CN102534685B - Refined aluminum pot roasting starting method - Google Patents
Refined aluminum pot roasting starting method Download PDFInfo
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- CN102534685B CN102534685B CN201110416237.4A CN201110416237A CN102534685B CN 102534685 B CN102534685 B CN 102534685B CN 201110416237 A CN201110416237 A CN 201110416237A CN 102534685 B CN102534685 B CN 102534685B
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Abstract
The invention relates to a refined aluminum pot roasting starting method, which is characterized by comprising a refined aluminum pot baking stage and a refined aluminum pot roasting stage. The baking stage comprises the following steps of: laying a layer of cryolite on artificial ledges on and around a refined aluminum pot anode carbon block in a refined aluminum pot, and baking the refined aluminum pot until the temperature of a hearth of the refined aluminum pot reaches 400 to 500 DEG C. The roasting stage comprises the following steps of: laying a mixture of graphite powder and graphite particles below each graphite cathode, arranging a graphite stack on the mixture, enclosing each graphite cathode and filling the hearth of the refined aluminum pot by using electrolyte powder, electrifying the refined aluminum pot, raising current to 60,000 amperes according to a pre-formulated current-time curve, and when the height of liquid electrolyte in the refined aluminum pot reaches 20cm, and the temperature of the liquid electrolyte reaches 800 DEG C, keeping voltage not to be higher than 15v, and starting the refined aluminum pot. The method has the following advantages: the whole starting process is easy to operate, safe, reliable and stable in running; the refined aluminum pot is less thermally impacted and damaged; the service life of the refined aluminum pot can be prolonged; and project implementation investment and production running cost can be reduced.
Description
Technical field:
The present invention relates to a kind of refined aluminum pot roasting starting method, belong to electrolytic aluminum refining techniques field in metallurgy.
Background technology:
At present, the existing three layers of liquid electrolytic process of China to refined aluminum groove roasting and starting technology in, generally all adopt wet start: first utilize extraneous heating unit to carry out roasting to refined aluminum groove, reach after certain temperature Deng refined aluminum groove bore temperature, in refined aluminum groove, inject a certain amount of liquid alloy, and then inject and pass into direct current after a certain amount of previously prepared good heat of liquid ionogen and carry out initiating task, utilize high temperature in refined aluminum groove start-up course to the further roasting of refined aluminum groove liner.Baking start-up method of the prior art, although there is advantage simple to operate, but must prepare in advance a certain amount of liquid electrolyte and liquid alloy, exist startup moment impact voltage very high simultaneously, thermal shocking is very large, liquid alloy enters the defect of refined aluminum groove liner because producing in brickwork or roasting process prior to ionogen, thereby causes short shortcoming of refined aluminum groove life-span.
Summary of the invention:
The object of this invention is to provide a kind of refined aluminum pot roasting starting method, present method is that refined aluminum groove new series is enabled in whole start-up course in the situation that there is no liquid electrolyte and operates steadily, little to refined aluminum groove thermal shocking, damage littlely, can extend refined aluminum groove work-ing life and enforceable novel roasting and starting technology.
Method of the present invention is as follows:
Method of the present invention comprises baking and two stages of roasting to refined aluminum groove:
The baking stage is to adopt Resistant heating device to carry out bake process to refined aluminum groove thorax, in refined aluminum groove, on refined aluminum groove anode carbon block and on artificial the stretching one's legs of surrounding, lay one deck sodium aluminum fluoride, then in refined aluminum groove thorax, install Resistant heating device, and refined aluminum groove is carried out to the slow baking of 6-10 days, first day groove bore temperature rises to 80--100 DEG C, and constant temperature keeps one day, 100-130 DEG C of temperature rise every day later constant temperature keep one day, while reaching 400--500 DEG C to refined aluminum groove bore temperature, Resistant heating device is removed from refined aluminum groove;
The roasting stage is molten electrolyte powder and to the further roasting process of refined aluminum groove liner, under the orthographicprojection of each piece graphite cathode, lay the compound of one deck Graphite Powder 99 and graphite granule, then placing graphite buttress on the compound of Graphite Powder 99 and graphite granule, and each graphite cathode is pressed on graphite buttress by own wt, the guide rod of graphite cathode is clamped on negative busbar with small box fastener, again the ionogen powder preparing by a certain percentage is in advance trapped among to graphite cathode around and fills refined aluminum groove thorax, powder surface is equal with graphite cathode surface, build heat-preserving cover plate, can switch on to refined aluminum groove, electric current rises to 60000 amperes according to the electric current-time curve pre-establishing, when liquid electrolyte level in refined aluminum groove reaches 20cm, when temperature reaches 800 DEG C, can promote negative electrode sustaining voltage not higher than 15v, start refined aluminum groove.
