CN114318419A - Automatic continuous feeding system and method for magnesium electrolytic cell - Google Patents
Automatic continuous feeding system and method for magnesium electrolytic cell Download PDFInfo
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- CN114318419A CN114318419A CN202210043996.9A CN202210043996A CN114318419A CN 114318419 A CN114318419 A CN 114318419A CN 202210043996 A CN202210043996 A CN 202210043996A CN 114318419 A CN114318419 A CN 114318419A
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Abstract
The invention relates to a magnesium electrolytic cell automatic continuous feeding system and a method, aiming at solving the problem of electrolyte liquid level fluctuation, the electrolytic cell is provided with a feeding magnesium-pumping hole, a liquid level meter and a submerged tank, and the electrolytic cell is provided with an intelligent controller and a plurality of continuous automatic continuous feeding devices of magnesium chloride liquid heat-preservation ladles; a ladle gravity sensor is arranged below the ladle, a sealed loose joint ladle automatic argon filling pipe valve and a gas phase pressure sensor at the upper end of the ladle and a sealed loose joint plug-in are used for being plugged with a feeding magnesium pumping hole in a sealing way and extending downwards to a magnesium chloride liquid feeding pipe at the bottom in the ladle, and an intelligent controller electrically connected with a liquid level meter, the gravity sensor and the gas phase pressure sensor is electrically connected with an exhaust pipe filling valve for controlling the extending connection of the automatic argon filling pipe valve and the exhaust pipe; the two charging magnesium-extracting holes are respectively used for charging magnesium chloride liquid and extracting magnesium liquid or continuously charging magnesium chloride liquid. The method has the advantages of greatly reducing electrolyte level fluctuation, obviously improving production efficiency and liquid magnesium product quality, prolonging the service life of the electrolytic cell and having good reliability.
Description
Technical Field
The invention relates to a magnesium electrolytic cell feeding device, in particular to an automatic continuous magnesium electrolytic cell feeding system and method.
Background
At present, in the electrolytic production of magnesium metal and chlorine gas by magnesium chloride, especially in the industrial production using multi-electrode electrolytic cell, the electrolyte is mostly MgCl2NaCl and CaCl2And carrying out electrolytic production on the ternary electrolyte. The feeding mode of the magnesium chloride adopts a magnesium chloride ladle to intermittently and rapidly supplement molten magnesium chloride into a magnesium collecting chamber of the electrolytic cell, such as: the feeding is carried out 6-8 times every day, about 2 tons of the feeding is carried out every time, and the feeding time is about 3 minutes every time. The feeding mode has the following defects: (1) MgCl in electrolyte composition in electrolytic cell2The content is changed between 16 percent and 23 percent, so that the electrolytic process is unstable; (2) the rapid feeding enables the slag (mainly oxides and nitrides of magnesium and corroded refractory brick particles) deposited at the bottom of the magnesium collecting chamber to be rolled up and enter the electrolytic chamber along with the circulation of electrolyte, and the slag adheres to the surface of an electrode to cause the passivation of the electrode; (3) the rapid feeding causes the liquid level of the electrolytic cell to fluctuate too much, which can cause air to be sucked from the feeding port to cause the oxidation and nitridation loss of liquid magnesium on the surface of the magnesium collecting chamber on the one hand, and can also cause the current short circuit phenomenon of the electrolytic chamber due to the overhigh liquid level on the other hand. The existing feeding mode has the defects of reduced current efficiency of the electrolytic cell, reduced production efficiency, fast graphite anode corrosion and high impurity content in the production liquid magnesium.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides an automatic continuous magnesium electrolytic cell feeding system which can greatly reduce electrolyte liquid level fluctuation, obviously improve production efficiency and liquid magnesium product quality and prolong the service life of an electrolytic cell, and also provides an automatic continuous magnesium electrolytic cell feeding method realized on the system.
In order to realize the aim, the automatic continuous feeding system of the magnesium electrolytic cell is characterized in that a large magnesium collecting chamber cover of a closed electrolytic cell is hermetically provided with a feeding magnesium-pumping hole, a liquid level meter and a gas charging and discharging pipe which is fixedly connected downwards and communicated with a submerged tank for stabilizing the liquid level of the electrolytic cell, the feeding magnesium-pumping hole is used for supplying magnesium heat-preservation ladles for pumping liquid magnesium and also supplying magnesium chloride liquid for the magnesium chloride liquid heat-preservation ladles for filling magnesium chloride liquid, the automatic continuous feeding system is characterized in that the electrolytic cell is provided with an intelligent controller and at least two automatic continuous feeding devices of magnesium chloride liquid heat-preservation ladles which are overlapped and continuously used from front to back, the front and back continuous feeding of the at least two parallel magnesium chloride liquid heat-preservation ladles are carried out, and the liquid magnesium is pumped from the magnesium collecting chamber according to the requirement while the continuous feeding is carried out; a ladle gravity sensor is arranged below the magnesium chloride liquid heat-preservation ladle or a ladle gravity sensor arranged beside the electrolytic cell is arranged below the magnesium chloride liquid heat-preservation ladle, the sealed loose joint ladle automatic argon-filling pipe valve, a ladle gas-phase pressure sensor and a sealed loose joint plug of the upper end of the magnesium chloride liquid heat-preservation ladle of the ladle exhaust pipe valve are matched with a magnesium chloride liquid charging pipe which is hermetically inserted with the charging magnesium-pumping hole and extends downwards to the bottom in the ladle, the liquid level meter, the ladle gravity sensor and the ladle gas-phase pressure sensor are electrically connected with an intelligent controller, and the intelligent controller is electrically connected with a charging exhaust pipe valve which is used for controlling the ladle automatic argon-filling pipe valve and the charging exhaust pipe to be in extended connection; the feeding magnesium-extracting holes are at least two arranged in parallel, wherein when one of the feeding magnesium-extracting holes is used for filling magnesium chloride liquid, the other feeding magnesium-extracting holes are used for extracting liquid magnesium or used for continuously filling the magnesium chloride liquid. The method has the advantages of greatly reducing the fluctuation of electrolyte liquid level, obviously improving the production efficiency and the quality of liquid magnesium products and prolonging the service life of the electrolytic cell.
