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Characterization for simulating flotation plants: kinetic parameters by grade and size

Characterization for simulating flotation plants: kinetic parameters by grade and size. Authors. Keila L. Gonçalves a , Claudio L. Schneider b * , Ronald H. Rojas b & Marisa M.Monte b (a) Vale – Centro de Desenvolvimento Mineral, Brazil

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Characterization for simulating flotation plants: kinetic parameters by grade and size

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  1. Characterization for simulating flotation plants: kinetic parameters by grade and size

  2. Authors • Keila L. Gonçalves a, Claudio L. Schneiderb*, Ronald H. Rojasb & Marisa M.Monteb • (a) Vale – Centro de Desenvolvimento Mineral, Brazil • (b) CETEM – Centro de Tecnologia Mineral, Brazil

  3. MOTIVATION Design and scale-up of flotation plants for Green Field projects at Vale’s CDM • Copper ores • Iron ores • Apatite ores • Other projects

  4. OBJECTIVES • To establish a procedure for complete characterization of kinetics parameters for pre-determined conditions: “the soup” • To be able to measure hydrodynamic parameters (bubble size distribution) • To be able to simulate Mini Pilot Plant test results • To be able to scale-up for industrial flotation

  5. THE MODEL

  6. THE MODEL AS IMPLEMENTED IN MODSIM

  7. THE MODEL PARAMETERS

  8. THE MODEL PARAMETERS ANGLO PLATINUM BUBBLE SIZER Bubble size distribution and bubble residence time

  9. THE MODEL PARAMETERS CPP Mini-Pilot Plant Froth transmission coefficients Calibration of flotation parameters

  10. THE MODEL PARAMETERS All kinetics parameters

  11. KINETIC PARAMETERS PROCEDURE • Run a preliminary kinetics test to determine optimum flotation times • Run repeated kinetics tests at optimum flotation times to produce enough material in each time interval • Make composite samples of each time interval and sinks • Sieve each time interval and sinks in 2 size intervals • Analyze each time-size fraction in the MLA to determine the contribution of each particle type • Calculate all kinetics parameters

  12. KINETIC PARAMETERS ANALYSIS Particles that floated between 10 and 20 seconds Conditional on size distributions

  13. KINETIC PARAMETERS ANALYSIS Particles that did not float after 120 seconds Conditional on size distributions

  14. MEASURED FLOTATION RATES

  15. MEASURED ULTIMATE RECOVERIES

  16. CONCLUSIONS • We don’t see fundamental flotation rates (as by definition) because transport controls the process of production. (particles and bubbles rise much slower than the attachment-detachment processes) • Ultimate flotation recoveries control the selectivity of the flotation for this system. • Particles of about 212 microns are unfloatable • Recovery is maximum for particles smaller than 53 microns.

  17. ACKNOWLEDGEMENTS This work has been sponsored by Vale and CNPq

  18. QUESTIONS?

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