CN115318193A - Aluminum fluoride and aluminum oxide mixing device for aluminum electrolysis cell and implementation method thereof - Google Patents
Aluminum fluoride and aluminum oxide mixing device for aluminum electrolysis cell and implementation method thereof Download PDFInfo
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- CN115318193A CN115318193A CN202210962564.8A CN202210962564A CN115318193A CN 115318193 A CN115318193 A CN 115318193A CN 202210962564 A CN202210962564 A CN 202210962564A CN 115318193 A CN115318193 A CN 115318193A
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- KLZUFWVZNOTSEM-UHFFFAOYSA-K Aluminum fluoride Inorganic materials F[Al](F)F KLZUFWVZNOTSEM-UHFFFAOYSA-K 0.000 title claims abstract description 278
- IRPGOXJVTQTAAN-UHFFFAOYSA-N 2,2,3,3,3-pentafluoropropanal Chemical compound FC(F)(F)C(F)(F)C=O IRPGOXJVTQTAAN-UHFFFAOYSA-N 0.000 title claims abstract description 187
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 title claims abstract description 62
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 38
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000002156 mixing Methods 0.000 title claims abstract description 29
- 238000005868 electrolysis reaction Methods 0.000 title claims abstract description 22
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 81
- 238000003756 stirring Methods 0.000 claims abstract description 73
- 238000007599 discharging Methods 0.000 claims abstract description 33
- 238000005303 weighing Methods 0.000 claims abstract description 32
- 239000000463 material Substances 0.000 claims abstract description 29
- 238000001514 detection method Methods 0.000 claims abstract description 27
- 238000003860 storage Methods 0.000 claims abstract description 25
- 230000007246 mechanism Effects 0.000 claims abstract description 15
- 230000005540 biological transmission Effects 0.000 claims description 11
- 238000012544 monitoring process Methods 0.000 claims description 10
- 230000003203 everyday effect Effects 0.000 claims description 7
- 239000000843 powder Substances 0.000 claims description 5
- 230000001360 synchronised effect Effects 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 description 9
- 239000003792 electrolyte Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 239000006052 feed supplement Substances 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical compound [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/80—Forming a predetermined ratio of the substances to be mixed
- B01F35/82—Forming a predetermined ratio of the substances to be mixed by adding a material to be mixed to a mixture in response to a detected feature, e.g. density, radioactivity, consumed power or colour
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/20—Measuring; Control or regulation
- B01F35/21—Measuring
- B01F35/211—Measuring of the operational parameters
- B01F35/2111—Flow rate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/20—Measuring; Control or regulation
- B01F35/21—Measuring
- B01F35/211—Measuring of the operational parameters
- B01F35/2117—Weight
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/20—Measuring; Control or regulation
- B01F35/22—Control or regulation
- B01F35/2201—Control or regulation characterised by the type of control technique used
-
- 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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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
- Electrolytic Production Of Metals (AREA)
Abstract
The invention discloses an aluminum fluoride and aluminum oxide mixing device for an aluminum electrolytic cell, which is characterized by comprising a material storage bin (6), a spiral conveying pipeline (5), an aluminum fluoride discharging bin (1), a bin discharging and stirring mechanism (2), a spiral conveying motor (4), a weighing sensor (3), a cut-off valve (10) and a flow detection device (8). The invention also discloses an implementation method of the aluminum fluoride and aluminum oxide mixing device for the aluminum electrolytic cell, which comprises the following steps: s1: and setting the total adding amount of aluminum fluoride of each aluminum electrolysis cell per day according to the total adding amount of aluminum oxide of each aluminum electrolysis cell per day, and obtaining the single adding amount of aluminum fluoride according to the adding times of aluminum oxide. According to the invention, the flow detection device is used for detecting the alumina flowing condition in the alumina conveying pipe, so that the PLC can accurately and automatically control the blanking of the aluminum fluoride, the aluminum fluoride and the alumina can be synchronously added into the electrolytic cell after being uniformly mixed, and the continuous, uniform and quantitative addition of the aluminum fluoride is realized.
Description
Technical Field
The invention belongs to the technical field of electrolytic aluminum production, and particularly relates to an aluminum fluoride and aluminum oxide mixing device for an aluminum electrolytic cell and an implementation method thereof.
