Statistically significant interactions between the z50 parameters and the magnetic separator drum rotation speed (S); magnetic field (H) and feed rate (W).

Table 4: Statistically significant interactions between the z₅₀ parameters and the magnetic separator drum rotation speed (S); magnetic field (H) and feed rate (W).

Magnetic susceptibility class (× 10⁶ m³/kg)
Size (mm)		0-8			8-22			22-46			46-109			109-212			+212
Top	Bottom	S	H	W	S	H	W	S	H	W	S	H	W	S	H	W	S	H	W
	3.35	-	0	0	-	+	0	0	+	0	+	0	0	+	0	0	0	0	0
3.35	2.36	-	0	0	-	+	0	0	+	0	+	0	0	+	0	0	0	0	0
2.36	1.18	0	0	0	0	+	0	+	0	0	+	0	0	+	0	0	+	0	0
1.18	0.60	0	0	0	0	+	0	+	0	0	+	0	0	+	0	0	0	0	0
0.60	0.60	-	0	0	0	+	0	+	0	0	+	0	0	+	0	0	+	0	0
0.21	0.00	-	0	0	0	+	0	+	0	0	+	0	0	+	0	0	+	0	0

+: Positive significant effect; -: Negative significant effect; 0: No significant effect.