Molten magnesium chloride purification device

Abstract

The invention relates to the technical field of molten magnesium chloride purification, in particular to a molten magnesium chloride purification device which comprises an electrolytic bath, a filtering part for filtering is arranged above the electrolytic bath through a bayonet part, and the filtering part comprises a splash-proof cylinder; the bayonet part comprises a sliding counterweight ring, a sliding rail, a rolling sliding block, a stabilizing sliding block, a stabilizing rod and a movable abutting rod, and the lower end of the stabilizing rod is hinged to the lower portion of the movable abutting rod; the top of the splash-proof cylinder is rotatably connected with a top ring, a supporting rod is fixed to the lower end of the top ring, a base is arranged at the lower end of the supporting rod, an inner net and an outer net are arranged around the upper edge of the base, and a ceramic membrane filter is clamped between the inner net and the outer net. The device can be centered and fixed through the sliding counterweight ring, the sliding rail and the movable abutting rod, molten magnesium chloride can be fully filtered through the inner net, the ceramic membrane filter, the outer net and the rotatable top ring, and the ceramic filter is convenient to replace and clean; the device is adaptive to various sizes of electrolytic cells, fully and efficiently filters molten magnesium chloride, and is convenient to maintain.

Description

Technical Field

[0001] The invention relates to the technical field of molten magnesium chloride purification, in particular to a molten magnesium chloride purification device. Background Art

[0002] At present, the industrial production of titanium sponge at home and abroad adopts the method of reducing titanium tetrachloride with magnesium. Titanium tetrachloride is introduced into a closed container containing liquid magnesium to react and generate titanium sponge, and the other product, magnesium chloride, is returned to the magnesium electrolysis for recycling. One of the reasons for the decline in the efficiency of the electrolytic cell is that it is easily affected by the sediment, which makes it difficult to maintain long-term current efficiency and high efficiency, and the maintenance cost is relatively high. In the whole process of titanium sponge production, the molten magnesium chloride removed by reduction contains impurities such as Ti, Fe, Si, and O. These impurities appear as fine particles. As magnesium chloride enters the electrolytic cell, it accumulates and grows continuously, and finally settles at the bottom of the electrolytic cell, resulting in electrode passivation, thereby reducing the current efficiency. At the same time, some of these impurities will also enter the reduction stage with liquid magnesium. Although we have carried out purification and impurity removal operations in the middle, it still has more or less impact on the titanium sponge product. On the whole, these impurities cannot be excluded from the entire electrolytic reduction cycle system, and they will eventually be deposited in the electrolytic cell. Studying a method for removing impurities from magnesium chloride in a molten state and adapting to various electrolytic cells is of great significance to saving electricity and improving the quality of titanium sponge production in the whole process.

[0003] Yunnan Guoti Metal Co., Ltd. applied for a magnesium chloride filtering device with patent number 214075462U, which filters titanium slag twice through a porous plate and a bottom plate, and intercepts the titanium slag with a first interception plate and a second interception plate, effectively filtering and intercepting the titanium slag in magnesium chloride, reducing the blockage of the discharge hole, and ensuring the quality and discharge efficiency of magnesium chloride;

[0004] The molten magnesium chloride temperature is high while sponge titanium is produced, which is convenient for electrolysis, inconvenient for storage, and needs to enter the electrolyzer as soon as possible, but the interception plate in the patent is below the reactor, and its blockage is difficult to clean, the filter baffle area is small, the filtration efficiency is low, and there is a risk of continuous increase in pressure. And the molten magnesium chloride temperature is high while sponge titanium is produced, which is convenient for electrolysis, and long-term storage requires electric heating to maintain the temperature of magnesium chloride. When magnesium chloride cannot be removed due to blockage, it needs to be cooled and cleaned before replacement. In view of this, the present invention provides a molten magnesium chloride purification device. Summary of the invention

