Alumina media are ceramic balls used for grinding materials in a ball mill. The ground materials are then ready to be placed in a dispersion tank and incorporated into a liquid or can also be mixed into a dry material. This type of grinding media is used in manufacturing paint, ink, epoxy resins, and in water treatment plants. Alumina media is also used in a special, smaller type of ball mill called a planetary ball mill. This type of mill is used in labs to grind sample material down to very small sizes. The smaller the grinding balls, the smaller the final product will be.
- Corrosion Resistance – Alumina media is resistant to corrosion and abrasion, so it can be used in corrosive chemicals, acids, and salts.
- Heat Resistance – Alumina oxide balls maintain stability at temperatures up to 3,180ºF.
- Strength – Alumina is a very hard material (Hv 1700) that is resistant to abrasion, corrosion, and heat.
- Surface Area – Alumina has a very high surface area to weight ratio because of how porous it is.
- Economical – Alumina is an extremely high value material and affordable for solving a wide variety of problems.
- Labs – Alumina media is commonly used in planetary ball mills, jar mills and attritors to grind materials down to very minuscule sizes. Because of its non-reactivity and resistance to corrosion, alumina media is perfect for grinding dangerous chemicals and materials for use in tests.
- Industrial Mixing/Dispersion - In industrial mixing and dispersion, powders or soluble materials are incorporated into a liquid or powder. Alumina grinding media is used to grind down the material in a ball mill before it is placed in the dispersion tank. This allows the material to be more easily incorporated into the liquid or powder. This is good for making pigments, paint, ink, and epoxy resins.
Alumina is a good grinding media for use in ball mills of all kinds because of its durability, strength, and non-reactivity.