A relationship between Anshan type iron ore concentrate particle size of the magnetic composition and taste The more accurate method is to use the screening method to draw the relationship between the concentrate size and the cumulative yield and the cumulative grade (cumulated from the fine grade to the coarse grade). The intersection of the cumulative yield and the cumulative grade curve is the separation point. The intersection point of the curve below shows the separation granularity limit of the ore 0.074mm.
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Most of China's magnetites belong to Anshan-type magnetite, and the grade of concentrate has a great relationship with the size of the grain. It is to Dagushan beneficiation plant magnetite concentrate as an example to illustrate this. The iron concentrate grade of the plant is low grade, the grade of +200 mesh is 35.93%, and the grade of -200 mesh is as high as 67.08%, accounting for 80.50% of the total -200 mesh fine-grain grade products. The content of 88.61%, SiO 2 content only accounts for 34.47% of the total silica . In contrast, in the 19.50% +200 mesh coarse-grain product, the iron content only accounts for 11.39% of the total iron content, while the SiO 2 content accounts for the total. The amount of silica is as much as 65.53%, that is, about two-thirds of the silica content is concentrated in one-fifth of the coarse-grained product. It can be seen that the use of fine sieve to improve the grade of iron concentrate, first and foremost, is that in the size analysis of concentrate, there is a significant grade difference above and below a certain grade, and the positive fraction has a yield of 15-30%. rate. The size of the maximum grade difference corresponds to the separation point to be selected. 
B. Relationship between grain size composition and grade of iron concentrate in the Mersby iron ore district, Minnesota, USA. The quality of the Mesabite concentrate +325 mesh grade is 49.2%, while the grade of -325 is 67.6%, with 325 mesh. By separating the separation points, the iron concentrate grade can be significantly improved.