CN101328595B - Productive cell shutting method of aluminum cell - Google Patents
Productive cell shutting method of aluminum cell Download PDFInfo
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- CN101328595B CN101328595B CN2008100554897A CN200810055489A CN101328595B CN 101328595 B CN101328595 B CN 101328595B CN 2008100554897 A CN2008100554897 A CN 2008100554897A CN 200810055489 A CN200810055489 A CN 200810055489A CN 101328595 B CN101328595 B CN 101328595B
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Abstract
The invention relates to the aluminum electrolytic cell technical field, in particular relating to a protective cell-shutting method of an aluminum electrolytic cell. The method aims to solve the problems of cracking, deformation and doming up, etc. caused by an inner lining directly exposed in the air during the prior cell shutting, and comprises the following steps that: (1) part aluminum liquid inside an electrolytic cell is pumped out at first; (2) then, part electrolyte liquid inside the electrolytic cell is taken out; (3) an anode is put into the aluminum liquid and is raised after all aluminum liquid is pumped out, and thermocouples are distributed inside the electrolytic cell; (4) the surface of the anode is provided with an alumina heat-preservation material, and a feeding port and an aluminum outlet are sealed closely; moreover, a cell cover plate is covered; (5) a purifying smoke evacuation pipe is closed, and rockwool is used to cork up a side heat dissipation hole of a basin and to carry out bottom heat preservation; a factory building, a trench window and an air grid section are closed, and a window inside a closed workshop is closed; and (6) when temperature inside the electrolytic cell is lowered to normal temperature, cell shutting is completed. The protective cell-shutting method ensures reasonable gradient lowering of the temperature of an electrolytic cell inner lining, and reduces inner lining damage caused during cell shutting; meanwhile, the method has better anodic protection, strong commonality, simple operation and outstanding effects, and can continue to be used.
Description
Technical field
The present invention relates to the aluminium cell technical field, the protectiveness that is specially a kind of aluminium cell is stopped the groove method.
Background technology
Large-sized prebaked electrolyzer is the major equipment of Aluminum Electrolysis Production, and the quality of its operation is directly connected to the production efficiency of electrolytic aluminum.Because aluminum electrolysis industry is the high energy consumption industry, under electricity shortage or accidental state, often run into electrolyzer and stop groove and restarting, perhaps electrolyzer reaches and just need stop groove after certain life-span and carry out large repairs.Known, the quality that electrolyzer stops groove directly influences the cleaning and the repairing of electrolyzer, the prolongation in the success of electrolyzer restarting and cathode inner lining work-ing life is played a part very important, directly influences economic benefit of enterprises.In order to ensure the restarting success ratio of electrolyzer and the work-ing life of cathode inner lining, reduce financial loss, take the protectiveness technical measures just to seem most important when stopping groove.
As everyone knows, electrolyzer mainly comprises groove superstructure, pot shell and inner lining structure, and groove top hangs with tens groups of anodes, and the material of packing into before the energising enters ordinary production by roasting and starting.Material after chemical reaction in the electrolyzer, upper strata are electrolyte solution, and lower floor is at cathode bottom precipitating metal aluminium.Traditional groove method of stopping is after electrolyzer aluminium liquid is drained, anode directly to be hung away, does not suitably reach rational protective measure, and cell lining directly is exposed in the air.Like this, the cell lining that is under the condition of high temperature directly contacts with room temperature, the stress relief of groove liner is fast, and significantly the temperature difference makes the groove liner big crack, distortion, protuberance occur, directly influences the work-ing life of electrolyzer restarting success ratio and cathode inner lining.
Summary of the invention
The present invention does not take suitably rational protective measure to cause cell lining to be directly exposed in the air, problems such as crack, distortion, protuberance to occur to cause the groove liner in order to solve when existing aluminium cell stops groove, provides a kind of protectiveness of aluminium cell to stop the groove method.
