CN109055987B - Method for sitting and stopping aluminum electrolytic cell - Google Patents
Method for sitting and stopping aluminum electrolytic cell Download PDFInfo
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- CN109055987B CN109055987B CN201811241437.9A CN201811241437A CN109055987B CN 109055987 B CN109055987 B CN 109055987B CN 201811241437 A CN201811241437 A CN 201811241437A CN 109055987 B CN109055987 B CN 109055987B
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- sitting
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- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 37
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000007788 liquid Substances 0.000 claims abstract description 29
- 238000002788 crimping Methods 0.000 claims abstract description 7
- 238000012545 processing Methods 0.000 claims abstract description 4
- 239000003792 electrolyte Substances 0.000 claims description 9
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical compound [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims description 4
- 239000008151 electrolyte solution Substances 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 239000000243 solution Substances 0.000 claims description 3
- 238000005868 electrolysis reaction Methods 0.000 claims 4
- 239000004411 aluminium Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electrolytic Production Of Metals (AREA)
Abstract
The invention discloses a method for stopping an aluminum electrolytic cell by sitting on the cell, which comprises the following steps: 1) confirming the number of the electrolytic cell needing to be stopped and the position of an anode bus; 2) measuring the total height of the liquid level of the electrolytic cell before stopping the cell, adjusting the total height of the liquid level to be less than 63% of the effective height of the hearth, then reducing the voltage in two steps, wherein the voltage is reduced to 3.5-3.6v in the first step, and the voltage is reduced to the target voltage of stopping the cell from 3.5-3.6v in one step in the second step; 3) loosening the upright post screw rods at the short-circuit openings of the upright posts, taking out the insulating plate, and performing ash removal treatment on the crimping surface of the upright post bus; 4) and (4) tightening the groove stopping screw, measuring and processing the pressure drop of the upright post bus with large pressure drop, and finishing the groove stopping work after the pressure drop is qualified. The invention is simple and safe in operation, improves the working efficiency of the tank stopping, is convenient to operate, and operates under the condition of a full series of current without influencing the production of a normal tank.
Description
Technical Field
The invention relates to the technical field of electrolytic aluminum production, in particular to a method for sitting and stopping an aluminum electrolytic cell.
Background
The electrolytic aluminum plant of Guangxi Hua Lei New Material Limited company is put into production in 2017, 9 and 25 days, the electrolytic cell stopping operation of the Hua Lei company uses two uninterrupted groove stopping devices of Guizhou Innovative light metal process equipment engineering research center Limited company to carry out power-on and groove stopping operation, and the working process flow chart of the uninterrupted groove stopping devices is as follows: installing peripheral components: removing the two short circuit block insulating bolts on all the stand columns, and keeping the two short circuit block insulating screws on the lower part in a loose state; the overhead traveling crane sequentially lifts the starting and stopping groove devices to the stations, the operator controls the lifting posture of the devices to ensure that the positioning wheels are tightly attached to the back of the upright post in place and ensure that the U-shaped opening of the opening and closing rod and the short circuit block are positioned; the short block push rod clamp is installed in place. No-load and no-contact test run: connecting each operating unit cable to the control cabinet; and testing the actions of the commutation switch and the short circuit port mechanical switching mechanism under the condition that the device is in a no-load and no-contact state, and carrying out the next installation after the actions are correct. And thirdly, confirming that the switch is in an off state: an operator pushes the current conversion switch to press the stand column crimping copper plate close to the stand column bus and tightly press the stand column busbar on the stand column by using the stand column arch-shaped clamp; the copper soft belt crimping end is attached to the upper top surface of the short circuit block and is pressed tightly by a crimping fixing clamp; and (3) installing a short circuit block push rod ratchet wheel, and checking and adjusting the distance (1.5-3.5 cm) between the short circuit block and the stand column. Fourthly, remotely closing the switch group and the short circuit port: after people are confirmed to evacuate, the command conductor closes the current conversion switch group through the control cabinet; the operator pulls out the side-inserted insulating plate; the command length closes the short circuit port through the control cabinet, so that the short circuit block is changed into a mechanical compression state from being opened. And fifthly, compressing the short circuit block by bolts: an operator inserts and screws the two short circuit block steel bolts on the upper side, so that the short circuit blocks and the upright posts are changed from mechanical compression into double-bolt compression; detaching the ratchet wheel of the short circuit block push rod and retracting the opening and closing rod; an operator inserts and screws the two short circuit block steel bolts below the short circuit block steel bolts, so that the short circuit block and the upright post are changed from double-bolt pressing to four-bolt pressing. Sixthly, the switch group is disconnected: after the confirmed personnel evacuate, the commander passes through the control cabinet to disconnect the current conversion switch group, and the observer checks and confirms the disconnection of the switch. Dismantling the device: and (4) sequentially removing the short circuit block push rod clamp, the short circuit block arc clamp and the stand column bus arc clamp, inserting the original insulating box, sequentially lifting the device away, and stopping the tank.
