Method for integrated production of an aluminum electrolytic metal anode housing and electrical connections

Abstract

The application provides a preparation method of an aluminum electrolytic metal anode shell and electrical connection integration, wherein metal shell powder is mixed with a thermoplastic adhesive to obtain a semi-solid hot material, the semi-solid hot material is crushed to obtain metal shell feed particles, a mold is preheated to 20-50 DEG C higher than a softening point, then the preheated feed particles are filled into the mold, pressure is applied, and the temperature is raised to 5-50 DEG C higher than the softening point temperature of the thermoplastic adhesive to obtain a metal shell blank by rheological pressing, alloy inner core powder is filled into the core of the metal shell blank to obtain an inert anode blank with an alloy inner core, and the inert anode blank with the alloy inner core is sintered to obtain an inert anode for aluminum electrolysis; the application realizes near-net forming of an anode shell with a special-shaped structure by a rheological pressing method, and the densification of the anode shell and electrical connection can be simultaneously completed by using a two-step sintering method, the process operation is simple, the process is short, and the obtained anode has high strength and high precision.

Description

Technical Field

[0001] This invention belongs to the field of powder metallurgy and powder engineering technology, and specifically relates to an integrated preparation method of aluminum electrolysis metal anode shell and electrical connection. Background Technology

[0002] Carbon-free aluminum electrolysis technology based on inert anodes can reduce carbon consumption and eliminate greenhouse gas and toxic gas emissions during electrolysis, making it a key area of ​​focus for the international aluminum industry. Fe-Ni series alloys can withstand harsh and complex electrolytic corrosion environments in cryolite molten salts above 700℃, and possess excellent electrical conductivity, thermal shock resistance, and mechanical strength, making them an important class of inert anode materials. Currently, the manufacturing of large-size, complex-shaped inert anodes and their stable electrical connection to the metal core remain crucial to the industrial application of metallic inert anodes.

[0003] Patent CN113172222A discloses a method for preparing aluminum electrolytic cermet inert anodes based on gel injection molding, which can achieve rapid near-net-shape forming of cermet inert anodes, but the method has limited forming capability for large-size anodes; Patent CN113337849A describes a 3D printing method for preparing complex structure cermet inert anodes, which can achieve near-net-shape forming of T-shaped structure anodes through additive manufacturing, but the manufacturing process is long and does not consider the electrical connection of irregular structures; Patent CN108396335A discloses a connection structure and preparation method of cermet-based inert anode and guide rod, the connection structure is composed of cermet-based inert anode, intermediate alloy ingot and metal conductive rod, but this process is complex and the process is long; Patent CN 101851767A describes a ceramic-based anode and its preparation and assembly method, in which filler is added to the ceramic anode and metal guide rod to connect them, but this method is not easy to connect irregular parts. Summary of the Invention

[0004] To address the aforementioned technical problems in the background art, the present invention aims to provide an integrated preparation method for complex structure metal inert anodes and their electrical connections. This method achieves near-net-shape forming of irregularly shaped anode shells through rheological pressing, with rapid process and high forming precision. Simultaneously, the densification of the anode shell and electrical connections is completed in one-step sintering, eliminating the need for a separate electrical connection process. This method is suitable for mass production of inert anodes for aluminum electrolysis with complex geometries, high performance, and high precision.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This invention discloses an integrated preparation method for an aluminum electrolysis metal anode shell and electrical connection. The method involves mixing metal shell powder with a thermoplastic binder to obtain a semi-solid thermal material, crushing the semi-solid thermal material to obtain metal shell feed particles, preheating a mold to 20-50°C above its softening point, filling the mold with the preheated feed particles, applying pressure, and heating to 5-50°C above the softening point of the thermoplastic binder using rheological pressing to obtain a metal shell blank. Alloy core powder is then filled into the core of the metal shell blank to obtain an inert anode blank with an alloy core. Finally, the inert anode blank with the alloy core is sintered to obtain an inert anode for aluminum electrolysis.

