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Beneficiation method for mixed magnetite and hematite

A beneficiation method and iron ore technology, which are applied in the field of maghemite mixed iron ore beneficiation, can solve the problems of low magnetic separation iron recovery rate, less than 50% recovery rate, large consumption of flotation reagents, etc. Efficient recycling, the effect that is conducive to efficient recycling

Active Publication Date: 2013-11-13
CHANGSHA RES INST OF MINING & METALLURGY
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the above-mentioned ore dressing process has a low magnetic separation iron recovery rate for the fine-grained magnetic and hematite, and the recovery rate is less than 50%. Disadvantages such as large size and low grade of flotation iron concentrate

Method used

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Experimental program
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Effect test

Embodiment 1

[0039] In the iron ore processed in this embodiment, the iron minerals are mainly hematite, followed by magnetite and false hematite, and sporadic limonite is occasionally seen; the gangue minerals are mainly quartz, followed by feldspar and chlorite , sericite, actinolite and apatite. The fine grain size of magnetite is less than 0.03mm, generally 0.04-0.15mm, which belongs to the category of micro-grain intercalation; the grain size of hematite is very small, mostly between 0.002-0.010mm, which belongs to the category of extremely fine grain intercalation . Specific steps are as follows:

[0040] A) Use a horizontal long tube ball mill to grind -15mm raw ore with an iron grade of 28% in the first and second stages of continuous ball milling, and add 500% of dispersant water glass to the second stage of the ball mill. 1000g / t, the fineness of the overflow pulp obtained after the second-stage grinding machine is classified by the cyclone is -200 mesh, accounting for 95%, and...

Embodiment 2

[0045] In the iron ore processed in this implementation, the iron minerals are mainly magnetite, followed by hematite and a small amount of false hematite, and the gangue minerals are mainly quartz, followed by sericite, chlorite, feldspar, and sapphire. Achilles, tremolite, calcite, dolomite and zoisite. The fine-grained magnetite in the ore is mostly between 0.01-0.03mm, and the hematite is mostly distributed in the gangue in a fine disseminated shape. Except for a few particles that can reach about 0.04mm, most of them are between 0.002-0.03mm between. Specific steps are as follows:

[0046] A) The -15mm grain size raw ore with an iron grade of 27.5% is ground by a horizontal long-tube ball mill for the first stage of grinding, and the pulp after the first stage of grinding is classified by a cyclone to obtain a pulp overflow fineness of -200 mesh Accounting for 65%, the cyclone overflow pulp is sorted by weak magnetic separation, and the tailings of weak magnetic separat...

Embodiment 3

[0051] In the iron ore processed in this embodiment, the iron minerals are mainly hematite, followed by magnetite and false hematite, and sporadic limonite is occasionally seen; the gangue minerals are mainly quartz, followed by feldspar and chlorite , sericite, actinolite and apatite. The fine grain size of magnetite is less than 0.03mm, generally 0.04-0.15mm, which belongs to the category of micro-grain intercalation; the grain size of hematite is very small, mostly between 0.002-0.010mm, which belongs to the category of extremely fine grain intercalation . Specific steps are as follows:

[0052] A) Use a horizontal long tube ball mill to grind -15mm raw ore with an iron grade of 28% in the first and second stages of continuous ball milling, and add 500% of dispersant water glass to the second stage of the ball mill. 1000g / t, the fineness of the overflow pulp obtained after the second-stage grinding machine is classified by the cyclone is -200 mesh, accounting for 95%, and...

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Abstract

The invention provides a beneficiation method for mixed magnetite and hematite. The method comprises the steps of a, performing first section ore grinding and second section ore grinding on the mixed magnetite and hematite to obtain ore pulp; b, grading the ore pulp, and performing first fluctuation and desliming on the obtained overflowing ore pulp to obtain slurry and setting sand; c, grading the setting sand, performing third section ore grinding, and performing second fluctuation and desliming on graded ore pulp obtained by ore grinding from the third section ore grinding to obtain slurry and setting sand; and d, performing reverse flotation on the setting sand obtained from the step c. The beneficiation method for the mixed magnetite and hematite is adopted to process the mixed magnetite and hematite with fine particles, so the higher recovery rate and the higher grade of the iron ore concentrate are realized.

Description

technical field [0001] The invention relates to the technical field of beneficiation, in particular to a beneficiation method of maghemite. Background technique [0002] Mineral resources are an important material basis for ensuring the sustainable development of the national economy and society. Iron ore resources are one of the most important strategic resources in my country and the lifeblood of the iron and steel industry. The main characteristics of my country's iron ore are "poor", "fine" and "miscellaneous", the average iron grade is low, and the proportion of complex and difficult-to-select iron ore resources is large, of which 97% iron ore has an iron content below 30%. Mineral processing is required. The Qidong Iron Mine with an iron ore reserve of 510 million tons and the Dongkou Iron Mine with a reserve of 500 to 600 million tons in Hunan Province have an iron content of only 25 to 30%, and the iron minerals are extremely finely distributed. Hematite needs to be...

Claims

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Application Information

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IPC IPC(8): B03B7/00B03B1/00B03B1/04B03D3/06B03C1/02
Inventor 陈雯严小虎唐雪峰
Owner CHANGSHA RES INST OF MINING & METALLURGY
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