1. adhesion of particles or particles to surfaces SLIME COATING AND COAGULATION

2. Slime coating AFM-images of slime coatings on mineral surface M.E. Holuszko et al., Minerals Engineering, 21, 2008, 958-966

3. Slime coating Very important phenomenon Can be useful and harmful Ferric oxide slime and flotation of quartz with 10 -4 M dodecyl ammonium acetate Chemistry of flotation, M.C. Fuerstenau, J.D. Miller, M.C. Kuhn, AIMM, 1985

4. Alumina as slime on galena and flotation with xanthate

5. coagulation homocoagulationheterocoagulation main parameter: stability ratio W

6. Process delineation (thermodynamics)  G k = G h – G   G k =  G k d +  G k el +  G k s +  G k inne That is components: dispersion (d), electrical (el), structural (s), a others

7. Dispersion interactions H – distance between particles, m R – diameter of particle, m A 132 – Hamaker constant, J phase 1 phase 2 phase 3

8. Dispersion interaction

9. Hamaker constantDispersion interaction

11. Electrostatic interaction  1 – particle electrostatic potential, V,  2 – the other particle electrostatic potential, V, R 1 – particle radius, m, R 2 – the other particle radius, m,  – dielectric constant (usually water)  0 – dielectric permeability in vacuum, 8,854187817·10 –12 C 2 N –1 m –2 1/  – Debye radius (thickness of ewp), m, H – distance between interacting objects, m.

12. Electrostatic interaction

13. For flat particles For spherical particles K, K*, E s o - constants l - parameter correlating standing for thickness of oriented water molecules at the surface of particle H - distance between particles R - radius of particles Structural interaction

14. Total interaction

16. Stability ratio W

17. Time of half-life t 1/2 of hypothetical emulsion containing 1  m droplet and having energy barrier V max one radius apart from the droplet surface (after Friberg, 1991)

18. Main parameter: stability ratio W

20. selective coagulation