Process for extracting iron from comprehensive tailings of refractory iron ores

A technology for iron ore and tailings, which is applied in the field of iron extraction technology from comprehensive tailings of refractory iron ore, and can solve problems such as difficult iron extraction technology.

Active Publication Date: 2016-10-12
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a comprehensive iron extraction process for refractory iron ore tailings in the prior art which is difficult to deal with by conventional beneficiation methods

Method used

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  • Process for extracting iron from comprehensive tailings of refractory iron ores

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Take the comprehensive tailings of JISCO tailings dam east area. The comprehensive tailings are mixed tailings of refractory iron ore strong magnetic separation tailings, weak magnetic separation tailings and reverse flotation tailings in a mass ratio of 1:1:1. Comprehensive tailings iron grade 20.38%, FeO mass percentage 6.71%, SiO 2 Mass percentage composition 40.43%, carry out following treatment:

[0021] A. Carry out drying treatment to the comprehensive tailings, and use a spiral mixer to break up and mix the agglomerated comprehensive tailings, and the drying temperature is 200°C;

[0022] B. The above-mentioned integrated tailings after being broken up are magnetically separated with a dry-type weak magnetic separator to obtain magnetic tailings and non-magnetic tailings, and the magnetic field strength of magnetic separation is 1800 Oe;

[0023] C. The above-mentioned magnetic tailings are desiliconized and concentrated by particle size classification-weak mag...

Embodiment 2

[0026] Take the comprehensive tailings in the southern area of ​​the tailings dam of JISCO. The comprehensive tailings are mixed tailings of refractory iron ore strong magnetic separation tailings, weak magnetic separation tailings and reverse flotation tailings in a mass ratio of 1:1:1. The iron grade of the comprehensive tailings is 21.32%, the mass percentage of FeO is 6.84%, and the content of SiO 2 Mass percentage composition 39.45%, carry out following treatment:

[0027] A. Carry out drying treatment to the comprehensive tailings, and use the stirring blade of the spiral mixer to break up the agglomerated comprehensive tailings and mix them evenly, and the drying temperature is 200°C;

[0028] B. The above-mentioned integrated tailings after being dispersed are magnetically separated with a dry-type weak magnetic separator to obtain magnetic tailings and non-magnetic tailings, and the magnetic field strength of magnetic separation is 1900 Oe;

[0029] C. The above-ment...

Embodiment 3

[0032] Take the comprehensive tailings in the west area of ​​the tailings dam of JISCO. The comprehensive tailings are mixed tailings of refractory iron ore strong magnetic separation tailings, weak magnetic separation tailings and reverse flotation tailings in a mass ratio of 1:1:1. Comprehensive tailings iron grade 20.77%, FeO mass percentage 7.03%, SiO 2 Mass percentage composition 40.52%, carry out following treatment:

[0033] A. Carry out drying treatment to the comprehensive tailings, and use the stirring blade of the spiral mixer to break up the agglomerated comprehensive tailings and mix them evenly, and the drying temperature is 200°C;

[0034] B. The above-mentioned integrated tailings after being dispersed are magnetically separated with a dry-type weak magnetic separator to obtain magnetic tailings and non-magnetic tailings, and the magnetic field strength of magnetic separation is 2000 Oe;

[0035] C. The above-mentioned magnetic tailings are desiliconized and c...

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Abstract

A process for extracting iron from comprehensive tailings of refractory iron ores comprises the following main steps: after drying and scattering the comprehensive tailings of the refractory iron ores, magnetically separating the comprehensive tailings of the refractory iron ores by using a dry type low-intensity magnetic separation machine to obtain magnetic tailings and non-magnetic tailings; and carrying out size grading on the magnetic tailings to remove the magnetic tailings with low coarse fraction grade and high SiO2 content; carrying out three-stage low-intensity magnetic separation and desilicification to increase iron grade so as to obtain qualified iron ore concentrates; granulating and drying the non-magnetic tailings at first, and then mixing the non-magnetic tailings with a pulverized coal reducing agent; loading in a rotary kiln in a mixed manner and magnetically roasting, wherein roasting temperature is 700-850 DEG C and high-temperature roasting time is 30-50 min; after roasting is finished, cooling to the temperature below 100 DEG C by using an indirect water-cooling mode; and then carrying one-stage grinding and two-stage magnetic separation to obtain qualified iron core concentrates finally. Compared with the traditional tailings treatment method, the process is purposeful, the comprehensive tailings are classified according to different properties of the comprehensive tailings, the tailings treatment efficiency can be improved, so that useful resources are extracted to a maximum extent, and the tailings of the refractory iron ores are utilized comprehensively.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a process for extracting iron from comprehensive tailings of refractory iron ore. Background technique [0002] my country's iron ore resources are rich in lean ore and few in rich ore. Lean ore accounts for about 94.6% of the total reserves. Most of them have the characteristics of low raw ore grade, complex mineral composition, and fine particle size. Since the founding of the People's Republic of China, the rapid development of the metallurgical industry and the immature beneficiation technology have led to a large amount of mining of such refractory ores but low utilization rates, resulting in a large amount of tailings, which not only leads to waste of resources, but also has a huge impact on the environment. For example, the Jiuquan Iron and Steel Concentrator, since it was put into operation, the total amount of tailings discharged into the tailings ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03C1/30B03C1/015C22B1/212C22B1/216C22B1/24
CPCB03C1/015B03C1/30C22B1/212C22B1/216C22B1/2406
Inventor 郭忆王欣展仁礼寇明月李慧春边立国白江虎
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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