Method for preparing lightweight microporous magnesium raw material

A microporous, magnesia technology, applied in the field of refractory materials, can solve the problems of high thermal conductivity of magnesia refractory products, and achieve the effects of low thermal conductivity, good alkali corrosion resistance, and low volume density

Inactive Publication Date: 2017-05-31
TONGDA REFRACTORY TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method of light microporous magnesia raw material, which solves the problem of high thermal conductivity of magnesia refractory products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A preparation process of light microporous magnesia raw materials. According to weight percentage, the raw materials are composed of: 5% light calcined magnesium powder, 95% magnesite powder, plus 4% pulp waste liquid as binder. During production, various raw materials are firstly weighed according to the ratio, mixed evenly in a ball mill to obtain mud, and finally pressed into shape by a press, dried in a drying kiln for 24 hours, and then fired in a high-temperature kiln at 1560°C. Make the product of the present invention.

[0019] The performance index of the obtained product is: the average pore diameter is 5.4um, the apparent porosity is 26.5%, and the bulk density is 2.65g / cm 3 .

Embodiment 2

[0021] The production process is the same as that of Example 1, except that the raw materials are composed of 40% calcined magnesium powder, 60% magnesite powder, and 5% pulp waste liquid as a binder in terms of weight percentage. The performance indicators of the obtained product are: the average pore diameter is 6.9um, the apparent porosity is 21.5%, and the bulk density is 2.88g / cm 3 .

Embodiment 3

[0023] The production process is the same as that of Example 1, except that the raw materials are composed of 95% calcined magnesium powder, 5% magnesite powder, and 6% pulp waste liquid as a binder in terms of weight percentage. The performance index of the obtained product is: the average pore diameter is 8.2um, the apparent porosity is 16.5%, and the bulk density is 2.97g / cm 3 .

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Abstract

The invention relates to a method for preparing a lightweight microporous magnesium raw material, and belongs to the technical field of refractory materials. The steps and parameters are as follows: preparingcaustic-burned magnesia powder with granularity smaller than 0.080mm, magnesite powder granularity not greater than 0.080mm and pulp waste raw material with specific gravity of 1.0-1.6g / cm3; performing ball grinding on 5-95wt% of caustic-burned magnesia powder and 5-95wt% of magnesite powder for 1-5h in a ball mill, and mixing the mixture with the pulp waste accounting for 3-8% of the total weight; pressing green bricks by using a press machine; and drying, sintering and cooling to the room temperature, and discharging the finished products from the kiln. The lightweight microporous magnesium raw material has the advantages of having good mechanical properties under normal temperature and high temperature while on the premise of ensuring no obvious reduction of the alkali erosion resistance of the material; reducing the load of the cylinder body while reducing the temperature of the cylinder body of the high-temperature kiln, and thus realizing the purposes of saving energy and reducing the consumption.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a preparation method of light microporous magnesia raw materials. Background technique [0002] With the rapid growth of our country's economy, our country's construction has made great achievements, but at the cost of the loss of resources and the destruction of the environment. The contradiction between the fast-growing economy and the worsening environment is becoming more and more prominent, and energy conservation and emission reduction have gradually become the focus of everyone's attention. Especially in the high-temperature industry, the lightweight of refractory materials for steel, cement and other industrial uses can reduce the thermal stress of the material structure by reducing the thermal conductivity and improve the thermal shock resistance without reducing the key properties such as material strength and corrosion resistance. It can not o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/06C04B35/66C04B35/043
CPCC04B38/0665C04B35/043C04B2235/96
Inventor 马淑龙王治峰马飞朱凌云周晓伟张积礼倪高金高长贺
Owner TONGDA REFRACTORY TECH CO LTD
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