Efficient 8000A electrolytic furnace and furnace building method thereof

Abstract

The invention discloses an efficient 8000A electrolytic furnace and a furnace building method thereof, and relates to the technical field of rare earth metal production equipment. The efficient 8000A electrolytic furnace comprises an outer steel sleeve, an inner steel sleeve arranged in the outer steel sleeve, a graphite tank arranged in the inner steel sleeve, and a furnace table panel arranged at the tops of the outer steel sleeve, the inner steel sleeve and the graphite tank, a graphite powder layer is filled between the graphite groove and the inner steel sleeve, a bottom refractory brick layer is laid between the bottom wall of the inner steel sleeve and the bottom wall of the outer steel sleeve, and a lower yellow mud soil layer, a middle refractory brick layer and an upper cement mortar layer are sequentially filled between the side wall of the inner steel sleeve and the side wall of the outer steel sleeve from the bottom refractory brick layer to the furnace table panel; the height of the lower yellow mud soil layer is larger than the standard height delta h, and the height of the middle refractory brick layer is smaller than the standard height delta h. The heat preservation effect of the furnace body can be improved, heat loss in the electrolysis process can be reduced, and stability of heat balance in the furnace is facilitated, so that the yield of the 8000A electrolytic furnace is improved, and unit consumption is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of rare earth metal production equipment, and in particular to a high-efficiency 8000A electrolytic furnace and a furnace building method thereof. Background Art

[0002] The electrolytic furnace is not only the key equipment for rare earth molten salt electrolysis production, but also the core technology of rare earth molten salt electrolysis process. In recent years, with the continuous maturity of rare earth electrolysis process, the electrolytic cell has developed from small to large, and the current intensity has also increased from thousands of amperes to tens of thousands of amperes.

[0003] Comparison of technical and economic indicators of electrolytic cells with various current intensities shows that electrolytic cells should choose large current intensities in terms of initial investment and operating costs. At present, the scale of Wan'an cells is mainly 10000A-18000A, with advantages such as high output, low power consumption, and balanced distribution of current field and temperature field. However, Wan'an cells are limited in development and application due to their large cell structure, serious bottoming of the furnace, low total metal content, large fluctuations in metal quality, large capital investment, and low degree of automation, making 6000A-8000A electrolytic cells the main cell type for electrolysis of rare earth metals in fluoride salt systems.

[0004] The 6000A-8000A electrolytic cells are all circular structures, which have uniform current and temperature distribution, stable metal quality and mature technology. However, the current output of an 8000A electrolytic furnace is only 5.5-6 tons / month, while the raw material consumption is more than 1.190 tons / ton, which has the defects of low output and high consumption. Summary of the invention

[0005] The purpose of this application is to provide a high-efficiency 8000A electrolytic furnace and a furnace construction method thereof, so as to solve the problems of low single furnace output and high unit raw material consumption of the existing 8000A electrolytic furnace.

[0006] The technical solution adopted by this application to solve its technical problem is:

[0007] In a first aspect, a high-efficiency 8000A electrolytic furnace is provided, comprising an outer steel sleeve, an inner steel sleeve arranged in the outer steel sleeve, a graphite tank arranged in the inner steel sleeve, and a furnace table panel arranged on top of the outer steel sleeve, the inner steel sleeve and the graphite tank;

[0008] A graphite powder layer is filled between the graphite tank and the inner steel sleeve, a bottom refractory brick layer is laid between the bottom wall of the inner steel sleeve and the bottom wall of the outer steel sleeve, and a lower yellow mud layer, a middle refractory brick layer and an upper cement mortar layer are sequentially filled between the side wall of the inner steel sleeve and the side wall of the outer steel sleeve along the bottom refractory brick layer to the furnace table panel;

[0009] The height of the lower yellow mud layer is greater than its standard height Δh, and the height of the middle refractory brick layer is lower than its standard height Δh.

[0010] Furthermore, the middle refractory brick layer is filled with broken refractory bricks.

[0011] Furthermore, the Δh is 200 mm.

[0012] Furthermore, a corundum gasket is provided between the top of the graphite tank and the furnace table panel.

[0013] Furthermore, the inner diameters of the graphite groove, the inner steel sleeve and the outer steel sleeve are all greater than their respective standard inner diameters ΔD; the thicknesses of the graphite groove, the inner steel sleeve and the outer steel sleeve are all equal to their respective standard thicknesses; and the heights of the graphite groove, the inner steel sleeve and the outer steel sleeve are all equal to their respective standard heights.

