▎ 摘　　要

NOVELTY - Preparation of permanent magnet ferrite involves (S1) pre-mixing oxide and carbonate powders according to calcium-iron-metal-zinc oxide to form premix, and mixing using a rolling ball mill to obtain a mixture, (S2) filtering and drying the mixture to remove moisture, spreading the mixture in a sintering bowl of roller kiln, and pre-burning to obtain a rare earth-free doped permanent magnet ferrite pre-burnt material, (S3) roughly crushing in a vibrating crusher to obtain a roughly crushed pre-burnt powder, adding surfactant and additives, crushing and mixing to obtain slurry, (S4) filtering slurry to ensure the water content to be 35-45%, and using wet pressing magnetic field to carry out orientation pressing to obtain a green component, (S5) sintering the green component to obtain a sintered magnet in an air oxidizing atmosphere at heating rate of 20-400℃/hour, and (S6) cooling sintered magnet, surface-grinding to obtain measurable standard block, inspecting, and measuring. USE - Preparation of permanent magnet ferrite (claimed) used in electronic device. ADVANTAGE - The method enables to prepare permanent magnetic ferrite, which is rare earth-free and noble metal-doped permanent magnet ferrite. DETAILED DESCRIPTION - Preparation of permanent magnet ferrite involves (S1) pre-mixing oxide and carbonate powders according to calcium-iron-metal-zinc oxide of formula: R1-xCaxFe2n-y-zMyZnzO19, where x is 0.1-0.7, y is 0-0.5, z is 0-0.3, n is 5.2-6.5, R is one or more of barium, strontium and lead, and M is one or more of chromium, aluminum and titanium to form premix, and mixing using a rolling ball mill to obtain a mixture, (S2) filtering and drying the mixture to remove moisture, spreading the mixture in a sintering bowl of roller kiln, and pre-burning at 1100-1300℃ for 0.5-4 hours to obtain a rare earth-free doped permanent magnet ferrite pre-burnt material, (S3) pulverizing, roughly crushing in a vibrating crusher to obtain a roughly crushed pre-burnt powder with average particle size of 2-6 μm, adding surfactant and additives, crushing and mixing using a roller ball mill to obtain slurry with the average particle size of 0.6-1.0 μm, (S4) filtering the slurry to ensure the water content to be 35-45%, and using wet pressing magnetic field to carry out orientation pressing at pressure of 7-9 MPa and pulse magnetic field of 6-10 KOe to obtain a green component with diameter of 34.1 mm and height of 14-16 mm, (S5) sintering the green component in the roller kiln at 950-1300℃ for 0.5-3 hours to obtain a sintered magnet in an air oxidizing atmosphere at heating rate of 20-400℃/hour, and (S6) cooling the sintered magnet to room temperature, carrying out surface grinding to obtain measurable standard block, inspecting, and measuring to GB/T3217-92national standard. An INDEPENDENT CLAIM is included for permanent magnet ferrite.