Discrete Element Modelling in WA Mining: Getting It Right Before the Build
Ore doesn’t behave. It bridges in chutes, packs into corners, throws itself against crusher liners and finds every weak point in a design that looked fine on the screen. Now wet it with torrential rain and see if behaves the same. (It doesn’t). DEM analysis for mining in Western Australia has become one of the most useful ways to see that behaviour before a single component is built. At Element Mechanical Design we use discrete element modelling (DEM) to simulate how bulk material actually moves through the machines that handle it, so the design is right the first time.
What discrete element modelling actually does
DEM treats bulk material as what it really is: thousands or millions of individual particles that collide, slide, pack and separate. Instead of guessing how ore will flow through a chute or a crushing chamber, we simulate every particle interacting with the equipment and with itself. The result is a realistic picture of flow, load and wear that you can watch, measure and change before the design is locked in.
For mining that matters. The machines are large, the material is abrasive and a design that flows poorly costs money every hour it runs.
Crusher design: getting the chamber right before it’s built
Element Mechanical Design has used DEM for crusher design, and it’s one of the clearest examples of the payoff. Crushing is violent, and the geometry of the chamber decides how well it works. Model the material flow and you can see throughput. You can simulate where the rock packs and the wear pattern forming on the liners. Then we can optimise the chamber before anything is fabricated.
A crusher looks simple until you watch the rock move through it. DEM shows us where material packs, where it bridges and where the liners are copping the most wear, before anyone cuts steel. We’d rather fix that in the model than find it on site.
Daniel Berti, Head of Mechanical Design, Element Mechanical Design
SAG mills: putting the energy into the ore
SAG mills are another strong fit. A mill is really a large drum lifting a charge of ore and grinding media and dropping it. Where that charge lands drives grinding efficiency, power draw and liner wear all at once. DEM lets us test lifter profiles and operating speed. We can see the charge motion directly, rather than inferring it from power readings after the fact.
With a SAG mill the whole game is where the charge lands. Too much impact on the shell and you’re pulling liners out early. Get the lifters and the mill speed right in the simulation and the energy goes into grinding ore instead of wearing out the mill.
Daniel Berti, Head of Mechanical Design, Element Mechanical Design
Truck trays: loading, unloading and the rough road in between
The same physics applies to haulage. A truck tray is often treated as a steel box, but the load is live. DEM helps with loading (how the ore fills and settles), unloading (how cleanly it tips out) and the transport in between, when the tray flexes and the load shifts over rough terrain. On a long haul road those dynamics decide spillage, carryback and how hard the tray body gets worked.
Loading a tray is the easy bit. What matters is what the ore does over a rough haul road, when it shifts, spills and hammers the tray floor. We model that so the tray holds the load, spillage drops and less material rides home stuck to the floor.
Daniel Berti, Head of Mechanical Design, Element Mechanical Design
Why DEM analysis suits mining in Western Australia
DEM analysis for mining in Western Australia makes particular sense because of where and how the work happens. Sites are often remote. Iron ore is hard and abrasive. Plus downtime on a crusher or mill is expensive to fix and expensive to sit through. Getting the flow right in a simulation, before equipment ships to the Pilbara or the Goldfields, takes a lot of that risk off the table. It also shortens the loop between a design idea and knowing whether it holds up.
If you’re designing or upgrading equipment that moves ore, it’s worth bringing DEM in early rather than after the first set of liners wears out. Talk to Element Mechanical Design about putting DEM analysis to work on your next project.