What are the selection methods for high alumina refractory bricks?

Refractory bricks are divided into heavy and lightweight, with lightweight having a specific gravity and material. Heavy substances are divided into alkaline, acidic, and neutral.

So, how to choose a suitable kiln lining with high alumina refractory bricks?

Materials must be considered first, and the selection of materials depends on temperature, degree of corrosion, and the properties of the furnace. Then look at lightweight and heavyweight. If the weight is light, it also depends on the temperature. Then choose lightweight clay bricks or lightweight high alumina bricks. If the temperature is greater than 1300 ℃, choose Morley. If stone aggregate lightweight bricks or high alumina aggregate lightweight bricks come into direct contact with flames, corundum mullite aggregate lightweight bricks or alumina hollow ball bricks should be selected.

If it is the working layer, it is necessary to consider heavy refractory bricks, or first check the temperature. If the temperature is 1000 °C and does not exceed 1100 °C, clay bricks should be used. If it is greater than 1200 ℃, high aluminum bricks should be used. Of course, the temperature is 1300 °C- Choose first grade high alumina bricks at 1350 ℃, second grade high alumina bricks at 1200 ℃, or third grade high alumina bricks. Corundum refractory bricks must be used for temperatures above 1500 °C.

In addition, considering whether the kiln lining is in an acidic or alkaline atmosphere, silica bricks should be selected for sour gas fields. If the glass kiln is a series of zirconium cast refractory bricks. If it is an alkaline atmosphere, alkaline refractory bricks, namely the magnesium refractory brick series, should be selected.

It is also necessary to consider the size of the designed refractory bricks. To meet the requirements of furnace construction, it is also necessary to consider the convenience of refractory brick production, as refractory bricks can be pressed and formed during the forming process, and the size of refractory bricks is too long to be pressed and formed. The strength of manually formed refractory bricks is lower than that of pressed refractory bricks, and low strength will inevitably affect the service life of refractory bricks. Therefore, the selection of refractory bricks should not only consider the convenience of furnace operation, but also consider the convenience of refractory brick manufacturers' manufacturing. Of course, it is easy to use national standard models in design.

For example, the upper part of the blast furnace is built with clay bricks; The middle part is built with magnesium bricks, magnesium chromium bricks, or magnesium chromium bricks; Choose fine and dense clay bricks, high alumina bricks, or magnesium chromium bricks. The furnace is built with magnesium bricks and magnesium chromium bricks.

The lead-zinc enclosed blast furnace is a new type of furnace for processing lead-zinc oxide ore or lead-zinc ore. It directly produces lead and zinc. The furnace and waist are made of magnesium chromium bricks, and the furnace top and the connection with the lead mist chamber are densely used. The masonry is made of clay bricks, and the side walls are made of clay combined with silicon carbide bricks. The bottom and top of the lead-zinc separation chamber are constructed with dense clay bricks. The bottom of the drainage channel and the outlet channel are constructed with secondary high alumina refractory bricks, and the channel wall is constructed with magnesium chromium bricks or chromium bricks.