[0014] Furthermore, the ΔD is 20 mm.

[0015] In a second aspect, a method for building an efficient 8000A electrolytic furnace is provided, comprising:

[0016] Place the graphite groove into the inner steel sleeve and fill the gap between the two with graphite powder;

[0017] Laying refractory bricks at the bottom of the inner cavity of the outer steel jacket to form a bottom refractory brick layer, and placing the inner steel jacket on the bottom refractory brick layer;

[0018] Filling yellow mud, refractory bricks and cement mortar from bottom to top between the inner steel sleeve and the outer steel sleeve in sequence to form a lower yellow mud layer, a middle refractory brick layer and an upper cement mortar layer, wherein the height of the lower yellow mud layer is greater than its standard height Δh, and the height of the middle refractory brick layer is less than its standard height Δh;

[0019] Install the furnace table panel on the top of the outer steel sleeve, the inner steel sleeve and the graphite tank, put the outer steel sleeve into the furnace pit that has been leveled in advance, put the crucible into the graphite tank, and install the cathode and anode.

[0020] Furthermore, the Δh is 200 mm.

[0021] Furthermore, the inner diameters of the graphite trough, the inner steel sleeve and the outer steel sleeve are all larger than their respective standard inner diameters ΔD; the thicknesses of the graphite trough, the inner steel sleeve and the outer steel sleeve are all equal to their respective standard thicknesses, and the heights of the graphite trough, the inner steel sleeve and the outer steel sleeve are all equal to their respective standard heights; the diameters of the cathode and the anode are all larger than their respective standard diameters Δd, and the pole distance between the cathode and the anode is equal to the standard pole distance.

[0022] Furthermore, the ΔD is 20 mm, and the Δd is 10 mm.

[0023] Beneficial effects of this application:

[0024] The high-efficiency 8000A electrolytic furnace and furnace building method provided in the embodiment of the present application improve the thermal insulation effect of the furnace body and reduce the heat loss during the electrolysis process by changing the furnace building method and adjusting the sizes of the graphite trough and the anode and cathode, which helps to stabilize the thermal balance in the furnace, thereby increasing the single furnace output of the 8000A electrolytic furnace and reducing the unit consumption of raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a structural schematic diagram of an existing 8000A electrolytic furnace;

[0027] Figure 2 It is a schematic diagram of the structure of a high-efficiency 8000A electrolytic furnace provided in an embodiment of the present application.

[0028] Reference numerals:

[0029] 101-outer steel sleeve;

[0030] 102-inner steel sleeve;

[0031] 103-graphite tank;

[0032] 104-stove top panel;

[0033] 105-graphite powder layer;

[0034] 106- bottom refractory brick layer;

[0035] 107-lower yellow mud layer;

[0036] 108- middle refractory brick layer;

[0037] 109- upper refractory mud layer;

[0038] 110-corundum washer;

[0039] 201-outer steel sleeve;

[0040] 202-inner steel sleeve;

[0041] 203-graphite tank;

[0042] 204-stove top panel;

[0043] 205-graphite powder layer;

[0044] 206- bottom refractory brick layer;

[0045] 207-lower yellow mud layer;

[0046] 208-middle refractory brick layer;

[0047] 209-upper cement mortar layer;

[0048] 210-Corundum washer. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0050] In the description of this application, the terms "upper", "lower", "left", "right", "front", "back", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on this application. Unless otherwise specified, the above-mentioned directional descriptions can be flexibly set in the process of actual application under the condition that the relative positional relationship shown in the accompanying drawings is satisfied.

[0051] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0052] Figure 1 Schematic diagram of the structure of an existing 8000A electrolytic furnace, which shows an 8000A electrolytic furnace. Figure 1The existing 8000A electrolytic furnace includes an outer steel jacket 101, the outer steel jacket 101 is provided with an inner steel jacket 102, a graphite groove 103 is arranged in the inner steel jacket 102, a furnace table panel 104 is arranged on the top of the outer steel jacket 101, the inner steel jacket 102 and the graphite groove 103, a corundum gasket 110 is arranged between the top of the graphite groove 103 and the furnace table panel 104, a graphite powder layer 105 is filled between the graphite groove 103 and the inner steel jacket 102, a bottom refractory brick layer 106 is laid between the bottom wall of the inner steel jacket 102 and the bottom wall of the outer steel jacket 101, and a lower yellow mud layer 107, a middle refractory brick layer 108 and an upper refractory mud layer 109 are filled from bottom to top between the side walls of the inner steel jacket 102 and the outer steel jacket 101. The furnace table panel 104 is a hollow structure surrounded by steel plates, into which cooling water is introduced for cooling to prevent the furnace mouth from being too hot and to facilitate operation on the furnace table. The inner cavity height of the furnace table panel 104 is 4.5 cm, and the thickness of the steel plate is 2 cm.

