A beneficiation method for improving the stage grinding and beneficiation index of fine-grained magnetite ore

Abstract

The invention discloses a beneficiation method for improving the stage grinding and separation index of fine grained magnetite. Rough concentrate from secondary magnetic separation is fed to a high-frequency fine screen so as to operate, undersize magnetic separation is performed on undersize parts, and undersize magnetic concentrate is fed to a magnetic separation column so as to perform concentration, so that magnetic separation column concentrate is obtained; oversize parts of the high-frequency fine screen and tailings from the concentration of the magnetic separation column are fed to a concentrated magnetic separator for concentrated magnetic separation, so that concentrated magnetic concentrate is obtained; and three stages of preliminary classification and three stages of grinding are performed on the concentrated magnetic concentrate so as to form a close loop, and the concentrated magnetic concentrate overflows to be fed to magnetic separation for the third time and the fourth time, so that four-time magnetic concentrate is obtained. According to the beneficiation method, oversize products of the fine screen and the tailings of the magnetic separation column in the stage grinding and separation flow which is generally used by a magnetite concentrating mill are separately treated, so that the oversize products and the tailings are not accumulated in a large cycle in the flow, the mFe grade of the tailings is greatly reduced, and the mFe recovery rate of the whole flow is increased. The beneficiation method has the advantages of high iron concentrate grade, high mFe recovery rate, stable index, easiness in site operation and management and the like.

Description

technical field [0001] The invention belongs to the technical field of iron ore beneficiation, and specifically relates to a magnetite ore grinding and stage separation beneficiation method, which is especially suitable for raw ore TFe grades in the range of 30.0% to 35.0% and grinding particle size of -0.043mm Accounting for 75% to 85% of the fine-grained magnetite ore that can be dissociated from the monomer, the stage grinding operation. Background technique [0002] One of the characteristics of my country's iron ore is that the embedded particle size is fine, which requires fine grinding to obtain high-grade concentrate, but at the same time, the embedded particle size is not uniform. After coarse grinding, adopt appropriate sorting methods to throw out part of the tailings and select some qualified concentrates, and regrind and re-select the middle ore, which is called stage grinding and stage sorting process. [0003] According to the characteristics of raw ore, adop...

AI Technical Summary

Problems solved by technology

However, this process still uses a fine screen as a grading device, which cannot overcome the accumulation of large cycles in the main process, and uses a single drum magnetic separator for separation, which affects the technical indicators of separation, which is manifested in the low grade of iron concentrate. Iron recovery is low

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