CN104451779B - Aluminum fluoride control method of aluminum electrolytic cell - Google Patents
Aluminum fluoride control method of aluminum electrolytic cell Download PDFInfo
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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
- C25C3/20—Automatic control or regulation of cells
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Abstract
The invention provides an aluminum fluoride control method of an aluminum electrolytic cell. The method comprises the following steps: determining the standard cell temperature a3, the molecular ratio standard value d3, and an upper limit value fup and a lower limit value fdown of theoretical aluminum fluoride amount f of the aluminum electrolytic cell; measuring the actual cell temperature a4, the molecular ratio d4 and the basic aluminum fluoride amount f4 of the aluminum electrolytic cell; and calculating an initial adjustment value X1, a secondary adjustment value X2, a medium adjustment value X3, a late adjustment value X4, a correction value X5 and a final adjustment value X6 of the actual aluminum fluoride amount, and obtaining the actual aluminum fluoride amount f according to the formula f=f4+X6. Compared with related technologies, the aluminum fluoride control method has the beneficial effects that the waste of an aluminum fluoride material is reduced; the production stability of the aluminum electrolytic cell is relatively good; and the current efficiency is relatively high.
Description
[technical field]
The present invention relates to technical field of aluminum electrolysis, more particularly, to a kind of aluminium cell aluminum fluoride control method.
[background technology]
It is the emphasis that electrolysis process controls, under the high temperature conditions, fluorine in electrolyte that aluminum cell electrolyte acid-base value controls
Change the volatilization of aluminium, need by technology controlling and process, the aluminum fluoride of loss to be supplemented daily.Balance between revenue and expenditure due to aluminum fluoride is subject to
The thermal balance factor impacts such as aluminium cell bath temperature, electrolyte components, aluminum oxide trapping ability, flue gas negative pressure, the change of stove side.Work
Skill controls can not accurately grasp thermally equilibrated income and expenses, even if daily be modified to balance between revenue and expenditure supplementing, electrolyte
During acid-base value is still in fluctuating, and cause aluminium cell thermally equilibrated stable, cause the loss of current efficiency.
In the control method of the aluminum fluoride in correlation technique, apply the aluminum fluoride control based on genetic algorithm and neutral net
Simulation, can be mainly according to the electrolysis temperature prediction aluminum fluoride adjustment amount of second day of first day, this model using this model
Using electrolysis temperature, liquidus temperature and tank voltage as input, using aluminum fluoride adjustment amount as output.But the control of this aluminum fluoride
Method lacks the analysis to live groove condition, in addition only relates to the adjustment to certain several Parameters variation, does not consider that aluminium cell is overall
Thermally equilibrated change, the adjustment of aluminum fluoride is mismatched with aluminium cell thermal balance demand, and bath temperature and molecular proportion control dispersion big,
Cause the waste of material, the steady production of aluminium cell is impacted simultaneously, reduce current efficiency.Thus, correlation technique
Aluminum fluoride control method have that aluminum fluoride material waste is more, aluminium cell production stability is poor, and current efficiency is relatively low.
Therefore, it is necessary in fact to provide a kind of new aluminium cell aluminum fluoride control method to overcome above-mentioned technical problem.
[content of the invention]
The technical problem to be solved in the invention is to provide a kind of aluminum fluoride material waste less, and aluminium cell produces stable
Property preferably, the higher aluminium cell aluminum fluoride control method of current efficiency.
