Gunning mix for repairing RH refractory brick

Abstract

The invention relates to gunning mix for repairing refractory materials, in particular to gunning mix for repairing an RH refractory brick. In order to solve the technical problem of short service life of the RH refractory brick due to falling off in the prior art, the invention creatively discloses the gunning mix for repairing the RH refractory brick, the gunning mix comprises the following raw materials by weight: 35 to 45 % of periclase, 25 to 35 % of magnesite clinker, 13 to 24 % of pure calcium aluminate cement, 6 to 8 % of monox ultrafine powder and 3 to 4 % of aluminium oxide micro powder. The gunning mix disclosed by the invention has the advantages that after the repair of a magnesia-alumina spinel brick of the RH stove, the maintenance period is reduced from the original about 5 times per month to about 2 times per month caused by the cracking or the falling off of the magnesia-alumina spinel brick, and the maintenance cost is reduced; the average service life of the magnesia-alumina spinel brick is prolonged from the original 65 stove times on average to 98 stove times on average after the repairing of the magnesia-alumina spinel brick by the conventional spray-repairing method.

Description

technical field [0001] The invention relates to a gunning material for repairing refractory materials, in particular to a gunning material for repairing RH refractory bricks. [0002] Background technique [0003] The RH vacuum degassing refining method was jointly developed by Ruhrstahl and Heraeus, a subsidiary of Tyssen in Germany, and the vacuum molten steel circulation degassing method was successfully developed. The two companies used their company names This molten steel refining method is named RH vacuum degassing refining method. This method can further reduce [O] and [N] in molten steel, and is used for smelting steel with high cleanliness in molten steel composition. [0004] There are three main working conditions for the RH furnace insertion tube, one is to withstand the erosion and erosion of high-speed flow of air flow and molten steel; the other is the erosion and penetration of molten slag; the third is thermal spalling and structural spalling caused by int...

AI Technical Summary

Problems solved by technology

[0008] Aiming at the technical problem that the current RH refractory bricks fall off and cause low service life, the present invention creatively discloses a gunning material for repairing RH refractory bricks. The weight percentage of the raw material components is 35% to 45% of periclase, 25% to 35% of sintered magnesia, 13% to 24% of pure calcium aluminate cement, 6% to 8% of silicon oxide superfine powder, Aluminum powder 3% ~ 4%