Background
In the current domestic electrolytic aluminum production process, aluminum fluoride is used as an additive, and the blanking of the aluminum fluoride is generally carried out by independently operating aluminum fluoride blanking equipment and a timing blanking mode with a fixed blanking period. However, this kind of aluminium fluoride unloading equipment of independent operation, carry out 1 aluminium fluoride unloading after arriving the interval time in operation at every turn, can cause present time point aluminium fluoride unloading relatively more, along with time variation, the more close next unloading time point then aluminium fluoride content is less relatively, make aluminium fluoride content fluctuation increase in the electrolysis trough production process, electrolyte molecular ratio is unstable, be unfavorable for stable production, reduce the power consumption, and aluminium fluoride unloading equipment aluminium fluoride storehouse needs the manual work to add aluminium fluoride, because the electrolysis trough is many, intensity of labour is very big.
Therefore, the existing aluminum fluoride blanking equipment cannot realize synchronous blanking of aluminum fluoride and aluminum oxide, so that fluctuation of aluminum fluoride content is increased in the production process of an electrolytic cell, the molecular ratio of electrolyte is unstable, and the stability of electrolytic aluminum production is adversely affected. Therefore, it is necessary to develop an aluminum fluoride and alumina mixing device and an implementation method thereof, wherein aluminum fluoride can be continuously, uniformly and quantitatively added to alumina in proportion according to the aluminum fluoride consumption and the alumina delivery flow rate of the alumina, and the aluminum fluoride and alumina mixing device and the implementation method thereof are capable of achieving continuous, uniform and quantitative addition of aluminum fluoride after being uniformly mixed with alumina and then being synchronously added to an electrolytic cell together with alumina blanking.
Disclosure of Invention
The invention aims to overcome the problems of the existing aluminum fluoride blanking equipment and provide an aluminum fluoride and alumina mixing device for an aluminum electrolysis cell, which can continuously, uniformly and quantitatively add aluminum fluoride into aluminum oxide in proportion according to the aluminum fluoride consumption and the aluminum oxide conveying flow of the aluminum oxide, and synchronously blank and add the aluminum fluoride and the aluminum oxide into the electrolysis cell after the aluminum fluoride and the aluminum oxide are uniformly mixed, so that the aluminum fluoride and the aluminum oxide are continuously, uniformly and quantitatively added and mixed.
The purpose of the invention is realized by the following technical scheme:
an aluminum fluoride and aluminum oxide mixing device for an aluminum electrolytic cell comprises a material storage bin, a PLC (programmable logic controller) connected with the material storage bin, an aluminum fluoride discharging bin, a bin discharging stirring mechanism arranged in the aluminum fluoride discharging bin, a spiral conveyor communicated with a discharging opening of the aluminum fluoride discharging bin, a plurality of weighing sensors uniformly distributed on a bracket of the aluminum fluoride discharging bin and positioned on the same horizontal plane, and a flow detection device connected with the PLC and used for detecting flow information of aluminum oxide; the blanking stirring mechanism, the screw conveyor and the weighing sensor are respectively connected with the PLC; the material storage bin is connected with the feed end of the aluminum fluoride discharging bin through the feed conveying pipe, and the feed conveying pipe is connected with the feed end of the aluminum fluoride discharging bin through a stop valve and a connecting hose.
As a preferred scheme of the invention, the aluminum fluoride discharging bin consists of a round bin and a conical bin communicated with the round bin; a charging barrel is arranged at the conical head of the conical bin; the feeding end of the spiral conveyor is connected with the discharging barrel of the conical bin through a flange; the discharge end of the material storage bin is connected with the round bin through a connecting pipe and a connecting hose.
As a preferred scheme of the invention, the blanking and stirring mechanism of the storage bin comprises a stirring motor, a stirring shaft, a first stirring sheet, a second stirring sheet and a stirring transmission head; the stirring motor is vertically fixed in the center of the top cover of the aluminum fluoride discharging bin, a transmission shaft of the stirring motor extends into the aluminum fluoride discharging bin, and the stirring shaft is positioned in the aluminum fluoride discharging bin and is fixedly connected with the transmission shaft of the stirring motor; the first stirring piece and the second stirring piece are respectively and horizontally fixed on the stirring shaft, and the second stirring piece is positioned below the first stirring piece; the stirring transmission head is fixed at the lower end of the stirring shaft and is positioned in a discharge cavity of the conical bin, and the PLC is connected with the stirring motor.
