CN115318193B - 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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- CN115318193B CN115318193B CN202210962564.8A CN202210962564A CN115318193B CN 115318193 B CN115318193 B CN 115318193B CN 202210962564 A CN202210962564 A CN 202210962564A CN 115318193 B CN115318193 B CN 115318193B
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- KLZUFWVZNOTSEM-UHFFFAOYSA-K Aluminum fluoride Inorganic materials F[Al](F)F KLZUFWVZNOTSEM-UHFFFAOYSA-K 0.000 title claims abstract description 225
- 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 220
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 title claims abstract description 74
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 30
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 238000005868 electrolysis reaction Methods 0.000 title claims abstract description 19
- 238000003756 stirring Methods 0.000 claims abstract description 93
- 238000007599 discharging Methods 0.000 claims abstract description 75
- 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 47
- 238000005303 weighing Methods 0.000 claims abstract description 29
- 239000000463 material Substances 0.000 claims abstract description 28
- 238000001514 detection method Methods 0.000 claims abstract description 27
- 238000003860 storage Methods 0.000 claims abstract description 24
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical compound [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000007792 addition Methods 0.000 claims description 60
- 238000012544 monitoring process Methods 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 8
- 239000000843 powder Substances 0.000 claims description 7
- 230000003203 everyday effect Effects 0.000 claims description 6
- 230000001360 synchronised effect Effects 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 description 9
- 239000003792 electrolyte Substances 0.000 description 4
- 238000009825 accumulation Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000006052 feed supplement Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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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 electrolysis 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 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 a realization method of the aluminum fluoride and aluminum oxide mixing device for the aluminum electrolysis cell, which comprises the following steps: s1: setting the total aluminum fluoride addition amount of a single aluminum cell per day according to the total aluminum oxide addition amount of the single aluminum cell per day, and obtaining the single aluminum fluoride addition amount according to the aluminum oxide addition times. According to the invention, the flow detection device is used for detecting the flowing condition of the alumina in the alumina conveying pipe, so that the PLC can accurately and automatically control the discharging of the aluminum fluoride, the aluminum fluoride and the alumina can be synchronously added into the electrolytic tank 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 electrolysis 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 is generally performed by adopting an independently operated aluminum fluoride blanking device and a fixed blanking period timing blanking mode. However, the aluminum fluoride blanking equipment which independently operates performs aluminum fluoride blanking for 1 time after reaching the interval time in operation, so that the aluminum fluoride blanking at the current time point is relatively more in quantity, the aluminum fluoride content is relatively less as the time changes, the aluminum fluoride content fluctuation in the production process of the electrolytic tank is increased as the aluminum fluoride blanking equipment is closer to the next blanking time point, the electrolyte molecular ratio is unstable, stable production is not facilitated, the power consumption is reduced, and the aluminum fluoride bin of the aluminum fluoride blanking equipment needs to be manually added with aluminum fluoride.
Therefore, the existing aluminum fluoride blanking equipment cannot realize synchronous blanking of aluminum fluoride and aluminum oxide, so that fluctuation of aluminum fluoride content in the production process of the electrolytic tank is increased, the electrolyte molecular ratio is unstable, and the stability of electrolytic aluminum production is adversely affected. Therefore, it is necessary to develop an apparatus for mixing aluminum fluoride and aluminum oxide, which can continuously, uniformly and quantitatively add aluminum fluoride into aluminum oxide in proportion according to the consumption amount of aluminum fluoride and the conveying flow rate of aluminum oxide, and can realize continuous, uniform and quantitative addition of aluminum fluoride after uniformly mixing aluminum fluoride with aluminum oxide and feeding aluminum oxide into an electrolytic cell synchronously, and a method for realizing the same.
