CN104451774A - Zero allowance cell shutting polymorph high roasting method - Google Patents
Zero allowance cell shutting polymorph high roasting method Download PDFInfo
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- CN104451774A CN104451774A CN201410827916.4A CN201410827916A CN104451774A CN 104451774 A CN104451774 A CN 104451774A CN 201410827916 A CN201410827916 A CN 201410827916A CN 104451774 A CN104451774 A CN 104451774A
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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 a zero allowance cell shutting polymorph high roasting method; the method comprises the following steps: for a freely started and stopped electrolytic cell which is required to be started, cleaning materials inside the cell and then finding the lowest point and the highest point, using the highest point as a horizontal benchmark point, using coke powders containing graphite as a roasting medium for roasting the freely started and stopped cell after zero allowance cell shutting. Comparing with the existing aluminum electrolysis technology, the zero allowance cell shutting polymorph high roasting method is able to achieve roasting of the freely started and stopped cell after multiple repeated cell shutting. The zero allowance cell shutting polymorph high roasting method is able to repair cracks and damaged portions; the safety of implementing the start is higher; the labor intensity of workers is reduced; the environment pollution caused by cathode carbon block during overhauling is reduced; and the massive pollution gas emission caused during the starting period is reduced.
Description
Technical field
The present invention relates to a kind of zero surplus and stop the different high roasting method of groove homogeneity, belong to technical field of aluminum electrolysis.
Background technology
Adapt to free stop and start formula electrolyzer that rich withered elasticity powers and traditional electrolyte groove unlike: adapt to the free stop and start formula electrolyzer that rich withered elasticity powers in life cycle, experience repeatedly stop and start.Zero surplus is stopped groove and is referred to and all to be taken away by aluminium liquid in groove when low water season stops groove, increases aluminum oxide mulch simultaneously and strengthens insulation to reduce speed of cooling.
Start for N time before groove due to through bakes to burn the article start-up course, negative electrode, stretch one's legs through high-temperature roasting, form closely knit charcoal element tank hearth profile, various inner lining material is under the impact of powerful thermal stresses and chemical stress, and the heat of inner lining material self rises, shrinkage degree discharges.Therefore the main task of N roasting is that the temperature increase of negative electrode and furnace bottom is run to normal electrolyzer the level adapted, and produces abundant ionogen, meets entry condition.
The roasting and starting of N roasting and starting and newly-built groove or overhaul groove makes a big difference, and is mainly manifested in three aspects: 1. anode bottom is not the basic reason starting groove roasting and starting difficulty N time in same level.The anode bottom of new groove can adjust with levelling when hanging anode on bus, and the electric current passed through between each anode when this just makes calcination is substantially suitable; During startup, all anodes can leave aluminium liquid simultaneously, occur that current concentration is very little in the possibility of one group of anode, start also just more smooth.And starting groove for N time, above-mentioned inborn condition does not all possess.2. starting groove temperature when groove starts for N time lower than new groove is the Another reason of roasting and starting difficulty.Because anode bottom is not in same level, the trough being in calcined state can not improve the temperature of aluminium liquid and anode and whole cell body by putting forward high-tension method.When give in groove pour into ionogen time, ionogen can very fast condensation, makes startup become difficulty; 3. as a rule, the negative electrode starting groove for N time has been roasting, and it is higher to overcome surge voltage in roasting process; Roasting time is shorter; Side wall carbon block, manually stretch one's legs and cathode bottom block in roasting process heat-up rate difference larger.
Therefore be necessary to research and develop a kind of free stop and start formula calcination method adapting to rich withered elasticity and power.
Summary of the invention
The roasting after groove is stopped for realizing free style stop and start groove zero surplus, the invention provides zero surplus and stop the different high roasting method of groove homogeneity, the method is the free stop and start formula electrolyzer to needing to start, lower-most point and vertex is found after material in cleaning groove, using vertex as horizontal reference point, adopt the coke powder containing graphite to stop the free style stop and start groove after groove as roasting medium to zero surplus and carry out roasting.