As a preferable aspect of the present invention, a length ratio of the first stirring piece to the second stirring piece is 2:1, the first stirring sheet is positioned in the circular bin, and the second stirring sheet is positioned in the conical bin.
As a preferable aspect of the present invention, the load cell is a column-type load cell.
In addition, the flow detection device is a microwave solid powder flow detection device.
An implementation method of an aluminum fluoride and aluminum oxide mixing device for an aluminum electrolytic cell comprises an aluminum fluoride blanking control method and an aluminum fluoride feeding control method, wherein the aluminum fluoride blanking control method comprises the following steps:
s1: setting the total adding amount of aluminum fluoride of each aluminum electrolysis cell per day according to the total adding amount of aluminum oxide of each aluminum electrolysis cell per day, and obtaining the single adding amount of aluminum fluoride according to the adding times of aluminum oxide;
s2: calculating the addition flow rate of aluminum fluoride according to the single addition amount of aluminum fluoride and the single addition duration of aluminum oxide obtained in the step S1, and obtaining the single addition flow rate of aluminum fluoride, the single addition amount of aluminum fluoride and the single addition duration of aluminum oxide, wherein the single addition duration of aluminum oxide is equal to the single addition duration of aluminum fluoride;
s3: monitoring the alumina flowing condition in the alumina conveying pipe through a flow detection device, transmitting monitoring information to a PLC (programmable logic controller) through the flow detection device, and judging whether alumina flows in the alumina conveying pipe or not by the PLC according to the received information; if yes, the PLC controls the spiral conveyor and the stirring motor to start in sequence, and the step S3 is carried out; if not, the PLC controls the stirring motor and the screw conveyor to stop in sequence;
s4, real-time monitoring is carried out on the blanking amount of the aluminum fluoride through the weighing sensor, the weighing sensor sends weight data to the PLC, the PLC controls the speed of the spiral conveyer according to the received weight data information, the input single addition amount of the aluminum fluoride, the single addition duration and the single addition flow rate of the aluminum fluoride, and finally quantitative mixing of the aluminum fluoride and the aluminum oxide is achieved.
In the step S1, the total amount of aluminum fluoride added is 1 to 2% of the total amount of aluminum oxide added, the number of times of aluminum fluoride addition is the same as the number of times of aluminum oxide addition, and the single amount of aluminum fluoride added is obtained by a calculation formula, wherein the calculation formula is as follows:
single addition of aluminum fluoride = total amount of aluminum oxide added x (1-2%)/. Number of times aluminum oxide was added.
In the step S2, the flow rate of single addition of aluminum fluoride is obtained by a calculation formula, wherein the calculation formula is as follows:
flow rate of single addition of aluminum fluoride (Kg/s) = total amount of aluminum fluoride addition ÷ number of times of aluminum fluoride addition ÷ length of time of single addition.
The aluminum fluoride feed control method comprises the following steps:
a. setting the total adding amount of aluminum fluoride of each aluminum electrolysis cell every day according to the total adding amount of aluminum oxide of each aluminum electrolysis cell every day, and recording the total adding amount of aluminum fluoride into the PLC;
b. and the PLC controls the total material conveyor (6) to feed materials to the aluminum fluoride blanking bin according to the recorded aluminum fluoride adding total amount, and the stop valve (10) is closed and the feeding is stopped after the weight of the aluminum fluoride reaches a set value. Aluminium fluoride weight information of aluminium fluoride blanking bin (1) is gathered in weighing sensor (3), and the aluminium fluoride weight data information transmission that weighing sensor (3) gathered gives PLC, and PLC judges according to the aluminium fluoride weight information of receipt whether the aluminium fluoride weight capacity of having carried: if not, increasing or reducing the feeding amount synchronously with the alumina feeding amount; if so, the PLC controls the aluminum fluoride blanking bin (1) to stop feeding, and the aluminum fluoride feeding is finished.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) According to the invention, the flow detection device is arranged for detecting the alumina flowing condition in the alumina conveying pipe and transmitting the information to the PLC, and the PLC controls the start and stop of the screw conveyor and the stirring motor according to the received information of the flow detection device, so that the aluminum fluoride in the aluminum fluoride discharging bin and the alumina in the alumina conveying pipe can be fully mixed, the aluminum fluoride can be continuously, uniformly and quantitatively added into the alumina according to the aluminum fluoride consumption and the alumina conveying flow of the alumina, the aluminum fluoride and the alumina can be synchronously added into the electrolytic cell after uniform mixing, the continuous, uniform and quantitative addition of the aluminum fluoride is realized, the fluctuation of the aluminum fluoride content in the electrolyte is reduced, the electrolyte molecular ratio in the electrolytic cell is stabilized, and the electrolytic current efficiency is improved.
