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

A refractory raw material, ferrous aluminum technology, applied in the field of refractory materials, can solve the problems that affect the high temperature performance of materials and are difficult

Active Publication Date: 2013-06-05
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 Fe rolled steel fine powder and industrial alumina powder 2 o 3 : Al 2 o 3 The ratio is 15:85 for batching, co-grinding, and then adding 3% phenolic resin 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 1400-1700 ° C under a nitrogen atmosphere for 2-8 hours, and then it is naturally cooled and taken out.

[0016] The synthetic refractory raw material of present embodiment, its composition is 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 aluminum hydroxide powder according to the mass ratio of Fe 2 o 3 : Al 2 o 3 For 20:80 batching, then add Fe 2 o 3 +Al 2 o 3 Calculating 20% ​​of the mass of light-burned magnesium powder, co-grinding, and then adding 5% of phenolic resin 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 1400-1700 ° C under a nitrogen atmosphere for 2-8 hours, and then it is naturally cooled and taken out.

[0019] The synthetic refractory raw material of present embodiment, its composition is Fe 2 o 3 16.2%, Al 2 o 3 66.3%, MgO 16.5%; detected by X-ray diffraction, 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 of Fe 2 o 3 : Al 2 o 3 For 20:80 batching, then add Fe 2 o 3 +Al 2 o 3 Calculate 20% of the mass of fused magnesia powder, co-grind, and then add 2% 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 1400-1700 ° C under a nitrogen atmosphere for 2-8 hours, and then it is naturally cooled and taken out.

[0022] The synthetic refractory raw material of present embodiment, its composition is Fe 2 o 3 16.3%, Al 2 o 3 66.1%, MgO 16.4%; detected by X-ray diffraction, its phase is mainly MgAl 2 o 4 and FeAl 2 o 4 Wait.

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Abstract

A hercynite-magnesia series refractory raw material and the production method thereof are provided. The refractory raw material is the multiphase solid solution or composite of hercynite and / or magnesia alumina spinel and / or solid solution of ferrous oxide and magnesia and / or magneferrite. The method comprises proportioning iron-contained compound, aluminium-contained compound and magnesia-contained material, adding 1-6% of binder, mixing, molding, drying the green body, sintering under nitrogen atmosphere at 1400-1700? in the high temperature kiln with the holding time of 2-8 hours, and taking out after natural cooling. The particle size of iron-contained compound and aluminium-contained compound is not more than 180 mesh. The hercynite-magnesia series refractory raw material has reliable properties, and the volume effect caused by the conversion of iron between different valence states is avoided. The method is simple and 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 refractory raw materials. Background technique [0002] Researchers from RHI 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 materials, but also can significantly improve the suspension of magnesia materials in cement rotary kilns. Therefore, magnesia bricks added with ferrous aluminum spinel have become the most promising chromium-free materials to fully replace magnesia-chrome bricks. [0003] Ferrous aluminum spinel exists very little in nature and can only be synthesized artificially. For example, "a method for synthesizing iron-aluminum spinel" (CN200710053793.3) uses 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-contai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
CPCC04B2235/3206C04B2235/3272C04B35/117C04B2235/3217
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