[0053] See also Figure 1 The existing 8000A electrolytic furnace construction process is: use a forklift to lift the graphite tank 103 and put it into the inner steel sleeve 102, and use graphite powder to fill the gap between the inner steel sleeve 102 and the graphite tank 103 to form a graphite powder layer 105; lay a layer of refractory bricks at the bottom of the inner cavity of the outer steel sleeve 101 and fill the gap of the refractory bricks with river sand, compact and level it to form a bottom refractory brick layer 106; lift the inner steel sleeve 102 into the outer steel sleeve 101 and place it on the bottom refractory brick layer 106 On the top, fill the lower part of the gap between the inner steel sleeve 102 and the outer steel sleeve 101 with yellow clay to form a lower yellow clay layer 107, fill the middle part of the gap between the inner steel sleeve 102 and the outer steel sleeve 101 with refractory bricks to form a middle refractory brick layer 108, place the corundum gasket 110 on the top of the graphite groove 103, fill the upper part of the gap between the inner steel sleeve 102 and the outer steel sleeve 101 with refractory mud to form an upper refractory mud layer 109, and then cover the furnace table panel 104 to complete the furnace construction. Among them, the standard height of the lower yellow clay layer 107 is e, the standard height of the middle refractory brick layer 108 is d, and the standard height of the upper refractory mud layer 109 is c.

[0054] When using Figure 1 When the 8000A electrolytic furnace shown in the figure produces rare earth metals, its single furnace output is only 5.5-6 tons / month, but the raw material unit consumption is more than 1.190 tons / ton, which has the defects of low single furnace output and high unit consumption.

[0055] Based on this, see Figure 2The embodiment of the present application provides a high-efficiency 8000A electrolytic furnace, comprising an outer steel jacket 201, an inner steel jacket 202 arranged in the outer steel jacket 201, a graphite tank 203 arranged in the inner steel jacket 202, and a furnace table panel 204 arranged on the top of the outer steel jacket 201, the inner steel jacket 202 and the graphite tank 203; a graphite powder layer 205 is filled between the graphite tank 203 and the inner steel jacket 202, a bottom refractory brick layer 206 is laid between the bottom wall of the inner steel jacket 202 and the bottom wall of the outer steel jacket 201, and a lower yellow mud layer 207, a middle refractory brick layer 208 and an upper cement mortar layer 209 are filled in sequence along the bottom refractory brick layer 206 to the furnace table panel 204 between the side wall of the inner steel jacket 202 and the side wall of the outer steel jacket 201; the height of the lower yellow mud layer 207 is greater than its standard height Δh, and the height of the middle refractory brick layer 208 is lower than its standard height Δh.

[0056] For example, the filling height of the lower loess layer 207 is j, where j=e+Δh; the filling height of the middle refractory brick layer 208 is i, where i=d-Δh; and the filling height of the upper cement mortar layer 209 is h, where h=c. For example, Δh is 200 mm.

[0057] The high-efficiency 8000A electrolytic furnace provided in the embodiment of the present application can effectively ensure the bottom temperature of the furnace body by increasing the height of the lower yellow mud layer 207 and reducing the height of the middle refractory brick layer 208 while ensuring that the overall height of the lower yellow mud layer 207 and the middle refractory brick layer 208 remain unchanged, thereby reducing the impact on the bottom temperature when the furnace is discharged. By changing the filler between the inner steel jacket 202 and the upper part of the side wall of the outer steel jacket 201 from refractory mud to cement mortar, the refractory mud can be prevented from becoming loose and cracking at high temperature, thereby causing the top of the furnace body to be oxidized. The thermal insulation effect of the interior is reduced, which effectively ensures the top temperature of the furnace body, thereby improving the thermal insulation effect of the electrolytic furnace, reducing heat loss during the electrolysis process, avoiding low bottom temperature and high surface temperature, and contributing to the stability of the thermal balance in the furnace; and the stable control of the electrolysis temperature is conducive to the precipitation of carbon, inhibiting the reaction of rare earth metals and carbon, reducing the formation of rare earth carbides, and also improving the flow of molten salt, reducing the content of carbon, improving product quality, and at the same time being conducive to the electrolysis process, improving current efficiency, and increasing output.

