CN105624733B - A kind of outer dispensing feeding device of aluminium electrolysis cell and method - Google Patents
A kind of outer dispensing feeding device of aluminium electrolysis cell and method Download PDFInfo
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- CN105624733B CN105624733B CN201610131836.4A CN201610131836A CN105624733B CN 105624733 B CN105624733 B CN 105624733B CN 201610131836 A CN201610131836 A CN 201610131836A CN 105624733 B CN105624733 B CN 105624733B
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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
- C25C3/14—Devices for feeding or crust breaking
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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
- C25C3/22—Collecting emitted gases
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Abstract
The invention discloses dispensing feeding device and method outside a kind of aluminium electrolysis cell.Dispensing feeding device includes electrolyte material-compound tank (6), high-alumina electrolyte storage tank (15), anodic gas gas skirt (3).Methods described includes electrolysis procedure dust catching process, fluoride recovery combustion product gas carbon dioxide process in anodic gas trapping burning recovery combustion product gas waste heat recovery combustion product gas, al suboxide electrolyte extracts transport process, the pre- heat of solution of alumina raw material dispensing prepares high-alumina electrolyte process, and the storage of high-alumina electrolyte turn of tidal stream, which transports, returns to the processes such as electrolytic cell process.
Description
Technical field
The present invention relates to field of aluminum electrolysis, more particularly to a kind of outer dispensing-feeding device of aluminium electrolysis cell and method.
Background technology
Aluminium has extremely important status in national economy and national defense construction, and hydrogen is largely uniquely to be dissolved in aluminum melt
Gas, aluminium liquid solidification separate out hydrogen caused by stomata, it is loose the defects of, directly affect ingot casting performance and quality of item, hinder
The processing characteristics of product, it is air blister defect reason in annealing aluminium alloy.Al2O3It is mingled with and destroys aluminum substrate continuity, reduces base
Body intensity, deteriorate aluminium plastic deformation ability, reduce aluminium decay resistance and Resisting fractre toughness, provided for fatigue crack initiation
Core is (referring to He Yongdong, Zhang Xinming paper《Influence research of the electrolysis process to electrolytic aluminium liquid quality》).
Alumina inclusion content hydrogen content average out to typically in 1%-2%, your aluminium actual measurement electrolytic aluminium liquid in electrolytic aluminium liquid
0.34ml/100gAl, at present, directly it has been used widely, had been electrolysed using the technique of high-temperature electrolysis aluminium liquid production strand
The pollution of caused hydrogen and oxide inclusion to aluminum melt in journey, turn into influence aluminum melt metallurgical quality main contributor (referring to
He Yongdong paper《The metallurgical heredity of aluminium and Dissolved H in Liquid Al-Si Alloy and oxide inclusion》).
Aluminium electrolysis process timing supplements Al into electrolytic cell2O3Material, limited by electrolyte solvability, addition
Al2O3In the fast continuous dissolving people's electrolyte of only a fraction, have little time the Al of dissolving2O3Or be deposited on electrolyte-aluminium liquid interface,
Or bottom land is deposited to, see Fig. 1.Because feeding quantity has exceeded saturation Al2O3Concentration, Al on electrolyte-aluminium liquid interface2O3Content is remote
More than electrolyte layer, part Al2O, which enters in aluminium liquid, pollutes electrolytic aluminium liquid, and alumina feeding is to cause aluminium liquid liberation of hydrogen, increase miscellaneous weight
Want reason (He Yongdong, Zhang Xinming, Chen Mingan paper《Al in electrolytic aluminium liquid2O3The formation mechenism of field trash》).
Production 1t metallic aluminiums must about consume 1.93t aluminum oxide, sand shape Al2O3There is very strong absorption property to moisture content and HF.
