The pyrite cinder (dry mine) is sieved through a 100 mesh sieve, and the sieved product is ground in a rod mill for 5 min, the grinding concentration is C=70%, stirred for 5-8 minutes, and then subjected to two-stage magnetic separation. The magnetic field strength is 2500 ohms and 3000 ohms respectively. A section of magnetic separation concentrate and two-stage magnetic separation concentrate are combined into the final concentrate. The second-stage magnetic separation tailings are re-selected by spiral chute to obtain the middle mine and tail. mine. The process flow is shown in Figure 1:

Figure 1 Two-stage magnetic separation - spiral chute process flow chart

See the table below for the results.

Table 2 magnetic separation - spiral chute test

product name

Yield

(%)

grade(%)

Recovery rate(%)

Fe

S

Fe

S

Concentrate I

25.16

63.68

0.236

31.53

3.41

Concentrate II

38.30

61.77

0.196

46.55

4.31

Tailings

36.54

30.48

4.91

21.92

92.28

total

100

50.82

1.74

100

100

The results in the table show, the sulfur in the iron ore slag pretreated under the same conditions, with a two-stage magnetic separation - can be ideal spiral chute sorting index joint process. The obtained concentrate grades are relatively high, 63.68% and 61.77%, respectively. The cumulative yield of concentrate I+ concentrate II is 63.46%, and the cumulative recovery rate is 78.08%. The content of S can also be reduced to less than 0.3%.

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