The process flow of the uninterrupted groove stopping device is complicated to operate, the preparation work exceeds more than one hour each time, the operation can be carried out by specially trained skilled workers, and the operation labor intensity is high.
Disclosure of Invention
The invention provides a method for stopping an aluminum electrolytic cell by sitting on the cell, which is a cell stopping technology with simple and safe operation and improved cell stopping working efficiency, is convenient to operate, operates under the condition of a full series of current and does not influence the production of a normal cell.
The technical scheme of the invention is as follows:
the invention discloses a method for sitting and stopping an aluminum electrolytic cell, which comprises the following steps:
1) confirming the number of the electrolytic cell needing to be stopped and the position of an anode bus;
2) measuring the total height of the liquid level of the electrolytic cell before stopping the cell, adjusting the total height of the liquid level to be less than 63% of the effective height of the hearth, then reducing the voltage in two steps, wherein the voltage is reduced to 3.5-3.6v in the first step, and the voltage is reduced to the target voltage of stopping the cell from 3.5-3.6v in one step in the second step;
3) loosening the upright post screw rods at the short-circuit openings of the upright posts, taking out the insulating plate, and performing ash removal treatment on the crimping surface of the upright post bus;
4) and (4) tightening the groove stopping screw, measuring and processing the pressure drop of the upright post bus with large pressure drop, and finishing the groove stopping work after the pressure drop is qualified.
Further, the electrolytic bath solution in the step 2) is divided into two layers, the lower layer is aluminum liquid, the upper layer is electrolyte solution, and the heights of the aluminum liquid and the electrolyte solution are respectively adjusted when the total height of the liquid level is adjusted, wherein the horizontal height of the aluminum is adjusted to be less than 45% of the effective height of the hearth, and the height of the electrolyte is adjusted to be less than 18% of the effective height of the hearth.
Further, in the step 3), the method for adjusting the total height of the liquid level includes: and respectively pumping the aluminum liquid and the electrolyte liquid from the electrolytic bath through a pump.
Further, the aluminum cell is a 500kA aluminum cell.
Further, the total height of the hearth of the electrolytic cell is 60cm, wherein the effective hearth height is 58 cm.
Further, the total height of the liquid level is adjusted to be less than 35cm in the step 2).
Further, the height of the aluminum liquid in the step 2) is adjusted to be below 25cm, and the height of the electrolyte is adjusted to be below 10 cm.
Further, in the step 3), the target voltage is 1.0-1.3 v.
The short-circuit port of the groove stopping has the phenomenon that a small amount of sparks are generated by current at the moment of contact, the personal protection article is worn, the groove stopping operation time is about 10 minutes, and the whole operation is safe and controllable.
The working principle of the invention is as follows:
because the electrolytic series current loop is composed of electrolytic cells in series connection, wherein the voltage formed by the voltage of the electrolytic cell of 500kA in the preliminary design = anode + interelectrode + cathode + counter electromotive force + peri-cell bus + other (series bus and effect are shared), the operation principle of the sitting bath and the stopping of the bath is realized by using the short circuit principle of a local loop of a single electrolytic cell, namely, when the electrolytic cell is in short circuit, the interelectrode voltage, the counter electromotive force voltage and other (series bus and effect are shared) voltages do not exist, so that the sitting bath and the stopping of the bath are realized; the specific operation is according to claim 1, item 3), and the working voltage is reduced to the target voltage of the dead slot of 1.0v (close to the theoretical voltage of 0.836 v).
Cell voltage: v =0.359+1.410+0.247+1.650+0.230+0.025=3.921V
When the electrolytic cell is in a sitting state: cell voltage = anode + cathode + cell circumference bus, both short cell voltage: v =0.359+0.247+0.230=0.836V
Therefore, when the anode and the cathode are in short circuit, the main current of the electrolytic cell is conducted away from the anode to the cathode, and the short-circuit port of the vertical column bus is operated, so that the operation of stopping the cell without power failure is realized.
