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Method for preparing homogeneous mullite material from kyanite

A technology of mullite homogeneous material and kyanite, which is applied in the field of preparation of natural kyanite ore to synthesize mullite homogeneous material, can solve problems such as unretrieved kyanite ore, and achieve suitable large-scale industrialization The production and firing temperature are low, and the effect of improving the utilization rate

Inactive Publication Date: 2012-02-15
ZHENGZHOU UNIV +1
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  • Summary
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  • Application Information

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Problems solved by technology

[0004] At present, no documents and invention patents have been retrieved on the preparation of mullite by using kyanite ore (especially low- and medium-grade kyanite ore) as raw material and adding the sintering aid used in the present invention.

Method used

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preparation example Construction

[0018] The preparation method of preparing mullite homogeneous material with kyanite of the present invention comprises the following steps:

[0019] a, by weight percentage: Al 2 o 3 Kyanite 60~90% with content ≥0%, Al 2 o 3 High alumina bauxite with content ≥85% 0~40%, Al 2 o 3 0-40% of industrial alumina with content ≥ 98%, and 0-1.5% of rare earth oxide used as sintering agent in the sum of the weight percentages of the above raw materials, and 0-1.5% of MgO with purity ≥ 98.5%; the rare earth oxide for CeO 2 , La 2 o 3 or Y 2 o 3 any of the

[0020] b. Use wet or dry co-grinding and mixing, the particle size is <0.074mm, use semi-dry machine pressing or wet extrusion to form a block body, and dry until the moisture content is <1.0%;

[0021] c. The dried green body is roasted at a temperature of 1460-1600°C, kept for 8-16 hours, and then cooled to room temperature to obtain Al 2 o 3 Content 45~70%, bulk density 2.3~2.8g / cm 3 product of.

[0022] Mullite hom...

Embodiment 1

[0024] Take by weight percentage: Al 2 o 3 Kyanite 100% with a content of 46% and a particle size of <0.074mm, mixed uniformly in a wet ball mill, dehydrated by pressure filtration, and vacuum squeezed to obtain a mud billet, dried and put into a kiln, kept at 1470°C for 8 hours, cooled The product was obtained at room temperature.

Embodiment 2

[0026] Take by weight percentage: Al 2 o 3 Kyanite 100% with a content of 53% and a particle size of <0.074mm, dry mixed evenly, add 6% water (or 8% pulp waste liquid), press into a billet, dry it and put it into a kiln, keep it at 1500°C for 10 hours, and cool it The product was obtained at room temperature.

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Abstract

The invention relates to a method for preparing a homogeneous mullite material from kyanite. The method is characterized in that the method comprises the following steps: 1, weighing 60-100 wt% of kyanite containing equal to or greater than 40% of Al2O3, 0-40 wt% of high bauxitic clay containing equal to or greater than 85% of Al2O3, 0-40% of industrial alumina containing equal to or greater than 98% of Al2O3, a sintering agent rare earth oxide which accounts for 0-1.5% of the sum of weight percentages of above raw materials, and 0-1.5% of MgO with the purity of equal to or greater than 98.5%, wherein the rare earth oxide is anyone of CeO2, La2O3 or Y2O3; 2, cogrinding mixing through a wet process or a dry process until the granularity is less than 0.074mm, extruding into a blocky blank through semi-dry extrusion or wet extrusion, and drying to the water content of less than 1.0%; and 3, calcining the dried blank under conditions of a temperature of 1460-1600DEG C, insulating for 8-16h, and cooling to room temperature to prepare products with the Al2O3 content of 45-70% and the volume density of 2.3-2.8g / cm<3>.

Description

technical field [0001] The invention belongs to the technical field of inorganic non-metallic materials, and in particular relates to a method for preparing mullite homogeneous material by synthesizing natural kyanite ore. Background technique [0002] Kyanite (Kyanite) is an aluminum-silicon mineral, and its chemical formula is: Al 2 o 3 —SiO 2 , which has irreversible transformation to mullite and SiO at high temperature 2 , and accompanied by a larger volume expansion characteristics. The application of kyanite is mainly to add a small amount of kyanite (<10%) as an expansion agent in the matrix of aluminum-silicon series (including clay, high alumina, mullite and corundum) refractory materials to improve refractory materials performance; add a small amount of kyanite (≤12%) to lightweight refractory materials to increase the content of mullite phase in products. After kyanite is added to the refractory material, because of its mullite reaction at high temperatur...

Claims

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Application Information

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IPC IPC(8): C04B35/185C04B35/622
Inventor 叶方保孙高扬杨敬梅杨文伟牛庆林钟香崇雷霞
Owner ZHENGZHOU UNIV
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