Automatic continuous feeding system and method for magnesium electrolytic cell

Abstract

The present invention relates to an automatic continuous feeding system and method for a magnesium electrolytic cell. In order to solve the problem of electrolyte level fluctuation, the electrolytic cell is provided with a feeding and magnesium extraction hole, a liquid level gauge and a submerged tank. The electrolytic cell is equipped with an automatic continuous feeding device including an intelligent controller and a plurality of connected magnesium chloride liquid insulation lifting bags; a lifting bag gravity sensor is arranged below the lifting bag, and a sealing joint at the upper end of the lifting bag is used to seal and plug the lifting bag automatic argon filling pipe valve and a gas phase pressure sensor and a sealing joint plug-in for the magnesium chloride liquid feeding pipe extending to the bottom of the lifting bag, and the liquid level gauge, the gravity sensor and the gas phase pressure sensor are electrically connected to the intelligent controller to control the automatic argon filling pipe valve and the filling and exhaust pipe valve connected to the filling and exhaust pipe; the two feeding and magnesium extraction holes are respectively used to add magnesium chloride liquid and extract liquid magnesium or to add magnesium chloride liquid continuously. It has the advantages of greatly reducing electrolyte level fluctuation, significantly improving production efficiency and liquid magnesium product quality, and extending the life of the electrolytic cell, and having good reliability.

Description

Technical Field

[0001] The invention relates to a magnesium electrolytic cell feeding device, in particular to an automatic continuous feeding system and method for a magnesium electrolytic cell. Background Art

[0002] At present, in the electrolysis of magnesium chloride to produce metallic magnesium and chlorine, especially in the industrial production using multi-electrode electrolytic cells, the electrolyte is mostly a ternary electrolyte of MgCl2, NaCl and CaCl2 for electrolytic production. The feeding method of magnesium chloride is to use a magnesium chloride ladle to intermittently and quickly add molten magnesium chloride to the magnesium collecting chamber of the electrolytic cell, such as: 6 to 8 times a day, each time adding about 2 tons, and each time adding time about 3 minutes. This feeding method has the following shortcomings: (1) The MgCl2 content in the electrolyte components in the electrolytic cell varies between 16% and 23%, making the electrolysis process unstable; (2) Rapid feeding causes the slag (mainly magnesium oxides, nitrides and corroded refractory brick particles) deposited at the bottom of the magnesium collection chamber to be rolled up and enter the electrolytic chamber with the circulation of the electrolyte, adhering to the electrode surface to cause electrode passivation; (3) Rapid feeding causes the electrolytic cell liquid level to fluctuate too much, which on the one hand will cause air to be sucked in from the feeding port, causing oxidation and nitridation loss of liquid magnesium on the surface of the magnesium collection chamber, and on the other hand may also cause the electrolytic chamber to form a current short circuit due to excessive liquid level. The existing feeding method mentioned above has the disadvantages of reduced current efficiency of the electrolytic cell, reduced production efficiency, rapid corrosion of the graphite anode, and high impurity content in the produced liquid magnesium. Summary of the invention

[0003] The purpose of the present invention is to overcome the above-mentioned defects of the prior art and provide an automatic continuous feeding system for a magnesium electrolytic cell which can greatly reduce electrolyte level fluctuations, significantly improve production efficiency and liquid magnesium product quality and extend the life of the electrolytic cell. The present invention also provides an automatic continuous feeding method for a magnesium electrolytic cell implemented on the system.

[0004] To achieve the above-mentioned purpose, the automatic continuous feeding system of the magnesium electrolytic cell of the present invention is a magnesium collecting chamber of the sealed electrolytic cell with a large cover sealed with a feeding and drawing hole and a liquid level gauge and a filling and exhaust pipe fixedly connected downwardly to a submerged tank for stabilizing the liquid level of the electrolytic cell. The feeding and drawing hole is used to draw liquid magnesium from a liquid magnesium insulation ladle and also to fill a magnesium chloride liquid insulation ladle with magnesium chloride liquid. The electrolytic cell is equipped with an automatic continuous feeding device including an intelligent controller and at least two magnesium chloride liquid insulation ladle arranged in a front-to-back manner for continuous use, and at least two parallel magnesium chloride liquid insulation ladle are used to feed the magnesium collecting chamber in a front-to-back manner. While continuously feeding, the liquid magnesium insulation ladle extracts liquid magnesium from the magnesium collecting chamber as needed; the bottom of the magnesium chloride liquid insulation ladle is provided with an automatic continuous feeding device including an intelligent controller and at least two magnesium chloride liquid insulation ladles arranged in a front-to-back manner for continuous use. A ladle gravity sensor is provided or a ladle gravity sensor is provided under the magnesium chloride liquid insulation ladle beside the electrolytic cell, a magnesium chloride liquid insulation ladle with a ladle exhaust pipe valve, a sealing joint at the upper end of the ladle automatic argon filling pipe valve, a ladle gas phase pressure sensor, and a sealing joint plug-in for sealing and plugging with the feeding and magnesium extraction hole, and a magnesium chloride liquid feeding pipe extending to the bottom of the ladle, a liquid level meter, a ladle gravity sensor, and a ladle gas phase pressure sensor are electrically connected to an intelligent controller, and the intelligent controller is electrically connected to control the ladle automatic argon filling pipe valve and the filling and exhaust pipe extension valve; the feeding and magnesium extraction holes are at least two arranged in parallel, one of which is used for filling magnesium chloride liquid, and the other is used to extract liquid magnesium or for continuous filling of magnesium chloride liquid. It has the advantages of greatly reducing electrolyte level fluctuations, significantly improving production efficiency and liquid magnesium product quality, and extending the life of the electrolytic cell.