[0005] In order to overcome the defects in the prior art, the object of the present invention is to provide a molten magnesium chloride purification device to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides a molten magnesium chloride purification device, comprising an electrolytic cell, the electrolytic cell is cylindrical and open at the top, a filter part for filtering the molten magnesium chloride is suspended above the notch of the electrolytic cell through a bayonet part, the filter part comprises a cylindrical splash-proof cylinder suspended just above the bottom of the electrolytic cell;

[0007] The bayonet portion includes a sliding weight ring slidably sleeved on the outside of the splash-proof tube, a slide rail vertically fixedly arranged on the outside of the splash-proof tube, a rolling slider slidably connected to the slide rail, a stabilizing slider slidably connected to the slide rail, a stabilizing rod fixed at the lower end of the stabilizing rod, and a movable abutting rod hinged on the sliding weight ring and slidably connected to the rolling slider at the same time, the sliding weight ring is always located above the slide rail, the lower end of the stabilizing rod is hinged to the lower part of the movable abutting rod, and the rolling slider and the stabilizing slider are accompanied by rotation when sliding on the slide rail; the slide rail overlaps the top of the electrolytic cell and the lower end of the movable abutting rod abuts against the inner wall of the electrolytic cell, thereby forming a state of supporting the splash-proof tube;

[0008] The filtering part includes a top ring rotatably connected to the top of the splash-proof cylinder, a plurality of equally spaced vertical support rods fixed at the lower end of the top ring, a base fixedly arranged at the lower ends of the support rods, a plurality of vertical inner nets fixedly arranged at the upper edge of the base, an outer net hinged on the support rods, and a ceramic membrane filter sandwiched between the inner net and the outer net. The inner net and the outer net between two adjacent support rods are arranged at the same height relative to each other.

[0009] As a further improvement of the present technical solution, the bayonet parts are made of high-temperature resistant 304 stainless steel, the slide rails are in the shape of long rectangular blocks and are welded and fixed to the outside of the splash-proof cylinder at equal intervals, a slide groove with a cross-shaped cross-section is opened along the inside of the slide rail, and cylindrical hinge shafts are welded at both ends of the rolling slider and the stabilizing slider, and the two hinge shafts of the rolling slider and the stabilizing slider are slidably connected to the corresponding two side grooves of the slide groove.

[0010] As a further improvement of the technical solution, the rolling slider is cylindrical in shape, the movable abutment rod is slidably inserted at the midpoint of the axis of the rolling slider, the length of the movable abutment rod is greater than the length of the slide rail, the stabilizing slider is always located directly above the lower end of the movable abutment rod, and a rough surface for abutting against the inner wall of the electrolytic cell is provided on the lower end surface of the movable abutment rod.

[0011] As a further improvement of the technical solution, limiting protrusions for limiting the ceramic membrane filter sheets are welded and fixed on both sides of the support rod corresponding to the top ends of the two adjacent ceramic membrane filter sheets.

[0012] As a further improvement of the technical solution, at least four support rods are provided, the base is a conical shape with a sharp top and a thick bottom for guiding the molten magnesium chloride to pass through the ceramic membrane filter, and the horizontal cross-section of the base is always a regular polygon corresponding to the number of support rods.

[0013] As a further improvement of the present technical solution, the base includes a horizontal convex edge extending outward from its lower end, the inner net and the outer net are both rectangular and evenly provided with a number of square mesh openings, the lower edge of the inner net is welded and fixed to the inner edge of the horizontal convex edge, and the left and right edges of the inner net are welded and fixed between the corresponding two adjacent support rods.

[0014] As a further improvement of the present technical solution, the outer net is located at the outer edge of the horizontal convex edge, and an insertion rod is welded and fixed along the upper end of one of the side edges of the outer net. The insertion rod is in an inverted U-shape, and the U-shaped end away from the outer net slides vertically downward and is inserted into the top of the corresponding support rod. A fixing rod is welded and fixed along the upper end of the other side edge of the outer net for fixing to the top of the corresponding support rod by bolts.