[0007] The preparation method provided by this invention first achieves near-net-shape forming of an irregularly shaped anode shell blank using a rheological pressing method. Rheological pressing involves preheating the feed particles and placing them directly into a mold cavity. The mold cavity is heated above the softening point of the thermoplastic binder. Utilizing the high wetting properties of the interface between the binder and the powder, the binder flows under capillary force, driving secondary distribution and particle rearrangement of the powder in the material. This achieves stable filling of complex shapes and fine structures, resulting in a highly uniform and dense precision part blank. After obtaining the irregularly shaped anode shell blank, an alloy core powder that will form an electrical connection is then filled into the irregularly shaped anode shell blank. Finally, it is integrally sintered to obtain an inert anode for aluminum electrolysis.

[0008] In a preferred embodiment, the metal shell powder has the following composition by mass percentage: Ni 10-60%, M 5-30%, and the balance being Fe, wherein M is selected from at least one of Cu, Co, Cr, Mn, Al, Ag, Zn, Ti, Sn, W, Mo, Zr, and Nb.

[0009] In a preferred embodiment, the particle size of the metal shell powder is 0.05–1 μm.

[0010] In a further preferred embodiment, the metal shell powder is obtained by crushing and classifying metal powder. The crushing method is to perform nano-grinding using a turbine nano-grinding mill. The operating parameters for nano-grinding are: rotation speed of 580-1500 rpm, flow rate of 50-500 L / H, and zirconium bead filling ratio of 60-70%.

[0011] The grading method is to use a jet-type air classifier for grading. The working parameters during grading are: feed speed 50-100 kg / h, working pressure 1.5-20 MPa, and cyclone collector air pressure 1.5-20 kPa.

[0012] The inventors discovered that by performing the above-mentioned crushing and grading operations, metal shell powder with uniform particle size and narrow distribution range can be obtained.

[0013] In a preferred embodiment, the volume fraction of the metal shell powder in the semi-solid thermal material is 60% to 80%; more preferably 60% to 70%.

[0014] In a preferred embodiment, the thermoplastic adhesive comprises, by volume percentage: 60-94.5 vol% filler adhesive, 5-30 vol% backbone adhesive, 1-10 vol% surfactant, and 0.5-5% plasticizer.

[0015] In a preferred embodiment, the melt flow index of the filler binder is ≥80 g / min, and the melt flow index of the backbone binder is ≥35 g / min.

[0016] The semi-solid thermoplastic material for precision components provided by this invention has high interfacial wetting characteristics between the thermoplastic binder and the raw material powder. The raw material powder has a high volume fraction, but the binder content is low, which can maintain good blank strength. When heated to above the softening point temperature of the thermoplastic binder, under certain pressure and capillary force, slow viscous migration will occur, which will drive the secondary distribution / particle rearrangement of the powder in the material. During this stage, the porosity gradually decreases, and a highly uniform and dense precision part blank is obtained, realizing the densification process.

[0017] In this invention, the volume fraction of thermoplastic binder cannot be too high, because if the viscosity of the material is too low, the material will shear thinning in the gap between the die and the mold and flow out continuously, causing pressure relief and local powder separation, reducing the forming density and surface quality of the blank; based on this, the binder content of the rheological pressing material can be further reduced compared with the injection molding process, thus improving the dimensional accuracy of the manufactured parts.

[0018] In a further preferred embodiment, the thermoplastic adhesive, by volume percentage, comprises: 70-85 vol% filler binder, 10-20 vol% backbone binder, 2-5 vol% surfactant, and 0.5-2% plasticizer. Using this preferred thermoplastic adhesive formulation, the resulting powder metallurgy rheological pressing material, after rheological pressing and sintering, yields products with optimal performance.

[0019] In a preferred embodiment, the filler binder is selected from at least one of paraffin wax, carnauba wax, microcrystalline wax, polyethylene wax, polyethylene glycol, polyoxymethylene, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate, and methylcellulose, preferably at least one of carnauba wax, polyoxymethylene, and polyethylene glycol, and more preferably polyoxymethylene.

