Method for synthesizing ferrum-aluminium spinelle

A ferroaluminum spinel and compound technology, which is applied in the field of refractory materials, can solve the problems of large environmental pollution, easy occurrence of thermite reaction, and high synthesis temperature, and achieve the effects of no environmental pollution, low raw material prices, and low reaction temperature

Inactive Publication Date: 2008-05-21
WUHAN UNIV OF SCI & TECH
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Iron-aluminum spinel (FeO.Al 2 o 3 ) exists very rarely in nature, and the iron-aluminum spinel is generally synthesized by electrofusion, such as Al 2 o 3 and Fe as raw materials (Journal of Magnetism and Magnetic Materials, 2003, 264: 264-274), but the reaction process is difficult to control, and the reaction is not sufficient
The method of mechanochemical synthesis of iron-aluminum spinel is to use planetary mill to combine Al and Fe 3 o 4 Grinding for a certain period of time, and then reacting and synthesizing in an argon atmosphere at 1200°C (Materials Chemistry and Physics, 2002, 76: 104-109), which adopts a two-step treatment method, the process is complicated, and the thermite reaction is eas...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] A method for synthesizing iron-aluminum spinel: 396 grams of Al(OH) with particle size less than 180 mesh 3 and Al 2 o 3 ·H 2 Aluminum-containing mixtures of O, 232 grams of Fe less than 180 mesh 2 o 3 The iron-containing mixture of FeO and FeO is mixed according to the molar ratio of Al ions and Mn ions as 2:1, plus 2-4 wt% of the above-mentioned total mixture of methyl cellulose and 50 grams of TiO with a particle size of less than 180 mesh 2 powder. where Al(OH) 3 The content in the aluminum-containing mixture is 35-45wt%, Fe 2 o 3 The content in iron-containing mixture is 65-75wt%.

[0010] The process conditions of this embodiment 1 are: mix the above-mentioned mixture for 5-180 minutes, press it into shape under a pressure of 40-200Mpa, dry it in an oven at 110°C for 24 hours, and then dry it at 1-10°C / min under a nitrogen atmosphere. The heating rate is to heat up to 1200-1500°C, keep it warm for 30-240 minutes, and take it out after natural cooling.

...

Embodiment 2

[0013] A method for synthesizing iron-aluminum spinel: 378 grams of particle size is 325 mesh corundum fine powder, Al(OH) 3 and Al 2 o 3 ·H 2 Aluminum-containing mixture of O, 232 grams of Fe with particle size less than 180 mesh 2 o 3 The iron-containing mixture of FeO and FeO is mixed according to the molar ratio of Al ions and Mn ions as 2:1, plus 3-5 wt% of glycerin and 80 grams of TiO with a particle size of less than 180 meshes from the above-mentioned total mixture. 2 powder. Among them, the content of corundum fine powder in the aluminum-containing mixture is 37-45wt%, Al(OH) 3 In the aluminum-containing mixture, the content is 25-30wt%, Al 2 o 3 ·H 2 The content of O in the aluminum-containing mixture is 26-35wt%, Fe 2 o 3 The content in iron-containing mixture is 65-75wt%.

[0014] The process conditions of Example 2 are: mix the above mixture for 30-120 minutes, press isostatically under a pressure of 200-400Mpa, dry in an oven at 110°C for 24 hours, and...

Embodiment 3

[0017] A method for synthesizing iron-aluminum spinel: 855 grams of fine corundum powder with a particle size of less than 180 meshes, Al(OH) 3 、Al 2 o 3 ·H 2 Aluminum-containing mixture of O and special grade alumina with an alumina content of 80 wt%, 464 grams of 325 mesh Fe 2 o 3 , FeO and Fe 3 o 4 The iron-containing mixture is mixed according to the molar ratio of Al ions and Mn ions as 2:1, plus the aluminum sol of the above-mentioned total mixture of 3-5wt% and 120 grams of TiO with a particle size less than 180 mesh 2 powder. Among them, the content of corundum fine powder in the aluminum-containing mixture is 22-26wt%, Al(OH) 3 In the aluminum-containing mixture, the content is 15-20wt%, Al 2 o 3 ·H 2 The content of O in the aluminum-containing mixture is 25-30wt%, the content of special-grade alumina in the aluminum-containing mixture is 25-35wt%, Fe 2 o 3 The content in the iron-containing mixture is 45-55wt%, Fe 3 o 4 The content in the iron-containin...

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Abstract

The invention relates to a synthesis method of hercynite and has the technical proposal that aluminium compound and iron compound are mixed according to the mol ratio of Al ion to Fe ion of two to one, added with TiO2 fine powder of 1-20wt percent of the mixture obtained from the mixing of the aluminium compound and the iron compound and 1-6wt percent of binding agent to be mixed for 5 to 180 minutes for formation and then dried for 20 to 30 hours under the temperature of 90 to 120 DEG C and warmed up to 1100 to 1700DEG C with a temperature rising speed of 0.5 to 10 DEG C/min in the atmosphere of nitrogen to be kept warm for 5 to 600 minutes and next naturally cooled so as to obtain the hercynite. The invention is characterized by simple technology, low reaction temperature, low cost of raw materials and no environmental pollution; due to the low oxygen content in the atmosphere of the nitrogen, Fe elements exist in the form of Fe<2+> and all aluminium and iron are transformed to FeAl2O4 under the firing temperature; in addition, as the TiO2 is introduced, Ti<4+> can easily enter into crystal lattice of the FeAl2O4 to produce oxygen-iron vacancy concentration and ferric-ion vacancy concentration so as to promote the sintering with apparent porosity less than or equal to 2 percent after sintering.

Description

technical field [0001] The invention belongs to the technical field of refractory materials. In particular, it relates to a method for synthesizing iron-aluminum spinel. Background technique [0002] The traditional alkaline material magnesia-chromium bricks used in the firing zone of cement kiln has excellent high temperature resistance and corrosion resistance. It is very large, which limits the application of magnesia-chrome bricks. With the enhancement of people's awareness of environmental protection, it is imperative to develop low-chromium or chromium-free basic bricks for cement kilns. For chromium-free basic bricks, if a stable kiln skin can be formed on the hot surface of the furnace lining, the life of the furnace lining can be significantly improved. The French Refa Group (RHI or Refratechnik) found that the introduction of iron-aluminum spinel into chromium-free basic bricks can significantly improve the adhesion of the kiln skin. The product has high refracto...

Claims

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Application Information

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IPC IPC(8): C01F7/02C04B35/66C04B35/44
Inventor 李亚伟金胜利向涛李远兵赵雷李淑静
Owner WUHAN UNIV OF SCI & TECH
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