Regardless of the old plant selection and the new plant selection, the first step is to use the fine sieve to improve the taste of the concentrate. The necessary conditions for the application of fine sieves are: in the concentrate screening, there is a significant grade difference and a certain yield above and below a certain grade. The difference in taste is the separation point to be selected. The greater the grade difference, the more obvious the effect of applying fine screening.

Angang Dagushan processing plant e.g. magnetic iron ore grade of 35.95% +200 mesh - 200 mesh grade of 67.08%, a large difference in quality, it is suitable for fine screen application, it is the point of separation is based on 200 mesh; Bow The Changling Iron Ore Magnetic Separation Concentrate has a grade of 44.97% with a grade of 200 mesh and a grade of 67.85% with a grade of -200 mesh. The grade difference is also very large, which is suitable for fine screening.

Therefore, the application of fine screening is based on the grade difference of magnetite at a certain level of granularity.

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