CN113029071B - Device and method for accurately measuring thickness and liquid level of magnesium in magnesium electrolytic cell - Google Patents
Device and method for accurately measuring thickness and liquid level of magnesium in magnesium electrolytic cell Download PDFInfo
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- CN113029071B CN113029071B CN202110141392.3A CN202110141392A CN113029071B CN 113029071 B CN113029071 B CN 113029071B CN 202110141392 A CN202110141392 A CN 202110141392A CN 113029071 B CN113029071 B CN 113029071B
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- 239000011777 magnesium Substances 0.000 title claims abstract description 107
- 229910052749 magnesium Inorganic materials 0.000 title claims abstract description 99
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 title claims abstract description 98
- 239000007788 liquid Substances 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 14
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims abstract description 75
- 229910001629 magnesium chloride Inorganic materials 0.000 claims abstract description 37
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 12
- 229910052786 argon Inorganic materials 0.000 claims description 6
- 239000011521 glass Substances 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 6
- 239000000853 adhesive Substances 0.000 claims description 5
- 230000001070 adhesive effect Effects 0.000 claims description 5
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 4
- 239000003792 electrolyte Substances 0.000 abstract description 6
- 238000005868 electrolysis reaction Methods 0.000 abstract description 5
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 3
- 235000017491 Bambusa tulda Nutrition 0.000 description 3
- 241001330002 Bambuseae Species 0.000 description 3
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 3
- 239000011425 bamboo Substances 0.000 description 3
- 230000005587 bubbling Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000003039 volatile agent Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
- G01B21/08—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness for measuring thickness
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/284—Electromagnetic waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/284—Electromagnetic waves
- G01F23/292—Light, e.g. infrared or ultraviolet
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a device and a method for accurately measuring the thickness and the liquid level of magnesium in a magnesium electrolytic cell, belonging to the technical field of magnesium electrolysis. Solves the problem that the thickness and the liquid level of a magnesium layer in a magnesium electrolytic cell can not be conveniently and quickly measured in the prior art. The magnesium-based electrolytic cell comprises a first measuring cylinder (2) and a second measuring cylinder (5) which are arranged on an electrolytic cell shell (8), wherein both the first measuring cylinder (2) and the second measuring cylinder (5) are provided with a distance measuring device (1), the lower end of the first measuring cylinder (2) is positioned above a magnesium layer (9), and the lower end of the second measuring cylinder (5) is positioned in magnesium chloride (10) below the magnesium layer (9). The liquid level of the magnesium layer can be directly measured by the distance measuring device, the thickness of the magnesium layer can be calculated by comparing the difference between the measured values of the two distance measuring devices through the difference between the density of electrolyte (magnesium chloride) and the density of magnesium, and the method is convenient and quick and has high measuring precision.
Description
Technical Field
The invention belongs to the technical field of magnesium electrolysis, and particularly relates to a device and a method for accurately measuring the thickness and the liquid level of magnesium in a magnesium electrolytic cell.
Background
The fused salt magnesium electrolysis production process is one of two metal magnesium production processes. A plurality of magnesium electrolytic tanks are connected in series with direct current, magnesium chloride contained in molten salt (electrolyte) in the magnesium electrolytic tanks is subjected to electrolytic reaction to generate metal magnesium and chlorine, and the magnesium is in a liquid drop shape and finally gathered together to float on the surface of the electrolyte. The liquid level of the fusant in the magnesium electrolytic cell is an important parameter for the operation of the magnesium electrolysis process, and whether the liquid level of the fusant can be kept stable has great influence on the electrolysis current efficiency and the like.
In the prior art, the liquid level detection method used in the electrolytic magnesium mainly adopts a bubbling liquid level meter, the measuring range value of the bubbling liquid level meter is narrow, the precision of the bubbling liquid level meter is linearly reduced after the value exceeds a certain range, and a device and a method for automatically measuring the thickness of the magnesium layer are lacked in the electrolytic magnesium technology, so that the thickness and the liquid level of the magnesium layer in a magnesium electrolytic cell cannot be conveniently and quickly measured.
Disclosure of Invention
Aiming at the problem that the thickness and the liquid level of a magnesium layer in a magnesium electrolytic tank cannot be conveniently and quickly measured in the prior art, the invention provides a device and a method for accurately measuring the thickness and the liquid level of magnesium in the magnesium electrolytic tank, and the purpose is as follows: the thickness and the liquid level of a magnesium layer in the magnesium electrolytic cell can be conveniently and rapidly measured.
