Demystifying the classification and production process of high quality electric melting bricks

The fused brick is formed by using pure alumina powder (Al2O3) and zircon sand containing about 5% of zirconium oxide (ZrO2) and about 34% of silicon dioxide (SiO2) in the electric furnace and then injected into the mold to form cooling. The white solid structure, whose lithofacies structure consists of eutectoids and glass phases of corundum and zircon slanting stones, which are phased as eutectoids of corundum phase and zircon slant phase, and the glass phase is filled with their crystals. between.

 

In the field of refractory materials, fused bricks are roughly divided into the following three categories. Next, Tianyang refractory materials will introduce their production processes separately.

 

Alumina hollow ball thermal insulation brick manufacturing method: firstly, the alumina raw material is added into a dumping electric furnace to be melted into a liquid state, and then the furnace is tilted at a certain angle, so that the molten metal flows out from the pouring trough at a certain speed, and the liquid flows through the flow and the flow. The flat nozzle of 60°~90 blows the liquid stream at a high-speed airflow with a pressure of 0.6~0.8MPa, which is formed into an alumina hollow sphere, and then the alumina hollow sphere, the sintered alumina fine powder and the binder are proportioned Ingredient, molding, drying, firing, the alumina hollow sphere brick alumina hollow sphere brick has an Al2O3 content of not less than 98%, SIO2 content is not more than 0.5%, Fe2O3 content is not more than 0.2%, and the product density is 1.3~1.4g/cm3. The apparent porosity is 60%-70, the compressive strength is not less than 9.8 MPa, the load (0.2 MPa) softening temperature is not less than 1700 °C, and the thermal conductivity is 0.7-0.8 W/(M·K).

The manufacturing method of the zirconia hollow ball brick is a zirconia hollow ball brick product prepared by electroforming a zirconia hollow sphere, adding a binder to the zirconia hollow sphere, and forming and firing. The zirconia hollow ball brick has high purity (ZrO2+ stabilizer content & ge; 99%), high temperature resistance (use temperature can reach 2200 ° C), good thermal insulation performance and excellent chemical stability, and is mainly used for medium frequency induction furnace of cemented carbide. The lining or heat insulation lining of the fused silica furnace lining and the ultra-high temperature equipment with the operating temperature above 2000 °C.

 

Alumina thermal insulation brick, called light corundum brick. The manufacturing method is as follows: usually, industrial alumina is used as a raw material, a small amount of soft clay and a binder are added, and the slurry is ground together, and is formed by a foaming method or a gas generating method, cast molding, drying, firing at 1400 to 1550 ° C, and then passing through Cut, cut, drill, and grind into refractory brick products of the desired shape. The insulated refractory brick section is a relatively uniform circular hole structure and is therefore often referred to as foamed alumina or corundum) lightweight refractory bricks.

 

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