Analysis of Causes of Damage to Refractory Bricks

During the use of refractory bricks, they will be damaged due to physical factors, chemical factors, mechanical factors, and other factors. We will analyze them in detail one by one.

Physical factors: During use, the refractory bricks crack due to rapid changes in temperature. Excessive temperature causes high-temperature melting. The refractory bricks shrink or expand after re-burning, causing damage to the furnace body and shortening the service life of the refractory bricks.

The oven is improperly dried, the temperature rises too quickly, and the refractory bricks expand thermally too much. The furnace body is damaged and the service life of the refractory bricks is shortened.

Chemical factors: chemical attack of slag (including chemical attack of ash). In general, the corrosion of the lining of the refractory materials in the smelting furnace is mainly caused by the chemical corrosion of the furnace gas.

Mainly refers to the gradual oxidation and erosion of carbon refractory materials in high-temperature oxidation furnace gas, and chemical erosion occurs between refractory materials.

When acidic and alkaline refractories are mixed together, fusible compounds form at the point of contact at high temperatures, causing both to erode simultaneously. The principle of electrochemical corrosion of carbon refractory bricks is the same.

In high-temperature smelting furnaces (such as oxygen steelmaking converters), when carbon refractory bricks (such as tar-bonded bricks) are mixed with other refractory bricks, it is possible to generate electrical energy.

The slag is equivalent to the electrolyte, and the carbon-containing refractory bricks become the anode and are destroyed by carbon oxidation.

Mechanical factors: especially the mechanical impact on the furnace bottom and furnace walls when adding metal materials, are important reasons for the fracture of refractory bricks. The extrusion pressure on the high-temperature furnace vault is too high, causing the inner wall of the refractory bricks to soften and deform.