The technical scheme adopted by the invention is as follows:
the device for accurately measuring the thickness and the liquid level of magnesium in the magnesium electrolytic cell comprises a first measuring cylinder and a second measuring cylinder which are arranged on a shell of the electrolytic cell, wherein distance measuring devices are arranged on the first measuring cylinder and the second measuring cylinder, the lower end of the first measuring cylinder is positioned above a magnesium layer, and the lower end of the second measuring cylinder is positioned in magnesium chloride below the magnesium layer.
After the technical scheme is adopted, the liquid level of the magnesium layer can be directly measured through the distance measuring devices, the thickness of the magnesium layer can be calculated by comparing the difference of the measured values of the two distance measuring devices through the difference of the density of electrolyte (magnesium chloride) and the density of magnesium, the method is convenient and fast, and the measuring precision is high.
Preferably, the distance measuring device is a laser range finder or a radar range finder.
Preferably, the distance measuring device is movably connected with the first measuring cylinder and the second measuring cylinder, the distance measuring device is connected with a support, and the support is fixedly connected with the ground.
After the preferred scheme is adopted, the influence of the deformation of the electrolytic cell shell on the test result can be avoided.
Preferably, the first measuring cylinder and the second measuring cylinder are double-layer sleeves, and a silicate inorganic adhesive is arranged between the two sleeves.
After the preferred scheme is adopted, the corrosion resistance of the measuring cylinder can be improved.
Preferably, the upper ends of the first measuring cylinder and the second measuring cylinder are closed, the lower ends of the first measuring cylinder and the second measuring cylinder are opened, and the closed ends adopt high-temperature-resistant double-layer glass.
After adopting this preferred scheme, the upper end seals and can prevent magnesium and air contact, adopts double-deck high temperature resistant glass can not influence range unit's normal work simultaneously.
Preferably, a first pipeline is arranged between the first measuring cylinder and the second measuring cylinder, the second measuring cylinder is connected with a second pipeline, argon is introduced into the second pipeline, and a first valve and a second valve are respectively arranged on the first pipeline and the second pipeline.
After adopting this preferred scheme, adopt the argon gas to sweep to measuring a section of thick bamboo inside, can avoid the volatile matter to disturb, when having magnesium in the second measurement section of thick bamboo simultaneously, can close first valve, open the second valve and discharge liquid magnesium, avoid measuring result error to appear, improve measurement accuracy.
A method for accurately measuring the thickness and the liquid level of magnesium in a magnesium electrolytic cell adopts the device and comprises the following steps:
s1: measuring the distance L1 from the distance measuring device to the liquid level of the magnesium layer through the distance measuring device and the first measuring cylinder, and measuring the distance L2 from the distance measuring device to the liquid level of magnesium chloride in the second measuring cylinder through the distance measuring device and the second measuring cylinder;
s2: the thickness of the magnesium layer is calculated from L1, L2 and the relationship between the liquid pressure and the density.
The specific steps of calculating the thickness of the magnesium layer in the step S2 are as follows:
s21: the relationship of H1 to H2 is calculated from the relationship of liquid pressure to density and depth:
P3=P1+H1×g×ρ Mg
P4=P2+H2×g×ρ MgCl2
P1=P2
P3=P4
in the formula, H1 is the thickness of the magnesium layer, P1 is the pressure of the surface of the magnesium layer, P2 is the pressure of the surface of magnesium chloride in the second measuring cylinder, P3 is the pressure of the junction of the magnesium layer and the magnesium chloride layer, P4 is the pressure of the junction of the magnesium layer and the magnesium chloride layer in the second measuring cylinder, and H2 is the height difference between the liquid level of the magnesium chloride in the second measuring cylinder and the interface; ρ is a unit of a gradient Mg Is the density of magnesium, p MgCl2 Is the density of magnesium chloride; h2=0.1H1 can be calculated by the above formula;
s22: the relationship of H1 to H2 was calculated by L1 and L2:
H1=L2-L1+H2
s23: the thickness H1 of the magnesium layer is calculated by substituting H2=0.1H1 and the measured L1 and L2 into the equation of step S22.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the liquid level of the magnesium layer can be directly measured by the distance measuring device, the thickness of the magnesium layer can be calculated by comparing the difference between the measured values of the two distance measuring devices through the difference between the density of electrolyte (magnesium chloride) and the density of magnesium, and the method is convenient and quick and has high measuring precision.
2. The distance measuring device is not in contact with the first measuring cylinder and the second measuring cylinder, so that the influence of the deformation of the electrolytic cell shell on the test result can be avoided.