Data shows, α-Al2O3Igloss value can reach 4.4%, and the crystallization water need to exclude in the range of 300~1100 DEG C.According to aluminum oxide
Condensed transportation sampling data detection：Shandong Aluminum Co., Ltd. is used by oneself aluminum oxide water content (0.2-0.3) %；South Mountain Aluminum aluminum oxide is averaged
Water content is (0.3-0.4) %；Shen Huolv electricity groups aluminum oxide water content is (0.3-0.5) %.Domestic Al2O3Supply breach
Greatly, by the Al of sea-freight import2O3Actual water content reaches (1.0-2.0) % or so, and certain Chinalco is to import Al2O3Examined
Survey, the maximum water holding capacity once detected is up to 4.8%.National standard GB/T 24487-2009 regulations, the Al used in electrolytic aluminium2O3Cut down according to the circumstance
0.8%-1.0%.National standard GB/T 4292-2007 provide that aluminum fluoride water content is no more than 7.0%.Calculate by one-level material, fluorination
Aluminium strip enters electrolytic cell moisture content：2.55Kg/tAl, it is about 1.5Kg/t Al that ice crystal, which brings electrolytic cell moisture content into,.Fluorinated alumina
It is to utilize Al2O3As adsorbent, the aluminum oxide for flue gas caused by electrolysis obtained after dry cleaning is (referring to He Yong
The paper in east《The metallurgical heredity of aluminium and Dissolved H in Liquid Al-Si Alloy and oxide inclusion》).The reaction principle of dry method fluorine removal is：
Al in 1. electrolyte of table-aluminium liquid interface and bottom land sediment2O3Number
| Test sample Article Number | 1 | 2 | 3 | 4 |
| Al2O3Time (minute) after blanking | 5 | 15 | 20 | 25 |
| Al2O3Concentration (wt%) | 3.26 | 4.81 | 4.23 | 4.57 |
| Al on interface2O3Concentration (wt%) | 10.98 | 13.76 | 17.82 | 16.34 |
Al2O3+6HF→2AlF3+3H2O----------------(1)
As shown in Table 2：Fluorinated alumina average moisture content 2.80%.Through measuring and calculating：One ton of aluminium is produced, various raw materials carry water
Part it is respectively：Al2O3For 34.4kg/tAl, AlF3For 2.55kg/tAl, ice crystal is：0.15kg/tAl.Consider Treatment Effects band
The water 0.8kg/tAl entered, the moisture content total amount that raw material bring electrolytic cell into are 37.9kg/tAl, wherein：14.23kg/tAl moisture content
Into electrolyte, 10.23kg/tAl moisture content participates in cell reaction.The moisture content of electrolytic process is participated in, CO is separated out in anode2, negative electrode
Hydrogen is separated out (referring to He Yongdong, Zhang Xinming paper《Hydrogen formation mechenism is inquired into electrolytic aluminium liquid》):
The typical fluorinated alumina Chemical bath deposition of table 2：(wt%)
It is powered：C+2H2O=4 [H]+CO2------------(2)
It is 2.046kg H2/tAl to produce 1t electrolytic aluminium liquids hydrogen-separating quantity.
In summary, charging precipitation causes aluminium liquid to pollute, and the raw materials such as aluminum oxide, fluoride salt bring the water of electrolytic cell into
Point, participate in aluminium electrolysis process and produce hydrogen, be the main source of hydrogen in electrolytic aluminium liquid.
The content of the invention
The shortcomings that present invention is directed in the prior art, there is provided a kind of outer dispensing feeding device of aluminium electrolysis cell and side are provided
Method.
The present invention adopts the following technical scheme that：
The outer dispensing feeding device of a kind of aluminium electrolysis cell, it is characterised in that the dispensing feeding device is matched somebody with somebody including electrolyte
Batch can (6), high-alumina electrolyte storage tank (15), anodic gas gas skirt (3)；The top of the anodic gas gas skirt (3)
Portion is connected to the anodic gas burner (5) being installed on the electrolyte material-compound tank (6) by anodic gas delivery pipe (4)
Air inlet；Alumina reservoir (9), carbon dioxide gas recovery apparatus are installed at the top of the electrolyte material-compound tank (6)
(10) it is electrolysed with fume afterheat and fluorine dirt retracting device (8), the upper portion side wall of the electrolyte material-compound tank (6) by al suboxide
Liquid delivery pipe (11) is connected in electrolytic cell；The high-alumina electrolyte storage tank (15) by electrolyte shunt tube (14) with
The connection of the electrolyte material-compound tank (6), and the high-alumina electrolyte storage tank (15) passes through high-alumina electrolyte
Delivery pipe (17) is connected in electrolytic cell；Dust delivery pipe (20) on the groove cover (19) of electrolytic cell accesses the electrolysis
Liquid material-compound tank (6).
According to above-mentioned dispensing feeding device, it is characterised in that the al suboxide electrolyte delivery pipe (11), al suboxide
Heat-barrier material and carbon element of graphite material, outside cladding insulation material are lined with inside electrolyte circulating pump (12)；The electrolyte
Material-compound tank (6), electrolyte shunt tube (14), high-alumina electrolyte storage tank (15) liner are carbon graphite liner.
