Integrated preparation method for aluminum electrolysis metal anode shell and electric connection

Abstract

An integrated preparation method for an aluminum electrolysis metal anode shell (1) and electrical connection. The method comprises: mixing a metal shell powder and a thermoplastic adhesive to obtain a semi-solid hot material, crushing the semi-solid hot material to obtain metal shell feeding particles, preheating a mold to 60-100°C, then filling the preheated feeding particles into the mold, performing pressurization, raising the temperature to 5-50°C above the softening point temperature of the thermoplastic adhesive, performing rheological pressing to obtain a metal shell blank, filling an alloy inner core powder into the core of the metal shell blank to obtain an inert anode blank having an alloy inner core (2), and sintering the inert anode blank having the alloy inner core (2) to obtain an inert anode for aluminum electrolysis.

Description

Integrated preparation method for aluminum electrolytic metal anode shell and electrical connection Technical Field

[0001] The invention belongs to the technical field of powder metallurgy and powder engineering, and particularly relates to an integrated preparation method for an aluminum electrolytic metal anode shell and an electrical connection. Background Art

[0002] Carbon-free aluminum electrolysis technology based on inert anodes can reduce carbon consumption and eliminate greenhouse gas and toxic gas emissions during the electrolysis process, and is currently a key area of ​​focus for the international aluminum industry. Fe-Ni alloys are able to withstand the harsh and complex electrolytic corrosion environment in cryolite molten salts above 700°C, and possess excellent electrical conductivity, thermal shock resistance, and mechanical strength, making them an important class of inert anode materials. Currently, the manufacture of large-scale, complex-shaped inert anodes and their stable electrical connection to the metal core have been key factors in determining the industrial application of metal inert anodes. Technical issues

[0003] Patent CN113172222A discloses a method for preparing metal-ceramic inert anodes for aluminum electrolysis based on a gel injection molding process, which can achieve rapid net-form forming of metal-ceramic inert anodes, but this method has limited forming capabilities for large-sized anodes; Patent CN113337849A describes a 3D printing method for preparing metal-ceramic inert anodes with complex structures, which can achieve near-net-form forming of T-shaped anodes through additive manufacturing, but the manufacturing process is long and does not consider electrical connection of special-shaped structures; Patent CN108396335A discloses a metal-ceramic-based inert anode and guide rod connection structure and preparation method, which consists of a metal-ceramic-based inert anode, an intermediate alloy ingot and a 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, which adds filler to the ceramic anode and metal guide rod to connect and form them, but this method is not easy to connect special-shaped parts. Technical Solutions

[0004] In order to solve the above-mentioned technical problems existing in the background technology, the purpose of the present invention is to provide an integrated preparation method for a complex structure metal inert anode and its electrical connection, which realizes the near-net forming of the anode shell of the special-shaped structure by rheological pressing. The process is rapid and the forming precision is high. At the same time, the densification of the anode shell and the electrical connection is completed simultaneously by one-step sintering, and no separate electrical connection process is required. The method is suitable for mass production of inert anodes for aluminum electrolysis with complex geometry, high performance and high precision.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] The present invention provides an integrated preparation method for a metal anode shell and an electrical connection for aluminum electrolysis. The method comprises the following steps: mixing metal shell powder with a thermoplastic adhesive to obtain a semi-solid hot material; crushing the semi-solid hot material to obtain metal shell feed particles; preheating a mold to 60-100° C.; filling the preheated metal shell feed particles into the mold; applying pressure, and heating the mold to a temperature 5-50° C. above the softening point of the thermoplastic adhesive to perform rheological pressing to obtain a metal shell blank; filling the core of the metal shell blank with alloy core powder to obtain an inert anode blank with an alloy core; and sintering the inert anode blank with the alloy core to obtain an inert anode for aluminum electrolysis.