[0058] In some embodiments, the middle refractory brick layer 208 is filled with broken refractory bricks. By filling the broken refractory bricks between the inner steel sleeve 202 and the middle of the side wall of the outer steel sleeve 201, the gap can be reduced, the heat preservation effect can be increased, the furnace condition can be stabilized, and the output can be further improved. In some embodiments, a corundum gasket 210 is provided between the top of the graphite tank 203 and the furnace table panel 204. By providing the corundum gasket 210, the top of the graphite tank 203 can be insulated and insulated.

[0059] In some embodiments, the inner diameters of the graphite groove 203, the inner steel sleeve 202 and the outer steel sleeve 201 are all greater than their respective standard inner diameters ΔD; the thicknesses of the graphite groove 203, the inner steel sleeve 202 and the outer steel sleeve 201 are all equal to their respective standard thicknesses, and the heights of the graphite groove 203, the inner steel sleeve 202 and the outer steel sleeve 201 are all equal to their respective standard heights. For example, ΔD is 20 mm.

[0060] Under the same liquid level control conditions, by increasing the inner diameter of the graphite tank 203, the size of the furnace mouth can be increased, and the volume of the molten salt in the furnace increases accordingly; and as the volume of the molten salt in the furnace increases, the influence of operations such as replacing the anode and taking the pot out of the furnace on the temperature can be weakened, which is helpful for controlling the temperature in the furnace and ensuring the stability of the furnace condition; as the inner diameter of the graphite tank 203 increases, the size of the furnace table panel 204 increases accordingly, which can effectively reduce the heat loss of the furnace mouth, and further contribute to the stability of the temperature in the furnace. In this case, the size of the anode and cathode can be increased, thereby increasing the effective reaction area and the reaction interface, which is beneficial to the migration and reaction of the praseodymium-neodymium metal ions in the molten salt. At the same time, after the volume of the molten salt increases, the praseodymium-neodymium metal ions in the molten salt system increase, the circulating material in the molten salt increases, and the output increases.

[0061] The present application also provides a method for building a high-efficiency 8000A electrolytic furnace, comprising:

[0062] S1. Place the graphite groove 203 into the inner steel sleeve 202 and fill the gap between the two with graphite powder.

[0063] Specifically, the graphite groove 203 is placed into the inner steel sleeve 202 using a forklift, with the top of the inner steel sleeve 202 20 mm higher than the top of the graphite groove 203 . The gap between the inner steel sleeve 202 and the graphite groove 203 is filled with graphite powder to ensure that the graphite groove 203 is in the center of the inner steel sleeve 202 and in a horizontal state. The graphite powder in the gap is compacted to form a graphite powder layer 205 .

[0064] S2. Lay refractory bricks at the bottom of the inner cavity of the outer steel jacket 201 to form a bottom refractory brick layer 206 , and place the inner steel jacket 202 on the bottom refractory brick layer 206 .

[0065] Specifically, refractory bricks are laid at the bottom of the inner cavity of the outer steel jacket 201, and the gaps between the refractory bricks are filled with river sand, which are then compacted and leveled to form a bottom refractory brick layer 206. The inner steel jacket 202 with the graphite groove 203 inside is hoisted into the outer steel jacket 201 and placed on the bottom refractory brick layer 206.

[0066] S3. Fill yellow mud, refractory bricks and cement mortar in sequence from bottom to top between the inner steel sleeve 202 and the outer steel sleeve 201 to form a lower yellow mud layer 207, a middle refractory brick layer 208 and an upper cement mortar layer 209. The height of the lower yellow mud layer 207 is greater than its standard height Δh, and the height of the middle refractory brick layer 208 is lower than its standard height Δh.