As optimization, the gas charging and discharging pipe valve is a submerged tank gas discharging pipe valve and a submerged tank gas charging pipe valve which are communicated in parallel with each other through a gas charging and discharging pipe and are respectively used for gas discharging and charging of a submerged tank under the control of an intelligent controller; the ladle automatic argon filling pipe valve and the submerged tank gas filling pipe valve which are parallel to the ladle exhaust pipe valve are communicated with a pressure argon station through a pipeline; the ladle exhaust pipe valve and the submerged tank exhaust pipe valve are communicated with a tail gas treatment system through a pipeline.
As optimization, the feeding magnesium-extracting hole and the ladle gravity sensor are at least two sets of parallel sensors which are respectively arranged on the large cover of the magnesium collecting chamber and beside the electrolytic bath; one set of the magnesium liquid heat-preservation ladle is used for continuously matching with a forward magnesium chloride liquid heat-preservation ladle, and the other set of the magnesium liquid heat-preservation ladle is used for continuously matching with a subsequent magnesium chloride liquid heat-preservation ladle for continuously feeding the forward magnesium chloride liquid heat-preservation ladle or is used for continuously matching with the forward magnesium chloride liquid heat-preservation ladle.
As optimization, the subsequent magnesium chloride liquid heat preservation ladle is a pre-continuously-matched subsequent magnesium chloride liquid heat preservation ladle which is pre-continuously matched when a certain magnesium chloride liquid allowance still exists in the previous magnesium chloride liquid heat preservation ladle, and the feeding magnesium-extracting hole and the ladle gravity sensor after the feeding of the previous magnesium chloride liquid heat preservation ladle is finished and removed are used for being continuously matched with a liquid magnesium heat preservation ladle which extracts liquid magnesium from the upper layer of the magnesium collecting chamber; and a liquid magnesium pumping pipe of the liquid magnesium heat-preservation ladle is downwards hermetically inserted into the feeding magnesium pumping hole and is downwards extended to a liquid magnesium layer of the magnesium collecting chamber to pump liquid magnesium, and the ladle gravity sensor is used for measuring the liquid magnesium pumping speed and the quantity of the liquid magnesium heat-preservation ladle in real time.
The balance of the magnesium chloride liquid is 160-240kg, preferably 200 kg. The electrolytic cell is divided into an upper liquid magnesium layer with a lower electrolyte layer in an upper magnesium collecting chamber by a vertical partition wall with the lower part transversely communicated, and a magnesium chloride liquid feeding pipe is inserted into the position 20-30 cm below the upper liquid magnesium layer. The liquid level meter and the gas charging and discharging pipe of the submerged tank are respectively and fixedly arranged on the gas charging and discharging pipe mounting hole and the liquid level meter mounting hole on the large cover of the magnesium collecting chamber in a sealing way. The intelligent controller is electrically connected with at least two sets of parallel ladle gravity sensors, the ladle gas-phase pressure sensor and the ladle automatic argon pipe filling valve and simultaneously electrically connected with one set of gas filling and discharging pipe valve; the intelligent controller is matched with a plurality of sets of magnesium chloride liquid heat preservation ladles which are alternately and continuously used.
As optimization, the electrolytic cell is provided with a working condition detection device for detecting the electrolytic current and the electrolytic efficiency in real time, and the liquid level meter, the ladle gravity sensor, the ladle gas phase pressure sensor and the working condition detection device control the automatic argon pipe filling valve of the ladle through an intelligent controller, so that the real-time feeding speed control of the magnesium chloride liquid and the electrolyte liquid level control in the stable electrolytic cell are realized; the submerged tank is a vertical cylinder container provided with a bottom flow liquid hole, the upper layer of the inner cavity of the vertical cylinder container stores and controls a gas phase, the lower layer of the inner cavity of the vertical cylinder container is an electrolyte liquid phase communicated with the lower layer of the magnesium collecting chamber, and the liquid level meter controls the gas charging and discharging pipe valve in real time through an intelligent controller to perform stability auxiliary control on the electrolyte liquid level in the electrolytic cell.
The automatic continuous feeding method of the magnesium electrolytic cell is characterized in that a feeding magnesium-pumping hole and a liquid level meter are hermetically arranged on a large cover of a magnesium collecting chamber of a closed electrolytic cell, and a gas charging and discharging pipe communicated with a submerged tank for stabilizing the liquid level of the electrolytic cell is fixedly connected downwards; a ladle gravity sensor is arranged below the magnesium chloride liquid heat preservation ladle or a ladle gravity sensor arranged beside the electrolytic cell is arranged below the magnesium chloride liquid heat preservation ladle, the upper end of the magnesium chloride liquid heat preservation ladle of a ladle exhaust pipe valve is sealed and movably connected with an automatic ladle argon filling pipe valve, a ladle gas phase pressure sensor and a sealed movable plug which are used for being in sealed plug fit with a feeding magnesium pumping hole and extending downwards to a magnesium chloride liquid feeding pipe at the bottom in the ladle, a liquid level meter, the ladle gravity sensor and the ladle gas phase pressure sensor are electrically connected with an intelligent controller, and the intelligent controller is electrically connected with a gas filling and exhausting pipe valve for controlling the ladle automatic argon filling pipe valve and the gas filling and exhausting pipe to be in extended connection; the feeding magnesium-extracting holes are at least two arranged in parallel, wherein when one of the feeding magnesium-extracting holes is used for filling magnesium chloride liquid, the other feeding magnesium-extracting holes are used for extracting liquid magnesium or used for continuously filling the magnesium chloride liquid. The method has the advantages of greatly reducing the fluctuation of electrolyte liquid level, obviously improving the production efficiency and the quality of liquid magnesium products and prolonging the service life of the electrolytic cell.
As optimization, the gas charging and discharging pipe valve is a submerged tank gas discharging pipe valve and a submerged tank gas charging pipe valve which are communicated in parallel with each other through a gas charging and discharging pipe and are respectively used for gas discharging and charging of a submerged tank under the control of an intelligent controller; the ladle automatic argon filling pipe valve and the submerged tank gas filling pipe valve which are parallel to the ladle exhaust pipe valve are communicated with a pressure argon station through a pipeline; the ladle exhaust pipe valve and the submerged tank exhaust pipe valve are communicated with a tail gas treatment system through a pipeline.
