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A kind of lightweight micro-closed-cell clay 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 complex preparation process and difficult industrialized production, and achieve the effects of low apparent porosity, low cost and simple production process

Active Publication Date: 2019-06-25
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] "A microporous lightweight bauxite refractory aggregate and its preparation method" (ZL 201410447797.X) patent technology and "A micro-closed cell lightweight corundum refractory aggregate and its preparation method" (ZL 201410405108.9) patent technology, A lightweight bauxite refractory aggregate and a lightweight corundum refractory aggregate containing a large number of micro-closed pores were prepared respectively by a wet method. However, the wet preparation process used is relatively complicated and it is difficult to achieve industrial production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A lightweight micro-closed-cell clay 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 clay raw meal is heated up to the final temperature in stages to obtain a lightweight micro-closed-cell clay refractory aggregate.

[0020] The stepwise heating up to the final temperature is: when the temperature rises to 300°C, 400°C, 500°C, 600°C, 800°C, 900°C, 1100°C and the final temperature respectively, keep warm for 1-3 hours.

[0021] The final temperature is 1350~1500°C.

[0022] The lightweight micro-closed-cell clay refractory aggregate prepared in this example is tested: the bulk density is 1.4~1.6g / cm 3 ; The apparent porosity is 6~10%; the average pore diameter is 0.6~1μm.

Embodiment 2

[0024] A lightweight micro-closed-cell clay 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 clay raw meal is heated up to the final temperature in stages to obtain a lightweight micro-closed-cell clay refractory aggregate.

[0025] The step-by-step heating up to the final temperature is: when the temperature rises to 300°C, 400°C, 500°C, 600°C, 800°C and 900°C respectively, keep warm for 1-3 hours; when the temperature rises to 1100°C, keep warm 2~4 hours; when the temperature rises to the final temperature, keep warm for 1~3 hours.

[0026] The final temperature is 1350~1500°C.

[0027] The lightweight micro-closed-cell clay refractory aggregate prepared in this example is tested: the bulk density is 1.5~1.75g / cm 3 ; The apparent porosity is 5~10%; the average pore diameter is 0.5~1μm.

Embodiment 3

[0029] A lightweight micro-closed-cell clay 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 clay raw meal is heated up to the final temperature in stages to obtain a lightweight micro-closed-cell clay 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, 800°C and 900°C respectively, keep warm for 1 to 3 hours; when the temperature rises to 1100°C and At the final temperature, keep warm for 2 to 4 hours each.

[0031] The final temperature is 1350~1500°C.

[0032] The lightweight micro-closed-cell clay refractory aggregate prepared in this example is tested: the bulk density is 1.6~1.8g / cm 3 ; The apparent porosity is 4~8%; the average pore diameter is 0.4~0.8μm.

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PUM

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Abstract

The invention relates to a lightweight micro-closed-pore clay refractory aggregate and a preparation method thereof. The technical solution is: heating the bulk clay raw meal to the final temperature in stages at a heating rate of 3-10°C / min to obtain a lightweight micro-closed-cell clay refractory aggregate. The stepwise heating up to the final temperature is: when the temperature rises to 300°C, 400°C, 500°C, 600°C, 800°C, 900°C, 1100°C and the final temperature respectively, keep warm for 1-4 hours. The final temperature is 1200-1500°C. Al of the block clay raw meal 2 o 3 The content is 30~50wt%. The invention has simple process and low cost; the prepared lightweight micro-closed-cell clay refractory aggregate has the characteristics of low apparent porosity, high closed porosity, high strength, small average pore diameter and good erosion resistance to high-temperature medium erosion.

Description

technical field [0001] The invention belongs to the technical field of refractory materials. In particular, it relates to a lightweight micro-closed-cell clay refractory aggregate and a preparation method thereof. Background technique [0002] In recent years, energy saving and consumption reduction has become one of the important research directions of high-temperature industry. Thermal insulation materials have been developed rapidly. Lightweight high-temperature industrial furnace linings have also attracted more and more attention. Lightweight working lining refractory materials are currently the most important trend in the refractory industry. an important direction of development. First of all, the closer the heat-insulating refractory material is to the working surface, the better the heat-insulating and energy-saving effect. The lightweight working lining refractory material can effectively reduce heat loss, reduce production costs, and achieve the effect of energy ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B33/04
CPCC04B33/04C04B35/66C04B2235/6562C04B2235/6567C04B2235/661C04B2235/77
Inventor 顾华志罗志安付绿平黄奥张美杰
Owner WUHAN UNIV OF SCI & TECH
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