CN1067456A - The roasting method of self-baked aluminum cell - Google Patents
The roasting method of self-baked aluminum cell Download PDFInfo
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- CN1067456A CN1067456A CN 91103797 CN91103797A CN1067456A CN 1067456 A CN1067456 A CN 1067456A CN 91103797 CN91103797 CN 91103797 CN 91103797 A CN91103797 A CN 91103797A CN 1067456 A CN1067456 A CN 1067456A
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Abstract
The present invention is a kind of roasting method of self-baked aluminum cell, replaces traditional coke, coke powder or molten aluminum roasting with aluminium shot (the centre hole sheet waste material of processing toothpaste aluminium sheet circle is called aluminium shot).Promptly, carbon anode is contacted with aluminum bean layer, utilize the aluminium shot conduction after the energising, and rely on the two poles of the earth resistance heating to carry out roasting at the even spreading one deck of cell bottom aluminium shot.Utilize present method to carry out the roasting of aluminium cell, can reach and shorten the roasting phase, province's energy, saving of labor, material-saving, roasting quality improve the effect in stove longevity well.
Description
The present invention relates to metallurgical technology field, specifically the roasting method of self-baked aluminum cell.
The roasting process of aluminium cell is to having a direct impact bath life, can comparatively fast change ordinary production over to electrolyzer very important effect is arranged, no matter be newly-built series electrolyzer in batch, the single electrolyzer or the electrolyzer of operation again that stops production all need just can change ordinary production over to through roasting and startup after the extensive repair.The purpose of soderberg cell roasting is: 1, casting mold anode by roasting, becomes one and can supply with the anode of producing continuous use; 2, roasting negative electrode, by roasting, charcoal is stuck with paste or is all stuck with paste the negative electrode slot liner of making firm by ramming with charcoal and carry out sintering between the cathode carbon pieces, becomes a plain groove thorax of complete charcoal; 3, oven dry bottom land liner, and further improve the groove bore temperature, make it to approach the production temperature, be beneficial to next step startup.At present, the method of roasting aluminum electrolytic bath has: 1, coke roasting, between electrolyzer the two poles of the earth, lay coke layer, resistance heating roasting the two poles of the earth after utilizing it to switch on, main drawback is that roasting time is long, prepurging labour intensity is big, labor condition is poor, need the power failure prepurging, roasting voltage height, consume electric power and material are more.2, coke sinter, this is the improvement of coke roasting, with the coke powder coke for replacing, its shortcoming is because electric current rises comparatively fast, adjusts comparatively difficulty of anodic current uniform distribution, and roasting voltage is higher, to start the interior breeze of back ionogen many in addition, need pull the expense of taking a lot of work material in a large number out.3, molten aluminum roasting, after pouring into a considerable amount of aluminium liquid between the electrolyzer two, energising immediately, prepurging need not have a power failure after this method roasting, just can directly start, and start cleaning of back ionogen, be subjected to high temperature impact irritating aluminium moment but shortcoming is the carbon cathode surface, influence charcoal and stick with paste sintering quality, cause bearth damage easily and leak aluminium liquid.4, aluminium liquid ingot bar roasting method forms the thick aluminium liquid of 4-5 centimetre at bottom land with aluminium liquid, carries out the anode casting mold after cooling on aluminium sheet, electrical roasting then, its weak point is that aluminium liquid is cooled to the piece post shrinkage, makes local furnace bottom and aluminium block dead level occur, and conduction is uneven, again because the aluminium block perk makes anode contact injustice, the contraction when forming the lead process with aluminium block, make the local drawing crack of furnace bottom carbon material, influence the stove longevity.
The object of the present invention is to provide a kind of method of self-baked aluminum cell roasting, this method can collect coke, the advantage of coke sinter, molten aluminum roasting and aluminium liquid ingot bar roasting method, overcome its deficiency, can reach the roasting phase that shortens, it is good to economize energy, saving of labor, material-saving, roasting quality, the effect in raising stove longevity.
Solution of the present invention is: use conventional aluminium cell and calcination steps thereof, the Calcium Fluoride (Fluorspan) layer is arranged during electrolysis, sodium aluminum fluoride, aluminum oxide, the yellow soda ash layer, with aluminium shot (the centre hole sheet waste material of processing toothpaste aluminium flake, granularity 5-10 millimeter, be called aluminium shot) replace traditional coke or coke powder or aluminium liquid or ingot bar at the even spreading one deck of bottom land aluminium shot, carbon annode is contacted with aluminum bean layer, utilize the aluminium shot conduction after the energising, and rely on the two poles of the earth resistance heating to carry out roasting, by adjusting little bus electric conduction quantity control anodic distribution of current, make anode form good cone, need not have a power failure blowing out and prepurging can directly start.
The roasting method of self-baked aluminum cell of the present invention has the following advantages; start back ionogen cleaning; the aluminium shot roasting turns to aluminium water; high temperature impact when aluminium water is to the perfusion of carbon cathode surface when also not having molten aluminum roasting; cause Lou aluminium water problems; maturing temperature can evenly rise, and helps protecting burner hearth, increases the big stove longevity.Can shorten the roasting phase, it is good to economize energy, saving of labor, material-saving, roasting quality, and the electrolyzer after roasting is moving is managed well, easily changes over to normally, and technico-economical comparison is good.
Fig. 1 is the synoptic diagram of self-baked aluminum cell of the present invention
Description of drawings: 1-cathode can thorax and pot shell, 2-alumina blanking case, 3-gas skirt, 4-anode, 5-anode bar, 6-sodium aluminum fluoride, aluminum oxide, yellow soda ash layer, 7-aluminium shot, 8-Calcium Fluoride (Fluorspan) layer.
