Lightweight anorthite microporous refractory aggregate and preparation method thereof

A technology of refractory aggregate and light calcium is applied in the field of lightweight microporous refractory aggregate, which can solve the problems of reducing the thermal insulation effect of refractory materials, increasing the thermal conductivity of refractory materials, and increasing damage of refractory materials, and achieving high strength , less impurities, less shrinkage and deformation

Inactive Publication Date: 2012-07-11
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The commonly used refractory castables are mainly Al 2 o 3 -SiO 2 However, when this type of refractory material is used in petrochemical and other industries, due to the influence of the reducing atmosphere environment, the damage of the refractory material will be aggravated, thereby reducing the service life of the material
In addition, due to the large size of pores in traditional refractory aggregates, the pore diameters are mos...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A lightweight anorthite microporous refractory aggregate, the preparation steps of which are as follows:

[0022] 1) Take kaolin, bauxite, silica powder, limestone and calcium hydroxide respectively, and grind them to a particle size of less than 0.074mm to obtain kaolin fine powder, bauxite fine powder, silica powder fine powder and limestone fine powder and calcium hydroxide fine powder, set aside;

[0023] 2) Weigh respectively 20kg of kaolin fine powder, 30kg of bauxite fine powder, 20kg of silica powder fine powder and 30kg of limestone fine powder prepared in step 1, put them into a ball mill with corundum balls after mixing, and grind to obtain Mixtures with a particle size of less than 20 μm are reserved for use;

[0024] 3) Add 3kg of dextrin to the co-milled mixture in step 2, and press it into a green body with a size of 230mm×114mm×65mm on a press with a pressure of 50~60MPa, and set it aside;

[0025] 4) Dry the green body in step 3 naturally for 24 hours...

Embodiment 2

[0028] A lightweight anorthite microporous refractory aggregate, the preparation steps of which are as follows:

[0029] 1) Take kaolin, bauxite, silica powder, limestone and calcium hydroxide respectively, and grind them to a particle size of less than 0.074mm to obtain kaolin fine powder, bauxite fine powder, silica powder fine powder and limestone fine powder and calcium hydroxide fine powder, set aside;

[0030] 2) Weigh 30kg of kaolin fine powder, 22kg of bauxite fine powder, 21kg of silica powder fine powder and 27kg of limestone fine powder prepared in step 1 respectively, mix them and put them into a ball mill with corundum balls for ball milling, and finally obtain the material The mixture with a particle size of less than 20 μm is reserved for use;

[0031] 3) Add 6kg of dextrin to the co-ground mixture in step 2, and press it into a green body with a size of 230mm×114mm×65mm on a press at a pressure of 50~60MPa, and set aside;

[0032] 4) Dry the green body in ste...

Embodiment 3

[0035] A lightweight anorthite microporous refractory aggregate, the preparation steps of which are as follows:

[0036] 1) Take kaolin, bauxite, silica powder, limestone and calcium hydroxide respectively, and grind them to a particle size of less than 0.074mm to obtain kaolin fine powder, bauxite fine powder, silica powder fine powder and limestone fine powder and calcium hydroxide fine powder, set aside;

[0037] 2) Weigh respectively 38kg of kaolin fine powder, 22kg of bauxite fine powder, 15kg of silica powder fine powder and 25kg of calcium hydroxide fine powder prepared in step 1, mix them and put them into a ball mill with corundum balls for ball milling, and finally get Mixtures with a particle size of less than 20 μm are reserved for use;

[0038] 3) Add 4kg of dextrin to the co-ground mixture in step 2, and press it into a green body with a size of 230mm×114mm×65mm on a press with a pressure of 50~60MPa, and set it aside;

[0039] 4) Dry the green body in step 3 n...

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Abstract

The invention relates to lightweight anorthite microporous refractory aggregate. The lightweight anorthite microporous refractory aggregate is prepared by the steps of mixing and ball-milling kaolin, bauxite, silica powder, limestone and calcium hydroxide, adding dextrin, sintering and crushing. In the prepared refractory aggregate, the main phase is anorthite; in the presence of the anorthite phase, the aggregate has the characteristic of high stability when being used in the reducing atmosphere environment; the starting material has high purity and the mixed impurity components are small, so that the anorthite phase content of the finally obtained product is high, and the product has small shrinkage deformation and high high-temperature volume stability and contributes to maintenance ofthe whole structure of industrial kiln furnace wall lining; materials are ground and prepared, so that the materials are dispersed uniformly and have small granularity; and the air holes in the aggregate have small aperture which is micro-scale and have closed spherical structures, so that microporous aggregate has low thermal conductivity coefficient and high strength.

Description

technical field [0001] The invention relates to a lightweight microporous refractory aggregate used in the field of refractory materials, in particular to a lightweight anorthite microporous refractory aggregate and a preparation method thereof. Background technique [0002] Refractory materials are widely used in metallurgy, petrochemical, glass and other high-temperature industries due to their good corrosion resistance to high-temperature media and their thermal insulation properties. As my country's emphasis on energy saving and consumption reduction continues to increase, more research and development has been done on lightweight refractory materials with good thermal insulation effects. Unshaped refractory materials have received special attention due to their advantages of convenient construction, low production cost, and good overall structure of the lining, among which refractory castables are the most widely used. [0003] The commonly used refractory castable...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 毕玉保周宁生王慧芳于仁红张希君李纯明
Owner HENAN UNIV OF SCI & TECH
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