A kind of present invention aluminium cell aluminum fluoride control method, the method comprises the following steps:
Step one, determine standard bath temperature a of described aluminium cell3, the calibrated altitude b of aluminium liquid3, the calibrated altitude of electrolyte
c3, molecular proportion standard value d3, alumina blanking amount standard value e3, theoretical aluminum fluoride material quantity f3Higher limit fOnWith lower limit fUnder；
Step 2, measure actual bath temperature a of described aluminium cell4, the height b of aluminium liquid4, the height c of electrolyte4, molecule
Compare d4, alumina blanking amount e4, basic aluminum fluoride consumption f4；
Step 3, for the first time actual aluminum fluoride consumption of adjustment, if actual aluminum fluoride consumption is f, its first adjusted value is x1,
If -3 ＜ a4-a3＜ 0, the then first adjusted value x of actual aluminum fluoride consumption f1For -4～-3；If 0 ＜ a4-a3＜ 3, then actual fluorination
The first adjusted value x of aluminium consumption f1For 3～4,
If -8≤a4-a3≤ -3, then the first adjusted value x of actual aluminum fluoride consumption f1For -6～-5；If 3≤a4-a3≤ 8,
The then first adjusted value x of actual aluminum fluoride consumption f1For 5～6,
If a4-a3＜ -8, then the first adjusted value x of actual aluminum fluoride consumption f1For -10～-8；If a4-a3＞ 8, then actual
The first adjusted value x of aluminum fluoride consumption f1For 8～10；
Step 4, again adjust actual aluminum fluoride consumption, if its again adjusted value be x2If, d4-d3≤ -0.1, then actual
The adjusted value x again of aluminum fluoride consumption f2For -10～-3, d4-d3>=0.1, then the adjusted value x again of actual aluminum fluoride consumption f2
For 3～10；
Step 5, the median of the actual aluminum fluoride consumption of adjustment, if the middle adjusted value of actual aluminum fluoride consumption is x3,
If -3 ＜ x1+x2＜ 3, the then middle adjusted value x of actual aluminum fluoride consumption f3For 0,
If -12≤x1+x2≤ -3 or 3≤x1+x2≤ 12, the then middle adjusted value x of actual aluminum fluoride consumption f3=x1+x2,
If x1+x2＞ 12 or x1+x2＜ -12, then the middle adjusted value x of actual aluminum fluoride consumption f3=12；
Step 6, measure degree of superheat k of aluminium cell,
If a4-a3≤ -3 and 8 ＜ k ＜ 12, then the later stage adjusted value x of actual aluminum fluoride consumption f4≤6；
If the bath temperature of step 7 aluminium cell is in ascendant trend, correction value x of actual aluminum fluoride consumption f5=-5,
If the bath temperature of aluminium cell is in downward trend, correction value x of actual aluminum fluoride consumption f5=5；
Step 8, the final adjustment value of the actual aluminum fluoride consumption of judgement, if the final adjustment value of actual aluminum fluoride consumption is
x6If, fUnder≤f4+x3+x4+x5≤fOn, then final adjustment value x of actual aluminum fluoride consumption f6=x3+x4+x5, and according to f=f4+x6
Obtain actual aluminum fluoride consumption f, if f4+x3+x4+x5＜ fUnderOr f4+x3+x4+x5＞ fOn, then repeat step one is to step 7, until
fUnder≤f4+x3+x4+x5≤fOn, and calculate actual aluminum fluoride consumption f.
Compared with correlation technique, the beneficial effects of the present invention is, the abnormality of aluminium cell has been carried out evading with
Process, the adjustment of aluminum fluoride meets the thermally equilibrated stable tendency of aluminium cell, and aluminum fluoride material waste is less, aluminium cell produces
Preferably, current efficiency is higher for stability.
[specific embodiment]
With reference to embodiment, the invention will be further described.
