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High-voltage electric pulse selective pulverizing and pre-enriching method for lean hematite ores

A high-voltage electric pulse and pre-enrichment technology, applied in chemical instruments and methods, solid separation, filtration, etc., can solve the problem of poor hematite pre-enrichment without considering the ore crushing process, poor selective dissociation effect of ore It is difficult to further improve the set index and achieve the effect of increasing the dissociation degree of the monomer, benefiting energy consumption and saving energy consumption

Active Publication Date: 2017-07-28
NORTHEASTERN UNIV
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Problems solved by technology

However, in the existing pre-enrichment process, the ore is crushed using a crusher, and due to the limitation of the working principle, the selective dissociation effect of the crusher on the ore is poor, which is the root cause of the difficulty in further improving the pre-enrichment index of lean hematite
However, the existing pre-enrichment work only focuses on the optimization of pre-selection parameters and the development of strong magnetic equipment, without considering the crushing process of ore
Therefore, the high-efficiency dissociation pre-enrichment technology for lean hematite ore remains to be developed

Method used

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Embodiment 1

[0033] Use lean hematite ore with an iron grade of 20%;

[0034] The ore is roughly crushed to a particle size of -30mm by a jaw crusher;

[0035] Under the conditions of voltage 150kV, frequency 5Hz, and electrode spacing 25mm, the coarsely crushed material with a particle size of -30mm is crushed to a particle size of -5mm by a high-voltage pulse crusher;

[0036] Use a sieve with a sieve hole of 0.5mm to sieve the -5mm electric pulverized material into -5 ~ +0.5mm particle size material and -0.5mm particle size material;

[0037] The material with a particle size of -5 ~ +0.5mm is subjected to dry strong magnetic separation through a roller permanent magnet strong magnetic separator with a magnetic field strength of 950kA / m to obtain pre-enriched concentrate I and tailings I;

[0038] The material with a particle size of -0.5mm is subjected to wet strong magnetic separation through a vertical ring strong magnetic separator with a magnetic field strength of 400kA / m to obtai...

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Abstract

The invention discloses a high-voltage electric pulse selective pulverizing and pre-enriching method for lean hematite ores. The method is characterized in that high-voltage electric pulse pulverizing pretreatment is realized by utilizing dielectric property difference of different minerals in ores, energy with extremely high power density is output by high-voltage pulses, and the energy is discharged onto the lean hematite ores through a high-voltage electrode; valuable mineral hematite, gangue mineral quartz and the like in the ores form a plurality of micro cracks among interfaces, so that selective dissociation for hematite and gangue minerals is realized; and pre-enriched concentrate is obtained through strong magnetic separation. The method improves beneficiation feed grade of the ores, and is beneficial for improving follow-up grading and sorting indexes.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a high-voltage electric pulse selective pulverization pre-enrichment method for lean hematite ore. Background technique [0002] Poor hematite ore is an important iron ore resource in China, mainly distributed in Liaoning, Hebei, Anhui, Gansu, Inner Mongolia, Henan, Hubei, Shanxi, Guizhou and other places. At present, my country's lean hematite ore is usually processed by "stage grinding-strong magnetic separation-anion reverse flotation process", which produces iron concentrate with a product grade of about 65% and a recovery rate of about 70%. However, due to the low grade of this kind of ore (generally less than 30%), complex mineral composition and fine crystal grain size, the cost of beneficiation is relatively high, which is 50% higher than the cost of magnetite beneficiation on average. [0003] Pre-enrichment technology can remove a large amount of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B02C19/18B02C21/00B02C23/14B07B1/28B07B1/42
CPCB02C19/18B02C21/00B02C23/14B02C2019/183B07B1/28B07B1/42
Inventor 孙永升韩跃新高鹏李艳军袁帅李宏达
Owner NORTHEASTERN UNIV
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