam temperature of welding, voltage drop value are substantially identical with normal soft ribbons, reduce and stop the impact brought serial electrolyzer of rationing the power supply, effectively reduce financial loss; Meet normal production conditions.
Accompanying drawing explanation
In order to make the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail, wherein:
The electric tank cathode soft ribbons charged shunting welding process schema that Fig. 1 provides for the embodiment of the present invention.
Embodiment
Hereinafter with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail.Should be appreciated that preferred embodiment only in order to the present invention is described, instead of in order to limit the scope of the invention.
Embodiment 1
The electric tank cathode soft ribbons charged shunting welding process schema that Fig. 1 provides for the embodiment of the present invention, as shown in the figure:
S1: cleaning bath circumference bus and soft ribbons connecting surface;
S2: soft ribbons is arranged by docking length;
S3: install high-current switch at busbar short-circuit mouth place;
S4: measure and record each short-circuit opening seam, cross the initial temperature of soldered of electric bath circumference bus, bottom land bus;
S5: operation high-current switch, disconnects the short-circuit opening at high-current switch place, plug insulation insertion plate, and the voltage detecting electrolyzer has without exception; If be as good as, then carry out next step;
S6: high-current switch handling is left, and welding groove circumference bus and soft ribbons;
S7: the welding temperature measuring each short-circuit block seam, corresponding groove circumference bus, bottom land bus soldered;
S8: compare welding temperature and initial temperature, if welding temperature is increased beyond predetermined threshold value, then stops welding operation by short-circuit opening short circuit;
S9: welded, to the busbar short-circuit mouth short circuit at high-current switch place;
S10: after electrolyzer energising starts, tracking measurement temperature at weld changing conditions also carries out correcting process.
Soft ribbons in described step S2 is arranged to " S " type.
Before and after detecting in described step S5, the voltage of electrolyzer is carrying out when voltage is risen to 0.567V by 0.26V.
Predetermined threshold value in described step S8 is 150 DEG C.
Embodiment 2
The difference of the present embodiment and embodiment 1 is only:
The electrolyzer that the present embodiment adopts is 420KA aluminium cell, carries out charged shunting welding process, comprise the following steps electric tank cathode soft ribbons:
S1: cleaning bath circumference bus and soft ribbons connecting surface;
S2: soft ribbons is arranged by docking length;
S3: install high-current switch at the 5th root post busbar short-circuit mouth place;
S4: measure and record first, second, third and fourth, six roots of sensation column short-circuit opening seam, cross the initial temperature of soldered of electric bath circumference bus, bottom land bus;
S5: operation high-current switch, disconnects the 5th short-circuit opening, plug insulation insertion plate, and before and after detecting, the voltage of two grooves has without exception; If be as good as, then carry out next step;
S6: high-current switch handling is left, welds;
S7: measure first, second, third and fourth, the welding temperature of six roots of sensation short-circuit block seam, corresponding groove circumference bus, bottom land bus soldered;
S8: compare welding temperature and initial temperature, if welding temperature is increased beyond predetermined threshold value, then stops welding operation by short-circuit opening short circuit;
S9: welded, carries out the 5th root post busbar short-circuit mouth short circuit;
S10: after electrolyzer energising starts, tracking measurement temperature at weld changing conditions also carries out correcting process.
Soft ribbons in described step S2 is arranged to " S " type.
Before and after detecting in described step S5, the voltage of two grooves is carrying out when voltage is risen to 0.567V by 0.26V.
Predetermined threshold value in described step S8 is 150 DEG C.
