CN103397347A - Method for controlling electrolytic tank voltage deviation - Google Patents
Method for controlling electrolytic tank voltage deviation Download PDFInfo
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- CN103397347A CN103397347A CN2013102566620A CN201310256662A CN103397347A CN 103397347 A CN103397347 A CN 103397347A CN 2013102566620 A CN2013102566620 A CN 2013102566620A CN 201310256662 A CN201310256662 A CN 201310256662A CN 103397347 A CN103397347 A CN 103397347A
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Abstract
The invention relates to a method for controlling electrolytic tank voltage deviation. The method consists of: (1) controlling the molecular ratio of NaF/AlF3 in an electrolytic tank at 2.45-2.55, controlling the mass concentration of alumina at 1.5-2.5%, and controlling the mass concentration of magnesium fluoride at 1.8-2%; (2) reducing the voltage drop of each part of the electrolytic tank; (3) consolidating the tank inner profile, reducing the horizontal electric current, and decreasing the runout groove appearance probability; (4) reducing electrolyte voltage drop; and (5) reducing the effect equal share voltage. Through the measures, the method provided in the invention eliminates the electrolytic tank voltage deviation phenomenon fundamentally, and plays a positive role for efficient, low consumption, safe, steady and long cycle operation of the electrolytic tank.
Description
Technical field
The invention belongs to the aluminum electrolysis technology field, particularly a kind ofly control the method that bath voltage departs from.
Background technology
In aluminium cell was produced, the voltage deviation of electrolyzer referred to the difference between separate unit electrolyzer average working voltage and setting voltage; And to effectively control voltage deviation, key problem is exactly the difference that will control between average working voltage and setting voltage.Operating voltage should be around slightly fluctuation up and down of setting voltage.By in production practice, summed up the factor that causes voltage deviation, as shown in table 1:
Table 1 is controlled the voltage deviation prior art
Mostly these methods are to carry out from management view, have very large randomness, therefore technical solution problem fundamentally.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the object of the present invention is to provide a kind of method that bath voltage departs from of controlling, by optimizing the physico-chemical properties such as electrolytical electroconductibility, the suitable superheating temperature of coupling, alumina concentration, control the operating voltage height that wafts.
To achieve these goals, the technical solution used in the present invention is:
A kind ofly control the method that bath voltage departs from, comprise following content:
(1) control NaF/AlF in electrolyzer
3Molecular ratio be 2.45～2.55, quality of alumina concentration is controlled at 1.5～2.5%, the magnesium fluoride mass concentration is controlled at 1.8～2.0%;
(2) reduce each pressure drop of electrolyzer;
(3) consolidate type in the groove thorax, reduce horizontal current, reduce runout groove occurrence probability;
(4) reduce the ionogen pressure drop;
(5) reduce effect and share voltage equally.
Each pressure drop of described reduction electrolyzer comprises following content:
(1) by bus, wipe ash and regularly polishing measure of anode rod every anode jig in every electrolyzer and backing plate pressure drop are all reduced to 3～5mv;
(2) anode is processed in the insulation material encirclement all the time.
The pressure drop of described reduction ionogen comprises following content:
(1) by temperature control unit, remain the groove temperature constant in required scope;
(2) when carbon granule content in ionogen greater than 0.6% the time, by its salvaging, and it is constant in required scope to add sodium aluminum fluoride to remain the groove temperature.
Described minimizing effect is shared voltage equally and is comprised following content:
(1) in the feed port of described aluminium cell, bury solenoid underground, the discharge quantity with the implementing monitoring aluminium cell when the blanking state, guarantee that blanking is smooth and easy;
(2) improve effect and extinguish quality, the controlling influence time, the effect average voltage was no more than 25V in 3 minutes.
The described interior type of groove thorax of consolidating, reduce horizontal current, reduces runout groove occurrence probability and realize in the following way:
(1) the firm stove of setting up high molecule ratio is helped, and namely the molecular ratio of stove side material exceeds 0.2 than electrolytical molecular ratio in groove, and keeps suitable superheating temperature (8-12 ℃), and the stove side that forms like this is difficult for melting, and in burner hearth, type is stable.
(2) in firm burner hearth, type can prevent electrolyzer sidepiece electric leakage (electric current wastes) phenomenon, can reduce horizontal current, increases vertical current, and reduces the fluctuation of aluminum liquid horizontal direction, reduces bath voltage pin pendulum.
Compared with prior art, the present invention has fundamentally eliminated the bath voltage off-set phenomenon, for active effect has been played in electrolyzer efficient low-consume, the macrocyclic operation of safety and steady.
Embodiment
Below in conjunction with embodiment, describe embodiments of the present invention in detail.
