Dry pre-concentration process for weakly magnetic iron ore by size grading

An iron ore and weak magnetic technology, applied in the field of dry classification pre-selection process of weak magnetic iron ore, can solve the problem that weak magnetic iron ore cannot be pre-selection or the cost of pre-selection is high, so as to improve competitiveness, reduce costs, and achieve uniform particle size. Effect

Active Publication Date: 2016-09-21
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a dry classification and pre-selection process for weak magnetic iron ore in view of the problem that weak magnetic iron ore cannot be pre-selected or the cost of pre-selection is high in the prior art

Method used

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  • Dry pre-concentration process for weakly magnetic iron ore by size grading

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Experimental program
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Effect test

Embodiment 1

[0015] Take 1 ton of 0~-80mm weak magnetic iron ore from Jiugang Jingtieshan, iron grade 32%, surrounding rock content 8%, iron ore specific gravity 4.2g / cm 3 , The specific gravity of the surrounding rock is 2.6g / cm 3 , do the following:

[0016] A. The weak magnetic iron ore is screened and classified by mechanical vibrating screen, and divided into 0~-15mm, +15~-30mm, +30~-50mm, +50~-80mm;

[0017] B. Use a multi-roller particle size classification device to classify ore with a particle size of 0~-15mm into 3 particle size ranges: 0~-3mm, +3~-10mm, and +10~-15mm;

[0018] C. The above-mentioned 0~-3mm size iron ore is pre-selected by dry strong magnetic separator, the magnetic field strength of magnetic separation is 8000 Oe, +3~-10mm, +10~-15mm, +15~-30mm, +30 ~-50mm, +50~-80mm iron ore particle size ranges are separated from the ore and surrounding rock by using composite dry gravity separation equipment, and the content of surrounding rock in each particle size iron or...

Embodiment 2

[0020] Take 1 ton of low-grade and weakly magnetic iron ore from Jingtieshan Huashugou V ore body in Jiugang, with iron grade of 22%, surrounding rock content of 15%, and iron ore specific gravity of 4.0g / cm 3 , The specific gravity of the surrounding rock is 2.5g / cm 3 , do the following:

[0021] A. The weak magnetic iron ore is screened and classified by mechanical vibrating screen, and divided into 0~-15mm, +15~-30mm, +30~-50mm, +50~-80mm;

[0022] B. Use a multi-roller particle size classification device to classify ore with a particle size of 0~-15mm into 3 particle size ranges: 0~-3mm, +3~-10mm, and +10~-15mm;

[0023] C. The above-mentioned 0~-3mm size iron ore is pre-selected by dry strong magnetic separator, the magnetic field strength of magnetic separation is 9000 Oe, +3~-10mm, +10~-15mm, +15~-30mm, +30 ~-50mm, +50~-80mm iron ore particle size ranges are separated from the ore and surrounding rock by using composite dry gravity separation equipment, and the conten...

Embodiment 3

[0025] Take 1 ton of JISCO Sidaogou weak magnetic iron ore, the iron grade is 26%, the surrounding rock content is 13%, and the iron ore specific gravity is 3.6g / cm 3 , The specific gravity of the surrounding rock is 2.1g / cm 3 , do the following:

[0026] A. The weak magnetic iron ore is screened and classified by mechanical vibrating screen, and divided into 0~-15mm, +15~-30mm, +30~-50mm, +50~-80mm;

[0027] B. Use a multi-roller particle size classification device to classify ore with a particle size of 0~-15mm into 3 particle size ranges: 0~-3mm, +3~-10mm, and +10~-15mm;

[0028] C. The above-mentioned 0~-3mm size iron ore is pre-selected by dry strong magnetic separator, the magnetic field strength of magnetic separation is 10000 Oe, +3~-10mm, +10~-15mm, +15~-30mm, +30 ~-50mm, +50~-80mm iron ore particle size ranges are separated from the ore and surrounding rocks by composite dry gravity separation equipment, and the content of surrounding rocks in each particle size ir...

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Abstract

The invention relates to a dry pre-concentration process for weakly magnetic iron ore by size grading. The process mainly includes the following process steps that the granularity of weakly magnetic iron ore ranges from 0 to 80 mm after the weakly magnetic iron ore is crushed, and the crushed weakly magnetic iron ore is graded in different particle size ranges of 0 to 15 mm, 15 mm to 30 mm, 30 mm to 50 mm, 50 mm to 80 mm and the like through a mechanical vibration screen; the ore with the particle size of 0 to 15 mm is graded in different particle size ranges of 0 to 3 mm, 3 mm to 10 mm, 10 mm to 15 mm and the like through a multi-roller granularity classification device or a fine screen; and the iron ore in different particle size ranges is subjected to separation of ore and surrounding rock through a dry type high-intensity magnetic separation machine, a jigger and composite dry type gravity concentration equipment. Dry type pre-concentration of the weakly magnetic iron ore is achieved, and the technical problem that the weakly magnetic iron ore cannot be subjected to pre-concentration or pre-concentration cost is high is solved; and conditions are created for reducing following ore dressing procedure cost and improving ore feed grades, the domestic weakly magnetic iron ore development and utilization cost is further reduced, and the competitive power of iron and steel enterprises is improved.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a dry-type classification and pre-selection process of weak magnetic iron ore. Background technique [0002] my country's iron ore resources are rich in lean ore and less in magnetic rich ore. Weak magnetic iron ore accounts for more than 70% of the total reserves. The 0~-15mm grain size ore of Jiugang mirror iron ore resources is generally classified by strong magnetic separation process. During processing, there is a large amount of surrounding rock mixed in, which affects the cost and indicators of mineral processing; 15~-80mm iron ore is magnetized and roasted in a shaft furnace, and the roasted ore after roasting is thrown away by magnetic pulleys and burned. Entering the next grinding and sorting process, there is a problem that 5-12% of the surrounding rock is mixed with iron ore for magnetization roasting in the shaft furnace, which affects the produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B7/00
CPCB03B7/00
Inventor 展仁礼王欣郭忆寇明月李慧春边立国白江虎杏仲全张红军
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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