[0020] The backbone binder is selected from at least one of polypropylene, high-density polyethylene, low-density polyethylene, polystyrene, and polymethyl methacrylate.

[0021] The surfactant is selected from at least one of stearic acid, zinc stearate, glycerol, castor oil, and peanut oil;

[0022] The plasticizer is selected from at least one of dibutyl phthalate, dioctyl phthalate, isooctyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, pentaerythritol 4-[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 4,4'-methylenebis(2,6-di-tert-butylphenol), and n-octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate.

[0023] In this invention, high-density polyethylene refers to polyethylene with a density of 0.94-0.97 g / cm³. 3 Low-density polyethylene (LDPE) refers to polyethylene with a density of 0.91-0.93 g / cm³. 3 Polyethylene.

[0024] In a preferred embodiment, the mixing temperature is 120–200°C, and the mixing time is 30–60 minutes. The mixing of this invention is carried out in a roll-type medium-temperature internal mixer.

[0025] In a preferred embodiment, the heating temperature during crushing is 60–150°C, and the screw speed is 400–600 r / min. The crushing is carried out in a screw extrusion hot-cutting granulator.

[0026] In a preferred embodiment, the particle size of the metal-shelled feed particles is -10 mesh to +200 mesh. Controlling the particle size of the metal-shelled feed particles within this range results in optimal filling performance.

[0027] In a preferred embodiment, the mold is a modular heatable mold, which includes a modular female mold A, a modular female mold B, an upper punch, a lower punch, a core rod, and a heating sleeve.

[0028] In actual operation, first install the mold, and put in the core rod fixing base and base platform; install the lower die punch, and fill the material bin with the preheated metal shell feeding particle mold; connect the combined female mold A and combined female mold B, and then pressurize and heat it above the feeding softening point, so that the feeding softens and is held for a period of time, so that the feeding is secondary distributed and the particles are rearranged, thus filling the mold; stop heating, wait for cooling, release the pressure, and take out the base and core rod, thus obtaining a metal shell blank with a hollow core.

[0029] In a preferred embodiment, the metal-shelled feed pellets are preheated to 60–80°C, while the mold is preheated to 60–100°C.

[0030] In a preferred embodiment, pressure is applied along the pressing direction of the outer shell to 20–60 MPa, and the temperature is raised to 120–170 °C. The metal outer shell blank is obtained by rheological pressing for 10–40 min.

[0031] In this invention, rheological pressing for 10 to 40 minutes refers to heating to 120 to 170°C and holding the feed for 10 to 40 minutes after the feed has softened.

[0032] In a preferred embodiment, the sintering is carried out under a protective atmosphere. The sintering process is as follows: first, the temperature is raised to 400-600℃ and held for 8-12 hours; then, the temperature is raised to K1; then, the temperature is lowered to K2 and held for 4-6 hours; and finally, the temperature is cooled to room temperature. Wherein, K1-K2 ≥ 50℃, preferably 100-150℃, K1 is 1300-1400℃, and K2 is 1150-1350℃.

[0033] The sintering process of this invention first introduces flowing argon gas and heats to the degreasing temperature for degreasing. Then, it continues to heat to the melting temperature K1 of the inner core alloy to melt the inner core. At this time, the outer shell is not yet completely sintered and dense. By utilizing the gravity of the molten alloy itself and the capillary action between it and the pores on the surface of the outer shell material, a good solid-liquid interface is formed. Then, the temperature is lowered to K2 to solidify the core. After that, through further heat preservation, the remaining pores and defects between the interfaces are eliminated, and finally a dense outer shell and a stable electrical connection are obtained. Then, the temperature is lowered to the sintering temperature of the metal outer shell, and finally cooled to room temperature.

[0034] In a further preferred embodiment, the protective atmosphere is argon.

[0035] In a further preferred embodiment, the cooling process involves first cooling the temperature to 400-500°C at a rate of <5°C / min, and then cooling it to room temperature along with the furnace.

