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A kind of preparation method of iron oxide for hard magnetic material

A technology of hard magnetic materials and iron oxide, which is applied in the direction of iron oxide, iron oxide/iron hydroxide, and the magnetism of inorganic materials, and can solve problems such as ineffective treatment of green vitriol

Active Publication Date: 2016-02-03
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the defects that a large amount of green vitriol can be produced by-product by sulfuric acid method to prepare titanium dioxide, and the prior art cannot effectively process these green vitriol, and provide a kind of iron oxide for hard magnetic materials prepared by adopting vitriol preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This example is used to illustrate the preparation method of iron oxide for hard magnetic materials provided by the present invention.

[0026] The green vitriol was centrifuged in a centrifuge to remove free water, and the obtained solid product was placed in an oven, and then dried at constant temperature at 60°C, 120°C and 350°C for 1 hour to remove crystal water. Then the product after removal of crystal water is placed in a box-type resistance furnace and the temperature is raised to 750° C. for calcination at a constant temperature for 1 hour. 2 :8.12% by volume, SO 3 : 9.15% by volume) to prepare concentrated sulfuric acid according to the traditional method, and the obtained first calcined solid product was washed with water at 20°C for 2.5 hours (the weight ratio of the first calcined solid product to water was 0.4:1) and then filtered, The solid product obtained after washing with water was calcined at 880°C for 1 hour to obtain iron oxide T1 for hard magneti...

Embodiment 2

[0028] This example is used to illustrate the preparation method of iron oxide for hard magnetic materials provided by the present invention.

[0029] The green vitriol was centrifuged in a centrifuge to remove free water, and the obtained solid product was placed in an oven, and then dried at constant temperature at 80°C, 100°C and 300°C for 2 hours to remove crystal water. Then the product after removal of crystal water is placed in a box-type resistance furnace and the temperature is raised to 800° C. for calcination at a constant temperature for 1.5 hours. 2 :8.56% by volume, SO 3 :8.37% by volume) to prepare concentrated sulfuric acid according to the traditional method, and the obtained first calcined solid product was washed with water at 30°C for 2 hours (the weight ratio of the first calcined solid product to water was 0.3:1) and then filtered, The solid product obtained after washing with water was calcined at 900°C for 1.5 hours to obtain iron oxide T2 for hard mag...

Embodiment 3

[0031] This example is used to illustrate the preparation method of iron oxide for hard magnetic materials provided by the present invention.

[0032] The green vitriol was centrifuged in a centrifuge to remove free water, and the obtained solid product was placed in an oven, and then dried at constant temperature at 70°C, 110°C and 320°C for 1.5 hours respectively to remove crystal water. Then the product after removal of crystal water is placed in a box-type resistance furnace and the temperature is raised to 780°C for constant temperature calcination for 1.3 hours. 2 :8.38vol%, SO 3 :8.51% by volume) according to the traditional method to prepare concentrated sulfuric acid, and the obtained first calcined solid product was washed with water at 35°C for 2.3 hours (the weight ratio of the first calcined solid product to water was 0.35:1) and then filtered, The solid product obtained after washing with water was calcined at 890°C for 1.3 hours to obtain iron oxide T3 for hard...

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Abstract

The invention provides a preparation method of iron oxide used for a hard magnetic material, and the method includes removal of crystal water in copperas, first calcination of the crystal water-removed copperas at 750-800 DEG C, washing of the first calcined product with water to remove soluble metal salts, and second calcination of the water washed product at 880-900 DEG C. By use of the preparation method, impurities in the copperas can be very effectively removed, the obtained iron oxide is very suitable for the preparation of the hard magnetic material, the purpose of turning waste into treasure of the copperas can be realized, the problem that a large number of copperas cannot be effectively processed by the prior art can be solved, and the preparation method has very good industrial application prospect.

Description

technical field [0001] The invention relates to a preparation method of iron oxide used for hard magnetic materials. Background technique [0002] Titanium dioxide is an excellent white pigment, which is widely used in paints, coatings, paper, plastics and welding electrodes and other industries. [0003] At present, the processes for producing titanium dioxide mainly include the sulfuric acid method and the chlorination method. The two processes coexist, and the production capacity and output are very large. However, both production processes have certain environmental pressures. For the sulfuric acid production process, a large amount of hydrolysis waste acid and green vitriol (FeSO 4 ·7H 2 o). When titanium concentrate (the main component is iron metatitanate FeTiO 3 , wherein the content of titanium dioxide is 45-50% by weight) as the raw material, generally producing 1 ton of titanium dioxide will produce 3.5-4 tons of heptahydrate green vitriol. [0004] Green vi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/06H01F1/10
Inventor 穆宏波穆天柱邓斌赵三超闫蓓蕾朱福兴彭卫星
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP