Definition of comminution
Comminution in mining refers to the process of reducing the size of mined ore through crushing and grinding. In the comminution process, the goal is to break down the ore into smaller particles to separate valuable minerals from the surrounding rock (gangue). The particle size has to be reduced to a suitable level for downstream processes such as flotation, leaching, or gravity separation.
The Process:
- Crushing: Large chunks of ore are broken down into smaller pieces using equipment like jaw crushers, cone crushers, and gyratory crushers.
- Grinding: The crushed ore is further reduced in size using equipment like ball mills, rod mills, and vertical mills, producing a fine powder.
In essence, comminution is the crucial first step in mineral processing, comparable to preparing ingredients for a recipe. By breaking down the ore into smaller particles, it allows for the efficient separation and recovery of valuable minerals.
Importance of particle size analysis in the Grinding circuit
In the grinding circuit typically crushers and mills are used to grind the material and reduce the particles to a certain size. This process is high energy-consuming, especially when over- or undergrinding takes place. Therefore, measuring particle sizes in real-time allow the process team to better control their processes by adjusting the variables in real time to achieve optimal operational conditions and enabling an increase in throughput. As described in the definition of comminution, the particles size should be reduced to make downstream processes run efficiently and have the maximum recovery of valuables.
