Method for recovering magnetite in brown iron ore concentrate

A technology for magnetite and magnetite concentrate, applied in chemical instruments and methods, magnetic separation, high-gradient magnetic separators, etc., can solve the problems of waste of resources, pollute the environment, low economic benefits, etc., and achieve the effect of improving recovery efficiency

Inactive Publication Date: 2019-01-15
鹤庆北衙矿业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If it is directly discarded, a large amount of solid waste will be generated, which will pollute the environment and cause waste of resources. Re-refining can obtain a large amount of iron-containing ore
[0003] In the cyanidation step of extracting gold at this stage, limonite concentrate (raw ore) needs to be finely ground first, during which most ultra-fine (≤0.02mm) magnetite will be produced, due to ultra-fine magnetic Iron ore has a low specific magnetic susceptibility coefficient, and the magnetic force received during the production process is small, so it is difficult to separate it from limonite concentrate, resulting in low efficiency and low economic benefits in magnetic separation operations.

Method used

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  • Method for recovering magnetite in brown iron ore concentrate
  • Method for recovering magnetite in brown iron ore concentrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Adjust the cyanide tailings to a 25% slurry;

[0026] (2) Under the condition of the magnetic field strength of 230mT, the slurry in the step (1) is subjected to weak magnetic roughing with a semi-countercurrent drum magnetic separator to form magnetite concentrate A and tailings A;

[0027] (3) Under the condition that the magnetic field strength is 180mT, the magnetite concentrate A produced in step (2) is subjected to weak magnetic separation with a semi-countercurrent drum magnetic separator to form magnetite concentrate B and magnetite medium ore;

[0028] (4) Sweep the tailings A produced in step (2) and the magnetite medium produced in step (3) with a semi-countercurrent drum magnetic separator under the condition of a magnetic field strength of 370mT to form a magnet concentrate A' and tailings B;

[0029] (5) The magnetite concentrate A' produced in the step (4) is mixed into the magnetite concentrate A to carry out the step (3) treatment;

[0030] (6) Un...

Embodiment 2

[0037] (1) Adjust the cyanide tailings to a 35% slurry;

[0038] (2) Under the condition of the magnetic field strength of 180mT, the slurry in the step (1) is subjected to weak magnetic roughing with a semi-countercurrent drum magnetic separator to form magnetite concentrate A and tailings A;

[0039] (3) Under the condition that the magnetic field strength is 140mT, the magnetite concentrate A produced in step (2) is subjected to weak magnetic separation with a semi-countercurrent drum magnetic separator to form magnetite concentrate B and magnetite medium ore;

[0040] (4) Sweep the tailings A produced in step (2) and the magnetite medium produced in step (3) with a semi-countercurrent drum magnetic separator under the condition of a magnetic field strength of 320mT to form a magnet concentrate A' and tailings B;

[0041] (5) The magnetite concentrate A' produced in the step (4) is mixed into the magnetite concentrate A to carry out the step (3) treatment;

[0042] (6) Un...

Embodiment 3

[0050] 1. Determination of iron index in the original production mode

[0051] The identified iron concentrate samples were taken from the magnetic separation products of a gold beneficiation plant in Yunnan after all-slime cyanidation. The grade of the magnetite concentrate was 63.29%, the yield rate was 2.88%, the iron recovery rate was 6.72%, and the limonite concentrate was 63.29%. The ore grade is 50.95%, the yield rate is 16.79%, and the iron recovery rate is 31.54%; the calculation results of the particle size recovery rate of iron are shown in Table 1:

[0052] Table 1 Calculation results of iron fraction recovery rate

[0053]

[0054] The metal occupancy rate in the above table refers to the percentage of recovered metals to the original ore metals.

[0055] The calculation results of the recovery rate of magnetic separation products show that the metal occupancy rate of ≤0.02mm particle size in the magnetite concentrate is 0.017%, which is basically not recovered,...

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Abstract

The invention belongs to the technical field of magnetite recovery, and particularly relates to a method for recovering magnetite in a brown iron ore concentrate. After a magnetic separation operationcombination of a plurality of times of roughing and concentration, a semi-countercurrent low-intensity magnetic separator with the corresponding magnetic field intensity is used for roughing, a resulting magnetite concentrate is further selected by a wet-type semi-countercurrent drum magnetic separator with the corresponding magnetic field intensity, and the recovery efficiency is improved. In order to solve the problem that the magnetite recovery rate of the magnetic separation operation is low, firstly magnetic separation is performed by a high-intensity magnetic separator, and then low-intensity magnetic separation is performed to recover the magnetite in the brown iron ore concentrate to improve the recovery rate of the magnetite and increase the benefits of an enterprise.

Description

technical field [0001] The invention belongs to the technical field of magnetite recovery, in particular to a method for recovering magnetite from limonite concentrate. Background technique [0002] Gold is one of the rarer, most precious and highly valued metals. It is not only a special currency used for reserve and investment, but also an important material for jewelry industry, electronics industry, modern communication, aerospace industry and other sectors. The extraction of gold generally goes through the steps of paddle adjustment-cyanidation-replacement of gold-gold mud smelting-gold and so on. The process of extracting gold with cyanide as a leaching solution is called cyanidation gold extraction, which is the main method for extracting gold from ores or concentrates in modern times. The explanation of the mechanism of cyanide on the dissolution of gold is still inconsistent. Most of them believe that gold can form a gold complex and dissolve in the presence of ox...

Claims

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Application Information

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IPC IPC(8): B03C1/02B03C1/025B03C1/10
CPCB03C1/02B03C1/025B03C1/10
Inventor 庄世明段胜红尹福兴汪勇周癸武
Owner 鹤庆北衙矿业有限公司
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