The laying depth of described sodium aluminum fluoride is 1-2cm;
The granularity of described graphite granule is: 1--3mm, and the blending ratio (weight) of Graphite Powder 99 and graphite granule is: 1: 3;
The laying depth of the compound of described Graphite Powder 99 and graphite granule is 1-3cm.
Described electric current-time curve is as follows:
Advantage of the present invention is: operation is simple for whole start-up course, safe and reliable, operate steadily, little to refined aluminum groove thermal shocking, damage littlely, can extend refined aluminum groove work-ing life, can reduce project construction investment and production run cost.
Embodiment:
At refined aluminum groove anode carbon block and refined aluminum groove surrounding is artificial lays the thick sodium aluminum fluoride of one deck 1-2cm on stretching one's legs, then in refined aluminum groove thorax, install Resistant heating device, refined aluminum groove is carried out to the slow baking of 6-10 days, first day groove bore temperature rises to 80--100 DEG C of left and right and constant temperature keeps one day, 100-130 DEG C of temperature rise every day later constant temperature keep one day, while making refined aluminum groove bore temperature reach 400--500 DEG C, Resistant heating device is removed from refined aluminum groove, then sodium aluminum fluoride in refined aluminum groove thorax is cleaned up, and negative busbar is dropped to apart from lower limit 50mm position, close the negative electrode lift power supply of locked groove control cabinet, under the orthographicprojection of each piece graphite cathode, lay the compound of the thick Graphite Powder 99 of 3cm and graphite granule, then on compound, place the graphite buttress of 350*350*150mm, and each graphite cathode is pressed on graphite buttress by own wt, the guide rod of graphite cathode is clamped on negative busbar with small box fastener, again the ionogen powder preparing is in advance trapped among to graphite cathode around and fills refined aluminum groove thorax, powder surface is equal with graphite cathode surface, build heat-preserving cover plate, can switch on to refined aluminum groove, 1000 amperes of current boosts in every 10 minutes in first 50 minutes, 5000 amperes of current boosts in every 20 minutes in 50-90 minute, 10000 amperes of current boosts in every 30 minutes in 90-150 minute, 10000 amperes of current boosts in every 10 minutes are afterwards to rising 60000 amperes to electric current, when liquid electrolyte level in refined aluminum groove reaches 20cm, when temperature reaches 800 DEG C, can promote negative electrode sustaining voltage not higher than 15v, start refined aluminum groove.
Several contents will noting in refined aluminum pot roasting starting method implementation process:
1, the current distributions of emphasis inspection cathode steel bar and anode rod iron temperature, cathode collector bar and anode rod iron after energising, notes abnormalities and will take in time countermeasure to process, and needs if desired to carry out current distributing or unclamps small box fastener;
2, the speed that promotes negative electrode while startup can not be too fast, avoids trigger voltage suddenly to rise;
3, negative electrode rises to the graphite of smashing under Graphite Electrodes when certain altitude ionogen is started working and piles up neatly and take out;
4, etc., when ionogen reaches 25cm in refined aluminum groove, pull the floating breeze of bath surface out, and the negative electrode that declines, make ionogen soak graphite cathode and graphite material chamber.
