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Method for purification of iron ores in deep ore body

A purification method and iron ore technology, applied in chemical instruments and methods, solid separation, wet separation, etc., can solve problems such as uneven particle size distribution of hematite, low content of muddy minerals, rare research reports, etc., to achieve The effect of comprehensive utilization is good, the recovery rate is improved, and the environmental pollution is small.

Active Publication Date: 2014-07-23
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The particle size distribution of hematite is uneven, ranging from 0.02 to 1mm, but there are very few hematites larger than 0.5mm, most of the hematite particle size is less than 0.1mm, and the magnetite particle size is generally below 0.1mm. Concentrated between 0.02~0.05mm; the content of muddy minerals in the ore is extremely low, which is quite different from the characteristics of most iron ores currently mined and utilized in China
[0005] Regarding the research on mineral processing technology of iron ore in deep ore bodies, since there is no application precedent in the past, and there is no production and application practice in China, the research reports are rare

Method used

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  • Method for purification of iron ores in deep ore body

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Comparison scheme
Effect test

Embodiment 1

[0030] The deep ore body iron ore is crushed to a particle size of 2~15mm; then the part that is ground to -0.043mm accounts for 70% of the total weight to obtain primary fine ore; the iron grade of the deep ore body iron ore is 25 %, SiO 2 The weight content is 50%;

[0031] Add water to the primary fine ore to make a primary slurry with a weight concentration of 30%, and then perform a magnetic separation under the condition of a magnetic field strength of 1000 Oersted to obtain a magnetic separation concentrate and a magnetic separation tailings. The iron grade is 55%; the iron grade of the primary magnetic separation tailings is 25%;

[0032] Concentrate the primary magnetic separation tailings to a weight concentration of 30% ， Then carry out secondary magnetic separation under the condition of 4000 Oersted to obtain secondary magnetic separation concentrate and secondary magnetic separation tailings, the iron grade of secondary magnetic separation concentrate is 30%; ...

Embodiment 2

[0040] Purification method is with embodiment 1, and difference is:

[0041] The iron grade of iron ore in the deep ore body is 30%, SiO 2 The weight content is 48%; the part of -0.043mm in the primary powder ore after grinding accounts for 75% of the total weight;

[0042] Add water to the primary fine ore to make a primary slurry with a weight concentration of 35%, and then conduct a magnetic separation under the condition of a magnetic field strength of 2000 Oersted. The iron grade of the primary magnetic separation concentrate obtained is 58%; the primary magnetic separation tailings The iron grade is 22%;

[0043]Concentrate the primary magnetic separation tailings to a weight concentration of 35% ， Then carry out secondary magnetic separation under the condition of 5000 Oersted, the iron grade of the obtained secondary magnetic separation concentrate is 33%;

[0044] The part of -0.043mm in the secondary powder ore after grinding accounts for 80% of the total weight; ...

Embodiment 3

[0051] Purification method is with embodiment 1, and difference is:

[0052] The iron grade of iron ore in the deep ore body is 35%, SiO 2 The weight content is 46%; the part of -0.043mm in the primary powder ore after grinding accounts for 80% of the total weight;

[0053] Add water to the primary fine ore to make a primary slurry with a weight concentration of 40%, and then conduct a magnetic separation under the condition of a magnetic field strength of 1500 Oersted, and the iron grade of the obtained primary magnetic separation concentrate is 61%; the primary magnetic separation tailings The iron grade is 21%;

[0054] Concentrate the primary magnetic separation tailings to a weight concentration of 40% ， Then carry out secondary magnetic separation under the condition of 6000 Oersted, the iron grade of the obtained secondary magnetic separation concentrate is 38%;

[0055] The part of -0.043mm in the secondary powder ore after grinding accounts for 85% of the total wei...

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Abstract

The invention provides a method for purification of iron ores in a deep ore body and belongs to the technical field of mining. The method includes the first step of crushing and grinding the iron ores in the deep ore body to obtain primary fine ores, the second step of adding water into the primary fine ores to make primary ore pulp, and carrying out primary magnetic separation at the magnetic field intensity ranging from 1000 oersteds to 2000 oersteds to obtain primary magnetic concentrate and primary magnetic tailings, the third step of carrying out secondary magnetic separation after the primary magnetic tailings are concentrated to obtain secondary magnetic concentrate and the secondary magnetic tailings, the fourth step of mixing the primary magnetic concentrate and secondary magnetic concentrate evenly to form mixed magnetic concentrate and then carrying out ore grinding to obtain secondary fine ores, the fifth step of adding water into the secondary fine ores to form secondary ore pulp, regulating the PH value, adding causticized starch water solution and then adding lime and RA715 to form reverse flotation feed, and the sixth step of carrying out reverse floatation roughing separation on the reverse flotation feed and carrying out reverse flotation concentration on roughing concentrate to obtain cleaner concentrate and cleaner tailings. Through the method, the recovery rate of iron is substantially increased; the method has the advantages of being low in comprehensive cost, small in environmental pollution, good in comprehensive utilization effect and the like.

Description

technical field [0001] The invention belongs to the technical field of mining, in particular to a method for purifying iron ore in deep ore bodies. Background technique [0002] Deep orebodies refer to orebodies whose burial depth reaches 1000 meters. The deep ore bodies in the Benxi area of ​​Liaoning are located in the Anshan-Benxi iron ore metallogenic belt, which is an important iron ore metallogenic belt in China. [0003] After technological mineralogy research, it is found that the ore is hematite quartzite; the metal minerals are mainly hematite and magnetite, and the gangue minerals are mainly quartz, dolomite and biotite. Typical granite rocks Hematite mainly occurs in euhedral and semi-euhedral grains in gangue minerals such as quartz and dolomite, and its aggregates often form banded and dense massive structures. Magnetite is often wrapped in hematite, showing a metasomatic residual structure. Since both magnetite and hematite are iron oxides with high iron gra...

Claims

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Application Information

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IPC IPC(8): B03B7/00
Inventor 韩跃新李艳军刘杰
Owner NORTHEASTERN UNIV
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