[0005] As an optimization, the filling and exhaust pipe valve is a submersible tank exhaust pipe valve connected in parallel with the filling and exhaust pipes and a submersible tank inflation pipe valve for filling with argon, which are respectively used for exhausting and inflating the submersible tank under the control of an intelligent controller; the ladle automatic argon filling pipe valve and the submersible tank inflation pipe valve parallel to the ladle exhaust pipe valve are connected to the pressure argon station through pipelines; the ladle exhaust pipe valve and the submersible tank exhaust pipe valve are connected to the exhaust gas treatment system through pipelines.

[0006] As an optimization, the feeding and magnesium extraction holes and the lifting bag gravity sensors are at least two sets arranged in parallel on the large cover of the magnesium collecting chamber and next to the electrolytic cell respectively; one set is used to connect the preceding magnesium chloride liquid insulation lifting bag, and the other set is used to connect the subsequent magnesium chloride liquid insulation lifting bag that is continuously fed with the preceding magnesium chloride liquid insulation lifting bag or to connect the liquid magnesium insulation lifting bag that extracts liquid magnesium from the magnesium collecting chamber when the preceding magnesium chloride liquid insulation lifting bag is fed.

[0007] As an optimization, the subsequent magnesium chloride liquid insulation ladle is a pre-connected subsequent magnesium chloride liquid insulation ladle that is pre-connected when a certain amount of magnesium chloride liquid remains in the preceding magnesium chloride liquid insulation ladle; the feeding and magnesium extraction hole and the ladle gravity sensor are used to connect a liquid magnesium insulation ladle for extracting liquid magnesium from the upper layer of the magnesium collecting chamber after the preceding magnesium chloride liquid insulation ladle is finished feeding and removed; the liquid magnesium extraction tube of the liquid magnesium insulation ladle is sealed downwardly inserted into the feeding and magnesium extraction hole to the liquid magnesium layer of the magnesium collecting chamber to extract liquid magnesium; the ladle gravity sensor is used to measure the extraction speed and amount of liquid magnesium of the liquid magnesium insulation ladle in real time.

[0008] The residual amount of the magnesium chloride liquid is 160-240kg, preferably 200kg. The electrolytic cell is separated by a vertical partition wall that is horizontally connected at the lower part to form an upper magnesium collecting chamber with an upper liquid magnesium layer having a lower electrolyte layer, and the magnesium chloride liquid feeding pipe is inserted 20 to 30cm below the upper liquid magnesium layer. The filling and exhaust pipes of the liquid level gauge and the submersible tank are respectively sealed and fixed on the filling and exhaust pipe mounting holes and the liquid level gauge mounting holes on the large cover of the magnesium collecting chamber. The intelligent controller is electrically connected to at least two sets of parallel ladle gravity sensors, the ladle gas phase pressure sensor and the ladle automatic argon filling pipe valve, and electrically controls a set of filling and exhaust pipe valves; the intelligent controller is equipped with a plurality of sets of magnesium chloride liquid insulation ladle that are used alternately.

[0009] As an optimization, the electrolytic cell is provided with a working condition detection device for real-time detection of the electrolysis current and the electrolysis efficiency. The liquid level meter, the ladle gravity sensor, the ladle gas phase pressure sensor and the working condition detection device control the ladle automatic argon filling pipe valve through an intelligent controller to achieve real-time feeding speed control of the magnesium chloride solution and stable electrolyte level control in the electrolytic cell; the submersible tank is a vertical cylindrical container with a bottom liquid flow hole. The upper layer of the inner cavity of the vertical cylindrical container stores and regulates the gas phase, and the lower layer is the electrolyte liquid phase connected to the lower layer of the magnesium collecting chamber. The liquid level meter controls the filling and exhaust pipe valve in real time through the intelligent controller to assist in stability regulation of the electrolyte level in the electrolytic cell.