As optimization, the feeding magnesium-extracting hole and the ladle gravity sensor are at least two sets of parallel sensors which are respectively arranged on the large cover of the magnesium collecting chamber and beside the electrolytic bath; one set of the magnesium liquid heat-preservation ladle is used for continuously matching with a forward magnesium chloride liquid heat-preservation ladle, and the other set of the magnesium liquid heat-preservation ladle is used for continuously matching with a subsequent magnesium chloride liquid heat-preservation ladle for continuously feeding the forward magnesium chloride liquid heat-preservation ladle or is used for continuously matching with the forward magnesium chloride liquid heat-preservation ladle.
As optimization, the subsequent magnesium chloride liquid heat preservation ladle is a pre-continuously-matched subsequent magnesium chloride liquid heat preservation ladle which is pre-continuously matched when a certain magnesium chloride liquid allowance still exists in the previous magnesium chloride liquid heat preservation ladle, and the feeding magnesium-extracting hole and the ladle gravity sensor after the feeding of the previous magnesium chloride liquid heat preservation ladle is finished and removed are used for being continuously matched with a liquid magnesium heat preservation ladle which extracts liquid magnesium from the upper layer of the magnesium collecting chamber; and a liquid magnesium pumping pipe of the liquid magnesium heat-preservation ladle is downwards hermetically inserted into the feeding magnesium pumping hole and is discharged to a liquid magnesium layer of the magnesium collecting chamber to pump liquid magnesium, and the ladle gravity sensor is used for measuring the liquid magnesium pumping speed and the quantity of the liquid magnesium heat-preservation ladle in real time.
The balance of the magnesium chloride liquid is 160-240kg, preferably 200 kg. The electrolytic cell is divided into an upper liquid magnesium layer with a lower electrolyte layer in an upper magnesium collecting chamber by a vertical partition wall with the lower part transversely communicated, and a magnesium chloride liquid feeding pipe is inserted into the position 20-30 cm below the upper liquid magnesium layer. The liquid level meter and the gas charging and discharging pipe of the submerged tank are respectively and fixedly arranged on the gas charging and discharging pipe mounting hole and the liquid level meter mounting hole on the large cover of the magnesium collecting chamber in a sealing way. The intelligent controller is electrically connected with at least two sets of parallel ladle gravity sensors, the ladle gas-phase pressure sensor and the ladle automatic argon pipe filling valve and simultaneously electrically connected with one set of gas filling and discharging pipe valve; the intelligent controller is matched with a plurality of sets of magnesium chloride liquid heat preservation ladles which are alternately and continuously used in a continuous measurement and control mode.
As optimization, the electrolytic cell is provided with a working condition detection device for detecting the electrolytic current and the electrolytic efficiency in real time, and the liquid level meter, the ladle gravity sensor, the ladle gas phase pressure sensor and the working condition detection device control the automatic argon pipe filling valve of the ladle through an intelligent controller, so that the real-time feeding speed control of the magnesium chloride liquid and the electrolyte liquid level control in the stable electrolytic cell are realized; the submerged tank is a vertical cylinder container provided with a bottom flow liquid hole, the upper layer of the inner cavity of the vertical cylinder container stores and controls a gas phase, the lower layer of the inner cavity of the vertical cylinder container is an electrolyte liquid phase communicated with the lower layer of the magnesium collecting chamber, and the liquid level meter controls the gas charging and discharging pipe valve in real time through an intelligent controller to perform stability auxiliary control on the electrolyte liquid level in the electrolytic cell.
The method and the system mainly comprise a magnesium chloride heat-preservation ladle, a magnesium chloride liquid feeding pipe, a ladle automatic argon filling pipe valve, a ladle exhaust pipe valve, a ladle gas phase pressure sensor, a ladle gravity sensor, an intelligent controller and the like.
Two charging and magnesium-extracting holes are arranged on a large cover of a magnesium collecting chamber of the electrolytic cell and are used for continuously charging and extracting liquid magnesium. Two magnesium chloride thermal insulation ladles are used, both placed beside the electrolytic cell, one for continuous charging and the other for receiving molten magnesium chloride from the reduction process of titanium sponge production. In the production process, two magnesium chloride heat-preservation ladles and two charging magnesium-pumping holes are alternately used.
The magnesium chloride heat preservation ladle receives molten magnesium chloride from the reduction process of the titanium sponge production, then the molten magnesium chloride is conveyed to the magnesium electrolysis process, and the magnesium chloride heat preservation ladle is placed on a ladle gravity sensor beside the electrolytic bath. And inserting the outlet end of a magnesium chloride feeding pipe into electrolyte from a feeding magnesium-extracting hole of the electrolytic cell, wherein the insertion depth of the feeding pipe is 20-30 cm below a liquid magnesium layer, and simultaneously inserting the inlet end of the magnesium chloride liquid feeding pipe into a magnesium chloride heat-preservation ladle. And connecting a ladle argon filling pipe valve on the magnesium chloride heat-preservation ladle with an argon system, and electrically connecting a ladle gravity sensor, a ladle gas-phase pressure sensor and an automatic ladle argon filling pipe valve with an intelligent controller.
Under the condition that a ladle exhaust pipe valve of the magnesium chloride heat-preservation ladle is closed, argon is filled into the ladle to continuously press magnesium chloride liquid in the ladle into the electrolytic cell. The speed of discharging the magnesium chloride liquid from the two-man ladle is related to the gas phase pressure in the two-man ladle, and the gas phase pressure in the two-man ladle is fed back and set through a gravity reduction signal fed back by a two-man ladle gravity sensor. The gas phase pressure in the ladle is realized by the chain control of a ladle gas phase pressure sensor and an automatic argon filling pipe valve of the ladle. In addition, the control value of the feeding speed of the magnesium chloride liquid is determined by the direct current and the current efficiency of the electrolytic cell, and the feeding speed of the magnesium chloride can be controlled according to the liquid level fluctuation condition of the electrolytic cell.