A kind of present invention aluminium cell aluminum fluoride control method, comprises the following steps:
Step one, determine standard bath temperature a of described aluminium cell3, the calibrated altitude b of aluminium liquid3, the calibrated altitude of electrolyte
c3, molecular proportion standard value d3, alumina blanking amount standard value e3, theoretical aluminum fluoride material quantity f3Higher limit fOnWith lower limit fUnder；
Step 2, measure actual bath temperature a of described aluminium cell4, the height b of aluminium liquid4, the height c of electrolyte4, molecule
Compare d4, alumina blanking amount e4, basic aluminum fluoride consumption f4；
Step 3, for the first time actual aluminum fluoride consumption of adjustment, if actual aluminum fluoride consumption is f, its first adjusted value is x1,
If -3 ＜ a4-a3＜ 0, the then first adjusted value x of actual aluminum fluoride consumption f1For -4～-3；If 0 ＜ a4-a3＜ 3, then actual fluorination
The first adjusted value x of aluminium consumption f1For 3～4,
If -8≤a4-a3≤ -3, then the first adjusted value x of actual aluminum fluoride consumption f1For -6～-5；If 3≤a4-a3≤ 8,
The then first adjusted value x of actual aluminum fluoride consumption f1For 5～6,
If a4-a3＜ -8, then the first adjusted value x of actual aluminum fluoride consumption f1For -10～-8；If a4-a3＞ 8, then actual
The first adjusted value x of aluminum fluoride consumption f1For 8～10；
Step 4, again adjust actual aluminum fluoride consumption, if its again adjusted value be x2If, d4-d3≤ -0.1, then actual
The adjusted value x again of aluminum fluoride consumption f2For -10～-3, d4-d3>=0.1, then the adjusted value x again of actual aluminum fluoride consumption f2
For 3～10；
Step 5, the median of the actual aluminum fluoride consumption of adjustment, if the middle adjusted value of actual aluminum fluoride is x3If, -3 ＜
x1+x2＜ 3, the then middle adjusted value x of actual aluminum fluoride consumption f3For 0,
If -12≤x1+x2≤ -3 or 3≤x1+x2≤ 12, the then middle adjusted value x of actual aluminum fluoride consumption f3=x1+x2,
If x1+x2＞ 12 or x1+x2＜ -12, then the middle adjusted value x of actual aluminum fluoride consumption f3=12；
Step 6, measure degree of superheat k of aluminium cell,
If a4-a3≤ -3 and 8 ＜ k ＜ 12, then the later stage adjusted value x of actual aluminum fluoride consumption f4≤6；
If the bath temperature of step 7 aluminium cell is in ascendant trend, correction value x of actual aluminum fluoride consumption f5=-5,
If the bath temperature of aluminium cell is in downward trend, correction value x of actual aluminum fluoride consumption f5=5；
Step 8, the final adjustment value of the actual aluminum fluoride consumption of judgement, if its final adjustment value is x6If, fUnder≤f4+x3+
x4+x5≤fOn, then final adjustment value x of actual aluminum fluoride consumption f6=x3+x4+x5, and according to f=f4+x6Obtain actual aluminum fluoride
Consumption f, if f4+x3+x4+x5＜ fUnderOr f4+x3+x4+x5＞ fOn, then repeat step one is to step 7, until fUnder≤f4+x3+x4+x5
≤fOn, and calculate actual aluminum fluoride consumption f.
In present embodiment, standard bath temperature a of aluminium cell3, the calibrated altitude b of aluminium liquid3, the calibrated altitude c of electrolyte3、
Molecular proportion standard value d3, alumina blanking amount standard value e3, higher limit f of theoretical aluminum fluoride consumption fOnWith lower limit fUnderBy existing
Field technologist determines, basic aluminum fluoride consumption refers to the last time of aluminium cell according to the actual production situation of aluminium cell
It should be noted that in embodiment of the present invention, the unit of temperature is DEG C aluminum fluoride consumption, the unit of height is cm, aluminum oxide
The unit of discharge quantity and aluminum fluoride consumption is all kg.
By this aluminium cell aluminum fluoride control method, the abnormality of aluminium cell is evaded and has been processed, fluorine
The adjustment changing aluminium meets the thermally equilibrated stable tendency of aluminium cell, and aluminum fluoride material waste is less, aluminium cell production stability
Preferably, current efficiency is higher.
It is described further with reference to specific embodiment.
Embodiment one:
A kind of aluminium cell aluminum fluoride control method, comprises the following steps:
Step one, 950 DEG C of standard bath temperature determining aluminium cell, the calibrated altitude 28cm of aluminium liquid, the standard height of electrolyte
Degree 16～19cm, molecular proportion standard value 2.4, alumina blanking amount standard value 4600kg, the higher limit of theoretical aluminum fluoride material quantity
38kg and lower limit 6kg；
Step 2,955 DEG C of actual bath temperature measuring aluminium cell, the height 29cm of aluminium liquid, the 19cm of electrolyte, molecule
Than 2.5, alumina blanking amount 4320kg, basic aluminum fluoride consumption 32kg；
Step 3, due to 955 DEG C -950 DEG C=5 DEG C, then the first adjusted value x of actual aluminum fluoride consumption f1=6kg；
Step 4, due to 2.5-2.4=0.1, then the adjusted value x again of actual aluminum fluoride consumption f2=6kg；
Step 5, due to x1+x2=12kg, the then middle adjusted value x of actual aluminum fluoride consumption f3=12kg；
Step 6, the bath temperature due to aluminium cell are in ascendant trend, then correction value x of actual aluminum fluoride consumption f5=-
5kg；
Step 7, due to x3+x5=6kg, and f4+x3+x5=38kg, 38kg are not higher than the upper limit of theoretical aluminum fluoride material quantity
Value 38kg is also not below lower limit 6kg of theoretical aluminum fluoride material quantity, then final adjustment value x of actual aluminum fluoride consumption f6=
6kg, according to f=f4+x6Obtain actual aluminum fluoride consumption f=38kg.