[0007] The preparation method provided by the present invention first uses a rheological pressing method to achieve near-net-net forming of a special-shaped anode shell blank. The rheological pressing forming is carried out by preheating feed particles and then directly placing them in a mold cavity, heating the mold cavity to above the softening point of a thermoplastic adhesive, utilizing the high wettability of the interface between the adhesive and the powder. Under the action of capillary force, the adhesive flows and drives the secondary distribution of the powder in the material and the rearrangement of the particles, thereby achieving stable filling of complex-shaped fine structures and obtaining a highly uniform and dense precision part blank; obtaining a special-shaped anode shell blank, and then filling the special-shaped anode shell blank with an alloy inner core powder that will form an electrical connection, and then sintering the blank as a whole 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 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] Further preferably, the metal shell powder is obtained by crushing and classifying metal powder, the crushing method is nano-grinding using a turbine nano-sand mill, and the operating parameters during the nano-grinding are: a speed of 580-1500 rpm, a flow rate of 50-500 L / H, and a zirconium bead filling ratio of 60-70%;

[0011] The classification method is to use a jet airflow classifier for classification, and the working parameters during the classification are: feed rate 50~100kg / h, working pressure 1.5~20MPa, and cyclone collector wind pressure 1.5~20KPa.

[0012] The inventors have discovered that through the above-mentioned crushing and classification 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%, preferably 60-70%.

[0014] In a preferred embodiment, the thermoplastic adhesive is composed of the following components 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 index of the filling binder is ≥80 g / min, and the melt index of the backbone binder is ≥35 g / min.

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

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

[0018] Furthermore, the thermoplastic binder preferably comprises, by volume percentage, 70-85 vol% filler binder, 10-20 vol% backbone binder, 2-5 vol% surfactant, and 0.5-2% plasticizer. Using this preferred thermoplastic binder formulation, the resulting powder metallurgy rheological pressing material exhibits optimal product performance after rheological pressing and sintering.

[0019] In a preferred embodiment, the filling 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, β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, 4[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester, 4,4'-methylenebis(2,6-di-tert-butylphenol), and 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate.

[0023] In the present invention, high-density polyethylene refers to a polyethylene having a density of 0.94-0.97 g / cm 3 Low-density polyethylene refers to polyethylene with a density of 0.91-0.93 g / cm 3 of polyethylene.

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

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

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

[0027] Preferably, the metal shell feed particles are preheated to 60-80°C.

[0028] Preferably, the mold is a combined 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.

[0029] In the actual operation process, first install the mold, put in the core rod fixed base and base table; install the lower punch, and fill the preheated metal shell feeding particle mold feeding material into the material bin; connect the combined female mold A and the combined female mold B, and then pressurize and heat it to above the softening point of the feeding material. After the feeding material is softened, keep it for a period of time to allow the secondary distribution of the feeding material and the rearrangement of the particles to achieve the filling of the mold. Stop heating, release the pressure after cooling, and take out the base and core rod to obtain a metal shell blank with a hollow core.

[0030] In a preferred solution, the pressure is applied to 20-60 MPa along the shell pressing direction, the temperature is raised to 120-170°C, and rheological pressing is performed for 10-40 minutes to obtain a metal shell blank.

[0031] In the present invention, the rheological pressing for 10 to 40 minutes refers to heating the temperature to 120 to 170° C. and maintaining the temperature for 10 to 40 minutes after the feed material is softened.

[0032] In a preferred embodiment, the sintering is carried out under a protective atmosphere, and the sintering process is: first heating to 400-600°C, keeping warm for 8-12 hours, then continuing to heat to K1, then cooling to K2, keeping warm for 4-6 hours, and then cooling to room temperature; wherein K1-K2 ≥ 50°C, preferably 100-150°C, K1 is 1300-1400°C, and K2 is 1150-1350°C.

[0033] The sintering process of the present invention first introduces circulating argon gas, raises the temperature to the degreasing temperature for degreasing, and then continues to raise the temperature to the melting temperature K1 of the inner core alloy to melt the inner core. At this time, the outer shell has not been completely sintered and dense. The gravity of the molten alloy itself and the capillary effect between the pores on the surface of the outer shell material are used to form a better solid-liquid interface wetting; then the temperature is lowered to K2 to solidify the core, and then through further insulation, the defects between the remaining pores and the interface are eliminated, and finally a dense outer shell and a stable electrical connection are obtained, and then the temperature is lowered to the sintering temperature of the metal outer shell, and finally cooled to room temperature.

[0034] Further preferably, the protective atmosphere is argon.

