Ceramic Grinding Media

As mining companies work on mineral liberalisation from increasing di cult orebodies, ultra ne grinding equipment and ceramic grinding equipment and ceramic grinding media play a major role in making these recoveries cost e ective.

Improvements in energy e ciencies, cyanide usage reduction, product recovery and reduced maintenance costs are some of the bene ts of using Annexus WA grinding media.

Annexus WA o ers a range of ceramic grinding media options for use in the ultra- ne grinding process. Annexus WA grinding media is suitable for use in ISA Mills, VXP Mills, HIG Mills and SMD Mills. Our grinding media is available in a range of sizes, densities and compositions.

Supplied in 1-2MT bulk bags for ease of shipping, handling and dispensing.

The production process is strictly controlled by a robust quality assurance system that is underpinned by an ISO 9001 certi cation.

Products and Forming Methods

Ceramic grinding media can be manufactured from a range or raw materials and can be formed by either the rolled or sol- gel-cast manufacturing method. Factors like composition and manufacturing method in uence the quality of the grinding media. The material composition also determines the density of the ceramic grinding media and hence its impact force.

Raw materials consist of carefully controlled nano-sized Zirconia Toughened Alumina particles.

In the production of ceramic grinding media, beads can be formed using sol-gel methods (dripping) or by the pelletising of dry powder (rolling). Dripping refers to the forming of beads by pumping micronized slurry through a nozzle into a gelling solution. The beads are then conditioned, washed and dried. Rolling refers to the granulation from spray dried powders. The rolling process is started with seed crystals and the beads are then grown to the required size.

Annexus WA is equipped to supply both forming methods There are advantages and disadvantages to each forming methods. The main advantage of rolled media is better sphericity and surface nish. Dripped media has a more consistent internal integrity. The disadvantages of rolled beads is that the layered structure can lead to chipping, skinning and internal damage to the bead.

We suggest the dripping method for beads smaller than 6mm due to the lower cost and more consistent wear properties.