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Thermal shock resistant burner brick and preparation method thereof

A technology of burner bricks and rapid cooling resistance, which is applied in the field of refractory materials, can solve the problems of low-melting materials and long-term use, and achieve the effects of easy operation and control, high strength, and simple and rapid preparation process

Inactive Publication Date: 2008-05-21
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, practice has proved that low-melting substances are produced during its use and cannot be used for a long time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh the above-mentioned ready-to-use raw materials by weight percentage respectively:

[0031] Aluminum powder: 30wt%,

[0032] High alumina bauxite aggregate and bauxite fine powder: 14wt%,

[0033] Chromium oxide powder: 56wt%,

[0034] Sodium fluoride powder (additional): 1.5wt%,

[0035] And the pulp solution that is 10g: 1.4ml with the above-mentioned mixture ratio.

[0036] Its preparation process is:

[0037] Mix the aluminum powder, high-alumina bauxite aggregate, bauxite fine powder, chromium oxide powder and sodium fluoride powder prepared in the above ratio evenly, then add the pulp solution at a ratio of 10g: 1.4ml, and fully mix and stir uniform. Put the uniformly mixed raw materials into a molding machine, and press them into compacts under a pressure of 100 MPa. Put the compact into a drying kiln and dry it at 200°C for 2 hours. Sprinkle an igniting agent on the surface of the dried compact (the preparation process of the igniting agent: CrO 3 M...

Embodiment 2

[0041] The aforementioned ready-to-use raw materials are weighed in percent by weight:

[0042] Aluminum powder: 26wt%,

[0043] High alumina bauxite aggregate and bauxite fine powder: 25wt%,

[0044] Chromium oxide powder: 49wt%,

[0045] Sodium fluoride powder (additional): 1.5wt%,

[0046] And the phosphate solution that is 10g: 0.6ml with the above-mentioned mixture ratio.

[0047] Mix the aluminum powder, high-alumina bauxite aggregate, bauxite fine powder, chromium oxide powder and sodium fluoride powder prepared according to the above ratio, add phosphate solution, and mix well; put it into the molding machine, use 60MPa pressure to make compact; put into drying kiln and dry at 300°C for 2 hours; sprinkle igniting agent on the surface of the dried compact (the preparation process of igniter: CrO 3 Mix evenly with Al at a molar ratio of 1:3, CrO 3and Al particle size are less than 0.14mm), the igniter is ignited with a energized tungsten wire to self-sinter the comp...

Embodiment 3

[0050] The aforementioned ready-to-use raw materials are weighed in percent by weight:

[0051] Aluminum powder: 24wt%,

[0052] High alumina bauxite aggregate and bauxite fine powder: 31wt%,

[0053] Chromium oxide powder: 45wt%,

[0054] Sodium fluoride powder (additional): 1.5wt%,

[0055] A pulp solution with a ratio of 10g: 1ml to the above-mentioned mixture.

[0056] After mixing the prepared aluminum powder, high-alumina bauxite aggregate, bauxite fine powder, chromium oxide powder and sodium fluoride powder, add the pulp solution and mix evenly; press 90MPa on the molding machine to make a compact; Dry in a drying kiln at a temperature of 300°C for 2 hours; sprinkle an igniting agent on the surface of the dried compact (the preparation process of the igniting agent: CrO 3 Mix evenly with Al at a molar ratio of 1:3, CrO 3 and Al particle size are less than 0.14mm), the igniter is ignited with a energized tungsten wire to self-sinter the compact. Finally, the coole...

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Abstract

The invention relates to a rapid cooling and rapid heating burner brick and a preparation method thereof. The raw material components are: 24% to 30% of aluminum powder, 14% to 31% of high alumina bauxite aggregate and bauxite fine powder, and chromium oxide powder 45% to 56%, plus 1% to 2% of sodium fluoride powder and a binder with a ratio of 10g: 0.6 to 1.4ml of raw materials. After mixing the raw materials evenly, make compacts under the pressure of 60-100MPa; dry at 200-300°C for 2 hours; ignite the ignition agent with energized tungsten wire to self-sinter the compacts; Processed into burner bricks. After testing, the compressive strength at room temperature is 30-50MPa, the thermal conductivity is 0.9-1.1W / m·℃, and the refractoriness is 1790-1800℃; under the condition of 800℃ water cooling, the thermal shock stability is more than 50 times, which avoids the sharp change of furnace temperature As for the problem of peeling, no low-melting material is produced during use, and the service life can reach more than half a year, and the preparation process is simple, easy to operate and control.

Description

technical field [0001] The invention belongs to the field of refractory materials. Specifically, it is a burner brick with high thermal shock stability for various metallurgical furnace burners and a preparation method thereof. Background technique [0002] Heating furnaces and soaking furnaces are thermal equipment used to heat billets or ingots during steel rolling or forging, while burner bricks are refractory products used at the burner part to inject fuel and organize flames. The working temperature of burner bricks is generally 1400-1500°C. Burner bricks not only need good fire resistance and thermal shock resistance, but also have good resistance to high-temperature airflow erosion and smoke erosion. [0003] For many years, the burner bricks used in heating furnaces and soaking furnaces have been made of bauxite cement combined with high-alumina refractory castables. The burner bricks have a short service life, generally only 3 to 6 months....

Claims

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Application Information

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IPC IPC(8): C04B35/66F23D14/48
Inventor 杨大正徐大勇刘常鹏邓伟张宇高峰
Owner ANGANG STEEL CO LTD
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