Before the magnesium chloride liquid in a two-man ladle of an automatic feeding system is close to the end of feeding, for example, when about 200kg of magnesium chloride liquid is left in the two-man ladle, another automatic continuous feeding device is arranged at another feeding magnesium-extracting hole of the electrolytic cell to realize the continuous feeding operation that the feeding of the former is stopped and the feeding of the latter is carried out in time. And (4) removing the magnesium chloride liquid feeding pipe which stops feeding from a feeding port of the electrolytic bath, and using the feeding port for extracting the liquid magnesium. And (3) after a magnesium chloride liquid feeding pipe and other connecting systems related to the magnesium chloride two-man ladle are dismantled, the magnesium chloride two-man ladle is sent to a reduction process for producing titanium sponge to receive molten magnesium chloride for alternate use.
The invention has the advantages and effects that: 1. by utilizing the automatic continuous feeding device, the stability of electrolyte components in the magnesium chloride electrolysis process is realized, the electrolysis production process is stable, and the production efficiency is improved. 2. The automatic continuous feeding device of the invention greatly reduces the electrolyte liquid level fluctuation in the electrolytic cell, improves the current efficiency and the production efficiency of the electrolytic cell, and improves the quality of liquid magnesium products. 3. The automatic continuous feeding device can effectively prevent the slag at the bottom of the electrolytic cell from rolling up and entering the electrolyte, prolong the service life of the graphite anode and improve the current efficiency and the production efficiency of the electrolytic cell.
After the technical scheme is adopted, the automatic continuous feeding system and the method for the magnesium electrolytic cell have the advantages of greatly reducing electrolyte liquid level fluctuation, obviously improving production efficiency and quality of liquid magnesium products, prolonging service life of the electrolytic cell and having good reliability.
Drawings
FIG. 1 is a schematic structural view of an automatic continuous feeding system of a magnesium electrolytic cell of the present invention; FIG. 2 is a schematic top view showing the structure of the electrolytic cell part of the automatic continuous feeding system for a magnesium electrolytic cell of the present invention. Reference numbers in the figures: the device comprises an electrolytic cell 1, a vertical partition wall 11, a magnesium collecting chamber 12, a magnesium collecting chamber large cover 121, an electrolytic chamber 13, an electrolytic chamber large cover 131, an anode 14, a cathode 15, a charging and magnesium pumping hole 16, a submerged tank 2, a charging and exhaust pipe mounting hole 21, a submerged tank exhaust pipe valve 211, a submerged tank charging pipe valve 212, a liquid level meter 3, a liquid level meter mounting hole 31, a magnesium chloride liquid heat-preserving ladle 41, a ladle exhaust pipe valve 44, a ladle automatic argon filling pipe valve 45, a ladle gas phase pressure sensor 46, a magnesium chloride liquid charging pipe 43, an intelligent controller 5, a ladle gravity sensor 42, an automatic continuous charging device 4 and an exhaust pipe 20.
Detailed Description
As shown in the figure, the automatic continuous feeding system of the magnesium electrolytic cell is characterized in that a large magnesium collecting chamber cover 121 of a closed electrolytic cell 1 is hermetically provided with a feeding magnesium pumping hole 16, a liquid level meter 3 and a gas charging and discharging pipe 20 which is fixedly communicated with a submerged tank 2 for stabilizing the liquid level of the electrolytic cell 1, the feeding magnesium pumping hole 16 is used for supplying magnesium to a magnesium heat-preservation ladle to pump liquid magnesium and also supplying magnesium chloride to a magnesium chloride liquid heat-preservation ladle 41 to fill magnesium chloride liquid; the electrolytic cell 1 is connected with an automatic continuous feeding device 4 which comprises an intelligent controller 5 and at least two magnesium chloride liquid heat preservation ladles 41 which are overlapped in front and back and are continuously used, the magnesium collecting chamber 12 is continuously fed with the at least two magnesium chloride liquid heat preservation ladles 41 which are arranged in parallel in front and back, and liquid magnesium is extracted from the magnesium collecting chamber 12 by the liquid magnesium heat preservation ladles according to the requirement while continuous feeding is carried out; a ladle gravity sensor 42 arranged beside the electrolytic bath 1 is arranged below the magnesium chloride liquid heat preservation ladle 41, or a ladle gravity sensor is arranged below the magnesium chloride liquid heat preservation ladle; the upper end of a magnesium chloride liquid heat-preservation ladle 41 of a distribution ladle exhaust pipe valve 44 is provided with a sealed loose joint ladle automatic argon filling pipe valve 45, a ladle gas-phase pressure sensor 46 and a sealed loose joint plug-in connection pipe 43 which is used for being in sealed plug-in connection with a feeding magnesium pumping hole 16 and extending downwards to the inner bottom of the ladle, a liquid level meter 3, a ladle gravity sensor 42 and the ladle gas-phase pressure sensor 46 are electrically connected with an intelligent controller 5, and the intelligent controller 5 is electrically connected with a filling exhaust pipe valve for controlling the ladle automatic argon filling pipe valve 45 and the filling exhaust pipe 20 to be in extended connection; the feeding magnesium extraction holes 16 are at least two arranged in parallel, wherein when one of the feeding magnesium extraction holes is used for filling magnesium chloride liquid, the other feeding magnesium extraction holes are used for extracting liquid magnesium or used for continuously filling the magnesium chloride liquid. The method has the advantages of greatly reducing the fluctuation of electrolyte liquid level, obviously improving the production efficiency and the quality of liquid magnesium products and prolonging the service life of the electrolytic cell.
The gas charging and discharging pipe valves are a submerged tank gas discharging pipe valve 211 and a submerged tank gas charging pipe valve 212 which are communicated with the gas charging and discharging pipe 20 in parallel and used for charging argon gas, and are respectively used for gas discharging and charging of the submerged tank 2 under the control of the intelligent controller 5; the ladle automatic argon-filling pipe valve 45 and the submerged tank gas-filling pipe valve 212 which are parallel to the ladle exhaust pipe valve 44 are communicated with an argon station through pipelines. The ladle exhaust pipe valve 44 and the submerged tank exhaust pipe valve 211 are communicated with the tail gas treatment system through pipelines.