[0067] Specifically, first, yellow mud is used to fill the lower gap between the inner steel sleeve 202 and the outer steel sleeve 201, ensuring that the inner steel sleeve 202 is in the central position of the outer steel sleeve 201, and the yellow mud is compacted with a tool without loosening to form a lower yellow mud layer 207, wherein the filling height of the lower yellow mud layer 207 is j=e+Δh; then, the broken refractory bricks are used to fill the middle gap between the inner steel sleeve 202 and the outer steel sleeve 201, and the refractory bricks are compacted with a tool without loosening to form a middle refractory brick layer 208, wherein the filling height of the middle refractory brick layer 208 is i=d-Δh; the corundum gasket 210 is placed on the top of the graphite groove 203, and then cement mortar is used to fill the upper gap between the inner steel sleeve 202 and the outer steel sleeve 201 to form an upper cement mortar layer 209, and the filling height is h=c. wherein Δh is 200mm.

[0068] S4. Install the furnace table panel 204 on the top of the outer steel sleeve 201, the inner steel sleeve 202 and the graphite tank 203, put the outer steel sleeve 201 into the furnace pit that has been leveled in advance, put the crucible into the graphite tank 203, and install the cathode and the anode.

[0069] Specifically, the furnace table panel 204 is installed before the cement mortar dries, wherein the furnace table panel 204 can also be connected to the outer steel sleeve 201 by fixing bolts. There is no direct contact between the furnace table panel 204 and the tops of the inner and outer steel sleeves, and a uniform gap of at least 10 mm is maintained. The gap is filled with cement mortar, and the furnace is built. A forklift is used to lift the built electrolytic furnace into the furnace pit that has been leveled in advance, and the electrolytic furnace is ensured to be level. After the cathode is positioned, the anode is installed, the arcing base material is filled, and the arcing carbon rod is placed and then power is turned on to start the arc. After the arc is started, the carbon rod is removed, the cathode is placed in the furnace, and the molybdenum crucible is placed in the bottom of the furnace. The electrolysis operation can be carried out by powering on.

[0070] In some embodiments, the inner diameters of the graphite tank 203, the inner steel sleeve 202 and the outer steel sleeve 201 are all greater than their respective standard inner diameters ΔD; the thicknesses of the graphite tank 203, the inner steel sleeve 202 and the outer steel sleeve 201 are all equal to their respective standard thicknesses; the heights of the graphite tank 203, the inner steel sleeve 202 and the outer steel sleeve 201 are all equal to their respective standard heights; the diameters of the cathode and the anode are all greater than their respective standard diameters Δd, and the pole distance between the cathode and the anode is equal to the standard pole distance. Wherein, ΔD is 20 mm and Δd is 10 mm.

[0071] The method for building an efficient 8000A electrolytic furnace provided in the embodiment of the present application can improve the output of the 8000A electrolytic furnace and reduce unit consumption by changing the furnace building method and adjusting the furnace mouth size and the anode and cathode sizes of the electrolytic furnace. The method is simple and highly operable.

[0072] Comparative Example:

[0073] use Figure 1 The existing 8000A electrolytic furnace produces rare earth metals.

[0074] Example:

[0075] use Figure 2 The high-efficiency 8000A electrolytic furnace provided in the embodiment of the present application produces rare earth metals.

[0076] The difference between the high-efficiency 8000A electrolytic furnace provided in the embodiment of the present application and the existing 8000A electrolytic furnace is that: the inner diameters of the graphite trough 203, the inner steel sleeve 202 and the outer steel sleeve 201 are all increased by 20 mm, and the thickness and height remain unchanged; the diameters of the cathode and the anode are both increased by 10 mm, and the pole distance between the cathode and the anode remains unchanged; the filling height of the lower yellow mud layer 207 is increased by 200 mm from e to j; the middle refractory brick layer 208 is filled with broken refractory bricks, and the filling height is reduced by 200 mm from d to i; the upper cement mortar layer 209 is changed from refractory mud to cement mortar filling, and the filling height remains unchanged.

[0077] Under the same conditions of other process parameters, the results of the praseodymium-neodymium metal produced by the comparative example and the embodiment are as follows:

[0078]

[0079] It can be seen from the above table that, under the same conditions of other process parameters, the high-efficiency 8000A electrolytic furnace provided in the embodiment of the present application can increase the single-furnace output of praseodymium-neodymium metal from 5.63-6.01 tons / month to more than 7.01 tons / month, and reduce the unit consumption of raw materials from 1.194-1.196 tons / ton to less than 1.182 tons / ton, thereby achieving increased production and reduced consumption, and having great economic and social benefits.

