Extremely lean magnetite beneficiating process

Abstract

The invention relates to the technical field of ore beneficiation, and in particular relates to an extremely lean magnetite beneficiating process. The process is characterized by comprising the following steps of: 1) carrying out wet pre-beneficiation on raw ores with grain sizes being 0-5mm and concentration being 35-45%; 2) processing the concentrates obtained through wet pre-beneficiation with a primary closed-circuit milling system formed by primary ball milling and primary classifying and discarding the tailings obtained through wet pre-beneficiation; 3) carrying out first-stage magnetic separation on overflow obtained through primary classifying; 4) processing the concentrates obtained through first-stage magnetic separation with a secondary closed-circuit milling system formed by secondary ball milling and secondary classifying; 5) carrying out second-stage magnetic separation on overflow obtained through secondary classifying; 6) carrying out third-stage magnetic separation on concentrates obtained through second-stage magnetic separation; 7) taking the concentrates obtained through third-stage magnetic separation as the final concentrates with grades being 63-64%; and 8) discarding the final tailings formed by the tailings obtained through first-stage magnetic separation, second-stage magnetic separation and third-stage magnetic separation. The process has the following characteristics that: 30% of tailings are discarded by adopting the pre-beneficiation method, thus improving the beneficiation feed grade of the ores to 16-18%, reducing the quantity of the ores entering the ball mill by 30% and obviously lowering the ore beneficiation cost; and the energy is saved and the economic benefits are obvious.

Description

technical field [0001] The invention relates to the technical field of ore dressing, in particular to a sorting process of extremely lean magnetite. Background technique [0002] Very lean magnetite ore is usually sorted by the method of "stage grinding, single magnetic separation". The sorting process is as follows: [0003] The extremely lean magnetite ore goes through a stage of closed-circuit grinding until the particle size is -200 mesh and the content is 50-60%. After a stage of magnetic separation, about 40% of the coarse-grained tailings are thrown away. After the coarse concentrate is subjected to secondary grinding, the particle size reaches -200 mesh content of more than 85%, and then through the first stage of dewatering tank and two-stage magnetic separator separation, iron concentrate can be obtained. The first, second, and third-stage magnetic separation tailings are combined with the first-stage dewatering tank tailings to form the final tailings . The ...

AI Technical Summary

Problems solved by technology

The disadvantage of this process is that the large-grained poor conjoined organisms and gangue minerals are thrown away after grinding and one-stage magnetic separation, which increases the amount of grinding once, the amount of ore fed by one-stage magnetic separation increases, and the number of separation machines increase, resulting in higher beneficiation costs

[0007] Before the extremely lean magnetite is selected, dry magnetic separation is also used for separation. The separation particle size is generally 12-0mm. Since dry magnetic separation does not have the effect of dispersing water in the bottom box of the magnetic separator, iron minerals The uneven dispersion of the gangue minerals and the uneven thickness of the ore feed layer make some iron minerals enter the tailings, and the gangues are also wrapped into the concentrate, the separation effect is not ideal, the concentrate grade is low, and the tailings The ore grade is high, the tailings yield is only 15-20%, and the tailings grade is above 9%. On the other hand, the dry magnetic separation has a lot of dust, which affects the environment, and the effect of low-carbon environmental protection is poor

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