[0010] The invention discloses an automatic continuous feeding method for a magnesium electrolytic cell. The invention discloses a method for sealing and discharging a feeding and drawing magnesium hole and a liquid level meter on a large cover of a magnesium collecting chamber of a sealed electrolytic cell, and a charging and exhaust pipe which is fixedly connected downwardly to a submerged tank for stabilizing the liquid level of the electrolytic cell. The feeding and drawing magnesium hole is used for a liquid magnesium insulation lifting bag to extract liquid magnesium, and is also used for a magnesium chloride liquid insulation lifting bag to add magnesium chloride liquid. The invention is special in that the electrolytic cell is equipped with an automatic continuous feeding device including an intelligent controller and at least two magnesium chloride liquid insulation lifting bags which are arranged in a front-to-back manner and are used in succession. At least two parallel magnesium chloride liquid insulation lifting bags are used to feed the magnesium collecting chamber in succession. During the continuous feeding, the liquid magnesium insulation lifting bag extracts liquid magnesium from the magnesium collecting chamber as required. A lifting bag is arranged below the magnesium chloride liquid insulation lifting bag. The gravity sensor of the bag or the gravity sensor of the magnesium chloride liquid insulation bag is arranged next to the electrolytic cell, the upper end of the magnesium chloride liquid insulation bag equipped with the bag exhaust pipe valve is sealed and connected with the automatic argon filling pipe valve of the bag and the gas phase pressure sensor of the bag and the sealed joint is used to seal and plug with the feeding and extraction hole of magnesium, and the magnesium chloride liquid feeding pipe extending to the bottom of the bag, the level meter and the gravity sensor of the bag and the gas phase pressure sensor of the bag are electrically connected to the intelligent controller, and the intelligent controller is electrically connected to control the automatic argon filling pipe valve of the bag and the filling and exhaust pipe valve extended by the filling and exhaust pipe; the feeding and extraction holes of magnesium are at least two arranged in parallel, one of which is used for filling magnesium chloride liquid, and the other is used for extracting liquid magnesium or for continuing to fill magnesium chloride liquid. It has the advantages of greatly reducing the fluctuation of electrolyte level, significantly improving production efficiency and liquid magnesium product quality and extending the life of the electrolytic cell.

[0011] As an optimization, the filling and exhaust pipe valve is a submersible tank exhaust pipe valve connected in parallel with the filling and exhaust pipes and a submersible tank inflation pipe valve for filling with argon, which are respectively used for exhausting and inflating the submersible tank under the control of an intelligent controller; the ladle automatic argon filling pipe valve and the submersible tank inflation pipe valve parallel to the ladle exhaust pipe valve are connected to the pressure argon station through pipelines; the ladle exhaust pipe valve and the submersible tank exhaust pipe valve are connected to the exhaust gas treatment system through pipelines.

[0012] As an optimization, the feeding and magnesium extraction holes and the lifting bag gravity sensors are at least two sets arranged in parallel on the large cover of the magnesium collecting chamber and next to the electrolytic cell respectively; one set is used to connect the preceding magnesium chloride liquid insulation lifting bag, and the other set is used to connect the subsequent magnesium chloride liquid insulation lifting bag that is continuously fed with the preceding magnesium chloride liquid insulation lifting bag or to connect the liquid magnesium insulation lifting bag that extracts liquid magnesium from the magnesium collecting chamber when the preceding magnesium chloride liquid insulation lifting bag is fed.

[0013] As an optimization, the subsequent magnesium chloride liquid insulation ladle is a pre-connected subsequent magnesium chloride liquid insulation ladle that is pre-connected when a certain amount of magnesium chloride liquid remains in the preceding magnesium chloride liquid insulation ladle; the feeding and magnesium extraction hole and the ladle gravity sensor are used to connect a liquid magnesium insulation ladle for extracting liquid magnesium from the upper layer of the magnesium collecting chamber after the preceding magnesium chloride liquid insulation ladle is finished feeding and removed; the liquid magnesium extraction tube of the liquid magnesium insulation ladle is sealed downwardly inserted into the feeding and magnesium extraction hole and reaches the liquid magnesium layer in the magnesium collecting chamber to extract liquid magnesium; the ladle gravity sensor is used to measure the extraction speed and amount of liquid magnesium of the liquid magnesium insulation ladle in real time.

[0014] The residual amount of the magnesium chloride liquid is 160-240kg, preferably 200kg. The electrolytic cell is separated by a vertical partition wall that is horizontally connected at the lower part to form an upper magnesium layer with a lower electrolyte layer in the upper magnesium collecting chamber, and the magnesium chloride liquid feeding pipe is inserted 20 to 30cm below the upper liquid magnesium layer. The filling and exhaust pipes of the liquid level gauge and the submersible tank are respectively sealed and fixed on the filling and exhaust pipe mounting holes and the liquid level gauge mounting holes on the large cover of the magnesium collecting chamber. The intelligent controller is electrically connected to at least two sets of parallel lifting bag gravity sensors, the lifting bag gas phase pressure sensor and the lifting bag automatic argon filling pipe valve, and electrically controls a set of filling and exhaust pipe valves; the intelligent controller is equipped with measurement and control of multiple sets of magnesium chloride liquid insulation lifting bags that are used alternately and continuously.

[0015] As an optimization, the electrolytic cell is provided with a working condition detection device for real-time detection of the electrolysis current and the electrolysis efficiency. The liquid level meter, the ladle gravity sensor, the ladle gas phase pressure sensor and the working condition detection device control the ladle automatic argon filling pipe valve through an intelligent controller to achieve real-time feeding speed control of the magnesium chloride solution and stable electrolyte level control in the electrolytic cell; the submersible tank is a vertical cylindrical container with a bottom liquid flow hole. The upper layer of the inner cavity of the vertical cylindrical container stores and regulates the gas phase, and the lower layer is the electrolyte liquid phase connected to the lower layer of the magnesium collecting chamber. The liquid level meter controls the filling and exhaust pipe valve in real time through the intelligent controller to assist in stability regulation of the electrolyte level in the electrolytic cell.