Disclosure of Invention
The invention aims to solve the problems of the prior aluminum fluoride blanking equipment and provides an aluminum fluoride and aluminum oxide mixing device for aluminum electrolysis cells, which can continuously, uniformly and quantitatively add aluminum fluoride into aluminum oxide according to the consumption of aluminum fluoride and the conveying flow of the aluminum oxide, uniformly mix the aluminum fluoride with the aluminum oxide, synchronously blanking the aluminum oxide and adding the aluminum fluoride into an electrolysis cell, and can realize continuous, uniform and quantitative aluminum fluoride addition and aluminum oxide mixing.
The aim of the invention is achieved by the following technical scheme:
the aluminum fluoride and aluminum oxide mixing device for the aluminum electrolysis 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 screw 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 feeding end of the aluminum fluoride discharging bin through a material conveying pipe, and the material conveying pipe is connected with the feeding end of the aluminum fluoride discharging bin through a cut-off valve and a connecting hose.
As a preferable scheme of the invention, the aluminum fluoride discharging bin consists of a circular bin and a conical bin communicated with the circular bin; the cone head of the cone-shaped bin is provided with a blanking cylinder; the feeding end of the screw 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 circular bin through a connecting pipe and a connecting hose.
As a preferable scheme of the invention, the blanking stirring mechanism of the storage bin comprises a stirring motor, a stirring shaft, a first stirring piece, a second stirring piece and a stirring transmission head; the stirring motor is vertically fixed at the center of a 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 the discharging cavity of the conical bin, and the PLC is connected with the stirring motor.
As a preferable mode of the invention, the length ratio of the first stirring sheet to the second stirring sheet is 2:1, the first stirring piece is positioned in the circular bin, and the second stirring piece is positioned in the conical bin.
As a preferable mode of the invention, the load cell is a column load cell.
In addition, the flow detection device is a microwave solid powder flow detection device.
The method for realizing the aluminum fluoride and aluminum oxide mixing device for the aluminum electrolysis 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 of:
s1: setting the total aluminum fluoride addition amount of a single aluminum cell per day according to the total aluminum oxide addition amount of the single aluminum cell per day, and obtaining the single aluminum fluoride addition amount according to the aluminum oxide addition times;
s2: calculating the adding flow rate of aluminum fluoride according to the single adding amount of aluminum fluoride and the single adding time length of aluminum oxide obtained in the step S1, and adding the obtained single adding flow rate of aluminum fluoride, the single adding amount of aluminum fluoride and the single adding time length of aluminum oxide, wherein the single adding time length of aluminum oxide is equal to the single adding time length of aluminum fluoride;
s3: monitoring the flowing condition of the alumina in the alumina conveying pipe through a flow detection device, transmitting monitoring information to a PLC (programmable logic controller) by the flow detection device, and judging whether the alumina flows in the alumina conveying pipe or not by the PLC according to the received information; if yes, the PLC controls the screw 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 sequentially;
s4, monitoring the blanking amount of the aluminum fluoride in real time through a weighing sensor, sending weight data to a PLC (programmable logic controller) by the weighing sensor, and controlling the speed of the screw conveyor by the PLC according to the received weight data information, the input single adding amount of the aluminum fluoride, the single adding duration and the single adding flow rate of the aluminum fluoride, so that the quantitative mixing of the aluminum fluoride and the aluminum oxide is finally realized.
In the step S1, the total addition amount of aluminum fluoride is 1-2% of the total addition amount of aluminum oxide, the addition times of aluminum fluoride are the same as the addition times of aluminum oxide, and the single addition amount of aluminum fluoride is obtained by a calculation formula, wherein the calculation formula is as follows:
aluminum fluoride single addition amount=total aluminum oxide addition amount× (1 to 2%)/number of aluminum oxide additions.
In the step S2, the single-addition flow rate of aluminum fluoride is obtained by a calculation formula, wherein the calculation formula is as follows:
flow rate of aluminum fluoride single addition (Kg/s) =total amount of aluminum fluoride added/(number of aluminum fluoride additions/(single addition period).
