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How To Cheaply Improve The Grade Of Your Copper Ore As An Artisan Miner In Zambia
Shaking tables are a type of gravity concentration technique used to upgrade the copper content in crushed ore prior to the leaching stage you described earlier. Here's how they fit into the copper concentration process:
- Application: Shaking tables are particularly effective for separating coarse copper particles (around 100 micrometers to a few millimeters) based on their density differences. Copper minerals are generally denser than waste rock minerals.
- Process: The crushed ore is fed onto a shaking table with a specially designed deck that tilts and shakes at a controlled rate. Water washes the ore pulp across the deck.
- Separation by Density: Due to the shaking and water flow, the denser copper minerals tend to settle lower on the deck and move towards the concentrate discharge point. Lighter waste rock minerals travel further and exit at the tailings discharge point.
- Benefits: Shaking tables offer a simple , low-cost , and environmentally friendly way to pre-concentrate copper ore by removing some of the lighter waste rock. This increases the feed grade entering the leaching stage.
- Limitations: Shaking tables are less effective for fine copper particles (less than 100 micrometers) that can be lost in the tailings with the waste rock. For these finer particles, flotation or other techniques may be needed after grinding the ore even finer.
Overall, shaking tables play a vital role in the copper concentration process by providing a cost-effective way to increase the copper content of the ore before the leaching stage. This improves the efficiency of the leaching process and reduces the amount of chemicals and energy required to extract the copper.