Alkali-resistant castables are suitable for the repair and masonry of various industrial furnaces and kilns that need to resist alkaline media and high operating temperatures.
Alkali-resistant castable is a kind of alkali-resistant castable made of aluminum silicate material as refractory aggregate and powder with aluminate cement and additives. Alkaline refractory castable is mainly used for resisting high temperature alkali erosion, it is a kind of unshaped refractory material.
Alkali-resistant castables are mainly used in large and medium-sized dry-process cement kiln nozzles and kiln mouths, preheaters and pipelines and other systems, as well as in the alkali recovery furnace and other equipment in the paper industry.
The preparation process of alkali-resistant castables is complicated and requires several steps.
First, the refractory aggregate and powder need to be dried to remove the moisture;
Then, the dried aggregate and powder are mixed with the binding agent and other materials;
Finally, the mixed materials are cast and maintained to obtain the final alkali resistant castables.
In the production process of alkali-resistant castables, the selection of suitable refractory aggregates and powders is the key. Commonly used refractory aggregates include electrofused corundum, zirconium corundum, magnesium sand, magnesium-aluminum spinel, chromite and zircon, which have excellent high temperature performance and alkali erosion resistance. The choice of binding agent is also very important, and commonly used binding agents include aluminate cement and admixtures.
Alkali-resistant castables can be used at high temperatures, and their ultimate use temperature is usually above 1200℃.
Alkali-resistant castables can resist the erosion of alkali substances, so they are suitable for equipment used in alkaline environments.
Alkali-resistant castables have good anti-abrasion performance and can resist the scouring of high-speed airflow and the friction of furnace charge.
Alkali-resistant castables have good thermal stability and are not easy to be deformed and cracked under high temperature.
Alkali-resistant castables do not produce harmful substances in the process of using, which is harmless to the environment and human body.
The raw materials and fuels for cement production contain high alkali metal oxides, which will cause serious corrosion and abrasion to the inner wall of the kiln and the pipelines and other equipments. Alkali-resistant castables are ideal for cement rotary kiln bodies and kiln decomposition cyclone linings, and roasted alumina rotary kiln linings.
Alkali-resistant castables can also be used in large and medium-sized dry-process cement kilns for coal injection nozzles and kiln mouths, preheaters and pipes.
Alkali-resistant castables are widely used for repairing and forming refractory linings in various alkaline industrial kilns. These kilns include alkaline converters, alkaline electric furnaces, alkaline kilns and so on. Alkali-resistant castables are able to resist the erosion and corrosion of alkaline substances at high temperatures, protecting the structural integrity and service life of the kiln.
Alkali-resistant castables have important applications in the alkaline chemical industry. It can be used for refractory lining repair and formation of equipment such as slurry tanks, storage tanks and reactors. In these equipments, which often come into contact with alkaline solutions, alkaline vapors and other corrosive alkaline media, alkali-resistant castables can provide excellent alkali resistance to ensure the safe and stable operation of the equipments.
Alkali-resistant castables are also widely used in the chlor-alkali industry. Chlor-alkali electrolyzer, alumina kiln and other equipments are often in high temperature and alkaline environment, alkali castables can provide excellent alkali resistance and prolong the service life of the equipments.
Some fine chemical industry production, such as glass fiber production equipment, petrochemical plants, chemical reactors, etc., also need to use alkali-resistant castables for refractory lining repair and formation. Alkali-resistant castables are able to withstand high temperatures and alkaline media, protecting the structural integrity and stability of the equipment.
In the mining and metallurgy industry, some smelting furnaces and kilns, slag processing equipment, etc., may face the erosion of alkaline medium and high temperature environment. Alkali-resistant castables can be used to repair and form refractory linings for these equipment, providing protection and extending service life.
Glass kiln breast wall, pool wall, melting section and other parts, can resist high temperature and alkali erosion, improve the quality and production of glass.
Furnace lining materials for iron and steel smelting kilns are resistant to high-temperature oxidation and alkali erosion, improving the quality and yield of iron and steel.
|Item||Alkali Resistant Castable|
|Chemical Composition, %||Al2O3||45||48|
|Bulk Density, g/cm3||110ºCx24h||2.2-2.4||2.2-2.4|
|Cold Crushing Strength, MPa||110ºCx24h||70||80|
|Linear Dimensional Change%||1100ºCx3h||±0.4||±0.4|
|Maximum Service Temperature ºC||1300||1400|
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