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Micro-porous mullite-silicon carbide multiphase fire resistant material and preparation method thereof

A refractory material and mullite technology, applied in the field of refractory materials, can solve the problems of poor corrosion performance of sulfur compounds, poor corrosion performance, poor corrosion resistance of gaseous alkali, chlorine and sulfur compounds, etc., and achieve excellent corrosion performance and thermal insulation performance. Good results

Inactive Publication Date: 2012-05-02
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] "Simo red bricks for large cement kilns and its manufacturing method" (ZL 200610097276.1) patented technology, using super-grade bauxite aggregate, silicon carbide, fused white corundum powder and andalusite powder as main raw materials to make silico red bricks, Although the heat insulation effect is good, its firing temperature is high, and its resistance to gaseous alkali, chlorine, and sulfur compounds is still poor
"High-strength and dense silica molybdenum brick and its production method" (CN200910095683.2) patented technology and "special silica molybdenum brick" (CN201010288841.9) patented technology, the prepared silica molybdenum brick has high compressive strength and thermal shock stability Good, but its corrosion resistance to alkali, chlorine and sulfur compounds is also poor
"A Silica Brick" (CN201010143497.4) patent technology, although the prepared silica brick has high strength and good heat preservation effect, it also does not solve the problem of poor corrosion resistance of gaseous alkali, chlorine and sulfur compounds
The patented technology of "Simo Wear-resistant Composite Brick" (ZL 200610128393.X) and the patented technology of "A Simo Structure and Heat Insulation Integrated Composite Brick and Its Preparation Method" (CN201010192172.5) mainly solve the problem of reducing the heat dissipation of the cement rotary kiln. problem, but it also does not solve the problem of poor corrosion resistance of gaseous alkali, chlorine and sulfur compounds

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A microporous mullite-silicon carbide composite refractory material and a preparation method thereof, the raw materials of the refractory material and their mass percentages are as follows (wherein, d represents the particle size, the same below):

[0035] 3mm>d≥1mm special-grade alumina particles 25-27%;

[0036] 1mm>d≥0.1mm super-bauxite particles 26-27%;

[0037] SiC particles with 1mm>d≥0.1mm 10~12%;

[0038] d≤0.074mm special grade bauxite fine powder 10~12%;

[0039] Andalusite fine powder with d≤0.088mm 8~10%;

[0040] Pyrophyllite fine powder with d≤0.088mm 3-5%;

[0041] α-Al 2 o 3 Micropowder 3~4%;

[0042] SiO 2 Micropowder 4~5%;

[0043] Guangxi white clay 5-6%;

[0044] Elemental Si powder 1-2%;

[0045] Al powder 1-1.5%.

[0046] The following additives are the percentages of the total mass of the above-mentioned raw materials:

[0047] Dextrin 1~2%;

[0048] Calcium lignosulfonate 0.4~0.6%;

[0049] Water 2-4%.

[0050] According to the respe...

Embodiment 2

[0058] A microporous mullite-silicon carbide composite refractory material and a preparation method thereof. The raw materials and mass percentages of the refractory material are as follows:

[0059] 3mm>d≥1mm special-grade alumina particles 28-30%;

[0060] 1mm>d≥0.1mm special grade alumina particles 24~25%;

[0061] 13-15% of SiC particles with 1mm>d≥0.1mm;

[0062] d≤0.074mm special grade bauxite fine powder 10~12%;

[0063] Andalusite fine powder with d≤0.088mm 6-8%;

[0064] Pyrophyllite fine powder with d≤0.088mm 2~4%;

[0065] α-Al 2 o 3 Micropowder 4~5%;

[0066] SiO 2 Micropowder 3~4%;

[0067] Guangxi white clay 4-5%;

[0068] Elemental Si powder 1-2%;

[0069] Al powder 1.5-2%.

[0070] Admixture in the present embodiment is identical with embodiment 1.

[0071] In the preparation steps of this embodiment, except for firing at 1250-1350° C. in step (5), the others are the same as in Embodiment 1.

[0072] The bulk density of the microporous mullite-sili...

Embodiment 3

[0074] A microporous mullite-silicon carbide composite refractory material and a preparation method thereof. The raw materials and mass percentages of the refractory material are as follows:

[0075] 3mm>d≥1mm special-grade alumina particles 26-28%;

[0076] 1mm>d≥0.1mm super-bauxite particles 25-26%;

[0077] SiC particles with 1mm>d≥0.1mm 11~13%;

[0078] d≤0.074mm special grade bauxite fine powder 13~15%;

[0079] Andalusite fine powder with d≤0.088mm 5~7%;

[0080] Pyrophyllite fine powder with d≤0.088mm 2~4%;

[0081] α-Al 2 o 3 Micropowder 3~4%;

[0082] SiO 2 Micropowder 3~4%;

[0083] Guangxi white clay 5-6%;

[0084] Elemental Si powder 2-3%;

[0085] Al powder 1-1.5%.

[0086] Admixture in the present embodiment is identical with embodiment 1.

[0087] In the preparation steps of this embodiment, except for firing at 1300-1400° C. in step (5), the others are the same as in Embodiment 1.

[0088] The bulk density of the microporous mullite-silicon carbide...

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Abstract

The invention relates to a micro-porous mullite-silicon carbide multiphase fire resistant material and a preparation method thereof. The micro-porous mullite-silicon carbide multiphase fire resistant material comprises the following ingredients: 25-30 wt% of super-grade bauxite particles having a particle size of no less than 1 mm and less than 3 mm, 24-27 wt% of super-grade bauxite particles having a particle size of no less than 0.1 mm and less than 1 mm, 10-15 wt% of SiC particles having a particle size of no less than 0.1 mm and less than1 mm, 10-15 wt% of super-grade bauxite fine powder having a particle size of less than 0.074 mm, 5-10 wt% of andalusite fine powder having a particle size of less than 0.088 mm, 2-5 wt% of pyrophyllite fine powder having a particle size of less than 0.088 mm, 3-5 wt% of active alpha-Al2O3 micro powder, 3-5 wt% of SiO2 micro powder, 4-6 wt% of Guangxi white clay, 1-3 wt% of elemental Si powder, and 1-2 wt% of Al powder, 1-2 wt% of dextrin, 0.4-0.6 wt% of calcium lignosulphonate, and 2-4 wt% of water. The micro-porous mullite-silicon carbide multiphase fire resistant material is prepared by mixing the ingredients, aging the mixture, moulding, drying and sintering. The prepared material has a uniform structure, has the average aperture less than 5 mum, has the characteristics of high strength, wear resistance, good thermal insulation performance, and excellent anti-alkali, chlorine, and sulfur compound erosion performance, and can meet the requirement of novel dry method cement production.

Description

technical field [0001] The invention belongs to the field of refractory materials, and in particular relates to a microporous mullite-silicon carbide composite refractory material and a preparation method thereof. Background technique [0002] Mullite-silicon carbide composite refractories are widely used in the upper and lower transition zones and secondary firing zones of new dry-process cement rotary kilns. The new dry process cement production technology has greatly improved the thermal efficiency and output of the cement production system, and promoted the development of cement production in the direction of high quality, high efficiency, large-scale and automation, representing the trend of cement production in the world today. However, in the new dry process cement production technology, not only the rotary kiln diameter is large, the kiln speed is fast and the kiln temperature is high, the thermal stress and mechanical stress of the material are very large; Alternat...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/622
Inventor 桑绍柏李亚伟李远兵赵雷金胜利李淑静
Owner WUHAN UNIV OF SCI & TECH
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