The feeding magnesium-extracting hole 16 and the ladle gravity sensor 42 are at least two sets of parallel arranged on the magnesium collecting chamber large cover 121 and beside the electrolytic bath 1 respectively; one set of the two-man ladle is used for being continuously matched with a forward magnesium chloride liquid heat-preservation ladle 41, the other set of the two-man ladle is used for being continuously matched with a subsequent magnesium chloride liquid heat-preservation ladle 41 for charging the continuous forward magnesium chloride liquid heat-preservation ladle 41 or being used for being matched with the continuous forward magnesium chloride liquid heat-preservation ladle 41, and when the forward magnesium chloride liquid heat-preservation ladle 41 is charged, liquid magnesium is extracted from the magnesium collecting chamber 12. The subsequent magnesium chloride liquid heat preservation ladle 41 is a pre-continuous subsequent magnesium chloride liquid heat preservation ladle which is pre-continuously prepared when the previous magnesium chloride liquid heat preservation ladle 41 still has a certain magnesium chloride liquid surplus, and the feeding magnesium-extracting hole 16 and the ladle gravity sensor 42 after the previous magnesium chloride liquid heat preservation ladle 41 finishes feeding and removing are used for being continuously matched with a liquid magnesium heat preservation ladle which extracts liquid magnesium from the upper layer of the magnesium collecting chamber 12; and a liquid magnesium pumping pipe of the liquid magnesium heat-preservation ladle is downwards hermetically inserted into the feeding magnesium pumping hole and is discharged to a liquid magnesium layer of the magnesium collecting chamber to pump liquid magnesium, and the ladle gravity sensor is used for measuring the liquid magnesium pumping speed and the quantity of the liquid magnesium heat-preservation ladle in real time. The balance of the magnesium chloride liquid is 160-240kg, preferably 200 kg.
The electrolytic cell 1 is divided into an upper liquid magnesium layer with a lower electrolyte layer in an upper magnesium collecting chamber 12 by a vertical partition wall 11 with the lower part transversely communicated, and a magnesium chloride liquid feeding pipe 43 is inserted into the position 20-30 cm below the upper liquid magnesium layer. The liquid level meter 3 and the gas charging and discharging pipe 20 of the submerged tank 2 are respectively and fixedly arranged on a gas charging and discharging pipe mounting hole 21 and a liquid level meter mounting hole 31 on the magnesium collecting chamber large cover 121 in a sealing way. The intelligent controller 5 is electrically connected with two sets of parallel ladle gravity sensors 42, the ladle gas-phase pressure sensor 46 and the ladle automatic argon filling pipe valve 45 and simultaneously electrically connected with one set of air filling and exhausting pipe valve; the intelligent controller 5 is provided with two sets of magnesium chloride liquid heat preservation ladles 41 which are alternately and continuously used in a testing and controlling way.
The electrolytic cell 1 is provided with a working condition detection device for detecting the electrolytic current and the electrolytic efficiency in real time, and the liquid level meter 3, the ladle gravity sensor 42, the ladle gas phase pressure sensor 46 and the working condition detection device control the automatic ladle argon filling pipe valve 45 through the intelligent controller 5, so that the real-time feeding speed control of the magnesium chloride liquid and the electrolyte liquid level control in the stable electrolytic cell are realized; the submerged tank 2 is a vertical cylinder container provided with a bottom flow hole, the upper layer of the inner cavity of the vertical cylinder container stores and controls gas phase, the lower layer of the inner cavity of the vertical cylinder container is electrolyte liquid phase communicated with the lower layer of the magnesium collecting chamber 12, and the liquid level meter 3 controls the gas charging and discharging pipe valve in real time through the intelligent controller 5 to perform stability auxiliary control on the electrolyte liquid level in the electrolytic cell 1.
The automatic continuous feeding method of the magnesium electrolytic cell is characterized in that a feeding magnesium-pumping hole and a liquid level meter are hermetically arranged on a large cover of a magnesium collecting chamber of a closed electrolytic cell, and a gas-charging and discharging pipe communicated with a submerged tank for stabilizing the liquid level of the electrolytic cell is fixedly connected downwards; the electrolytic cell is connected with an intelligent controller and at least two automatic continuous feeding devices which are overlapped in front and back and are provided with magnesium chloride liquid heat preservation ladles for continuous use, the magnesium collecting chamber is continuously fed with the at least two parallel magnesium chloride liquid heat preservation ladles in front and back, and liquid magnesium is extracted from the magnesium collecting chamber according to the requirement by the liquid magnesium heat preservation ladles while continuous feeding is carried out; a ladle gravity sensor is arranged below the magnesium chloride liquid heat preservation ladle or a ladle gravity sensor arranged beside the electrolytic cell is arranged below the magnesium chloride liquid heat preservation ladle, the upper end of the magnesium chloride liquid heat preservation ladle of a ladle exhaust pipe valve is sealed and movably connected with an automatic ladle argon filling pipe valve, a ladle gas phase pressure sensor and a sealed movable plug which are used for being in sealed plug fit with a feeding magnesium pumping hole and extending downwards to a magnesium chloride liquid feeding pipe at the bottom in the ladle, a liquid level meter, the ladle gravity sensor and the ladle gas phase pressure sensor are electrically connected with an intelligent controller, and the intelligent controller is electrically connected with a gas filling and exhausting pipe valve for controlling the ladle automatic argon filling pipe valve and the gas filling and exhausting pipe to be in extended connection; the feeding magnesium-extracting holes are at least two arranged in parallel, wherein when one of the feeding magnesium-extracting holes is used for filling magnesium chloride liquid, the other feeding magnesium-extracting holes are used for extracting liquid magnesium or used for continuously filling the magnesium chloride liquid. The method has the advantages of greatly reducing the fluctuation of electrolyte liquid level, obviously improving the production efficiency and the quality of liquid magnesium products and prolonging the service life of the electrolytic cell.
The gas charging and discharging pipe valve is a submerged tank gas discharging pipe valve and a submerged tank gas charging pipe valve which are communicated in parallel with each other through a gas charging and discharging pipe and are respectively used for gas discharging and charging of the submerged tank under the control of the intelligent controller; the ladle automatic argon filling pipe valve and the submerged tank gas filling pipe valve which are parallel to the ladle exhaust pipe valve are communicated with a pressure argon station through a pipeline; the ladle exhaust pipe valve and the submerged tank exhaust pipe valve are communicated with a tail gas treatment system through a pipeline.