Embodiment two:
Step one, 950 DEG C of standard bath temperature determining described aluminium cell, the calibrated altitude 28cm of aluminium liquid, the mark of electrolyte
Quasi- height 16～19cm, molecular proportion standard value 2.4, alumina blanking amount standard value 4600kg, theoretical aluminum fluoride material quantity upper
Limit value 38kg and lower limit 6kg；
Step 2,940 DEG C of actual bath temperature measuring described aluminium cell, the height 29cm of aluminium liquid, the height of electrolyte
17cm, molecular proportion 2.3, alumina blanking amount 4650kg, basic aluminum fluoride consumption 15kg；
Step 3, due to 940 DEG C -950 DEG C=- 10 DEG C, then the first adjusted value x of actual aluminum fluoride consumption f1=-9kg；
Step 4, due to 2.3-2.4=-0.1, then the adjusted value x again of actual aluminum fluoride consumption f2=-3
Step 5, due to x1+x2=-12kg, the then middle adjusted value x of actual aluminum fluoride consumption f3=-12kg；
Step 6, the bath temperature due to aluminium cell are in downward trend, then correction value x of actual aluminum fluoride consumption f5=
5kg；
Step 8, due to x3+x5=-7kg, f4+x3+x5=8kg, 8kg are not higher than the higher limit of theoretical aluminum fluoride material quantity
38kg is also not below lower limit 6kg of theoretical aluminum fluoride material quantity, then final adjustment value x of actual aluminum fluoride consumption f6=-
7kg, according to f=f4+x6Obtain actual aluminum fluoride consumption f=8kg.
Embodiment three:
Step one, 950 DEG C of standard bath temperature determining aluminium cell, the calibrated altitude 28cm of aluminium liquid, the standard height of electrolyte
Degree 16～19cm, molecular proportion standard value 2.4, alumina blanking amount standard value 4600kg, the higher limit of theoretical aluminum fluoride material quantity
38kg and lower limit 6kg；
Step 2,947 DEG C of actual bath temperature measuring aluminium cell, the height 27cm of aluminium liquid, the height 18cm of electrolyte,
Molecular proportion 2.3, alumina blanking amount 4550kg, basic aluminum fluoride consumption 20kg；
Step 3, due to 947 DEG C -950 DEG C=- 3 DEG C, then the first adjusted value x of actual aluminum fluoride consumption f1=-5kg；
Step 4, due to 2.3-2.4=-0.1, then the adjusted value x again of actual aluminum fluoride consumption f2=-5kg；
Step 5, due to x1+x2=-10kg, the then middle adjusted value x of actual aluminum fluoride consumption f3=-10kg；
Step 6, measure degree of superheat k=10 DEG C of aluminium cell,
Due to 947 DEG C -950 DEG C=- 3 DEG C and k=10 DEG C, then the later stage adjusted value x of actual aluminum fluoride consumption f4=3kg；
Step 7, the bath temperature due to aluminium cell are in downward trend, then correction value x of actual aluminum fluoride consumption f5=5；
Step 8, due to x3+x4+x5=-2kg, and f4+x3+x4+x5=18kg, 18kg are not higher than theoretical aluminum fluoride materials
Higher limit 38kg of amount is also not below lower limit 6kg of theoretical aluminum fluoride material quantity, the then final adjustment of actual aluminum fluoride consumption f
Value x6=-2kg, according to f=f4+x6Obtain actual aluminum fluoride consumption f=18kg.
Compared with correlation technique, the beneficial effects of the present invention is, aluminum fluoride material waste is less, and aluminium cell produces steady
Qualitative preferable, current efficiency is higher.
