Light-weight micro-closed-pore alumina refractory aggregate and preparation method thereof

A refractory aggregate and micro-closed cell technology, applied in the field of refractory materials, can solve the problems of inability to resist erosion and penetration of slag and high-temperature medium, complex wet preparation process, low apparent porosity and pore size, and achieve the promotion of grain boundary Effects of moving speed, high closed porosity, and small average pore diameter

Active Publication Date: 2017-02-22
山西明景耐火材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the above preparation methods, the raw materials are ground and reshaped. On the one hand, the process is more complicated. More importantly, the prepared refractory aggregate usually has a high apparent porosity and a large pore size, and cannot resist slag during use. And the erosion and penetration of high temperature medium
[0005] "A microporous lightweight bauxite refractory aggregate and its preparation method" (ZL 201410447797.X) patent technology, a microporous lightweight bauxite refractory aggregate is prepared by a wet method, and the prepared product has a low The apparent porosity and pore size, however, the wet preparation process adopted is relatively complicated, and it is difficult to realize industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A light-weight micro-closed bauxite refractory aggregate and a preparation method thereof. The preparation method described in this example is as follows: at a heating rate of 3-7°C / min, the bulk alumina raw meal is heated up to the final temperature in stages to obtain a lightweight micro-closed-cell alumina refractory aggregate.

[0020] The stepwise heating up to the final temperature described in this embodiment is: when the temperature rises to 300°C, 400°C, 500°C, 600°C, 900°C, 1100°C, 1200°C and the final temperature respectively, keep warm for 1-3 hours.

[0021] The final temperature is 1550~1650°C.

[0022] The lightweight micro-closed bauxite refractory aggregate prepared in this example is tested: the bulk density is 2.6~2.7g / cm 3 ; The apparent porosity is 6~10%; the average pore size is 1~2μm.

Embodiment 2

[0024] A light-weight micro-closed bauxite refractory aggregate and a preparation method thereof. The preparation method described in this example is as follows: at a heating rate of 3-7°C / min, the bulk alumina raw meal is heated up to the final temperature in stages to obtain a lightweight micro-closed-cell alumina refractory aggregate.

[0025] The staged heating up to the final temperature described in this embodiment is: when the temperature rises to 300°C, 400°C, 500°C, 600°C and 900°C respectively, keep warm for 1 to 3 hours; ℃, keep warm for 2~4 hours; when the temperature rises to the final temperature, keep warm for 1~3 hours.

[0026] The final temperature is 1550~1650°C.

[0027] The lightweight micro-closed bauxite refractory aggregate prepared in this example is tested: the bulk density is 2.6~2.75g / cm 3 ; The apparent porosity is 5~10%; the average pore diameter is 0.9~2μm.

Embodiment 3

[0029] A light-weight micro-closed bauxite refractory aggregate and a preparation method thereof. The preparation method described in this example is as follows: at a heating rate of 3-7°C / min, the bulk alumina raw meal is heated up to the final temperature in stages to obtain a lightweight micro-closed-cell alumina refractory aggregate.

[0030] The step-by-step heating up to the final temperature is: when the temperature rises to 300°C, 400°C, 500°C, 600°C and 900°C respectively, keep warm for 2 to 4 hours, when the temperature rises to 1100°C, 1200°C and finally When the temperature is high, keep warm for 1 to 3 hours.

[0031] The final temperature is 1550~1650°C.

[0032] The lightweight micro-closed bauxite refractory aggregate prepared in this example is tested: the bulk density is 2.7~2.85g / cm 3 ; The apparent porosity is 5~8%; the average pore diameter is 0.8~1.6μm.

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Abstract

The invention relates to light-weight micro-closed-pore alumina refractory aggregate and a preparation method thereof. According to the technical scheme, the light-weight micro-closed-pore alumina refractory aggregate is obtained through the step that the temperature of blocky alumina raw materials is increased to the final temperature through a temperature-gradient method, wherein the step of increasing the temperature of the blocky alumina raw materials to the final temperature through the temperature-gradient method comprises the step that heat preservation is conducted for 1 hours to 4 hours when the temperature is increased to 300 DEG C, 400 DEG C, 500 DEG C, 600 DEG C, 900 DEG C, 1,100 DEG C, 1,200 DEG C and the final temperature separately, the final temperature ranges from 1,500 DEG C to 1,650 DEG C, and the Al2O3 content of the blocky alumina raw materials is higher than or equal to 45%. The preparation method is simple in process and low in cost, and the light-weight micro-closed-pore alumina refractory aggregate prepared through the method has the advantages of being low in apparent porosity, high in closed porosity and strength and small in average pore size.

Description

technical field [0001] The invention belongs to the technical field of refractory materials. In particular, it relates to a light-weight micro-closed bauxite refractory aggregate and a preparation method thereof. Background technique [0002] With the rapid development of my country's economy, industries with high energy consumption, such as steel, cement, and electric power industries, have an increasing demand for energy, and the contradiction between energy shortage and rapid increase in demand has become increasingly prominent. The modern high-temperature industry not only requires the refractories used to have excellent mechanical strength, good thermal spalling resistance, and excellent erosion and erosion resistance, but also requires low energy consumption and high thermal efficiency. Therefore, the development of high-quality refractory materials that satisfy the above-mentioned multiple functions has become the research focus of the refractory industry. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B38/00C04B35/185
CPCC04B35/185C04B35/66C04B38/0054C04B2235/3218C04B2235/349C04B2235/77C04B38/0067C04B38/0074
Inventor 顾华志罗志安付绿平黄奥张美杰
Owner 山西明景耐火材料有限公司
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