Table 1. Comparison of Gas Dispersion Parameters in Different Flotation Devices.

flotation devices	experimental reagents	methods	maximum gas holdup (%)	D32 (mm)
flotation column9	MIBC = 0.11 mmol/L; F150 = 0.05 mmol/L	McGill bubble viewer; differential-pressure method	9.8; 13.4	1.1; 0.7
continuous bubble column47	hexanol/PO molar mixing ratio = 1/0.1, 60 ppm	McGill bubble size analyzer; conductivity method	11.9	1.0
cyclone-static microbubble flotation column48	P = 0.34 MPa; Qg = 2.50 m3/h; pine oil = 10, 15, 20 mg/L; D = 6 mm	differential-pressure method	12.14; 12.54; 12.8
column flotation cell49	Jg = 1.47 cm/s; MIBC = 10, 20, 30 ppm	differential-pressure method	9; 13; 18	2.06–1.04;
downflow column13	MIBC = 8.1 mg/L; Jg = 1.32 cm/s	viewing system; drainage method	21	0.65
industrial flotation cell50	freon 13B1 as gas tracer	local gas holdup measurement	8.8
laboratory Denver flotation cell44	MIBC = 22.4 ppm; Jg = 0.9 cm/s; impeller peripheral speed = 4, 5, 6 m/s	McGill bubble viewer; drainage method	8; 13; 24	0.43–0.11