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A calcium titanate-aluminate-mullite composite refractory material and preparation method thereof

A calcium aluminate titanate and refractory material technology, which is applied in the field of blown desulfurization, can solve the problems of increased material cost, poor thermal shock resistance, and more mullite, so as to improve the flexural compressive strength and flexural compressive strength The effect of high strength and low thermal expansion coefficient

Active Publication Date: 2020-04-24
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such as "SiO 2 Micropowder and Al 2 o 3 The effect of micropowder addition on the properties of mullite-corundum castables” (Li Hongbo, Zhao Jizeng, Chen Qi. SiO 2 Micropowder and Al 2 o 3 The influence of the amount of fine powder added on the performance of mullite-corundum castable[J]. Refractories, 2007, 41(6): 435-438.) In the article, mullite M45, fused mullite, corundum powder, SiO 2 Micropowder and Al 2 o 3 Micro powder is used as raw material and pure calcium aluminate cement is used as binder to prepare mullite-corundum castable. Although the apparent porosity of the product is reduced and the bulk density and strength are improved, its thermal shock resistance is poor, and the introduction of mollite There are more stones, which increases the cost of materials; another example is "The influence of SiAlON on the performance of corundum-mullite desulfurization spray gun" (Jiang Shan, Zhang Dede et al. The influence of SiAlON on the performance of corundum-mullite desulfurization spray gun[J ].Refractories, 2006,40(3): 234-235.) In the article, only when the amount of SiAlON added is large, the product has better high temperature strength and slag resistance, so the cost of the material is very high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A calcium aluminate titanate-mullite composite refractory material and a preparation method thereof. The preparation method described in this embodiment is:

[0027] With 40~42wt% mullite particles, 10~14wt% mullite fine powder, 26~30wt% calcium aluminate titanate particles, 8~10wt% silicon carbide fine powder and 8~10wt% corundum fine powder powder as raw material, plus 3~4wt% pure calcium aluminate cement, 0.05~0.2wt% naphthalene-based water reducing agent and 4~4.7wt% water, stirred for 6~8min, vibrated and molded at room temperature Curing for 40~43h, drying at 90~115°C for 20~30h to prepare calcium aluminate titanate-mullite composite refractory material.

[0028] The calcium aluminate titanate-mullite composite refractory material prepared in this example is tested: the yield is 99.0~99.5%; the bulk density is 2.69~2.73g cm -3 ; Apparent porosity is 12.5~13.5%; Flexural strength is 16~17.5MPa; Compressive strength is 119~123MPa; Thermal conductivity is 1.6~1.64W...

Embodiment 2

[0030] A calcium aluminate titanate-mullite composite refractory material and a preparation method thereof. The preparation method described in this embodiment is:

[0031] With 41~43wt% mullite particles, 12~16wt% mullite fine powder, 24~28wt% calcium aluminate titanate particles, 7~9wt% silicon carbide fine powder and 6~8wt% corundum fine powder powder as raw material, add 3~4wt% pure calcium aluminate cement, 0.05~0.2wt% polycarboxylate water reducer and 4.4~5.1wt% water, stir for 6~8min, vibrate for molding, room temperature Curing under the same conditions for 42~44h, and drying at 90~115°C for 20~30h to prepare the calcium aluminate-mullite composite refractory material.

[0032] The calcium aluminate titanate-mullite composite refractory material prepared in this example is tested: the yield rate is 99.0~99.5%; the bulk density is 2.71~2.75g cm -3 ; Apparent porosity is 12~13%; Flexural strength is 17~18MPa; Compressive strength is 121~125MPa; Thermal conductivity is 1....

Embodiment 3

[0034] A calcium aluminate titanate-mullite composite refractory material and a preparation method thereof. The preparation method described in this embodiment is:

[0035] With 42~44wt% mullite particles, 14~18wt% mullite fine powder, 22~26wt% calcium aluminate titanate particles, 5~7wt% silicon carbide fine powder and 7~9wt% corundum fine powder powder as raw material, plus 3~4wt% pure calcium aluminate cement, 0.05~0.2wt% naphthalene-based water reducer and 4.8~5.5wt% water, stirred for 6~8min, vibrated for molding, at room temperature Curing for 43~46h, drying at 90~115°C for 20~30h to prepare calcium aluminate-mullite composite refractory material.

[0036] The calcium aluminate titanate-mullite composite refractory material prepared in this example is tested: the yield rate is 99.0~99.5%; the bulk density is 2.67~2.71g cm -3 ; The apparent porosity is 13~14%; the flexural strength is 15.5~16.5MPa; the compressive strength is 117~121MPa; the thermal conductivity is 1.64...

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Abstract

The invention relates to a calcium titanium aluminate-mullite composite refractory and a preparation method thereof. The technical scheme adopted by the invention is that the preparation method comprises the following steps: selecting 40 to 45 weight percent of mullite particles, 10 to 20 weight percent of fine mullite powder, 20 to 30 weight percent of calcium titanium aluminate particles, 5 to 10 weight percent of silicon carbide fine powder and 5 to 10 weight percent of corundum fine powder as raw materials, adding 3 to 4 weight percent of pure calcium aluminate cement, 0.05 to 0.2 weight percent of water reducing agent and 4 to 6 weight percent of water, stirring for 6 to 8 minutes and then vibrating and forming; maintaining for 40 to 48 hours under the condition of room temperature and then drying for 20 to 30 hours under the condition of 90 to 115 DEG C to obtain the calcium titanium aluminate-mullite composite refractory. The preparation method disclosed by the invention has the characteristics of low cost, simple technology and high rate of finished product. The prepared calcium titanium aluminate-mullite composite refractory prepared by the method has the characteristics of relatively-low apparent porosity, relatively-high flexural compressive strength, small heat conductivity coefficient and excellent thermal shock resistance stability.

Description

technical field [0001] The invention belongs to the technical field of jet desulfurization. Specifically relates to a calcium aluminate-mullite composite refractory material and a preparation method thereof. Background technique [0002] With the accumulation of a large amount of waste slag generated in the smelting industry, it not only takes up space but also affects the environment, so it is of great significance to utilize the waste. At present, in the desulfurization process of molten iron, the refractory materials for desulfurization guns are mainly corundum-mullite castables, burnt gemstone-mullite-corundum castables, and corundum castables. Such as "SiO 2 Micropowder and Al 2 o 3 The effect of micropowder addition on the properties of mullite-corundum castables” (Li Hongbo, Zhao Jizeng, Chen Qi. SiO 2 Micropowder and Al 2 o 3 The influence of the amount of fine powder added on the performance of mullite-corundum castable[J]. Refractories, 2007, 41(6): 435-438...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
CPCC04B35/66C04B2235/77C04B2235/96C04B2235/9607
Inventor 赵惠忠陈建威张寒余俊王相辉
Owner WUHAN UNIV OF SCI & TECH