Beneficiation process of lean magnetite ores and production system thereof

A lean magnetite and process technology, applied in the field of lean magnetite beneficiation process and its production system, can solve the problems of equipment wear and large particle size of coarsely crushed products, so as to reduce wear, reduce ore transportation costs, and reduce mining costs. The effect of operating costs

Active Publication Date: 2016-11-16
马钢集团设计研究院有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the large particle size of coarsely crushed products in the beneficiation process of lean magnetite existing in the prior art, it will cause huge wear and tear on various equipment during the process of transpor

Method used

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  • Beneficiation process of lean magnetite ores and production system thereof
  • Beneficiation process of lean magnetite ores and production system thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] The beneficiation process of a kind of poor magnetite of the present embodiment is applied to a certain poor magnetite open-pit mine, the iron grade of raw ore is 18~22%, and iron mineral is mainly magnetite in the ore, and magnetic iron content is about 70% (accounting for total iron content), the operation steps are:

[0043] A. Coarse crushing: In the ore stope 1, the lean magnetite is coarsely crushed in the coarse crusher, and then sieved by the sieving machine after the coarse crushing;

[0044] B. Secondary crushing: In the ore stope 1, the undersieve of step A is directly entered into the secondary crusher for crushing;

[0045] C, magnetic separation: discard the waste rock after directly performing dry magnetic separation on the crushed material of step B in the ore stope 1;

[0046] D. Transfer: the coarse concentrate obtained in the previous step is transported to the fine crushing and sorting operation area of ​​the subsequent mineral processing area 2;

...

Embodiment 2

[0050] A kind of beneficiation process of lean magnetite in this embodiment, the specific steps are basically the same as in embodiment 1, the improvement is that: the oversize in step A is transferred to the coarse crusher for coarse crushing to improve the utilization rate of ore; coarse crushing to a particle size of 0-300mm, so as to facilitate further crushing by the secondary crusher. In step B, the secondary crushing is crushed to a particle size of 0-70mm, so as to facilitate the magnetic separation work of the permanent magnetic dry magnetic separator, greatly reduce the impact of ore on the hopper and silo of the magnetic separator, and reduce the wear of ore on the conveyor belt ; The weak magnetic dry magnetic separation described in step C is completed by a permanent magnetic dry magnetic separator, so as to be able to adapt to the magnetic separation of ores with a maximum particle size of 70mm.

Embodiment 3

[0052] A kind of beneficiation process of lean magnetite in the present embodiment, the specific steps are the same as in embodiment 2, and the improvement is that: the field strength of the permanent magnet dry magnetic separator is 0.3T; in step B, the medium crushing particle size is The content of 40-70mm is 20%, the content of 10-40mm is 55%, and the content of less than 10mm is 25%. It is suitable for lean magnetite ore with a magnetic iron content greater than 70%. The three technical features work together to achieve better magnetic separation effect. To achieve the purpose of improving the grade of rough concentrate in the ore stope.

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Abstract

The invention discloses a beneficiation process of lean magnetite ores and a production system thereof, and belongs to the technical field of beneficiation. The beneficiation process comprises the following steps: coarse crushing, intermediate crushing, magnetic separation and transferring. An intermediate crushing device is placed at the front of an ore stope, coarse crushing, intermediate crushing and dry magnetic separation are directly carried out on the stope, the purpose of 'early throwing and discarding' tailings and waste rock is achieved, the grade of rough concentrates is improved, the conveyance amount of the ores is reduced, the conveyance cost of the ores is also reduced, the service lives of a belt and a funnel lining plate of a magnetic separator are prolonged, and therefore, the operation cost of a mine is reduced effectively. The production system comprises a coarse crusher, a screening machine, an intermediate crusher, the magnetic separator, a belt conveyor I and a belt conveyor II, wherein the coarse crusher, the screening machine, the intermediate crusher and the magnetic separator are successively arrayed according to a production line in the ore stope; the belt conveyor I conveys the tailings and the waste rock to a dumping site after the tailings and the waste rock are separated magnetically; and the belt conveyor II conveys magnetically separated rough concentrates to a follow-up process. An iron ore extraction region is expanded, and for the actual situation that lean iron ores are main iron ores in China, the beneficiation process of the lean magnetite ores and the production system thereof are particularly worthy of being popularized and used.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a mineral processing process of lean magnetite and a production system thereof. Background technique [0002] Energy saving and consumption reduction means saving energy, reducing consumption, and using the least investment to obtain the greatest economic benefits. Energy conservation and consumption reduction has become a basic national policy of our country. Guided by the scientific concept of development, our country is accelerating the development of modern energy industry, adhering to the basic national policy of saving resources and protecting the environment, and placing the construction of a resource-saving and environment-friendly society on the industrialization and modernization The prominent position of the development strategy, strive to enhance the ability of sustainable development, build an innovative country, and continue to make greater co...

Claims

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Application Information

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IPC IPC(8): B02C21/00B03C1/30
CPCB02C21/00B02C23/08B03C1/30
Inventor 朱青山陈孝文方宗龙孙业长陈于海付永胜刘建华胡城袁英杰汪成
Owner 马钢集团设计研究院有限责任公司
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