Erosion-resistant ladle slag line magnesia carbon brick

Abstract

The utility model discloses a corrosion-resistant ladle slag line magnesia carbon brick which comprises a magnesia carbon brick main body (1) with an arc-shaped structure, and an anti-oxidation coating (2) is sprayed on a steel facing surface of the magnesia carbon brick main body (1); the magnesia carbon brick main body (1) comprises two magnesia carbon brick layers (101) which are distributed inside and outside, and a latticed boron nitride ceramic layer (102) is arranged between the two magnesia carbon brick layers (101). The utility model has the characteristic that the erosion resistance can be effectively improved.

Description

Technical Field

[0001] The utility model relates to a magnesia carbon brick, in particular to a corrosion-resistant ladle slag line magnesia carbon brick. Background Art

[0002] Currently, the ladle slag line is primarily made of magnesia carbon bricks. Due to the slow turnover of refined ladles during use, spare ladles require extended baking times, sometimes approaching 60 hours. This prolonged high-temperature baking inevitably leads to oxidation of the slag line magnesia carbon bricks, resulting in an oxide layer thickness of 20-30mm. Due to the loose structure of the oxide layer and its poor resistance to erosion by molten steel, the oxide layer is easily washed away by the molten steel. Furthermore, the slag line bricks are prone to fractures and sometimes fall off, severely reducing the service life of the slag line magnesia carbon bricks. Consequently, existing technologies suffer from poor corrosion resistance. Utility Model Content

[0003] The purpose of the utility model is to provide a corrosion-resistant ladle slag line magnesia carbon brick. The utility model has the characteristic of effectively improving the corrosion resistance.

[0004] The technical solution of the utility model is as follows: the corrosion-resistant ladle slag line magnesia carbon brick comprises an arc-shaped magnesia carbon brick body, the steel-facing surface of the magnesia carbon brick body is sprayed with an anti-oxidation coating; the magnesia carbon brick body comprises two inner and outer magnesia carbon brick layers, and a grid-shaped boron nitride ceramic layer is provided between the two magnesia carbon brick layers.

[0005] In the aforementioned corrosion-resistant ladle slag line magnesia-carbon bricks, the upper and lower ends of the boron nitride ceramic layer are further provided with arc-shaped end plates, and multiple layers of grid-shaped connecting plates distributed up and down are further provided between the two arc-shaped end plates.

[0006] In the aforementioned corrosion-resistant ladle slag line magnesia carbon bricks, the front and rear sides of the upper surface of the arc-shaped end plate at the upper end are respectively provided with protruding clamping blocks, and the front and rear sides of the lower surface of the arc-shaped end plate at the lower end are provided with matching arc-shaped clamping grooves.

[0007] Compared with the existing technology, the present invention sprays an anti-oxidation coating on the steel-facing surface of the magnesia-carbon brick body. After baking, the slag line magnesia-carbon bricks coated with the anti-oxidation coating have an oxidation thickness of only 2-4 mm, approximately 10% of the original thickness, effectively improving corrosion resistance. Furthermore, the magnesia-carbon brick body of the present application comprises two layers of magnesia-carbon bricks, one inside the other, and a grid-like boron nitride ceramic layer. This enhances the structural strength of the magnesia-carbon bricks and effectively prevents brick fragments from breaking and falling due to fracture of the magnesia-carbon brick body. In summary, the present invention effectively improves corrosion resistance.

[0008] In addition, the present invention further improves structural strength and prevents brick dropout by providing curved end plates at the upper and lower ends of the boron nitride ceramic to support the wrapped magnesia carbon brick layer. The present invention also provides a raised snap-fit ​​block on the upper surface of the curved end plate and a matching curved snap-fit ​​groove on the lower surface of the curved end face, thereby facilitating installation while improving installation precision and connection stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a structural diagram of the present utility model.