3. The first measuring cylinder and the second measuring cylinder are double-layer sleeves, and a silicate inorganic adhesive is arranged between the two sleeves, so that the corrosion resistance of the measuring cylinder can be improved.
4. The upper end of the first measuring cylinder and the upper end of the second measuring cylinder are sealed, the lower ends of the first measuring cylinder and the second measuring cylinder are open, the sealed ends adopt high-temperature-resistant double-layer glass, the upper ends of the first measuring cylinder and the second measuring cylinder are sealed, magnesium can be prevented from contacting air, and the normal work of the distance measuring device cannot be influenced by the double-layer high-temperature-resistant glass.
5. Adopt argon gas to sweep measuring a section of thick bamboo inside, can avoid the volatile matter to disturb, when having magnesium in the second measuring cylinder simultaneously, can close first valve, open the second valve and discharge liquid magnesium, avoid measuring result error to appear, improve measurement accuracy.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic view of the structure of the measuring cylinder.
The method comprises the following steps of reference numeral, 1-distance measuring device, 2-first measuring cylinder, 3-first valve, 4-first pipeline, 5-second measuring cylinder, 6-second valve, 7-second pipeline, 8-electrolytic bath shell, 9-magnesium layer, 10-magnesium chloride, 11-outer pipe, 12-silicate inorganic adhesive and 13-inner pipe.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.
In the description of the embodiments of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are usually placed in when used, and are only used for convenience of description and simplicity of description, but do not indicate or imply that the devices or elements that are referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
The present invention will be described in detail with reference to FIGS. 1 and 2.
The device for accurately measuring the thickness and the liquid level of magnesium in the magnesium electrolytic cell comprises a first measuring cylinder 2 and a second measuring cylinder 5 which are arranged on an electrolytic cell shell 8, wherein the first measuring cylinder 2 and the second measuring cylinder 5 are both provided with a distance measuring device 1, the lower end of the first measuring cylinder 2 is positioned above a magnesium layer 9, and the lower end of the second measuring cylinder 5 penetrates through the magnesium layer 9 and extends into magnesium chloride 10.
In this embodiment, the distance measuring device 1 is a laser distance measuring instrument. The bracket of the laser range finder is arranged on the transverse steel beside the electrolytic cell shell 8, so as to avoid the influence of the deformation of the electrolytic cell shell on the test result. The distance between the laser distance measuring device and the electrolytic cell shell 8 is about 1500mm. In another embodiment, a radar level gauge is used, which is mounted directly above the distance measuring device, at a distance of about 1500mm from the electrolytic cell housing 8. This height is primarily to reduce the effect of electrolyte volatiles on the measurement.
The first measuring cylinder 2 and the second measuring cylinder 5 are both double-layer sleeves made of 0Cr10Ni9, a silicate inorganic adhesive 12 is arranged between the outer pipe 11 and the inner pipe 13, and the pipes are connected through welding.
In this embodiment, the upper ends of the first measuring cylinder 2 and the second measuring cylinder 5 are closed, the lower ends of the first measuring cylinder and the second measuring cylinder are opened, and the closed ends are made of high temperature resistant double-layer glass.
A first pipeline 4 is arranged between the first measuring cylinder 2 and the second measuring cylinder 5, the second measuring cylinder 5 is connected with a second pipeline 7, argon is introduced into the second pipeline 7, and a first valve 3 and a second valve 6 are respectively arranged on the first pipeline 4 and the second pipeline 7. In this embodiment, the first valve 3 and the second valve 6 are butterfly valves, and the argon pressure is 10kpa.
After the device is installed, a metal rod is inserted into the liquid level and then taken out, and the liquid level height is judged according to the attachment, so that the test result is corrected.
The measurement principle of the device is as follows:
setting the thickness of the magnesium layer as H1, the surface pressure of the magnesium layer as P1, the surface pressure of magnesium chloride in the second measuring cylinder 5 as P2, the pressure of the junction of the magnesium layer and the magnesium chloride layer as P3, the pressure of the junction of the magnesium layer and the magnesium chloride layer in the second measuring cylinder 5 as P4, the height difference between the liquid level of magnesium chloride in the second measuring cylinder 5 and the interface as H2, rho Mg Is the density of magnesium, p MgCl2 Is the density of magnesium chloride.