[0015] As a further improvement of the present technical solution, the ceramic membrane filter is in an I-shape and a number of circular holes for filtering are evenly opened in sections thereof; the two side sections of the ceramic membrane filter perpendicular to the middle section are symmetrical to each other and their lengths are equal to the distance between the inner net and the outer net; the top of the splash-proof tube is at least 5 cm higher than the upper edges of the inner net, the ceramic membrane filter and the outer net; the bottom surface of the base is at a level greater than or equal to the bottom surface of the slide rail; the length of the splash-proof tube below the slide rail is less than the depth of the electrolytic cell.

[0016] As a further improvement of the technical solution, the filter part also includes a driving mechanism for driving the top ring to rotate, the driving mechanism includes a carrier seat fixed to the outside of the electrolytic cell by bolts, a heightening column welded and fixed to the top surface of the carrier seat, a rotating motor fixed to the top of the heightening column by bolts, a rotating rod coaxially connected to the output shaft of the rotating motor, and a worm coaxially connected to the rotating rod;

[0017] A turbine ring is rotatably connected to the top end of the splash-proof cylinder, at least three circumferential sliders are fixed to the inside of the turbine ring at equal intervals by bolts, all of the circumferential sliders are slidably connected to the edge of the cylinder mouth of the splash-proof cylinder, all of the circumferential sliders are fixed to the outside of the top ring at equal intervals by bolts, the turbine ring is fixedly installed on the outside of the circumferential sliders by bolts, the turbine ring is located directly above the splash-proof cylinder, and the turbine ring is meshed with the worm.

[0018] As a further improvement of the technical solution, at least three L-shaped rods are fixedly installed on the outside of the splash shield by bolts, and the same inverted truncated cone-shaped funnel is fixedly installed on the upper ends of all the L-shaped rods by bolts. The funnel is located above the turbine ring and the top ring, the funnel is pointed at the bottom and thick at the top, and the inner diameter of the lower end is smaller than the inner diameter of the top ring, and the inner radius of the top ring is smaller than the radius of the inscribed circle of the base, the L-shaped rod does not contact the turbine ring and the circumferential slider, and the splash shield, the turbine ring, the top ring, the base and the funnel are all coaxially arranged.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The molten magnesium chloride purification device, through the sliding counterweight ring, slide rail, rolling slider, stable slider, stable rod and movable abutment rod in the bayonet part, enables that after the filter device is placed in the electrolytic cell, the counterweight ring forces the rolling slider and the stable slider to slide in the slide rail due to the decrease of gravity, and at the same time, the movable abutment rod inserted therein is opened to the outside and abuts against the inner wall of the electrolytic cell as it rotates, thereby realizing that the purification device can be adaptively fixed on electrolytic cells of various calibers.

[0021] 2. The molten magnesium chloride purification device, through the anti-splash cylinder, top ring, support rod, base, inner net, outer net, ceramic membrane filter and driving mechanism in the filter part, allows the molten magnesium chloride liquid to rotate and be filtered out through centrifugal force after entering the filter part, and the filtered molten magnesium chloride flows into the electrolytic cell through the edge of the base or the inner wall of the anti-splash cylinder. The ceramic membrane filter is made of ceramic material and can filter smaller particle impurities and is resistant to high temperature; the material of the inner net and the outer net is 304 stainless steel, which is also resistant to high temperature and can filter larger impurities. The ceramic membrane filter is also fixed by the inner net and the outer net, so that the ceramic membrane filter is easy to replace or clean, and the filtration efficiency is guaranteed while filtering fine impurity particles, thereby increasing the efficiency of obtaining magnesium element by electrolysis and the service life of the electrolytic cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the figures are only schematic, used to help understand the present invention, and are not specifically limited to the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to the teachings of the present invention.

