The Continuous Variable Discharge concentrator (CVD) has been successfully applied in the separation of Eluvial Chromite. Chromite has a specific gravity of 4.6 against a background gangue gravity of approximately 2.7. The CVD is used as a rougher in this application and maximizes chromite recovery and minimizes mass pull to concentrate.
Historically, eluvial chromite has been separated in large spiral concentrator plants. A CVD coupled with a Mozley MGS has proven to produce superior metallurgical performance over much larger spiral plants.
Benefits
Superior metallurgical performance over existing gravity plants
Small size to facilitate mobility when necessary
Ability to process ores with high clay/slimes content
Low operating cost
Application
Eluvial chromite can be separated in an all-gravity flowsheet with a CVD. Run of mine feed is washed and screened to minus 1.5mm and fed to the CVD. The CVD produces a chromite concentrate that's sent to final upgrading in a spiral separator. The CVD treats fresh feed and a circulating load of tails from the spirals that is classified in a hydrocyclone. The gravity circuit shown depicts a CVD concentrator as the primary unit operation, achieves recoveries in excess of 90% with saleable chromite grades of 45%.
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"I've been to several large copper mines that use Knelson concentrators. My understanding is that they are industry standard, so why use anything else?"
- Adam Graf, Mining Analyst - Bear Stearns, USA
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Benefits
