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Method for recovering iron concentrate from iron tailings and obtained iron concentrate

A technology for iron tailings and iron recovery, applied in chemical instruments and methods, magnetic separation, solid separation, etc., can solve the problem of low recovery rate and achieve the effect of improving recovery rate

Inactive Publication Date: 2017-02-08
湖南鑫生矿冶废弃物综合利用科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a method for recovering iron concentrate from iron tailings and the obtained iron concentrate, so as to solve the technical problem of low recovery rate caused by using reverse flotation in the prior art

Method used

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  • Method for recovering iron concentrate from iron tailings and obtained iron concentrate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] 1) The iron tailings (the total iron grade is 12%, the silica content is 70%) are first sieved through a high-frequency fine sieve to obtain the first mineral of +100 mesh and the second mineral of -100 mesh;

[0049] 2) Ball mill the first mineral until the mineral content of -400 mesh is 50%, the magnetic field strength is 15000Gs during magnetic separation, and the first concentrate with a total iron grade of 30% is obtained. For the second mineral, Φ150 and The Φ100 two-stage hydrocyclone performs the second screening to obtain the third mineral of -100~+400 mesh.

[0050] 3) Ball mill the second mineral to a mineral content of -400 mesh with a particle size of 50% and a magnetic field strength of 15000 Gs during magnetic separation to obtain a second concentrate with a total iron grade of 30%;

[0051] 4) Mix the first concentrate and the second concentrate to obtain the concentrate, add sodium bicarbonate to make the pH 10-11, and agglomerate the concentrate. The agglome...

Embodiment 2

[0055] 1) The iron tailings (the total iron grade is 17% and the silica content is 80%) are first sieved with a high-frequency fine sieve to obtain the first mineral of +100 mesh and the second mineral of -100 mesh;

[0056] 2) Ball mill the first mineral until the mineral content of -400 mesh is 60%, the magnetic field strength is 18000Gs during magnetic separation, and the first concentrate with 35% iron grade is obtained. For the second mineral, Φ150 and The Φ100 two-stage hydrocyclone performs the second screening to obtain the second mineral of -100~+400 mesh.

[0057] 3) Ball mill the second mineral to a mineral content of -400 mesh with a particle size of 60% and a magnetic field strength of 18000 Gs during magnetic separation to obtain a second concentrate with a total iron grade of 35%;

[0058] 4) Mix the first concentrate and the second concentrate to obtain the concentrate, add sodium hydroxide to make the pH 10-11, and agglomerate the concentrate. The agglomeration agent...

Embodiment 3

[0062] 1) The first sieving of iron tailings (total iron grade is 15%, silica content is 75%) is performed to obtain the first mineral of +100 mesh and the second mineral of -100 mesh. The first sieving adopts high frequency fine Sieve

[0063] 2) Ball mill the first mineral until the mineral content of -400 mesh is 60%, and the magnetic field strength is 17000Gs during magnetic separation, to obtain the first concentrate with a total iron grade of 34%. For the second mineral, Φ150 and The Φ100 two-stage hydrocyclone performs the second screening to obtain the second mineral of -100~+400 mesh.

[0064] 3) Ball mill the second mineral to a mineral content of -400 mesh with a particle size of 60% and a magnetic field strength of 17000 Gs during magnetic separation to obtain a second concentrate with a total iron grade of 34%;

[0065] 4) Mix the first concentrate and the second concentrate to obtain the concentrate. The concentrate is deslimed by a desliming machine. After desliming, ...

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Abstract

The invention provides a method for recycling iron ore concentrate from iron tailings and obtained iron ore concentrate. According to the method, minerals with different grain sizes in the iron tailings are processed in a staged mode, and after ball-milling and magnetic separating, the obtained concentrate is reunited and separated, and then the iron ore concentrate is obtained. The total iron grade of the obtained iron ore concentrate is larger than 65 percent, and the recycling rate is larger than 46 percent.

Description

Technical field [0001] The invention relates to the field of iron recovery from iron tailings, in particular to a method for recovering iron concentrate from iron tailings and the obtained iron concentrate. Background technique [0002] As a major steel producer, my country has a huge annual demand for iron ore. Most of the iron in the mined iron ore has been extracted. How to enrich the iron in the iron tailings to obtain iron concentrate has become an urgent problem to be solved. For many years, the following methods have been used to recycle iron in iron tailings: [0003] (1) Use two-stage spiral chute selection and weak magnetic scanning to obtain a coarse concentrate with a grade of 28-32%, and then use the "weak / strong magnetic-reverse flotation" process to separate the coarse concentrate after regrind , Recover hematite and magnetic ore in tailings; [0004] (2) The iron tailings are separated by weak magnetic and strong magnetic to obtain a coarse concentrate with a grade...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03B1/00B03C1/30
Inventor 陈述明王杨
Owner 湖南鑫生矿冶废弃物综合利用科技有限公司
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