The invention has the beneficial effects that:
the method does not need any additional material and equipment, is simple to operate, low in cost, suitable for stopping the electrolytic bath by using a large electrolytic bath, economic and environment-friendly; the cost is low, the operation time is short, the labor intensity of operators is reduced, the working efficiency is improved, and the industrial popularization has more practical significance.
The invention has simple and easy technical process, reasonable design, safety and reliability, overcomes the original technical defects on the premise of not changing the current production equipment, can operate under the condition of full series of current, does not influence the production of a normal tank, and has obvious economic benefit.
Detailed Description
The present invention will be described in detail below with reference to specific examples.
Example 1
The invention discloses a method for stopping an aluminum electrolytic cell by sitting on the cell, which comprises the following steps:
1) confirming the number of the electrolytic cell needing to be stopped and the position of an anode bus;
2) the electrolytic cell is a 500kA electrolytic cell, the total height of the hearth of the electrolytic cell is 60cm, and the height of the effective hearth is 58 cm; the electrolytic bath solution is divided into two layers, wherein the lower layer is aluminum liquid, and the upper layer is electrolyte liquid; measuring the total height of the liquid level of the electrolytic cell before stopping the electrolytic cell, and respectively pumping the aluminum liquid and the electrolyte liquid from the electrolytic cell through a pump to adjust the total height of the liquid level to 33cm as the effective height of the hearth, wherein the height of the aluminum liquid is adjusted to 23cm, and the height of the electrolyte is adjusted to 10 cm; then, voltage reduction is carried out in two steps, the voltage is reduced to 3.5-3.6v in the first step, and the voltage is reduced to 1.0v from 3.5v to the target voltage of the tank stop at one time in the second step;
3) loosening the upright post screw rods at the short-circuit openings of the upright posts, taking out the insulating plate, and performing ash removal treatment on the crimping surface of the upright post bus;
4) and (4) tightening the groove stopping screw, measuring and processing the pressure drop of the upright post bus with large pressure drop, and finishing the groove stopping work after the pressure drop is qualified.
And (3) benefit analysis:
1. economic benefits
(1) After the method for sitting and stopping the aluminum electrolytic cell is put into use, the operation can be finished by only 10-12 persons, so that part of labor force can be saved; and the time of the operation of stopping the tank is about 10 minutes, which is 50 minutes shorter than the 1 hour using a non-stop device.
(2) After the method for stopping the aluminum electrolytic cell by sitting on the bath is put into use, no power-off device (400 ten thousand/station) needs to be purchased, and the expenditure of spare part purchasing and maintenance cost is also needed at ordinary times for the power-off device.
2. Social benefits
After the method for stopping the aluminum electrolytic cell by sitting the electrolytic cell is put into use, the method greatly changes the current domestic electrolytic cell stopping mode, has simple operation of stopping the electrolytic cell, saves a large amount of manpower and material resources, greatly improves the working efficiency of stopping the electrolytic cell, and has obvious social benefit if being popularized to the electrolytic aluminum industry.
3. Environmental protection benefit
The method for sitting and stopping the aluminum electrolytic cell does not need any material, and has simple, safe and efficient operation; meanwhile, the technology does not produce pollutants and harmful gases in use, has obvious environmental protection effect and wide application prospect.
Claims (6)
1. A method for stopping an aluminum electrolysis cell by sitting on the cell is characterized by comprising the following steps:
1) confirming the number of the electrolytic cell needing to be stopped and the position of an anode bus;
2) measuring the total height of the liquid level of the electrolytic cell before stopping the cell, adjusting the total height of the liquid level to be less than 63% of the effective height of the hearth, then reducing the voltage in two steps, wherein the voltage is reduced to 3.5-3.6v in the first step, and the voltage is reduced to the target voltage of stopping the cell from 3.5-3.6v in one step in the second step; the target voltage is 1.0-1.3 v;
3) loosening the upright post screw rods at the short-circuit openings of the upright posts, taking out the insulating plate, and performing ash removal treatment on the crimping surface of the upright post bus;
4) tightening a groove stopping screw, measuring and processing the pressure drop of the upright post bus with large pressure drop, and finishing groove stopping work after the pressure drop is qualified;
and 2) the electrolytic bath solution is divided into two layers, the lower layer is aluminum liquid, the upper layer is electrolyte solution, and the heights of the aluminum liquid and the electrolyte solution are respectively adjusted when the total height of the liquid level is adjusted, wherein the horizontal height of the aluminum is adjusted to be less than 45% of the effective height of the hearth, and the height of the electrolyte is adjusted to be less than 18% of the effective height of the hearth.
