Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Waterproof treatment method for magnesium refractory bricks

A processing method and technology for refractory bricks are applied in the waterproof field of magnesia refractory bricks, which can solve the problems of narrow application range and unsuitable refractory bricks, etc., and achieve the effects of improving service life, high hydration resistance and compressive strength.

Inactive Publication Date: 2013-06-26
辽宁青花耐火材料股份有限公司
View PDF5 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention has high calcium oxide content, strong hydration resistance, and good high-temperature performance; it is a kind of refractory brick used in smelting and other industries. The scope of application is narrow and cannot be applied to various refractory bricks such as magnesia bricks, magnesia alumina bricks, magnesia alumina spinel bricks, magnesia chrome bricks and magnesia zirconium bricks

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Waterproof treatment method for magnesium refractory bricks
  • Waterproof treatment method for magnesium refractory bricks
  • Waterproof treatment method for magnesium refractory bricks

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The waterproof treatment of magnesia-chrome bricks used in RH refining furnace, the dipping pipe of RH refining furnace widely adopts double-layer structure: the inner lining is built with magnesia-chrome bricks, and the outer layer is made of high-alumina castables. Due to the large amount of moisture carried by the latter, it will cause hydration damage to the magnesia-chrome bricks of the working layer under high temperature conditions. Therefore, it is necessary to waterproof the magnesia-chrome bricks used in the RH refining furnace:

[0021] The chemical indicators of magnesia-chrome bricks are shown in Table 1.

[0022] Table 1

[0023] Element

burn reduction

SiO 2

Al 2 o 3

Fe 2 o 3

CaO

MgO

Cr 2 o 3

Percentage (%)

0.16

1.59

4.54

5.34

1.21

75.64

11.52

[0024] The physical indicators of magnesia-chrome bricks before impregnation are shown in Table 2.

[0025] Table 2 ...

Embodiment 2

[0040] Waterproof treatment of burnt magnesia bricks for metallurgical converters. Most metallurgical converters use double-layer masonry structures. The working layer uses magnesia-carbon bricks. Water enters the interior of the permanent layer from the furnace mouth along the furnace shell, and the formation of water vapor at high temperature will cause hydration of the permanent layer magnesia bricks, resulting in pulverization and damage of the magnesia bricks.

[0041] The chemical indicators of burnt magnesia bricks are shown in Table 5.

[0042] table 5

[0043] Burnt magnesia brick

burn reduction

SiO 2

Al 2 o 3

Fe 2 o 3

CaO

MgO

Chemical indicators

0.2

3.77

0.66

0.88

1.75

92.74

[0044] The physical indicators of the burnt magnesia bricks before impregnation are shown in Table 6.

[0045] Table 6

[0046]

[0047] Table 7

[0048]

[0049] The specific operation steps of embodimen...

Embodiment 3

[0059] Waterproof treatment of magnesia-alumina spinel bricks for parallel flow regenerative Maerz active lime kiln, most of the refractory bricks for the working layer of parallel flow regenerative Maerz active lime kiln are magnesia-alumina spinel bricks, and more fuel is used Water gas and natural gas, etc., a large amount of water brought in during combustion will condense on the upper wall of the shaft kiln and flow downward, causing hydration of the magnesia refractory bricks in the working layer; when limestone raw materials stored in the open air enter the kiln, rainwater and Ice and snow, fire clay, castables and concrete used in the masonry process will also bring additional moisture to the kiln, which will cause hydration of the magnesia-aluminum spinel bricks in the working layer during use. Therefore, the magnesia-aluminum spinel bricks used in the parallel flow regenerative Maerz active lime kiln need to be soaked in salt and waterproofed:

[0060] The chemical i...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to the field of waterproofing of magnesium refractory bricks and in particular relates to a waterproof treatment method for magnesium refractory bricks. The waterproof treatment method is characterized in that as magnesium sulphate has the characteristics of crystal water, postproduction impregnation is carried out on the magnesium refractory bricks under vacuum condition to achieve the waterproof aim; and the waterproof treatment method comprises the following concrete operational steps of: 1) preparing a magnesium sulphate solution; 2) piling up the magnesium refractory bricks and vacuumizing; 3) injecting the magnesium sulphate solution to submerge and soak the magnesium refractory bricks; and 4) taking out the magnesium refractory bricks and carrying out heat treatment. Compared with the prior art, the waterproof treatment method for the magnesium refractory bricks has the beneficial effects that the treated magnesium refractory bricks are low in gas hole ratio, the compression strength is improved, and the treated magnesium refractory bricks have high anti-hydration capability, the problem that magnesia-alumina spinel bricks in a maerz active lime shaft kiln, magnesite-chrome bricks in a working layer of an RH (relative humidity) refining furnace and fired magnesite bricks in a permanent layer of a metallurgy electric furnace and a converter are hydrated can be effectively solved, and the reduction of influence of poor conditions such as humid climate and rainy days in the south of China to properties of the magnesium refractory bricks can be facilitated, so that the service life of the magnesium refractory bricks is prolonged.

Description

technical field [0001] The invention relates to the field of waterproofing of magnesia refractory bricks, in particular to a waterproof treatment method of magnesia refractory bricks. Background technique [0002] The hydration of magnesia refractory bricks (magnesia bricks, magnesia alumina bricks, magnesia chrome bricks, etc.) is mainly caused by the chemical reaction between magnesia and water to generate magnesium hydroxide. With the continuous expansion of the reaction degree, the hydration phenomenon will become more obvious, and various hydration phenomena will appear macroscopically. After hydration, the surface of the magnesia refractory brick will be bulged, hoarfrost, loose in structure and have radioactive star-shaped cracks. At the same time, these newly generated crack surfaces will further intensify the deeper hydration, and a chain reaction will occur, which will eventually lead to the complete collapse of the magnesia refractory brick structure. Under the s...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/85C04B35/66
Inventor 郑连营潘波王健东杨晓峰范连伟
Owner 辽宁青花耐火材料股份有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com