A kind of method that dispensing charging is carried out using said apparatus, it is characterised in that methods described includes：Timing extraction aluminium
Electrolyte in electrolytic cell Jing Guo electrolysis dilution, via the al suboxide electrolyte delivery pipe (11), al suboxide electricity
Solution liquid circulating pump (12) is delivered in the electrolyte material-compound tank (6)；The alumina reservoir (9) is by alumina material according to oxidation
Aluminium dispensing requirements are delivered to fume afterheat and fluorine dirt retracting device (8), contain in the preheating of activated alumina recovered flue gas, absorption flue dust
Fluorine gas compound, fluorine-containing dust, fluorinated alumina is obtained, is added into by the fluorinated alumina of preheating in the electrolyte for treating dispensing,
By further heating-heating, fusing, dissolving, high-alumina electrolyte is obtained, high-alumina electrolyte turns through the electrolyte
Flow tube (14) is transferred in the high-alumina electrolyte storage tank (15)；Treated in the high-alumina electrolyte storage tank (15)
It is defeated via the high-alumina electrolyte delivery pipe (17), high-alumina electrolyte circulating pump (18) with high-alumina electrolyte
Send back in electrolytic cell (1), supplement the aluminum oxide in electrolytic process, fluoride salt consumes.
According to the above method, it is characterised in that the aluminum oxide dispensing be according to electrolyzer electric intensity of flow, current efficiency,
Electrolyte component technological requirement, supplying meet the alumina amount of Faraday's law requirement, and supplying meets electrolysis process, supplement electrolysis
The fluoride salt amount of process consumption, dispensing requirements are incorporated 1.92-1.94t aluminum oxide, 15kg-60kg fluorinations according to every production 1t aluminium
Salt, be incorporated the mass percent component of fluoride salt for 0.5%~30% ice crystal, 0.5%~30% sodium fluoride, 40%~
85% aluminum fluoride.
The present invention is by electrolysis procedure dust catching process, more than anodic gas trapping-burning-recovery combustion product gas
Fluoride-recovery combustion product gas carbon dioxide process in heat-recovery combustion product gas, the extraction of al suboxide electrolyte-
Transport process, alumina raw material dispensing-preheating-dissolving prepare high-alumina electrolyte process, high-alumina electrolyte turn of tidal stream-storage
Deposit-transporting-and return to the processes such as electrolytic cell process, recycled by aluminium electrolytic flue reclaiming clean, anodic gas residual heat and energy,
The operations such as the outer dispensing-charging of aluminium electrolysis cell, realize aluminium electroloysis it is pollution-free, without discharge operation.It is about recyclable often to produce 1t aluminium
The anodic gas complementary energy that 1100kg, temperature are about 910 DEG C, trap 1300kg GHG carbon dioxide；Due to aluminum oxide, fluorine
Salt dissolving has carried out sufficient preheating before dispensing-charging operation and has removed water process, and dispensing-charging operation process is carried out outside groove, disappeared
Except pollution of the electrolysis raw material such as aluminum oxide, fluoride salt to electrolytic aluminium liquid, hydrogen can be obtained and alumina inclusion content is very low
High-quality electrolytic aluminium liquid, there is very high economic value and social benefit.
Brief description of the drawings
Fig. 1 is that not molten Al is precipitated in electrolytic cell on two liquid interfaces and in aluminium liquid2O3Schematic diagram；
Fig. 2 is the structural representation of the present invention.
Embodiment
Referring to Fig. 2, the outer dispensing feeding device of aluminium electrolysis cell of the invention includes electrolyte material-compound tank 6, high-alumina electricity
Solve liquid storage tank 15, anodic gas gas skirt 3.The top of anodic gas gas skirt 3 is connected to peace by anodic gas delivery pipe 4
Air inlet loaded on the anodic gas burner 5 on electrolyte material-compound tank 6；The top of electrolyte material-compound tank 6 is provided with oxidation
Aluminium hopper 9, carbon dioxide gas recovery apparatus 10 and fume afterheat and fluorine dirt retracting device 8, the upper side of electrolyte material-compound tank 6
Wall is connected in electrolytic cell by al suboxide electrolyte delivery pipe 11；High-alumina electrolyte storage tank 15 is turned by electrolyte
Flow tube 14 and the connection of electrolyte material-compound tank 6, and high-alumina electrolyte storage tank 15 is conveyed by high-alumina electrolyte
Pipe 17 is connected in electrolytic cell；Dust delivery pipe 20 on the groove cover 19 of electrolytic cell accesses the electrolyte material-compound tank 6.