2. The method for sitting and stopping the aluminum electrolysis cell according to claim 1, wherein: in the step 2), the method for adjusting the total height of the liquid level comprises the following steps: and respectively pumping the aluminum liquid and the electrolyte liquid from the electrolytic bath through a pump.
3. The method for sitting and stopping the aluminum electrolysis cell according to claim 1, wherein: the aluminum cell is a 500kA aluminum cell.
4. A method of sitting and stopping a cell in an aluminium electrolysis cell according to claim 3, wherein: the total height of the hearth of the electrolytic cell is 60cm, wherein the effective hearth height is 58 cm.
5. The method for sitting and stopping the aluminum reduction cell according to claim 4, wherein: and in the step 2), the total height of the liquid level is adjusted to be less than 35 cm.
6. The method for sitting and stopping the aluminum reduction cell according to claim 4, wherein: in the step 2), the height of the aluminum liquid is adjusted to be below 25cm, and the height of the electrolyte is adjusted to be below 10 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811241437.9A CN109055987B (en) | 2018-10-24 | 2018-10-24 | Method for sitting and stopping aluminum electrolytic cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811241437.9A CN109055987B (en) | 2018-10-24 | 2018-10-24 | Method for sitting and stopping aluminum electrolytic cell |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109055987A CN109055987A (en) | 2018-12-21 |
| CN109055987B true CN109055987B (en) | 2020-10-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811241437.9A Active CN109055987B (en) | 2018-10-24 | 2018-10-24 | Method for sitting and stopping aluminum electrolytic cell |
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| CN (1) | CN109055987B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110592617B (en) * | 2019-08-29 | 2021-06-15 | 青海物产工业投资有限公司 | Secondary starting method for full-series power failure of aluminum electrolysis cell |
| CN113755893B (en) * | 2021-09-15 | 2024-04-30 | 内蒙古锦联铝材有限公司 | Processing method for dealing with long-time large-amplitude load reduction of aluminum electrolysis series |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5698491A (en) * | 1980-01-08 | 1981-08-07 | Mitsubishi Keikinzoku Kogyo Kk | Operating method of aluminum electrolytic cell |
| CN1772958A (en) * | 2004-11-11 | 2006-05-17 | 梁学民 | Apparatus and method for aluminium electrolysing series uninterruption Stop (opening) electrolytic tank |
| CN201334531Y (en) * | 2008-12-02 | 2009-10-28 | 北方工业大学 | Novel potline stop-start shunting device and system |
| CN104514029A (en) * | 2013-09-30 | 2015-04-15 | 林州市林丰铝电有限责任公司 | Large-scale electrolytic tank outage-free shutting method |
| CN104862741A (en) * | 2015-06-05 | 2015-08-26 | 青海百河铝业有限责任公司 | Method for stopping a cell under situation of no power-off of aluminum electrolytic cell |
-
2018
- 2018-10-24 CN CN201811241437.9A patent/CN109055987B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5698491A (en) * | 1980-01-08 | 1981-08-07 | Mitsubishi Keikinzoku Kogyo Kk | Operating method of aluminum electrolytic cell |
| CN1772958A (en) * | 2004-11-11 | 2006-05-17 | 梁学民 | Apparatus and method for aluminium electrolysing series uninterruption Stop (opening) electrolytic tank |
| CN201334531Y (en) * | 2008-12-02 | 2009-10-28 | 北方工业大学 | Novel potline stop-start shunting device and system |
| CN104514029A (en) * | 2013-09-30 | 2015-04-15 | 林州市林丰铝电有限责任公司 | Large-scale electrolytic tank outage-free shutting method |
| CN104862741A (en) * | 2015-06-05 | 2015-08-26 | 青海百河铝业有限责任公司 | Method for stopping a cell under situation of no power-off of aluminum electrolytic cell |
Non-Patent Citations (1)
| Title |
|---|
| "240KA预焙铝电解槽不停电停槽操作实践";康炜;《科技创新与应用》;20140828(第2014-24期);第14页 * |
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