(2) According to the invention, the weighing sensor is used for detecting the weight of the aluminum fluoride in the aluminum fluoride blanking bin in real time, so that the PLC can control the material storage bin to automatically supplement the material for the aluminum fluoride blanking bin, manual intervention is not needed, and the manual operation intensity is reduced.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a schematic structural diagram of a blanking and stirring mechanism of a storage bin.
FIG. 3 is a schematic view of the mounting of the load cell of the present invention.
The reference numbers in the above figures refer to: 1-aluminium fluoride blanking bin, 101-circular storehouse, 102-toper storehouse, 2-feed bin unloading rabbling mechanism, 21-agitator motor, 22- (mixing) shaft, 23-first group stirring piece, 24-second group stirring piece, 25-stirring head, 3-weighing sensor, 4-screw conveyer, 5-screw conveyer pipeline, 6-material storage storehouse, 7-alumina conveying pipe, 8-flow detection device, 9-conveying pipeline, 10 trip valve.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
Example one
As shown in fig. 1 to 3, the object of the present invention is achieved by the following technical solutions: the utility model provides an aluminium fluoride and aluminium oxide blending device for aluminium cell, includes material storage storehouse 6, feed bin 1 under the aluminium fluoride, feed bin unloading rabbling mechanism 2, screw conveyer 4, weighing sensor 3, trip valve 10 to and flow detection device 8. Specifically, the material storage bin 6 is a conventional feeder with powder storage and conveying functions in the prior art, and therefore the structure of the material storage bin 6 is not described in detail in this specification. PLC is connected with material storage storehouse 6, and PLC is conventional programmable control system among the prior art, therefore this description does not carry out specific repeated description to PLC's specific structure. The PLC is used as an integral operation control system of the invention, so that the aluminum fluoride and the aluminum oxide are mixed to realize automatic blanking and material supplementing. The blanking stirring mechanism 2, the screw conveyer 4 and the weighing sensor 3 are respectively connected with the PLC. In actual use, the PLC is connected with an external monitoring station and a server through a communication bus, wherein the monitoring station is responsible for checking the overall operation condition of the aluminum fluoride conveying system, including data display, history records, alarm information and the like of each groove, the field device can be operated and processed through the PLC, and the server records various history data and provides a basis for inquiring various data.
Further, the aluminum fluoride blanking bin 1 is used as a mixed blanking bin of aluminum fluoride and aluminum oxide, and the material storage bin 6 is connected with the feed end of the aluminum fluoride blanking bin 1 through a feed delivery pipe 9 and a stop valve 10. In order to reduce the interference to the static weighing result and the dynamic weighing result and prevent the powder from leaking, the cut-off valve 10 is connected with the feed end of the aluminum fluoride discharging bin 1 through a connecting hose. In use, the material storage bin 6 can deliver aluminum fluoride to the aluminum fluoride blanking bins 1 beside each electrolytic cell through a pipe chain type conveying pipeline or a pneumatic conveying chute during feeding, and a conveying pipeline 9, namely a pipe chain type conveying pipeline, is preferably used as a conveying mode in the embodiment. Feed bin unloading rabbling mechanism 2 sets up in aluminium fluoride feed bin 1, and feed bin unloading rabbling mechanism 2 mainly used stirs the aluminium fluoride powder and flows down along with gravity, can realize the unloading conveying to the aluminium fluoride powder simultaneously. The screw conveyer 4 is communicated with a feed opening of the aluminum fluoride feed bin 1 through a flange. The screw conveyor 4 in this embodiment is a conventional screw discharging machine in the prior art, and therefore, the detailed structure of the screw conveyor 4 is not described in detail in this specification. In actual use, the discharge port of the screw conveyor 4 is communicated with the alumina conveying pipe 7 through a connecting hose, so that the aluminum fluoride can be fully mixed with the alumina in the flow. In actual use, the screw conveyor 4 can be connected with the alumina conveying pipeline 7 and can also be connected with a pneumatic chute.