Below in conjunction with embodiment method of the present invention is further described.
One, anode casting mold operation steps:
1, evenly spread one deck Calcium Fluoride (Fluorspan) in the slope all around along the groove thorax, 300 kilograms of every platform troughs apart from 100 millimeters in aluminium case, at the aluminium shot of the even spreading 7-8 cm thick of bottom land (in the Calcium Fluoride (Fluorspan) circle), make carbon annode contact with aluminum bean layer.
2, the outer good anode bodies of casting mold of groove is hung in the groove in place maybe will make have the big aluminium case in the end to hang in the anode superstructure to tie, require smooth the contact with aluminium shot well at the bottom of the case, all around with the framework applying well.
3, reinforce under the anode frame wing with aluminium sheet, and withstand with aluminium ingot.
If 4 in stove casting mold, then need beat rod eye, on 350 millimeters the big face in front and back at the bottom of the distance case, make a call to first row's rod eye, play second and third row's rod again every 200 mm distance then.
5, will changing the paste stove, to hang onto big aluminium case internal fixing good, and following filling of paste paste stove is connected power supply and can be changed the paste operation.
6, after liquid in the aluminium case is stuck with paste highly near first row's rod eye, anode bar can be filled in the rod eye, treat that liquid sticks with paste highly near behind second and third row's rod eye, anode bar can be filled in the rod eye.
7, treat to have a power failure when the liquid paste highly reaches the 800-900 millimeter in the big aluminium case, and after the cooling of waiting paste stove, hang on another platform trough and use.
Two, roasting shove charge
1, respectively builds a head piece in former and later two big centre of electrolyzer with electrolyte block or aluminium ingot and make to observe and irritate ionogen usefulness.
2, one deck is spread with the fritter ionogen in the bottom around anode and the furnace side portion.
3, on the fritter ionogen, add sodium aluminum fluoride again, every platform trough 6-7 ton, 200 kilograms in aluminum oxide 250-300 kilogram, yellow soda ash.
Three, roasting energising is guaranteed electric current between 60-61KA, relies on the two poles of the earth resistance heating to carry out roasting cone height around anode and reaches the 450-500 millimeter, and when middle part cone height reached the 500-550 millimeter, electrolyzer can start.
Four, the startup of electrolyzer
The startup method, first electrolyzer adopts dry starting, all the other all use wet start, dry starting: effect voltage is controlled at about 50V, the time was controlled at 40-50 minute, moment maximum voltage be not more than 80V, after effect is extinguished, scraping anode bottom.Wet start: promote anode gradually when irritating ionogen, bath voltage rises gradually, remains on about 10V, and the highest 13V that is no more than remains on 9-10V after startup finishes, and scraping anode bottom.Aggregate level remains on more than 400 millimeters behind the electrobath start, and suitably replenishes a part of yellow soda ash (Na
2CO
3) and M F molecular ratio remain on 2.9-3.0,960-970 ℃ of groove temperature adopts high-temperature macromolecule than setting up the roasting thorax, makes AL
2O
3Dissolving is fast, and stove nation is firm.After the startup, take the circumstances into consideration blanking, stove nation forms, and molecular ratio is dropped to below 2.8 gradually.
Claims (2)
1, a kind of roasting method of self-baked aluminum cell, use conventional aluminium cell and calcination steps thereof, it is characterized in that with aluminium shot (the centre hole sheet waste material of processing toothpaste aluminium plates, granularity is the 5-10 millimeter, be called aluminium shot) replace traditional coke or coke powder or aluminium liquid, at the even spreading one deck aluminium shot of cell bottom (in the Calcium Fluoride (Fluorspan) circle), carbon annode is contacted with aluminum bean layer, utilize the aluminium shot conduction after the energising, and rely on the two poles of the earth resistance heating to carry out roasting.
2, method according to claim 1 is characterized in that the aluminium shot of every the even spreading one deck of cell bottom 7-8 cm thick.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91103797 CN1028118C (en) | 1991-05-31 | 1991-05-31 | Roasting method for self-roasting tank for aluminium electrolysis |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91103797 CN1028118C (en) | 1991-05-31 | 1991-05-31 | Roasting method for self-roasting tank for aluminium electrolysis |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1067456A true CN1067456A (en) | 1992-12-30 |
| CN1028118C CN1028118C (en) | 1995-04-05 |
Family
ID=4906265
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91103797 Expired - Fee Related CN1028118C (en) | 1991-05-31 | 1991-05-31 | Roasting method for self-roasting tank for aluminium electrolysis |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1028118C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1085745C (en) * | 1999-09-24 | 2002-05-29 | 平果铝业公司 | Coke grain roast starting method for aluminium electrolyzer with pre-roasted anode |
| CN1308492C (en) * | 2004-05-14 | 2007-04-04 | 中国铝业股份有限公司 | Aluminum electrolytic tank calcining method |
| CN100523307C (en) * | 2006-07-06 | 2009-08-05 | 中国铝业股份有限公司 | Furnace charging method for aluminum electrolytic bath |
-
1991
- 1991-05-31 CN CN 91103797 patent/CN1028118C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1085745C (en) * | 1999-09-24 | 2002-05-29 | 平果铝业公司 | Coke grain roast starting method for aluminium electrolyzer with pre-roasted anode |
| CN1308492C (en) * | 2004-05-14 | 2007-04-04 | 中国铝业股份有限公司 | Aluminum electrolytic tank calcining method |
| CN100523307C (en) * | 2006-07-06 | 2009-08-05 | 中国铝业股份有限公司 | Furnace charging method for aluminum electrolytic bath |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1028118C (en) | 1995-04-05 |
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