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Refractory material for steel tapping hole of converter and preparation method for refractory material

A refractory material and tapping hole technology, applied in the field of refractory materials, can solve problems affecting the performance and life of the converter tapping hole, reduce service life, restrict production efficiency, etc., and achieve excellent thermal shock stability and long life.

Active Publication Date: 2017-05-10
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The taphole of the converter will be scoured and eroded by the high temperature of molten steel during tapping. At the same time, the taphole of the magnesia-carbon brick will undergo oxidation reaction due to various factors such as the atmosphere in the molten steel at high temperature, which will greatly reduce the service life; The refractory material at the taphole before and after the first tapping is also affected by the rapid temperature change. In the long run, the refractory material will deteriorate and be damaged under the combined action of various above factors, which will significantly affect the performance and life of the converter taphole
At present, magnesia-carbon materials are mostly used in the taphole of the converter. Although the magnesia-carbon material with flake graphite content greater than 10% has good thermal shock resistance, it still cannot meet the needs of the taphole, and the structure of the flake graphite after oxidation Become loose, thermal shock resistance and molten steel erosion resistance further decline
At present, the general service life of the taphole of the converter is 5-7 days, and the tapping time is about 120 furnaces. The life of the refractory material of the taphole does not match that of the refractory material of other parts of the converter, and the furnace shutdown is caused by the long replacement time of the refractory material of the taphole. , cooling, etc. have become a major factor restricting production efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A converter tapping hole refractory material and a preparation method thereof. The preparation method described in this example is: spray a layer of glaze slurry on the surface of the magnesia-carbon brick body, the coating thickness of the glaze slurry is 1-2mm; dry at 110°C for 12-24 hours, heat up to 240°C, Keeping the temperature for 24 hours, the refractory material for the tap hole of the converter is obtained.

[0033] The raw materials and contents of the magnesia-carbon brick body are: 55-61wt% of fused magnesia particles, 17-20wt% of magnesia fine powder, 1-3wt% of artificial graphite particles, and 8-10wt% of granulated graphite %, expanded graphite is 0.2~0.8wt%, flake graphite fine powder is 4~5wt%, aluminum powder is 1~1.7wt%, silicon powder is 1.6~2wt%, and phenolic resin is 3.4~4wt%.

[0034] According to the raw material and content of the magnesia-carbon brick body, magnesia fine powder, flake graphite fine powder, expanded graphite, aluminum powder a...

Embodiment 2

[0040] A converter tapping hole refractory material and a preparation method thereof. The preparation method described in this example is: spray a layer of glaze slurry on the surface of the magnesia-carbon brick body, the coating thickness of the glaze slurry is 1-2mm; dry at 110°C for 12-24 hours, heat up to 240°C, Keeping the temperature for 24 hours, the refractory material for the tap hole of the converter is obtained.

[0041]The raw materials and contents of the magnesia-carbon brick body are: 61-67wt% of fused magnesia particles, 12-17wt% of magnesia fine powder, 3-5wt% of artificial graphite particles, and 7-9wt% of granulated graphite %, expanded graphite is 0.8~1.4wt%, flake graphite fine powder is 3~4wt%, aluminum powder is 1.7~2.3wt%, silicon powder is 1.3~1.7wt%, and phenolic resin is 2.7~3.4wt%.

[0042] According to the raw material and content of the magnesia-carbon brick body, magnesia fine powder, flake graphite fine powder, expanded graphite, aluminum powd...

Embodiment 3

[0048] A converter tapping hole refractory material and a preparation method thereof. The preparation method described in this example is: spray a layer of glaze slurry on the surface of the magnesia-carbon brick body, the coating thickness of the glaze slurry is 1-2mm; dry at 110°C for 12-24 hours, heat up to 240°C, Keeping the temperature for 24 hours, the refractory material for the tap hole of the converter is obtained.

[0049] The raw materials and contents of the magnesia-carbon brick body are: 67-72wt% of fused magnesia particles, 7-12wt% of magnesia fine powder, 2-4wt% of artificial graphite particles, and 5-7wt% of granulated graphite %, expanded graphite is 1.4~2wt%, flake graphite fine powder is 2~3wt%, aluminum powder is 2.3~3wt%, silicon powder is 1~1.4wt%, and phenolic resin is 2~2.7wt%.

[0050] According to the raw material and content of the magnesia-carbon brick body, magnesia fine powder, flake graphite fine powder, expanded graphite, aluminum powder and s...

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Abstract

The invention relates to a refractory material for a steel tapping hole of a converter and a preparation method for the refractory material. The technical scheme of the invention is as follows: the preparation method comprises the steps of spraying the surface of a magnesia-carbon brick body with a glaze slip coating with the thickness of 1mm to 2mm, carrying out drying, and carrying out heat preservation, thereby preparing the refractory material for the steel tapping hole of the converter. A preparation method for the magnesia-carbon brick body comprises the steps: mulling magnesia fines, flake graphite fines, expandable graphite, aluminum powder and silicon powder in a high-speed mulling machine, so as to prepare mixed fine powder; and then, mulling fused magnesia granules and artificial graphite granules, adding phenol-formaldehyde resin into the mixture, carrying out mulling, then, adding granulated graphite and the mixed fine powder into the mulled mixture, carrying out mulling, carrying out aging, carrying out shaping, and carrying out standing, thereby preparing the magnesia-carbon brick body. A preparation method for glaze slip comprises the steps of adding water into glass powder, spodumene, potassium feldspar, silicon micropowder, potassium carbonate, SiC fines, chrome green and aluminum dihydrogen phosphate, which serve as raw materials of the glaze slip, and carrying out grinding, thereby preparing the glaze slip. The refractory material for the steel tapping hole of the converter, prepared by the preparation method, has the characteristics that the thermal shock stability is good, the integrity is good, the oxidation resistance is good, the erosion resistance is good, and the life is long.

Description

technical field [0001] The invention belongs to the technical field of refractory materials. In particular, it relates to a converter tapping hole refractory material and a preparation method thereof. [0002] technical background [0003] The converter taphole is the pipeline through which the smelted molten steel enters the ladle from the converter. Its structure and quality have a direct impact on the product quality, production cycle, production stability and efficiency of molten steel smelting. The material and life are the guarantee of production safety. , The number of times the converter taphole is used is one of the comprehensive manifestations of the converter smelting index. [0004] The taphole of the converter will be scoured and eroded by the high temperature of molten steel during tapping. At the same time, the taphole of the magnesia-carbon brick will undergo oxidation reaction due to various factors such as the atmosphere in the molten steel at high temperat...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/043C04B41/86C03C8/00
CPCC03C8/00C04B35/043C04B35/63476C04B41/5022C04B41/86C04B2235/402C04B2235/425C04B2235/428C04B2235/77C04B2235/96C04B2235/9623
Inventor 桑绍柏徐晓阳李亚伟徐小峰徐义彪王庆虎
Owner WUHAN UNIV OF SCI & TECH
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