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Iron Mineral Recovery in Iron Tailings - Weihai Iron Ore Concentrator
Weihai is the largest iron ore Shandong Peninsula iron mines, ore processing 25 years to 30 million t, 8 annual output of iron ore concentrate to 10 million t, annual emissions of more than 12 million t of tailings to the tailings. Branch taken tailings analysis known tailings grade 5.92%, mainly mineral magnetite metal, followed by pyrite, pyrrhotite, and then followed by hematite, limonite, sphalerite, yellow copper ore, chalcocite; gangue minerals are serpentine, diopside, tremolite, followed olivine, phlogopite, again plagioclase, quartz, talc, sericite, epidote Chlorite. Some non-magnetic and weak magnetic minerals and continuous organisms exist in the tailings. The composition is shown in Table 1. The results of sieve size analysis of tailings are shown in Table 2.
Table 1 Iron composition in tailings (%)
Project
Non-magnetic mineral
Weak magnetic mineral
Concentrate loss
Process equipment
unusual
Total
Quality score
2.64
1.82
1.40
0.06
5.92
proportion
44.59
30.74
23.56
1.02
100.00
Table 2 tailings size screening results
Particle size / mm
Yield/%
grade/%
Particle size / mm
Yield/%
grade/%
+0.5
4.70
3.52
0.074～0.042
16.26
5.94
0.5 to 0.35
4.54
3.76
-0.042
15.23
5.47
The original ore beneficiation plant production process characteristics, before adding the final tailings original apparatus for recovering a tailings re-election of iron tailings recycling, while the return ore concentrate with backwater pump field into the tailings also Select equipment. The process flow after the transformation is shown in Figure 1.
Figure 1 Process after the transformation
The actual production shows that the tailings grade can be reduced by 2.63% and the metal recovery rate by 5.63% through the tailings re-election process. According to the annual processing of 200,000 tons of raw ore, it can recover 4,931 hours of iron concentrate, and increase economic benefits by 1.509 million yuan.