Reduction of Magnetite in the Presence of Activated Carbon Using Mechanical Alloying

Table 2

MAS parameters of the ball-milled magnetite and graphite mixtures (1 : 3 mole ratio) at different ball to powder ratios (BPR), while rotational speed and milling periods were kept constant at 400 rpm and 20 hours, respectively.

BPR	MAS parameters			^■% Content	Phases
	^#δ/mms^−1	^#Δ𝐸𝑄/mms^−1	* 𝐵hf/T
0	0.29	0.01	49.2	100	Fe3O4
	0.66	0.01	46.0
20 : 1	0.29	0.01	48.5	90	Fe3O4
	0.61	−0.01	45.1
	0.35	1.42	—	5	Fe^3+
	0.77	1.38	—	5	Fe^2+
30 : 1	0.29	0.02	48.4	42	Fe3O4
	0.63	−0.05	45.0
	0.27	0.38	—	6	Fe^3+
	0.89	0.96	—	52	Fe^2+
40 : 1	0.28	0.02	48.4	16	Fe3O4
	0.68	−0.05	45.0
	0.28	0.44	—	11	Fe^3+
	0.89	0.92	—	73	Fe^2+
50 : 1	0.28	0.44	—	11	Fe^3+
	0.89	0.92	—	89	Fe^2+
60 : 1	0.28	0.44	—	12	Fe^3+
	0.89	0.92	—	88	Fe^2+

Error: ^#±0.02 mms⁻¹, *±0.5 T, ^■±1.0%.