Design and Application of Rapid Dewatering for Tailings Containing Sodium Silicate: Laboratory and Industrial Test Results

Table 3

Comparison of different dewatering schemes.

No	Items	L&A	S&A	C&A
1	Dosage of reagents
1.1	Lime (kg/t)	2
1.2	H2SO4 (kg/t)		2.6
1.3	CaCl2 (kg/t)			3
1.4	APAM (g/t)	30		30 g/t
1.5	NAPAM (g/t)		20
2	Reagent cost (US $/t)	0.27	0.31	0.39
2	BHC (t/(m^2·h))	0.54	0.49	0.59
3	SCOW (ppm) in 24 hours	>300, after 10 hours	<300	<300
4	pH after 24 hours of operation	14	4	8
5	Underflow concentration	<70 wt.% after 12 hours	>70 wt.%	>70 wt.%
6	Additional devices
6.1	Defoaming device	2 (one for spare)
6.2	Neutralization system for pH	2 (one for spare)	2 (one for spare)
6.3	Anticorrosion treatment		1