XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3 3679
Ordinary iron ore
concentrate
Pre-concentration
Magnetic separation
Second stage grinding
-30 m 92.05%
Electromagnetic Selection 2
Electromagnetic Selection 1
Roughing
Weak magnetic separation tailings
Yield Grade
Recovery
100.00 65.82
100.00
93.80 68.31
97.34
87.45 71.49
94.98
6.35 24.64
2.36
86.64 71.58
94.22
3.54 69.34
3.72
58.89 71.88
63.98
83.10 71.67
90.50
(%)
Pre-concentration tailings Ball grinding -38 m
92.29%
6.20 28.11
100.00
1.0×105 A/m
0.81 61.88
0.76
Middlings 1
Reverse flotation
tailings
Reverse flotation
concentrate
24.51 71.17
26.52
Middlings 2
Figure 7. Flow chart for the pre-concentration and magnetic separation-reverse flotation processes
0 10 20 30 40 50
70.0
70.5
71.0
71.5
72.0
Sample serial number
TFe
SiO
2
Acid insoluble matter
0.0
0.1
0.2
0.3
0.4
0.5
0 20 40 60 80 100 120
70.5
71.0
71.5
72.0
72.5
Sample serial number
TFe
Acid insoluble matter
0.0
0.1
0.2
0.3
0.4
0.5
Figure 8. Stable operation test of high-purity iron concentrate preparation (a-pilot scale, b-industrial scale)
Grade
(%)
Content
(%)
TFe
grade
(%)
Acid
insoluble
matt
content
(%)