The present invention is realized by following technical proposal: a kind of zero surplus stops the different high roasting method of groove homogeneity, through following each step:
The first step, cleaning groove thorax, checks groove thorax situation and repairs negative electrode;
Second step, finds groove thorax vertex as horizontal reference point, lays roasting medium layer;
3rd step, installs anode, and guarantees to be combined closely with roasting medium layer bottom anode, then install splitter, and finally logical total current carries out roasting.
Cleaning groove thorax in the described the first step is all loosening materials in cleaning groove thorax.
Reparation negative electrode in the described the first step is repair crack and the negative electrode changing local damage.
Roasting medium layer in described second step is the coke powder containing 20wt% graphite.
Laying in described second step finds lower-most point and vertex bottom groove thorax, using vertex as horizontal reference point, finally makes the 2 ~ 4cm of roasting medium layer laying to reference point.The part of more than the rear solid electrolyte of electrolyzer material cleaning is referred to bottom its middle slot thorax.
The fractional flow of the splitter in described 3rd step controls 30 ~ 50%.I.e. calcination energising circuital 30 ~ 50%, for 300kA aluminium cell, fractional flow controls between 90 ~ 150kA.
The present invention has following advantages and beneficial effect:
(1) compare with traditional aluminum electrolyzation technology, the present invention can realize that free style stop and start groove is repeated multiple times stops the roasting after groove.
It is according to free stop and start formula electrolyzer burner hearth situation that (2) zero surpluses stop the different high roasting method technical characteristic of groove homogeneity, roasting medium of the same race is adopted to lay roasting medium, owing to being uneven bottom electrolytic bath thorax, selected reference point is the highest bottom electrolytic bath thorax, elsewhere is lower than this reference point, first fill out the same with reference point high with roasting medium, the roasting medium layer of 2 ~ 4cm is re-layed again on this basis according to the different integral of grooved, the roasting medium of different thickness is laid thus at different positions, guarantee bottom anode in the same plane, obtain good roasting effect.The present invention not only may be used for the free stop and start formula calcination that the rich withered elasticity of adaptation is powered, and also can be widely used in traditional aluminium cell re-baking.
(3) because solid electrolyte fusing in electrolyzer during roasting forms liquid electrolyte, liquid electrolyte flow into crackle and damaged part forms solid after overcooling, therefore zero surplus stop the different high roasting method of groove homogeneity can repair crack and damaged part, the security implementing to start is higher.
(4) zero surpluses stop the different high roasting method of groove homogeneity mainly to the free stop and start formula electrolyzer needing to start, and carry out roasting and starting after only need clearing up the material loosened in electrolyzer.Compared with prior art, the method does not need when starting electrolyzer to clear up the solid electrolyte forming monoblock in groove, thus reduce the labour intensity of workman, for 300kA electrolyzer, in an overhaul electrolyzer cleaning groove, material needs the 15 people workload of 2 ~ 3 days; Simultaneously electrolyzer inner cathode charcoal block continues to use, and overhaul electrolytic bath inner cathode charcoal block needs to clean out and needs again to process as waste materials or buried to environment afterwards; Use when roasting and starting burnt grain to reduce the burnt grain of about 0.5t than prior art roasting and starting electrolyzer with the method, and the method roasting and starting electrolyzer can reduce CO2 and discharge about 1.8t.Therefore the present invention can reduce the labour intensity of workman, and during minimizing overhaul, cathode carbon pieces pollution on the environment, reduces the discharge of a large amount of dusty gass produced between the starting period.
Accompanying drawing explanation
Fig. 1 is the transverse cross-sectional view of free stop and start formula aluminium cell of the present invention.
In figure, 1-feed opening, 2-gas skirt, 3-mulch, 4-cathode steel bar, 5-relative flexibility pot shell, 6-aluminium liquid, 7-is detachable manually to stretch one's legs, 8-exhanst gas outlet, 9-carbon anode, 10-ionogen, 11-negative electrode, 12-thermal insulation layer.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described.
Embodiment 1
The first step, all loosening materials in cleaning groove thorax, check groove thorax situation and the negative electrode of repair crack and replacing local damage;
Second step, finds groove thorax vertex as horizontal reference point, finds lower-most point and vertex bottom groove thorax, using vertex as horizontal reference point, finally makes the 2cm of roasting medium layer laying to reference point; Described roasting medium layer is the coke powder containing 20wt% graphite;
3rd step, install anode, and guarantee to be combined closely with roasting medium layer bottom anode, then install splitter, fractional flow controls 30%, and finally logical total current carries out roasting.