Heat-barrier material and graphitic carbon material are lined with inside al suboxide electrolyte delivery pipe 11, al suboxide electrolyte circulating pump 12
Material, outside cladding insulation material；Electrolyte material-compound tank 6, electrolyte shunt tube 14, high-alumina electrolyte 15 liners of storage tank are equal
For carbon graphite liner.High-alumina electrolyte storage tank 15 can be electric heating thermal insulation, can be fuel insulation, can also be sun
Pole gas heat insulating.
Two-stage gas collection is formed by electrolytic cell 1, stove side 2, anodic gas gas skirt 3, groove cover 19, operation dust delivery pipe 20
Cover, classification trapping is carried out to anodic gas, operation dust respectively.One is formed by electrolytic cell 1, stove side 2, anodic gas gas skirt 3
Level anodic gas gas skirt, traps caused anodic gas, the vapour of fluorine, fluorine-containing dust in aluminium electrolysis process, by groove cover 19
Two level dust gas skirt is formed, trapping anode operation, goes out aluminium operation, anode effect operation, produce during groove face housekeeping operation
Dust.The anodic gas of one-level anodic gas gas skirt trapping, anodic gas burning dress is delivered to by anodic gas delivery pipe 4
5 are put, anodic gas burner 5 is arranged on electrolyte material-compound tank 6, and anodic gas burner 5 exceedes the temperature of trapping
(composition is 30% CO+70%CO to 900 DEG C of anodic gas2) burning, caused heat is as the melt of electrolyte material-compound tank 6
Energy needed for material.Anodic gas combustion process can use industrial pure oxygen, oxygen-enriched air or air, and the oxygen concentration of use is got over
Height, combustion thermal efficiency are higher, and combustion product carbon dioxide purity is higher.Often production 1t aluminium about need by 1.93t aluminum oxide,
0.05t fluoride salts are incorporated electrolytic cell, while produce 1100kg, the anodic gas that temperature is about 910 DEG C, are obtained by burning
1300kg carbon dioxide.The operation dust of two level dust gas skirt trapping, electrolysis is delivered to via operation dust delivery pipe 20
Liquid material-compound tank 6 or flue gas waste heat recovery-fluorine dirt retracting device 8, recovery anode operation, go out aluminium operation, anode effect operation, groove
Aluminum oxide dust caused by the housekeeping operation of face.
The method of the dispensing charging of the present invention includes：Electrolysis in timing extraction aluminium cell Jing Guo electrolysis dilution
Liquid, it is delivered to via al suboxide electrolyte delivery pipe 11, al suboxide electrolyte circulating pump 12 in electrolyte material-compound tank 6；Oxygen
Change aluminium hopper 9 and alumina material is delivered to fume afterheat and fluorine dirt retracting device 8, activated alumina according to aluminum oxide dispensing requirements
Fluorine-containing vapour in recovered flue gas preheating, absorption flue dust, fluorine-containing dust, obtains fluorinated alumina, the load fluorine oxidation by preheating
Aluminium 7 is added into the electrolyte 13 for treating dispensing, by further heating-heating, fusing (fluoride salt fusing), dissolving (aluminum oxide
Dissolving is in the electrolytic solution), high-alumina electrolyte 16 is obtained, high-alumina electrolyte 16 is transferred to hyperoxia through electrolyte shunt tube 14
Change in aluminium electrolyte storage tank 15, the high-alumina electrolyte 16 obtained can be that (ice crystal is molten to aluminum oxide saturated solution
Agent, aluminum oxide are solute), can be aluminum oxide unsaturated solution, can be aluminum oxide supersaturated solution, can be aluminum oxide-
The mechanical impurity of ice crystal composition；Stand-by high-alumina electrolyte in high-alumina electrolyte storage tank 15, via hyperoxia
Change aluminium electrolyte delivery pipe 17, high-alumina electrolyte circulating pump 18 is transmitted back in electrolytic cell 1, the oxidation in supplement electrolytic process
Aluminium, fluoride salt consumption.