The aluminum fluoride feed supplement control method comprises the following steps:
a. setting the total addition amount of aluminum fluoride of a single aluminum cell every day according to the total addition amount of aluminum oxide of the single aluminum cell every day, and inputting the total addition amount of aluminum fluoride into a PLC;
b. and the PLC controls the total material conveyor to feed the aluminum fluoride to the aluminum fluoride discharging bin according to the recorded total adding amount of the aluminum fluoride, and after the weight of the aluminum fluoride reaches a set value, the cut-off valve is closed, and the feeding is stopped. The weighing sensor collects aluminum fluoride weight information of the aluminum fluoride discharging bin, the aluminum fluoride weight data information collected by the weighing sensor is transmitted to the PLC, and the PLC judges whether the weight of the conveyed aluminum fluoride is enough according to the received aluminum fluoride weight information: if not, the feeding amount is increased or reduced and is synchronous with the alumina feeding amount; if yes, the PLC controls the aluminum fluoride discharging bin to stop feeding, and aluminum fluoride feeding is completed.
Compared with the prior art, the invention has the following advantages:
(1) According to the invention, the flow detection device is arranged for detecting the flowing condition of the alumina in the alumina conveying pipe, and the information is transmitted to the PLC, and the PLC controls the start and stop of the screw conveyor and the stirring motor according to the received flow detection device information, so that the alumina in the alumina discharging bin can be fully mixed with the alumina in the alumina conveying pipe, the alumina can be continuously and quantitatively added into the alumina according to the alumina consumption and the alumina conveying flow in proportion, the alumina and the alumina can be synchronously added into the electrolytic tank after being uniformly mixed, the continuous uniform quantitative addition of the alumina is realized, the fluctuation of the content of the alumina in the electrolyte is reduced, the electrolyte molecular ratio in the electrolytic tank is stabilized, and the electrolytic current efficiency is improved.
(2) According to the invention, the weighing sensor is used for detecting the weight of aluminum fluoride in the aluminum fluoride discharging bin in real time, so that the PLC can control the material storage bin to automatically feed the aluminum fluoride discharging bin, manual intervention is not needed, and the manual operation intensity is reduced.
Drawings
Fig. 1 is a schematic diagram of the overall structure of the present invention.
Fig. 2 is a schematic structural diagram of a blanking stirring mechanism of a stock bin.
FIG. 3 is a schematic view of the installation of the load cell of the present invention.
The reference numerals in the above figures are: 1-aluminum fluoride discharging bin, 101-round bin, 102-conical bin, 2-bin discharging stirring mechanism, 21-stirring motor, 22-stirring shaft, 23-first group stirring sheet, 24-second group stirring sheet, 25-stirring head, 3-weighing sensor, 4-screw conveyor, 5-screw conveying pipeline, 6-material storage bin, 7-aluminum oxide conveying pipe, 8-flow detection device, 9-conveying pipe and 10-cut-off valve.
Detailed Description
The present invention will be described in further detail with reference to examples, but embodiments of the present invention are not limited thereto.
Example 1
As shown in fig. 1 to 3, the purpose of the present invention is achieved by the following technical scheme: the aluminum fluoride and aluminum oxide mixing device for the aluminum electrolysis cell comprises a material storage bin 6, an aluminum fluoride discharging bin 1, a bin discharging stirring mechanism 2, a screw conveyor 4, a weighing sensor 3, a cut-off valve 10 and a flow detection device 8. Specifically, the material storage bin 6 is a conventional feeder with powder storage and conveying in the prior art, so the structure of the material storage bin 6 is not specifically described in this specification. The PLC is connected to the material storage bin 6, and is a conventional programmable control system in the prior art, so specific structures of the PLC are not specifically described in this specification. 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 feeding. The blanking stirring mechanism 2, the screw conveyor 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 record, alarm information and the like of each groove, and can operate and process field equipment through the PLC, and the server records various history data and provides basis for various data inquiry.
