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Eluvial Chromite Separation

Application Description

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%.


Share Your Knelson Experience
"As a ore beneficiation investigator through our laboratory at the University, we have made experiments and tests in Venezuelan gold and other heavy minerals. One of our machines is the KC 3" for gravity concentration. We have tested material from a pond that has a grade of 0.829 g/ton in grains 81,25% 400 mesh. In second step, where we controlled pulp, % solid weight, feed, water fluid and we recover 8,49 g/ton. Also, the equipment is currently used in the student practices every semester, in a subject named Mineral Preparation and Concentration in 4th year plan for the future mining engineer." - Monica Martiz, Mining Engineer - Universidad Central de Venezuela, Venezuela ...more > >
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