Aluminum oxide dispensing is to meet method according to electrolyzer electric intensity of flow, current efficiency, electrolyte component technological requirement, supplying
The alumina amount of Law requirement is drawn, supplying meets electrolysis process, the fluoride salt amount of supplement electrolytic process consumption, and dispensing requirements are pressed
1.92-1.94t aluminum oxide is incorporated according to every production 1t aluminium, 15kg-60kg fluoride salts, is incorporated the mass percent component of fluoride salt
For 0.5%~30% ice crystal, 0.5%~30% sodium fluoride, 40%~85% aluminum fluoride.
Embodiment 1：Outer dispensing-charging the processing procedure of aluminium electrolysis cell
By the gas of caused anodic gas, fluorine in electrolytic cell, hand furnace side, anodic gas gas skirt trapping aluminium electrolysis process
Compound, fluorine-containing dust, anode is trapped by groove cover, goes out caused dust in the operating process such as aluminium, anode effect, groove face arrangement.Will
Fuel of the anodic gas trapped needed for as electrolyte material-compound tank melting materialss.The operation dust of trapping is defeated via delivery pipe
Electrolyte material-compound tank is delivered to, using fluoride in activated alumina Mist heat recovering, absorption flue gas, and by final titanium dioxide
Carbon is recycled.Require, the electrolyte in timing extraction electrolytic cell Jing Guo electrolysis dilution, pass through according to aluminum electrolysis process
It is delivered to by electrolyte delivery pipe, circulating pump in electrolyte material-compound tank, it is standby as the electrolyte for treating dispensing.Alumina reservoir root
According to current strength, current efficiency, electrolyte component technological requirement, supplying meets the alumina amount of Faraday's law requirement, supplying
Meet electrolysis process, the fluoride salt amount of supplement electrolytic process consumption, 1.923t aluminum oxide, 15kg ice are incorporated according to every production 1t aluminium
Spar, 0.5kg sodium fluorides, 0.5kg calcirm-fluoride or magnesium fluoride dispensing, the fluorinated alumina 7 by preheating is added into dilution
In electrolyte, electrolyte is heated-heating, fusing, dissolving, obtain high-alumina electrolyte 16.High-alumina electrolyte via
Delivery pipe, circulating pump are transmitted back in electrolytic cell, supplement the aluminum oxide in electrolytic process, fluoride salt consumes.
Embodiment 2：Outer dispensing-charging the processing procedure of aluminium electrolysis cell
By the gas of caused anodic gas, fluorine in electrolytic cell, hand furnace side, anodic gas gas skirt trapping aluminium electrolysis process
Compound, fluorine-containing dust, anode is trapped by groove cover, goes out caused dust in the operating process such as aluminium, anode effect, groove face arrangement.Will
Fuel of the anodic gas trapped needed for as electrolyte material-compound tank melting materialss.The operation dust of trapping is defeated via delivery pipe
Electrolyte material-compound tank is delivered to, using fluoride in activated alumina Mist heat recovering, absorption flue gas, and by final titanium dioxide
Carbon is recycled.Require, the electrolyte in timing extraction electrolytic cell Jing Guo electrolysis dilution, pass through according to aluminum electrolysis process
It is delivered to by electrolyte delivery pipe, circulating pump in electrolyte material-compound tank, it is standby as the electrolyte for treating dispensing.Alumina reservoir root
According to current strength, current efficiency, electrolyte component technological requirement, supplying meets the alumina amount of Faraday's law requirement, supplying
Meet electrolysis process, the fluoride salt amount of supplement electrolytic process consumption, 1.93t aluminum oxide, 15kg ice are incorporated according to every production 1t aluminium
Spar, 15kg sodium fluorides, it will be added by the fluorinated alumina 7 of preheating in the electrolyte of dilution, electrolyte is heated-heating,
Fusing, dissolving, obtain high-alumina electrolyte.High-alumina electrolyte is transmitted back in electrolytic cell via delivery pipe, circulating pump, is mended
Aluminum oxide, fluoride salt consumption in charging solution preocess.
