Full-sealing dry-type separation process for fine-sized magnetite

Abstract

The invention discloses a fine-grained magnetite fully-sealed dry-type discarding process, which comprises the following steps: A. Sieving -5mm magnetite powder ore from crushed magnetite ore, drying, crushing After being dispersed, the screw conveyor is sent to the screw dry-type magnetic separator for fully sealed dry pre-selection and discarding operation. The waste disposal rate and grade are controlled by the speed of the screw dry-type magnetic separator. The grade of the dry pre-selection tailings meets the qualified tailings Grade requirements; B. After fully sealed dry pre-selection, the pre-selected tailings are sent to the tailings bin by the screw conveyor, and the pre-selected concentrate is sent to the grinding system by the screw conveyor for processing. The present invention carries out dry waste treatment on ‑5mm magnetite, prevents waste rocks and surrounding rocks from entering the grinding system, prevents ores from being thrown out with waste rocks, reduces the occurrence of subsequent grinding costs, and solves the problem of iron quality. The problem of phyllite and jasper affecting the sorting index; the efficiency of pre-selection is high, the effect of discarding is good, and it can control that the discarded waste rock does not contain iron ore, avoiding the waste of resources.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a fine-grained magnetite fully-sealed dry-type discarding process. Background technique [0002] The dilution rate of magnetite is about 3% in open-pit mining, and about 8% in underground mining, that is to say, the mined ore contains 3-8% of surrounding rock, and the +5mm lump ore uses a magnetic pulley Dry pre-selection can throw out the surrounding rock, while -5mm powder ore adopts magnetic pulley and jigging dry pre-selection can not reach the index of more than 80% discarding rate. First, -5mm fine ore contains about 7% moisture , which affects the dry separation index; second, the difference in specific gravity between the surrounding rock and magnetite is small, and the effect of jigging dry separation is not ideal. Without pre-selection, the surrounding rock will enter the grinding system, which will increase the cost of grinding; forcible pre-sel...

AI Technical Summary

Problems solved by technology

[0002] The dilution rate of magnetite is about 3% in open-pit mining, and about 8% in underground mining, that is to say, the mined ore contains 3-8% of surrounding rock, and the +5mm lump ore uses a magnetic pulley Dry pre-selection can throw out the surrounding rock, while -5mm powder ore adopts magnetic pulley and jigging dry pre-selection can not reach the index of more than 80% discarding rate. First, -5mm fine ore contains about 7% moisture , which affects the dry separation index; second, the difference in specific gravity between the surrounding rock and magnetite is small, and the effect of jigging dry separation is not ideal

Without pre-selection, the surrounding rock will enter the grinding system, which will increase the cost of grinding; forcible pre-selection will cause part of the ore to be thrown out together with the surrounding rock, resulting in waste of resources

At the same time, there are -5mm fine-grained ore magnetic pulleys and the problem of large dust in jigging dry pre-selection

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