Autogenous grinding was word of the week, for the first week of 2022. “Word of the Week” is a weekly publication on this website. The word of the week also gets explained more in-depth, during the weekly show “What’s Cheap”.
Autogenous grinding is is a process of grinding ore in a mill, by using large pieces of the same ore. It operates quite like a rod mill, or a ball mill, but the grinding materials (media) differ, because autogenous mills simply use larger ore to mill other ore, instead of balls or rods.
As you guessed already, this makes the milling process cheaper. That’s because the ore that is being ground, is being ground by the same ore, which doesn’t come at an additional cost. Whereas ball mills use other grinding media, like steel balls for example, which can get expensive.
Balls mills & rod mills also need the grinding media to be replaced over time. With autogenous grinding, there is less wear of the metal, and there is (almost) no need for a secondary grind.
Autonomous grinding is cheaper in operational costs, but also in capital expenses.
This makes this type of milling very attractive and growing in popularity.
Below you can see a video from 911 Metallurgy Corp, that gives an in-depth look into an autogenous mill.
If you want to know more about autogenous grinding, because there really is a whole lot more to know, visit this page: https://www.911metallurgist.com/blog/ag-autogenous-grinding