[0036] Compared with the prior art, the present invention has the following advantages:

[0037] (1) The present invention provides an integrated manufacturing method for aluminum electrolytic metal anode shell and electrical connection. The method achieves near-net-shape forming of irregularly shaped anode shell by rheological pressing, which solves the problems of complex forming process, poor forming accuracy and low strength of forming blank for large-size aluminum electrolytic metal anode.

[0038] (2) The present invention provides an integrated manufacturing method for aluminum electrolytic metal anode shell and electrical connection. The two-step sintering method can simultaneously complete the densification of the anode shell and electrical connection, solving problems such as low bonding strength of the guide rod electrical connection part and anode cracking caused by secondary processing.

[0039] (3) The present invention provides an integrated manufacturing method for aluminum electrolytic metal anode shell and electrical connection. The process is simple and the process is short. The anode obtained has high strength and high precision, which solves the contradiction that it is difficult to achieve near net shape and mass short process manufacturing at the same time in the preparation of complex shaped anodes. Attached Figure Description

[0040] Figure 1This is a process flow diagram of the present invention.

[0041] Figure 2 This is a schematic diagram of the mold structure of the present invention.

[0042] Figure 3 This is a schematic diagram of the anode structure of the present invention; 1 is the metal anode shell; 2 is the alloy inner core. Detailed Implementation

[0043] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention. The embodiments of the present invention include:

[0044] Example 1: An integrated manufacturing method for an aluminum electrolysis Fe-Ni-Cu alloy anode shell and electrical connection

[0045] Step S1: Fe powder with an average particle size of 0.4 μm, Ni powder with an average particle size of 0.4 μm, and Cu powder with an average particle size of 0.1 μm are obtained using nano-grinding and air classifying technology. The operating parameters of the turbine nano-grinding mill are: rotation speed 800 rpm, flow rate 60 L / H, and zirconium bead loading ratio 60%. The operating parameters of the jet air classifier are: feed rate 60 kg / h, working pressure 10 MPa, and cyclone collector air pressure 15 kPa.

[0046] Step S2: Add 4 kg of Fe powder, 5 kg of Ni powder, and 10 kg of Cu powder to a 30% thermoplastic binder and mix thoroughly to obtain a semi-solid thermal material. The binder contains polyethylene glycol: polymethyl methacrylate: glycerol: zinc diphthalate in a volume ratio of 75%: 20%: 3%: 2%. The mixing temperature is 150℃ and the mixing time is 45 min.

[0047] Step S3 involves filling the mold with the material described in step S1, and pressing the metal shell into shape using a rheological pressing method. This specifically includes the following sub-steps:

[0048] Sub-step A1: Preheat the mold to 60°C; preheat the feed to 80°C.

[0049] Sub-step A2: Install the mold, place the core rod fixing base and base platform; install the lower die punch, fill the material bin with the preheated die feeder; connect the combined female mold A and the combined female mold B;

[0050] Sub-step A3: Apply pressure to 60MPa along the pressing direction of the outer shell, and continue to heat the mold to 160℃. After the feed material softens, maintain the temperature for 40 minutes.

[0051] Sub-step A4: Stop heating, wait for cooling, release pressure, and remove the base and core rod.

[0052] Step S4: Fill the inner cavity after removing the core rod with 4 kg of gas-atomized Cu-20Ni-10Ti alloy powder with an average particle size of 50 μm, put the core rod back in and compact it with a pressure of 10 MPa to obtain an inert anode blank with an alloy core.

[0053] Step S5 involves placing the inert anode blank with an inner core, as described in step S3, into an atmosphere sintering furnace to complete degreasing, sintering, and connection of the inner core. This specifically includes the following sub-steps:

[0054] Sub-step B1: Introduce flowing argon gas and heat to 500°C at a rate of 8°C / min, and hold at that temperature for 10 hours;

[0055] Sub-step B2: Continue heating at a rate of 5°C / min to 1300°C;

[0056] Sub-step B3 involves cooling the temperature to 1150℃ at a rate of 3℃ / min and holding it at that temperature for 4 hours.

