Dry-grinding and dry-separation method of magnetite

A dry separation method and magnetite technology, applied in chemical instruments and methods, solid separation, separating solids from solids with air flow, etc., can solve high tailings disposal costs, high steel consumption of ball mills, and huge maintenance costs and other problems, to achieve the effect of saving money, occupying a small area, and low production cost

Active Publication Date: 2011-11-16
CHENGDU LEEJUN IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: (1) The power consumption of the ball mill is high, and an average of 15-20 kilowatt-hours of electricity is required to process each ton of ore; (2) The steel consumption of the ball mill is high, and steel balls and liners are required to process each ton of ore 0.8-1.5kg, (3) During production, a large amount of water is required after the ball milling section, and an average of 3 tons of water is required to process 1 ton of raw ore. (4) Tailings need to be disch...

Method used

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  • Dry-grinding and dry-separation method of magnetite

Examples

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Embodiment 1

[0021] Embodiment 1: as Figure 2-3 As shown, a certain thalassemia magnetite in Inner Mongolia has a total iron content of 11.5% and a magnetic iron content of 6.8%. The crusher is medium crushed, the ore discharge port of the cone crusher is controlled at 20mm, and the material under the screen and the medium crushed product are sent to the high pressure roller mill by the belt. The products of the high-pressure roller mill are sent to the dispersing and classifying machine through the hoist for treatment. The rotor speed is controlled to 300r / min, the fan speed is 1200r / min, and the angle adjustment plate is 20° to obtain +3mm coarse grains, -3+0.2mm fine grains and -Three grades of fine powder of 0.2mm, the coarse-grained product returns to the high-pressure roller mill through the hoist, and the fine-grained product passes through the dry magnetic separator with a magnetic field strength of 1200Gs, and about 30% of the fine-grained tailings are thrown away. The final con...

Embodiment 2

[0022] Embodiment 2: as Figure 2-3 As shown, a certain thalassemia magnetite in Xinjiang has a total iron content of 18.6% and a magnetic iron content of 15.3%. The crusher is crushed, and the ore discharge port of the cone crusher is controlled at 30mm. The under-screen material and the crushed product are fed into the high-pressure roller mill by the belt. The products of the high-pressure roller mill are fed into the elevator, and after being processed by the dispersing classifier, the rotor speed is controlled to 350r / min, the fan speed is 1500r / min, and the angle adjustment plate is 15° to obtain +5mm coarse grains and -5+0.5mm fine grains. Granular and -0.5mm fine powder three grades of products, the coarse product returns to the high-pressure roller mill through the elevator, the fine product passes through the dry magnetic separator, the magnetic field strength is 1800Gs, and about 40% of the fine tailings are thrown away. After the tailings are thrown, the concentra...

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Abstract

The invention discloses a dry-grinding and dry-separation method of magnetite, which comprises the following steps of: feeding the crude ore of magnetite into a crusher for coarse crushing, and then feeding the crushed magnetite into a vibrating sieve for sieving; controlling the sieve meshes within a range of 35-75 mm; feeding the oversize product to the crusher for intermediate crushing and then feeding the crushed oversize product into a high-pressure roller mill along with the undersize product for fine crushing; breaking and grading the fine-crushed ore by a breaking-grading machine, thereby obtaining the products of three grain grades, i.e. coarse grains, fine grains and fine powder; returning the coarse-grain grade product to the high-pressure roller mill through an elevator, and feeding the fine-grain grade product to a dry type magnetic separator for magnetic separation and discarding tailings, wherein the magnetic field intensity is controlled within a range of 1200-3000 Gs; directly dryly stacking the discarded fine-grain grade tailings, and returning the fine-grain grade concentrate to the high-pressure roller mill through a belt conveyor and the elevator to form a closed loop; and feeding the fine-powder grade product into a cyclone magnetic separator, wherein the magnetic field intensity is controlled within a range of 600-1200 Gs, thereby obtaining concentrate or semi-concentrate. The dry-grinding and dry-separation method is low in power consumption, steel consumption and water consumption, and the tailings are easy to be disposed of.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a magnetite dry grinding and dry separation method. Background technique [0002] At present, the magnetite beneficiation production process is a stage grinding-stage separation process, which mainly includes four stages: crushing, ore grinding, magnetic separation, and product treatment. After the raw ore is dry crushed by a gyratory crusher or a jaw crusher, the particle size is reduced to 300-350mm, and then after being dry crushed by a standard cone crusher, the particle size is reduced to 70-100mm. The material passes through a vibrating screen, and the material under the screen enters the powder The ore bin is temporarily stored, and the material on the screen enters the short-head cone crusher for fine crushing, and the product is returned to the vibrating screen by a belt conveyor, forming a closed circuit. The material under the screen in the powd...

Claims

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Application Information

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IPC IPC(8): B02C21/00B07B15/00B07B7/083
Inventor 何亚民魏勇徐智平
Owner CHENGDU LEEJUN IND
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