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Method for recovering iron concentrate from blast furnace dust

A technology for blast furnace dust and iron recovery, applied in chemical instruments and methods, improvement of process efficiency, magnetic separation, etc., can solve the problems of small processing capacity, large water consumption, large floor area, etc., to improve the grade of iron metal, The effect of solving pollution and reducing the content of harmful element zinc

Inactive Publication Date: 2005-07-06
宝钢集团上海梅山有限公司
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  • Description
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  • Application Information

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Problems solved by technology

This method has the disadvantages of complex process flow, small processing capacity, large water consumption, large floor area, and many factors affecting operation.

Method used

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  • Method for recovering iron concentrate from blast furnace dust

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Effect test

Embodiment 1

[0013] Embodiment 1: referring to accompanying drawing, what the present invention is implemented is the dust of Meishan blast furnace, and its TFe is about 42%, Zn3.0%, Cl4%; Wherein strong magnetic mineral 25%, weak magnetic mineral about 50%, its The specific recycling process is as follows: (1) Pour the blast furnace dust with a moisture content of less than 10% into a mixing bucket, add water and stir for 15-20 minutes to make a 17% weight concentration slurry, and put it into a ￠300×200mm wet cylinder permanent magnet weak The magnetic separator 2 is selected, and the magnetic field strength is 80KA / m, and the strong magnetic minerals are first selected;

[0014] (2) The weak magnetic tailings enter the ￠300×200mm permanent magnetic drum type strong magnetic separator 3 for rough separation, and then use the ￠300×200mm permanent magnetic drum type strong magnetic separator 4 for rough separation of the tailings , to further reduce the grade of tailings; the magnetic fiel...

Embodiment 2

[0018] Embodiment 2: the magnetic separation intensity of the wet drum type permanent magnetic weak magnetic separator 2 is 90KA / m, the strong magnetic roughing magnetic field intensity is 610KA / m, and the sweeping magnetic field intensity is 770KA / m; all the other are identical with embodiment 1. After treatment by technological methods, the iron content of the iron concentrate increased from 42% to 54%, an increase of 12 percentage points; the zinc content of the iron concentrate dropped from 3.21% to 2.49%, a decrease of 0.9 percentage points, and the recovery rate of iron metal 76%.

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Abstract

This invention relates to a method to recycle the concentration iron from blast furnace dust, which comprises the following steps: first processing weak magnetic selection on the dust and then strong magnetic selection on gangue and then again strong magnetic selection for all gangue according to their quality; merging the weak and two strong magnetic selections as integration concentration iron for recycle use. This invention can reasonable make use of the gangue without waste and the two condensers and two filters overflow achieve the drainage standard for recycle use or drainage.

Description

1. Technical field [0001] The invention relates to a method for recovering iron-containing dust, in particular to a method for recovering iron concentrate from blast furnace dust. 2. Background technology [0002] Blast furnace dust is the by-product of blast furnace production, that is, the soot of blast furnace gas. The coarse particles removed by the gravity dust collector in the purification project are gas ash, and the fine particles adsorbed by the water spray in the venturi tube are gas mud. The two are collectively referred to as Blast furnace dust. [0003] The main components of blast furnace dust are iron powder, coke powder and coal powder. There are also elements harmful to products such as lead and zinc in blast furnace dust of some enterprises. When the lead and zinc elements or contents are very low, the recovered dust can be directly mixed into the sintering raw materials for use; if the content of lead and zinc is relatively high, it can be mixed into the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03C1/00C22B1/00
CPCY02P10/20
Inventor 于留春宣守蓉周玲
Owner 宝钢集团上海梅山有限公司
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