Crushers are designed to break up hard rock to liberate valuable minerals trapped inside the rock. Crushers come in a wide range of operating principles and sizes, depending on the required use. Crushers can only take in rock of a certain size, and put out rock of a certain size; each crusher can only handle a certain size feed and product size. This is why often multiple stages of crushing usually have to be performed to take feed material to its target size. A primary crusher would be used to reduce the size of your rock, and then a secondary crusher would be used to further reduce the rock and pass it through to the plant.
At a small scale, APT supply crushers starting with the Jaw Crusher JC25. This would be used simply as a primary crusher, and so the rock is broken down and prepared for secondary crushing. The crusher following on from the JC25 would be our RDGK plant, which has a crusher incorporated with our GoldKacha concentrator. Hard rock is crushed and passed into the GoldKacha, which would prepare your concentrates for final upgrade. The upgrader used could simply be a panning dish, or for greater recovery you could opt for the GoldKonka or GoldMasta sluice.
APT uses Jaw Crushers and RD Hammer Mills in the majority of our plants.
Grinding Mills are used as a final size reduction method and can take minerals down to below 75microns. Mills are usually a rotating cylinder filled with steel rods or balls which grinds the rock as the cylinder rotates. Mills are typically large, expensive pieces of equipment with very high power requirements. Mills should only be used in specific cases when there is no alternative.