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Mineral processing technology of ultra-low-grade iron ore

A lean iron ore and process technology, applied in the field of ultra-lean iron ore beneficiation technology, can solve the problems of high particle size requirements for raw ore selection, increased beneficiation costs, and low tailing yield, so as to reduce the energy consumption of ore beneficiation, reduce Cost, the effect of reducing the amount of grinding

Pending Publication Date: 2022-04-08
YUXI DAHONGSHAN MINING
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0003] At present, the existing technology for the beneficiation process of ultra-lean ore mainly produces medium ore with an iron grade of 24.68% after sorting mineral tailings, weak magnetic field, strong magnetic field, shaking table, etc., and this part of medium ore still needs Further sorting will naturally increase the cost of beneficiation
In addition, there are still problems in the existing technology, such as high requirements on the particle size of raw ore, low yield of tailings, and tailings not up to standard.

Method used

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  • Mineral processing technology of ultra-low-grade iron ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The ultra-lean iron ore sample of Kunming Iron and Steel Dahongshan Concentrator with an iron grade of 14.54%, a magnetic iron content of 5.78%, and an occupancy rate of 39.75% was crushed to -3mm in three stages, and the surface magnetic field strength of the cylinder was 600mT. , The dry magnetic separator with a drum line speed of 1.12m / s performs dry pre-selection and discards waste to obtain dry-throwing concentrate with a grade of 16.48% and dry-throwing tailings with a grade of 11.44%; grind the dry-separated concentrate to -200 mesh The ore pulp accounts for 76.92%, and the induction intensity of the pulp is 100mT. The model is XCRS-74 drum-shaped wet weak magnetic separator for a stage of weak magnetic separation to obtain a stage of weak magnetic concentrate with a grade of 43.78% and a stage of grade of 9.94%. The weak magnetic tailings of the first stage are ground to -325 mesh and the proportion is 81.36%, and then the second stage weak magnetic concentrate ...

Embodiment 2

[0035] The ultra-lean iron ore sample with an iron grade of 20.21% and a magnetic iron content of 5.78% in the Dahongshan Concentrator of Kunming Iron and Steel Co., Ltd. was crushed to -3mm in three stages. s dry-type magnetic separator performs dry pre-selection and discards waste to obtain dry-throwing concentrate with a grade of 16.48% and dry-throwing tailings with a grade of 11.10%; grind the dry-separated concentrate to -200 mesh and account for 80.31% of the slurry , the induction intensity of the ore pulp is 100mT, and the model is XCRS-74 drum-shaped wet weak magnetic separator for a section of weak magnetic separation to obtain a section of weak magnetic concentrate with a grade of 45.40% and a section of weak magnetic tailings with a grade of 9.31%; The first-stage weak magnetic concentrate is ground to -325 mesh, accounting for 82.51%, and then the second-stage weak magnetic concentrate is obtained by the second-stage weak magnetic separation with a grade of 53.62%...

Embodiment 3

[0037] The ultra-lean iron ore sample with an iron grade of 23.51% and a magnetic iron content of 6.13% in the Dahongshan Concentrator of Kunming Iron and Steel Co., Ltd. was crushed to -3mm in three stages. / s dry-type magnetic separator for dry pre-selection and discarding to obtain dry-throwing concentrate with a grade of 16.83% and dry-throwing tailings with a grade of 10.86%; grind the dry-separated concentrate to -200 mesh, accounting for 81.63% Ore pulp, the ore slurry is subjected to a weak magnetic separation by a wet weak magnetic separator with an induction intensity of 200mT to obtain a weak magnetic concentrate with a grade of 45.88% and a weak magnetic tailing with a grade of 9.25%; grind a weak magnetic concentrate to - The 325 mesh accounted for 82.29%, and then the second-stage weak magnetic concentrate was obtained through the second-stage weak magnetic separation with a grade of 53.17%. 64.92%; a section of weak magnetic tailings is separated by a shaking ta...

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Abstract

The mineral processing technology specifically comprises the following steps that after raw ore is subjected to three-section crushing to obtain an ore sample with the particle size of-3mm, a dry magnetic separator is adopted for pre-concentration and waste throwing, and dry-thrown concentrate and dry-thrown tailings with the grade smaller than or equal to 12% are obtained; grinding the dry-separated concentrate to-200-mesh mineral powder or ore pulp, and then carrying out first-stage low-intensity magnetic separation to obtain first-stage low-intensity magnetic concentrate and first-stage low-intensity magnetic tailings; grinding the first-section low-intensity magnetic concentrate to-325 meshes, and performing second-section low-intensity magnetic separation and third-section low-intensity magnetic separation to obtain concentrate; the first-section weak magnetic tailings are subjected to table separation to obtain middlings and table tailings; and the second-section weak magnetic tailings, the third-section weak magnetic tailings, the table tailings and the dry throwing tailings are combined to obtain total tailings. According to the process, ultra-lean ore resources are utilized, meanwhile, the overall sorting cost of the part is reduced, generated tailings can be sold, economic benefits are increased, meanwhile, the part of tailings entering a tailing pond is reduced, and the cost of the tailing pond is reduced.

Description

technical field [0001] The invention belongs to the technical field of iron ore beneficiation, and in particular relates to a beneficiation process of ultra-lean iron ore. Background technique [0002] In terms of iron ore grade classification, iron grades above 50% are high-grade ores, 35% to 50% are low-grade ores, 25% to 35% are lean ores, and iron grades below 25% are ultra-lean ores. About 97% of iron ore reserves in my country have a grade lower than 35%, which belongs to lean ore or ultra-lean ore. Since 2018, the price of iron ore has gradually recovered, and the ultra-poor iron ore with low economic benefits has become valuable for separation. In addition, the particle size of gangue minerals in the ore is larger than that of magnetite minerals. After crushing, magnetic separation can be discarded Part of the gangue reduces the load of follow-up operations. And because the grinding cost accounts for about 50% of the cost of iron ore beneficiation, so as long as th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B7/00B03C1/02B03C1/30
Inventor 焦栋温海滨臧超雷邓琴宫卓李忠仙普绍云王珏淦杨睿宇
Owner YUXI DAHONGSHAN MINING
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