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the local structure of the present invention;

[0025] Figure 3 This is one of the schematic diagrams of the local explosion structure in the present invention;

[0026] Figure 4 It is a schematic diagram of the explosion structure of the filter part in the present invention;

[0027] Figure 5 It is a structural schematic diagram of the driving mechanism in the present invention;

[0028] Figure 6 It is a schematic diagram of the overall longitudinal section structure of the present invention;

[0029] Figure 7 It is a structural schematic diagram of the base in the present invention;

[0030] Figure 8 This is the second schematic diagram of the local explosion structure in the present invention;

[0031] Fig. 9 For the present invention Figure 8 A partial enlarged view of the middle A;

[0032] Fig.10 It is a partial structural schematic diagram of the external network in the present invention;

[0033] The meaning of each number in the figure is:

[0034] 1. Electrolyzer;

[0035] 2. Bayonet portion; 20. Sliding weight ring; 21. Slide rail; 210. Rolling slider; 211. Stabilizing slider; 2110. Stabilizing rod; 22. Movable stop rod;

[0036] 3. Filtering part; 30. Splash-proof cylinder; 301. L-shaped rod; 302. Funnel; 31. Driving mechanism; 310. Carrier seat; 311. Heightening column; 312. Rotating motor; 313. Rotating rod; 314. Worm; 32. Turbine ring; 320. Circumferential slider; 33. Top ring; 34. Support rod; 341. Limiting protrusion; 35. Base; 350. Horizontal convex edge; 36. Inner net; 37. Outer net; 370. Insert rod; 371. Fixing rod; 38. Ceramic membrane filter. DETAILED DESCRIPTION

[0037] The details of the present invention can be more clearly understood by combining the accompanying drawings with the description of the specific embodiments of the present invention. However, the specific embodiments of the present invention described herein are only used for the purpose of explaining the present invention and cannot be understood as limiting the present invention in any way. Under the guidance of the present invention, technicians can conceive of any possible variations based on the present invention, which should be regarded as falling within the scope of the present invention. The terms "installation" and "connection" should be understood in a broad sense, which can be directly connected or indirectly connected through an intermediate medium.

[0038] The terms "central axis", "vertical", "horizontal", "front", "back", "up", "down", "left", "right", "top", "bottom", "inside", "outside" and the like used herein to indicate positions or positional relationships are based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the equipment or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, in the description of the present invention, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.

[0039] See also Figure 1-Figure 10 As shown, the present invention provides a molten magnesium chloride purification device, comprising an electrolytic cell 1, the electrolytic cell 1 is cylindrical and open at the top, a filter part 3 for filtering the molten magnesium chloride is suspended above the notch of the electrolytic cell 1 through a bayonet part 2, and the filter part 3 includes a cylindrical splash-proof cylinder 30 suspended above the bottom of the electrolytic cell 1;

[0040] The bayonet portion 2 includes a sliding weight ring 20 slidably sleeved on the outside of the splash-proof tube 30, a slide rail 21 vertically fixedly arranged on the outside of the splash-proof tube 30, a rolling slider 210 slidably connected to the slide rail 21, a stabilizing slider 211 slidably connected to the slide rail 21, a stabilizing rod 2110 fixed to the lower end of the stabilizing slider 211, and a movable abutting rod 22 hinged on the sliding weight ring 20 and slidably connected to the rolling slider 210 at the same time. The sliding weight ring 20 is always located above the slide rail 21, and the lower end of the stabilizing rod 2110 is hinged to the lower part of the movable abutting rod 22. When the rolling slider 210 and the stabilizing slider 211 slide on the slide rail 21, they are accompanied by rotation; the slide rail 21 overlaps the top of the electrolytic cell 1 and the lower end of the movable abutting rod 22 abuts against the inner wall of the electrolytic cell 1, thereby forming a state of supporting the splash-proof tube 30;

[0041] The filter part 3 includes a top ring 33 rotatably connected to the top of the splash-proof cylinder 30, a plurality of support rods 34 fixed vertically at the lower end of the top ring 33 at equal intervals, a base 35 fixedly arranged at the lower ends of the plurality of support rods 34, a plurality of inner nets 36 fixed vertically at the upper edge of the base 35, an outer net 37 hinged on the support rods 34, and a ceramic membrane filter sheet 38 sandwiched between the inner net 36 and the outer net 37. The inner net 36 and the outer net 37 between two adjacent support rods 34 are arranged at the same height relative to each other.