Choose representative A groove as implementing groove, this tank furnace base pressure falls, black voltage, effect share the voltage fourth quater in 2012 situation and in January, 2013 and the data of situation in February after contrasting as shown in table 2:
The table 2 A groove fourth quater in 2012 voltage data and 1-2 month voltage data contrast table in 2013
By the production technology approach, reduce the concrete measure of electrolyzer average voltage:
This groove fourth quater in 2012 setting voltage 3.890v, average voltage 3.919v, voltage deviation large (29mv), this groove ionogen oxidation aluminum concentration higher (4.0%) by analysis, molecular ratio higher (2.77), the low superheating temperature (3.8 ℃) on the low side that causes of groove temperature, effect coefficient high (0.11 time/groove. day), furnace bottom pressure drop large (420mv) starts this groove parameter is adjusted for above analysis January in this year.
1) rationally control molecular ratio, improve electrolytic conductivity, thereby reduce the groove operating voltage, depart from
Improve molecular ratio, increase alumina concentration, reduce magnesium fluoride concentration and all can reduce voltage deviation, but because composition of electrolyte is many-sided on the impact of electrolysis production process and other economic and technical norms, and be very complicated.From producing reality, be not suitable for significantly raise molecular ratio and alumina concentration.In production practice, molecular ratio is controlled at 2.45-2.55, and alumina concentration is controlled at 1.5-2.5%, and magnesium fluoride content is controlled at 1.8-2.0% or proper.In the present embodiment, by strengthening the addition of aluminum fluoride, molecular ratio is reduced to 2.55, alumina concentration is 2.5%, and magnesium fluoride concentration is 2.0%.
2) adopt an effective measure and reduce each pressure drop of electrolyzer, thereby make the groove operating voltage near setting voltage:
(1) process for producing groove jig, backing plate contact drop: by bus, wipe the concrete measures such as ash, regularly polishing of anode rod, jig, the in time processing of backing plate contact drop, be aided with again special appraisal management, can reduce these contact drops 3～5mv, make every anode jig of every platform trough and backing plate pressure drop all be reduced to below 3～5mv, taking care of the pence, is also that very fruitful falling is departed from approach.
(2) fill up the anode heat-insulation material: accelerated on the one hand the steel pawl---intensification and the long-term good insulation of carbon bowl contact effectively reduce this place's pressure drop.On the other hand, prevent anodic oxidation, stopped the current density increase that annode area reduces to cause, eliminated the possibility that anode drop increases.
(3) keep relatively high electrolyte level, increase anode and electrolytical contact area, reduced to a certain extent anode drop.
(4) periodic measurement is processed the termination pressure drop, checks the good insulation that guarantees each position of cell body, prevents that leakage loss and electric current from wasting.
In the present embodiment, operating voltage is improved to 5mv to 3.895V; And strengthen the electrolyzer insulation, reduce thermosteresis.
3, consolidate the interior type of groove thorax preferably, reduce horizontal current, reduce the probability that the runout groove occurs:
In production reality, electrolyzer occurs that pin shakes and swings and all may cause even hundreds of millivolt of tens millivolts of electric tank working voltage deviation setting voltages, and the measure that the production aspect can be taked has:
(1) set best technical qualification combination, be equipped with high-quality normalizing operation: under the prerequisite of material balance and energy balance, with low aluminium level, low alumina concentration is key point, be aided with the operation of codes and standards, reduce the generation of furnace bottom material (precipitation and crust), prevention runout groove occurs.
(2) while changing anode, conscientiously process furnace bottom: exchange every anode and all check and process the furnace bottom in the regulation zone, improve the furnace bottom situation, the runout groove is tended to be steady, the furnace bottom pressure drop is reduced to 370mv.
(3) because of groove suiting measures to different conditions, according to the electrolyzer operation conditions, more accurate Current distribution in anode parameter is set, prevent the unreasonable electrolyzer runout that causes of Current distribution in anode.
4, reduce the ionogen pressure drop, make operating voltage more near setting voltage, reduce voltage deviation:
(1) keep suitable temperature: when temperature was low, ionogen viscosity increased, and the internal friction of fused salt ion increases, and ion motion speed slows down, and electric conductivity reduces.Rationally control technical qualification, strengthen checking the insulation situation of electrolyzer, guarantee that the groove temperature is constant in required scope.
(2) conscientiously salvage and produce the groove breeze: when in ionogen, carbon granule content is more, start to have influence on conductance, when content reaches 0.6%, can make conductance descend 10%.In production, often from aluminium flowing-out mouth, carbon granule is in time salvaged at the change poles place, and especially after effect and while changing the bight anode, emphasis is salvaged, and effect is better.After operation, from aluminium flowing-out mouth, add 1-2 spade sodium aluminum fluorides, can refrigerant ionogen, effectively reduce electrolyte voltage and fall.Also prevent to cause operating voltage to rise because carbon slag content too much causes electrolytic condenser resistance to increase.
5, after generating effect, voltage deviation is large, and all reduce effect and share the effective way that voltage is also the reduction voltage deviation equally:
(1) strengthen the maintenance and inspection of crust-breaking & baiting system, guarantee that material is smooth and easy to enter in groove.