[0016] The method and system of the invention mainly consist of a magnesium chloride insulation ladle, a magnesium chloride liquid feeding pipe, an automatic argon filling pipe valve for the ladle, an exhaust pipe valve for the ladle, a gas phase pressure sensor for the ladle, a gravity sensor for the ladle and an intelligent controller.

[0017] Two feeding and extracting holes are set on the large cover of the magnesium collecting chamber of the electrolytic cell for continuous feeding and extraction of liquid magnesium. Two magnesium chloride insulation lifting bags are used, both placed next to the electrolytic cell, one for continuous feeding and the other for receiving molten magnesium chloride from the reduction process of sponge titanium production. During the production process, the two magnesium chloride insulation lifting bags and the two feeding and extracting holes are used in rotation.

[0018] The magnesium chloride insulation ladle receives molten magnesium chloride from the reduction process of sponge titanium production, and is transported to the magnesium electrolysis process and placed on the ladle gravity sensor next to the electrolytic cell. The outlet end of the magnesium chloride feeding tube is inserted into the electrolyte from a feeding and magnesium extraction hole in the electrolytic cell. The insertion depth of the feeding tube is 20 to 30 cm below the liquid magnesium layer. At the same time, the inlet end of the magnesium chloride liquid feeding tube is inserted into the magnesium chloride insulation ladle. The ladle argon filling pipe valve on the magnesium chloride insulation ladle is connected to the argon system, and the ladle gravity sensor, ladle gas phase pressure sensor and ladle automatic argon filling pipe valve are electrically connected to the intelligent controller.

[0019] When the exhaust valve of the magnesium chloride ladle is closed, argon gas is injected into the ladle to continuously press the magnesium chloride liquid therein into the electrolytic cell. The speed at which the magnesium chloride liquid is discharged from the ladle is related to the gas phase pressure in the ladle, and the gas phase pressure in the ladle is set by feedback of the gravity reduction signal fed back by the ladle gravity sensor. The gas phase pressure in the ladle is achieved by interlocking control of the ladle gas phase pressure sensor and the ladle automatic argon filling pipe valve. In addition, the feeding speed control value of the magnesium chloride liquid is determined by the size of the direct current and the current efficiency of the electrolytic cell, and the feeding speed of the magnesium chloride can also be controlled according to the liquid level change of the electrolytic cell.

[0020] Before the feeding of magnesium chloride liquid in the ladle of an automatic feeding system is almost finished, if there is about 200kg of magnesium chloride liquid left in the ladle, another automatic continuous feeding device is organized at another feeding and magnesium extraction hole of the electrolytic cell to realize the continuous feeding operation of stopping the former and feeding the latter in time. The feeding pipe of the magnesium chloride liquid that has stopped feeding is removed from the feeding port of the electrolytic cell, and the feeding port is used for the extraction of liquid magnesium. After removing the magnesium chloride liquid feeding pipe and other connecting systems related to the magnesium chloride ladle, the magnesium chloride ladle is sent to the reduction process of sponge titanium production to receive molten magnesium chloride for rotation use.

[0021] Advantages and effects of the present invention: 1. The automatic continuous feeding device of the present invention is used to achieve the stability of the electrolyte components in the electrolysis process of magnesium chloride, so that the electrolysis production process is stable and the production efficiency is improved. 2. The automatic continuous feeding device of the present invention is used to greatly reduce the fluctuation of the electrolyte level in the electrolytic cell, improve the current efficiency and production efficiency of the electrolytic cell, and improve the quality of the liquid magnesium product. 3. The automatic continuous feeding device of the present invention is used to effectively prevent the slag at the bottom of the electrolytic cell from rolling up and entering the electrolyte, prolong the life of the graphite anode, and improve the current efficiency and production efficiency of the electrolytic cell.

[0022] After adopting the above technical scheme, the automatic continuous feeding system and method of the magnesium electrolytic cell of the present invention has the advantages of greatly reducing electrolyte level fluctuation, significantly improving production efficiency and liquid magnesium product quality, extending the life of the electrolytic cell, and having good reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the automatic continuous feeding system of the magnesium electrolytic cell of the present invention; Figure 2 The invention is a schematic diagram of the top view of the electrolytic cell of the automatic continuous feeding system of the magnesium electrolytic cell. The numbers in the figure are: 1 electrolytic cell, 11 vertical partition wall, 12 magnesium collecting chamber, 121 magnesium collecting chamber cover, 13 electrolytic chamber, 131 electrolytic chamber cover, 14 anode, 15 cathode, 16 feeding and extracting magnesium hole, 2 submerged tank, 21 filling and exhaust pipe installation hole, 211 submerged tank exhaust pipe valve, 212 submerged tank filling pipe valve, 3 liquid level meter, 31 liquid level meter installation hole, 41 magnesium chloride liquid insulation lifting bag, 44 lifting bag exhaust pipe valve, 45 lifting bag automatic argon filling pipe valve, 46 lifting bag gas phase pressure sensor, 43 magnesium chloride liquid feeding pipe, 5 intelligent controller, 42 lifting bag gravity sensor, 4 automatic continuous feeding device, 20 filling and exhaust pipe. DETAILED DESCRIPTION

