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Absolutely-dry type sorting method for iron ores

A fully dry and dry magnetic separation technology, applied in chemical instruments and methods, wet separation, solid separation, etc., can solve the problems of underutilized tailings, high dry grinding capacity, and increased processing capacity. To achieve the effect of reducing equipment maintenance and processing costs, reducing processing pressure, and reducing processing capacity

Active Publication Date: 2019-12-20
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method only carries out a stage of pre-selection, which makes the amount of dry grinding relatively high, and the ore dressing process does not carry out rough selection, and is directly selected by a flat-plate wind-magnetic combined dry separator, which increases the subsequent processing capacity, and the final tailings of this method are not used. be used effectively

Method used

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  • Absolutely-dry type sorting method for iron ores
  • Absolutely-dry type sorting method for iron ores

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Such as figure 1 As shown, the invention discloses a kind of iron ore full-dry sorting method, the equipment adopted is such as figure 2 As shown, it includes a first magnetic pulley 1, a high pressure roller mill 2, a round roller screen 3, a first single magnetic field spiral dry magnetic separator 4, a vertical dry mill 5, a double magnetic field spiral dry magnetic separator 6, Belt-type air-magnetic dry separator 7, the second magnetic pulley 8, the second single magnetic field spiral dry magnetic separator 9, the iron ore full-dry sorting method includes the following steps:

[0043] Step 1: coarsely crush and screen the iron-containing raw ore, pass the material on the sieve through a stage of intermediate crushing, and then pass the first magnetic pulley 1 together with the material under the sieve for dry pre-selection;

[0044] Step 2, sending the concentrated ore after the dry pre-selection by the first magnetic pulley 1 into the high-pressure roller mill 2...

Embodiment 2

[0059] The iron content of the iron ore used is 31.20%, the iron-containing minerals are mainly magnetite, limonite and hematite, and the particle size of the raw ore is >50mm.

[0060] An iron ore full-dry sorting method, the specific implementation steps are as follows:

[0061] 1. The raw iron ore is roughly broken, screened, and medium crushed until the particle size reaches -20mm, and it is pre-selected by the first magnetic pulley 1 with a magnetic field strength of 3800Gs, and the iron content of the sand aggregate removed is 9.23 %, the yield is 18.24%.

[0062] 2. After the pre-selected concentrate is passed through the high-pressure roller mill, it passes through the round roller screen 3 with a distance between the rollers of 6mm, and the product on the screen is pre-selected by the second magnetic pulley 8 with a magnetic field strength of 3400Gs. The iron content of the sand and stone aggregate removed is 7.32%, the yield is 4.31%, the second magnetic pulley 8 pr...

Embodiment 3

[0066] The iron content of the iron ore used is 33.27%, the iron-containing minerals are mainly magnetite, specularite and hematite, and the particle size of the raw ore is >50mm.

[0067] An iron ore full-dry sorting method, the specific implementation steps are as follows:

[0068] 1. The raw iron ore is roughly broken, screened, and medium crushed until the particle size reaches -25mm, and it is pre-selected by the first magnetic pulley 1 with a magnetic field strength of 3700Gs, and the iron content of the sand aggregate removed is 11.23 %, the yield is 16.24%.

[0069] 2. After the pre-selected concentrate is passed through the high-pressure roller mill, it passes through the round roller screen 3 with a distance between the rollers of 8mm, and the product on the screen is pre-selected by the second magnetic pulley 8 with a magnetic field strength of 3500Gs. The iron content of the sand and gravel aggregate thrown away is 7.79%, the yield rate is 7.44%, the second magnet...

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Abstract

The invention discloses an absolutely-dry type sorting method for iron ores. The absolutely-dry type sorting method comprises the following steps: roughly breaking and screening iron-containing raw ores, enabling oversize products and undersize products to perform magnetic slide wheel dry type pre-sorting after the oversize products are subjected to intermediate crushing, performing high-pressureroller grinding on pre-sorted concentrate, and taking pre-sorted tailings as sand aggregates; dispersing the roller-grinded pre-sorted concentrate and then screening the roller-grinded pre-sorted concentrate through a round roller screen, performing one-section magnetic slide wheel dry type pre-sorting on the oversize products, returning the pre-sorted concentrate to a feeding end of a high-pressure roller mill, and taking the pre-sorted tailings as sand aggregates; adopting spiral dry type pre-sorting for undersize products of the round roller screen, taking the spiral dry-type pre-sorted tailings as rough tailings, and adding the pre-sorted concentrate into a hot air vertical type drill mill; roughly sorting dry-milled products through a dual-magnetic-field spiral dry type magnetic sorting machine, performing two-section belt type wind magnetic selection on roughly-sorted middlings, and finally forming comprehensive concentrate by the belt type wind magnetic concentrate and roughly-sorted concentrate. The absolutely-dry type sorting method for iron ores adopts an absolutely-dry type ore dressing process, is simple in process, is low in water consumption, is high in tailings building materializing utilization rate, and does not need a tailings dam.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, relates to engineering ore dressing, and in particular to a fully dry sorting method for iron ore. Background technique [0002] my country's iron ore resources have low raw ore grade, fine ore embedded particle size, and many gangue mineral inclusions. At present, for the separation of iron ore, it is often necessary to crush the ore, tube-type ball mill until the particle size is less than 0.074mm, accounting for more than 60%, and then separate the iron ore through gravity separation, wet magnetic separation, flotation and other wet separation methods concentrate. [0003] The main problems in the existing technology are as follows: the current wet method consumes a lot of steel and water in crushing and grinding. On average, 0.8-1.5kg of steel balls and liners are needed to process each ton of ore. Ore needs to consume nearly 3 tons of water, which is a great problem for iron ore...

Claims

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Application Information

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IPC IPC(8): B03B7/00B03B9/00
CPCB03B7/00B03B9/00
Inventor 陈铁军刘伟周仙霖万军营罗艳红
Owner WUHAN UNIV OF SCI & TECH
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