[0057] In sub-step B4, argon gas is continuously introduced, and the temperature is first lowered to 400°C at a rate of 5°C / min, and then cooled to room temperature with the furnace.

[0058] The final inert anode has an external dimensional accuracy of less than ±2.0 mm / 100 mm, a shell porosity of less than 5% after sintering, and a shear strength of 126 MPa at the interface.

[0059] Example 2: An integrated manufacturing method for the Fe-Ni-Cr alloy anode shell and electrical connection in aluminum electrolysis.

[0060] Step S1: Using nano-grinding and air classifying technology, the gas-atomized Fe-50Ni-5Cr alloy powder is processed to an average particle size of 0.4μm. The operating parameters of the turbine nano-grinding mill are: rotation speed 800rpm, flow rate 60L / H, zirconium bead loading ratio 60%. The operating parameters of the jet-type air classifier are: feed rate 60kg / h, working pressure 10MPa, and cyclone collector air pressure 15KPa.

[0061] Step S2: Add 10 kg of Fe-50Ni-5Cr alloy powder to a thermoplastic binder with a volume fraction of 40% and mix thoroughly to obtain a semi-solid thermal material. The binder contains polyethylene glycol: polymethyl methacrylate: glycerol: zinc diphthalate in a volume ratio of 75%: 20%: 3%: 2%. The mixing temperature is 150℃ and the mixing time is 45 min.

[0062] Step S3 involves filling the mold with the material described in step S1, and pressing the metal shell into shape using a rheological pressing method. This specifically includes the following sub-steps:

[0063] Sub-step A1: Preheat the mold to 60°C; preheat the feed to 80°C.

[0064] Sub-step A2: Install the mold, place the core rod fixing base and base platform; install the lower die punch, fill the material bin with the preheated die feeder; connect the combined female mold A and the combined female mold B;

[0065] Sub-step A3: Apply pressure to 60MPa along the pressing direction of the outer shell, and continue to heat the mold to 160℃. After the feed material softens, maintain the temperature for 40 minutes.

[0066] Sub-step A4: Stop heating, wait for cooling, release pressure, and remove the base and core rod.

[0067] Step S4: Fill the inner cavity after removing the core rod with 4 kg of gas-atomized Cu-20Ni-10Ag alloy powder with an average particle size of 50 μm, put the core rod back in and compact it with a pressure of 10 MPa to obtain an inert anode blank with an alloy core.

[0068] Step S5 involves placing the inert anode blank with an inner core, as described in step S3, into an atmosphere sintering furnace to complete degreasing, sintering, and connection of the inner core. This specifically includes the following sub-steps:

[0069] Sub-step B1: Introduce flowing argon gas and heat to 500°C at a rate of 8°C / min, and hold at that temperature for 10 hours;

[0070] Sub-step B2: Continue heating at a rate of 5°C / min to 1300°C;

[0071] Sub-step B3 involves cooling the temperature to 1150℃ at a rate of 3℃ / min and holding it at that temperature for 4 hours.

[0072] In sub-step B4, argon gas is continuously introduced, and the temperature is first lowered to 400°C at a rate of 5°C / min, and then cooled to room temperature with the furnace.

[0073] The final inert anode has an external dimensional accuracy of less than ±2.0 mm / 100 mm, a shell porosity of less than 5% after sintering, and a shear strength of 103 MPa at the interface.