[0042] Specifically, the bayonet portion 2 is made of high-temperature resistant 304 stainless steel, the slide rail 21 is in the shape of a long rectangular block and is welded and fixed at equal intervals on the outside of the splashproof cylinder 30, a slide groove with a cross-shaped cross-section is opened along the inside of the slide rail 21, and cylindrical hinge shafts are welded at both ends of the rolling slider 210 and the stabilizing slider 211. The two hinge shafts of the rolling slider 210 and the stabilizing slider 211 are slidably connected to the corresponding two side grooves of the slide groove, thereby allowing the movable support rod 22 to be along its hinge and against the inner wall of the electrolytic cell 1.

[0043] Specifically, the rolling slider 210 is cylindrical in shape, and the movable abutment 22 is slidably inserted at the midpoint of the axis of the rolling slider 210. The length of the movable abutment 22 is greater than the length of the slide rail 21. The stabilizing slider 211 is always located directly above the lower end of the movable abutment 22, so that the stabilizing slider 211 and the stabilizing rod 2110 can move synchronously with the movable abutment 22 and contact the inner wall of the electrolytic cell 1 at the same time. A rough surface for abutting against the inner wall of the electrolytic cell 1 is provided on the lower end surface of the movable abutment 22.

[0044] Secondly, limiting protrusions 341 for limiting the ceramic membrane filter 38 are welded and fixed on both sides of the top of the two adjacent ceramic membrane filter sheets 38 of the support rod 34. When the ceramic membrane filter sheet 38 is placed between the inner net 36 and the outer net 37, the bottom surface of the limiting protrusion 341 can contact the upper surface of the ceramic membrane filter sheet 38 to limit the position.

[0045] Preferably, at least four support rods 34 are provided, and the base 35 is in a conical shape with a sharp top and a thick bottom for guiding the molten magnesium chloride to pass through the ceramic membrane filter 38, and the horizontal cross-section of the base 35 is always a regular polygon corresponding to the number of support rods 34, thereby guiding the molten magnesium chloride to be filtered downward from the bottom edge of the base 35 by means of centrifugal force and slope.

[0046] Furthermore, the base 35 includes a horizontal flange 350 extending outward from its lower end. The inner net 36 and the outer net 37 are both rectangular and evenly provided with a number of square mesh openings to filter larger solid impurities. The lower edge of the inner net 36 is welded and fixed to the inner edge of the horizontal flange 350, and the left and right edges of the inner net 36 are welded and fixed between the corresponding two adjacent support rods 34.

[0047] Specifically, the outer net 37 is located at the outer edge of the horizontal flange 350, and an insertion rod 370 is welded and fixed along the upper end of one side of the outer net 37. The insertion rod 370 is in an inverted U-shape, and the U-shaped end away from the outer net 37 slides vertically downward and is inserted into the top of the corresponding support rod 34, so that the outer net 37 can be rotated along the insertion point of the insertion rod 370 and the entire outer net 37 can be pulled out at this point. A fixing rod 371 is welded and fixed along the upper end of the other side of the outer net 37 for fixing to the top of the corresponding support rod 34 by bolts.

