The main reason of the refractory pyrite cinder, since one useful minerals and gangue minerals with the living body is present in multiple forms of sulfur in iron ore slag; Second pyrite cinder Si, S, Pb, Zn, etc. The content affects the purity of the iron mineral. In order to achieve a higher sorting index, it is necessary to destroy the useful minerals of the pyrite cinder and the gangue minerals. Therefore, the grinding operation is necessary before the sorting; from the analysis results of the table slag screening, it can be seen that the S in the slag is mainly concentrated in the coarse fraction, and the iron is mainly concentrated in the grains of -0.1 to +0.019 mm. In the grade, and the grade of iron is higher, and the content of S is relatively low. Also, the content of Zn and SiO 2 is higher in the level of +0.15 mm. Iron has a lower grade in this class, and the +0.15mm level only accounts for 3.9%. Therefore, the slag is sieved with a 100 mesh sieve, and the content of S and Si is greatly reduced under the condition that the sieved product does not substantially lose Fe.
Table slag screening analysis results
Granular grade | Yield(%) | grade(%) | ||||
Fe | S | Pb | Zn | SiO 2 | ||
+0.28 | 2.38 | 26.20 | 2.66 | 0.75 | 1.21 | 30.34 |
-0.28+0.15 | 1.56 | 28.12 | 1.08 | 0.36 | 1.16 | 38.73 |
-0.15+0.1 | 4.73 | 47.48 | 0.46 | 0.23 | 0.81 | 21.68 |
-0.1+0.074 | 18.42 | 57.59 | 0.40 | 0.22 | 0.59 | 11.43 |
-0.074+0.037 | 37.64 | 60.22 | 0.20 | 0.18 | 0.44 | 8.29 |
-0.037+0.019 | 24.50 | 53.36 | 0.22 | 0.36 | 0.56 | 14.19 |
-0.019+0.010 | 4.99 | 42.04 | 0.41 | 0.79 | 0.79 | 23.00 |
-0.010+0.005 | 0.9 | 37.89 | 0.56 | 0.94 | 1.01 | 25.50 |
-0.005 | 4.84 | 9.34 | 0.20 | 0.42 | 0.26 | 8.35 |
S, SO 2 , SO 3 , etc. generated during the calcination of pyrite slag are adsorbed in the pores of the slag, and salts are formed at high temperatures with the active elements in the slag. This type of sulfur has a certain solubility, and after grinding, the mineral will reach a higher monomer dissociation. If stirred for a certain period of time before sorting, the removal rate of sulfur can be increased by 50% to 60%, and the content of S in the slag is only about 0.35%, mainly to remove soluble sulfate.
Impurities such as Pb and Zn cannot be significantly reduced by simple sieving and washing. To reduce the content of Pb and Zn, further effective measures are needed to remove them.
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