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A kind of fly ash pre-selected iron concentrate to improve grade and reduce sio 2 content method

A technology for improving grade and iron concentrate, applied in chemical instruments and methods, wet separation, solid separation, etc., can solve the problems of low grade of iron concentrate, high production cost, restricted promotion and application, etc. High iron recovery rate and the effect of improving iron grade

Active Publication Date: 2018-01-26
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

After wet magnetic separation of fly ash, low-iron fly ash with high water content is obtained, which greatly reduces the utilization range of fly ash. At the same time, the water treatment process of wet magnetic separation of fly ash is complicated and the production cost is high, which limits this. application of the method
The fly ash dry magnetic separation process has a short process, no water consumption, and low production costs. However, due to the fine particle size of the fly ash, the magnetic substances selected in the magnetic separation process often contain a certain amount of non-magnetic substances. , so that the grade of iron concentrate obtained by a dry magnetic separation is low, SiO 2 The content is relatively high, which cannot meet the production requirements of blast furnace smelting

Method used

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  • A kind of fly ash pre-selected iron concentrate to improve grade and reduce sio <sub>2</sub> content method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Take the boiler fly ash of the 42.5MW unit boiler of JISCO Hongsheng Thermal Power No. 2 Mass percentage composition 54.21%, carry out following treatment:

[0018] A: The fly ash produced by the thermal power plant is subjected to dry pre-selection treatment, the pre-selected magnetic field strength is 400mT, and the iron grade is 43.02%, SiO 2 Pre-selected iron ore concentrate with a mass percentage of 14.36%;

[0019] B: The above-mentioned pre-selected iron concentrate is divided into coarse and fine grades by a high-fineness grading cyclone. Only 19.14%, SiO 2 The mass percentage content is 27.45%, so it is excluded. The iron grade of the -400 mesh pre-selected iron concentrate is 50.12%, the iron distribution rate is 80.86%, and the SiO 2 The mass percentage is 11.56%, which is sent to the next link for weak magnetic selection;

[0020] C: The above -400 mesh fly ash pre-selected iron concentrate is subjected to weak magnetic concentration by two-stage magneti...

Embodiment 2

[0022] Take the boiler fly ash of the 2×300MW unit boiler of JISCO Hongsheng Thermal Power Plant No. 2 Mass percentage composition 46.23%, carry out following treatment:

[0023] A: The fly ash produced by the thermal power plant is subjected to dry pre-selection treatment, the pre-selected magnetic field strength is 400mT, and the iron grade is 44.21%, SiO 2 Pre-selected iron ore concentrate with a mass percentage of 13.86%;

[0024] B: The above-mentioned pre-selected iron concentrate is divided into coarse and fine grades by a high-fineness grading cyclone. Only 20.63%, SiO 2 The mass percentage content is 25.31%, so it is excluded. The iron grade of the -400 mesh pre-selected iron concentrate is 52.06%, the iron distribution rate is 79.37%, and the SiO 2 The mass percentage is 10.59%, which is sent to the next link for weak magnetic selection;

[0025] C: The above -300 mesh fly ash pre-selected iron concentrate is subjected to weak magnetic concentration by two-stage ...

Embodiment 3

[0027] Take the boiler fly ash of the 2×350MW unit boiler of JISCO Hongsheng Thermal Power Plant No. 2, the grade of the fly ash is 9.64% iron, SiO 2 Mass percentage composition 38.21%, carry out following treatment:

[0028] A: The fly ash produced by the thermal power plant is subjected to dry pre-selection treatment, the pre-selected magnetic field strength is 300 mT, and the iron grade is 46.32%, SiO 2 Pre-selected iron ore concentrate with a mass percentage of 13.07%;

[0029] B: The above-mentioned pre-selected iron concentrate is divided into coarse and fine grades by a high-fineness grading cyclone. The grade size is 300 mesh. Only 18.63%, SiO 2 The mass percentage content is 27.68%, so it is excluded. The iron grade of the -300 mesh size pre-selected iron concentrate is 53.44%, the iron distribution rate is 81.37%, and the SiO 2 The mass percentage is 10.48%, which is sent to the next link for weak magnetic selection;

[0030] C: The above -300 mesh fly ash pre-se...

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Abstract

The invention relates to a method for raising ore grade and reducing SiO2 content of a pre-concentrated iron ore concentrate made from a fly ash. The method comprises the following steps of obtaining the pre-concentrated iron ore concentrate from the fly ash produced in a thermal power plant through dry type pre-concentration; according to the characteristics of the pre-concentrated iron ore concentrate being high in fine fraction iron grade, high in iron distribution ratio and low in silicon content, classifying the pre-concentrated iron ore concentrate made from the fly ash into a coarse fraction and a fine fraction utilizing a high-fineness classifying cyclone or an electromagnetic vibrating undersize sieve, wherein the classification granularity is 200-400 meshes; rejecting coarse-fraction pre-concentrated iron ore concentrate with low iron grade and high silicon content; performing flux weakening concentration on the fine-fraction pre-concentrated iron ore concentrate through a two-stage magnetic separation technology, wherein the magnetic field intensity of the first-stage magnetic separation is 150-180mT, and the magnetic field intensity of the second-stage magnetic separation is 100-120mT; and finally obtaining the qualified iron ore concentrate of which the iron grade is 55% or below and the SiO2 content is lower than 8%, filtering the iron ore concentrate after the magnetic separation, and conveying the filtered iron ore concentrated into a concentrate warehouse. According to the method disclosed by the invention, the problems that the pre-concentrated iron ore concentrate made from the fly ash is low in grade, and high in silicon content are solved.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and relates to a fly ash pre-selected iron concentrate to improve grade and reduce SiO 2 content method. Background technique [0002] Fly ash is a solid waste emitted from coal-fired power plants. According to statistics, every ton of coal burned can produce 100-200kg of fly ash. Coal contains pyrite, marcasite, chalcopyrite, arsenite, siderite, gypsum and other minerals. During the combustion of coal, these minerals are decomposed and transformed by the high temperature of about 1450°C. The iron entering the fly ash mainly exists in the form of magnetite, hematite and iron silicate. The iron grade in the fly ash is generally It is 2 to 15%, and a simple magnetic separation method can be used for iron selection. [0003] The process of fly ash magnetic separation is divided into wet type and dry type. After wet magnetic separation of fly ash, low-iron fly ash with high water cont...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03B7/00
CPCB03B7/00
Inventor 展仁礼郭忆王欣边立国靳建毅邢德军寇明月白江虎
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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