[0048] Specifically, Figure 8 The middle ceramic membrane filter 38 is in an I-shape and a number of circular holes for filtering are evenly opened in the middle section with a diameter of 10ppi-30ppi. The two side sections of the ceramic membrane filter 38 and the middle section are symmetrical to each other and the length is equal to the distance between the inner net 36 and the outer net 37; the horizontal height of the top of the splash-proof cylinder 30 is at least 5cm higher than the horizontal height of the upper edges of the inner net 36, the ceramic membrane filter 38 and the outer net 37, so as to ensure that when the ceramic membrane filter 38 in the lower part is completely blocked, the molten magnesium chloride overflowing from the upper edge of the ceramic membrane filter 38 can still be in the splash-proof cylinder 30 and flow into the electrolytic cell 1, the horizontal height of the bottom surface of the base 35 is greater than or equal to the horizontal height of the bottom surface of the slide rail 21, and the length of the part of the splash-proof cylinder 30 below the slide rail 21 is less than the depth of the electrolytic cell 1, so that part of the space is reserved between the splash-proof cylinder 30 and the bottom of the electrolytic cell 1, so that the filtered molten magnesium chloride can participate in the electrolysis.

[0049] In addition, the filter unit 3 also includes a driving mechanism 31 for driving the top ring 33 to rotate, and the driving mechanism 31 includes a carrier seat 310 fixed to the outside of the electrolytic cell 1 by bolts, a heightening column 311 welded and fixed to the top surface of the carrier seat 310, a rotating motor 312 fixed to the top of the heightening column 311 by bolts, a rotating rod 313 coaxially connected to the output shaft of the rotating motor 312, and a worm 314 coaxially connected to the rotating rod 313;

[0050] A turbine ring 32 is rotatably connected to the top end of the splash-proof cylinder 30. At least three circumferential sliders 320 are fixed to the inside of the turbine ring 32 at equal intervals by bolts. All the circumferential sliders 320 are slidably connected to the edge of the cylinder mouth of the splash-proof cylinder 30. All the circumferential sliders 320 are fixed to the outside of the top ring 33 at equal intervals by bolts. The turbine ring 32 is fixedly installed on the outside of the circumferential sliders 320 by bolts. The turbine ring 32 is located directly above the splash-proof cylinder 30. The turbine ring 32 is meshed with the worm 314 so that the rotating motor 312 can drive the turbine ring 32 to rotate, driving the top ring 33, the base 35, the inner net 36, the outer net 37 and the ceramic membrane filter 38 to rotate along the axis of the turbine ring 32, so that the molten magnesium chloride obtains centrifugal force to be filtered outward.

[0051] Specifically, at least three L-shaped rods 301 are fixed on the outside of the splash shield 30 by bolts, and the same inverted truncated cone-shaped funnel 302 is fixed on the upper end of all the L-shaped rods 301 by bolts to facilitate the input of molten magnesium chloride. The funnel 302 is located above the turbine ring 32 and the top ring 33. The funnel 302 is pointed at the bottom and thick at the top, and the inner diameter of the lower end is smaller than the inner diameter of the top ring 33. The inner radius of the top ring 33 is smaller than the radius of the inscribed circle of the base 35. The L-shaped rod 301 does not contact the turbine ring 32 and the circumferential slider 320. The splash shield 30, turbine ring 32, top ring 33, base 35 and funnel 302 are all coaxially arranged.

[0052] The working principle of the present invention is as follows: the device is lifted by a crane and placed roughly at the center of the electrolytic cell 1, and it is ensured that the sliding counterweight ring 20 rises to the point where the movable support rod 22 can enter the electrolytic cell 1, the filtering device is slowly lowered, and the sliding counterweight ring 20 is released at the same time to descend with gravity, the slide rail 21 descends to contact the notch of the electrolytic cell 1, and the sliding counterweight ring 20 drives the movable support rod 22 to open outward and press against the inner wall of the electrolytic cell 1 at the upper part; then, the rotating motor 312 is started to drive the turbine ring 32 to rotate, driving the top ring 33, the base 35, the inner net 36, the outer net 37 and the ceramic membrane filter 38 to rotate along the axis of the turbine ring 32, so that the molten magnesium chloride obtains centrifugal force to filter outward, and finally enters the electrolytic cell 1, and electrolysis starts at the same time.