(2) the blanking interval rationally is set, effect latent period, effect coefficient are reduced to 0.08 time/groove. day.And guarantee good material, heat balance.
(3) improve effect and extinguish quality, control on the one hand effect time (in 3 minutes) and effect average voltage (being no more than 25V is advisable) well.In addition, improve effect and extinguish technology, prevent from causing long-acting should, difficulty is gone out after effect or effect because the electrolytic resistance abnormality increases the voltage deviation that causes.
Through above technical qualification adjustment, in addition from the raising of the aspects such as management, operation, sense of responsibility and state of the art, reached the purpose that reduces voltage deviation, meet the requirement of this factory's electrolyzer efficient low-consume, safety and steady production.
Claims (5)
1. control the method that bath voltage departs from for one kind, it is characterized in that, comprise following content:
(1) control NaF/AlF in electrolyzer
3Molecular ratio be 2.45～2.55, quality of alumina concentration is controlled at 1.5～2.5%, the magnesium fluoride mass concentration is controlled at 1.8～2.0%;
(2) reduce each pressure drop of electrolyzer;
(3) consolidate type in the groove thorax, reduce horizontal current, reduce runout groove occurrence probability;
(4) reduce the ionogen pressure drop;
(5) reduce effect and share voltage equally.
2. the method that departs from of control bath voltage according to claim 1, is characterized in that, each pressure drop of described reduction electrolyzer comprises following content:
(1) by bus, wipe ash and regularly polishing measure of anode rod every anode jig in every electrolyzer and backing plate pressure drop are all reduced to 3～5mv;
(2) anode is processed in the insulation material encirclement all the time.
3. the method that departs from of control bath voltage according to claim 1, is characterized in that, the pressure drop of described reduction ionogen comprises following content:
(1) by temperature control unit, remain the groove temperature constant in required scope;
(2) when carbon granule mass concentration in ionogen greater than 0.6% the time, by its salvaging, and it is constant in required scope to add sodium aluminum fluoride to remain the groove temperature.
4. the method that departs from of control bath voltage according to claim 1, is characterized in that, described minimizing effect is shared voltage equally and comprised following content:
(1) in the feed port of described aluminium cell, bury solenoid underground, the discharge quantity with the implementing monitoring aluminium cell when the blanking state, guarantee that blanking is smooth and easy;
(2) improve effect and extinguish quality, the controlling influence time, the effect average voltage was no more than 25V in 3 minutes.
5. the method that departs from of control bath voltage according to claim 1, is characterized in that, describedly consolidates type in the groove thorax, reduces horizontal current, reduces runout groove occurrence probability and realize in the following way:
Set up the firm stove of high molecule ratio and help, namely the molecular ratio of stove side material exceeds 0.2 than electrolytical molecular ratio in groove, and keeps superheating temperature between 8-12 ℃.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105386085A (en) * | 2015-11-23 | 2016-03-09 | 林州市林丰铝电有限责任公司 | Method for stabilizing continuous production of 400 KA aluminum electrolytic cell |
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| CN103060848A (en) * | 2012-12-19 | 2013-04-24 | 中南大学 | Aluminum electrolytic tank with artificial hearth |
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2013
- 2013-06-25 CN CN2013102566620A patent/CN103397347A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1032660C (en) * | 1993-07-27 | 1996-08-28 | 云南铝厂 | Casting, roasting and starting technique for self-roasting tank of Al electrolysis |
| CN1557995A (en) * | 2004-01-18 | 2004-12-29 | 泰安泰山铝电有限公司 | Energy-saving method for preparing electrolytic aluminium by reducing bath voltage |
| CN1873057A (en) * | 2006-04-28 | 2006-12-06 | 中国铝业股份有限公司 | Preparation method of lead electrobath for transitting to electrolysis in low termperature |
| CN101260542B (en) * | 2007-11-28 | 2010-06-02 | 河南中孚实业股份有限公司 | Low polar distance energy-saving production method for aluminum electrolysis bath |
| CN101255574A (en) * | 2007-12-17 | 2008-09-03 | 中国铝业股份有限公司 | Potassium salt system electrolyte for aluminium electrolysis |
| CN103060848A (en) * | 2012-12-19 | 2013-04-24 | 中南大学 | Aluminum electrolytic tank with artificial hearth |
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| 杨国文: "《铝电解生产实践与探索：铝电解技术论文专集》", 30 September 2005, article "l60kA预焙铝电解槽上降低直流电耗的途径及实践", pages: 44-46 - 3 * |
Cited By (1)
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| CN105386085A (en) * | 2015-11-23 | 2016-03-09 | 林州市林丰铝电有限责任公司 | Method for stabilizing continuous production of 400 KA aluminum electrolytic cell |
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Application publication date: 20131120 |