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Hercynite and preparing method thereof

The technology of iron-aluminum spinel and aluminum compound is applied in the field of refractory materials, which can solve the problems of high price and high energy consumption, and achieve the effects of easy operation, simple synthesis process and avoidance of volume effect.

Inactive Publication Date: 2014-10-01
ZIBO CITY LUZHONG REFRACTORIES CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The iron-aluminum spinel used in foreign countries for magnesia refractories containing iron-aluminum spinel is produced by electric melting, but the energy consumption is high and the price is expensive.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] According to the mass ratio of Fe rolled steel fine powder and industrial alumina powder 2 o 3 :Al 2 o 3 For 44:56, carry out batching, co-grinding, and then add 3% phenolic resin for mixing. After being shaped and dried by a press, it enters a high-temperature kiln to heat up; it is kept in a high-temperature kiln at 1600 ° C for 5 hours in a carbon-reducing atmosphere, and then it is naturally cooled and taken out.

[0021] The particle sizes of alumina-containing raw materials and iron-containing raw materials are all below 160 mesh.

[0022] The described atmosphere is an air-buried carbon atmosphere.

[0023] The refractory material synthesized in this embodiment is detected by X-ray diffraction, FeAl 2 o 4 The mass composition is 99%.

Embodiment 2

[0025] According to the iron oxide red fine powder and aluminum hydroxide powder according to the mass ratio of Fe 2 o 3 :Al 2 o 3 40:60 for batching co-grinding, and then add 2% phenolic resin mixing. After being formed and dried by a press, it enters a high-temperature kiln to heat up; in the high-temperature kiln, it is kept at 1500°C in a reducing atmosphere with air buried carbon for 4 hours, and then it is naturally cooled and taken out.

[0026] The particle sizes of alumina-containing raw materials and iron-containing raw materials are all below 160 mesh.

[0027] The described atmosphere is an air-buried carbon atmosphere.

[0028] The refractory material synthesized in this embodiment is detected by X-ray diffraction, and the phase FeAl 2 o 4 The weight fraction of the corundum phase is 90%, and the mass fraction of the corundum phase is 10%.

Embodiment 3

[0030] According to the mixture of iron oxide red fine powder and elemental iron and corundum aluminum powder according to the mass ratio of Fe 2 o 3 :Al 2 o 3 Dosing for 38:62, co-grinding, and then adding 4% dextrin for mixing. After being shaped and dried by a press, it enters a high-temperature kiln to heat up; in the high-temperature kiln, it is kept at 1550°C in a reducing atmosphere with air buried carbon for 7 hours, and then it is naturally cooled and taken out.

[0031] The particle sizes of alumina-containing raw materials and iron-containing raw materials are all below 160 mesh.

[0032] The described atmosphere is an air-buried carbon atmosphere.

[0033] The refractory material synthesized in this embodiment is detected by X-ray diffraction, and the phase FeAl 2 o 4 The weight fraction of the corundum phase is 85%, and the mass fraction of the corundum phase is 15%.

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Abstract

The invention belongs to the technical field of fireproofing materials, and relates to hercynite and a preparing method thereof. The chemical components of the hercynite are Fe2O3 and Al2O3, wherein mass proportion of the Fe2O3 to Al2O3 is (35 to 44) to (65 to 56); the chemical components are calculated on the foundation that the FeO is converted into Fe2O3. According to the hercynite, volume effect due to that iron changes among different valence states is avoided; the synthetic process is simple to carry out easily. According to the advantage of the preparing method, compared with an N2 atmosphere realizing by an enclosed condition, utilizing a reducing atmosphere which adopts air to bury carbon is very easy to operate.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and relates to an iron-aluminum spinel and a preparation method thereof. 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, it is required that the lining material must have good structural flexibility. The commonly used magnesia-chrome bricks cause serious pollution to the environment due to the generation of toxic hexavalent chromium in the process of production and use. [0003] The synthesis of iron-aluminum spinel both at home and abroad adopts sintering method or electrofusion method. For the synthesis of iron-aluminum spinel by the sintering method, the general formula is to use metallic iron and alumina as starting materials. The iron can only form iron oxide in a weak reducing a...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 陈俊红封吉圣贾元平赵兵朱波孙加林李勇薛文东
Owner ZIBO CITY LUZHONG REFRACTORIES CO LTD
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