[0024] As shown in the figure, the automatic continuous feeding system of the magnesium electrolytic cell of the present invention is a magnesium collecting chamber cover 121 of the sealed electrolytic cell 1, which is sealed with a feeding and drawing hole 16 and a liquid level meter 3 and a filling and exhaust pipe 20 fixedly connected downward to the submerged tank 2 for stabilizing the liquid level of the electrolytic cell 1, the feeding and drawing hole 16 is used for the liquid magnesium insulation lifting bag to extract liquid magnesium, and is also used for the magnesium chloride liquid insulation lifting bag 41 to add magnesium chloride liquid; the electrolytic cell 1 is equipped with an intelligent controller 5 and an automatic continuous feeding device 4 including at least two magnesium chloride liquid insulation lifting bags 41 which are stacked and used successively, and at least two parallel magnesium chloride liquid insulation lifting bags 41 are used to feed the magnesium collecting chamber 12 successively, and the liquid magnesium insulation lifting bag extracts liquid magnesium from the magnesium collecting chamber 12 as needed during the continuous feeding; the magnesium chloride liquid insulation lifting bag 41 is arranged below the electrolytic cell 1 The ladle gravity sensor 42 beside the ladle can also be a ladle gravity sensor set under the magnesium chloride liquid insulation ladle; the upper end of the magnesium chloride liquid insulation ladle 41 equipped with the ladle exhaust pipe valve 44 is sealed and connected to the ladle automatic argon filling pipe valve 45 and the ladle gas phase pressure sensor 46 and the sealed joint plug-in is used to seal and plug with the feeding and magnesium extraction hole 16, and the magnesium chloride liquid feeding pipe 43 extending to the bottom of the ladle, the liquid level meter 3 and the ladle gravity sensor 42 and the ladle gas phase pressure sensor 46 are electrically connected to the intelligent controller 5, and the intelligent controller 5 is electrically connected to control the ladle automatic argon filling pipe valve 45 and the filling and exhaust pipe valve extended by the filling and exhaust pipe 20; the feeding and magnesium extraction hole 16 is at least two arranged in parallel, one of which is used for filling magnesium chloride liquid, and the other is used to extract liquid magnesium or for continuous filling of magnesium chloride liquid. It has the advantages of greatly reducing the fluctuation of electrolyte level, significantly improving production efficiency and liquid magnesium product quality and extending the life of the electrolytic cell.

[0025] The said charging and exhaust pipe valves are the submerged tank exhaust pipe valve 211 connected in parallel with the charging and exhaust pipe 20 and the submerged tank charging pipe valve 212 for charging argon, which are respectively used for exhausting and charging the submerged tank 2 under the control of the intelligent controller 5; the ladle automatic argon charging pipe valve 45 and the submerged tank charging pipe valve 212 connected in parallel with the ladle exhaust pipe valve 44 are connected to the argon station through pipelines. The ladle exhaust pipe valve 44 and the submerged tank exhaust pipe valve 211 are connected to the tail gas treatment system through pipelines.

[0026] The magnesium feeding and extraction holes 16 and the ladle gravity sensors 42 are at least two sets arranged in parallel on the magnesium collecting chamber cover 121 and beside the electrolytic cell 1, respectively; one set is used to connect the preceding magnesium chloride liquid insulation ladle 41, and the other set is used to connect the subsequent magnesium chloride liquid insulation ladle 41 that is fed with the preceding magnesium chloride liquid insulation ladle 41, or to connect the liquid magnesium insulation ladle that extracts liquid magnesium from the magnesium collecting chamber 12 when the preceding magnesium chloride liquid insulation ladle 41 is fed. The subsequent magnesium chloride liquid insulation ladle 41 is a pre-connected subsequent magnesium chloride liquid insulation ladle that is pre-connected when there is still a certain amount of magnesium chloride liquid remaining in the preceding magnesium chloride liquid insulation ladle 41. The feeding and magnesium extraction hole 16 and the ladle gravity sensor 42 are used to connect the liquid magnesium insulation ladle that extracts liquid magnesium from the upper layer of the magnesium collecting chamber 12 after the preceding magnesium chloride liquid insulation ladle 41 is removed after the feeding is completed. The liquid magnesium extraction tube of the liquid magnesium insulation ladle is sealed downwardly inserted into the feeding and magnesium extraction hole and reaches the liquid magnesium layer of the magnesium collecting chamber to extract liquid magnesium. The ladle gravity sensor is used to measure the extraction speed and quantity of the liquid magnesium insulation ladle in real time. The residual amount of magnesium chloride liquid is 160-240kg, preferably 200kg.

[0027] The electrolytic cell 1 is separated by a lower horizontally connected vertical partition wall 11 into an upper magnesium collecting chamber 12 with an upper liquid magnesium layer having a lower electrolyte layer, and a magnesium chloride liquid feeding pipe 43 is inserted 20 to 30 cm below the upper liquid magnesium layer. The liquid level meter 3 and the filling and exhaust pipe 20 of the submerged tank 2 are respectively sealed and fixedly arranged on the filling and exhaust pipe mounting hole 21 and the liquid level meter mounting hole 31 on the large cover 121 of the magnesium collecting chamber. The intelligent controller 5 is electrically connected to 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 electrically controls a set of filling and exhaust pipe valves; the intelligent controller 5 is equipped with measurement and control of two sets of magnesium chloride liquid insulation ladle 41 used alternately.