420KA aluminium cell-1020# affects by early damage, occurs leak accident, and high temperature aluminum liquid washes out bath circumference bus soft ribbons, for ensureing serial electrolyzer stably manufactured, adopts charged shunting repairing technique during overhaul;
Prepare before shunting
Work tool prepares: high-current switch group 1 is overlapped, pneumatic wrench, infrared temperature measurement gun, Current distribution in anode meter, emergent airduct 2 overlap, Insulation crowbar 4, pneumatic polishing machine 1 handle, industrial electric fan, argon welder 1, short circuit port insulation insertion plate 2, volt ohm-milliammeter, recorder;
Concrete operations:
First A19 location groove circumference bus and soft ribbons connecting surface being cleaned out, by the soft ribbons made in advance by docking length, using plank to beat into " S " type, for welding saves time; At the 5th root post busbar short-circuit mouth place, high-current switch 1 group is installed, concrete execution by " high-current switch working specification " (selects short-circuit opening open position to take and soft ribbons nearby principle, for better armoured magnetic field power, be conducive to improving welding quality).Before operation high-current switch, to first, second, third and fourth, six roots of sensation column short-circuit opening seam, cross electric bath circumference bus, all soldered temperature surveys of bottom land bus, and to make a record; Operation high-current switch, disconnects the 5th short-circuit opening, plugs insulation insertion plate, observe voltage change situation, wherein 1020# voltage rises to 0.567V by 0.26V, to two, front and back groove carry out check measurement without exception after, high-current switch handling opened, rapid tissue welding personnel weld; In welding process, arrange special messenger carry out first, second, third and fourth, six roots of sensation short-circuit block seam, corresponding groove circumference bus, the temperature survey of bottom land bus soldered, with original value changes in contrast value, as occurred, weld seam temperature rises too high (being greater than 150 DEG C), welding operation must be stopped short-circuit opening short circuit, prevent abnormal conditions from occurring; Within about 1 hour, weld, carried out the 5th root post busbar short-circuit mouth short circuit; (can direct control, because bath voltage is at 0.567V, require bath voltage < 0.7v according to " 420KA electrolytic bath cathode bus (soft ribbons) working specification ")
Effect after welding and late detection
Continuous three days tracking measurement temperature at weld changing conditions after electrolyzer energising starts, weld pressure drop and the pressure drop of normal soft ribbons weld, temperature conditions, as following table: (the rear take off data of energising)
| 1020(A19) | New soldered | Newly connect soft ribbons | Former soldered | Normal soft ribbons |
| Temperature (DEG C) | 95 | 59 | 99 | 58 |
| Equidistant voltage drop value (mv) | 5.8 | 0.5 | 3.3 | 1.1 |
Five, the economic benefit of charged shunting welding technique generation
As adopted the method for welding, weld after load down, its welding pressure drop is not estimated, after electric current falls in series, primary aluminum output reduces, electrolyzer is frequent generating effect easily, causes the larger entire effect to electrolyzer of energy loss as follows: (to disregard electrical network, electric current is down to 280KA, on average rise 0.3 by effect coefficient, effect voltage 25 volts, Effect time 3 minutes, welded for 1 hour) loss that causes to series:
400KA hourly output: 0.3355*1*400*296*0.93/1000=36.94t
280KA hourly output: 0.3355*1*280*296*0.93/1000=25.85t
Output reduces: 36.94-25.85=11.09t
Output financial loss: 11.09*14050=15.58 ten thousand yuan
Effect coefficient raises the electricity increased: 400* (25-4) * 3*296*0.3/60=37296 degree
The electricity charge are lost: 12432*0.4=1.518 ten thousand yuan
Auxiliary material loss (effect rod): 296*0.3*3 (root) * 7=0.186 ten thousand yuan
Series is saved loss and is amounted to: 15.58+1.518+0.186=17.284 ten thousand yuan
Adopt charged shunting welding technique, effectively solve because the accidents such as bakie thrust a soft ribbons welding difficult problem, also can be applicable to cause thrusting because runout is excessive wear the bath circumference bus that groove bus maybe cannot carry out pouring into a mould repairing; This technology can continue to apply on 420KA aluminium cell.
What finally illustrate is, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although by referring to the preferred embodiments of the present invention, invention has been described, but those of ordinary skill in the art is to be understood that, various change can be made to it in the form and details, and not depart from the spirit and scope that the present invention limits.
Claims (4)
1. the charged shunting welding process of electric tank cathode soft ribbons, is characterized in that: comprise the following steps:
S1: cleaning bath circumference bus and soft ribbons connecting surface;
S2: soft ribbons is arranged by docking length;
S3: install high-current switch at busbar short-circuit mouth place;
S4: measure and record each short-circuit opening seam, cross the initial temperature of soldered of electric bath circumference bus, bottom land bus;
S5: operation high-current switch, disconnects the short-circuit opening at high-current switch place, plug insulation insertion plate, and the voltage detecting electrolyzer has without exception; If be as good as, then carry out next step;
S6: high-current switch handling is left, and welding groove circumference bus and soft ribbons;
S7: the welding temperature measuring each short-circuit block seam, corresponding groove circumference bus, bottom land bus soldered;
S8: compare welding temperature and initial temperature, if welding temperature is increased beyond predetermined threshold value, then stops welding operation by short-circuit opening short circuit;
S9: welded, to the busbar short-circuit mouth short circuit at high-current switch place;
S10: after electrolyzer energising starts, tracking measurement temperature at weld changing conditions also carries out correcting process.
2. the charged shunting welding process of electric tank cathode soft ribbons according to claim 1, is characterized in that: the soft ribbons in described step S2 is arranged to " S " type.
3. the charged shunting welding process of electric tank cathode soft ribbons according to claim 1, is characterized in that: before and after detecting in described step S5, the voltage of electrolyzer is carrying out when voltage is risen to 0.567V by 0.26V.
4. the charged shunting welding process of electric tank cathode soft ribbons according to claim 1, is characterized in that: the predetermined threshold value in described step S8 is 150 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510073344.XA CN104711641A (en) | 2015-02-12 | 2015-02-12 | Electrified shunt welding method for cathode soft belt of electrolytic cell |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510073344.XA CN104711641A (en) | 2015-02-12 | 2015-02-12 | Electrified shunt welding method for cathode soft belt of electrolytic cell |
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| CN104711641A true CN104711641A (en) | 2015-06-17 |
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Application publication date: 20150617 |