Further, the aluminum fluoride discharging bin 1 is used as a mixing discharging bin of aluminum fluoride and aluminum oxide, and the material storage bin 6 is connected with the feeding end of the aluminum fluoride discharging bin 1 through a conveying pipe 9 and a cut-off valve 10. In order to reduce the interference to the static weighing result and the dynamic weighing result and prevent the powder from running off, the shut-off valve 10 is connected with the feeding end of the aluminum fluoride discharging bin 1 through a connecting hose. In use, the material storage bin 6 can be fed with aluminium fluoride through a pipe chain type conveying pipeline or a pneumatic conveying chute to the aluminium fluoride discharging bin 1 beside each electrolytic cell, and in this embodiment, the conveying pipeline 9, namely the pipe chain type conveying pipeline, is preferably used as a conveying mode. The bin discharging stirring mechanism 2 is arranged in the aluminum fluoride discharging bin 1, and the bin discharging stirring mechanism 2 is mainly used for stirring aluminum fluoride powder to flow downwards along with gravity, and can realize discharging conveying of the aluminum fluoride powder. The screw conveyor 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 discharger in the prior art, and therefore, the specific structure of the screw conveyor 4 is not described in detail in this specification. In actual use, the discharge port of screw conveyor 4 is in communication with alumina delivery tube 7 via screw delivery conduit 5, allowing for adequate mixing of the alumina with the flowing alumina. In actual use, screw conveyor 4 may be connected to alumina conveying pipe 7, or to a pneumatic chute.
Meanwhile, the number of the weighing sensors 3 is multiple, the weighing sensors 3 are uniformly distributed on the bracket of the aluminum fluoride discharging bin 1, and the weighing sensors 3 are located on the same horizontal plane. The load cell 3 is a column load cell. As shown in fig. 3, in this embodiment, the number of the plurality of weighing sensors 3 is preferably set to three, and an included angle formed between two adjacent sensors is 120 °, so as to ensure accuracy of detecting the weight of aluminum fluoride in the aluminum fluoride discharging 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 arranged on the pipe wall of the alumina conveying pipe 7, and in actual use, the flow detection device 8 can also be fixed on the pneumatic chute. The aluminum oxide conveying pipe 7 can be detected whether aluminum oxide flows or not, so that the PLC can accurately control the start and stop of the bin blanking stirring mechanism 2 and the screw conveyor 4 through the information detected by the flow detection device 8, and the aluminum fluoride and the aluminum oxide can be accurately mixed.
Still further, as shown in fig. 1, the aluminum fluoride discharging bin 1 is composed of a circular 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 at 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 a feeding connecting port on a bin cover of the circular bin 101 through a connecting pipe. The conical bin 102 is communicated with the circular bin 101, and in actual production, the circular bin 101 and the conical bin 102 are connected in a welding mode, and a cylinder with the volume of 0.05-0.2 m < 3 > is formed. The angle of the conical bin 102 is 30-70 degrees, the conical bin 102 is a blanking end bin, and the aluminum fluoride blanking process can be ensured not to be blocked in use. The cone head of the cone bin 102 is provided with a blanking cylinder, and the feeding end of the screw conveyor 4 is connected with the blanking cylinder of the cone bin 102 through a connecting hose.
Further, as shown in fig. 2, the bin blanking stirring mechanism 2 includes a stirring motor 21, a stirring shaft 22, a first set of stirring blades 23, a second set of stirring blades 24, and a stirring head 25. Specifically, the stirring motor 21 is vertically fixed at the center of the top cover of the aluminum fluoride discharging bin 1 through a screw, and a transmission shaft of the stirring motor 21 extends into the aluminum fluoride discharging bin 1 and can rotate freely, and the stirring motor 21 in the embodiment is preferably realized by a common motor. The PLC is connected to the stirring motor 21. The stirring shaft 22 is positioned in the aluminum fluoride discharging 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 to the stirring shaft 22, respectively.
In actual production, the first group of stirring blades 23 and the second group of stirring blades 24 are 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 freely rotate under the action of the stirring motor 21. The stirring head 25 is fixed at the lower end of the stirring shaft 22, and the stirring head 25 is positioned in the discharging cavity of the conical bin 102 so as to stir the aluminum fluoride.
