Grinding Technologies

Understand how industrial ball mills reduce particle size through the impact and abrasion generated by grinding media inside a rotating shell.

Understand how longitudinal rods inside a rotating shell use line contact to reduce coarse particles into a controlled intermediate product.

Understand the circuit duty of semi-autogenous grinding, which combines coarse ore with a controlled ball charge.

Capacity is not a motor-power or shell-size lookup; it is an engineering result that connects material behaviour, size target, energy demand and circuit performance.

Critical speed is a geometric limit, while actual operation depends on media charge, liners, material and the process objective.

Build rod-mill sizing on representative test data and complete circuit duty rather than catalogue values.

Size a SAG mill as part of a verified grinding circuit that accounts for ore variability and downstream stages, not as an isolated machine.

Despite similar rotating shells, ball and rod geometry changes particle contact and the grinding behaviour expected from the circuit.

A SAG mill uses the ore itself as part of the grinding medium, while a ball mill relies more directly on a defined ball charge.

The choice depends not only on the mill but on how the product will be transported, classified and delivered to the next process step.

Open circuits pass material through the mill once, while closed circuits classify the discharge and return the coarse fraction for further grinding.

Maintenance is not a calendar alone; it is a controlled system that tracks wear, lubrication, drive and operating trends against manufacturer instructions.