[0028] The electrolytic cell 1 is provided with a working condition detection device for real-time detection of the electrolysis current and the electrolysis efficiency. 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 ladle automatic argon filling pipe valve 45 through the intelligent controller 5 to achieve real-time feeding speed control of the magnesium chloride solution and stable electrolyte level control in the electrolytic cell; the submerged tank 2 is a vertical cylindrical container with a bottom liquid flow hole. The upper layer of the inner cavity of the vertical cylindrical container stores and regulates the gas phase, and the lower layer is the electrolyte liquid phase connected to the lower layer of the magnesium collecting chamber 12. The liquid level meter 3 controls the filling and exhaust pipe valve in real time through the intelligent controller 5 to assist in stability regulation of the electrolyte level in the electrolytic cell 1.

[0029] The invention discloses an automatic continuous feeding method for a magnesium electrolytic cell. The invention discloses a method for sealing and discharging a magnesium feeding and drawing hole and a liquid level gauge on a large cover of a magnesium collecting chamber of a sealed electrolytic cell, and a charging and exhaust pipe connected downwardly to a submerged tank for stabilizing the liquid level of the electrolytic cell. The magnesium feeding and drawing hole is used for a liquid magnesium insulation ladle to draw liquid magnesium, and is also used for a magnesium chloride liquid insulation ladle to add magnesium chloride liquid. The electrolytic cell is equipped with an automatic continuous feeding device including an intelligent controller and at least two magnesium chloride liquid insulation ladle arranged in a front-to-back manner for continuous use. At least two parallel magnesium chloride liquid insulation ladle are used to feed the magnesium collecting chamber in a front-to-back manner. During the continuous feeding, the liquid magnesium insulation ladle is used to draw liquid magnesium from the magnesium collecting chamber as required. A ladle gravity sensor is arranged below the magnesium chloride liquid insulation ladle. Sensor or magnesium chloride liquid insulation ladle is equipped with a ladle gravity sensor set beside the electrolytic cell, the upper end of the magnesium chloride liquid insulation ladle equipped with the ladle exhaust pipe valve is sealed and jointed with the ladle automatic argon filling pipe valve and the ladle gas phase pressure sensor and the sealed joint plug-in are used to seal and plug with the feeding and magnesium extraction hole, and the magnesium chloride liquid feeding pipe extending to the bottom of the ladle, the liquid level meter and the ladle gravity sensor and the ladle gas phase pressure sensor are electrically connected to the intelligent controller, and the intelligent controller is electrically connected to control the ladle automatic argon filling pipe valve and the filling and exhaust pipe extension valve; the feeding and magnesium extraction holes are at least two arranged in parallel, one of which is used to add magnesium chloride liquid, and the other is used to extract liquid magnesium or to continue to add magnesium chloride liquid. It has the advantages of greatly reducing the fluctuation of electrolyte level, significantly improving production efficiency and liquid magnesium product quality and extending the life of the electrolytic cell.

[0030] The charging and exhaust pipe valves include a submersible tank exhaust pipe valve and a submersible tank inflation pipe valve for filling argon gas, which are connected in parallel with the charging and exhaust pipes and are respectively used for exhausting and inflating the submersible tank under the control of an intelligent controller; the ladle automatic argon filling pipe valve and the submersible tank inflation pipe valve, which are connected in parallel with the ladle exhaust pipe valve, are connected to a pressure argon gas station through pipelines; the ladle exhaust pipe valve and the submersible tank exhaust pipe valve are connected to an exhaust gas treatment system through pipelines.

[0031] The magnesium feeding and extraction holes and the ladle gravity sensors are at least two sets arranged in parallel on the large cover of the magnesium collecting chamber and next to the electrolytic cell respectively; one set is used for connecting the preceding magnesium chloride liquid insulation ladle, and the other set is used for connecting the subsequent magnesium chloride liquid insulation ladle that is fed with the preceding magnesium chloride liquid insulation ladle or for connecting the liquid magnesium insulation ladle that extracts liquid magnesium from the magnesium collecting chamber when the preceding magnesium chloride liquid insulation ladle is fed.

[0032] The subsequent magnesium chloride liquid insulation ladle is a pre-connected subsequent magnesium chloride liquid insulation ladle that is pre-connected when a certain amount of magnesium chloride liquid remains in the preceding magnesium chloride liquid insulation ladle; the feeding and magnesium extraction hole and the ladle gravity sensor are used to connect a liquid magnesium insulation ladle that extracts liquid magnesium from the upper layer of the magnesium collecting chamber after the preceding magnesium chloride liquid insulation ladle is removed after the feeding is completed; the liquid magnesium extraction tube of the liquid magnesium insulation ladle is sealed downwardly inserted into the feeding and magnesium extraction hole and reaches the liquid magnesium layer of the magnesium collecting chamber to extract liquid magnesium; the ladle gravity sensor is used to measure the extraction speed and amount of the liquid magnesium insulation ladle in real time.

