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Steel ladlethermal insulationng castable as well as application thereof

A castable and ladle technology, which is applied in the field of refractory materials, can solve the problems of adverse production effects, low cost performance, and large temperature drop of molten steel, and achieve the effects of low cost, high closed porosity, and reduced temperature drop of molten steel

Active Publication Date: 2018-12-18
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the ladle lining is mostly made of aluminum-magnesium castables, which have disadvantages such as high volume density, high thermal conductivity, large heat loss, and low cost performance, resulting in a large temperature drop of molten steel, which has a negative impact on production and high energy consumption.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A ladle thermal insulation castable, its raw material mass percentage composition (%) is: mullite 56%, coke gemstone 8%, andalusite 5%, clay powder 2%, magnesite fine powder 15%, alumina micropowder 3% %, silica micropowder 2%, calcium aluminate cement 9%, sodium tripolyphosphate plus 0.2%, water plus 9%.

[0018] Stir the above castable material evenly and cast it into shape. The obtained sample is cured at room temperature for 72 hours, baked at 110°C for 24 hours to obtain a refractory material, and tested after firing at 1300°C for 3 hours. The apparent porosity of the refractory material is measured to be 19.6 %, bulk density is 2.45g / cm 3 , with a compressive strength of 121MPa, suitable for permanent ladle lining.

Embodiment 2

[0020] A ladle thermal insulation castable, its raw material mass percentage composition (%) is: mullite 50%, coke gemstone 11%, andalusite 9%, clay powder 6%, magnesite fine powder 8%, alumina micropowder 4% %, silica micropowder 4%, calcium aluminate cement 6%, polystyrene ball 2% (immerse in silica sol for more than 48 hours before use, and dry at 110°C after immersion treatment), sodium tripolyphosphate 0.2%, plus 8% in water.

[0021] Stir the above castable material evenly and cast it into shape. The obtained sample is cured at room temperature for 72 hours, baked at 110°C for 24 hours to obtain a refractory material, and tested after firing at 1300°C for 3 hours. The apparent porosity of the refractory material is measured. 25.4%, the bulk density is 2.31g / cm 3 , the compressive strength is 86MPa, and the thermal conductivity is 0.93W·(m·K) at 1000℃ -1 , suitable for ladle lining.

Embodiment 3

[0023] A ladle thermal insulation castable, its raw material mass percentage composition (%) is: mullite 45%, coke gemstone 15%, andalusite 8%, clay powder 5%, magnesite fine powder 4%, alumina micropowder 6% %, silica micropowder 2%, calcium aluminate cement 5%, polystyrene ball 10% (immerse in silica sol for more than 48 hours before use, and dry at 110°C after immersion treatment), sodium tripolyphosphate 0.3%, plus 5% in water.

[0024] Stir the above castable material evenly and cast it into shape. The obtained sample is cured at room temperature for 72 hours, baked at 110°C for 24 hours to obtain a refractory material, and tested after firing at 1300°C for 3 hours. The apparent porosity of the refractory material is measured. 38.2%, the bulk density is 2.05g / cm 3 , the compressive strength is 48MPa, and the thermal conductivity is 0.75W·(m·K) at 1000℃ -1 , suitable for ladle cover.

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PUM

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Abstract

The invention relates to steel ladle thermal insulationinsulating castable as well as an application thereof. The steel ladle thermal insulationinsulating castable is prepared from the following raw materials by mass percentage: 45 to 65 percent of mullite, 8 to 15 percent of flint clay, 5 to 12 percent of andalusite, 2 to 8 percent of clay powder, 4 to 15 percent of magnesite fine powder, 3 to 6percent of aluminum oxide micro powder, 2 to 6 percent of silicon oxide micro powder, 5 to 9 percent of calcium aluminate cement, 0.2 to 0.3 percent of an addition additive, and 5 to 9 percent of additionwater. The steel ladle thermal insulationinsulating castable provided inby the invention is applicable to different parts such as steel ladle furnace liners, permanent layers and ladle covers, high in pressure resisting strength, low in cost, high in closed porosity, and good in insulating effect, can reduce the heat radiation of the molten steel cooling and steel ladle shell without increasing the thickness of the furnace liner and influencing the original masonry process, can improve the stability of the molten steel temperature and the continuous casting pouring efficiency, can alleviate the high-temperature radiation damage for relevant devices, can reduce the temperature fluctuation of a refractory material, and can prolong the service life of the refractory material.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and relates to a ladle thermal insulation castable and its application. Background technique [0002] The ladle is an important refining equipment outside the furnace in iron and steel smelting. With the development of secondary refining and continuous casting technology, the residence time of molten steel in the ladle is prolonged. In order to reduce the temperature drop of molten steel, higher requirements are put forward for the heat preservation and energy saving effect of the ladle. . [0003] At present, most of the ladle linings are made of aluminum-magnesium castables, which have disadvantages such as high bulk density, high thermal conductivity, large heat loss, and low cost performance, resulting in a large temperature drop of molten steel, which has a negative impact on production and high energy consumption. [0004] The invention improves the heat insulation effect of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66B22D41/02
CPCB22D41/02C04B35/66C04B2235/3206C04B2235/3217C04B2235/3418C04B2235/3463C04B2235/349
Inventor 张洪雷张利峰陶晓林杨运超刘黎徐国涛
Owner 武汉钢铁有限公司
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