Simultaneously, weighing sensor 3's quantity is a plurality of, and a plurality of weighing sensor 3 even distribution are on aluminium fluoride blanking bin 1's bracket, and a plurality of weighing sensor 3 are located same horizontal plane. The weighing sensor 3 is a column type weighing sensor. As shown in fig. 3, in the present embodiment, the number of the plurality of load cells 3 is preferably set to three, and an included angle formed between two adjacent load cells is 120 °, so as to ensure the accuracy of detecting the weight of the aluminum fluoride in the aluminum fluoride blanking bin 1. The flow detection device 8 is used for detecting the flow information of the alumina, the flow detection device 8 is connected with the PLC, in actual use, the flow detection device 8 is preferably realized by adopting a microwave solid powder flow detection device, the flow detection device 8 is installed on the pipe wall of the alumina conveying pipe 7, and in actual use, the flow detection device 8 can also be fixed on a pneumatic chute. Whether have the aluminium oxide to flow in the aluminium oxide conveyer pipe 7 and detect to make PLC open and stop to feed bin unloading rabbling mechanism 2 and screw conveyer 4 through the information that flow detection device 8 detected and carry out accurate control, in order to realize aluminium fluoride and aluminium oxide's accuracy and thoughtlessly join in marriage.
Still further, as shown in fig. 1, the aluminum fluoride blanking bin 1 is composed of a round bin 101 and a conical bin 102. Specifically, a detachable bin cover is preset at the top of the circular bin 101, a feeding connection port is arranged on the preset bin cover, and a shaft hole is arranged in the center of the bin cover of the circular bin 101. The discharge end of the material storage bin 6 is connected with the circular bin 101 through a connecting pipe and a connecting hose, namely, the discharge end of the material storage bin 6 is connected with the feeding connector on the bin cover of the circular bin 101 through the connecting pipe. The conical bin 102 is communicated with the circular bin 101, and in actual production, the circular bin 101 is connected with the conical bin 102 in a welding mode to form a cylinder with the volume of 0.05-0.2m3. The angle of the conical bin 102 is a cavity with an angle of 30-70 degrees, and the conical bin 102 is a blanking end bin, so that no material blockage can be ensured in the blanking process of aluminum fluoride in use. A feeding barrel is arranged at the conical head of the conical bin 102, and the feeding end of the screw conveyor 4 is connected with the feeding barrel of the conical bin 102 through a connecting hose.
Further, as shown in fig. 2, the bin blanking agitating mechanism 2 includes an agitating motor 21, an agitating shaft 22, a first set of agitating blades 23, a second set of agitating blades 24, and an agitating head 25. Specifically, agitator motor 21 passes through the top cap center of screw vertical fixation at aluminium fluoride feed bin 1, and agitator motor 21's transmission shaft stretches into in aluminium fluoride feed bin 1 to can the free rotation, agitator motor 21 in this embodiment preferably adopts ordinary motor to realize. The PLC is connected with a stirring motor 21. The stirring shaft 22 is positioned in the aluminum fluoride blanking bin 1 and is fixedly connected with a transmission shaft of the stirring motor 21, and the length of the stirring shaft 22 is the sum of the heights of the circular bin 101 and the conical bin 102. The first group of stirring blades 23 and the second group of stirring blades 24 are horizontally fixed on the stirring shaft 22 respectively.
In actual production, the first group of stirring blades 23 and the second group of stirring blades 24 are both positioned in the circular bin 101 and the conical bin 102, so that the first group of stirring blades 23 and the second group of stirring blades 24 can rotate freely under the action of the stirring motor 21. Stirring head 25 is fixed at the lower extreme of (mixing) shaft 22, and stirring head 25 is located the discharge chamber of conical bin 102 to the realization is stirred aluminium fluoride.
During the concrete implementation, flow detection device 8 is used for detecting the aluminium oxide condition of flowing in the aluminium oxide conveyer pipe 7 to give PLC with this information transmission, PLC opens and stops according to 8 information control screw conveyer 4 of the flow detection device who receives, agitator motor 21, makes aluminium fluoride in the aluminium fluoride feed bin 1 can realize intensive mixing with the aluminium oxide in the aluminium oxide conveyer pipe 7. The speed of the spiral conveyor 4 is higher than that of the stirring motor 21 in the aluminum fluoride blanking working process, namely the discharging speed of the spiral conveyor 4 is higher than that of the blanking bin, so that the phenomenon of aluminum oxide accumulation between the aluminum fluoride blanking bin 1 and the spiral conveyor 4 is avoided.