[0035] Further preferably, the cooling process is to first cool the temperature to 400-500°C at a cooling rate of <5°C / min, and then cool the temperature to room temperature in the furnace. Beneficial effects

[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 shells and electrical connections, which achieves near-net forming of special-shaped anode shells through rheological pressing, solving the problems of complex forming process, poor forming accuracy and low strength of formed blanks of large-sized aluminum electrolytic metal anodes.

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

[0039] (3) The present invention provides an integrated manufacturing method for aluminum electrolytic metal anode shells and electrical connections. The process is simple to operate and the flow is short. The obtained anode has high strength and high precision, which solves the contradiction that it is difficult to simultaneously achieve near-net forming and large-scale short-process manufacturing of complex-shaped anodes. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] FIG1 is a process flow chart of the present invention.

[0041] FIG2 is a schematic diagram of the mold structure of the present invention.

[0042] FIG3 is a schematic diagram of the anode structure of the present invention; 1 is the metal anode shell; 2 is the alloy core. Modes for Carrying Out the Invention

[0043] The following describes the preferred embodiments of the present invention in detail with reference to the accompanying drawings to make the advantages and features of the present invention more easily understood by those skilled in the art, thereby making a clearer and more precise 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 aluminum electrolysis Fe-Ni-Cu alloy anode housing and electrical connections

[0045] Step S1, using nano-grinding and airflow classification technology to obtain 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; the operating parameters of the turbine nano-sand mill are: speed 800 rpm, flow rate 60 L / H, zirconium bead filling ratio 60%; the operating parameters of the jet airflow classifier are: feed rate 60 kg / h, working pressure 10 MPa, and cyclone collector wind pressure 15 kPa;

[0046] Step S2: 4 kg of Fe powder, 5 kg of Ni powder, and 10 kg of Cu powder were added with a 30% by volume thermoplastic adhesive and mixed thoroughly to obtain a semi-solid hot material. The adhesive contained polyethylene glycol: polymethyl methacrylate: glycerol: dizinc phthalate in a volume ratio of 75%: 20%: 3%: 2%; the mixing temperature was 150° C., and the mixing time was 45 minutes.

[0047] Step S3, filling the feed material described in step S1 into a mold, and pressing the metal shell into shape by a rheological pressing method, specifically comprising the following sub-steps:

[0048] Sub-step A1: preheat the mold to 60°C and 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 punch, and fill the preheated mold feed into the material bin; connect the combined female mold A and the combined female mold B;

[0050] Sub-step A3: applying pressure to 60 MPa along the shell pressing direction, and continuously heating the mold to 160°C, and maintaining the pressure for 40 minutes after the feed material softens;

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

[0052] Step S4, filling the inner cavity after the core rod is removed with 4 kg of atomized Cu-20Ni-10Ti alloy powder with an average particle size of 50 μm, replacing the core rod and compacting at a pressure of 10 MPa to obtain an inert anode blank with an alloy inner core;

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

[0054] Sub-step B1, introducing circulating argon gas, raising the temperature to 500°C at a rate of 8°C / min, and maintaining the temperature for 10 hours;

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

[0056] Sub-step B3, cooling to 1150°C at a rate of 3°C / min and holding for 4 hours;

[0057] Sub-step B4: Continue to introduce argon gas, first cool down to 400°C at 5°C / min, and then cool to room temperature in the furnace.

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

[0059] Example 2: An integrated manufacturing method for aluminum electrolysis Fe-Ni-Cr alloy anode housing and electrical connections

[0060] In step S1, atomized Fe-50Ni-5Cr alloy powder is processed to an average particle size of 0.4 μm using nano-grinding and airflow classification technology; the operating parameters of the turbine nano-sand mill are: speed 800 rpm, flow rate 60 L / H, zirconium bead filling ratio 60%; the operating parameters of the jet airflow classifier are: feed rate 60 kg / h, working pressure 10 MPa, and cyclone collector pressure 15 kPa;

[0061] Step S2: 10 kg of Fe-50Ni-5Cr alloy powder was added with 40% by volume of a thermoplastic adhesive and mixed thoroughly to obtain a semi-solid hot material. The adhesive comprised polyethylene glycol, polymethyl methacrylate, glycerol, and dizinc phthalate in a volume ratio of 75%: 20%: 3%: 2%. The mixing temperature was 150° C. and the mixing time was 45 minutes.

