Pyrite Cinder range than the susceptibility of various paramagnetic substance relatively narrow, small magnetic differences; degree of oxidation of Pyrite Cinder iron ore minerals are not complete, in addition to some form of magnetite (Fe 3 O 4 ) Outside, most of them are illusions and semi-artificial hematite (Fe 2 O 3 ). The deep oxidized hematite is not contained in most pyrite cinders, so the magnetic field strength required for magnetic separation is relatively low, and the midfield strong magnetic separation can recover some iron minerals.

Although the specific magnetic susceptibility of the main iron minerals in pyrite cinder is lower than that of natural minerals, the magnetic difference with gangue minerals is still very large. The magnetic separation method is used for separation. The key factors are useful iron minerals and gangue. The monomer of the mineral dissociates. Experimental Study of the separation of magnetic minerals pyrite cinder has conducted in Kunming University of different magnetic separation apparatus and Kunming Institute of Metallurgy, the pyrite cinder can be sorting by magnetic separation experiments show that the method of . (see table below)

Magnetic separation exploratory test

product name

Yield(%)

grade(%)

Recovery rate(%)

Fe

Pb

S

Fe

Pb

S

Concentrate 1#

23.66

60.17

0.31

0.55

28.48

21.57

7.48

Tailings 2#

76.34

47.61

0.31

2.11

71.52

78.43

92.52

Concentrate 3#

37.60

60.79

0.30

0.43

47.20

33.18

9.29

Tailings 4#

62.40

43.01

0.30

2.53

52.80

66.82

90.71

The pyrite cinder is sieved with a 100-mesh sieve to remove the coarse grade material, and the fine grade sieved product is subjected to magnetic separation. XCRS-φ4000×240 electromagnetic wet multi-purpose drum weak magnetic separator (Hubei Prospecting Machinery Factory) was selected. A part of the direct magnetic separation, the obtained products are 1# and 2#; the other part is ground by a rod mill for 2 minutes, and then magnetically selected to obtain 3# and 4# products. Grinding concentration C = 50%.

The pyrite slag is treated by magnetic separation to obtain a higher grade of iron concentrate, which can reach more than 61%, but the yield of the concentrate is low and the recovery rate is not high. The grinding slag after grinding is obviously better than the magnetic separation effect without grinding. The yield and recovery rate of concentrate are 37.60% and 47.20%, respectively. The content of Pb has little effect, but the content of S reduce. It can be seen that a single magnetic separation process does not achieve a good selection index and needs to be used in conjunction with other processes such as re-election.

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April 30, 2023