During the timing feed supplement, PLC opens and stops according to the weight information of the aluminium fluoride in 1 storehouse under the aluminium fluoride that weighing sensor 3 gathered, the conveyer of control material storage storehouse 6, carries out quantitative feed supplement in 1 storehouse under for aluminium fluoride. The aluminum fluoride can be automatically filled, the accuracy of material supplement is ensured, meanwhile, manual intervention is not needed, and the labor force is effectively reduced.
Example two
This embodiment is a method for implementing a mixing device of aluminum fluoride and aluminum oxide for an aluminum electrolysis cell in the first embodiment, and the implementation method is as follows:
specifically, the implementation method of the aluminum fluoride and aluminum oxide mixing device for the aluminum electrolytic cell comprises an aluminum fluoride blanking control method and an aluminum fluoride supplementary material control method, wherein the aluminum fluoride blanking control method comprises the following steps:
firstly, the total adding amount of aluminum fluoride of each aluminum electrolysis cell per day is set according to the total adding amount of aluminum oxide of each aluminum electrolysis cell per day, and the single adding amount of aluminum fluoride is obtained according to the adding times of aluminum oxide. In actual production, the total adding amount of aluminum fluoride is 1-2% of the total adding amount of aluminum oxide, the adding times of aluminum fluoride are the same as the adding times of aluminum oxide, and the single adding amount of aluminum fluoride is obtained through a calculation formula, wherein the calculation formula is as follows:
single addition of aluminum fluoride = total amount of aluminum oxide added x (1-2%)/. Number of times aluminum oxide was added.
Secondly, calculating the adding flow rate of the aluminum fluoride according to the obtained single adding amount of the aluminum fluoride and the single adding duration of the aluminum oxide, and adding the obtained single adding flow rate of the aluminum fluoride, the single adding amount of the aluminum fluoride and the single adding duration of the aluminum oxide, wherein the single adding duration of the aluminum oxide is equal to the single adding duration of the aluminum fluoride. The flow rate of the single addition of aluminum fluoride is obtained by a calculation formula, wherein the calculation formula is as follows:
flow rate of single addition of aluminum fluoride (Kg/s) = total amount of aluminum fluoride addition ÷ number of times of aluminum fluoride addition ÷ length of time of single addition.
Thirdly, monitoring the alumina flowing condition in the alumina conveying pipe 7 through the flow detection device 8, transmitting monitoring information to the PLC through the flow detection device 8, and judging whether alumina flows in the alumina conveying pipe 7 or not through the PLC according to the received information; if yes, the PLC controls the spiral conveyor 4 and the stirring motor 21 to be started in sequence, and the next step is carried out. Otherwise, the PLC controls the stirring motor 21 and the screw conveyor 4 to stop in sequence. Wherein, should satisfy the speed that screw conveyer 4 speed is greater than agitator motor 21 in aluminium fluoride unloading working process, the ejection of compact speed of screw conveyer 4 is greater than the unloading speed from the feed bin promptly to guarantee not to appear aluminium oxide between aluminium fluoride feed bin 1 and screw conveyer 4 and pile up the phenomenon.
Finally, carry out real-time supervision to the unloading volume of aluminium fluoride through weighing sensor 3, weighing sensor 3 sends weight data to PLC, and PLC controls spiral conveyer 4's speed according to the weight data information of receiving and the aluminium fluoride single addition of type-in, long and the aluminium fluoride single addition velocity of flow, finally realizes aluminium fluoride and aluminium oxide's ration and thoughtlessly joins in marriage. Specifically, at aluminium fluoride unloading in-process, PLC carries out intelligent adjustment to aluminium fluoride unloading according to the real-time weight information of aluminium fluoride in feed bin 1 under the single unloading volume of typeeing and the aluminium oxide real-time flow and the aluminium fluoride of weighing sensor 3 conveying, makes aluminium fluoride can the degree of accuracy add in proportion, has ensured again that this aluminium fluoride actual unloading volume is close single setting unloading volume, makes aluminium fluoride can be even thoughtlessly join in marriage with aluminium oxide. And when the next aluminum fluoride charging is started, dynamically adjusting the current charging amount according to the last actual charging amount, and adjusting the current variable frequency rotating speed initial value in real time.
