How To Improve The Grade Of Concentrate Fines

Mineral classification of methods, many of which spiral classifier is the most primitive of the grading equipment

. 1, the final product particle size in the requirement of iron ore concentrate negative 80m sieve reached 100%, the first paragraph of the classification can be spiral classifier; Sec classification using high frequency fine sieve. 2, if the requirements of the final product of the iron ore powder granularity negative 80m content of less than 100%, the large particles, mineral particles is relatively small proportion of serious wear and tear of high-frequency screen sieve under the premise can be used frequency vibration grading sieve, sieve in the mine magnetic separation; crude ore on the screen and return to the mill regrinding. There is also a grading equipment hydro cyclone. There are more large-scale concentrator, removed some, spiral classifier, Sec mill equipment, switch to the hydro cyclone. This method is not only played a classification on the thickness of the ore, and also enhances the concentration of the slurry to reduce the magnetic separation before dewatering equipment. The device can also check the pulp before in the non-magnetic ore grading concentrated and played a good effect.

According to the survey that of the stakeholders: the concentrator after the fine grinding of slag directly into the magnetic separator magnetic separator. Milling of the ore is nonmagnetic separation directly after grading, the results of the ore granularity uneven thickness. Coarse ore grade is low; too small and the ore grade is high, but the low magnetic field strength, the adsorption capacity. With the water flow into the tailings, low grade iron ore powder, run tail is serious.

After grinding the material must be after grading, screening, and then magnetic separation. Ore, it is a different grade of the highest monomer dissociation granularity. Granularity is too coarse, the separation of impurities in the ore out, there will be ore grade is too low; If the granularity of grinding too small, the main waste mill grinding and grinding time. Because the ore particle size less than 10m in ore per 1% increase in grinding time should increase by 2%, power consumption and ball liner wear, a corresponding increase of 2%; therefore, do everything possible to reduce the grinding of mineral content is to increase the mill output, reduce power consumption to improve the recovery of the most effective method of iron powder. Using packet screening measures, the mineral particle size less than the requirements back to the mill for re-grinding, the particle size to achieve the required mineral timely sent to selected points, both to improve the concentrate grade, improve mill grinding mine efficiency.

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