As can be seen from the liquid internal pressure formula P = ρ gh:
P3=P1+H1×g×ρ Mg
P4=P2+H2×g×ρ MgCl2
since P3 and P4 are two pressures at the same level, and the medium below the two pressures is magnesium chloride, the following steps are carried out:
P3=P4
thus:
P1+H1×g×ρ Mg =P2+H2×g×ρ MgCl2
when P1= P2 there are:
H1×g×ρ Mg =H2×g×ρ MgCl2
finding the density of magnesium chloride and the density of magnesium in a molten state and substituting the density of magnesium into the formula can obtain the following formula:
1.555H1=1.72H2
H2=0.1H1
and measuring the distance L1 from the distance meter to the magnesium layer and the distance L2 from the distance meter to the magnesium chloride layer by using the laser distance meter.
Thickness of the magnesium layer:
H1=L2-L1+H2
L2-L1=H1-H2=0.9H1
the level of magnesium can be read directly from the meter as L1. The thickness H1 of the magnesium layer can be calculated by substituting the values of L1 and L2 into the above formula.
The above-mentioned embodiments only express the specific embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for those skilled in the art, without departing from the technical idea of the present application, several changes and modifications can be made, which are all within the protection scope of the present application.
Claims (4)
1. The device for accurately measuring the thickness and the liquid level of magnesium in the magnesium electrolytic cell is characterized by comprising a first measuring cylinder (2) and a second measuring cylinder (5) which are arranged on an electrolytic cell shell (8), wherein the first measuring cylinder (2) and the second measuring cylinder (5) are both provided with a distance measuring device (1), the lower end of the first measuring cylinder (2) is positioned above a magnesium layer (9), and the lower end of the second measuring cylinder (5) is positioned in magnesium chloride (10) below the magnesium layer (9);
the distance measuring device (1) is movably connected with the first measuring cylinder (2) and the second measuring cylinder (5), the distance measuring device (1) is connected with a support, and the support is fixedly connected with the ground;
the first measuring cylinder (2) and the second measuring cylinder (5) are both double-layer sleeves, and a silicate inorganic adhesive (12) is arranged between the two sleeves;
a first pipeline (4) is arranged between the first measuring cylinder (2) and the second measuring cylinder (5), the second measuring cylinder (5) is connected with a second pipeline (7), argon is introduced into the second pipeline (7), and a first valve (3) and a second valve (6) are respectively arranged on the first pipeline (4) and the second pipeline (7);
the upper ends of the first measuring cylinder (2) and the second measuring cylinder (5) are sealed, the lower ends of the first measuring cylinder and the second measuring cylinder are open, and the sealed ends adopt high-temperature-resistant double-layer glass.
2. An apparatus for accurately measuring the thickness and level of magnesium in a magnesium electrolytic cell according to claim 1 wherein the distance measuring device (1) is a laser range finder or a radar range finder.
3. A method for accurately measuring the thickness and level of magnesium in a magnesium cell, characterized in that the use of the device according to any of claims 1-2 is carried out by the following steps:
s1: measuring the distance L1 from the distance measuring device (1) to the liquid level of the magnesium layer (9) through the distance measuring device (1) and the first measuring cylinder (2), and measuring the distance L2 from the distance measuring device (1) to the liquid level of magnesium chloride (10) in the second measuring cylinder (5) through the distance measuring device (1) and the second measuring cylinder (5);
s2: the thickness of the magnesium layer (9) is calculated from L1, L2 and the relationship between the liquid pressure and the density.
4. A method for the accurate measurement of the thickness and level of magnesium in a magnesium cell according to claim 3, characterized in that the specific steps of calculating the thickness of the magnesium layer (9) in step S2 are:
s21: the relationship of H1 to H2 is calculated from the relationship of liquid pressure to density and depth:
P3=P1+H1×g×ρ Mg
P4=P2+H2×g×ρ MgCl2
P1=P2
P3=P4
in the formula, H1 is the thickness of a magnesium layer, P1 is the pressure of the surface of the magnesium layer, P2 is the pressure of the surface of magnesium chloride in a second measuring cylinder (5), P3 is the pressure of the junction of the magnesium layer and the magnesium chloride layer, P4 is the pressure of the interface of the second measuring cylinder (5) and the magnesium layer and the magnesium chloride layer, which is at the same horizontal plane, and H2 is the height difference between the liquid level of the magnesium chloride in the second measuring cylinder (5) and the interface; rho Mg Is the density of magnesium, p MgCl2 Is the density of magnesium chloride;
s22: the relationship of H1 to H2 was calculated by L1 and L2:
H1=L2-L1+H2
s23: the thickness H1 of the magnesium layer is calculated by substituting the relationship between H1 and H2 in step S21 into the equation in step S22.
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