In specific implementation, the flow detection device 8 is used for detecting the flowing condition of alumina in the alumina conveying pipe 7, and transmitting the information to the PLC, and the PLC controls the start and stop of the screw conveyor 4 and the stirring motor 21 according to the received information of the flow detection device 8, so that the alumina in the alumina discharging bin 1 can be fully mixed with the alumina in the alumina conveying pipe 7. In the aluminum fluoride blanking working process, the speed of the screw conveyor 4 is higher than the speed of the stirring motor 21, namely the discharging speed of the screw conveyor 4 is higher than the blanking speed of the blanking bin, so that the phenomenon of aluminum oxide accumulation between the aluminum fluoride blanking bin 1 and the screw conveyor 4 is avoided.
When the material is fed regularly, the PLC controls the starting and stopping of the conveyor of the material storage bin 6 according to the weight information of the aluminum fluoride in the aluminum fluoride discharging bin 1 acquired by the weighing sensor 3, and the material is fed quantitatively in the aluminum fluoride discharging bin 1. The aluminum fluoride is automatically filled, the feeding accuracy is ensured, meanwhile, manual intervention is not needed, and the labor force is effectively reduced.
Example two
The embodiment is an implementation method of an aluminum fluoride and aluminum oxide mixing device 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 electrolysis 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 of:
firstly, setting the total aluminum fluoride addition amount of a single aluminum cell per day according to the total aluminum oxide addition amount of the single aluminum cell per day, and obtaining the single aluminum fluoride addition amount according to the aluminum oxide addition times. In actual production, the total addition amount of aluminum fluoride is 1-2% of the total addition amount of aluminum oxide, the addition times of aluminum fluoride are the same as the addition times of aluminum oxide, and the single addition amount of aluminum fluoride is obtained through a calculation formula, wherein the calculation formula is as follows:
aluminum fluoride single addition amount=total aluminum oxide addition amount× (1 to 2%)/number of aluminum oxide additions.
Secondly, calculating the adding flow rate of aluminum fluoride according to the obtained single adding amount of aluminum fluoride and the single adding time length of aluminum oxide, and adding the obtained single adding flow rate of aluminum fluoride, the single adding amount of aluminum fluoride and the single adding time length of aluminum oxide, wherein the single adding time length of aluminum oxide is equal to the single adding time length of aluminum fluoride. The single-addition flow rate of aluminum fluoride is obtained by a calculation formula, wherein the calculation formula is as follows:
flow rate of aluminum fluoride single addition (Kg/s) =total amount of aluminum fluoride added/(number of aluminum fluoride additions/(single addition period).
Thirdly, monitoring the flowing condition of the alumina in the alumina conveying pipe 7 through the flow detection device 8, transmitting monitoring information to the PLC by the flow detection device 8, and judging whether the alumina flows in the alumina conveying pipe 7 or not according to the received information by the PLC; if yes, the PLC controls the screw conveyor 4 and the stirring motor 21 to start in sequence, and the next step is performed. If not, the PLC controls the stirring motor 21 and the screw conveyor 4 to stop sequentially. Wherein, the speed of the screw conveyor 4 is higher than the speed of the stirring motor 21 in the aluminum fluoride discharging working process, namely the discharging speed of the screw conveyor 4 is higher than the discharging speed of the discharging bin, so as to ensure that the phenomenon of alumina accumulation does not occur between the aluminum fluoride discharging bin 1 and the screw conveyor 4.
Finally, the blanking amount of the aluminum fluoride is monitored in real time through the weighing sensor 3, the weighing sensor 3 sends weight data to the PLC, and the PLC controls the speed of the screw conveyor 4 according to the received weight data information, the input single adding amount of the aluminum fluoride, the single adding duration and the single adding flow rate of the aluminum fluoride, and finally quantitative mixing of the aluminum fluoride and the aluminum oxide is realized. Specifically, in the aluminum fluoride blanking process, the PLC intelligently adjusts the aluminum fluoride blanking amount according to the recorded single blanking amount, the real-time aluminum oxide flow and the real-time aluminum fluoride weight information in the aluminum fluoride blanking bin 1 transmitted by the weighing sensor 3, so that the aluminum fluoride can be added in proportion accurately, the actual blanking amount of the aluminum fluoride is ensured to be close to the single setting blanking amount, and the aluminum fluoride can be uniformly mixed with the aluminum oxide. And when the next aluminum fluoride charging starts, dynamically adjusting the current blanking amount according to the last actual blanking amount, and adjusting the initial value of the current frequency conversion rotating speed in real time.
