Process for preparing MnZn soft magnetic ferrite particles

Abstract

The method includes steps: (1) under certain temperature and acidity, using industrial waste scrap iron and industrial sulfuric acid to produce ferrous sulfate; (2) using chemical subtraction including crystallizing and special type flocculant, and superfine filtering technique to remove harmful impurities; (3) mixing ferrous sulfate, manganese sulfate, and zinc sulfate, and using ammonium bicarbonate as precipitator; adopting chemical coprecipitation method to produce deposits of ferric carbonate, manganese carbonate, and zinc carbonate; (4) through washing, filtering, spray drying, and heat treating procedures to produce grain material of MnZn soft-magnetic ferrite. Removing SiO2 and Al2O3 etc harmful impurities effectively, the method produces soft-magnetic ferrite with indexes of technical performance including high purity, stable capabilities, magnetic permeability, and power waste reaching to operational requirement of users.

Description

technical field [0001] The invention relates to a method for preparing manganese-zinc soft magnetic ferrite granular material. Background technique [0002] At present, there are mainly the following methods for preparing manganese zinc soft ferrite: [0003] 1. Oxide method (dry method): also known as ceramic technology, it is based on metal oxide Fe 2 o 3 , Mn 3 o 4 , ZnO, etc. as raw materials, through mixing, coarse grinding, pre-calcination, fine grinding and granulation, forming and sintering processes to produce soft ferrite materials. Because this process uses solid raw materials, the physical properties of the three raw materials are quite different, so it is difficult to mix evenly, resulting in unstable performance of the produced soft ferrite material, high cost, and certain dust pollution during the production process. . [0004] 2. Chemical co-precipitation method: This method is based on metal sulfate, nitrate or chloride as raw material, and inorganic a...

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Problems solved by technology

The disadvantage is that the process is long

[0005] 3. Luxner method: it is based on the waste hydrochloric acid pickling solution (FeCl 2 ), MnCl 2 and ZnCl 2 As the raw material, it enters the high-temperature reactor after being atomized through the nozzle, so that the water in the solution is volatilized, and the FeCl 2 , MnCl 2 and ZnCl 2 Direct oxidation to MnO ZnO Fe at high temperature 2 o 3 ; and the volatile Cl 2 The water absorption method can be recycled into hydrochloric acid for reuse; due to the strong corrosiveness of hydrochloric acid, the production equipment structure of this method is complicated, the investment is huge, the supporting equipment is many, and the pollution is serious; another disadvantage is that ZnO, ZnCl 2 It is easy to volatilize and cause large deviations in composition

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