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Magnetic-red mixed lean iron ore pre-concentration technology

A technology of iron ore and process, which is applied in the field of pre-selection of magnetic-red mixed lean iron ore and magnetic-red mixed lean iron ore, which can solve the problem of poor separation effect of fine-grained grade, deterioration of separation index, and equipment Difficulty in configuration and other problems, to achieve obvious effect of emission reduction

Inactive Publication Date: 2019-04-26
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main pre-selection process is drum-type medium magnetic + roller-type strong magnetic dry separation. The disadvantage is that the separation effect on fine-grained grades is poor, especially when the moisture content of the ore is high, the separation index will deteriorate sharply; In addition, there is a drum type medium magnetic + large particle vertical ring pulsation high gradient strong magnetic pre-selection process. In recent years, strong magnetic separation equipment manufacturers have successfully developed a large particle vertical ring pulsation high gradient strong magnetic separator, which can process red iron below -3mm Ore, but it must be used in conjunction with a high-pressure roller mill. The high-pressure roller mill will crush all the finely crushed products to -3mm before using this process. The number of large-grain vertical ring pulsating high-gradient strong magnetic separators required is large, and then Coupled with high-pressure roller mill equipment, on-site equipment configuration is difficult and the investment is large, which makes many magnetic-red mixed lean iron ore dressing plants daunting

Method used

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  • Magnetic-red mixed lean iron ore pre-concentration technology
  • Magnetic-red mixed lean iron ore pre-concentration technology

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Experimental program
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Effect test

Embodiment 1

[0034] Such as figure 1 and figure 2 As shown, a kind of pre-selection process of magnetic-red mixed lean iron ore of the present embodiment comprises the following steps:

[0035] a. The magnetic-red mixed lean iron ore (-300mm) extracted from underground mining and lifted up is crushed into a finely crushed product of -12mm through three sections and one closed circuit; the TFe grade of the magnetic-red mixed lean iron ore is 20 -30%, the TFe grade in this embodiment is 25%; the ore with an iron grade below 20% still does not have the conditions for development and utilization under the current mining situation, and the ore with an iron grade above 30% usually directly adopts grinding technology. Embodiment Carry out follow-up pre-selection process for ore with TFe grade at 20-30%;

[0036] b. Screen the finely crushed product through a wet linear sieve to obtain two particle grades of -12+3mm and -3mm, and adopt different pre-selection methods for the particle size chara...

Embodiment 2

[0047] The preselection process of a kind of magnetic-red mixed lean iron ore of this embodiment is basically the same as embodiment 1, the difference is that the TFe grade of magnetic-red mixed lean iron ore is 20% in the present embodiment, step b The linear sieve sieve plate adopted in is a perforated steel sieve plate, and the sieve hole size is 5mm; in the step c, the -3mm particle size product adopts a wet permanent magnetic drum type medium magnetic separator for medium magnetic separation, and the magnetic field strength is 0.5T. The magnetic separation tailings flow into the large particle vertical ring pulsating high gradient strong magnetic separator for strong magnetic separation with a magnetic field strength of 1.3T; in step d, the -12+3mm grain grade products are transported to the permanent magnetic cylinder type medium magnetic field dry by belt The separator carries out medium magnetic dry separation, and the magnetic field strength is 0.4T, and the middle mag...

Embodiment 3

[0049] The preselection process of a kind of magnetic-red mixed lean iron ore of the present embodiment is basically the same as embodiment 1, the difference is that the TFe grade of the magnetic-red mixed lean iron ore in the present embodiment is 30%, step b The linear sieve sieve plate adopted in is a perforated steel sieve plate, and the sieve hole size is 4mm; the -3mm particle size product in step c adopts a wet permanent magnet drum type medium magnetic separator for medium magnetic separation, and the magnetic field strength is 0.6T. The magnetic separation tailings flow into the large particle vertical ring pulsating high-gradient strong magnetic separator for strong magnetic separation with a magnetic field strength of 1.4T; in step d, the -12+3mm grain grade products are transported to the permanent magnetic cylinder type medium magnetic field dry by belt The separator carries out medium magnetic dry separation, and the magnetic field strength is 0.5T, and the middle...

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Abstract

The invention discloses a magnetic-red mixed lean iron ore pre-concentration technology and belongs to the field of iron ore concentration. The magnetic-red mixed lean iron ore pre-concentration technology includes the following steps that a, magnetic-red mixed lean iron ore is broken into -12 mm fine ground products through three sections and one closed loop; b, the fine ground products are subjected to wet type linear screen screening, and two fractions of -12+3 mm and -3 mm are obtained; c, the -3 mm fraction products are subjected to intermediate magnetic separation, intermediate magneticseparation tailings are subjected to strong magnetic separation, strong magnetic separation tailings are classified through a screw classifying machine, and intermediate magnetic separation concentrates and strong magnetic separation concentrates are merged, dewatered and then conveyed into a fine ore bin; and d, the -12+3 mm fraction products are subjected to intermediate magnetic dry separation,intermediate magnetic dry separation tailings are subjected to strong magnetic dry separation, and intermediate magnetic dry separation concentrates and strong magnetic dry separation concentrates are combined and conveyed into the fine ore bin. By means of the magnetic-red mixed lean iron ore pre-concentration technology, the defects that in the prior art, the concentration investment of magnetic-red mixed lean iron ore is large, and difficulty is high are overcome, and the magnetic-red mixed lean iron ore pre-concentration technology is provided and is particularly suitable for treating themagnetic-red mixed lean iron ore with the TFe grade ranging from 20.0% to 30.0%.

Description

technical field [0001] The invention relates to the technical field of iron ore beneficiation, more specifically, to a pre-selection process of magnetic-red mixed lean iron ore, especially suitable for processing magnetic-red mixed lean iron ore with a TFe grade between 20.0% and 30.0%. iron ore. Background technique [0002] Pre-selection is an important part of iron ore beneficiation, and pre-selection and throwing tails are an important means to realize "more crushing and less grinding" and "capable throwing and early throwing". For single magnetite, the application of pre-selection is becoming more and more mature. Before 2004, the pre-selection of magnetite was mainly used for coarse crushing (-300mm) and medium crushing (-75mm) by large dry magnetic separation; The finely crushed products (-12mm) are pre-selected and discarded by a wet-type coarse-grained medium-magnetic separator. In 2004, with the successful application of high-pressure roller mills, the particle s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B9/00B03B5/52
CPCB03B5/52B03B9/00B03C1/025B03C1/10B07B1/00B07B2230/01
Inventor 李明阳代献仁张颖异陆虎胡义明皇甫明柱
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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