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FLOTATION frothers

FLOTATION frothers.  G flotation = G final - G initial = [  sg - (  sl +  lg )] A.  sg =  sl +  lg cos . w hen  = 0 o , cos = 1,  G flotation = 0, no flotation w hen  = 90 o , cos = 0,  G = -  l g . full flotation

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FLOTATION frothers

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  1. FLOTATION frothers

  2. Gflotation= Gfinal- Ginitial = [sg - (sl+ lg)] A sg = sl+ lgcos when  = 0o, cos = 1, Gflotation= 0, no flotation when= 90o, cos = 0, G = -lg. fullflotation Thus, flotationreagentscan be classifiedinto • collector (decreases G) • frother (no ornegligablechange of G) • depressor (increases G)

  3. FROTHERS Role of frother 1. Gas dispersion 2. Froth formation 3. Speeding up flotation 4. Improvingselectivity of flotation (by interaction with collector)

  4. FROTHERS frother structure with depth

  5. frother structure H. Khoshdast, A. Sam,Flotation Frothers: Review of Their Classifications, Properties andPreparation, The Open Mineral Processing Journal, 2011, 4, 25-44 25, 1874-8414/11 2011

  6. Other classifications of frothers H. Khoshdast, A. Sam,Flotation Frothers: Review of Their Classifications, Properties andPreparation, The Open Mineral Processing Journal, 2011, 4, 25-44 25, 1874-8414/11 2011

  7. Neutralfrothersapplied in flotation Laskowski, 1988 (with somemodifications) FROTHERS

  8. Other classifications of frothers Frothersclassification (Lekki and Laskowski, 1974)

  9. Properties of frothers CMC MIBC – metyloizobutylokarbinol CMC – criticalmicellizationconcentration Collector ions can be present in aqueous solution as free ions(a), premicellar species, (b)spherical micelles (c). Structures appear with increasing surfactantconcentration in aqueous solution. Symbol o denotes ion appositively charged to surfactantion

  10. CCC Properties of frothers DF250 Data of Finch, J.A., Nesset, J., Acuna, C., 2008, Role of frother on bubble production and behaviour in flotation, Miner. Eng., 21, 949–957. CCC95denotes 95% in Sauter mean bubble size reduction compared to mean bubble size in water only. Plotted by Kowalczuk, Ind. Eng.Chem. Res., 2013

  11. in flotationimportantisdynamicsurfacetension Atrafi et al., 2012, MineralEng., vol. 36-38, 138-144

  12. CCC vs frother dose Relationshipbetweenflotationselectivitycoefficienta and concentration of CxPyfrother. ppm = g/dm.Notelocation of CCC. Kowalczuk, Ind. Eng.Chem. Res., 2013

  13. HLB (Hydrophobic - Lipophilic balanse) HLB = 7 + hydrophilicgroups – lipophylicgroups Hydrophilicgroups -O- 1.3 -OH (free) 1.9 -OH (sorbitan ring) 0.5 -SO4Na 38.7 -COOK 21.1 -COONa 19.1 -COOH 2.1 -SO3(H) (sulfonate) ~11 -tertiary amin 9.4 -ester (free) 2.4 Lipophilicgroups -CH, –CH2–, CH3–, =CH–0.475 -(CH2-CH2-CH2-O–) 0.15

  14. Application of surfactantsdepending on their HLB

  15. CCC vs HLB Kowalczuk, Ind. Eng.Chem. Res., 2013

  16. DFI and other Comparison of differentfrothersproperties (DI, CCC, Jw) and ability to mechanicalflotationmax. Theyaresimilar (Szyszka et al., 2008)

  17. Quartzflotation in the presence of differentfrothers (Szyszka et al., 2008)

  18. Drzymala, unpublished , 2013

  19. a– selectivitycoefficient of flotation  – useful component recovery in concentrate r – non-usefulcomponentsrecovery in tailing Drzymala, unpublished , 2013

  20. Frother properties Zhang, W., Nesset, J.E., Rao, R., Finch, J.A., 2012, Minerals, 2, 208–227.

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