The feeding magnesium-pumping hole and the ladle gravity sensor are at least two sets of parallel arranged on the large cover of the magnesium collecting chamber and beside the electrolytic bath respectively; one set of the magnesium liquid heat preservation two-man ladle is used for continuously matching with a continuous advancing magnesium chloride liquid heat preservation two-man ladle, and is additionally used for continuously matching with a continuous advancing magnesium chloride liquid heat preservation two-man ladle for charging or is used for continuously matching with a continuous advancing magnesium chloride liquid heat preservation two-man ladle, and liquid magnesium is extracted from a magnesium collection chamber when the continuous advancing magnesium chloride liquid heat preservation two-man ladle is charged.
The subsequent magnesium chloride liquid heat-preservation ladle is a pre-continuous subsequent magnesium chloride liquid heat-preservation ladle which is pre-continuously prepared when a certain magnesium chloride liquid allowance still exists in the previous magnesium chloride liquid heat-preservation ladle, and the feeding magnesium-extracting hole and the ladle gravity sensor after the feeding of the previous magnesium chloride liquid heat-preservation ladle is completed are used for being continuously matched with a liquid magnesium heat-preservation ladle which extracts liquid magnesium from the upper layer of the magnesium collecting chamber; and a liquid magnesium pumping pipe of the liquid magnesium heat-preservation ladle is downwards hermetically inserted into the feeding magnesium pumping hole and is discharged to a liquid magnesium layer of the magnesium collecting chamber to pump liquid magnesium, and the ladle gravity sensor is used for measuring the liquid magnesium pumping speed and the quantity of the liquid magnesium heat-preservation ladle in real time.
The balance of the magnesium chloride liquid is 160-240kg, preferably 200 kg. The electrolytic cell is divided into an upper liquid magnesium layer with a lower electrolyte layer in an upper magnesium collecting chamber by a vertical partition wall with the lower part transversely communicated, and a magnesium chloride liquid feeding pipe is inserted into the position 20-30 cm below the upper liquid magnesium layer. The liquid level meter and the gas charging and discharging pipe of the submerged tank are respectively and fixedly arranged on the gas charging and discharging pipe mounting hole and the liquid level meter mounting hole on the large cover of the magnesium collecting chamber in a sealing way. The intelligent controller is electrically connected with at least two sets of parallel ladle gravity sensors, the ladle gas-phase pressure sensor and the ladle automatic argon pipe filling valve and simultaneously electrically connected with one set of gas filling and discharging pipe valve; the intelligent controller is matched with a plurality of sets of magnesium chloride liquid heat preservation ladles which are alternately and continuously used in a continuous measurement and control mode.
The electrolytic cell is provided with a working condition detection device for detecting the electrolytic current and the electrolytic efficiency in real time, and the liquid level meter, the ladle gravity sensor, the ladle gas phase pressure sensor and the working condition detection device control the automatic ladle argon filling pipe valve through an intelligent controller, so that the real-time feeding speed control of the magnesium chloride liquid and the electrolyte liquid level control in the stable electrolytic cell are realized; the submerged tank is a vertical cylinder container provided with a bottom flow liquid hole, the upper layer of the inner cavity of the vertical cylinder container stores and controls a gas phase, the lower layer of the inner cavity of the vertical cylinder container is an electrolyte liquid phase communicated with the lower layer of the magnesium collecting chamber, and the liquid level meter controls the gas charging and discharging pipe valve in real time through an intelligent controller to perform stability auxiliary control on the electrolyte liquid level in the electrolytic cell.
The following is described in further detail with reference to the accompanying drawings.
As shown in FIGS. 1 and 2, the electrolytic cell 1 is divided into an electrolytic chamber 13 and a magnesium collecting chamber 12 by a vertical partition wall. The electrolytic chamber 13 has a plurality of electrolytic cells consisting of anodes 14 and cathodes 15, bipolar electrodes (not shown) are disposed between the anodes 14 and the cathodes 15 in the multi-polar magnesium electrolytic cell 1, and a chlorine gas discharge port (not shown) is provided in the large cover 131 of the electrolytic chamber. The magnesium collecting chamber 12 is provided with a submerged tank 2 and a liquid level meter 3, and the large cover 121 of the magnesium collecting chamber is provided with two charging magnesium pumping holes 16, a liquid level meter mounting hole 31 and 1 gas charging and discharging pipe mounting hole 21 of the submerged tank 2.
The automatic continuous feeding device 4 (in a dotted line frame) is composed of a magnesium chloride liquid heat-preservation ladle 41, a ladle gravity sensor 42, a magnesium chloride liquid feeding pipe 43, a ladle exhaust pipe valve 44, a ladle automatic argon filling pipe valve 45, a ladle gas phase pressure sensor 46, an intelligent controller 5 and the like.
In the production process, the magnesium chloride liquid heat preservation ladle 41 receives the magnesium chloride liquid from the reduction process of the production of the titanium sponge, and then is placed on a ladle gravity sensor 42 beside the electrolytic bath 1, and the ladle gravity sensor 42 is connected with the intelligent controller 5. The inlets and outlets at the two ends of the magnesium chloride liquid feeding pipe 43 are respectively inserted into the electrolytes of the magnesium chloride liquid heat-preservation ladle 41 and the magnesium collecting chamber 12 of the electrolytic cell, and the gaps between the magnesium chloride liquid feeding pipe 43 and the magnesium feeding and extracting holes 16 of the magnesium chloride liquid heat-preservation ladle 41 and the magnesium collecting chamber large cover 121 are sealed by flanges. The ladle automatic argon filling pipe valve 45 is respectively connected with the pressure argon gas station and the intelligent controller 5. The ladle gas phase pressure sensor 46 is connected to the intelligent controller 5.
When the automatic continuous feeding is carried out, the ladle exhaust pipe valve 44 on the magnesium chloride liquid heat preservation ladle 41 is closed, the automatic ladle argon filling pipe valve 45 is opened to fill argon into the magnesium chloride liquid heat preservation ladle 41, and the molten magnesium chloride is continuously pressed into the electrolytic bath 1. The pressure in the magnesium chloride liquid heat-preservation ladle 41 is controlled by the linkage of the ladle gas-phase pressure sensor 46 and the ladle automatic argon-filling pipe valve 45, and the feeding speed of the magnesium chloride liquid is automatically controlled by the pressure of the ladle gas-phase pressure sensor 46. In addition, the consumption speed of the magnesium chloride liquid can be jointly controlled by the liquid level change value measured by the liquid level meter 3 of the electrolytic cell 1 and the intelligent controller, so as to ensure the stable liquid level of the electrolytic cell 1. Meanwhile, the liquid level of the electrolytic bath 1 can be controlled in an auxiliary way through the pressure (namely, liquid level) control of the submerged tank 2.
