Ore dressing process for reducing content of silicon dioxide in iron ore concentrate

A silica and iron concentrate technology, applied in solid separation and other directions, can solve the problems of high SiO2 content, low recovery rate of iron concentrate, high content, reduce impurity content, avoid high iron grade in tailings, improve The effect of concentrate quality

Active Publication Date: 2018-12-11
马钢集团设计研究院有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Aiming at improving the quality and reducing SiO in the concentrate with low-grade magnetite ore in the prior art 2 high content, over-grinding, and low recovery rate of iron ore concentrate, the invention provides a beneficiation process for reducing the content of silicon dioxide in iron ore concentrate
By sieving the coarse and fine ore and then using the elutriation machine and the second-stage continuous selection of the magnetic desliming tank, it not only solves the problem of improving the quality of the concentrate and reducing impurities, but also solves the problem of SiO in the concentrate. 2 high content problem

Method used

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  • Ore dressing process for reducing content of silicon dioxide in iron ore concentrate
  • Ore dressing process for reducing content of silicon dioxide in iron ore concentrate
  • Ore dressing process for reducing content of silicon dioxide in iron ore concentrate

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Effect test

Embodiment 1

[0041]A kind of beneficiation process of reducing silicon dioxide content in the iron concentrate of the present embodiment, the steps are:

[0042] Step 1. Crushing: For low-grade magnetite ore, the grade of iron ore raw ore is 15-20%, the occupancy rate of magnetic iron in the ore is 75-90%, and the gangue minerals are mainly albite, epidote, and green clay Stone, actinolite, etc., are crushed to -20mm particles, and then wet pre-selected to -3mm coarse concentrate by high-pressure roller mill ultra-fine crushing and screening fully closed-circuit process;

[0043] Step 2, ore grinding: carry out second stage grinding-classification-weak magnetic separation (ie figure 1 The second-stage grinding and magnetic separation concentrate at the top of the middle), specifically:

[0044] (1) Perform one-stage grinding-classification-one-stage weak magnetic separation on the wet pre-selection coarse concentrate to obtain a one-stage weak magnetic separation coarse concentrate and th...

Embodiment 2

[0053] A kind of beneficiation process of reducing the silicon dioxide content in the iron concentrate of the present embodiment, the basic steps are the same as embodiment 1: the steps are:

[0054] Step 1. Crushing: For low-grade magnetite ore, the grade of iron ore raw ore is 19.51%, the occupancy rate of magnetic iron in the ore is 75-90%, and SiO 2 The content is 6.80%. The gangue minerals are mainly albite, epidote, chlorite, actinolite, etc., crushed to 20-0mm particles, and then subjected to high-pressure roller mill ultra-fine crushing and full-closed wet pre-selection to -3mm rough concentrate;

[0055] Step 2, ore grinding: carry out the second stage of ore grinding-classification-weak magnetic separation, specifically:

[0056] (1) Perform one-stage grinding-classification-one-stage weak magnetic separation on the wet pre-selection coarse concentrate to obtain a one-stage weak magnetic separation coarse concentrate and throw out the tailings;

[0057] (2) The fir...

Embodiment 3

[0065] A kind of beneficiation process of reducing the silicon dioxide content in the iron ore concentrate of the present embodiment, the basic steps are the same as embodiment 2, the difference and improvement are: the steps are:

[0066] Step 1. Crushing: For low-grade magnetite ore, the grade of iron ore raw ore is 18.51%, the occupancy rate of magnetic iron in the ore is 75-90%, and SiO 2 The content of gangue minerals is 6.2%. The gangue minerals are mainly albite, epidote, chlorite, actinolite, etc., crushed to 20-0mm particles, and then carry out high-pressure roller mill ultra-fine crushing and screening full-closed wet pre-selection process to- 3mm rough concentrate;

[0067] Step 2, ore grinding: carry out the second stage of ore grinding-classification-weak magnetic separation, specifically:

[0068] (1) Perform one-stage grinding-classification-one-stage weak magnetic separation on the wet pre-selection coarse concentrate to obtain a one-stage weak magnetic separa...

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Abstract

The invention belongs to the technical field of ore dressing and discloses an ore dressing process for reducing the content of silicon dioxide in iron ore concentrate. The ore dressing process includes: step one, crushing, to be more specific, crushing low-grade magnetic iron ore into size smaller than 20mm, and performing high-pressure rolling, superfine grinding and sieving and full-closed wet pre-separation to obtain rough concentrate in size smaller than 3mm; step two, ore grinding and magnetic separation, to be more specific, to be more specific, performing two-stage ore grinding, gradingand low-intensity magnetic separation; step three, fine sieving, to be more specific, feeding the magnetically separated rough concentrate into a fine sieve for sieving, and then returning materialson the sieve to a two-stage grinding system, wherein the sieve mesh size is 0.075-0.1mm; step four, feeding sieved powder into a wash mill, and concentrating to obtain washed concentrate; step five, magnetic desliming, to be more specific, subjecting the washed concentrate to concentration in a magnetic desliming tank to obtain final concentrate, wherein the SiO2 content is reduced to 3.5% or below. After two-stage grinding and low-intensity magnetic separation, two-stage continuous concentration is performed through the wash mill and the magnetic desliming tank, so that the problem of high SiO2 content of the ore concentrate is solved while quality improvement and impurity reduction of the ore concentrate are realized.

Description

technical field [0001] The invention relates to the technical field of mineral processing, in particular to a mineral processing process for reducing the content of silicon dioxide in iron concentrate. Background technique [0002] Under the condition of market economy, iron and steel enterprises will pursue higher economic benefits and profits in the future, and put forward higher and higher requirements for the quality of iron concentrate. At present, the main quality indicators of high-quality pellets in the world have been raised to iron ≥ 66%, SiO 2 ≤3%, P≤0.05%, etc., so that the iron grade of iron concentrate, which is the main raw material in pellets, requires higher SiO 2 Only in this way can the technical and economic indicators of blast furnace ironmaking be improved, and conditions can be created to achieve high quality and low cost. [0003] Since there is a large amount of magnetic fine powder suitable for pellet production in my country, the production of pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B9/00B03B1/00
CPCB03B1/00B03B9/00
Inventor 孙业长陈于海刘建华洪振川束剑耿希华江斌
Owner 马钢集团设计研究院有限责任公司
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