Method for producing ferric oxide for permanent magnet presintered material

A production method and calcined material technology are applied in the field of production of iron oxide for permanent magnet calcined material, can solve the problems of high cost, poor product performance, complicated process and the like, and achieve low production cost, simple and reliable production process, No secondary pollution effect

Active Publication Date: 2005-07-20
宝武环科南京资源利用有限公司
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Problems solved by technology

[0002] Iron oxide is the main raw material for the production of permanent magnet pre-fired materials. Its performance and price ratio directly affect the development of the permanent magnet industry. At present, the iron oxide used for permanent magnet pre-fired materials mainly comes from the following two aspects: 1. Using iron Iron oxide is produced by chemical methods such as adding acid to dissolve raw materials or pickling waste liquid in the iron and steel industry; 2. Ultra-pure iron concentrate and rolled steel scale.

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  • Method for producing ferric oxide for permanent magnet presintered material

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Embodiment Construction

[0016] Referring to the accompanying drawings, a production method of iron oxide for permanent magnet calcined materials uses iron scale solid waste in the production process of hot rolling mills as raw material, and the raw material is first dried and dehydrated. No stickiness, no cake formation, improve grinding efficiency; Mechanical method is used to remove mechanical foreign matter in raw materials before fine grinding; The processed raw materials are finely ground, and the grinding method is dry continuous operation, which requires uniform fine grinding output The particle size is below 5um; the finely ground material is heated externally with gas, oxidized with air, the oxidation temperature is 720°C, and the oxidation time is 70 minutes; it can be sold as iron oxide for magnetic materials. Compared with the existing technology, the production process of the present invention is simple and reliable, with low material consumption and energy consumption, no secondary pollu...

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Abstract

The present invention relates to the production process of ferric oxide for presintered permanent magnetic material. Waste iron scale from hot rolling mill as material is processed through the steps of stoving, eliminating impurity, grinding, cooling, etc. to produce the red brown ferric oxide material of average particle size 5 micron, Fe2O3 content 99.0 %, and ferrous oxide content less than 0.20 %. Compared with available technology, the present invention has the advantages of simple and reliable production process, low material and power consumption, no secondary pollution, low product cost and high product quality.

Description

1. Technical field [0001] The invention relates to a method for producing iron oxide, in particular to a method for producing iron oxide for permanent magnet calcined material. 2. Background technology [0002] Iron oxide is the main raw material for the production of permanent magnet pre-fired materials. Its performance and price ratio directly affect the development of the permanent magnet industry. At present, the iron oxide used for permanent magnet pre-fired materials mainly comes from the following two aspects: 1. Using iron Iron oxide is produced by chemical methods such as adding acid to dissolve raw materials or pickling waste liquid in the iron and steel industry; 2. Ultra-pure iron concentrate and rolled steel scale. . 3. Contents of the invention [0003] In order to obtain high-performance and low-cost iron oxide for permanent magnet calcined material, the present invention proposes a dry oxidation production process. [0004] A method for producing iron oxi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622H01F1/10
Inventor 汪文生陈家立王勇金建荣范伟吕财保陶先强
Owner 宝武环科南京资源利用有限公司
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