阅读说明：本技术 球形氧化铝微粉在耐火浇注料中的应用 (Application of spherical alumina micropowder in refractory castable ) 是由 谭莹 刘卫东 朱树峰 高念 于 2019-11-01 设计创作，主要内容包括：本发明公开了球形氧化铝微粉在耐火浇注料中的应用,属于耐火浇注料技术领域,所述耐火浇注料包括如下成分及其重量份数：耐火骨料64～70份、胶结料18份、氧化铝微粉0～7份,球形氧化铝微粉0～7份,水泥6份、蓝晶石2份、柠檬酸0.03份、3p0.05份以及防爆纤维0.25份,所述球形氧化铝微粉含有氧化铝、二氧化硅、氧化铁和氧化钠为主要成分,其中氧化铝含量≥99.5％的高岭土生料,二氧化硅含量≤1200ppm,氧化铁含量≤800ppm,氧化钠含量≤3500ppm。本发明解决了现有的耐火浇注料高温使用性能差使用寿命短以及致密性不良且流动性不佳的问题。(The invention discloses an application of spherical alumina micropowder in a refractory castable, belonging to the technical field of refractory castable, wherein the refractory castable comprises the following components in parts by weight: 64-70 parts of refractory aggregate, 18 parts of cementing material, 0-7 parts of alumina micro powder, 0-7 parts of spherical alumina micro powder, 6 parts of cement, 2 parts of kyanite, 0.03 part of citric acid, 0.05 part of 3p and 0.25 part of explosion-proof fiber, wherein the spherical alumina micro powder contains alumina, silica, iron oxide and sodium oxide as main components, wherein the content of alumina is more than or equal to 99.5 percent of kaolin raw material, the content of silica is less than or equal to 1200ppm, the content of iron oxide is less than or equal to 800ppm, and the content of sodium oxide is less than or equal to 3500 ppm. The invention solves the problems of poor high-temperature service performance, short service life, poor compactness and poor fluidity of the existing refractory castable.)

1. The application of the spherical alumina micropowder in the refractory castable is characterized in that the refractory castable comprises the following components in parts by weight: 64-70 parts of refractory aggregate, 18 parts of cementing material, 0-7 parts of alumina micro powder, 0-7 parts of spherical alumina micro powder, 6 parts of cement, 2 parts of kyanite, 0.03 part of citric acid, 0.05 part of 3p and 0.25 part of explosion-proof fiber, wherein the spherical alumina micro powder contains alumina, silica, iron oxide and sodium oxide as main components, wherein the content of alumina is more than or equal to 99.5 percent of kaolin raw material, the content of silica is less than or equal to 1200ppm, the content of iron oxide is less than or equal to 800ppm, and the content of sodium oxide is less than or equal to 3500 ppm.

2. The refractory castable according to claim 1, wherein the particle size of the spherical alumina micro powder is 2-120 μm.

Technical Field

The invention relates to the technical field of alumina micro powder, in particular to application of spherical alumina micro powder in refractory castable.

Background

The use of the micro powder promotes the development of refractory materials, particularly the use of the aluminum oxide micro powder and the silicon dioxide micro powder in casting materials, so that the water content of a casting forming body is reduced, the compactness is improved, the particles of the silicon dioxide micro powder are spherical, the spherical particles have smaller specific surface area and larger stacking density, the isotropy of the spherical particles is good, the stress strain is uniform, the friction coefficient of the spherical particles is small, when the particles are added into a refractory material matrix, the fluidity and the filling property are good, and the moisture can be effectively released, however, the melting point of the silicon dioxide micro powder is low, impurities are easily introduced to react with other components in the matrix at high temperature to form a low-melting-point phase, the high-temperature service performance of the material is reduced, the service life is lower, the aluminum oxide micro powder has the characteristics of high melting point and good high-temperature stability, but the micro appearance, therefore, the problems of poor product compactness and poor fluidity exist, and the application of the spherical alumina micropowder in the refractory castable is urgently needed to be designed and applied to the refractory castable.

Disclosure of Invention

The invention aims to solve the defects in the prior art, such as: the existing refractory castable containing silica micropowder has poor high-temperature service performance, short service life, and poor compactness and flowability of the refractory castable containing alumina micropowder.

In order to achieve the purpose, the invention adopts the following technical scheme: the application of the spherical alumina micropowder in the refractory castable comprises the following components in parts by weight: 64-70 parts of refractory aggregate, 18 parts of cementing material, 0-7 parts of alumina micro powder, 0-7 parts of spherical alumina micro powder, 6 parts of cement, 2 parts of kyanite, 0.03 part of citric acid, 0.05 part of 3p and 0.25 part of explosion-proof fiber, wherein the spherical alumina micro powder contains alumina, silica, iron oxide and sodium oxide as main components, wherein the content of alumina is more than or equal to 99.5 percent of kaolin raw material, the content of silica is less than or equal to 1200ppm, the content of iron oxide is less than or equal to 800ppm, and the content of sodium oxide is less than or equal to 3500 ppm.

Preferably, the particle size of the spherical alumina micro powder is 2-120 microns.

Compared with the prior art, the invention has the beneficial effects that:

1. the spherical alumina micropowder improves the fluidity of the product, or reduces the water adding amount under the same flow value, so that the castable has great advantages in application;

2. the addition of the spherical alumina micropowder in the invention enables the product to be more compact, and the compactness is higher under the same formula, so that the castable has longer service life when being applied;

3. the spherical alumina micropowder in the invention contributes to the improvement of the strength at medium and high temperature, and the trend of linear change is also reduced. Under the use condition of high temperature, the service life of the product can be greatly prolonged;

4. the invention widens the application field of the spherical alumina, makes up for certain defects and shortcomings in the performance of the castable, and greatly improves the application performance of the castable product.

Drawings

FIG. 1 is a chart comparing data for examples 1-7 according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.