Mullite sand and mullite powder are important alumina silicate refractory materials, widely used in precision casting refractory materials, ceramics, building insulation and other fields. Here are their detailed uses:

I. Main components and characteristics

The main components of mull sand and mullite powder are mullite, and their chemical composition includes alumina (Al₂O₃) and silica (SiO₂), with Al₂₃ content usually ranging from 42% to 75%. They have the following characteristics:

High refractoriness: The refractoriness is generally above 100℃, and some products can reach 1750℃-1800℃.

Low coefficient of thermal expansion: They are not easy to deform at temperatures, ensuring the stability of the mold in the casting process.

Low iron content: Low iron content (Fe₂O₃ is usually less than 1.5%) helps the impact of impurities on castings.

High bulk density: The density is generally between 2.5-3.35 g/cm³.

II. fields

（1）Precision casting

Face coat and back coat: Mullite powder is often used in the preparation of back coats, mixed with zircon powder, silica sol,., which can improve the strength and refractoriness of the mold.

Strengthening layer and plugging paste: Mullite powder and mullite sand are used in strengthening layer and plugging paste to ensure the structural stability of the mold.

Advantages: The casting is easy to demold, does not deform, does not shrink, good surface finish, and high yield.

（2）Refractory materials

Mullite sand and mullite powder are used in the production of metallurgical furnace linings, refory bricks, refractory concrete, etc., which can withstand high-temperature environments and extend the service life of equipment.

（3）Ceramics industry

As ceramic raw, mullite sand and mullite powder can improve the heat resistance and mechanical strength of ceramic products.

Building insulation

It is used as thermal insulation and fireproof material high-temperature industrial equipment, with good insulation performance.

（4）Other fields

It is also widely used in machinery, aviation, metallurgy, petroleum and other industries.

III .Packaging and transportation

Mullite sand and mullite powder are usually packed in 25kg plastic woven bags or kraft paper bags, and some support custom ton. During transportation, it is necessary to pay attention to moisture-proof to avoid affecting the performance of the material due to dampness.

Mullite sand and mull powder have become indispensable refractory materials in modern industry because of their excellent performance and wide application.