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A kind of ladle thermal insulation castable and its application

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

Active Publication Date: 2021-06-22
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 a steel ladle thermal insulation castable and its application. The raw material composition includes 45-65% of mullite, 8-15% of burnt gemstone, 5-12% of andalusite, 2-8% of clay powder, Magnesium ore fine powder 4-15%, alumina micro-powder 3-6%, silicon oxide micro-powder 2-6%, calcium aluminate cement 5-9%, additive 0.2-0.3%, water 5-9%. The ladle thermal insulation castable provided by the invention is suitable for different parts such as ladle lining, permanent layer, and ladle cover. It has high compressive strength, low cost, high closed porosity, and good thermal insulation effect. On the basis of affecting the original masonry process, reduce the temperature drop of molten steel and the external heat radiation of the steel cladding shell, improve the temperature stability of molten steel and continuous casting casting efficiency, reduce the high temperature radiation damage of related equipment, reduce the temperature fluctuation of refractory materials, and prolong the durability material service life.

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 Patents(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