JPS60215529A - Production of ferrite raw material - Google Patents

Abstract

PURPOSE:To produce a high-quality ferrite raw material in high efficiency at a low cost, by drying the wet mixture of a ferromanganese oxide powder and iron oxide powder, and calcining the dry mixture after pelletization. CONSTITUTION:(A) The powder of ferromanganese oxide obtained by the air oxidation of ferromanganese (composed of about 70-80wt% Mn and the rest part composed mainly of Fe) used as a deacidifying agent in a steel mill, is mixed with (B) powdery iron oxide in wet state, and the mixture is pelletized after drying at 100-600 deg.C. The obtained pellet is calcined at 500-1,400 deg.C to obtain the objective ferrite raw material. The above powdery mixture may be mixed further with the powder prepared by the wet mixing of zinc oxide, magnesium oxide, nickel oxide, etc., before pelletization.

Description

Detailed Description of the Invention (Industrial Field of Application and Object of the Invention) The present invention is a method for producing a ferrite raw material, and its purpose is to produce a high-precision ferrite raw material at low cost and with high efficiency. The purpose is to provide a method for manufacturing.

(Prior Art) Ferrite is used in high-frequency magnetic cores (such as heads) used in televisions, radios, and various other communication devices.

In addition to ferrite powder (transformers, cathode ray tubes, deflection yokes, etc.), ferrite powder is mixed into paints, etc., and is widely used as materials for eliminating radio interference.

The high-frequency magnetic core mentioned above uses ferrite with various compositions depending on the various magnetic properties required, but the composition is mainly iron oxide, manganese oxide, zinc oxide, and magnesium, nickel, etc. MOFe203 (M
is a divalent metal).

A typical method for industrially manufacturing ferrite as described above is to mix and mold oxide powders of the various components described above, calcinate this in an oxidizing atmosphere, and then crush it to obtain a ferrite raw material, which is then molded. However, this method requires preliminary firing before the oxides react with each other and become ferrite.

Both main firings have the disadvantage of requiring several hours of heating.

Conventionally, manganese dioxide, the raw material for manganese oxide, is obtained by dissolving manganese ore in sulfuric acid and electrolyzing it.Manganese carbonate is still produced by dissolving manganese ore in sulfuric acid, adding alkali, and dehydrating and drying the precipitate. Shimata is used.

However, the former method requires a large amount of electricity during electrolysis, the latter is a wet reaction, which complicates the process, and both methods use expensive raw materials, making them uneconomical and still inefficient. There is a drawback.

As a result of research aimed at improving the above-mentioned conventional drawbacks, the inventors of the present invention have found that a method for manufacturing high-precision ferrite raw materials at low cost and with high efficiency can be obtained by adopting the configuration described in the claims. I was able to do it.

(Means for solving the problem) That is, the invention described in claim 1 (hereinafter referred to as the first invention) wet-mixes ferromanganese oxide powder and iron oxide powder, This is a method for producing a ferrite raw material, which is characterized by drying at ~6008C, then forming into pellets, and heating at 500~1400C. The invention is based on ferromanganese oxide powder, iron oxide powder, and zinc oxide.

It is characterized by adding one or more powders of magnesium oxide and nickel oxide, wet mixing, drying at 100 to 600°C, forming into pellets, and heating at 500 to 1400°C. This is a method for producing ferrite raw materials.

(Operation and Effect) To further explain the present invention in detail, the ferromanganese oxide powder used in the present invention is used as a deoxidizing agent during steel production, consisting of 70 to 80% Mn and the remainder mainly Fe. It is a powder made by oxidizing this ferromanganese.

The ferromanganese oxide powder described above can be obtained by wet mixing a mixture of ferromanganese powder and iron oxide powder in an atmosphere of an oxidizing gas such as air or oxygen. In this case, instead of using an oxidizing gas atmosphere, an oxidizing agent may be mixed into the mixture to oxidize, as long as it does not affect the composition of the product ferrite. However, when producing ferromanganese oxide, ferromanganese may be wet-pulverized in an oxidizing gas atmosphere in the same manner as described above, and then wet-mixed with iron oxide powder.

As described above, by wet mixing or wet pulverizing ferromanganese, the activity of the oxide is improved and a uniform product with no variation in activity is obtained. Therefore, the final product obtained by the present invention has no local differences. It has no orientation and can be obtained as a magnetic material with uniform properties.