[0033] The residual amount of the magnesium chloride liquid is 160-240kg, preferably 200kg. The electrolytic cell is separated by a vertical partition wall that is horizontally connected at the lower part to form an upper magnesium layer with a lower electrolyte layer in the upper magnesium collecting chamber, and the magnesium chloride liquid feeding pipe is inserted 20 to 30cm below the upper liquid magnesium layer. The filling and exhaust pipes of the liquid level gauge and the submersible tank are respectively sealed and fixed on the filling and exhaust pipe mounting holes and the liquid level gauge mounting holes on the large cover of the magnesium collecting chamber. The intelligent controller is electrically connected to at least two sets of parallel lifting bag gravity sensors, the lifting bag gas phase pressure sensor and the lifting bag automatic argon filling pipe valve, and electrically controls a set of filling and exhaust pipe valves; the intelligent controller is equipped with measurement and control of multiple sets of magnesium chloride liquid insulation lifting bags that are used alternately and continuously.

[0034] The electrolytic cell is provided with a working condition detection device for real-time detection of the electrolysis current and the electrolysis efficiency. The liquid level meter, the ladle gravity sensor, the ladle gas phase pressure sensor and the working condition detection device control the ladle automatic argon filling pipe valve through an intelligent controller to achieve real-time feeding speed control of magnesium chloride liquid and stable electrolyte liquid level control in the electrolytic cell; the submerged tank is a vertical cylindrical container with a bottom liquid flow hole, the upper layer of the vertical cylindrical container cavity stores and regulates the gas phase, and the lower layer is the electrolyte liquid phase connected to the lower layer of the magnesium collecting chamber. The liquid level meter controls the filling and exhaust pipe valve in real time through the intelligent controller to assist in stability regulation of the electrolyte liquid level in the electrolytic cell.

[0035] The following is a further detailed description with reference to the accompanying drawings.

[0036] like Figure 1 and Figure 2As shown, 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 an electrolytic unit composed of multiple groups of anodes 14 and cathodes 15. For the multipolar magnesium electrolytic cell 1, a bipolar electrode (not shown) is arranged between the anode 14 and the cathode 15, and a chlorine gas outlet (not shown) is arranged on the electrolytic chamber cover 131. The magnesium collecting chamber 12 has a submersible tank 2 and a liquid level meter 3. The magnesium collecting chamber cover 121 is provided with two feeding and magnesium extraction holes 16, a liquid level meter installation hole 31, and a filling and exhaust pipe installation hole 21 of the submersible tank 2.

[0037] The automatic continuous feeding device 4 (in the dotted frame) is composed of a magnesium chloride liquid insulation 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 and an intelligent controller 5.

[0038] During the production process, the magnesium chloride liquid insulation ladle 41 receives the magnesium chloride liquid from the reduction process of the sponge titanium production, and is placed on the ladle gravity sensor 42 next to the electrolytic cell 1, and the ladle gravity sensor 42 is connected to the intelligent controller 5. The inlet and outlet at both ends of the magnesium chloride liquid feeding pipe 43 are respectively inserted into the electrolyte of the magnesium chloride liquid insulation ladle 41 and the magnesium collecting chamber 12 of the electrolytic cell, and the magnesium chloride liquid feeding pipe 43 and the magnesium chloride liquid insulation ladle 41 and the feeding and magnesium extraction hole 16 of the large cover 121 of the magnesium collecting chamber are sealed with flanges. The ladle automatic argon filling pipe valve 45 is connected to the pressure argon gas station and the intelligent controller 5 respectively. The ladle gas phase pressure sensor 46 is connected to the intelligent controller 5.

[0039] When performing automatic continuous feeding, first close the ladle exhaust pipe valve 44 on the magnesium chloride liquid insulation ladle 41, open the ladle automatic argon filling pipe valve 45 to fill argon into the magnesium chloride liquid insulation ladle 41, wherein the molten magnesium chloride is continuously pressed into the electrolyzer 1. The pressure in the magnesium chloride liquid insulation ladle 41 is controlled by 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 rate of the magnesium chloride liquid can be jointly controlled by the liquid level change value measured by the liquid level meter 3 of the electrolyzer 1 and the intelligent controller to ensure that the liquid level of the electrolyzer 1 is stable. At the same time, the liquid level of the electrolyzer 1 can also be assisted by the pressure (i.e. liquid level) control of the submerged tank 2.

[0040] During the electrolysis process, the thickness of the liquid magnesium layer in the magnesium collecting chamber 12 gradually increases. When the liquid magnesium layer reaches a certain thickness, another feeding and extracting magnesium hole 16 of the magnesium collecting chamber 12 is opened, and the liquid magnesium is intermittently extracted through the vacuum liquid magnesium lifting bag and sent to the reduction process of sponge titanium production. The two feeding and extracting magnesium holes 16 on the large cover 121 of the magnesium collecting chamber are used alternately as feeding and extracting magnesium holes 16 to ensure continuous feeding. The new device is used to organize production. In 24 months of magnesium electrolysis production, the current efficiency of the electrolytic cell has increased by an average of about 3%, and the average N content in the liquid magnesium has decreased by 0.001%.

[0041] In summary, the automatic continuous feeding system and method for the magnesium electrolytic cell of the present invention has the advantages of greatly reducing electrolyte level fluctuations, significantly improving production efficiency and liquid magnesium product quality, extending the life of the electrolytic cell, and having good reliability.