[0010] The markings in the accompanying drawings are: 1-magnesia carbon brick body, 2-anti-oxidation coating, 101-magnesia carbon brick layer, 102-boron nitride ceramic layer, 103-arc end plate, 104-grid-shaped connecting plate, 105-protruding clamping block, 106-arc-shaped clamping groove. DETAILED DESCRIPTION

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0012] Example. Corrosion-resistant ladle slag line magnesia carbon bricks, composed of Figure 1 As shown, it includes an arc-shaped magnesia carbon brick body 1, and the steel-facing surface of the magnesia carbon brick body 1 is sprayed with an anti-oxidation coating 2; the magnesia carbon brick body 1 includes two layers of magnesia carbon brick layers 101 distributed inside and outside, and a grid-shaped boron nitride ceramic layer 102 is provided between the two magnesia carbon brick layers 101.

[0013] The boron nitride ceramic layer 102 is provided with arc-shaped end plates 103 at the upper and lower ends, and multiple layers of grid-shaped connecting plates 104 distributed vertically are provided between the two arc-shaped end plates 103 .

[0014] The front and rear sides of the upper surface of the arc-shaped end plate 103 at the upper end are respectively provided with protruding clamping blocks 105 , and the front and rear sides of the lower surface of the arc-shaped end plate 103 at the lower end are provided with matching arc-shaped clamping grooves 106 .

[0015] The grid-shaped connecting plate and the arc-shaped end plate are both made of boron nitride ceramic and are integrally formed with the boron nitride ceramic layer. The width of the grid-shaped connecting plate is smaller than that of the arc-shaped end plate.

[0016] The upper and lower adjacent grid-shaped connecting plates are staggered in front and back distribution, and the front refers to the side close to the facing steel surface.

[0017] Through the mutual cooperation between the grid-shaped connecting plate and the grid-shaped boron nitride ceramic layer, the main structural strength of the magnesia carbon brick is strengthened from multiple directions to prevent the occurrence of block falling and other phenomena.

[0018] The materials of the magnesia carbon brick layer include low-silicon, high-calcium fused magnesia w(Sio2)=0.45%, w(CaO)=1.32%, w(MgO)=97.70%, and a bulk density of 3.50g; flake graphite with a particle size of ≤0.15mm (100 mesh) and w(C)=96.7%; the antioxidants are industrial-grade aluminum powder and boron compounds, both with a particle size of ≤0.074mm (200 mesh); the binder is liquid phenolic resin, with w(residual C)>46% and a viscosity (25°C) of 17-20pa.

[0019] The oxidation thickness of the slag line magnesia carbon bricks sprayed with anti-oxidation coating is only 2-4mm after baking, which is only about 10% of the original thickness, thereby effectively improving the corrosion resistance.

[0020] During installation, you only need to plug the upper and lower adjacent magnesia carbon bricks together. The arc-shaped snap-in groove at the bottom of the upper magnesia carbon brick is snapped into the raised snap-in block on the upper surface of the lower magnesia carbon brick to achieve the splicing of the upper and lower magnesia carbon bricks. The double-layer snap-in form can provide structural stability on the one hand, and also play a multi-layer sealing role on the other hand.

[0021] Preferably, connecting protrusions with trapezoidal cross-sections are provided between the raised clamping blocks, and corresponding limiting grooves are provided between the arc-shaped clamping grooves. The two cooperate with each other to achieve the purpose of limiting and preventing the magnesia-carbon bricks from being dislocated.

Claims

1. Corrosion-resistant ladle slag line magnesia carbon bricks, characterized by: The invention comprises an arc-shaped magnesia carbon brick main body (1), wherein the steel-facing surface of the magnesia carbon brick main body (1) is sprayed with an anti-oxidation coating (2); the magnesia carbon brick main body (1) comprises two magnesia carbon brick layers (101) distributed inside and outside, and a grid-shaped boron nitride ceramic layer (102) is provided between the two magnesia carbon brick layers (101).

2. The corrosion-resistant ladle slag line magnesia-carbon brick according to claim 1, characterized in that: The boron nitride ceramic layer (102) is further provided with arc-shaped end plates (103) at the upper and lower ends, and multiple layers of grid-shaped connecting plates (104) distributed up and down are further provided between the two arc-shaped end plates (103).

3. The corrosion-resistant ladle slag line magnesia carbon brick according to claim 1, characterized in that: The front and rear sides of the upper surface of the arc-shaped end plate (103) at the upper end are respectively provided with protruding clamping blocks (105), and the front and rear sides of the lower surface of the arc-shaped end plate (103) at the lower end are provided with matching arc-shaped clamping grooves (106).

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