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Process for Sorting Iron Concentrate from Lean Magnetite Tailings

A technology of lean magnetite and iron concentrate, which is applied in the fields of magnetic separation, solid separation, chemical instruments and methods, etc., can solve the problems that the minerals cannot reach the dissociated state, the regrinding particle size is insufficient, and the metal recovery rate is low. Achieve the effect of reducing tailings grade, reducing regrinding amount and improving concentrate quality

Active Publication Date: 2015-11-11
ANSTEEL GRP MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the insufficient regrinding particle size, the minerals cannot reach a good dissociation state, the grade of the concentrate after re-selection is only 58%-60%, the metal recovery rate is very low, and the cost of mineral processing is high.

Method used

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  • Process for Sorting Iron Concentrate from Lean Magnetite Tailings
  • Process for Sorting Iron Concentrate from Lean Magnetite Tailings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Such as figure 2 Shown, a kind of process of separating iron ore concentrate from lean magnetite tailings of the present invention is characterized in that comprising the following steps:

[0018] 1) After the lean magnetite tailings with a grade of 8-11% are recovered by a disc recovery machine, the grade of the rough concentrate is 18.21%, and the grade of the rough concentrate is separated by a pre-selection magnetic separator, and the discarded grade is <8.24 % of qualified tailings,

[0019] 2) The concentrate of the pre-selection magnetic separator is fed into the primary classification, and the overflow particle size of the primary classification reaches -200 mesh with a content of 80%, and then fed into the second-stage magnetic separation to obtain the magnetic separation concentrate and tailings with a grade of 44.58% in the second stage. The underflow of primary classification is fed into a stage of closed-circuit grinding formed by primary ball milling,

...

Embodiment 2

[0024] After the second-stage magnetic separation concentrate is fed into the second-stage tower mill for grinding, the particle size reaches -500 mesh and the content is 90%, and then fed into the third-stage magnetic separator for separation to obtain the third-stage magnetic separator concentrate and tailings ,

[0025] Feed the concentrate of the three-stage magnetic separation into the fourth-stage magnetic separator, and feed the concentrate of the fourth-stage magnetic separator into the fifth-stage magnetic separator. Mine, other steps are with embodiment 1. The yield is 19.49%, the tailings grade is 6.35%, and the metal recovery rate is 71.94%.

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Abstract

The invention relates to a technology for screening iron ore concentrate from mineral tailing of low-grade ore. The invention is characterized by comprising the following steps: recycling crude ore concentrate with grade of 16-20% from mineral tailing of low-grade ore with grade of 8-11% through a disc recycling machine; feeding the crude ore concentrate into a one-section preselection magnetic separator for screening; feeding the ore concentrate from the preselection magnetic separator into a one-time classification; then feeding the overflow of the one-time classification into a two-section magnetic separator, and feeding the underflow of the one-time classification into a section of closed grinding ore formed through one-time ball mill; feeding the ore concentrate passing through the two-section magnetic separator into a two-section tower mill to carry out ore grinding, so as to obtain ore concentrate with graininess of 325-500 meshes with the content of 90%; then feeding the ore concentrate into a three-section magnetic separator, a four-section magnetic separator, and a five-section magnetic separator for machining screen respectively; obtaining the final ore concentrate with the grade of 64.98-67.21%, wherein the preselection magnetic separator mineral tailing, the two-section mineral tailing, the three-section mineral tailing, the four-section mineral tailing, and the five-section mineral tailing are the final mineral tailing in total. The invention has the advantages that the technology can lower the grade of the mineral tailing, and increase metal recovery rate; the grade of the ore concentrate can reach 64.98-67.21%, and is 7-9.5% larger than the grade of the ore concentrate of a conventional reselection technology.

Description

technical field [0001] The invention belongs to the technical field of ore dressing, in particular to a process for sorting iron concentrates from lean magnetite tailings. Background technique [0002] In the existing re-election process for processing lean magnetite tailings in Anshan City, the tailings grade is generally between 8% and 11%. First, the disc recovery machine is used to recover the tailings produced on site to obtain the rough concentrate of the recovery machine. Then, the "coarse concentrate regrinding, magnetic separation-fine screening process" is used for separation. The grade of the concentrate after re-selection is only 58% to 60%, and the metal recovery rate is very low. [0003] The existing magnetite tailings re-election process is generally as follows: After the coarse concentrate (that is, the concentrate of the disc recovery machine) is concentrated by a concentrating magnetic separator, the concentrate of the concentrator is fed into the re-grind...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03C1/00
Inventor 张丛香刘双安钟刚杨晓峰
Owner ANSTEEL GRP MINING CO LTD