Cost-Effective Treatment of Hemihydrate Phosphogypsum and Phosphorous Slag as Cemented Paste Backfill Material for Underground Mine

Table 3

Leaching elements in the HPG, PS, and backfill bodies by HVM.

Specimens	Elements (mg/L)
	P	F	Fe	Mn	Cu	Zn	As	Pb
HPG	3528	5.3	1.35	1.4	0.1	0.05	<0.001	0.04
PS	18	3.2	0.92	<0.0001	0.05	0.04	0.01	0.01
S22 cured for 28 days	0.62	0.82	0.04	<0.0001	0.006	0.004	<0.001	<0.001
S23 cured for 28 days	0.38	0.67	0.05	<0.0001	0.009	0.005	<0.001	<0.001
Category III of DZ/T 0290-2015	0.5	1	0.3	0.1	1	1	0.01	0.01
Category IV of DZ/T 0290-2015	—	2	2	1.5	1.5	5	0.05	0.1