Claims

1. A method for automatically and continuously feeding a magnesium electrolytic cell, wherein a feeding and drawing hole and a liquid level gauge are sealed on a large cover of a magnesium collecting chamber of a closed electrolytic cell, and a charging and exhaust pipe connected downwardly to a submerged tank for stabilizing the liquid level of the electrolytic cell is fixedly connected, the feeding and drawing hole is used to draw liquid magnesium from a liquid magnesium insulation ladle, and is also used to fill a magnesium chloride liquid insulation ladle with magnesium chloride liquid, characterized in that The electrolytic cell is equipped with an intelligent controller and an automatic continuous feeding device for at least two magnesium chloride liquid insulation lifting bags which are stacked and used in succession. At least two parallel magnesium chloride liquid insulation lifting bags are used to feed the magnesium collecting chamber in succession. During the continuous feeding, the liquid magnesium insulation lifting bag extracts liquid magnesium from the magnesium collecting chamber as required; a lifting bag gravity sensor is arranged under the magnesium chloride liquid insulation lifting bag or a lifting bag gravity sensor is arranged beside the electrolytic cell under the magnesium chloride liquid insulation lifting bag, and a lifting bag automatic argon filling pipe valve and a lifting bag gas phase pressure sensor and a sealed joint are provided at the upper end of the magnesium chloride liquid insulation lifting bag equipped with a lifting bag exhaust pipe valve for connecting with the lifting bag. The feeding and extracting magnesium holes are sealed and plugged, and the magnesium chloride liquid feeding pipe is extended to the bottom of the ladle. The liquid level meter, the ladle gravity sensor and the ladle gas phase pressure sensor are electrically connected to the intelligent controller, and the intelligent controller is electrically connected to control the automatic argon filling pipe valve of the ladle and the filling and exhaust pipe valve extended by the filling and exhaust pipe; the feeding and extracting magnesium holes are at least two arranged in parallel, one of which is used for filling magnesium chloride liquid, and the other is used for extracting liquid magnesium or for continuing to fill magnesium chloride liquid; the electrolytic cell is separated by a vertical partition wall that is horizontally connected at the lower part to form an upper magnesium collecting chamber with a lower electrolyte layer, and the magnesium chloride liquid feeding pipe is inserted 20 to 30 cm below the upper liquid magnesium layer; The electrolytic cell is provided with a working condition detection device for real-time detection of the electrolysis current and the electrolysis efficiency. The liquid level meter, the ladle gravity sensor, the ladle gas phase pressure sensor and the working condition detection device control the ladle automatic argon filling pipe valve through an intelligent controller to achieve real-time feeding speed control of magnesium chloride liquid and stable electrolyte liquid level control in the electrolytic cell; the submerged tank is a vertical cylindrical container with a bottom liquid flow hole, the upper layer of the vertical cylindrical container cavity stores and regulates the gas phase, and the lower layer is the electrolyte liquid phase connected to the lower layer of the magnesium collecting chamber. The liquid level meter controls the filling and exhaust pipe valve in real time through the intelligent controller to assist in stability regulation of the electrolyte liquid level in the electrolytic cell.

2. The method for automatically and continuously feeding magnesium electrolytic cells according to claim 1, characterized in that The charging and exhaust pipe valves include a submersible tank exhaust pipe valve and a submersible tank inflation pipe valve for filling argon gas, which are connected in parallel with the charging and exhaust pipes and are respectively used for exhausting and inflating the submersible tank under the control of an intelligent controller; the ladle automatic argon filling pipe valve and the submersible tank inflation pipe valve, which are connected in parallel with the ladle exhaust pipe valve, are connected to a pressure argon gas station through pipelines; the ladle exhaust pipe valve and the submersible tank exhaust pipe valve are connected to an exhaust gas treatment system through pipelines.

3. The method for automatically and continuously feeding magnesium electrolytic cell according to claim 1, characterized in that The magnesium feeding and extraction holes and the lifting bag gravity sensors are at least two sets arranged in parallel on the large cover of the magnesium collecting chamber and next to the electrolytic cell respectively; one set is used to connect the preceding magnesium chloride liquid insulation lifting bag, and the other set is used to connect the subsequent magnesium chloride liquid insulation lifting bag that is fed with the preceding magnesium chloride liquid insulation lifting bag or to connect the liquid magnesium insulation lifting bag that extracts liquid magnesium from the magnesium collecting chamber when the preceding magnesium chloride liquid insulation lifting bag is fed.

4. The method for automatically and continuously feeding magnesium electrolytic cell according to claim 3, characterized in that The subsequent magnesium chloride liquid insulation ladle is a pre-connected subsequent magnesium chloride liquid insulation ladle that is pre-connected when a certain amount of magnesium chloride liquid remains in the preceding magnesium chloride liquid insulation ladle; the feeding and magnesium extraction hole and the ladle gravity sensor are used to connect a liquid magnesium insulation ladle that extracts liquid magnesium from the upper layer of the magnesium collecting chamber after the preceding magnesium chloride liquid insulation ladle is removed after the feeding is completed; the liquid magnesium extraction tube of the liquid magnesium insulation ladle is sealed downwardly inserted into the feeding and magnesium extraction hole and reaches the liquid magnesium layer of the magnesium collecting chamber to extract liquid magnesium; the ladle gravity sensor measures the extraction speed and amount of liquid magnesium of the liquid magnesium insulation ladle in real time.

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