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Dry beneficiation process for extracting iron ore concentrates from extremely lean sand iron ore

A technology for iron concentrate and iron ore, which is applied in the field of dry beneficiation technology for extracting iron concentrate, can solve the problems of low ore yield, complicated process and high investment, and achieves low development cost, reduced processing capacity and fine particle size. Effect

Inactive Publication Date: 2017-07-14
JIUQUAN IRON & STEEL GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the current method of extracting iron ore concentrate from extremely lean sand iron ore is too complex in process, high in investment, and low in ore yield. The separation equipment used is a wet magnetic separator. During use, it needs to consume A large amount of water, for the water-scarce areas in Northwest China, this method becomes the bottleneck of enterprise development

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  • Dry beneficiation process for extracting iron ore concentrates from extremely lean sand iron ore

Examples

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Effect test

Embodiment 1

[0023] Take the beneficiation of an iron sand ore containing 6.88% magnetic iron in a sandy loose accumulation in China as an example.

[0024] use as figure 1 The shown dry beneficiation process for extracting iron concentrate from extremely lean sand iron ore has the following process steps:

[0025] (1) Screening and removing impurities of iron placer ore: feed iron placer ore into a vibrating screen with a sieve hole size of 3mm to obtain lump ore containing impurities on the sieve and fine ore under the sieve;

[0026] (2) Dry pre-selection: feed the fine ore obtained in step (1) into a dry-type magnetic separator with a magnetic field strength of 0.2t and a drum line speed of 0.6m / s for magnetic separation to obtain medium ore products and weak magnetic or non-magnetic For tailings products, the ore grade is increased to 16.12%, the yield is 18.71%, the iron recovery rate is 43.86%, and 81.29% of the weakly magnetic or non-magnetic tailing waste sand is discarded, and t...

Embodiment 2

[0030] Take the beneficiation of an iron sand ore containing 3% magnetic iron in a sandy loose accumulation in China as an example.

[0031] use as figure 1 The shown dry beneficiation process for extracting iron concentrate from extremely lean sand iron ore has the following process steps:

[0032] (1) Screening and removing impurities of iron placer ore: feed iron placer ore into a vibrating screen with a screen hole size of 8mm to obtain lump ore containing impurities on the screen and fine ore under the screen;

[0033] (2) Dry pre-selection: Feed the fine ore obtained in step (1) into a dry magnetic separator with a magnetic field strength of 0.5t and a drum line speed of 1.2m / s for magnetic separation, and then feed it into a magnetic field with a strength of 0.4t. The dry magnetic separator with a speed of 1.8m / s performs secondary magnetic separation to obtain medium ore products and weak magnetic or non-magnetic tailings products, and the ore grade is increased to 23...

Embodiment 3

[0037] Take the beneficiation of a sandy iron sand ore containing 10% magnetic iron as an example.

[0038] use as figure 1 The shown dry beneficiation process for extracting iron concentrate from extremely lean sand iron ore has the following process steps:

[0039] (1) Iron placer ore screening and impurity removal: Feed placerite ore into a vibrating screen with a sieve hole size of 12mm to obtain lump ore with impurities on the sieve and fine ore under the sieve, and the yield on the sieve is 11.21%;

[0040] (2) Dry pre-selection: Feed the fine ore obtained in step (1) into a dry magnetic separator with a magnetic field strength of 0.3t and a drum line speed of 1.8m / s for magnetic separation. Magnetic gangue, ore iron grade increased to 17%;

[0041] (3) Dry grinding: dry-type closed-circuit grinding is performed on the medium ore product obtained in step (2) to obtain a grinding product with a particle size of less than 200 mesh and a particle fraction content of 30%; ...

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Abstract

The invention discloses a dry beneficiation process for extracting iron ore concentrates from extremely lean sand iron ore. The dry beneficiation process comprises the following steps of (1) sand iron ore screening and impurity removing, wherein the sand iron ore is fed into a vibration screen with the screen hole size ranging from 3 mm to 12 mm, and oversize impurity containing lump ore and undersize powder ore are obtained; (2) dry pre-selection, wherein the powder ore obtained in the step (1) is fed into a dry magnetic separator to be subjected to magnetic separation, and middling products and weakly-magnetic or non-magnetic tailing products are obtained; (3) dry ore grinding, wherein the middling products obtained in the step (2) are subjected to dry closed-loop ore grinding, and ground ore products with the particle size being smaller than 200 meshes and the particle content ranging from 30% to 90% are obtained; and (4) dry concentration, wherein the ground ore products obtained in the step (3) are fed into a drum magnetic separator with the linear speed ranging from 2.0 m / s to 4.0 m / s and the magnetic field strength ranging from 0.3 T to 0.4 T to be subjected to 2-3 stages of concentration, and iron ore concentrate products with the iron grade being larger than 60% are obtained.

Description

technical field [0001] The invention relates to the technical field of a dry beneficiation process for extracting iron concentrates, in particular to a dry beneficiation process for extracting iron concentrates from extremely lean sand iron ore. Background technique [0002] Northwest China has a large amount of iron placer deposits formed by the long-term erosion and elutriation of rocks by water or wind and sand. It is less than 15%. In the past, this type of fine sand was not within the scope of mining standards, and no enterprise developed it as ore. With the development of the iron and steel industry, the demand for iron concentrate is increasing. The resources are dwindling day by day, mining this part of iron sand ore has become the best choice. [0003] However, the current method of extracting iron ore concentrate from extremely lean sand iron ore is too complex in process, high in investment, and low in ore yield. The separation equipment used is a wet magnetic se...

Claims

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Application Information

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IPC IPC(8): B03C1/30B03B9/00
CPCB03C1/30B03B9/00
Inventor 刘金长
Owner JIUQUAN IRON & STEEL GRP
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