Preparation method for aluminum electrolysis metal anode

An integrated preparation method for aluminum electrolysis metal anode shell and electric connection, comprising:

• mixing a metal shell powder with a thermoplastic binder to obtain a semisolid hot mixture;
• crushing the semisolid hot mixture to obtain metal shell feedstock granules;
• preheating a mold to a temperature 20-50° C. higher than a softening point temperature of the thermoplastic binder, filling preheated metal shell feedstock granules into the mold, applying pressure and heating to a temperature 5-50° C. higher than the softening point temperature of the thermoplastic binder, and performing a rheological pressing to obtain a metal shell green body;
• filling an alloy inner core powder into a core part of the metal shell green body to obtain an inert anode green body with an alloy inner core;
• and
• sintering the inert anode green body with the alloy inner core to obtain an integrated inert anode for aluminum electrolysis metal anode shell and electric connection;
• wherein
• the metal shell powder, in mass percentage, has a composition as follows:
• 10-60% of Ni, 5-30% of M, and a balance of Fe, wherein M is selected from at least one of Cu, Co, Cr, Mn, Al, Ag, Zn, Ti, Sn, W, Mo, Zr, or Nb;
• a particle size of the metal shell feedstock granules is within a range of −10 mesh to +200 mesh;
• the metal shell feedstock granules are preheated to 60-80° C., and the mold is preheated to 60-100° C.;
• a pressure of 20-60 MPa is applied along a shell pressing direction, and a temperature is increased to 120-170° C., and the rheological pressing is performed for 10-40 min to obtain the metal shell green body;
• and
• the sintering is performed in a protective atmosphere, and a process of the sintering includes:
• first increasing a temperature to 400-600° C., holding for 8-12 h, then further increasing the temperature to K1, then decreasing the temperature to K2, holding for 4-6 h, and cooling to a room temperature;
• wherein K 1-K2≥50° C., K1 is 1300-1400° C., and K2 is 1150-1350° C.