Claims (5)
1. a refined aluminum pot roasting starting method, is characterized in that: present method comprises baking and two stages of roasting to refined aluminum groove:
The baking stage is on refined aluminum groove anode carbon block and on artificial the stretching one's legs of surrounding, to lay one deck sodium aluminum fluoride in refined aluminum groove, then in refined aluminum groove thorax, install Resistant heating device, and refined aluminum groove is carried out to the slow baking of 6-10 days, first day groove bore temperature rises to 80--100 DEG C, and constant temperature keeps one day, 100-130 DEG C of temperature rise every day later constant temperature keep one day, while reaching 400--500 DEG C, Resistant heating device are removed from refined aluminum groove to refined aluminum groove bore temperature;
The roasting stage is the compound of laying one deck Graphite Powder 99 and graphite granule under the orthographicprojection of each piece graphite cathode, then placing graphite buttress on the compound of Graphite Powder 99 and graphite granule, and each graphite cathode is pressed on graphite buttress by own wt, the guide rod of graphite cathode is clamped on negative busbar with small box fastener, again the ionogen powder preparing by a certain percentage is in advance trapped among to graphite cathode around and fills refined aluminum groove thorax, powder surface is equal with graphite cathode surface, build heat-preserving cover plate, can switch on to refined aluminum groove, electric current rises to 60000 amperes according to the electric current-time curve pre-establishing, when liquid electrolyte level in refined aluminum groove reaches 20cm, when temperature reaches 800 DEG C, can promote negative electrode sustaining voltage not higher than 15v, start refined aluminum groove, described electric current-time curve is as follows:
2. refined aluminum pot roasting starting method according to claim 1, is characterized in that: the laying depth of described sodium aluminum fluoride is 1-2cm.
3. refined aluminum pot roasting starting method according to claim 1, is characterized in that: the granularity of described graphite granule is: 1--3mm, the blending ratio of Graphite Powder 99 and graphite granule is: 1:3.
4. refined aluminum pot roasting starting method according to claim 1, is characterized in that: the laying depth of the compound of described Graphite Powder 99 and graphite granule is 1-3cm.
5. refined aluminum pot roasting starting method according to claim 1, is characterized in that: on the compound of Graphite Powder 99 and graphite granule, the specification of placing graphite buttress is 350*350*150mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110416237.4A CN102534685B (en) | 2011-12-07 | 2011-12-07 | Refined aluminum pot roasting starting method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110416237.4A CN102534685B (en) | 2011-12-07 | 2011-12-07 | Refined aluminum pot roasting starting method |
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| CN102534685A CN102534685A (en) | 2012-07-04 |
| CN102534685B true CN102534685B (en) | 2014-10-08 |
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| CN201110416237.4A Expired - Fee Related CN102534685B (en) | 2011-12-07 | 2011-12-07 | Refined aluminum pot roasting starting method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB542738A (en) * | 1940-09-26 | 1942-01-26 | Birmingham Aluminium Castings | Improvements in and relating to the electrolytic refining of aluminium |
| CN1467308A (en) * | 2003-06-05 | 2004-01-14 | 中国铝业股份有限公司 | Electrorefining trough mixture roasting starting method |
| CN1467306A (en) * | 2003-06-05 | 2004-01-14 | 中国铝业股份有限公司 | Electrorefining trough wet-process starting method |
| CN1467307A (en) * | 2003-06-05 | 2004-01-14 | 中国铝业股份有限公司 | Electrorefining trough roasting starting method |
| CN102234819A (en) * | 2011-08-04 | 2011-11-09 | 中国铝业股份有限公司 | Preheating starting method for aluminium electrolysis cell |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007247057A (en) * | 2006-02-16 | 2007-09-27 | Sumitomo Chemical Co Ltd | Cathode graphite material for aluminum three layer electrorefining |
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2011
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB542738A (en) * | 1940-09-26 | 1942-01-26 | Birmingham Aluminium Castings | Improvements in and relating to the electrolytic refining of aluminium |
| CN1467308A (en) * | 2003-06-05 | 2004-01-14 | 中国铝业股份有限公司 | Electrorefining trough mixture roasting starting method |
| CN1467306A (en) * | 2003-06-05 | 2004-01-14 | 中国铝业股份有限公司 | Electrorefining trough wet-process starting method |
| CN1467307A (en) * | 2003-06-05 | 2004-01-14 | 中国铝业股份有限公司 | Electrorefining trough roasting starting method |
| CN102234819A (en) * | 2011-08-04 | 2011-11-09 | 中国铝业股份有限公司 | Preheating starting method for aluminium electrolysis cell |
Non-Patent Citations (8)
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| JP特开2007-247057A 2007.09.27 |
| 刘永刚等.铝电解槽大型预焙槽四种焙烧方法的比较.《铝电解槽大型预焙槽四种焙烧方法的比较》.2000,(第4期),第33页左栏第1段，34页右栏第2段. |
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