In addition, the aluminum fluoride feed control method comprises the following steps:
firstly, setting the total addition amount of aluminum fluoride of a single aluminum cell every day according to the total addition amount of aluminum oxide of the single aluminum cell every day, and inputting the total addition amount of aluminum fluoride into a PLC. Specifically, the total adding amount of aluminum fluoride is the total adding amount of a single day, and the total aluminum fluoride blanking amount per day is cleared at zero point, so that the precision of aluminum fluoride blanking each time is ensured, the actual aluminum fluoride blanking amount per day is ensured to be consistent with the preset single-groove aluminum fluoride planned blanking amount per day, and the control precision is improved.
Then, the PLC controls a material storage bin 6 to feed the aluminum fluoride discharging bin 1 according to the recorded total adding amount of aluminum fluoride, a weighing sensor 3 collects aluminum fluoride weight information of the aluminum fluoride discharging bin 1, the 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 according to the received aluminum fluoride weight information; if not, feeding is continued. If yes, the PLC controls the material storage bin 6 to stop feeding, and the aluminum fluoride feeding is completed.
As described above, the present invention can be well implemented.
Claims (7)
1. The aluminum fluoride and aluminum oxide mixing device for the aluminum electrolysis 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 cut-off 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 screw conveyor (4) communicated with a discharging opening of the aluminum fluoride discharging bin (1), a plurality of weighing sensors (3) uniformly distributed on a bracket of the aluminum fluoride discharging bin (1) and positioned on the same horizontal plane, and a flow detection device (8) connected with the PLC and used for detecting flow information of aluminum oxide; the bin discharging stirring mechanism (2) and the screw conveyor (4) and the weighing sensor (3) are respectively connected with the PLC; the material storage bin (6) is connected with the feeding end of the aluminum fluoride discharging bin (1) through a conveying pipe (9) and a cut-off valve (10), and the cut-off valve (10) is connected with the feeding end of the aluminum fluoride discharging bin (1) through a connecting hose;
the aluminum fluoride discharging bin (1) consists of a circular bin (101) and a conical bin (102) communicated with the circular bin (101); the conical head of the conical bin (102) is provided with a blanking cylinder; the feeding end of the screw conveyor (4) is connected with the discharging barrel of the conical bin (102) through a flange; the discharging end of the material storage bin (6) is connected with the circular bin (101) through a conveying pipe (9), a cut-off valve (10) and a connecting hose;
the bin blanking stirring mechanism (2) comprises a stirring motor (21), a stirring shaft (22), a first group of stirring sheets (23), a second group of stirring sheets (24) and a stirring head (25); the stirring motor (21) is vertically fixed at the center of a top cover of the aluminum fluoride discharging bin (1), a transmission shaft of the stirring motor (21) extends into the aluminum fluoride discharging bin (1), and the stirring shaft (22) is positioned in the aluminum fluoride discharging bin (1) and is fixedly connected with the transmission shaft of the stirring motor (21); the first group of stirring sheets (23) and the second group of stirring sheets (24) are respectively and horizontally fixed on the stirring shaft (22); the stirring head (25) is fixed at the lower end of the stirring shaft (22) and is positioned in the discharging cavity of the conical bin (102), and the PLC is connected with the stirring motor (21);
the first group of stirring sheets (23) and the second group of stirring sheets (24) are both positioned in the circular bin (101) and the conical bin (102).
2. The aluminum fluoride and aluminum oxide mixing device for aluminum electrolysis cell according to claim 1, wherein the load cell (3) is a column type load cell.
