Thermal gunning material for RH furnace lower portion groove working lining magnesium-aluminum spinel brick

A technology of lining magnesia-aluminum spinel and hot-repairing gunning material, which is applied in the field of hot-repairing gunning material for lining refractory bricks in the lower groove of RH furnace, can solve the problem of long repairing operation time, high rebound rate, and unfavorable low-silicon steel smelting and other problems to achieve the effect of shortening the repair time

Inactive Publication Date: 2015-10-28
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the technical problems of high rebound rate, long repair work time and unfavorable low silicon steel smelting when the existing gunning material is used for thermal repair of magnesium-aluminum-alumina-spinel bricks in the lower groove of RH furnace

Method used

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  • Thermal gunning material for RH furnace lower portion groove working lining magnesium-aluminum spinel brick

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Embodiment Construction

[0020] A thermal spraying material for lining magnesia-aluminum spinel bricks in the lower groove of an RH furnace, the weight percentages of the raw material components are: sintered magnesia 35%-45%, periclase 25%-35%, corundum 13% %~24%, Sodium Nitrate 6%~8%, Al 2 0 3 Micropowder 3% to 4%.

[0021] The preparation method of the product of the invention is as follows: firstly, the magnesia and sintered magnesia are crushed and pulverized; Mix in the machine for 15-20 minutes, and then put it into the finished bag.

[0022] Examples of the present invention are shown in the following table.

[0023] Example table of thermal supplementary gunning material for working lining magnesia-aluminum spinel bricks in the lower groove of RH furnace

[0024]

[0025] After spraying the refractory bricks of the lower groove and the lower groove of the RH furnace with 30 tons of gunning material of the present invention, the rebound rate of the gunning material is only 2%, and no lo...

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Abstract

The invention relates to a thermal gunning material for a RH furnace lower portion groove working lining magnesium-aluminum spinel brick. A purpose of the present invention is to solve the technical problems of high bounce rate, long repair work time and difficult low-silicon smelting during the hot-state repair of the RH furnace lower portion groove working lining magnesium-aluminum spinel brick in the prior art. The thermal gunning material comprises the following raw materials by weight: 35-45% of sintered magnesia, 25-35% of periclase, 13-24% of corundum, 6-8% of sodium nitrate, and 3-4% of Al203 micro-powder. According to the present invention, the thermal gunning material is mainly used for the hot-state repair of the RH furnace lower portion groove working lining magnesium-aluminum spinel brick, wherein the service life of the RH furnace lower portion groove working lining achieves more than 4 times the original service life after the repair, and compared with the bounce rate of the existing gunning material of 20%, the bounce rate of the gunning material of the present invention is reduced to less than or equal to 5% during the thermal repair.

Description

technical field [0001] The invention relates to a thermal supplementary gunning material for working lining refractory bricks in the lower groove of an RH furnace, in particular to a thermal supplementary gunning material for working lining magnesia-aluminum spinel bricks in the lower groove of the RH furnace. Background technique [0002] The RH vacuum degassing refining method is jointly developed by Ruhrstahl and Heraeus, which are affiliated to Tyssen, Germany. The vacuum molten steel circulation degassing method is jointly developed by the two companies. This molten steel refining method is named RH vacuum degassing refining method, which can further reduce [O] and [N] in molten steel, and is used for smelting steel with high cleanliness in molten steel. [0003] The working conditions of the RH furnace insertion tube mainly have three aspects, one is to withstand the erosion and erosion of high-speed flowing air flow and molten steel; the other is the erosion and penet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 孙玉军洪建国王海军唐洪乐
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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