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Ferrous aluminum and magnesium system refractory raw material and preparation method thereof

A technology of refractory raw materials, ferrous aluminum, applied in the field of refractory materials, can solve the problems of affecting the high temperature performance of materials, difficulty and so on

Active Publication Date: 2011-02-16
ZIBO CITY LUZHONG REFRACTORIES CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the buried carbon synthesis process, the iron oxides in the ingredients may be partially transformed into elemental iron. Therefore, the synthesis of single-phase FeO·Al 2 o 3 It is very difficult, and the existing elemental iron will be transformed into Fe during firing and use 2 o 3 , thereby affecting the high-temperature performance of the material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] According to the mass ratio of rolled steel skin fine powder and industrial alumina powder according to Fe 2 O 3 : Al 2 O 3 Compounding, co-milling at 15:85, and then adding 3% phenolic resin for 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 1400-1700 ° C under a nitrogen atmosphere for 2-8 hours, and then naturally cooled and taken out.

[0016] The refractory raw materials synthesized in this example are composed of Fe 2 O 3 14.9%, Al 2 O 3 84.6%; detected by X-ray diffraction, its phase is mainly FeAl 2 O 4 .

Embodiment 2

[0018] According to the iron oxide red fine powder and the aluminum hydroxide powder according to the mass ratio Fe 2 O 3 : Al 2 O 3 For 20:80 ingredients, then add Fe 2 O 3 +Al 2 O 3 Calculate the mass of 20% of light-burned magnesium powder, co-grind, and then add 5% of phenolic resin for 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 1400-1700 ° C under a nitrogen atmosphere for 2-8 hours, and then naturally cooled and taken out.

[0019] The refractory raw materials synthesized in this example are composed of Fe 2 O 3 16.2%, Al 2 O 3 66.3%, MgO 16.5%; by X-ray diffraction detection, its phase is mainly MgAl 2 O 4 and FeAl 2 O 4 Wait.

Embodiment 3

[0021] According to the mixture of iron oxide red fine powder and elemental iron and corundum aluminum powder according to the mass ratio Fe 2 O 3 : Al 2 O 3 For 20:80 ingredients, then add Fe 2 O 3 +Al 2 O 3 Calculate the mass of 20% fused magnesia powder, co-grind, and then add 2% dextrin for 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 1400-1700 ° C under a nitrogen atmosphere for 2-8 hours, and then naturally cooled and taken out.

[0022] The refractory raw materials synthesized in this example are composed of Fe 2 O 3 16.3%, Al 2 O 3 66.1%, MgO 16.4%; by X-ray diffraction detection, its phase is mainly MgAl 2 O 4 and FeAl 2 O 4 Wait.

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Abstract

The invention provides a ferrous aluminum and magnesium system refractory raw material which is a multiple solid solution or composite of ferrous aluminate spinel and / or alumina spinel and / or ferromagnesium solid solution and / or pleonaste. The refractory raw material is prepared by the following steps of: mixing a ferrous compound, an aluminum-containing compound and a magnesium oxide-containing compound according to the ratio; additionally adding 1-6 percent bonding agent; mixing, forming and drying a blank; maintaining the mixture in a high-temperature kiln in the nitrogen atmosphere at the temperature of 1,400-1,700DEG C for 2-8 hours; and naturally cooling and taking out the product. In the scheme, the granularities of the alumina-containing raw material and the ferrous raw material are less than 180 meshes. The invention aims at synthesizing the ferrous aluminum and magnesium system refractory raw material with stable performance and avoids the volume effect due to the change of ferrum among different valence states. The method has simple synthesis process and is easy to implement.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and relates to a method for synthesizing ferrous-aluminum-magnesium series refractory raw materials. Background technique [0002] Researchers from Austrian Magnesium Corporation (RHI) found that the introduction of ferrous aluminum spinel into magnesia materials not only cannot greatly reduce the high temperature performance of the material, but also can significantly improve the hanging of magnesia materials in cement rotary kilns. Therefore, magnesia bricks added with ferrous spinel have become the most promising chrome-free materials to completely replace magnesia-chrome bricks. [0003] Ferrous aluminum spinel is very rare in nature and can only be synthesized artificially. For example, "a method of synthesizing iron-aluminum spinel" (CN200710053793.3) adopts Al 2 O 3 , Al(OH) 3 , Al 2 O 3 ·H 2 O and bauxite, etc. and Fe 2 O 3 , FeO and Fe 3 O 4 and other iron-contain...

Claims

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Application Information

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IPC IPC(8): C04B35/66
CPCC04B2235/3206C04B35/117C04B2235/3272C04B2235/3217
Inventor 陈俊红封吉圣郑本水孙加林李勇薛文东石志民赵兵朱波
Owner ZIBO CITY LUZHONG REFRACTORIES CO LTD
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