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Gate valve sliding plate brick for slag retaining of converter and preparation method thereof

A converter slag blocking and sliding brick technology, which is applied in the field of refractory materials, achieves the effects of simple preparation method, low energy consumption, and reduced transverse cracks and fractures

Inactive Publication Date: 2017-05-10
瑞泰马钢新材料科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, adding an appropriate amount of expanded graphite can increase the strength and toughness of the material, while reducing the carbon content in the material, but there are few reports at home and abroad on the introduction of expanded graphite into aluminum-zirconium-carbon sliding bricks.

Method used

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  • Gate valve sliding plate brick for slag retaining of converter and preparation method thereof
  • Gate valve sliding plate brick for slag retaining of converter and preparation method thereof
  • Gate valve sliding plate brick for slag retaining of converter and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A gate valve sliding brick for converter slag, the composition of which is as follows by weight percentage: 25% of tabular corundum particles, 40% of zirconium corundum particles, 5% of tabular corundum fine powder, 5% of zirconium corundum fine powder, and 10% of white corundum fine powder %, α-Al 2 o 3 2.5% of fine powder, 1.8% of flake graphite, 0.7% of expanded graphite, 4% of metal aluminum powder, 4% of metal silicon powder, 2% of boron carbide, plus 5% of phenolic resin, of which:

[0035]

[0036] In this embodiment, the chemical composition of the tabular alumina is: Al 2 o 3 ≥98.5%, the pH value is neutral; the chemical composition of zirconium corundum is: Al 2 o 3 +ZrO 2 ≥98% and ZrO 2 ≥23%.

[0037] In this embodiment, the expansion factor of the expanded graphite is 150 times.

Embodiment 2

[0039] A gate valve sliding brick for converter slag, the composition of which is as follows by weight percentage: 20% of tabular corundum particles, 45% of zirconium corundum particles, 3% of tabular corundum fine powder, 3% of zirconium corundum fine powder, and 10% of white corundum fine powder %, α-Al 2 o 3 Micropowder 4%, flake graphite 1.5%, expanded graphite 1%, metal aluminum powder 5%, metal silicon powder 5%, boron carbide 2.5%, plus phenolic resin 5%, of which:

[0040]

[0041]

[0042] In this embodiment, the chemical composition of the tabular alumina is: Al 2 o 3 ≥98.5%, the pH value is neutral; the chemical composition of zirconium corundum is: Al 2 o 3 +ZrO 2 ≥98% and ZrO 2 ≥23%.

[0043] In this embodiment, the expansion factor of the expanded graphite is 200 times.

Embodiment 3

[0045] A gate valve sliding brick for converter slag, the composition of which is as follows by weight percentage: 30% of tabular corundum particles, 30% of zirconium corundum particles, 6% of tabular corundum fine powder, 6% of zirconium corundum fine powder, and 10% of white corundum fine powder %, α-Al 2 o 3 4% micropowder, 1% flake graphite, 1.5% expanded graphite, 4.5% metal aluminum powder, 4.5% metal silicon powder, 2.5% boron carbide, plus 5% phenolic resin, of which:

[0046]

[0047] In this embodiment, the chemical composition of the tabular alumina is: Al 2 o 3 ≥98.5%, the pH value is neutral; the chemical composition of zirconium corundum is: Al 2 o 3 +ZrO 2 ≥98% and ZrO 2 ≥23%.

[0048] In this embodiment, the expansion factor of the expanded graphite is 300 times.

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Abstract

The invention discloses a gate valve sliding plate brick for slag retaining of a converter and a preparation method thereof. Based on the total amount of 100 percent, the brick comprises the following components in percentage by weight: 20 to 30 percent of tabular corundum particles, 30 to 45 percent of zirconia corundum particles, 5 to 10 percent of tabular corundum fine powder, 5 to 10 percent of zirconia corundum fine powder, 5 to 20 percent of white corundum fine powder, 0 to 5 percent of alpha-Al2O3, 1 to 4 percent of flake graphite, 0 to 2 percent of expanded graphite, 0 to 5 percent of aluminum metal powder, 0 to 5 percent of silicon metal powder, 0 to 3 percent of boron carbide and 4 to 6 percent of additional phenolic resin. According to the gate valve sliding plate brick and the preparation method thereof, the service life of the brick on 100-ton converters is prolonged from original 10 to 12 converters to 13 to 15 converters, and is basically equivalent to that of a zirconia plate embedded gate valve sliding plate; compared with a conventional alumina-zirconia-carbon gate valve sliding plate, a sliding plate for which the brick is used has the advantages that transverse cracking and fracturing phenomena of the sliding plate are remarkably reduced, and the thermal shock resistance is obviously improved, the surface of the plate is smooth, the erosion pore expanding rate is low, the number of continuous using times is increased, and the safety is improved.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a gate valve slide brick for slag retaining in a converter and a preparation method thereof. Background technique [0002] Gate valve sliding bricks for converter slag are directly subjected to high-temperature molten steel scouring and oxidation by highly oxidizing atmospheres, as well as frequent rapid cooling and rapid heating, so the requirements for thermal shock resistance, oxidation resistance and erosion resistance of refractory materials are extremely stringent. At present, the material of gate valve sliding bricks for converter slag blocking at home and abroad includes conventional re-burned aluminum-zirconium carbon and the composite structure of re-burned aluminum-zirconium carbon sliding plate for the body and zirconium material for the mosaic layer. The service life of conventional reburned aluminum-zirconium-carbon materials is 10-12 furnac...

Claims

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Application Information

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IPC IPC(8): C04B35/106C04B35/622C04B41/87C21C5/46
CPCC04B35/106C04B35/622C04B41/5001C04B41/87C04B2235/3821C04B2235/402C04B2235/425C04B2235/428C04B2235/5436C21C5/4653C04B41/4535C04B41/0072
Inventor 彭学峰李亚伟郁书中崔任渠陈波
Owner 瑞泰马钢新材料科技有限公司
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