Method for preparing porous ceramic with uniform micro-nano pores

A method for preparing a porous ceramic with micro-nano pores, comprising the following steps:

• 1) mixing a gelling agent, a surfactant, and water while stirring to produce a homogeneous solution;
• 2) feeding the homogeneous solution into a micro-nano bubble generator, subjecting the homogeneous solution to circularly flow under aeration, and conducting ejection to produce a micro-nano gel foam, wherein a rate of the circular flow is 2 liters/minute to 20 liters/minute, and the aeration is conducted for 5 minutes to 10 minutes with a gas flow rate of 100 millilitres/minute to 250 millilitres/minute;
• 3) adding a mineral powder to the micro-nano gel foam, stirring for 10 minutes to 30 minutes at a speed of 1,000 revolutions/minute to 1,400 revolutions/minute to produce a slurry-gel foam, adding a curing agent to the slurry-gel foam, and stirring for 15 minutes to 30 minutes at a high speed of 1,000 revolutions/minute to 1,400 revolutions/minute to produce a stabilized slurry-gel foam;
• and
• 4) subjecting the stabilized slurry-gel foam to injection molding, curing, demolding, drying, and sintering in sequence to produce the porous ceramic.