[0062] Step S3, filling the feed material described in step S1 into a mold, and pressing the metal shell into shape by a rheological pressing method, specifically comprising the following sub-steps:

[0063] Sub-step A1: preheat the mold to 60°C and 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 punch, and fill the preheated mold feed into the material bin; connect the combined female mold A and the combined female mold B;

[0065] Sub-step A3: applying pressure to 60 MPa along the shell pressing direction, and continuously heating the mold to 160°C, and maintaining the pressure for 40 minutes after the feed material softens;

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

[0067] Step S4, filling the inner cavity after the core rod is removed with 4 kg of atomized Cu-20Ni-10Ag alloy powder with an average particle size of 50 μm, replacing the core rod and compacting at a pressure of 10 MPa to obtain an inert anode blank with an alloy inner core;

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

[0069] Sub-step B1, introducing circulating argon gas, raising the temperature to 500°C at a rate of 8°C / min, and maintaining the temperature for 10 hours;

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

[0071] Sub-step B3, cooling to 1150°C at a rate of 3°C / min and holding for 4 hours;

[0072] Sub-step B4: Continue to introduce argon gas, first cool down to 400°C at 5°C / min, and then cool to room temperature in the furnace.

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

[0074] Example 3: An integrated manufacturing method for aluminum electrolysis Fe-Ni-W-Mo alloy anode housing and electrical connections

[0075] Step S1, using nano-grinding and airflow classification technology to obtain Fe powder, Ni powder, W powder and Mo powder with an average particle size of 5 μm; the operating parameters of the turbine nano-sand mill are: speed 800 rpm, flow rate 60 L / H, zirconium bead filling ratio 60%; the operating parameters of the jet airflow classifier are: feed rate 60 kg / h, working pressure 10 MPa, cyclone collector pressure 15 kPa;

[0076] Step S2: 4 kg of Fe powder, 3 kg of Ni powder, 1.5 kg of W powder, and 1.5 kg of Mo powder were added to a 40% by volume thermoplastic adhesive and mixed thoroughly to obtain a semi-solid hot material. The adhesive contained polyethylene glycol: polymethyl methacrylate: glycerol: dizinc phthalate in a volume ratio of 75%: 20%: 3%: 2%; the mixing temperature was 150° C., and the mixing time was 45 minutes.

[0077] Step S3, filling the feed material described in step S1 into a mold, and pressing the metal shell into shape by a rheological pressing method, specifically comprising the following sub-steps:

[0078] Sub-step A1: preheat the mold to 60°C and preheat the feed to 80°C;

[0079] Sub-step A2: Install the mold, place the core rod fixing base and base platform; install the lower punch, and fill the preheated mold feed into the material bin; connect the combined female mold A and the combined female mold B;

[0080] Sub-step A3: applying pressure to 40 MPa along the shell pressing direction, and continuously heating the mold to 150°C, and maintaining the temperature for 40 minutes after the feed material softens;

[0081] Sub-step A4: stop heating, release the pressure after cooling, and remove the base and core rod.

[0082] Step S4, filling the inner cavity after the core rod is removed with 4 kg of atomized Cu-30Ni-20Co alloy powder with an average particle size of 50 μm, replacing the core rod and compacting at a pressure of 10 MPa to obtain an inert anode blank with an alloy inner core;

[0083] Step S5, placing the inert anode blank with the inner core described in step S3 in an atmosphere sintering furnace to complete degreasing, sintering and connection of the inner core, specifically includes the following sub-steps:

[0084] Sub-step B1, introducing circulating argon gas, raising the temperature to 500°C at a rate of 8°C / min, and maintaining the temperature for 10 hours;

[0085] Sub-step B2, continue heating at a rate of 5°C / min to 1400°C;

[0086] Sub-step B3, cooling to 1300°C at a rate of 3°C / min and holding for 4 hours;

[0087] Sub-step B4: Continue to introduce argon gas, first cool down to 400°C at 5°C / min, and then cool to room temperature in the furnace.

[0088] The final inert anode has an external dimensional accuracy of less than ±2.0mm / 100mm, the shell porosity after sintering is less than 5%, and the shear strength at the connection interface is 137MPa.

