Refractory castable for desulfurizing spray gun for pretreating molten iron

A pretreatment technology for refractory castables and molten iron, applied in the field of refractory materials, can solve the problems of reduced service life of desulfurization spray guns, increase desulfurization powder, etc., achieve good thermal shock resistance, improve thermal shock resistance, and reduce cracks.

Active Publication Date: 2012-12-26
上海彭浦特种耐火材料厂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • 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
  • Refractory castable for desulfurizing spray gun for pretreating molten iron
  • Refractory castable for desulfurizing spray gun for pretreating molten iron

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Embodiment Construction

[0024] The substantive features and significant progress of the present invention will be further clarified below through specific examples and comparison with the characteristics of the currently used refractory castables.

[0025] In the first column of Table 2, the original ratio means the thermal shock resistance of the refractory castable without adding coke gemstone, andalusite and mullite ultrafine powder and the actual furnace times. The original ratio is composed of 70% fused Mo Stone aggregate, 12% mullite fine powder (≤40μm), 5% alumina fine powder, 4% white corundum powder, 4% silica fine powder, 5% calcium aluminate cement, Examples 1 and 2 are to reduce electricity The amount of fused mullite aggregate is 30-40%, while increasing the amount of coke gemstone and andalusite, and substituting mullite ultrafine powder for mullite fine powder, achieved good thermal shock resistance and thermal conductivity, Thereby increasing the service life.

[0026] Table 2

[00...

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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 molten iron pretreatment desulfurization spray gun, more specifically, the provided 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 molten iron pretreatment is a functional refractory material used for desulfurization and dephosphorization of molten iron on a mixed car or a molten iron ladle. N 2 Gas transport CaO, CaC 2 , CaF 2 or Na 2 CO 3 And other powders are used to remove S, P and supplementary Si in the molten iron to reduce or eliminate the impurity elements such as sulfur, phosphorus and silicon in the molten iron. The structure of the spray gun is that the inner core is a steel pipe, and the outer part is wrapped with a high-performance mullite castable. When the spray gun is sprayed with powder at high temperature, the thermal expansion rate of the s...

Claims

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Application Information

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Patent Type & Authority Patents(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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