[0080] The above are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed in the present application should be covered within the protection scope of the present application.

Claims

1. A high-efficiency 8000A electrolytic furnace, characterized in that: It comprises an outer steel sleeve (201), an inner steel sleeve (202) arranged inside the outer steel sleeve (201), a graphite groove (203) arranged inside the inner steel sleeve (202), and a furnace table panel (204) arranged on top of the outer steel sleeve (201), the inner steel sleeve (202) and the graphite groove (203); A graphite powder layer (205) is filled between the graphite groove (203) and the inner steel sleeve (202); a bottom refractory brick layer (206) is laid between the bottom wall of the inner steel sleeve (202) and the bottom wall of the outer steel sleeve (201); and a lower yellow clay layer (207), a middle refractory brick layer (208) and an upper cement mortar layer (209) are sequentially filled between the side wall of the inner steel sleeve (202) and the side wall of the outer steel sleeve (201) along the bottom refractory brick layer (206) to the furnace table panel (204); The height of the lower yellow clay layer (207) is greater than its standard height Δh, and the height of the middle refractory brick layer (208) is lower than its standard height Δh.

2. The high-efficiency 8000A electrolytic furnace according to claim 1, characterized in that: The middle refractory brick layer (208) is filled with broken refractory bricks.

3. The high-efficiency 8000A electrolytic furnace according to claim 1, characterized in that: The Δh is 200 mm.

4. The high-efficiency 8000A electrolytic furnace according to claim 1, characterized in that: A corundum gasket (210) is provided between the top of the graphite groove (203) and the furnace table panel (204).

5. The high-efficiency 8000A electrolytic furnace according to claim 1, characterized in that: The inner diameters of the graphite groove (203), the inner steel sleeve (202) and the outer steel sleeve (201) are all greater than their respective standard inner diameters ΔD; the thicknesses of the graphite groove (203), the inner steel sleeve (202) and the outer steel sleeve (201) are all equal to their respective standard thicknesses; and the heights of the graphite groove (203), the inner steel sleeve (202) and the outer steel sleeve (201) are all equal to their respective standard heights.

6. The high-efficiency 8000A electrolytic furnace according to claim 5, characterized in that: The ΔD is 20 mm.

7. A method for building a high-efficiency 8000A electrolytic furnace, characterized in that: include: Put the graphite groove (203) into the inner steel sleeve (202), and fill the gap between the two with graphite powder; Laying refractory bricks at the bottom of the inner cavity of the outer steel jacket (201) to form a bottom refractory brick layer (206), and placing the inner steel jacket (202) on the bottom refractory brick layer (206); Yellow mud, refractory bricks and cement mortar are sequentially filled between the inner steel sleeve (202) and the outer steel sleeve (201) from bottom to top to form a lower yellow mud layer (207), a middle refractory brick layer (208) and an upper cement mortar layer (209), wherein the height of the lower yellow mud layer (207) is greater than its standard height Δh, and the height of the middle refractory brick layer (208) is less than its standard height Δh; A furnace table panel (204) is installed on the top of the outer steel sleeve (201), the inner steel sleeve (202) and the graphite tank (203), the outer steel sleeve (201) is placed in a furnace pit that has been leveled in advance, the crucible is placed in the graphite tank (203), and the cathode and the anode are installed.

8. The method for building a high-efficiency 8000A electrolytic furnace according to claim 7, characterized in that: The Δh is 200 mm.

9. The method for building a high-efficiency 8000A electrolytic furnace according to claim 7, characterized in that: The inner diameters of the graphite groove (203), the inner steel sleeve (202) and the outer steel sleeve (201) are all larger than their respective standard inner diameters ΔD; the thicknesses of the graphite groove (203), the inner steel sleeve (202) and the outer steel sleeve (201) are all equal to their respective standard thicknesses; the heights of the graphite groove (203), the inner steel sleeve (202) and the outer steel sleeve (201) are all equal to their respective standard heights; the diameters of the cathode and the anode are all larger than their respective standard diameters Δd, and the pole distance between the cathode and the anode is equal to the standard pole distance.

10. The method for building a high-efficiency 8000A electrolytic furnace according to claim 9, characterized in that: The ΔD is 20 mm, and the Δd is 10 mm.

Images