Embodiment 3：Outer dispensing-charging the processing procedure of aluminium electrolysis cell
By the gas of caused anodic gas, fluorine in electrolytic cell, hand furnace side, anodic gas gas skirt trapping aluminium electrolysis process
Compound, fluorine-containing dust, anode is trapped by groove cover, goes out caused dust in the operating process such as aluminium, anode effect, groove face arrangement.Will
Fuel of the anodic gas trapped needed for as electrolyte material-compound tank melting materialss.The operation dust of trapping is defeated via delivery pipe
Electrolyte material-compound tank is delivered to, using fluoride in activated alumina Mist heat recovering, absorption flue gas, and by final titanium dioxide
Carbon is recycled.Require, the electrolyte in timing extraction electrolytic cell Jing Guo electrolysis dilution, pass through according to aluminum electrolysis process
It is delivered to by electrolyte delivery pipe, circulating pump in electrolyte material-compound tank, it is standby as the electrolyte for treating dispensing.Alumina reservoir root
According to current strength, current efficiency, electrolyte component technological requirement, supplying meets the alumina amount of Faraday's law requirement, supplying
Meet electrolysis process, the fluoride salt amount of supplement electrolytic process consumption, 1.922t aluminum oxide, 0.8kg are incorporated according to every production 1t aluminium
Ice crystal, 51kg aluminum fluorides, it will be added by the fluorinated alumina 7 of preheating in the electrolyte of dilution, electrolyte is heated-liter
Temperature, fusing, dissolving, obtain high-alumina electrolyte.High-alumina electrolyte is transmitted back to electrolytic cell via delivery pipe, circulating pump
In, supplement the aluminum oxide in electrolytic process, fluoride salt consumes.
Embodiment 4：Outer dispensing-charging the processing procedure of aluminium electrolysis cell
By the gas of caused anodic gas, fluorine in electrolytic cell, hand furnace side, anodic gas gas skirt trapping aluminium electrolysis process
Compound, fluorine-containing dust, anode is trapped by groove cover, goes out caused dust in the operating process such as aluminium, anode effect, groove face arrangement.Will
Fuel of the anodic gas trapped needed for as electrolyte material-compound tank melting materialss.The operation dust of trapping is defeated via delivery pipe
Electrolyte material-compound tank is delivered to, using fluoride in activated alumina Mist heat recovering, absorption flue gas, and by final titanium dioxide
Carbon is recycled.Require, the electrolyte in timing extraction electrolytic cell Jing Guo electrolysis dilution, pass through according to aluminum electrolysis process
It is delivered to by electrolyte delivery pipe, circulating pump in electrolyte material-compound tank, it is standby as the electrolyte for treating dispensing.Alumina reservoir root
According to current strength, current efficiency, electrolyte component technological requirement, supplying meets the alumina amount of Faraday's law requirement, supplying
Meet electrolysis process, the fluoride salt amount of supplement electrolytic process consumption, 1.932t aluminum oxide, 18kg ice are incorporated according to every production 1t aluminium
Spar, 42kg aluminum fluorides, it will be added by the fluorinated alumina 7 of preheating in the electrolyte of dilution, electrolyte is heated-heating,
Fusing, dissolving, obtain high-alumina electrolyte.High-alumina electrolyte is transmitted back in electrolytic cell via delivery pipe, circulating pump, is mended
Aluminum oxide, fluoride salt consumption in charging solution preocess.
Embodiment 5：Outer dispensing-charging the processing procedure of aluminium electrolysis cell
By the gas of caused anodic gas, fluorine in electrolytic cell, hand furnace side, anodic gas gas skirt trapping aluminium electrolysis process
Compound, fluorine-containing dust, anode is trapped by groove cover, goes out caused dust in the operating process such as aluminium, anode effect, groove face arrangement.Will
Fuel of the anodic gas trapped needed for as electrolyte material-compound tank melting materialss.The operation dust of trapping is defeated via delivery pipe
Electrolyte material-compound tank is delivered to, using fluoride in activated alumina Mist heat recovering, absorption flue gas, and by final titanium dioxide
Carbon is recycled.Require, the electrolyte in timing extraction electrolytic cell Jing Guo electrolysis dilution, pass through according to aluminum electrolysis process
It is delivered to by electrolyte delivery pipe, circulating pump in electrolyte material-compound tank, it is standby as the electrolyte for treating dispensing.Alumina reservoir root
According to current strength, current efficiency, electrolyte component technological requirement, supplying meets the alumina amount of Faraday's law requirement, supplying
Meet electrolysis process, the fluoride salt amount of supplement electrolytic process consumption, 1.932t aluminum oxide, 5kg ice are incorporated according to every production 1t aluminium
Spar, 25kg aluminum fluorides, it will be added by the fluorinated alumina 7 of preheating in the electrolyte of dilution, electrolyte is heated-heating,
Fusing, dissolving, obtain high-alumina electrolyte.High-alumina electrolyte is transmitted back in electrolytic cell via delivery pipe, circulating pump, is mended
Aluminum oxide, fluoride salt consumption in charging solution preocess.