[0074] Example 3: An integrated manufacturing method for an aluminum electrolysis Fe-Ni-W-Mo alloy anode shell and electrical connection. Step S1: Nano-grinding and air classifying technology are used to obtain Fe powder, Ni powder, W powder and Mo powder with an average particle size of 5μm; the working parameters of the turbine nano-grinding mill are: rotation speed 800rpm, flow rate 60L / H, zirconium bead loading ratio 60%; the working parameters of the jet air classifier are: feed rate 60kg / h, working pressure 10MPa, cyclone collector air pressure 15KPa;

[0075] Step S2: Add 4 kg of Fe powder, 3 kg of Ni powder, 1.5 kg of W powder and 1.5 kg of Mo powder to a 40% thermoplastic binder and mix thoroughly to obtain a semi-solid thermal material. The binder contains polyethylene glycol: polymethyl methacrylate: glycerol: zinc diphthalate in a volume ratio of 75%: 20%: 3%: 2%. The mixing temperature is 150℃ and the mixing time is 45 min.

[0076] Step S3 involves filling the mold with the material described in step S1, and pressing the metal shell into shape using a rheological pressing method. This specifically includes the following sub-steps:

[0077] Sub-step A1: Preheat the mold to 60°C; preheat the feed to 80°C.

[0078] Sub-step A2: Install the mold, place the core rod fixing base and base platform; install the lower die punch, fill the material bin with the preheated die feeder; connect the combined female mold A and the combined female mold B;

[0079] Sub-step A3: Apply pressure to 40MPa along the pressing direction of the outer shell, and continue to heat the mold to 150℃. After the feed material softens, maintain the temperature for 40 minutes.

[0080] Sub-step A4: Stop heating, wait for cooling, release pressure, and remove the base and core rod.

[0081] Step S4: Fill the inner cavity after removing the core rod with 4 kg of gas-atomized Cu-30Ni-20Co alloy powder with an average particle size of 50 μm, put the core rod back in and compact it with a pressure of 10 MPa to obtain an inert anode blank with an alloy core.

[0082] Step S5 involves placing the inert anode blank with an inner core, as described in step S3, into an atmosphere sintering furnace to complete degreasing, sintering, and connection of the inner core. This specifically includes the following sub-steps:

[0083] Sub-step B1: Introduce flowing argon gas and heat to 500°C at a rate of 8°C / min, and hold at that temperature for 10 hours;

[0084] Sub-step B2: Continue heating at a rate of 5°C / min to 1400°C;

[0085] Sub-step B3: Cool to 1300℃ at a rate of 3℃ / min and hold for 4 hours;

[0086] In sub-step B4, argon gas is continuously introduced, and the temperature is first lowered to 400°C at a rate of 5°C / min, and then cooled to room temperature with the furnace.

[0087] The final inert anode has an external dimensional accuracy of less than ±2.0 mm / 100 mm, a shell porosity of less than 5% after sintering, and a shear strength of 137 MPa at the interface.

[0088] Comparative Example 1

[0089] The other conditions were the same as in Example 1, except that the thermoplastic binder content in step S2 was 50%. As a result, the excessively high binder content could not be completely removed during the sintering process, leading to severe cracking of the anode shell after sintering.

[0090] Comparative Example 2

[0091] The other conditions were the same as in Example 1, except that the sintering in step S5 was carried out by directly heating to 1400°C, holding for 4 hours and then cooling to room temperature. As a result, the alloy core separated from the outer shell due to solidification shrinkage.

[0092] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. An integrated preparation method for an aluminum electrolytic metal anode shell and electrical connection, characterized in that: A semi-solid hot material is obtained by mixing metal shell powder with a thermoplastic binder. The semi-solid hot material is crushed to obtain metal shell feed particles. The mold is preheated to 20-50°C above the softening point of the thermoplastic binder. The preheated feed particles are then filled into the mold, pressurized, and heated to 5-50°C above the softening point of the thermoplastic binder. The metal shell blank is obtained by rheoforming. Alloy core powder is filled into the core of the metal shell blank to obtain an inert anode blank with an alloy core. The inert anode blank with an alloy core is sintered to obtain an integrated inert anode for aluminum electrolysis with an aluminum electrolysis metal anode shell and electrical connection. The metal shell powder, by mass percentage, has the following composition: Ni 10~60%, M 5~30%, with the balance being Fe, wherein M is selected from at least one of Cu, Co, Cr, Mn, Al, Ag, Zn, Ti, Sn, W, Mo, Zr, and Nb; The particle size of the metal-shelled feed particles is -10 mesh to +200 mesh; Preheat the metal-shelled feed pellets to 60~80℃, and at the same time preheat the mold to 60~100℃; Apply pressure to 20~60MPa along the pressing direction of the outer shell and heat to 120~170℃, then perform rheological pressing for 10~40min to obtain a metal outer shell blank; The sintering is carried out under a protective atmosphere. The sintering process is as follows: first, the temperature is raised to 400~600℃ and held for 8~12 hours, then the temperature is raised to K1, then lowered to K2 and held for 4~6 hours, and then cooled to room temperature. Where K1-K2≥50℃, K1 is 1300~1400℃, and K2 is 1150~1350℃.

