MgO-C bricks for EAF



Furnaces, such as the use of direct reduced iron or parts with irregular oxidation and hot spots of electric furnaces, can become an important part of EAF magnesia-carbon bricks by adding various metal antioxidants.

The corrosion behavior of magnesia-carbon bricks used in the slag line is characterized by the formation of an obvious reactive dense layer and a decarburized loose layer. The reaction dense zone also becomes the slag intrusion zone, which is the erosion area where the high temperature liquid slag infiltrates the inside of the brick body after the magnesia-carbon brick is decarburized to form a large number of pores. In this region, FeOn in the slag is reduced to metallic iron, and even the desolubilized phase and intergranular Fe2O3 dissolved in MgO are also reduced to metallic iron. The depth of slag penetration into the brick is mainly determined by the thickness of the decarburized loose layer, which usually ends at the place where the residual graphite is present. Under normal circumstances, the decarburized layer of magnesia-carbon bricks is relatively thin due to the presence of graphite.

There are two ways of tapping in the electric furnace: tilting tapping and bottom tapping. When the tapping groove is used for tilting, the magnesia-carbon brick is basically not used, but Al2O3 or ZrO2 is selected, and non-oxygen substances such as C, SiC and Si3N4 are added. When bottom tapping is used, the tapping hole is composed of outer sleeve bricks and inner tube bricks. The tapping port at the bottom of the furnace adopts magnesia carbon brick tube bricks, and the diameter of the tube bricks is determined according to factors such as furnace capacity and tapping time. Generally, the inner diameter is 140~260mm.

The electric furnace of a steel plant uses medium- and low-block magnesia-carbon bricks in the tap hole brick, and the two sides of the copper tap instead of the original sintered magnesia bricks have initially achieved good results, and the furnace age has been increased from about 60 furnaces to more than doubled. . After use, the magnesia-carbon brick at the slag line remains relatively intact and does not stick to slag. The slag line part does not need to make up the furnace, which not only reduces the labor intensity but also improves the purity and productivity of the molten steel.

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