How to choose high-quality alumina grinding balls, is the key to efficient and effective grinding processes. Here are some key factors that can be taken into consideration:

Material and purity:

• Alumina content: Choose the alumina balls with an alumina content of 92% or higher. Can ensure high hardness, wear resistance, and good strength.

• Sintering process: Compared with rolling or general dry pressing methods, produced through isostatic pressing, which leads to uniform density and superior quality.

• Firing process: Slow firing in a tunnel kiln is preferable to roller kiln firing. Because in tunnel kiln can result in more consistent and thorough sintering throughout the ball.

Physical properties:

• Hardness: With a Mohs hardness of 7/8 or higher. Can make the alumina ceramics balls grind more hard materials effectively, without excessive wear.

• Density: Higher density (around or over 3.6 g/cm³) means greater grinding efficiency and impact force.

• Surface quality: Choose grinding balls with a smooth and uniform surface free of cracks, chips, or voids. Because roughness balls will hinder grinding performance and increase contamination risks.

Size and gradation:

• Ball size: According to the type and size of being ground materials, select the appropriate grinding ball size. Generally, larger balls are used for coarser grinding, while smaller balls are better for finer grinding.

• Gradation: A proper mix of different ball sizes (e.g., 4:4:2 ratio of large, medium, and small balls) optimizes grinding efficiency and prevents ball caking.

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