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A method for selective pulverization and pre-enrichment of lean hematite ore by high-voltage electric pulse

A high-voltage electrical pulse, pre-enrichment technology, applied in chemical instruments and methods, solid separation, grain processing, etc. It is difficult to further improve the set index and other problems, so as to improve the degree of dissociation of monomers, which is beneficial to energy consumption and saves energy consumption.

Active Publication Date: 2019-05-21
NORTHEASTERN UNIV LIAONING
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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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  • A method for selective pulverization and pre-enrichment of lean hematite ore by high-voltage electric pulse
  • A method for selective pulverization and pre-enrichment of lean hematite ore by high-voltage electric pulse

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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 method for selective crushing and pre-enrichment of lean hematite ore by high-voltage electric pulse. This method utilizes the difference in dielectric properties of different minerals in the ore to achieve high-voltage electric pulse crushing pretreatment. The high-voltage pulse outputs extremely high power density energy and is discharged onto the poor hematite ore through the high-voltage electrode. The useful mineral hematite in the ore is Iron ore and gangue minerals such as quartz form many micro-cracks at the interface to achieve selective dissociation of hematite and gangue minerals, and then obtain pre-enriched concentrate through strong magnetic separation to improve the selection grade of the ore, which is beneficial to Improve subsequent selection and sorting indicators.

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 Patents(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 LIAONING
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