3. The aluminum fluoride and aluminum oxide mixing device for aluminum electrolysis cell according to claim 2, wherein the flow rate detection device (8) is a microwave solid powder flow rate detection device.
4. The method for realizing the aluminum fluoride and aluminum oxide mixing device for the aluminum electrolysis cell according to any one of claims 1 to 3, comprising 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 aluminum fluoride addition amount of a single aluminum cell per day according to the total aluminum oxide addition amount of the single aluminum cell per day, and obtaining the single aluminum fluoride addition amount according to the aluminum oxide addition times;
s2: calculating the adding flow rate of aluminum fluoride according to the single adding amount of aluminum fluoride and the single adding time length of aluminum oxide obtained in the step S1, and adding the obtained single adding flow rate of aluminum fluoride, the single adding amount of aluminum fluoride and the single adding time length of aluminum oxide, wherein the single adding time length of aluminum oxide is equal to the single adding time length of aluminum fluoride;
s3: monitoring the flowing condition of the alumina in the alumina conveying pipe through a flow detection device (8), transmitting monitoring information to a PLC (programmable logic controller) by the flow detection device (8), and judging whether the alumina flows in the alumina conveying pipe (7) according to the received information by the PLC; if yes, the PLC controls the screw 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, monitoring the blanking amount of the aluminum fluoride in real time through a weighing sensor (3), sending weight data to a PLC (programmable logic controller) by the weighing sensor (3), and controlling the speed of the screw conveyor (4) by the PLC according to the received weight data information, the input single adding amount of the aluminum fluoride, the single adding duration and the single adding flow rate of the aluminum fluoride, so as to finally realize quantitative mixing of the aluminum fluoride and the aluminum oxide.
5. The method for realizing the aluminum fluoride and aluminum oxide mixing device for the aluminum electrolysis cell according to claim 4, wherein in the step S1, the total addition amount of aluminum fluoride is 1-2% of the total addition amount of aluminum oxide, the addition times of aluminum fluoride are the same as the addition times of aluminum oxide, and the single addition amount of aluminum fluoride is obtained by a calculation formula, wherein the calculation formula is as follows:
aluminum fluoride single addition amount=total aluminum oxide addition amount× (1 to 2%)/number of aluminum oxide additions.
6. The method for realizing the aluminum fluoride and aluminum oxide mixing device for the aluminum electrolysis cell according to claim 5, wherein in the step S2, the single-addition flow rate of aluminum fluoride is obtained by a calculation formula, and the calculation formula is as follows:
flow rate of aluminum fluoride single addition (Kg/s) =total amount of aluminum fluoride added/(number of aluminum fluoride additions/(single addition period).
7. The method for realizing the aluminum fluoride and aluminum oxide mixing device for the aluminum electrolysis cell according to claim 6, wherein the aluminum fluoride feed control method comprises the following steps:
a. setting the total addition amount of aluminum fluoride of a single aluminum cell every day according to the total addition amount of aluminum oxide of the single aluminum cell every day, and inputting the total addition amount of aluminum fluoride into a PLC;
b. the PLC controls the aluminum fluoride adding total material conveyor to feed the aluminum fluoride discharging bin at regular time, and after the weight of the aluminum fluoride reaches a set value, a cut-off valve (10) is closed, and the feeding of the aluminum fluoride discharging bin is stopped;
c. the PLC acquires aluminum fluoride weight information of the aluminum fluoride discharging bin (1) through the weighing sensor (3), the aluminum fluoride weight data information acquired by the weighing sensor (3) is transmitted to the PLC, and the PLC judges whether the weight of the conveyed aluminum fluoride is enough or not according to the received aluminum fluoride weight information: and if the frequency converter feeding amount is too large, the frequency converter feeding amount is reduced and is synchronous with alumina conveying, if the frequency converter feeding amount is too small, the frequency converter feeding amount is increased and is synchronous with alumina conveying, and if the frequency converter feeding amount is too small, 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 of the aluminum fluoride blanking bin (1) when alumina conveying is stopped.
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