[0053] In addition, it should be noted that the components involved in the present invention, such as the electrolytic cell 1, the rotating motor 312 and the supporting controller, are all universal standard parts or components known to those skilled in the art, and their structures and principles are known to those skilled in the art through technical manuals or conventional experimental methods. In the idle space of the device, all the above-mentioned electrical components, which refer to power elements, electrical components, and adapted controllers and power supplies, are connected through wires. The specific connection means should refer to the working principle of the present invention. The electrical connections between the electrical components are completed in a sequential working order, and the detailed connection means are all well-known technologies in the art.

[0054] Finally, it should be noted that the above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A molten magnesium chloride purification device, comprising an electrolytic cell (1), characterized in that: The electrolytic cell (1) is cylindrical and open at the top. A filter portion (3) for filtering molten magnesium chloride is suspended above the notch of the electrolytic cell (1) through a bayonet portion (2). The filter portion (3) comprises a cylindrical splash-proof cylinder (30) suspended just above the bottom of the electrolytic cell (1). The bayonet portion (2) comprises a sliding counterweight ring (20) slidably sleeved on the outside of the splash shield (30), a slide rail (21) vertically fixedly arranged on the outside of the splash shield (30), a rolling slider (210) slidably connected to the slide rail (21), a stabilizing slider (211) slidably connected to the slide rail (21), a stabilizing rod (2110) fixed at the lower end of the stabilizing slider (211), a sliding counterweight ring (20) hinged on the sliding counterweight ring (20) and slidably connected to the rolling slider (211), and a sliding rod (2110) hinged on the sliding counterweight ring (20) and slidably connected to the rolling slider (211). 0), the sliding weight ring (20) is always located above the slide rail (21), the lower end of the stabilizing rod (2110) is hinged to the lower part of the movable push rod (22), and the rolling slider (210) and the stabilizing slider (211) are accompanied by rotation when sliding on the slide rail (21); the slide rail (21) is overlapped with the top of the electrolytic cell (1) and the lower end of the movable push rod (22) is in contact with the inner wall of the electrolytic cell (1), thereby forming a state of supporting the splash guard (30); The filtering part (3) comprises a top ring (33) rotatably connected to the top of the anti-splash cylinder (30), a plurality of support rods (34) fixed vertically at the lower end of the top ring (33) at equal intervals, a base (35) fixedly arranged at the lower ends of the plurality of support rods (34), a plurality of inner nets (36) fixedly arranged vertically at the upper edge of the base (35), an outer net (37) hinged on the support rods (34), and a ceramic membrane filter (38) sandwiched between the inner net (36) and the outer net (37), wherein the inner net (36) and the outer net (37) between two adjacent support rods (34) are arranged at equal heights relative to each other.

2. The molten magnesium chloride purification device according to claim 1, characterized in that: The bayonet portion (2) is made of high-temperature resistant 304 stainless steel. The slide rail (21) is in the shape of a long rectangular block and is welded and fixed at equal intervals to the outside of the splash-proof tube (30). A slide groove with a cross-shaped cross section is provided along the inside of the slide rail (21). Both ends of the rolling slider (210) and the stabilizing slider (211) are welded with cylindrical hinge shafts. The two hinge shafts of the rolling slider (210) and the stabilizing slider (211) are slidably connected to the corresponding two side grooves of the slide groove.

3. The molten magnesium chloride purification device according to claim 1, characterized in that: The rolling slider (210) is cylindrical in shape, the movable abutment rod (22) is slidably inserted at the midpoint of the axis of the rolling slider (210), the length of the movable abutment rod (22) is greater than the length of the slide rail (21), the stabilizing slider (211) is always located directly above the lower end of the movable abutment rod (22), and a rough surface for abutting against the inner wall of the electrolytic cell (1) is provided on the lower end surface of the movable abutment rod (22).

4. The molten magnesium chloride purification device according to claim 1, characterized in that: Limiting protrusions (341) for limiting the position of the ceramic membrane filter sheets (38) are welded and fixed on both sides of the support rod (34) corresponding to the top ends of the two adjacent ceramic membrane filter sheets (38).

