The invention discloses a preparation method for
microwave-absorbing ferrite. The preparation method comprises the following steps: S1, adding Mn(NO3)2.4H2O, Zn(NO3)2.6H2O, Fe(NO3)3.9H2O to water and dissolving, adding cetyl trimethyl
ammonium bromide and uniformly mixing, dropwise adding
sodium hydroxide water solution until pH is equal to 10.5-11.5, continuously stirring in the dropwise adding process, raising the temperature to 70-75 DEG C, and keeping the temperature for 2.5-3 h, filtering and taking a
filter cake, calcining, and ball-milling to obtain nano-ferrite; and S2, adding the nano-ferrite obtained in the step S1 to ethyl
alcohol, and uniformly dispersing to obtain ferrite
sol; uniformly mixing
zinc acetate and the ethyl
alcohol, to obtain solution A by the
ultrasound treatment; adding ferrite
sol to the solution A, uniformly mixing, performing the
ultrasound treatment, raising the temperature, dropwise adding the
sodium hydroxide water solution, keeping the temperature and stirring, filtering and taking the
filter cake, washing, regulating the temperature, to obtain the
microwave-absorbing ferrite by the
vacuum drying.