BSD

-

Bubble size frequency distribution

C_pb

-

Viscous drag coefficient

D_b

mm

Characteristic bubble size diameter

D₃₂

mm

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

D₁₀

mm

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

D_bO

mm

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

D_bT

mm

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

D_p

µm

Characteristic particle size diameter

D_c

µm

The diameter of particles which collide with the rising bubble

E_g

%

Gas hold-up, volumetric fraction of gas

J_g

m/s

Superficial gas velocity, volumetric gas flow rate divided by cross sectional area of the reactor.

J_wO

cm/s

Superficial overflow rate into overflow (subscript O for “into overflow”)

P

-

Probability of collection

P_c

-

Probability of collision between particles and bubbles

P_a

-

Probability of adhesion between particles and bubbles

P_d

-

Probability of detachments

Re

-

Bubble Reynolds number

S_b

1/s

Bubble surface area flux, total surface of gas generated per unit of time and per unit area of the reactor.

S_bO

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/cm³

Bulk density

r_s

g/cm³

Density if solids

µ

g/cm*s

Kinetic viscosity

g

cm/s²

Gravitational constant

δ

µm

Equivalent water film thickness carried by each bubble

φ_s

-

Volumetric fraction of solids in slurry