Double-layered alkali grain covering agent for middle ladle

A technology of alkaline granule and tundish, applied in the field of thermal insulation covering agent for alkaline granule tundish, which can solve problems such as carburization of molten steel and environmental pollution

Inactive Publication Date: 2003-05-14
上海宝谊保温材料有限公司
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AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the problem that the alkaline molten steel tundish commonly used in the prior art must be

Method used

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Embodiment Construction

[0004] Below in conjunction with embodiment the present invention is described in further detail,

[0005] Prepare the bottom slag and top slag of the thermal insulation covering agent respectively, (1) bottom slag: take SiO 2 15kg, CaO 60kg, MgO 19kg, Al 2 o 3 5 kg, Fe 2 o 3 0.5 kg, 0.5 kg of fixed carbon, stirred into a mixture of 100 kg, (2) top slag to get SiO 2 92.5 kg, CaO 3 kg, MgO 1.5 kg, Al 2 o 3 2 kg, Fe 2 o 3 0.5 kg, fixed carbon 0.5 kg, stirred into 100 kg mixture. Then take 80 kg of bottom slag and 20 kg of top slag, and put them into the tundish ladle at one time. The double-layer alkaline granular molten steel tundish thermal insulation covering agent immediately forms double-layer slag. The bottom slag has a low melting point and quickly forms a molten slag layer to cover the molten steel surface. , due to the low content of low-level oxides, it can prevent the secondary oxidation of molten steel. Due to the low fixed carbon content, it wil...

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PUM

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Abstract

The present invention relates to a double-layered alkali grain heat-insulting covering agent for middle ladle. The heat-insulting covering agent consists of top slag in 10-50 wt% and bottom slag in 50-90 wt%. The bottom slag consists of SiO2 8-15 wt%, CaO 50-60 wt%, MgO 10-20 wt%, Al2O3 1-5 wt%, Fe2O3 1-3 wt%, and fixed carbon 0.01-1 wt%. The top slag consists of SiO2 85-93 wt%, CaO 0.001-3 wt%, MgO 0.001-3 wt%, Al2O3 0.001-3 wt%, Fe2O3 0.003-0.5 wt%, and fixed carbon 0.01-1 wt%. The heat-insulting covering agent forms two layers of slag, the bottom layer covers molten steel to prevent secondary oxidation, reduce carbon content in molten steel and adsorb alumina floating to the surface of molten steel, and the top layer in porous and loose structure covers molten steel to prevent incrusting and carburization.

Description

technical field [0001] The invention relates to an alkaline granule tundish thermal insulation covering agent, in particular to a double-layer alkaline granule tundish thermal insulation covering agent. Background technique [0002] At present, the alkaline molten steel tundish thermal insulation covering agent commonly used at home and abroad must add carbonized rice husk for thermal insulation. However, due to the high carbon content of carbonized rice husks reaching 30-50%, it is easy to cause carbonization of molten steel and cause environmental pollution. Contents of the invention [0003] The purpose of the present invention is to overcome the problem that the alkaline molten steel tundish commonly used in the prior art must be covered with carbonized rice husk for thermal insulation, which may easily cause carbonization of the molten steel and cause environmental pollution. The technical scheme of the present invention designs a double-layer alkaline particle tundis...

Claims

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Application Information

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IPC IPC(8): B22D11/111
Inventor 王兆达江浦琼丁劲光徐永斌
Owner 上海宝谊保温材料有限公司
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