5. The molten magnesium chloride purification device according to claim 1, characterized in that: At least four support rods (34) are provided, and the base (35) is in a conical shape with a sharp top and a thick bottom for guiding molten magnesium chloride to pass through the ceramic membrane filter (38), and the horizontal cross-section of the base (35) is always a regular polygon corresponding to the number of support rods (34).

6. The molten magnesium chloride purification device according to claim 5, characterized in that: The base (35) includes a horizontal convex edge (350) extending outward from the lower end thereof; the inner net (36) and the outer net (37) are both rectangular and evenly provided with a plurality of square net openings; the lower edge of the inner net (36) is welded and fixed to the inner edge of the horizontal convex edge (350); and the left and right edges of the inner net (36) are welded and fixed between two corresponding adjacent support rods (34).

7. The molten magnesium chloride purification device according to claim 6, characterized in that: The outer net (37) is located at the outer edge of the horizontal convex edge (350), and an insertion rod (370) is welded and fixed along the upper end of one side of the outer net (37). The insertion rod (370) is in an inverted U shape, and the U-shaped end away from the outer net (37) slides vertically downward and is inserted into the top of the corresponding support rod (34). A fixing rod (371) is welded and fixed along the upper end of the other side of the outer net (37) and is used to be fixed to the top of the corresponding support rod (34) by bolts.

8. The molten magnesium chloride purification device according to claim 1, characterized in that: The ceramic membrane filter (38) is in an I-shape and has a plurality of circular holes for filtering evenly formed in sections therein; the two side sections of the ceramic membrane filter (38) perpendicular to the middle section are symmetrical to each other and have a length equal to the distance between the inner net (36) and the outer net (37); the top of the splash-proof tube (30) is at least 5 cm higher than the upper edges of the inner net (36), the ceramic membrane filter (38) and the outer net (37); the bottom surface of the base (35) is at a level greater than or equal to the bottom surface of the slide rail (21); and the length of the portion of the splash-proof tube (30) below the slide rail (21) is less than the depth of the electrolytic cell (1).

9. The molten magnesium chloride purification device according to claim 1, characterized in that: The filter portion (3) further comprises a driving mechanism (31) for driving the top ring (33) to rotate, the driving mechanism (31) comprising a carrier seat (310) fixed to the outside of the electrolytic cell (1) by bolts, a heightening column (311) welded and fixed to the top surface of the carrier seat (310), a rotating motor (312) fixed to the top of the heightening column (311) by bolts, a rotating rod (313) coaxially connected to the output shaft of the rotating motor (312), and a worm (314) coaxially connected to the rotating rod (313); A turbine ring (32) is rotatably connected to the top end of the splash-proof cylinder (30), and at least three circumferential sliders (320) are fixed to the inside of the turbine ring (32) at equal intervals by bolts. All of the circumferential sliders (320) are slidably connected to the edge of the cylinder mouth of the splash-proof cylinder (30), and all of the circumferential sliders (320) are fixed to the outside of the top ring (33) at equal intervals by bolts. The turbine ring (32) is fixedly installed on the outside of the circumferential sliders (320) by bolts. The turbine ring (32) is located directly above the splash-proof cylinder (30), and the turbine ring (32) is meshed with the worm (314).

10. The molten magnesium chloride purification device according to claim 9, characterized in that: At least three L-shaped rods (301) are fixedly installed on the outside of the splash shield (30) by bolts, and the upper ends of all the L-shaped rods (301) are fixedly installed with the same inverted truncated cone-shaped funnel (302) by bolts. The funnel (302) is located above the turbine ring (32) and the top ring (33). The funnel (302) is pointed at the bottom and thick at the top, and the inner diameter of its lower end is smaller than the inner diameter of the top ring (33). The inner radius of the top ring (33) is smaller than the radius of the inscribed circle of the base (35). The L-shaped rod (301) does not contact the turbine ring (32) and the circumferential slider (320). The splash shield (30), the turbine ring (32), the top ring (33), the base (35) and the funnel (302) are all coaxially arranged.

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