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Method for synthesizing hercynite

A ferroaluminum spinel and synthesis method technology, applied in the direction of alumina/aluminum hydroxide, etc., can solve the problems of high synthesis cost by electrofusion method and difficult to control the atmosphere conditions of sintering method, and achieve low cost, reduced energy consumption, The effect of easy synthesis conditions

Active Publication Date: 2012-07-18
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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Problems solved by technology

[0004] Aiming at the problems that the atmosphere conditions of the sintering method are not easy to control and the synthesis cost of the electrofusion method is high in the synthesis methods of iron-aluminum spinel at home and abroad, the purpose of the present invention is to propose a synthesis method of iron-aluminum spinel

Method used

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  • Method for synthesizing hercynite
  • Method for synthesizing hercynite

Examples

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Effect test

Embodiment 1

[0022] Using industrial grade iron oxide powder (particle size 100 mesh), industrial grade metal aluminum powder (particle size 150 mesh), industrial grade activated alumina micropowder (particle size 1100 mesh) as raw materials, the mass percentages are 42%, 5.2%, 52.8% respectively proportional weight. The raw materials were kneaded at a speed of 50r / min for 10h in a ball mill, and the uniformly mixed powder was pressed into a block sample with a 4MPa molding press, and then dried in an oven at 80°C for 24h. The dried samples were placed in a vacuum furnace, the pressure in the furnace was 20Pa, and they were sintered at 1500°C for 3h. The phase composition of the sample detected by XRD is pure iron-aluminum spinel ( figure 1 ).

Embodiment 2

[0024] Using industrial grade iron oxide powder (particle size 200 mesh), industrial grade metal aluminum powder (particle size 540 mesh), industrial grade activated alumina micropowder (particle size 1500 mesh) as raw materials, the mass percentages are 40%, 4.4%, 55.6% respectively proportional weight. The raw materials were kneaded at a speed of 160r / min for 2 hours in a ball mill, and the uniformly mixed powder was pressed into a block sample with a 1MPa molding press, and then dried in an oven at 110°C for 8 hours. The dried samples were placed in a vacuum furnace with an air pressure of 15 Pa and sintered at 1300°C for 3 hours. The phase composition of the sample detected by XRD is pure Fe-Al spinel.

Embodiment 3

[0026] Using industrial grade iron oxide powder (particle size 325 mesh), industrial grade metal aluminum powder (particle size 650 mesh), industrial grade activated alumina micropowder (particle size 900 mesh) as raw materials, the mass percentages are 44%, 5.8%, 50.2% respectively proportional weight. The raw materials were kneaded for 1 h at a speed of 200 r / min in a ball mill, and the uniformly mixed powder was pressed into a block sample with a 10 MPa molding press, and then dried in an oven at 90 °C for 10 h. The dried samples were placed in a vacuum furnace with an air pressure of 50 Pa, and were sintered at 1400° C. for 0.5 h. The phase composition of the sample detected by XRD is pure Fe-Al spinel.

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Abstract

The invention belongs to the technical field of preparation of materials and particularly relates to a method for synthesizing hercynite. Ferric oxide powder, aluminium metal powder and activated aluminium oxide powder are taken as raw materials and are synthesized into hercynite in a vacuum furnace through a solid-state sintering method, reduction is carried out on ferric oxide by metallic aluminium to generate aluminum oxide and metallic iron, excessive ferric oxide and metallic iron react to generate ferrous oxide, and finally ferrous oxide, generated aluminum oxide and added activated aluminium oxide react to generate hercynite. The method has the characteristics that the generation condition of the ferrous oxide is met through the reduction action of metallic aluminium on ferric oxide, a weak reducing atmosphere does not need to be controlled, and purified hercynite can be sintered in a vacuum condition, so that the rigorous requirement that the weak reducing atmosphere needs to be controlled when ferric oxide and aluminum oxide, serving as the raw materials, are sintered is avoided, and the technology is easy to control; and at the same time, large amount of heat radiated from the reduction reaction of ferric oxide by metallic aluminium can provide partial energy required by reaction, thereby reducing energy consumption.

Description

technical field [0001] The invention relates to a method for synthesizing iron-aluminum spinel, which belongs to the technical field of material preparation. Background technique [0002] With the increasing awareness of environmental protection, it is necessary to develop environmentally friendly products to adapt to industrial production and development. For the lining material for cement rotary kiln, due to the rotation of the high-temperature kiln body and the continuous wear of clinker, the lining material must have good structural flexibility. The commonly used magnesia-chrome bricks cause serious pollution to the environment due to the production and use of hexavalent chromium poisonous substances. Therefore, in recent years, magnesia-iron-aluminum spinel refractory bricks have been researched and developed. During use, the Fe-Al spinel decomposes, Fe 2+ Ions diffuse into the surrounding MgO matrix, while part of the Mg 2+ The ions diffuse into the iron-aluminum sp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02C04B35/66
Inventor 袁波王来稳李红霞王刚李代兵
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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