In addition, the aluminum fluoride feed control method comprises the following steps:
firstly, the total adding amount of aluminum fluoride of each aluminum electrolysis cell per day is set according to the total adding amount of aluminum oxide of each aluminum electrolysis cell per day and is recorded into the PLC. Specifically, the total adding amount of the aluminum fluoride is the total adding amount of a single day, and the total blanking amount of the aluminum fluoride is reset at the zero point every day, so that the blanking precision of the aluminum fluoride every time is ensured, the actual blanking amount of the aluminum fluoride every day is ensured to be consistent with the planned blanking amount of the aluminum fluoride in a preset single groove every day, and the control precision is improved.
Then, the PLC controls the material storage bin 6 to feed the aluminum fluoride discharging bin 1 according to the recorded aluminum fluoride adding total amount, the weighing sensor 3 collects aluminum fluoride weight information of the aluminum fluoride discharging bin 1, aluminum fluoride weight data information collected by the weighing sensor 3 is transmitted to the PLC, and the PLC judges whether the aluminum fluoride weight of the aluminum fluoride discharging bin 1 is enough or not according to the received aluminum fluoride weight information; if not, feeding is continued. If so, the PLC controls the material storage bin 6 to stop feeding, and the aluminum fluoride feeding is finished.
As described above, the present invention can be preferably realized.
Claims (10)
1. The aluminum fluoride and aluminum oxide mixing device for the aluminum electrolytic cell is characterized by comprising a material storage bin (6), a PLC (programmable logic controller) connected with the material storage bin (6), an aluminum fluoride discharging bin (1), a stop valve (10) arranged in front of a connecting hose at the upper part of the aluminum fluoride discharging bin (1), a bin discharging stirring mechanism (2) arranged in the aluminum fluoride discharging bin (1), a spiral conveyor (4) communicated with a discharging opening of the aluminum fluoride discharging bin (1), a plurality of weighing sensors (3) which are uniformly distributed on a bracket of the aluminum fluoride discharging bin (1) and are positioned on the same horizontal plane, and a flow detection device (8) connected with the PLC and used for detecting the flow information of aluminum oxide; the blanking stirring mechanism (2), the screw conveyor (4) and the weighing sensor (3) are respectively connected with the PLC; the material storage bin (6) is connected with the feed end of the aluminum fluoride discharging bin (1) through a feed conveying pipe (9) and a stop valve (10), and the feed end of the stop valve (10) and the feed end of the aluminum fluoride discharging bin (1) are connected through a connecting hose.
2. The aluminum fluoride and aluminum oxide mixing device for the aluminum electrolytic cell according to claim 1, wherein the aluminum fluoride blanking bin (1) consists of a circular bin (101) and a conical bin (102) communicated with the circular bin (101); a charging barrel is arranged at the conical head of the conical bin (102); the feeding end of the spiral conveyor (4) is connected with the discharging barrel of the conical bin (102) through a flange; the discharge end of the material storage bin (6) is connected with the circular bin (101) through a conveying pipe (9), a stop valve (10) and a connecting hose.
3. The aluminum fluoride and aluminum oxide mixing device for the aluminum electrolytic cell according to claim 1, wherein the bin blanking stirring mechanism (2) comprises a stirring motor (21), a stirring shaft (22), a first group of stirring blades (23), a second group of stirring blades (24) and a stirring head (25); the stirring motor (21) is vertically fixed in the center of a top cover of the aluminum fluoride blanking bin (1), a transmission shaft of the stirring motor (21) extends into the aluminum fluoride blanking bin (1), and the stirring shaft (22) is positioned in the aluminum fluoride blanking bin (1) and is fixedly connected with the transmission shaft of the stirring motor (21); the first group of stirring blades (23) and the second group of stirring blades (24) are horizontally fixed on the stirring shaft (22) respectively; the stirring head (25) is fixed at the lower end of the stirring shaft (22) and is positioned in a discharge cavity of the conical bin (102), and the PLC is connected with the stirring motor (21).
4. The aluminum fluoride and alumina mixing device for the aluminum reduction cell according to claim 3, wherein the first group of stirring blades (23) and the second group of stirring blades (24) are both positioned in the circular bin (101) and the conical bin (102).
5. The aluminum fluoride and aluminum oxide mixing device for the aluminum electrolytic cell according to claim 3, wherein the weighing sensor (3) is a column type weighing sensor.
6. The method for realizing the aluminum fluoride and aluminum oxide mixing device for the aluminum electrolytic cell according to claim 5, wherein the flow detection device (8) is a microwave solid powder flow detection device.
7. The method for realizing the aluminum fluoride and aluminum oxide mixing device for the aluminum electrolytic cell according to any one of claims 1 to 6, which comprises an aluminum fluoride blanking control method and an aluminum fluoride feeding control method, wherein the aluminum fluoride blanking control method comprises the following steps:
s1: setting the total adding amount of aluminum fluoride of each aluminum electrolysis cell per day according to the total adding amount of aluminum oxide of each aluminum electrolysis cell per day, and obtaining the single adding amount of aluminum fluoride according to the adding times of aluminum oxide;
s2: calculating the addition flow rate of aluminum fluoride according to the single addition amount of aluminum fluoride and the single addition duration of aluminum oxide obtained in the step S1, and obtaining the single addition flow rate of aluminum fluoride, the single addition amount of aluminum fluoride and the single addition duration of aluminum oxide, wherein the single addition duration of aluminum oxide is equal to the single addition duration of aluminum fluoride;
s3: monitoring the alumina flowing condition in the alumina conveying pipe through a flow detection device (8), transmitting monitoring information to a PLC (programmable logic controller) through the flow detection device (8), and judging whether alumina flows in the alumina conveying pipe (7) or not by the PLC according to the received information; if yes, the PLC controls the spiral conveyor (4) and the stirring motor (21) to be started in sequence, and the step S3 is carried out; if not, the PLC controls the stirring motor (21) and the screw conveyor (4) to stop in sequence;
s4, real-time monitoring is carried out on the blanking amount of the aluminum fluoride through the weighing sensor (3), the weighing sensor (3) sends weight data to the PLC, the PLC controls the speed of the spiral conveyer (4) according to the received weight data information, the recorded single addition amount of the aluminum fluoride, the single addition duration and the single addition flow rate of the aluminum fluoride, and finally quantitative mixing of the aluminum fluoride and the aluminum oxide is achieved.
8. The method for realizing the aluminum fluoride and aluminum oxide mixing device for the aluminum electrolytic cell according to claim 7, wherein in the step S1, the total amount of aluminum fluoride added is 1-2% of the total amount of aluminum oxide added, the number of times of aluminum fluoride addition is the same as the number of times of aluminum oxide addition, and the single amount of aluminum fluoride addition is obtained by a calculation formula, wherein the calculation formula is as follows:
single addition of aluminum fluoride = total amount of aluminum oxide added x (1-2%)/. Number of times aluminum oxide was added.
9. The aluminum fluoride and alumina mixing device for aluminum reduction cells according to claim 5, wherein in the step S2, the flow rate of single addition of aluminum fluoride is obtained by a calculation formula, wherein the calculation formula is as follows:
single addition of aluminum fluoride flow rate (Kg/s) = total amount of aluminum fluoride added ÷ number of times aluminum fluoride is added ÷ length of time of single addition.
10. The aluminum fluoride and alumina mixing device for the aluminum electrolysis cell according to claim 6, wherein the aluminum fluoride feeding control method comprises the following steps:
a. setting the total adding amount of aluminum fluoride of each aluminum electrolysis cell every day according to the total adding amount of aluminum oxide of each aluminum electrolysis cell every day, and recording the total adding amount of aluminum fluoride into the PLC;
b. the PLC regularly controls the aluminum fluoride adding total material conveyor (6) to feed the aluminum fluoride blanking bin, and the stop valve (10) is closed and the feeding of the aluminum fluoride blanking bin is stopped after the weight of the aluminum fluoride reaches a set value.
c. PLC passes through weighing sensor (3) and gathers the aluminium fluoride weight information of aluminium fluoride feed bin (1), and the aluminium fluoride weight data information transmission that weighing sensor (3) gathered gives PLC, and PLC judges the aluminium fluoride weight capacity whether of having carried according to the aluminium fluoride weight information of receiving: and too much frequency converter feeding amount is reduced and is synchronous with alumina conveying, too little frequency converter feeding amount is increased and is synchronous with alumina conveying, the rotating speed of the existing frequency converter is kept unchanged and is synchronous with alumina conveying in a normal range, and the PLC controls related equipment to stop feeding the aluminum fluoride discharging bin (1) when the alumina conveying is stopped.
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