Wet magnetic separation process for recycling iron in iron-containing waste

A technology for recovering iron and wet magnetic separator, which is applied in the fields of magnetic separation, chemical instruments and methods, solid separation, etc., can solve the problems of small investment, low magnetic separation efficiency, and high metal iron content in steel tailings, and achieves a simple process. , the effect of high economic and environmental benefits

Active Publication Date: 2014-10-08
WUKUN STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the wet magnetic separation magnetic separation method is mature, has its own characteristics, and is widely used for small investment and quick results. In the actual application process, there are disadvantages of low magnetic separation efficiency and high metal iron content in steel tailings.

Method used

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  • Wet magnetic separation process for recycling iron in iron-containing waste

Examples

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Comparison scheme
Effect test

Embodiment 1

[0045] The desulfurization slag produced in the steelmaking process with a total iron grade of 40% is passed through a magnetic disk with a magnetic field strength of 1000mT, and the large iron block in the steel slag is selected, and the total iron grade of the selected large iron block reaches 95%; the large iron block will be selected The final tailings pass through a magnetic pulley with a magnetic field strength of 800mT to select the small iron nuggets, and the total iron grade of the selected small iron nuggets reaches 93%; the tailings after the small iron nuggets are selected are passed through double-layer sieves, The size of the upper sieve hole is 80mm, and the size of the lower sieve hole is 20mm. After screening, the material larger than 20mm is crushed by the crusher, and the crushed material is returned to the double-layer sieve for screening; the material smaller than 20mm enters the magnetic field. The 200mT magnetic pulley is used for magnetic separation; the...

Embodiment 2

[0047] Pass the casting slag with a total iron grade of 30% produced in the steelmaking process through a magnetic disk with a magnetic field strength of 1200mT, select large iron blocks in the steel slag, and select large iron blocks with a total iron grade of 93%; The tailings after the block are passed through a magnetic pulley with a magnetic field strength of 700mT to select the small iron blocks, and the total iron grade of the selected small iron blocks reaches 91%; the tailings after the small iron blocks are selected through double-layer sieves , the size of the upper sieve hole is 75mm, and the size of the lower sieve hole is 15mm. After screening, the material larger than 15mm is crushed by the crusher, and the crushed material is returned to the double-layer sieve for screening; the material smaller than 15mm enters the magnetic field strength Magnetic separation is carried out for a 300mT magnetic pulley; the magnetic material after passing through the 300mT magnet...

Embodiment 3

[0049] Pass the ditch iron with a total iron grade of 35% produced in the ironmaking process through a magnetic disk with a magnetic field strength of 1000mT, select a large iron block in the steel slag, and the selected large iron block has a total iron grade of 91%; the large iron block will be selected The final tailings pass through a magnetic pulley with a magnetic field strength of 600mT to select the small iron nuggets, and the total iron grade of the selected small iron nuggets reaches 90%; the tailings after the small iron nuggets are selected are passed through double-layer sieves, The size of the upper sieve hole is 85mm, and the size of the lower sieve hole is 15mm. After screening, the material larger than 85mm is crushed by the crusher, and the crushed material is returned to the double-layer sieve for screening; the material smaller than 15mm enters the magnetic field. The 400mT magnetic pulley is used for magnetic separation; the magnetic material after passing ...

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Abstract

The invention discloses a wet magnetic separation process for recycling iron in iron-containing waste. The wet magnetic separation process comprises the followings steps: magnetic disc magnetic separation, magnetic pulley magnetic separation, screening and grinding, magnetic pulley magnetic separation, ball-milling and screening, magnetic separation and screening, magnetic separation, helical classification, hydraulic classification, natural precipitation and filtering. Desulfurized slag and cast residue produced in steelmaking procedure or sow iron and slag iron produced in the ironmaking process are taken as raw materials, the total iron grade of the separated iron ore can achieve 90% and more, the total iron grade of washed iron shot and iron powder can achieve 60% and more, the total iron grade of the magnetically separated concentrate can achieve 55% and more, the total iron grade of the magnetic separation powder can achieve 40-50%, the total iron grade of tailings powder can achieve 15-20%, and the metal iron content is 0.5-0.8%, the tailings powder can be used as grinding raw material of cement admixture or concrete additive. The wet magnetic separation process is simple, the hydroelectric resource consumption is slow and the magnetic separation efficiency is high, and high economic benefit and environment benefit are realized.

Description

technical field [0001] The invention belongs to the technical field of resource recovery, and in particular relates to a wet magnetic separation process for recovering iron from iron-containing waste. Background technique [0002] Steel slag is an intermediate by-product produced in the steelmaking process. It mainly comes from the smelting process of converters, electric furnaces, and open hearth furnaces. In order to remove harmful elements, lime, dolomite and other slagging materials are added to the chemical reaction products. 10% to 20%, and contains 7% to 10% scrap steel. Since most steel slags have high alkalinity, poor fluidity, and contain harmful substances such as sulfur and phosphorus, long-term stacking and accumulation will pollute the environment. At present, about 100 million tons of steel slag is discharged every year in our country. If it is not properly disposed of, it will cause about 40 million tons of scrap steel resources to be wasted every year, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03C1/30
Inventor 何建松白荣林白保安王志雄屠建春杨家荣徐忠民业超张润根方丽华陆永军郭普堂段江涛彭定培邱兆莹余艳平李浩伟劳忠友王锡营舒聪伟李彦刘伟侯可为韩迎胡娟王学文张艳芬毛利强
Owner WUKUN STEEL
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