Approximately 70% of the ferromanganese powder is oxidized by the wet mixing, but in the present invention, the mixture is oxidized at 100 to 600°.
Heat to C and crush. As a result, unoxidized ferromanganese in the mixture is completely oxidized to obtain a powder mixture of ferromanganese oxide and iron oxide.

In addition, during the wet mixing, combustible gases such as hydrogen and methane are generated due to the oxidation reaction of ferromanganese. All you have to do is exhaust the flammable gas.

A binder such as polyvinyl alcohol (PVA) is added to the wet-mixed product as described above, and the pellets are formed into pellets with an appropriate diameter.
Heat at 0'C. By forming ferromanganese oxide powder and iron oxide powder into pellets in this way, powdering is prevented, uniform heating is achieved, and therefore it does not melt even at high temperatures, making it possible to obtain a highly accurate ferrite raw material. can.

However, the second invention is to add two or more of zinc oxide, magnesium oxide, and iron oxide to ferromanganese powder and iron oxide powder during wet mixing, and in this case, What is added and blended does not necessarily have to be metal oxides, and may be various metal salts that can generate metal oxides during oxidative roasting. Various types of highly accurate ferrite containing magnesium oxide, nickel oxide, etc. can be produced at low cost and with high efficiency.

Example 1 300 ml of water was added to 300 y of coarse ferromanganese particles containing Mn 74.1% and Fe 8.6%, and while air was introduced from one side and gas in the system was discharged from the other, a vibrating mill was used. Grind for 5 hours. Fe203 is added to the crushed slurry.
Add 600 y and 600 m/+ of water and wet mix.

Next, 0 PVA was added to the powder obtained by drying at 400°C.
．． Add 1% to make pellets and heat at 1000°C for 2 hours to obtain a ferrite raw material.

This was further wet-pulverized for 3 hours, dehydrated and dried to form a powder.
0.5% of PVA was added as a binder to this, molded into a ring shape, heated at 1280°C for 3 hours, and then cooled in a nitrogen stream. The characteristics of this sample at room temperature are shown in Table 1.

Table-1 Example 2 Mn? 4.1. %, Fe 1 B, 6% Fe 0 manganese coarse particles 210g and water 210mA! Add
Grind with a vibrating mill in the same manner as in Example 1. Fe203660f, Zn095f and 750ml of water were added to the crushed slurry.
was added and wet mixed to obtain a ferrite raw material in exactly the same manner as in Example 1, molded into a ring shape, heated at 1330° C. for 2 hours, and then cooled in a nitrogen stream. The characteristics of this sample at room temperature are shown in Table 2.

Table 2 Example 3 250y of ferromanganese coarse particles with Mn 72.1% and Fe 18.7% and 700y of iron oxide powder with a purity of 99.3%
and 75y of zinc white with a purity of 99.7% and 800ml of water
were pulverized and mixed using a vibrating mill in exactly the same manner as in Example 1.

The obtained mixture was dried by heating in the same manner as in Example 1, and then formed into pellets with a diameter of 2 to 4 mm, and then heated in an electric Matsufuru furnace at 9.00° C. for 2 hours to obtain a ferrite raw material.

Next, this was rapidly cooled to room temperature (cooling for about 30 minutes), then ground to an average particle size of 1.5 microns, formed into a ring shape using PVA as a binder, heated at 1350°C for 2 hours, and then placed in a nitrogen stream. Cooled. The magnetic properties of this sample were measured and were found to be μ1ac2800, B, and o5200 Gauss. This value is equivalent to the general value of Mn-Zn ferrite used in flyback transformers for televisions.

Patent Applicant Japan Heavy Chemical Industry Co., Ltd. Agent Rikichi Ichikawa (11) Procedural Amendment (Method) % Formula % 1. Indication of the case 1982 Patent Application No. 71441 2. Name of the invention Method for producing ferrite raw material 3. Person making the amendment 5. Date of the amendment order: July 11, 1980 As per the engraving and attached sheet of the specification originally attached to the application (with various changes in content)

Claims (2)

[Claims] (1) Production of ferrite raw material characterized by wet mixing ferromanganese oxide powder and iron oxide powder, drying at 100 to 600°C, forming into pellets, and heating at 500 to 1400°C. Law. (2) Ferromanganese oxide powder and iron oxide powder,
Furthermore, 1 of zinc oxide, magnesium oxide, and nickel oxide
Wet mix by adding seeds or two types of powder, and add 100-60
After drying at 0°C, it is formed into pellets and
A method for producing a ferrite raw material, characterized by heating at 00°C.