Improved type slag splashing furnace protecting material and preparation method thereof

Abstract

The invention provides modified slag splashing maintenance material which can be used in multiple furnaces and a preparation method thereof. The invention is characterized in that the maintenance material comprises waste magnesium carbon bricks, complex deoxidizer (metal magnesium powder, metal aluminum powder and ferrosilicon alloy), raw materials containing TiO2, etc. The mass percentage is: 30 percent to 75 percent of MgO, 3 percent to 20 percent of total C, 2 percent to 10 percent of Al2O3, 1 percent to 10 percent of TiO2, 0.3 percent to 5 percent of Mg, 1 percent to 12 percent of Al, and the residue is SiO2. The complex deoxidizer amount obviously improves the reduction of the furnace temperature on FeO and improves the yield rate of the converter steelmaking. Specifically, nitrogen that is blown in when TiO2 and splashing slag are introduced helps to form the nitrogen titanium compound with high melting point, which improves the viscosity of the slag, enhances the adhesion force of the splashing slag material to MgO-C bricks of lining bricks of the converter and improves the maintenance effect. And the bonding strength of the splashing slag layer with the converter lining bricks is improved because of the join of TiO2. The obvious effect of the splashing slag maintenance technology is obtained that one time of the slag splashing can support 3 to 5 converters rather than just one before.

Description

technical field

[0001] The invention relates to an improved slag-splashing furnace charge and its preparation method, in particular to a compound deoxidizer and TiO-containing 2 A slag-splashing furnace protection material prepared from raw materials that can be used repeatedly and a preparation method thereof belongs to the field of steel-making slag-splashing furnace protection technology and refractory materials. Background technique

[0002] Furnace protection by slag splashing is an effective furnace protection technology for converters. Slag splashing is to leave part of the final slag after the converter is tapped, and adjust the viscosity and magnesium oxide content of the slag to an appropriate range by adding protection materials. Inject high-velocity nitrogen to spray the slag onto the furnace lining for cooling. Solidified to form a solid slag layer, as a consumable refractory layer, the slag layer reduces the mechanical erosion and physical and chemical erosion...