A kind of magnesium breathable material for tundish and preparation method thereof

A breathable material and tundish technology, applied in the field of magnesium breathable materials, can solve problems such as large bubble diameter, low product strength, complex process, etc., and achieve high temperature flexural strength, high room temperature flexural strength, and stable air permeability Effect

Inactive Publication Date: 2021-06-15
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, it is usually formed by pouring, and the plastic belt or metal tube fixed on the mold is placed in the product preparation process. The process is more complicated, and the bubbles in the formed air curtain are relatively large; by adjusting the accumulation of raw material particles Controlling the pore structure also has the problem of large bubble diameter, and the product has low strength and unstable air permeability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A magnesium gas permeable material for a tundish and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0046] 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, 1-10wt% anhydrous magnesium sulfate, 1-5wt% zinc oxide, 1-5wt% dodecylbenzenesulfonic acid Sodium, 1-5wt% fatty alcohol polyoxyethylene ether sodium sulfate, 0.1-1wt% sodium hexametaphosphate 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 10-15 hours to obtain a solidified green body.

[0047] The second step is to dry the cured green body at 90-120°C for 18-24 hours, and then heat-treat 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 particl...

Embodiment 2

[0052] A magnesium gas permeable material for a tundish and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0053] 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, 1-10wt% anhydrous magnesium sulfate, 1-5wt% zinc oxide, 1-5wt% dodecylbenzenesulfonic acid Sodium, 1-5wt% fatty alcohol polyoxyethylene ether sodium sulfate, 0.1-1wt% sodium hexametaphosphate and 1-5wt% calcium aluminate cement are mixed to obtain a mixture; and 10-15wt of the mixture is added % water, stirred evenly, poured and molded, cured for 15-20 hours to obtain a solidified green body.

[0054] The second step is to dry the cured body at 90-120°C for 12-16 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 si...

Embodiment 3

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

[0060] The first step, 40-50wt% magnesia fine powder, 1-5wt% magnesia-aluminum spinel fine powder, 1-5wt% α-Al 2 o 3 Micropowder, 5-10wt% aluminum hydroxide, 5-10wt% aluminum fluoride, 1-10wt% anhydrous magnesium sulfate, 1-5wt% titanium dioxide, 1-5wt% sodium lauryl sulfate, 1 ~5wt% sodium carboxymethylcellulose, 0.1~1wt% sodium tripolyphosphate and 1~5wt% calcium aluminate cement are mixed to obtain a mixture; add 10~15wt% water to the mixture, and stir homogeneous, casting and curing for 15 to 20 hours to obtain a solidified green body.

[0061] 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 0.25 mm and gran...

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Abstract

The invention relates to a magnesium gas-permeable material for a tundish 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, cast, solidify, dry, at 1400~ Heat treatment at 1600°C, crushing, and sieving to obtain granule A and granule B with different particle sizes. Then magnesia fine powder, α‑Al 2 o 3 The fine powder, aluminum fluoride, anhydrous magnesium sulfate, thickener, water reducer and water are mixed and stirred to obtain slurry. Then, the magnesia particles, the granular material A, the granular material B and the slurry are mixed, stirred, pressed into shape, dried, and heat-treated at 1500-1700 DEG C to obtain a magnesium gas-permeable material for a tundish. The invention has low production cost, and the prepared magnesium air-permeable material for the tundish 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 magnesium air-permeable materials. In particular, it relates to a magnesium gas-permeable material for a tundish and a preparation method thereof. Background technique [0002] In the process of research, development and application of high-purity steel production technology, the purification process of molten steel in the tundish is the key link to improve the cleanliness of molten steel. Setting the air curtain retaining wall in the tundish can not only effectively remove the inclusions in the molten steel to achieve the purpose of purifying the molten steel, but also promote the homogenization of the temperature and composition of the molten steel. [0003] In the prior art, it is usually formed by pouring, and the plastic belt or metal tube fixed on the mold is placed in the product preparation process. The process is more complicated, and the bubbles in the formed air curtain are relatively large; b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/043
CPCC04B35/043C04B2235/3217C04B2235/3222C04B2235/3284C04B2235/445C04B2235/447C04B2235/448C04B2235/77C04B2235/96C04B2235/9607
Inventor 王周福杨新帅刘浩王玺堂马妍
Owner WUHAN UNIV OF SCI & TECH
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