Embodiment 2
The first step, all loosening materials in cleaning groove thorax, check groove thorax situation and the negative electrode of repair crack and replacing local damage;
Second step, finds groove thorax vertex as horizontal reference point, finds lower-most point and vertex bottom groove thorax, using vertex as horizontal reference point, finally makes the 3cm of roasting medium layer laying to reference point; Described roasting medium layer is the coke powder containing 20wt% graphite;
3rd step, install anode, and guarantee to be combined closely with roasting medium layer bottom anode, then install splitter, fractional flow controls 40%, and finally logical total current carries out roasting.
Embodiment 3
The first step, all loosening materials in cleaning groove thorax, check groove thorax situation and the negative electrode of repair crack and replacing local damage;
Second step, finds groove thorax vertex as horizontal reference point, finds lower-most point and vertex bottom groove thorax, using vertex as horizontal reference point, finally makes the 4cm of roasting medium layer laying to reference point; Described roasting medium layer is the coke powder containing 20wt% graphite;
3rd step, install anode, and guarantee to be combined closely with roasting medium layer bottom anode, then install splitter, fractional flow controls 50%, and finally logical total current carries out roasting.
Claims (6)
1. zero surplus stops the different high roasting method of groove homogeneity, it is characterized in that through following each step:
The first step, cleaning groove thorax, checks groove thorax situation and repairs negative electrode;
Second step, finds groove thorax vertex as horizontal reference point, lays roasting medium layer;
3rd step, installs anode, and guarantees to be combined closely with roasting medium layer bottom anode, then install splitter, and finally logical total current carries out roasting.
2. zero surplus according to claim 1 stops the different high roasting method of groove homogeneity, it is characterized in that: the cleaning groove thorax in the described the first step is all loosening materials in cleaning groove thorax.
3. zero surplus according to claim 1 stops the different high roasting method of groove homogeneity, it is characterized in that: the reparation negative electrode in the described the first step is repair crack and the negative electrode changing local damage.
4. zero surplus according to claim 1 stops the different high roasting method of groove homogeneity, it is characterized in that: the roasting medium layer in described second step is the coke powder containing 20wt% graphite.
5. zero surplus according to claim 1 stops the different high roasting method of groove homogeneity, it is characterized in that: the laying in described second step finds lower-most point and vertex bottom groove thorax, using vertex as horizontal reference point, finally make the 2 ~ 4cm of roasting medium layer laying to reference point.
6. zero surplus according to claim 1 stops the different high roasting method of groove homogeneity, it is characterized in that: the fractional flow of the splitter in described 3rd step controls 30 ~ 50%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410827916.4A CN104451774A (en) | 2014-12-29 | 2014-12-29 | Zero allowance cell shutting polymorph high roasting method |
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| CN201410827916.4A CN104451774A (en) | 2014-12-29 | 2014-12-29 | Zero allowance cell shutting polymorph high roasting method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104694959B (en) * | 2015-04-03 | 2017-09-19 | 云南铝业股份有限公司 | A kind of free stop and start formula aluminium cell for being suitable for elasticity power supply |
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| CN102995058A (en) * | 2012-12-06 | 2013-03-27 | 云南云铝涌鑫铝业有限公司 | Method for paving roasting medium in aluminum electrolysis cell and method for roasting lining |
| CN203270053U (en) * | 2013-04-27 | 2013-11-06 | 郑州轻冶科技有限公司 | Melting pool for aluminium electrolysis cell |
| CN103510114A (en) * | 2013-09-10 | 2014-01-15 | 河南中孚实业股份有限公司 | Special-shaped cathode electrolytic tank coke-paving method |
| CN104514010A (en) * | 2013-09-30 | 2015-04-15 | 林州市林丰铝电有限责任公司 | Minor overhaul method of large-scale electrolytic tanks' local extension legs for second start-up |
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2014
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104694959B (en) * | 2015-04-03 | 2017-09-19 | 云南铝业股份有限公司 | A kind of free stop and start formula aluminium cell for being suitable for elasticity power supply |
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Application publication date: 20150325 |
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