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Carbon-Free And Unburned Corundum Spinel Bricks

Carbon-free and unburned corundum spinel bricks meet the smelting needs of low-carbon steel. Compared with alumina magnesium carbon bricks, they offer improved permeability resistance, corrosion resistance, and peel resistance. Carbon-free and unburned corundum spinel brick also help purify molten steel and have been applied in 150 ton steel ladles, achieving a service life of over 130 heats.

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Description

The Characteristics of carbon-free corundum spinel bricks

1. The specification of carbon-free and unburned corundum spinel bricks

Item	Unit	Value
Al2O3	%	91-93
MgO	%	4-6
Fe2O3	%	≤0.5
Porosity	%	200℃≤11 1500℃≤15
Cold crushing strength	MPa	60-90
Density	g/cm³	3.10-3.25
Anti peeling property	Times	≥15
Thermal expansivity	1500℃x3h,%	≤0.8
Refractoriness under load	℃	≥1700

2. Product Description

What is carbon-free and unburned corundum spinel brick

Carbon-free and unburned corundum spinel bricks are made of fused alumina, plate-like alumina, and fused alumina magnesia spinel sand.

Using α - Al2O3 powder as the main raw material and Alcoa sol as the binder, a 1000 ton molding machine was used to shape and bake at 200 ℃ to produce carbon free and unburned corundum spinel bricks.

Carbon free and unburned corundum spinel bricks are mainly used in the bottom and walls of steel ladles, replacing aluminum magnesium carbon bricks and corundum spinel castables, effectively improving their resistance to permeability, erosion, and peeling.

Carbon free and non burning corundum spinel bricks do not contain carbon, and are non-toxic and smoke-free during the baking process, making them environmentally friendly products.

After heat treatment at 1000 ℃, carbon free and unburned corundum spinel bricks exhibit slight expansion and high strength, indicating that MgO begins to react with Al2O3 to form spinel at 1000 ℃, increasing the bonding strength of the matrix and facilitating resistance to thermal stress induced thermal peeling.

After heat treatment at 1600 ℃, the apparent porosity is low, indicating the formation of a dense and uniform structure in the brick, which is beneficial for improving the anti permeability performance of the product and reducing structural peeling.

2. Product Features

Performance of corundum spinel bricks for steel ladles

1) Carbon free, smoke-free and non-toxic during the baking process, environmentally friendly product.

2) Low apparent porosity, 200 ℃≤ 111500 ℃≤ 15

3) High density, 200 ℃ ≥ 3.3g/cm ³, 1600 ℃ ≥ 3.2g/cm ³

4) High strength, 1000 ℃ ≥ 50MPa, 1600 ℃ ≥ 55MPa

5) Good resistance to penetration, strong resistance to erosion, and good resistance to thermal peeling.

3. Purpose

Carbon free and unburned corundum spinel bricks are mainly used for the bottom and walls of steel ladles, achieving over 130 furnace cycles.

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