BSD | - | Bubble size frequency distribution |

C | - | Viscous drag coefficient |

D | mm | Characteristic bubble size diameter |

D | mm | Sauter mean bubble diameter, total volume of the bubbles divided by total surface area of the bubbles. |

D | mm | Number mean bubble diameter, total bubble diameter divided by total number of bubbles. |

D | mm | Sauter mean bubble diameter into overflow (subscript O for “into overflow”) |

D | mm | Sauter mean bubble diameter on top surface of froth (subscript T for “top surface of froth”) |

D | µm | Characteristic particle size diameter |

D | µm | The diameter of particles which collide with the rising bubble |

E | % | Gas hold-up, volumetric fraction of gas |

J | m/s | Superficial gas velocity, volumetric gas flow rate divided by cross sectional area of the reactor. |

J | cm/s | Superficial overflow rate into overflow (subscript O for “into overflow”) |

P | - | Probability of collection |

P | - | Probability of collision between particles and bubbles |

P | - | Probability of adhesion between particles and bubbles |

P | - | Probability of detachments |

Re | - | Bubble Reynolds number |

S | 1/s | Bubble surface area flux, total surface of gas generated per unit of time and per unit area of the reactor. |

S | 1/s | Bubble surface area flux into overflow (subscript O for “into overflow”) |

Xs | % | Solid concentration in slurry |

Greek letters | ||

α | % | Air recovery, the fraction of air overflowing the lip of a flotation cell in unbroken bubbles. |

r | g/cm | Bulk density |

r | g/cm | Density if solids |

µ | g/cm*s | Kinetic viscosity |

g | cm/s | Gravitational constant |

δ | µm | Equivalent water film thickness carried by each bubble |

φ | - | Volumetric fraction of solids in slurry |