Baozhu sand has also become fused ceramic sand. Its raw material is high-quality bauxite, which is smelted in an electric arc furnace. Baozhu sand has a wide range of uses. It can be used in various casting methods such as investment, solid, and lost foam. It is a new type of casting sand for professional precision casting and coated sand. It is also used for shot blasting of aluminum, copper, and steel castings. Processing.

The cost performance of 　　 precious pearl sand is better than zircon sand and chromite sand. It has a low expansion coefficient, no sintering, no powdering, no cracking, no sticky sand, and good regeneration performance. The advantages are particularly obvious.

　　 1. With a small thermal expansion coefficient, the molding sand prepared with it as a raw material will not cause expansion defects in the casting, and its performance can even be comparable to zircon sand.

　　2. The spherical sand grain has good fluidity, is easy to pound, and has good air permeability.

　　3. It has a smooth surface and a dense structure, so that the adhesive can cover the surface evenly.

　　4. As a neutral material, gemstone sand is suitable for acid and alkali binders.

　　5. It can be recycled and reused and has a high cost performance.

The price of  gemstone sand is only 30-50% of zircon sand and chromite sand. It is spherical sand particles with a small surface area, so the amount of resin added can also be reduced by 30-50%, and the amount of water glass added is less than 4%. It can also improve the yield of castings.

　　The application range of gemstone sand is very wide, such as sodium silicate sand, resin sand, precision casting and polishing and cleaning of copper and aluminum parts.