Method for improving Bs of MnZn power ferrite material by moving valley point

A method for improving saturation flux density (Bs) of an MnZn power ferrite material by moving a valley point, comprising the following steps:

• 1) mixing Fe2O3, MnO and ZnO, and performing a primary sanding to obtain a first sanded material, wherein the proportions of the components are 52.9-53.3 mol % of Fe2O3, 38.3-39.08 mol % of MnO, and 7.62-8.8 mol % of ZnO;
• 2) adding a glue to the first sanded material, performing a first spraying and a first granulating to obtain a material to be pre-sintered, and then performing a pre-sintering to obtain a pre-sintered material;
• 3) adding additives to the pre-sintered material, and performing a secondary sanding to obtain a secondary sanded material, wherein the additives consist of the following components in mass percentages accounting for the pre-sintered material:
• 0.03-0.08 wt % of CaCO3, 0.015-0.04 wt % of ZrO2, 0.43-0.52 wt % of Co2O3, and 0.05-0.2 wt % of SnO2;
• and
• 4) adding the glue to the secondary sanded material, performing a second spraying and a second granulating, pressing into a standard ring, and then performing sintering.