A magnetite beneficiation process for improving coarse-grained tailings content and mill processing capacity

Abstract

The invention discloses a magnetite separation technology for increasing the content of coarse-grained tailings and improving the processing capability of a mill. The magnetite separation technology comprises the steps that magnetite is sequentially subjected to first-section ball milling, first-section magnetic separation, first-section classification, second-section magnetic separation, second-section screening, third-section magnetic separation and fourth-section magnetic separation, and iron ore concentrate is obtained; oversize materials obtained through first-section screening of tailings obtained after first-section magnetic separation is taken as building sands; and concentrate obtained through second-section classification, second-section ball milling and fifth-section magnetic separation of oversize materials obtained after second-section screening is fed into second-section classification and overflows in the second-section classification process to be fed into third-sectionmagnetic separation. According to the magnetite separation technology, first-section coarse-grained magnetic separation tailings are screened to obtain tailings with the particle size larger than 0.3mm, therefore, the content of fine-grained tailings is decreased, mining-filling equilibrium is achieved, and the tailings can be taken as the building sand; first-section magnetic separation coarseconcentrate is directly screened and subjected to magnetic separation to obtain qualified iron ore concentrate product in advance, second-section fine-ground invalid ground ore is reduced, and the production efficiency is improved; and magnetic separation tailing discarding is conducted on second-section ball milling discharged ore, the second-section classification feeding capacity and the second-section ball milling sand return capacity are decreased, and the second-section ball milling efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of ore dressing, and relates to a magnetite ore beneficiation process, in particular to a magnetite ore beneficiation process for improving the content of coarse-grained tailings and the processing capacity of a mill. Background technique [0002] The tailings pond is a high potential energy man-made debris flow hazard, and there is a danger of dam failure. Once the accident occurs, it is easy to cause serious accidents. The beneficiation method for the recovery of magnetite resources generally adopts the stage grinding-weak magnetic separation process. Based on the beneficiation principle of early throwing and early throwing, the content of coarse-grained ore in tailings is increased while saving energy and consumption, and the fine-grained tailings are reduced. Quantification, so as to achieve the balance of mining and charging. However, at present, the tailings obtained by conventional magnetite benefici...

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Problems solved by technology

However, at present, the tailings obtained by conventional magnetite beneficiation technology are all fine-grained tailings, and only part of the tailings can be filled underground, and most of the tailings still need to be discharged into the tailings pond, making it difficult to achieve a balance bet

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