A kind of fully dry sorting method for iron ore

A fully dry and dry magnetic separation technology, applied in chemical instruments and methods, wet separation, solid separation, etc., can solve the problems of increased processing capacity, high dry grinding capacity, and ineffective use of tailings. Achieve the effects of reducing processing pressure, increasing recovery rate, reducing equipment maintenance and processing costs

Active Publication Date: 2021-04-23
WUHAN UNIV OF SCI & TECH
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

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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  • A kind of fully dry sorting method for iron ore
  • A kind of fully dry sorting method for iron ore

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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 iron ore full-dry sorting method, which comprises the following steps: coarsely crushing and screening iron-containing raw ore, performing intermediate crushing on the product on the screen, and performing dry pre-selection with a magnetic pulley together with the product under the screen , the pre-selected concentrate is then subjected to high-pressure roller milling, and the pre-selected tailings are used as sand and gravel aggregates; the pre-selected ore after roller milling is broken up and then screened through a round roller sieve, and the product on the screen is subjected to a magnetic pulley dry pre-selection, pre-selected The concentrate returns to the feeding end of the high-pressure roller mill, and the pre-selected tailings are also used as sand and gravel aggregates; the products under the round roller screen are pre-selected by spiral dry type, and the spiral dry pre-selected tailings are used as coarse tailings, and the pre-selected concentrate enters the heating air In the vertical dry mill; after dry grinding, the product is roughed with a double-magnetic field spiral dry magnetic separator, and the rough beneficiation is subjected to two-stage belt-type magnetic separation, and the final belt-type wind-magnetic concentrate is composed of the rougher concentrate Comprehensive Concentrate. The invention adopts an all-dry beneficiation process, has simple process, low water consumption, high utilization rate of tailings building materials, and no 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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Patent Type & Authority Patents(China)
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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