Claims (4)
1. the outer dispensing feeding device of a kind of aluminium electrolysis cell, it is characterised in that the dispensing feeding device includes electrolyte dispensing
Tank（6）, high-alumina electrolyte storage tank（15）, anodic gas gas skirt（3）；The anodic gas gas skirt（3）Top
Pass through anodic gas delivery pipe（4）It is connected to and is installed on the electrolyte material-compound tank（6）On anodic gas burner（5）'s
Air inlet；The electrolyte material-compound tank（6）Top alumina reservoir is installed（9）, carbon dioxide gas recovery apparatus（10）
With fume afterheat and fluorine dirt retracting device（8）, the electrolyte material-compound tank（6）Upper portion side wall it is defeated by al suboxide electrolyte
Send pipe（11）And installed in the al suboxide electrolyte delivery pipe（11）On al suboxide electrolyte circulating pump（12）Even
It is connected in electrolytic cell；The high-alumina electrolyte storage tank（15）Pass through electrolyte shunt tube（14）With the electrolyte dispensing
Tank（6）Connection, and the high-alumina electrolyte storage tank（15）Pass through high-alumina electrolyte delivery pipe（17）Connection
Into electrolytic cell；Installed in the groove cover of electrolytic cell（19）On dust delivery pipe（20）Access the electrolyte material-compound tank（6）.
2. dispensing feeding device according to claim 1, it is characterised in that the al suboxide electrolyte delivery pipe
（11）, al suboxide electrolyte circulating pump（12）Inside is lined with heat-barrier material and carbon element of graphite material, outside cladding thermal insulating material
Material；The electrolyte material-compound tank（6）, electrolyte shunt tube（14）, high-alumina electrolyte storage tank（15）Liner is carbon
Graphite liner.
3. a kind of method that device using such as claim 1 or 2 carries out dispensing charging, it is characterised in that methods described includes：
Electrolyte in timing extraction aluminium cell Jing Guo electrolysis dilution, via the al suboxide electrolyte delivery pipe（11）、
Al suboxide electrolyte circulating pump（12）It is delivered to the electrolyte material-compound tank（6）In；The alumina reservoir（9）By aluminum oxide
Material is delivered to fume afterheat and fluorine dirt retracting device according to aluminum oxide dispensing requirements（8）, the preheating of activated alumina recovered flue gas, inhale
Fluorine-containing vapour in attached flue dust, fluorine-containing dust, fluorinated alumina is obtained, the fluorinated alumina by preheating, which is added into, treats dispensing
In electrolyte, by further heating-heating, fusing, dissolving, high-alumina electrolyte is obtained, high-alumina electrolyte is through institute
State electrolyte shunt tube（14）It is transferred to the high-alumina electrolyte storage tank（15）In；The high-alumina electrolyte storage tank
（15）In stand-by high-alumina electrolyte, via the high-alumina electrolyte delivery pipe（17）, high-alumina electrolyte follows
Ring pump（18）It is transmitted back to electrolytic cell（1）In, supplement the aluminum oxide in electrolytic process, fluoride salt consumes.
4. according to the method for claim 3, it is characterised in that the aluminum oxide dispensing be according to electrolyzer electric intensity of flow,
Current efficiency, electrolyte component technological requirement, supplying meet the alumina amount of Faraday's law requirement, and supplying meets electrolysis work
Skill, the fluoride salt amount of supplement electrolytic process consumption, dispensing requirements are incorporated 1.92-1.94t aluminum oxide according to every production 1t aluminium,
15kg-60kg fluoride salts, the mass percent component for being incorporated fluoride salt is 0.5%~30% ice crystal, 0.5%~30% fluorination
Sodium, 40%~85% aluminum fluoride.
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| CN110042430B (en) * | 2019-05-10 | 2020-07-31 | 中南大学 | Alumina blanking system and blanking method thereof |
| CN112210792A (en) * | 2020-09-18 | 2021-01-12 | 苏州泰凯闻机电科技有限公司 | Circulating aluminum product recycling electrolytic tank |
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