The present invention adopts following technical scheme to realize: a kind of protectiveness of aluminium cell is stopped the groove method, may further comprise the steps: (1) extracts the part aluminium liquid in the groove earlier out, and aluminium liquid height is remained between the 10-15cm; (2) take out part electrolyte solution in the groove again, make electrolyte solution remain on 10-12cm; Stop extracting the part electrolyte solution earlier out before the groove, extract whole aluminium liquid more as much as possible out, do so mainly based on following consideration: remaining electrolyte solution forms layer protecting film at cathode surface, slowing down cathode liner radiating rate, prevent that the aluminium amount too much increases the sidepiece heat radiation in the groove, weaken heat insulation effect; Avoid too much aluminium liquid to the negative electrode seepage simultaneously, prevent that clearly anticathode causes secondary damage in the groove process.(3) anode is fallen in the aluminium liquid, extract whole aluminium liquid out after, the lifting anode makes electrolyte solution in the anode releasing slots.Because the electrolyzer top is provided with tens groups of anodes, when getting rid of aluminium liquid, it is immersed in the aluminium liquid, with the extruding of aluminium liquid, force aluminium liquid to be drained as far as possible only; (4) in time add insulation material at anode surface, reduce the heat radiation on anode top, the uniform decrease in temperature that makes full use of anodic heat anticathode liner is made necessary contribution; All obturaged in feed opening, aluminium flowing-out mouth position then, build the electrolytic bath cover plate, with whole electrolyzer complete closed, make itself and outside atmosphere slowly carry out thermal exchange, the assurance electrolyzer is slowly lowered the temperature; (5) in time close the purification smoke discharging pipe, with rock wool shutoff electrolyzer sidepiece louvre, with rock wool the bottom is incubated simultaneously, to reduce the electrolyzer heat radiation; Closed workshop, trench window and style plate are closed window in the tight workshop, reduce the airiness of electrolysis bath circumference; (6) treat that temperature is reduced to normal temperature in the electrolyzer, promptly finish and stop groove, hang out anode then, begin clear groove.
The described groove regular degree of tightness anode jig after 48 hours that stops in time discharges the stress between anode and the liner, prevents the groove superstructure owing to stressedly excessively cause distortion, damage.
In above-mentioned steps, behind the lifting anode, distributed heat galvanic couple in electrolyzer is so that monitor electrolyzer interior temperature variation and rate of temperature fall at any time.
The insulation material of described anode surface can be existing commercially available a lot of materials, but the insulation material of anode surface described in the utility model is an aluminum oxide, because aluminum oxide is the electrolytic aluminum main raw material, produces unnecessary trouble in the time of can effectively avoiding follow-up clear groove.
Adopt method of the present invention to stop groove; overcome routine and stop of the influence of groove method electrolyzer; stop the temperature distribution history of cathode inner lining before the groove in conjunction with electrolyzer; the contraction of each material; heat dissipation characteristics and the economic time that stops groove; a kind of cell body radiating rate of controlling in temperature-fall period is proposed; pot shell and cathode inner lining stress energy are slowly discharged; avoid cathode inner lining shrinkage crack to occur as far as possible; reduced the inner lining damage that causes when stopping groove; the pot shell deformation extent is less after stopping groove; the furnace bottom bump height is lower, the negative electrode crack; disrepair phenomenon is few; the few protectiveness of lateral mass cracking is stopped the groove technology, and stopping the groove soak is 15-20 days; the cell lining temperature is rationally slowly reduced; anodic protection simultaneously is better, can continue to use electrolyzer restarting success ratio 100% again; the seepage phenomenon do not occur, start the back electrolyzer and operate steadily.The present technique highly versatile, easy and simple to handle, effect is remarkable, is applicable to that the 160kA-400kA large pre-baked cell stops groove.
Show through production practice, adopt this protectiveness to stop the groove technology, the rate of temperature fall that stops every day first three day behind the groove is between 110-130 ℃, and rate of temperature fall is slack-off gradually afterwards, and when stopping the groove two weeks, temperature is reduced to 50-60 ℃ in the groove, and the rate of temperature fall of every day is about 7 ℃.And find at the electrolyzer clean-up phase; the burner hearth shape of electrolyzer remains intact; anodic protection is good; can continue again to use; cathode block surfacing, few, the nothing protuberance of cracking phenomena, sidewall carbon brick does not have breakage, and the anode large bus bar of electrolyzer, lifting mechanism do not have distortion, damage phenomenon; and none leakage stops in the electrolyzer restarting process, operates steadily after the startup.