Above-described is only embodiments of the present invention, it should be noted here that for those of ordinary skill in the art
For, without departing from the concept of the premise of the invention, improvement can also be made, but these belong to the protection model of the present invention
Enclose.
Claims (1)
1. a kind of aluminium cell aluminum fluoride control method is it is characterised in that the method comprises the following steps:
Step one, determine standard bath temperature a of described aluminium cell3, the calibrated altitude b of aluminium liquid3, the calibrated altitude c of electrolyte3, point
Sub- ratio standard value d3, alumina blanking amount standard value e3, theoretical aluminum fluoride material quantity f3Higher limit fOnWith lower limit fUnder；
Step 2, measure actual bath temperature a of described aluminium cell4, the height b of aluminium liquid4, the height c of electrolyte4, molecular proportion d4、
Alumina blanking amount e4, basic aluminum fluoride consumption f4；
Step 3, for the first time actual aluminum fluoride consumption of adjustment, if actual aluminum fluoride consumption is f, its first adjusted value is x1If, -3 ＜
a4-a3＜ 0, the then first adjusted value x of actual aluminum fluoride consumption f1For -4～-3；If 0 ＜ a4-a3＜ 3, then actual aluminum fluoride consumption
The first adjusted value x of f1For 3～4,
If -8≤a4-a3≤ -3, then the first adjusted value x of actual aluminum fluoride consumption f1For -6～-5；If 3≤a4-a3≤ 8, then real
The first adjusted value x of border aluminum fluoride consumption f1For 5～6,
If a4-a3＜ -8, then the first adjusted value x of actual aluminum fluoride consumption f1For -10～-8；If a4-a3＞ 8, then actual fluorination
The first adjusted value x of aluminium consumption f1For 8～10；
Step 4, again adjust actual aluminum fluoride consumption, if its again adjusted value be x2If, d4-d3≤ -0.1, then actual fluorination
The adjusted value x again of aluminium consumption f2For -10～-3, d4-d3>=0.1, then the adjusted value x again of actual aluminum fluoride consumption f2For 3～
10；
Step 5, the median of the actual aluminum fluoride consumption of adjustment, if the middle adjusted value of actual aluminum fluoride consumption is x3If, -3 ＜
x1+x2＜ 3, the then middle adjusted value x of actual aluminum fluoride consumption f3For 0,
If -12≤x1+x2≤ -3 or 3≤x1+x2≤ 12, the then middle adjusted value x of actual aluminum fluoride consumption f3=x1+x2,
If x1+x2＞ 12 or x1+x2＜ -12, then the middle adjusted value x of actual aluminum fluoride consumption f3=12；
Step 6, measure degree of superheat k of aluminium cell,
If a4-a3≤ -3 and 8 ＜ k ＜ 12, then the later stage adjusted value x of actual aluminum fluoride consumption f4≤6；
If the bath temperature of step 7 aluminium cell is in ascendant trend, correction value x of actual aluminum fluoride consumption f5=-5, if aluminium is electric
The bath temperature of solution groove is in downward trend, then correction value x of actual aluminum fluoride consumption f5=5；
Step 8, the final adjustment value of the actual aluminum fluoride consumption of judgement, if the final adjustment value of actual aluminum fluoride consumption is x6If,
fUnder≤f4+x3+x4+x5≤fOn, then final adjustment value x of actual aluminum fluoride consumption f6=x3+x4+x5, and according to f=f4+x6Obtain
Actual aluminum fluoride consumption f, if f4+x3+x4+x5＜ fUnderOr f4+x3+x4+x5＞ fOn, then repeat step one is to step 7, until fUnder≤
f4+x3+x4+x5≤fOn, and calculate actual aluminum fluoride consumption f.
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| CN109338414B (en) * | 2018-10-30 | 2020-09-29 | 中国神华能源股份有限公司 | Method for optimizing addition amount of aluminum fluoride in aluminum electrolysis process by acid method and electronic equipment |
| CN109628959B (en) * | 2019-02-01 | 2021-07-20 | 重庆旗能电铝有限公司 | Method for automatically setting aluminum fluoride based on electrolytic cell technology centralized control platform |
| CN112176364B (en) * | 2020-08-17 | 2021-07-20 | 中铝郑州有色金属研究院有限公司 | Method for controlling lithium and potassium content in aluminum electrolyte |
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