2. The integrated preparation method of the aluminum electrolytic metal anode shell and electrical connection according to claim 1, characterized in that: The particle size of the metal shell powder is 0.05~1μm; The metal shell powder is obtained by crushing and classifying metal powder. The crushing method is to use a turbine nano-grinding mill for nano-grinding. The working parameters during nano-grinding are: rotation speed of 580~1500rpm and flow rate of 50~500L / H. The grading method is to use a jet-type air classifier for grading. The working parameters during grading are: feed speed 50~100kg / h, working pressure 1.5~20MPa, and cyclone collector air pressure 1.5~20KPa.

3. The integrated preparation method of the aluminum electrolytic metal anode shell and electrical connection according to claim 1, characterized in that: In the semi-solid thermal material, the volume fraction of the metal shell powder is 60%~80%.

4. The integrated preparation method of the aluminum electrolytic metal anode shell and electrical connection according to claim 1, characterized in that: The thermoplastic adhesive comprises, by volume percentage: 70-85 vol% filler adhesive, 10-20 vol% backbone adhesive, 2-5 vol% surfactant, and 0.5-2% plasticizer. The melt flow index of the filler binder is ≥80 g / min, and the melt flow index of the backbone binder is ≥35 g / min.

5. The integrated preparation method of the aluminum electrolysis metal anode shell and electrical connection according to claim 4, characterized in that: The filler binder is selected from at least one of paraffin wax, carnauba wax, microcrystalline wax, polyethylene wax, polyethylene glycol, polyoxymethylene, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate, and methylcellulose; The backbone binder is selected from at least one of polypropylene, high-density polyethylene, low-density polyethylene, polystyrene, and polymethyl methacrylate. The surfactant is selected from at least one of stearic acid, zinc stearate, glycerol, castor oil, and peanut oil; The plasticizer is selected from at least one of dibutyl phthalate, dioctyl phthalate, isooctyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, pentaerythritol 4-[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 4,4'-methylenebis(2,6-di-tert-butylphenol), and n-octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate.

6. The integrated preparation method of the aluminum electrolytic metal anode shell and electrical connection according to claim 5, characterized in that: The filler adhesive is selected from at least one of carnauba wax, polyoxymethylene, and polyethylene glycol.

7. The integrated preparation method of the aluminum electrolysis metal anode shell and electrical connection according to claim 6, characterized in that: The filler adhesive is polyoxymethylene.

8. The integrated preparation method of the aluminum electrolytic metal anode shell and electrical connection according to claim 1, characterized in that: The mixing temperature is 120~200℃, and the mixing time is 30~60min; The heating temperature during crushing is 60~150℃, and the screw speed is 400~600r / min.

9. The integrated preparation method of the aluminum electrolytic metal anode shell and electrical connection according to claim 1, characterized in that: The mold is a modular, heatable mold, which includes a combined female mold A, a combined female mold B, an upper punch, a lower punch, a core rod, and a heating sleeve.

10. The integrated preparation method of the aluminum electrolytic metal anode shell and electrical connection according to claim 1, characterized in that: The protective atmosphere is argon; The cooling process involves first cooling the temperature to 400-500°C at a rate of <5°C / min, and then cooling it to room temperature along with the furnace.

Images