In the process of firing landscape bricks, not only must high-quality raw materials be used, but the correct firing method should be selected. It is more important to adhere to the outstanding and stable surrounding environment, because the environment has a greater impact on landscape bricks. The fired landscape brick may be invalidated due to some external shaking. Let ’s take a look at what factors affect the simple process of landscape brick firing.
1.The effect of drastic temperature change
Many furnaces, especially batch-operated furnaces, have large temperature fluctuations, and sudden changes in temperature produce large internal stresses that cause the brickwork to crack, fall, and deform or collapse when severe. For example, the steelmaking converter, electric arc furnace and copper-tin smelting reverberatory furnace, the maximum furnace temperature during the melting period can reach 1250 ~ 1650 ℃, and after slag discharge, steelmaking, copper extraction, the furnace temperature drops sharply to 600 ～ 800 ℃, the temperature in a short time The internal shaking is too fast and too large, and the stress in the formation of the scene brick is large, and it will crack and fall off and be damaged.
2.Vapor deposition effect
In many smelting furnaces and flame furnaces, CO differentiation and evaporation of lead, zinc, and alkali metal oxides occur during the production process, and they are deposited in the porosity and masonry of landscape bricks, forming cracks, deformation and chemical corrosion of brickwork. This phenomenon is more prominent in the upper part of the blast furnace, blast furnace, shaft kiln and coke oven, and even becomes the main cause of damage to these parts.
3.Slag erosion effect
Corrosion caused by physical and chemical effects of slag and molten metal or dusty corrosive gas. According to statistics, 60% to 70% of the linings of nonferrous metallurgical furnaces are damaged due to the corrosion of slag; the slag line area of steelmaking converters and electric furnaces is the most severely damaged part due to slag corrosion, and the lining is decided Life.