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Refractory castable for desulfurizing spray gun for pretreating molten iron

A technology of refractory castables and desulfurization spray guns, which is applied in the field of refractory materials, can solve the problems of reduced service life of desulfurization spray guns, increase of desulfurization powder, etc., and achieve the effects of improving thermal shock stability, reducing dosage, and increasing service life

Active Publication Date: 2010-09-29
上海彭浦特种耐火材料厂有限公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

However, with the continuous increase in the demand for high-grade and special steel in various industries, the content of impurities such as sulfur and phosphorus in molten iron is required to be lower and lower. To achieve the goal of ultra-low sulfur and phosphorus, so that the time for the desulfurization spray gun to process a furnace of molten iron is increased from about 10 minutes to 30-40 minutes, resulting in a significant decrease in the service life of the desulfurization spray gun

Method used

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  • Refractory castable for desulfurizing spray gun for pretreating molten iron

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Embodiment Construction

[0024] The following specific examples and comparison with the characteristics of the refractory castables currently used will further clarify the substantial features and significant progress of the present invention.

[0025] The original ratio in the first column of Table 2 means the thermal shock resistance of the refractory castable and the actual heats when the superfine powder of coke, andalusite and mullite is not added. The original ratio is 70% fused Mo Comes stone aggregate, 12% mullite fine powder (≤40μm), 5% alumina powder, 4% white corundum powder, 4% silica powder, 5% calcium aluminate cement, Examples 1 and 2 are for reducing electricity The amount of molten mullite aggregate is 30-40%, while increasing the amount of scorched gemstone and andalusite, and replacing mullite fine powder with mullite ultrafine powder, has achieved good thermal shock resistance and thermal conductivity. Thereby improving the life span of use.

[0026] Table 2

[0027]

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Abstract

The invention provides a refractory castable for a desulfurizing spray gun for pretreating molten iron, which has lower thermal conductivity and higher thermal shock resistance. The invention is characterized in that 10-50% of flint clay and 5-40% of andalusite are added to aggregate, and 2-15% of mullite ultramicro powder is also added to the aggregate. Thus, on the premise of ensuring that the refractory castable has sufficient corrosion resistance and high strength, the invention further reduces the thermal conductivity of the refractory castable, enhances the shock resistance of the refractory matter, reduces the possibility of cracking, prevents cracks from expanding and greatly prolongs the service life of the desulfurizing spray gun from 18 kilns to about 35 kilns.

Description

Technical field [0001] The invention relates to a refractory castable for a molten iron pretreatment desulfurization spray gun. More specifically, the refractory castable has lower thermal conductivity and better thermal shock resistance, and belongs to the field of refractory materials. Background technique [0002] The spray gun for hot metal pretreatment is a functional refractory material used for desulfurization and dephosphorization of molten iron on a mixing car or a molten iron ladle. When in use, it is inserted into the high temperature molten iron in the mixing car or molten iron. N 2 Air transport CaO, CaC 2 , CaF 2 Or Na 2 CO 3 Other powders are used to remove S, P and supplementary Si removal of molten iron to reduce or eliminate impurity elements such as sulfur, phosphorus, and silicon in molten iron. The structure of the spray gun is a steel tube with a high-performance mullite castable on the outside. Because the thermal expansion rate of the steel pipe when the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 高仁骧赵玲娣
Owner 上海彭浦特种耐火材料厂有限公司
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