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Method for synthesizing ferrous aluminum spinel

A ferrous-aluminum spinel and compound technology, applied in the field of refractory materials, can solve the problems of affecting the high temperature performance of the material and the difficulty, and achieve the effects of stable product performance, easy implementation and high synthesis purity

Active Publication Date: 2010-09-08
SHANDONG SHENGCHUAN CERAMICS +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

[0016] Take industrial alumina powder and rolled steel powder with particle size less than 180 mesh, according to Al 3+ with Fe n+ The molar ratio of ions is 2: 1 for batching and co-grinding, then add the above-mentioned methyl cellulose binder of 4% of the total weight, then add water and knead, enter the high-temperature kiln to heat up after being pressed by a press and dried; After being kept in the kiln for 12 hours at 1400-1500°C under a nitrogen atmosphere, it is naturally cooled and taken out.

[0017] The ferrous aluminum spinel synthesized in this embodiment is detected by X-ray diffraction, and its phase is mainly FeAl 2 o 4 , accounting for more than 80wt% of the total material.

Embodiment 2

[0019] Take industrial alumina powder and iron oxide red fine powder with particle size less than 180 mesh, according to Al 3+ with Fe 3+ The molar ratio of the ions is 2:1 for batching and co-grinding, then adding the dextrin binder of the above-mentioned total weight of 5%, then adding water and kneading, after being formed by a press and dried, enter the high-temperature kiln to heat up; in the high-temperature kiln 1500-1600 ℃, under nitrogen atmosphere for 8 hours, then naturally cooled and taken out.

[0020] The ferrous aluminum spinel synthesized in this embodiment is detected by X-ray diffraction, and its phase is mainly FeAl 2 o 4 , accounting for more than 80wt% of the total material.

Embodiment 3

[0022] Take bauxite powder and rolled steel skin fine powder with particle size less than 180 mesh, according to Al 3+ with Fe n+ The molar ratio of the ions is 2:1 for batching and co-grinding, then adding the above-mentioned 5% polyvinyl alcohol binder by weight, then adding water and kneading, after being formed by a press and dried, enter the high-temperature kiln to heat up; in the high-temperature kiln After being kept at 1500-1600°C for 9 hours under a nitrogen atmosphere, it was naturally cooled and taken out.

[0023] The ferrous aluminum spinel synthesized in this embodiment is detected by X-ray diffraction, and its phase is mainly FeAl 2 o 4 , accounting for more than 80wt% of the total material.

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Abstract

The invention relates to a method for synthesizing ferrous aluminum spinel, belonging to the technical field of fireproofing materials. The method comprises the following steps of: mixing ferrous compound and aluminiferous compound according to the mol ratio of Fen<+> to Al<3+> of 1:2, additionally adding a binding agent accounting for 1-6 percent of the weight of the mixture, mixing, pressing, drying and sintering under the nitrogen atmosphere at the temperature of 1300-1700 DEG C, and keeping the temperature for 2-12 hours. The invention has the advantages of high synthetic purity, simple process and easy actualization.

Description

technical field [0001] The invention relates to a method for synthesizing ferrous aluminum spinel, belonging to the technical field of refractory 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 pinite is rarely found in nature and can only be synthesized artificially. Such as CN200710053793.3 "A method for synthesizing iron-aluminum spinel" patent application records the use of 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 The method of mixing iron-co...

Claims

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Application Information

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IPC IPC(8): C04B35/44C04B35/622
CPCC04B2235/656C04B2235/3272C04B2235/658C04B2235/6567C04B35/44
Inventor 陈俊红封吉圣郑本水石志民赵兵朱波孙加林李勇薛文东
Owner SHANDONG SHENGCHUAN CERAMICS
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