Beneficiation method for efficiently recycling low-grade copper-bearing lava magnetite

Abstract

The invention discloses a beneficiation method for efficiently recycling low-grade copper-bearing lava magnetite. The beneficiation method comprises the following steps: smashing; grinding and performing spiral grading on smashed ores; enabling graded fine ores to be subjected to medium-strong magnetic separation, so as to obtain crude iron ores and tailings; performing rotational flow grading on the crude iron ores, so as to obtain fine ores and crude ores; enabling the fine ores to be subjected to series-connected 2-3 sections of low intensity magnetic separation, so as to obtain fine iron ores I and tailings I; enabling the crude ores to be subjected to second-stage grinding and spiral grading, enabling the fine ores to be subjected to rotational flow grading, and returning the crude ores to the second-stage grinding; stirring and mixing the tailings with medium-strong magnetic property and a chemical, and performing primary flotation, so as to obtain crude copper ores and tailings; enabling the crude copper ores to be subjected to series-connected 2-3 sections of fine separation and precipitation, so as to finally obtain fine copper ores; performing strong magnetic separation on tailings obtained after primary flotation, so as to obtain crude iron ores and tailings II; performing shaking table scavenging on the crude iron ores, so as to obtain fine iron ores II and tailings III. According to the invention, the ore grinding amount is less, the mineral monomer separation is sufficient, the resource recovery capability is strong, and the ore concentrate grade is high.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a mineral processing method for efficiently recovering low-grade copper-containing lava magnetite with less grinding amount, strong resource recovery capability and high concentrate grade. Background technique [0002] Low-grade copper-bearing lava magnetite is an ultra-lean ore because the TFe grade in the ore is generally lower than 20%, which not only has high beneficiation costs and low iron concentrate grade, but also has the harmful effect of "hot brittleness" caused by copper during heating. Therefore, necessary beneficiation treatment must be carried out on the copper contained in the ore to comprehensively recover iron and copper metal resources. Therefore, beneficiation is difficult and costly. [0003] For example, the copper-bearing lava magnetite in the shallow part of Dahongshan, Yunnan Province has low iron content, the grade of raw ore iron...

AI Technical Summary

Problems solved by technology

[0004] At present, the following technical problems exist in the utilization of ultra-lean iron ore with an iron grade of less than 20% in the raw ore: (1) The iron grade of the ore is extremely low, the surrounding rock near the mine has a gradual relationship with the ore, and the boundary between the ore and the surrounding rock is unclear. Using the current mature large-block dry magnetic separation tailing or large-block jigging technology, the grade of the selected ore is generally only increased by 2 percentage points, and at the same time, the amount of tailings is very small and the loss of iron metal is very large.

[0005] (2) It is difficult to control the ore loss rate and waste rock mixing rate during the mining process, which makes it difficult to control the grade of the selected ore

In addition, there is a large amount of off-surface ore resources. If the off-surface ore is discarded, the dump site will be occupied, which will affect environmental protection; if the off-surface ore is recovered, the grade of the mined ore will be reduced, which will greatly affect the grade of ore concentrate and metal recovery rate.

[0006] (3) Due to the low iron grade of the ore, relatively difficult grinding and separation, and large beneficiation ratio, if the conventional beneficiation technology is used to process it, it will result in high concentrate costs and poor economic benefits or losses in the mine

[0007] (4) Due to the limitation of the separation principle of dry magnetic separation equipment, the tailing effect of dry magnetic separation for finer ore is poor, and there is no mature high-efficiency wet magnetic separation equipment suitable for tailing of finely crushed products.

Therefore, there is no effective beneficiation method for ultra-lean iron ore, especially low-grade copper-bearing lava magnetite.

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