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What are the selection methods of refractory bricks?

Release time：2024-01-24

Refractory bricks are divided into heavy and light weight, and light weight is divided into specific gravity and material. Heavy have alkaline, acidic, neutral points.

So, how to choose the right refractory brick kiln lining?

The first thing to consider is the material, and the choice of material depends on the temperature, erosion degree and nature of the furnace. Then look at the light and heavy ones. If it is light, it depends on the temperature and then choose light clay brick or light high alumina brick. If the temperature is greater than 1300 ℃, it is necessary to choose mullite light brick or high alumina light brick. If it is in direct contact with flame, it is necessary to choose corundum mullite light brick or alumina hollow ball brick.

If it is a working layer, heavy refractory bricks should be considered or the temperature should be considered first. If the temperature is 1000 ℃ and not more than 1100 ℃, clay bricks should be selected. If the temperature is more than 1200 ℃, high alumina bricks should be selected. Of course, if the temperature is 1300-1350 ℃, first-class high alumina bricks should be selected, second-class high alumina bricks or third-class high alumina bricks should be selected at 1200 ℃. Above 1500 ℃, corundum refractory bricks must be used.

In addition, it is necessary to consider whether the kiln lining is an acidic atmosphere or an alkaline atmosphere, and the acidic gas field must choose silica bricks. If the glass kiln pool, that is zirconium pouring refractory brick series. If it is alkaline atmosphere to choose alkaline refractory brick, that is, magnesium refractory brick series.

Also to be considered is the design of refractory brick brick size, to meet the furnace building operation must also consider the production of refractory brick is convenient, because refractory brick in the molding process can be machine press molding, refractory brick size is too long, can not machine press molding, manual molding refractory brick strength is lower than the machine press molding refractory brick, low strength is bound to affect the service life of refractory brick. Therefore, the choice of refractory bricks should be considered to facilitate the operation of the furnace, but also to facilitate the manufacture of refractory brick manufacturers. Of course, the design is best to use the country in the standard model.

For example, the body of the blast furnace is built with clay bricks. The middle part is built with magnesia brick, magnesia chrome brick or magnesia chrome brick. The temperature of the lower part of the furnace body and the tuyere area is 1300 ℃, and the temperature of a single part is 1500 ℃. Fine clay brick, high alumina brick or magnesia chrome brick are selected for strict application conditions. Furnace with magnesium brick, magnesium chrome brick masonry.

The lead-zinc closed blast furnace is a new furnace type for processing lead-zinc oxide ore or lead-zinc. It produces lead and zinc by direct exercise. The furnace cylinder and furnace waist are built with magnesium-chromium bricks, the furnace roof and the joint with the lead fog chamber are built with dense clay bricks, and the side wall is built with clay combined with silicon carbide bricks. The bottom and top of the lead-zinc separation chamber are built with dense clay bricks. The bottom of the lead liquid chute and the lead outlet chute shall be built with secondary high aluminum refractory bricks, and the wall of the chute shall be built with magnesia chrome bricks or chrome bricks.

In short, the selection of refractory bricks is based on different furnace types, different temperatures, and different degrees of erosion.

keyword： What are the selection methods of refractory bricks?