[0089] Comparative Example 1

[0090] Other conditions were the same as those in Example 1, except that the content of the thermoplastic adhesive in step S2 was 50%. As a result, the excessively high content of the adhesive could not be completely removed during the sintering process, resulting in severe cracking of the anode casing after sintering.

[0091] Comparative Example 2

[0092] Other conditions were the same as those in Example 1, except that the sintering in step S5 was performed by directly heating the temperature to 1400° C., holding the temperature for 4 h, and then cooling the temperature to room temperature. As a result, the alloy core separated from the shell due to solidification shrinkage.

[0093] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention's description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An integrated method for preparing an aluminum electrolytic metal anode housing and electrical connections, characterized in that: The 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, the mold is preheated to 60-100°C, and then the preheated metal shell feed particles are filled into the mold, pressurized, and the temperature is raised to 5-50°C above the softening point of the thermoplastic adhesive to rheologically press to obtain a metal shell blank, and the alloy core powder is filled into the core of the metal shell blank to obtain an inert anode blank with an alloy core, and the inert anode blank with an alloy core is sintered to obtain an inert anode for aluminum electrolysis.

2. The integrated preparation method of an aluminum electrolytic metal anode housing and electrical connection according to claim 1, characterized in that: The metal shell powder has the following composition by mass percentage: Ni 10-60%, M 5-30%, and the balance 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 shell powder is 0.05-1 μm; The metal shell powder is obtained by crushing and classifying the metal powder, wherein the crushing method is nano-grinding with a turbine nano-sand mill, and the working parameters of the nano-grinding are: a rotation speed of 580-1500 rpm, a flow rate of 50-500 L / H, and a zirconium bead filling ratio of 60-70%; The classification method is to use a jet airflow classifier for classification, and the working parameters during the classification are: feed rate 50~100kg / h, working pressure 1.5~20MPa, and cyclone collector wind pressure 1.5~20KPa.

3. The integrated preparation method of an aluminum electrolytic metal anode housing 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% to 80%.

4. The method for integrated preparation of an aluminum electrolytic metal anode housing and electrical connection according to claim 1, characterized in that: The thermoplastic adhesive is composed of the following by volume percentage: 60-94.5 vol% of filler adhesive, 5-30 vol% of backbone adhesive, 1-10 vol% of surfactant, and 0.5-5% of plasticizer; The melting index of the filling binder is ≥80 g / min, and the melting index of the backbone binder is ≥35 g / min.

5. The integrated preparation method of aluminum electrolytic metal anode housing and electrical connection according to claim 4, characterized in that: The filling 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 methyl cellulose. 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, 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 method for integrated preparation of an aluminum electrolytic metal anode housing and electrical connection according to claim 1, characterized in that: The mixing temperature is 120-200°C and the mixing time is 30-60min; The heating temperature during the crushing is 60-150° C., and the screw speed is 400-600 r / min.

7. The method for integrated preparation of an aluminum electrolytic metal anode housing and electrical connection according to claim 1, characterized in that: The particle size of the metal shell feed particles is -10 mesh to +200 mesh; the metal shell feed particles are preheated to 60-80° C.; The mold is a combined heatable mold, and the mold comprises a combined female mold A, a combined female mold B, an upper punch, a lower punch, a core rod, and a heating sleeve.

8. The method for integrated preparation of an aluminum electrolytic metal anode housing and electrical connection according to claim 1, characterized in that: The pressure is increased to 20-60 MPa along the shell pressing direction, and the temperature is raised to 120-170°C. The metal shell blank is obtained by rheological pressing for 10-40 minutes.

9. The method for integrated preparation of an aluminum electrolytic metal anode housing and electrical connection according to claim 1, characterized in that: The sintering is carried out under a protective atmosphere. The sintering process is: firstly heating to 400-600°C, keeping the temperature for 8-12 hours, then continuing to heat to K1, then cooling to K2, keeping the temperature for 4-6 hours, and then cooling to room temperature; Among them, K1-K2≥50℃, K1 is 1300~1400℃, and K2 is 1150~1350℃.

10. The integrated preparation method of aluminum electrolytic metal anode housing and electrical connection according to claim 9, characterized in that: The protective atmosphere is argon; The cooling process is to first cool the temperature to 400-500°C at a cooling rate of <5°C / min, and then cool to room temperature in the furnace.

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