Which Furnace Linings Will Alumina Bubble Bricks be Used for?

Alumina hollow ball bricks belong to the category of lightweight bricks, and the proportion of use is not very wide at present. Alumina Bubble Brick is an insulating refractory product made of alumina hollow ball as the main raw material. It is mainly used as the lining of high-temperature industrial kilns below 1800℃ and the thermal insulation layer of high-temperature thermal equipment.

Energy-Saving Thermal Insulation Alumina Bubble Bricks

Which Furnace Linings Will Alumina Bubble Bricks be Used for?

The manufacturing method of alumina hollow ball brick. First, the alumina raw material is put into a pouring electric furnace and melted into a liquid state. The furnace is then poured at an angle so that the solution flows out of the pouring trough at a certain rate. Then use a flat nozzle to blow the liquid flow with a high-speed air flow with a pressure of 0.6~0.8MPa to form an alumina hollow sphere. Alumina hollow spheres, sintered alumina fine powder, and binder are batched, shaped, dried, and fired in a certain proportion to obtain alumina hollow sphere bricks.

The aluminum content of the Alumina Bubble Brick is not less than 98%, the content of SiO2 is not more than 0.5%, and the content of Fe2O3 is not more than 0.2%. The bulk density is 1.3~1.4g/cm3, and the apparent porosity is 60~70%. The compressive strength is not less than 9.8MPa, the softening temperature under load (0.2MPa) is not less than 1700℃, and the thermal conductivity is 0.7~0.8W/(m.k).

Which Furnace Linings Will Alumina Bubble Bricks be Used for?

Which furnace linings will Alumina Bubble Bricks be used for? Now the proportion of refractory materials using heavy refractory bricks will be larger. However, in order to optimize the structure of some furnace types, it is necessary to reduce the weight of the furnace body. The bulk density of high temperature-resistant heavy refractory bricks is above 2.6g/cm, and the bulk density of alumina hollow ball bricks is only 1.1~1.5g/cm. Under the condition of the same cubic meter volume, the use of hollow ball bricks can reduce the weight of the kiln body by 1-2 tons.

From the perspective of cost, the price of heavy bricks and hollow ball bricks is similar, and the price of Alumina Bubble Bricks for special areas may be slightly higher than that of heavy bricks. However, in terms of weight, the use of hollow ball bricks can reduce 1-2 tons per cubic meter. Moreover, there is no need to make an insulating layer, which reduces the amount of use and saves fuel. Not only the use effect is good, but the cost is also reduced a lot.

Due to the good thermal insulation performance of the alumina hollow ball, the heat dissipation is reduced, the thermal efficiency is improved, and the energy-saving effect is up to 30%. Therefore, the high-temperature zone lined with some high-temperature kilns or the lining of shuttle kilns is all made of hollow ball bricks, which have a significant effect on lightweight use.

Alumina Bubble Bricks have high aluminum content, low iron content, and low bulk density. They are used as working layers in high-temperature areas of shuttle kilns and tunnel kilns, and can also be used as insulation layers in high-temperature areas. Which furnace linings will Alumina Bubble Bricks be used for? Alumina Bubble Bricks can be used for high-temperature energy saving (>30%) down-flame kiln, shuttle kiln, molybdenum wire furnace, tungsten rod furnace, induction furnace, nitriding furnace, etc. By reducing the weight of the furnace body, transforming the structure, saving materials, and saving energy, obvious effects will be achieved.

What is about the Working Environment for Silicon Carbide Refractory Castables?

Silicon carbide castable is a composite refractory castable, and a certain proportion of silicon carbide, alumina powder, corundum, or high-content bauxite raw materials are added to the internal matrix. The binder is composed of pure calcium aluminate cement and some other chemical components. What atmosphere and temperature are silicon carbide refractory castables suitable for? What is the suitable working lining environment for silicon carbide refractory castables? Rongsheng Refractory Materials for Sale will provide you with the most suitable silicon carbide castable products according to the specific working environment of your refractory lining.

What is the Working Environment for Silicon Carbide Refractory Castables

Silicon carbide castables are suitable for use in furnace linings in a reducing atmosphere, and the effect is better when used at temperatures above 1500 °C. The service temperature of silicon carbide in the reducing atmosphere can reach as high as 2454 ℃.

If used in an oxidizing atmosphere, an oxidation reaction is likely to occur. If used in an oxidizing atmosphere, silicon carbide cannot produce a protective film on the surface. If the oxidation pressure is high, the surface layer will crack or peel due to temperature change and mechanical shock. If the oxygen partial pressure is low, the protective layer cannot be formed, but it will diffuse in the pores, resulting in a decrease in the quality of the silicon carbide castable.

Silicon carbide refractory castable is suitable for working lining environment. Castable manufacturers add a certain proportion of binder to the composite process ratio to adjust the oxidation reaction. Generally, metal silicon is used to adjust to inhibit the oxidation reaction. Sodium salt solution or sol can also be used to penetrate into the open pores of the material, which can inhibit oxidation and improve the service life.

Therefore, silicon carbide refractory castable is suitable for working lining environment. Silicon carbide castables are not suitable for use at low temperatures, especially in oxidizing atmospheres. Used in a reducing atmosphere, the higher the temperature, the better the use effect.

Silicon carbide castables are mostly used in boiler linings or linings for iron trenches in front of blast furnaces, and high wear-resistant castables are used in boiler linings. Silicon carbide refractory castable is suitable for working lining environment. It is also useful in the blanking part of the rotary kiln. The effect is also very good. The anti-skin castable is used in this part.

Because of the high temperature and harsh use conditions, the wear resistance of silicon carbide castables is particularly good. As long as it is used in the right place, the service life will be increased by more than 50% compared with the service life of ordinary low-cement castables.

 

Low Cement Wear-Resistant Castable

What are low cement sic castables?

Low-cement SiC refractory castables are characterized by low linear expansion coefficient, high thermal conductivity, high strength, and good wear resistance. It is widely used in thermal equipment such as power generation boilers, non-ferrous metallurgical furnaces, and incinerators, and the use effect is good.

What is low cement sic castable? Low-cement sic castables refer to refractory castables with sic greater than 97% silicon carbide as refractory aggregate and powder. Add sio2 ultrafine powder and metal silicon antioxidant. Use ca-70 cement as a binder and add a polyphosphate water reducer.

The main physical and chemical properties of low cement sic refractory castables are that the sic is 85%. 110 ℃ drying bulk density. The compressive and flexural strengths are 25g/cm, 45Mpa, and 9Mpa respectively. The line change, heat resistance, and flexural strength after burning at 1100℃ are -0.2%, 107Mpa, and 24Mpa, respectively. The line changes after burning at 1450℃, and the pressure resistance and bending strength are +0.3%, 130Mpa, and 54Mpa respectively. The thermal conductivity at 400°C is 12.2W (M.K).

As a refractory castable manufacturer with an advanced amorphous refractory production line, Rongsheng Refractory Manufacturer can provide high-quality silicon carbide low-cement wear-resistant castables and anti-skin castables for boiler linings, rotary kiln linings. Know what is the suitable working lining environment for silicon carbide refractory castables? To buy silicon carbide low cement castables, please search and find our website: http://www.aluminabricks.com/. And leave your requirements for refractory materials on our website page. We will get in touch with you as soon as possible.