In the electrolytic process, the thickness of the liquid magnesium layer in the magnesium collection chamber 12 is gradually increased, when the liquid magnesium layer reaches a certain thickness, the other feeding and magnesium-pumping hole 16 of the magnesium collection chamber 12 is opened, and the liquid magnesium is intermittently pumped by the vacuum liquid magnesium ladle and sent to the reduction process of titanium sponge production. Two charging magnesium extraction holes 16 on the large cover 121 of the magnesium collecting chamber are alternately used as the charging magnesium extraction holes 16 to ensure the continuity of charging. By adopting the novel device to organize production, in 24-month magnesium electrolysis production, the current efficiency of the electrolytic cell is averagely improved by about 3 percent, and the average N content in the liquid magnesium is reduced by 0.001 percent.
In a word, the automatic continuous feeding system and the method for the magnesium electrolytic cell have the advantages of greatly reducing the fluctuation of the electrolyte liquid level, obviously improving the production efficiency and the quality of the liquid magnesium product, prolonging the service life of the electrolytic cell and having good reliability.
Claims (10)
1. An automatic continuous feeding system of a magnesium electrolytic cell is characterized in that a magnesium collecting chamber large cover of a closed electrolytic cell is hermetically provided with a feeding magnesium-pumping hole, a liquid level meter and a gas charging and discharging pipe which is fixedly connected with a submerged tank communicated with the liquid level of the electrolytic cell downwards, the feeding magnesium-pumping hole supplies liquid magnesium for a magnesium heat-preservation ladle to pump liquid magnesium, and also supplies magnesium chloride liquid for a magnesium chloride liquid heat-preservation ladle to fill magnesium chloride liquid, the automatic continuous feeding system is characterized in that the electrolytic cell is provided with an intelligent controller and at least two automatic continuous feeding devices which are overlapped front and back and are provided with magnesium chloride liquid heat-preservation ladles for continuous use, the front and back of at least two parallel magnesium chloride liquid heat-preservation ladles are continuously fed to the magnesium collecting chamber, and liquid magnesium is extracted from the magnesium collecting chamber according to the requirements during continuous feeding; a ladle gravity sensor is arranged below the magnesium chloride liquid heat-preservation ladle or a ladle gravity sensor arranged beside the electrolytic cell is arranged below the magnesium chloride liquid heat-preservation ladle, the sealed loose joint ladle automatic argon-filling pipe valve, a ladle gas-phase pressure sensor and a sealed loose joint plug of the upper end of the magnesium chloride liquid heat-preservation ladle of the ladle exhaust pipe valve are matched with a magnesium chloride liquid charging pipe which is hermetically inserted with the charging magnesium-pumping hole and extends downwards to the bottom in the ladle, the liquid level meter, the ladle gravity sensor and the ladle gas-phase pressure sensor are electrically connected with an intelligent controller, and the intelligent controller is electrically connected with a charging exhaust pipe valve which is used for controlling the ladle automatic argon-filling pipe valve and the charging exhaust pipe to be in extended connection; the feeding magnesium-extracting holes are at least two arranged in parallel, wherein when one of the feeding magnesium-extracting holes is used for filling magnesium chloride liquid, the other feeding magnesium-extracting holes are used for extracting liquid magnesium or used for continuously filling the magnesium chloride liquid.
2. The automatic continuous feeding system of the magnesium electrolytic cell according to claim 1, wherein the gas charging and discharging pipe valves are a submerged tank gas discharging pipe valve and a submerged tank gas charging pipe valve for charging argon gas, which are respectively used for gas discharging and gas charging of the submerged tank under the control of an intelligent controller; the ladle automatic argon filling pipe valve and the submerged tank gas filling pipe valve which are parallel to the ladle exhaust pipe valve are communicated with a pressure argon station through a pipeline; the ladle exhaust pipe valve and the submerged tank exhaust pipe valve are communicated with a tail gas treatment system through a pipeline.
3. The automatic continuous feeding system of the magnesium electrolytic cell according to claim 1, characterized in that the feeding magnesium-extracting hole and the two-man ladle gravity sensor are at least two sets in parallel respectively arranged on the large cover of the magnesium collecting chamber and beside the electrolytic cell; one set of the magnesium liquid heat-preservation ladle is used for being continuously matched with a forward magnesium chloride liquid heat-preservation ladle, the other set of the magnesium liquid heat-preservation ladle is used for being continuously matched with a subsequent magnesium chloride liquid heat-preservation ladle for continuously feeding the forward magnesium chloride liquid heat-preservation ladle or is used for being continuously matched, and when the forward magnesium chloride liquid heat-preservation ladle feeds materials, the liquid magnesium heat-preservation ladle for extracting liquid magnesium from the magnesium collecting chamber.
4. The automatic continuous feeding system of the magnesium electrolytic cell according to claim 3, wherein the subsequent magnesium chloride solution heat preservation two-man ladle is a pre-prepared subsequent magnesium chloride solution heat preservation two-man ladle which is pre-prepared when a certain magnesium chloride solution surplus still exists in the previous magnesium chloride solution heat preservation two-man ladle, and the feeding magnesium extraction hole and the two-man ladle gravity sensor after the feeding of the previous magnesium chloride solution heat preservation two-man ladle is completed are used for being matched with a liquid magnesium heat preservation two-man ladle which extracts liquid magnesium from the upper layer of the magnesium collection chamber; and a liquid magnesium pumping pipe of the liquid magnesium heat-preservation ladle is downwards hermetically inserted into the feeding magnesium pumping hole and is discharged to a liquid magnesium layer of the magnesium collecting chamber to pump liquid magnesium, and a ladle gravity sensor measures the liquid magnesium pumping speed and the quantity of the liquid magnesium heat-preservation ladle in real time.