Embodiment
A kind of protectiveness of aluminium cell is stopped the groove method, may further comprise the steps: (1) extracts the part aluminium liquid in the groove earlier out, and aluminium liquid height is remained between the 10-15cm; (2) take out part electrolyte solution in the groove again, make electrolyte solution remain on 10-12cm; (3) anode is fallen in the aluminium liquid, extract whole aluminium liquid out after, the lifting anode makes electrolyte solution in the anode releasing slots, different positions inserts thermopair respectively in electrolyzer; (4) in time add the anode surface insulation material, described insulation material is an aluminum oxide, is all obturaged in feed opening, aluminium flowing-out mouth position then, builds the electrolytic bath cover plate; (5) in time close the purification smoke discharging pipe, with rock wool shutoff electrolytic bath pond sidepiece louvre, with rock wool the bottom is incubated simultaneously, to reduce the electrolyzer heat radiation; Closed workshop, trench window and style plate are closed window in the tight workshop; (6) treat that temperature is reduced to normal temperature in the electrolyzer, promptly finish and stop groove.Stop groove regular degree of tightness anode jig after 48 hours, in time discharge the stress between anode and the liner.
In addition, the insulation later stage, guaranteeing as far as possible under the unlikely prerequisite that causes cathode inner lining damage of cooling rate, take into account total stopping the groove time spent simultaneously, insulation post drop speed is crossed slowly and can suitably be adjusted, such as adjusting the groove cover plate, regulating rock wool quantity etc., prevent to stop the long influence that subsequent production is caused of groove soaking time.
Claims (4)
1. the protectiveness of an aluminium cell is stopped the groove method, it is characterized in that may further comprise the steps:
(1) extracts the interior part aluminium liquid of groove earlier out, aluminium liquid height is remained between the 10-15cm;
(2) take out part electrolyte solution in the groove again, make electrolyte solution remain on 10-12cm;
(3) anode is fallen in the aluminium liquid, extract whole aluminium liquid out after, the lifting anode makes electrolyte solution in the anode releasing slots;
(4) in time add insulation material, all obturaged in feed opening, aluminium flowing-out mouth position then, build the electrolytic bath cover plate at anode surface;
(5) in time close the purification smoke discharging pipe,, with rock wool the bottom is incubated simultaneously with rock wool shutoff electrolyzer sidepiece louvre; Closed workshop, trench window and style plate are closed window in the tight workshop;
(6) treat that temperature is reduced to normal temperature in the electrolyzer, promptly finish and stop groove.
2. the protectiveness of a kind of aluminium cell according to claim 1 is stopped the groove method, it is characterized in that stopping groove regular degree of tightness anode jig after 48 hours, in time discharges the stress between anode and the liner.
3. the protectiveness of a kind of aluminium cell according to claim 1 and 2 is stopped the groove method, it is characterized in that in above-mentioned steps, and behind the lifting anode, distributed heat galvanic couple in electrolyzer.
4. the protectiveness of a kind of aluminium cell according to claim 1 and 2 is stopped the groove method, and the insulation material that it is characterized in that described anode surface is an aluminum oxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100554897A CN101328595B (en) | 2008-07-22 | 2008-07-22 | Productive cell shutting method of aluminum cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100554897A CN101328595B (en) | 2008-07-22 | 2008-07-22 | Productive cell shutting method of aluminum cell |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101328595A CN101328595A (en) | 2008-12-24 |
| CN101328595B true CN101328595B (en) | 2010-07-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100554897A Expired - Fee Related CN101328595B (en) | 2008-07-22 | 2008-07-22 | Productive cell shutting method of aluminum cell |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104451774A (en) * | 2014-12-29 | 2015-03-25 | 云南铝业股份有限公司 | Zero allowance cell shutting polymorph high roasting 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 |
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- 2008-07-22 CN CN2008100554897A patent/CN101328595B/en not_active Expired - Fee Related
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| CN101328595A (en) | 2008-12-24 |
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