A kind of breathable material for converter and its preparation method

A gas-permeable material and converter technology, applied in applications, ceramic products, household appliances, etc., can solve the problems of poor corrosion resistance, uneven distribution of fine powder, low high-temperature strength, etc., and achieve high room temperature flexural strength, stable gas permeability, The effect of high temperature flexural strength

Active Publication Date: 2021-09-03
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In actual use, the breathable materials mainly have problems such as unstable air permeability, poor corrosion resistance, and low high-temperature strength.
The existence of the above problems affects the normal rhythm of the iron and steel smelting process and reduces work efficiency
[0004] In the existing preparation technology of breathable materials, additives are introduced to promote material sintering and improve bonding strength, but the formed low melting point liquid phase reduces the mechanical strength of breathable materials; micropowder is introduced to enhance the densification of the structure and improve the erosion resistance, However, it will affect the air permeability of the product, and the uneven distribution of fine powder will reduce the stability of the product structure and performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] A gas-permeable material for a converter and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0060] In the first step, 45-55wt% magnesia fine powder, 5-10wt% magnesia-aluminum spinel fine powder, 1-5wt% α-Al 2 o 3 Micropowder, 5-10wt% aluminum hydroxide, 1-5wt% aluminum fluoride, 1-5wt% anhydrous magnesium sulfate, 1-5wt% zinc oxide, 1-5wt% dodecylbenzenesulfonic acid Sodium, 1-5wt% fatty alcohol polyoxyethylene ether sodium sulfate, 0.1-1wt% sodium tripolyphosphate and 1-5wt% calcium aluminate cement are mixed to obtain a mixture, and 15-20wt of the mixture is added % water, stirred evenly, poured and molded, cured for 10-16 hours to obtain a solidified green body.

[0061] The second step is to dry the cured body at 90-120°C for 12-18 hours, and then heat-treat it at 1450-1550°C for 5-7 hours to obtain pre-fired material; The material is crushed and sieved to obtain granular material A with a particle size of l...

Embodiment 2

[0066] A gas-permeable material for a converter and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0067] In the first step, 50-60wt% magnesia fine powder, 1-5wt% magnesia-aluminum spinel fine powder, 5-10wt% α-Al 2 o 3 Micropowder, 1-5wt% aluminum hydroxide, 5-10wt% aluminum fluoride, 5-10wt% anhydrous magnesium sulfate, 1-5wt% titanium dioxide, 1-5wt% sodium lauryl sulfate, 1 ~5wt% sodium carboxymethylcellulose, 0.1~1wt% sodium hexametaphosphate and 1~5wt% calcium aluminate cement are mixed to obtain a mixture, and then 10~16wt% of water is added to the mixture, and stirred homogeneous, casting and curing for 15 to 20 hours to obtain a solidified green body.

[0068] The second step is to dry the cured green body at 90-120°C for 15-20 hours, and then heat-treat at 1500-1600°C for 5-7 hours to obtain pre-fired material; The material is crushed and sieved to obtain granular material A with a particle size of less than ...

Embodiment 3

[0073] A gas-permeable material for a converter and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0074] The first step, 40-50wt% magnesia fine powder, 1-5wt% magnesia-aluminum spinel fine powder, 5-10wt% α-Al 2 o 3 Micropowder, 5-10wt% aluminum hydroxide, 1-5wt% aluminum fluoride, 5-10wt% anhydrous magnesium sulfate, 1-5wt% titanium dioxide, 1-5wt% sodium lauryl sulfate, 1 ~5wt% sodium carboxymethylcellulose, 0.1~1wt% sodium hexametaphosphate and 1~5wt% calcium aluminate cement are mixed to obtain a mixture, and then 15~20wt% of water is added to the mixture, and the mixture is stirred Uniform, pouring molding, curing for 10 to 16 hours to obtain a solidified green body.

[0075] The second step is to dry the cured body at 90-120°C for 18-24 hours, and then heat-treat it at 1400-1500°C for 5-7 hours to obtain pre-fired material; The material is crushed and sieved to obtain granular material A with a particle size of ...

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Abstract

The invention relates to a breathable material for a converter and a preparation method thereof. Its technical scheme is: magnesia fine powder, magnesium aluminum spinel fine powder, α‑Al 2 o 3 Mix micropowder, aluminum hydroxide, aluminum fluoride, anhydrous magnesium sulfate, additives, foaming agent, foam stabilizer, water reducer and calcium aluminate cement, add water, stir, form, cure, dry, 1400~1600℃ Heat treatment, crushing, and sieving to obtain granular material A with a particle size of less than 0.25 mm and granular material B with a particle size of 0.25-1 mm. The modified resin is obtained by mixing thermosetting phenolic resin, surface active agent, elemental silicon powder, copper powder and ammonium metavanadate. Then, the magnesia particles, the granular material A, the granular material B, the flake graphite and the modified resin are mixed, formed by isostatic pressing, and heat-treated at 100-300 DEG C to obtain the air-permeable material for the converter. The invention has low production cost, and the prepared air-permeable material for the converter has high high-temperature flexural strength, stable air permeability, excellent erosion resistance and long service life.

Description

technical field [0001] The invention belongs to the technical field of breathable materials. Specifically relates to a breathable material for a converter and a preparation method thereof. Background technique [0002] Ventilation brick is an important functional element for the smooth implementation of the refining process outside the furnace, and plays a vital role in the reliability and completeness of the refining process outside the furnace. With the gradual increase of converter capacity and life expectancy, higher requirements are put forward for converter permeable bricks. In addition to being eroded by molten steel and slag erosion, converter bottom-blown permeable bricks also bear the stress caused by temperature changes. Therefore, the permeable bricks are required to meet performance requirements such as strength, corrosion resistance, and thermal shock stability. [0003] In actual use, the main problems of breathable materials are unstable air permeability, p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/00C04B35/043
CPCC04B35/043C04B38/0041C04B2235/3217C04B2235/3222C04B2235/445C04B2235/77C04B2235/96C04B2235/9607C04B38/0074C04B38/0067
Inventor 王周福王浩刘浩王玺堂马妍
Owner WUHAN UNIV OF SCI & TECH
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