5. The automatic continuous feeding system of the magnesium electrolytic cell according to claim 1, characterized in that the electrolytic cell is provided with a working condition detection device for detecting the electrolytic current and the electrolytic efficiency in real time, and the liquid level meter, the two-man ladle gravity sensor, the two-man ladle gas phase pressure sensor and the working condition detection device control the two-man ladle automatic argon filling pipe valve through an intelligent controller, so as to realize the real-time feeding speed control of the magnesium chloride liquid and the electrolyte level control in the stable electrolytic cell; the submerged tank is a vertical cylinder container provided with a bottom flow liquid hole, the upper layer of the inner cavity of the vertical cylinder container stores and controls a gas phase, the lower layer of the inner cavity of the vertical cylinder container is an electrolyte liquid phase communicated with the lower layer of the magnesium collecting chamber, and the liquid level meter controls the gas charging and discharging pipe valve in real time through an intelligent controller to perform stability auxiliary control on the electrolyte liquid level in the electrolytic cell.
6. An automatic continuous feeding method of a magnesium electrolytic cell is characterized in that a feeding magnesium-pumping hole and a liquid level meter are hermetically arranged on a large cover of a magnesium collecting chamber of a closed electrolytic cell, and a gas charging and discharging pipe communicated with a submerged tank for stabilizing the liquid level of the electrolytic cell is fixedly connected downwards; a ladle gravity sensor is arranged below the magnesium chloride liquid heat preservation ladle or a ladle gravity sensor arranged beside the electrolytic cell is arranged below the magnesium chloride liquid heat preservation ladle, the upper end of the magnesium chloride liquid heat preservation ladle of a ladle exhaust pipe valve is sealed and movably connected with an automatic ladle argon filling pipe valve, a ladle gas phase pressure sensor and a sealed movable plug which are used for being in sealed plug fit with a feeding magnesium pumping hole and extending downwards to a magnesium chloride liquid feeding pipe at the bottom in the ladle, a liquid level meter, the ladle gravity sensor and the ladle gas phase pressure sensor are electrically connected with an intelligent controller, and the intelligent controller is electrically connected with a gas filling and exhausting pipe valve for controlling the ladle automatic argon filling pipe valve and the gas filling and exhausting pipe to be in extended connection; the feeding magnesium-extracting holes are at least two arranged in parallel, wherein when one of the feeding magnesium-extracting holes is used for filling magnesium chloride liquid, the other feeding magnesium-extracting holes are used for extracting liquid magnesium or used for continuously filling the magnesium chloride liquid.
7. The automatic continuous feeding method of the magnesium electrolytic cell according to claim 6, characterized in that the gas charging and discharging pipe valves are a submerged tank gas discharging pipe valve and a submerged tank gas charging pipe valve for charging argon gas, which are respectively used for gas discharging and gas charging of the submerged tank under the control of the intelligent controller; the ladle automatic argon filling pipe valve and the submerged tank gas filling pipe valve which are parallel to the ladle exhaust pipe valve are communicated with a pressure argon station through a pipeline; the ladle exhaust pipe valve and the submerged tank exhaust pipe valve are communicated with a tail gas treatment system through a pipeline.
8. The automatic continuous feeding method of the magnesium electrolytic cell according to claim 6, characterized in that the feeding magnesium-extracting hole and the two-man ladle gravity sensor are at least two sets in parallel respectively arranged on the large cover of the magnesium collecting chamber and beside the electrolytic cell; one set of the magnesium liquid heat-preservation ladle is used for continuously matching with a forward magnesium chloride liquid heat-preservation ladle, and the other set of the magnesium liquid heat-preservation ladle is used for continuously matching with a subsequent magnesium chloride liquid heat-preservation ladle for continuously feeding the forward magnesium chloride liquid heat-preservation ladle or is used for continuously matching with the forward magnesium chloride liquid heat-preservation ladle.
9. The automatic continuous feeding method of the magnesium electrolytic cell according to claim 8, characterized in that the subsequent magnesium chloride solution heat preservation two-man ladle is a pre-prepared subsequent magnesium chloride solution heat preservation two-man ladle which is pre-prepared when a certain magnesium chloride solution surplus still exists in the previous magnesium chloride solution heat preservation two-man ladle, and the feeding magnesium extraction hole and the two-man ladle gravity sensor after the feeding of the previous magnesium chloride solution heat preservation two-man ladle is completed are used for being matched with the liquid magnesium heat preservation two-man ladle which extracts liquid magnesium from the upper layer of the magnesium collecting chamber; and a liquid magnesium pumping pipe of the liquid magnesium heat-preservation ladle is downwards hermetically inserted into the feeding magnesium pumping hole and is discharged to a liquid magnesium layer of the magnesium collecting chamber to pump liquid magnesium, and a ladle gravity sensor measures the liquid magnesium pumping speed and the quantity of the liquid magnesium heat-preservation ladle in real time.
10. The automatic continuous feeding method of the magnesium electrolytic cell according to claim 6, characterized in that the electrolytic cell is provided with a working condition detection device for detecting the electrolytic current and the electrolytic efficiency in real time, and the liquid level meter, the two-man ladle gravity sensor, the two-man ladle gas phase pressure sensor and the working condition detection device control the two-man ladle automatic argon filling pipe valve through an intelligent controller, thereby realizing the real-time feeding speed control of the magnesium chloride liquid and the electrolyte liquid level control in the stable electrolytic cell; the submerged tank is a vertical cylinder container provided with a bottom flow liquid hole, the upper layer of the inner cavity of the vertical cylinder container stores and controls a gas phase, the lower layer of the inner cavity of the vertical cylinder container is an electrolyte liquid phase communicated with the lower layer of the magnesium collecting chamber, and the liquid level meter controls the gas charging and discharging pipe valve in real time through an intelligent controller to perform stability auxiliary control on the electrolyte liquid level in the electrolytic cell.
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| CN202210043996.9A CN114318419A (en) | 2022-01-14 | 2022-01-14 | Automatic continuous feeding system and method for magnesium electrolytic cell |
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| CN202210043996.9A CN114318419A (en) | 2022-01-14 | 2022-01-14 | Automatic continuous feeding system and method for magnesium electrolytic cell |
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