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Lean ore two-stage dry magnetic separation and three-stage crushing processing technology

A dry magnetic separation and processing technology, applied in grain processing, etc., can solve the problems of excessive waste of chemicals, waste of production resources, large amount of ore returning sand, etc.

Inactive Publication Date: 2021-05-18
LIAONING INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technology has the following problems: the reverse flotation process uses the cationic collector dodecylamine as the beneficiation agent, and the adjustment of the concentration and flow of the agent needs to match the properties of the ore. Real-time adjustment, but affected by the delay of the processing technology, the speed of chemical preparation cannot keep up with the speed of ore property change, resulting in serious waste of excessive chemical or insufficient chemical ore, resulting in fluctuations in the operation of the beneficiation production process and affecting iron concentrate output and quality, increase production costs, and waste production resources
During the beneficiation process of the magnetic separator, a large number of iron ore concentrate particles will be pushed by the slurry flow to generate great inertia. Since the particle size of the fine-grained ore reaches the micron level and the magnetic force is small, it is difficult to be adsorbed on the magnetic drum. The ore flow is thrown away, resulting in ore with low metal recovery rate, and the tailings of the three-stage magnetic separation process are all discharged, wasting a lot of resources

Method used

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  • Lean ore two-stage dry magnetic separation and three-stage crushing processing technology

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Effect test

Embodiment 1

[0057]The maximum particle size of magnetite is 0.1-0.2mm, the smallest is less than 0.02mm, generally 0.02-0.08mm, the mineral content is generally 20%-40%, the ore crystal particle size is finer, and the selectivity is worse. For this kind of low-grade iron ore, the grinding grade is between 22% and 26%. Two-stage dry magnetic separation and three-stage crushing process are adopted. After crushing, the particle size is <256mm, and it enters the second-stage dry magnetic separation. The high-grade ore is selected and sent to the secondary crusher for crushing. The ore particle size is reduced to <70mm. Screening and screening, the final particle size of the crushed ore product is <12mm, and it is dissociated to a suitable particle size to ensure that the ore entering the grinding reaches a reasonable grade. The two-stage dry magnetic separation and three-stage crushing process is adopted, and the dry magnetic separator is used to improve the ore grade and remove waste rocks. ...

Embodiment 2

[0060] A two-stage dry magnetic separation process for lean ore, the specific steps are as follows.

[0061] The ore with a grade ≥ 24% produced after blasting is transported to the coarse crushing process, and the mixed ore with a grade < 24% is transported to the first stage of the dry-type magnetic separator in the stope for magnetic separation. One-stage dry separation magnetic separator model CTDG1516, (drum diameter×drum length is 1500×1800mm, belt width is 1600mm, belt speed is 1~2.5m / s, the magnetic induction intensity of the drum table sorting area is -600mT, and the separation particle size is 0~350mm , The motor adopts YYF2-280M-655kW380V frequency conversion motor, equipped with frequency converter. After a stage of dry separation, the ore with a grade ≥ 24% is transported to the coarse crushing process to increase the ore output.

[0062] The ore obtained by the above steps enters the coarse crushing operation. After crushing, the ore enters the second-stage dry s...

Embodiment 3

[0066] A two-stage dry magnetic separation and three-stage crushing process for lean ore, the specific steps are as follows.

[0067] The ore with a grade ≥ 24% produced after blasting is transported to the coarse crushing process, and the mixed ore with a grade < 24% is transported to the first stage of the dry-type magnetic separator in the stope for magnetic separation. One-stage dry separation magnetic separator model CTDG1516, drum diameter×drum length 1500×1800mm, belt width 1600mm, belt speed 1~2.5m / s, magnetic induction intensity of drum table sorting area: -600mT, sorting particle size 0~350mm, motor adopts YYF2-280M-655kW380V frequency conversion motor, equipped with frequency converter. After a stage of dry separation, the ore with a grade ≥ 24% is transported to the coarse crushing process to increase the ore output.

[0068] The ore obtained by the above steps enters the coarse crushing operation. After crushing, the ore enters the second-stage dry separation, an...

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Abstract

The invention belongs to the technical field of mineral separation, and particularly relates to a lean ore processing technology capable of increasing yield, guaranteeing quality, saving energy and reducing cost. The technology comprises ore crushing and two-stage dry magnetic separation, and the ore crushing is divided into three procedures of stope mining, coarse crushing and fine crushing; according to the two-stage dry magnetic separation procedure, stope ore-rock mixed ore is mainly selected in the first-stage dry magnetic separation procedure and installed after the stope blasting procedure, and dry magnetic separation waste throwing is conducted on all roughly-crushed ore in the second-stage dry magnetic separation procedure and installed after the rough crushing procedure; and the three-stage crushing comprises coarse crushing, medium crushing and fine crushing, the coarse crushing is performed between the first-stage dry magnetic separation and the second-stage dry magnetic separation, the medium crushing is performed after the second-stage dry magnetic separation, and the fine crushing is performed after the medium crushing. According to the processing technology provided by the invention, the effects of improving the ore quality in the crushing process, increasing the ore grade in the ore grinding process, improving the production efficiency of equipment, reducing abrasion, reducing the production cost and saving energy consumption can be achieved, and the processing technology is particularly suitable for crushing production of magnetite ore with the ore grade of 24-21.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and specifically relates to a two-stage dry magnetic separation and three-stage crushing process for lean ore that improves production, maintains quality, saves energy and reduces costs. Equipment production efficiency reduces wear, reduces production costs, and saves energy consumption. It is especially suitable for the crushing production of magnetite ore with an ore grade between 24 and 21. Background technique [0002] China is one of the countries with relatively rich iron ore resources in the world. There are many types of iron ore origin and complex metallogenic conditions. Although there are many proven reserves, there are many medium and small deposits and few super large deposits; there are many lean ores and few rich ones. ; There are many associated components and poor dressing and smelting conditions. The proven reserves of iron ore resources in Liaoning Province exceed 10...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B02C21/00B02C23/08
CPCB02C21/00B02C23/08
Inventor 刘研宋万强
Owner LIAONING INST OF SCI & TECH
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