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Continuous casting tundish dry ramming material

A technology for ramming material and continuous casting, which is applied in the field of dry ramming material in continuous casting tundish, can solve the problems of increased consumption, low olivine, poor high temperature resistance and stability, etc., and achieves the effect of improving service life and reducing consumption.

Inactive Publication Date: 2017-01-04
CHANGXING MINGSHENG METALLURGY FURNACE CHARGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, technicians have proposed the solution of using forsterite to replace some high-grade magnesia. However, due to the low content of magnesium oxide in olivine and poor high temperature stability, this leads to the service life of this tundish ramming material. Not long, increased consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] A continuous casting tundish dry-type ramming material, which is composed of the following components in mass percentage: 55% natural forsterite, 17.5% middle-grade sintered magnesia, 7.5% fused magnesia, 12.5% ​​quartz sand, graphene oxide 0.075%, binder 3%, burning accelerator 1.25%, antioxidant 0.45%, anti-penetration agent 0.9%, and the rest is impurities. The binder includes resole phenolic resin and sodium tripolyphosphate, and the mass ratio of the resole phenolic resin to sodium tripolyphosphate is 3:1. The antioxidant includes metal zinc powder and nano-silicon powder, and the mass ratio of the metal zinc powder to nano-silicon powder is 3:1. The anti-penetration agent is carbon powder.

Embodiment 2

[0014] A continuous casting tundish dry-type ramming material, which is composed of the following components in mass percentage: 65% natural forsterite, 10% middle-grade sintered magnesia, 5% fused magnesia, 15% quartz sand, graphene oxide 0.05%, binder 3.5%, burning accelerator 1.5%, antioxidant 0.55%, anti-penetration agent 1.15%, and the rest is impurities. The binder includes resole phenolic resin and sodium tripolyphosphate, and the mass ratio of the resole phenolic resin to sodium tripolyphosphate is 3:1. The antioxidant includes metal zinc powder and nano-silicon powder, and the mass ratio of the metal zinc powder to nano-silicon powder is 3:1. The anti-penetration agent is carbon powder.

Embodiment 3

[0016] A continuous casting tundish dry-type ramming material, which is composed of the following components in mass percentage: 45% natural forsterite, 25% middle-grade sintered magnesia, 10% fused magnesia, 15% quartz sand, graphene oxide 0.05%, binder 3.5%, burning accelerator 1.5%, antioxidant 0.35%, anti-penetration agent 0.65%, and the rest is impurities. The binder includes resole phenolic resin and sodium tripolyphosphate, and the mass ratio of the resole phenolic resin to sodium tripolyphosphate is 3:1. The antioxidant includes metal zinc powder and nano silicon powder, and the mass ratio of the metal zinc powder to nano silicon powder is 3:1. The anti-penetration agent is carbon powder.

[0017] In order to test the technical effect of dry ramming materials, the above three examples were applied to the tundish used in a 120t electric furnace in a steel plant for trial use. The pouring steel type was 20CrMnTi; the tundish temperature was 1550°C, and the pouring time ...

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PUM

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Abstract

The invention relates to a continuous casting tundish dry ramming material which is mainly composed of, by mass, 45-55% of natural forsterite, 10-15% of middle-grade sintered magnesia, 5-10% of fused magnesia, 10-15% of quartz sand, 0.05-0.1% of oxidized graphene, 2.5-3.5% of binder, 1.0-1.5% of burning promoter, 0.35-0.55% of antioxidant and 0.65-1.15% of anti-permeation agent. When in use, the dry ramming material has good molten steel penetration resistance and molten steel erosion resistance and is moderate in sintering layer thickness and good in heat-insulating performance; high-grade magnesia is low in consumption and high in using efficiency; by adding a small amount of oxidized graphene, service life of a tundish can be prolonged remarkably and reaches longer than 60h in 120t steelmaking continuous casting tundish and 150t steelmaking continuous casting tundish experiments; after use, effects of tundish turning and separation and disintegration of a permanent layer are good.

Description

technical field [0001] The invention relates to a novel unshaped refractory material, in particular to a continuous casting tundish dry ramming material. Background technique [0002] In modern continuous casting production, the tundish plays an irreplaceable important role, which can stabilize the temperature of molten steel, make molten steel inclusions float up, and ensure continuous casting. Most of the tundish dry-type ramming materials in domestic large and medium-sized steel mills use various grades of magnesia, but with the increasing depletion of magnesia resources and the rapid rise of magnesia prices, how to improve the utilization rate of magnesia resources and use low-grade magnesia Replacing high-grade magnesia to reduce production costs has become a new research hotspot. [0003] In the prior art, technicians have proposed the solution of using forsterite to replace some high-grade magnesia. However, due to the low content of magnesium oxide in olivine and po...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/04C04B35/634
CPCC04B35/66C04B35/04C04B35/63476C04B2235/3418C04B2235/40C04B2235/422C04B2235/425C04B2235/428C04B2235/447
Inventor 汤卫明李开胜
Owner CHANGXING MINGSHENG METALLURGY FURNACE CHARGE