News

News

Follow us to learn about news and information

Application of fused corundum brick in float glass melting furnace

Release time:

2023-12-01 00:00

The glass melting furnace is a thermal equipment for melting glass composed of refractory materials. The service efficiency and service life of glass melting furnace depend on the variety and quality of refractory materials to a great extent. The development of glass production technology depends to a large extent on the improvement of refractory manufacturing technology. Therefore, the rational selection and use of refractory materials is a very important content in the design of glass melting furnaces. To do this, we must master the following two points, one is the characteristics and applicable parts of the selected refractory materials, and the other is the use conditions and erosion mechanism of each part of the glass furnace.

Electro-fused corundum brick is in the electric arc furnace will be molten alumina cast into the specified specific shape of the model, after annealing insulation, and then through processing to get the desired product. The general production process is to use high-purity calcined alumina (above 95%) and a small amount of admixture, mix it into an electric arc furnace, melt it at a high temperature above 2300 ℃, cast it into a prefabricated mold, and then take it out after heat preservation annealing. The taken out blank becomes a finished product that meets the requirements after accurate cold working, pre-assembly and inspection.

Electro-fused corundum bricks are divided into three types according to the different crystal forms and quantity of alumina: the first type is α-Al2 O 3 as the main crystal phase, which is called α-corundum brick; The second type is mainly α-Al2 O 3 and β -Al 2 O 3 crystal phases with roughly the same content, which is called α-β corundum brick. The third type is mainly β -Al 2 O 3 crystal phase, which is called β corundum brick. The second and third kinds of fused corundum bricks are commonly used in float glass melting furnaces, namely, fused α β corundum bricks and β corundum bricks. This paper will focus on the physical and chemical properties of electrofused α β corundum brick and β corundum brick and its application in float glass melting furnace.

Application of fused corundum brick in float glass melting furnace

The glass melting furnace is a thermal equipment for melting glass composed of refractory materials. The service efficiency and service life of glass melting furnace depend on the variety and quality of refractory materials to a great extent. The development of glass production technology depends to a large extent on the improvement of refractory manufacturing technology. Therefore, the rational selection and use of refractory materials is a very important content in the design of glass melting furnaces. To do this, we must master the following two points, one is the characteristics and applicable parts of the selected refractory materials, and the other is the use conditions and erosion mechanism of each part of the glass furnace.

Process Improvement of Electro-fused Zirconium Corundum Pavement Brick

Electrically fused zirconium corundum brick is made of industrial alumina powder and zircon sand (containing 66% of zirconium oxide and 34% of silicon dioxide) melted at high temperature in an electric furnace. After melting, it is cast into a shape (the casting temperature is 1780-1840 ℃), injected into the model and cooled to form a solid close to white. Its petrographic structure consists of the eutectoid body and glass phase of corundum and zirconium clinite, it is a eutectoid body of corundum phase and zirconium clinoptilite phase, and the glass phase is filled between their crystals.

How to overcome the defects produced in the casting and annealing of fused zirconium corundum bricks

Electrofused zircon corundum brick in the production will produce a variety of defects, resulting in the use of poor quality products. The physical and chemical inhomogeneity of zirconium corundum bricks is often the main reason for the defects of the products. Particles that are not melted through in the batch and gas inclusions that have not been discharged from the melt in time are all physical inhomogeneities. The difference in the composition of the melt along the depth of the furnace is a chemical inhomogeneity.

Causes of Serious Erosion of Zirconium Corundum Brick in Glass Electric Melting Furnace

The erosion of fused zirconium corundum brick is mainly divided into physical action and chemical action. Physical action refers to the glass melting furnace wall in the long-term operation process, repeatedly subjected to the impact of rapid cooling and rapid heat, the surface must undergo a contraction of the expansion of the change process. Due to excessive fatigue, the structure of fused zirconium corundum brick is damaged, resulting in increased surface cracks and loose structure. Therefore, under the action of air flow, material and glass liquid washing, cracking and peeling, and this process will be repeated.